harmony-v3.3.4

fixes #2689

.github/ISSUE_TEMPLATE.md

@@ -1,7 +1,11 @@
-**Bug report or feature request?**
+**Bug report or feature request?** 
 
 <!-- Note: sub-optimal but correct code is not a bug -->
 
+**ES5 or ES6+ input?** 
+
+<!-- Note: for ES6 see: https://github.com/mishoo/UglifyJS2/tree/harmony#harmony -->
+
 **Uglify version (`uglifyjs -V`)**
 
 **JavaScript input**
@@ -20,6 +24,6 @@
 **JavaScript output or error produced.**
 
 <!--
-    Note: `uglify-js` only supports JavaScript.
-    Those wishing to minify ES6+ should transpile first.
+    Note: `uglify-js` only supports ES5. 
+    Those wishing to minify ES6 should use `uglify-es`.
 -->

.github/workflows/ci.yml

@@ -1,48 +0,0 @@
-name: CI
-on:
-  pull_request:
-  push:
-    branches: [ master ]
-jobs:
-  test:
-    strategy:
-      matrix:
-        node: [ "0.8", "0.10", "0.12", "4", "6", "8", "10", "12", latest ]
-        os: [ ubuntu-latest, windows-latest ]
-        script: [ compress, mocha, release/benchmark, release/jetstream ]
-        exclude:
-          - node: "0.8"
-            script: release/benchmark
-          - node: "0.8"
-            script: release/jetstream
-    name: ${{ matrix.node }} ${{ matrix.os }} ${{ matrix.script }}
-    runs-on: ${{ matrix.os }}
-    env:
-      NODE: ${{ matrix.node }}
-      TYPE: ${{ matrix.script }}
-    steps:
-      - uses: actions/checkout@v2
-      - uses: actions/cache@v2
-        with:
-          path: tmp
-          key: tmp ${{ matrix.script }}
-      - name: Perform tests
-        shell: bash
-        run: |
-          git clone --branch v1.5.4 --depth 1 https://github.com/jasongin/nvs.git ~/.nvs
-          while ! timeout 60 bash -c '. ~/.nvs/nvs.sh add $NODE && nvs use $NODE'; do
-            cd ~/.nvs
-            while !(git clean -xdf); do echo "'git clean' failed - retrying..."; done
-            cd -
-          done
-          . ~/.nvs/nvs.sh --version
-          nvs use $NODE
-          node --version
-          npm config set audit false
-          npm config set optional false
-          npm config set save false
-          npm config set strict-ssl false
-          npm config set update-notifier false
-          npm --version
-          while !(npm install); do echo "'npm install' failed - retrying..."; done
-          node test/$TYPE

.github/workflows/ufuzz.yml

@@ -1,47 +0,0 @@
-name: Fuzzing
-on:
-  pull_request:
-  schedule:
-    - cron: "*/5 * * * *"
-env:
-  BASE_URL: https://api.github.com/repos/${{ github.repository }}
-  CAUSE: ${{ github.event_name }}
-  TOKEN: ${{ github.token }}
-jobs:
-  ufuzz:
-    strategy:
-      fail-fast: false
-      matrix:
-        os: [ ubuntu-latest, windows-latest ]
-    name: ${{ matrix.os }}
-    runs-on: ${{ matrix.os }}
-    steps:
-      - uses: actions/checkout@v2
-      - name: Perform fuzzing
-        shell: bash
-        run: |
-          git clone --branch v1.5.4 --depth 1 https://github.com/jasongin/nvs.git ~/.nvs
-          while ! timeout 60 bash -c '. ~/.nvs/nvs.sh add 8 && nvs use 8'; do
-            cd ~/.nvs
-            while !(git clean -xdf); do echo "'git clean' failed - retrying..."; done
-            cd -
-          done
-          . ~/.nvs/nvs.sh --version
-          nvs use 8
-          node --version
-          npm config set audit false
-          npm config set optional false
-          npm config set save false
-          npm config set strict-ssl false
-          npm config set update-notifier false
-          npm --version
-          while !(npm install); do echo "'npm install' failed - retrying..."; done
-          PERIOD=1800000
-          if [[ $CAUSE == "schedule" ]]; then
-            PERIOD=`node test/ufuzz/actions $BASE_URL $TOKEN`
-          fi
-          if (( $PERIOD == 0 )); then
-            echo "too many jobs in queue - skipping..."
-          else
-            node test/ufuzz/job $PERIOD
-          fi

.travis.yml

@@ -0,0 +1,14 @@
+language: node_js
+node_js:
+    - "0.10"
+    - "0.12"
+    - "4"
+    - "6"
+    - "8"
+env:
+    - UGLIFYJS_TEST_ALL=1
+matrix:
+  fast_finish: true
+sudo: false
+cache:
+  directories: tmp

CONTRIBUTING.md

@@ -1,61 +0,0 @@
-Contributing
-============
-
-## Documentation
-
-Every new feature and API change should be accompanied by a README additon.
-
-## Testing
-
-All features and bugs should have tests that verify the fix. You can run all
-tests using `npm test`.
-
-The most common type of test are tests that verify input and output of the
-Uglify transforms. These tests exist in `test/compress`. New tests can be added
-either to an existing file or in a new file `issue-xxx.js`.
-
-Tests that cannot be expressed as a simple AST can be found in `test/mocha`.
-
-## Code style
-
-- File encoding must be `UTF-8`.
-- `LF` is always used as a line ending.
-- Statements end with semicolons.
-- Indentation uses 4 spaces, switch `case` 2 spaces.
-- Identifiers use `snake_case`.
-- Strings use double quotes (`"`).
-- Use a trailing comma for multiline array and object literals to minimize diffs.
-- The Uglify code only uses ES5, even in the `harmony` branch.
-- Line length should be at most 80 cols, except when it is easier to read a
-  longer line.
-- If both sides of a comparison are of the same type, `==` and `!=` are used.
-- Multiline conditions place `&&` and `||` first on the line.
-
-**Example feature**
-
-```js
-OPT(AST_Debugger, function(self, compressor) {
-    if (compressor.option("drop_debugger"))
-        return make_node(AST_EmptyStatement, self);
-    return self;
-});
-```
-
-**Example test case**
-
-```js
-drop_debugger: {
-    options = {
-        drop_debugger: true,
-    }
-    input: {
-        debugger;
-        if (foo) debugger;
-    }
-    expect: {
-        if (foo);
-    }
-}
-```
-
-

LICENSE

@@ -1,6 +1,6 @@
 UglifyJS is released under the BSD license:
 
-Copyright 2012-2019 (c) Mihai Bazon <mihai.bazon@gmail.com>
+Copyright 2012-2013 (c) Mihai Bazon <mihai.bazon@gmail.com>
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions

README.md

@@ -1,13 +1,11 @@
-UglifyJS 3
-==========
+uglify-es
+=========
 
-UglifyJS is a JavaScript parser, minifier, compressor and beautifier toolkit.
+A JavaScript parser, mangler/compressor and beautifier toolkit for ES6+.
 
 #### Note:
-- **`uglify-js@3` has a simplified [API](#api-reference) and [CLI](#command-line-usage) that is not backwards compatible with [`uglify-js@2`](https://github.com/mishoo/UglifyJS/tree/v2.x)**.
-- **Documentation for UglifyJS `2.x` releases can be found [here](https://github.com/mishoo/UglifyJS/tree/v2.x)**.
-- `uglify-js` only supports JavaScript (ECMAScript 5).
-- To minify ECMAScript 2015 or above, transpile using tools like [Babel](https://babeljs.io/).
+- **`uglify-es` is API/CLI compatible with `uglify-js@3`.**
+- **`uglify-es` is not backwards compatible with `uglify-js@2`.**
 
 Install
 -------
@@ -17,11 +15,11 @@ First make sure you have installed the latest version of [node.js](http://nodejs
 
 From NPM for use as a command line app:
 
-    npm install uglify-js -g
+    npm install uglify-es -g
 
 From NPM for programmatic use:
 
-    npm install uglify-js
+    npm install uglify-es
 
 # Command line usage
 
@@ -69,7 +67,7 @@ a double dash to prevent input files being used as option arguments:
                                 `debug`  Add debug prefix and suffix.
                                 `domprops`  Mangle property names that overlaps
                                             with DOM properties.
-                                `keep_quoted`  Only mangle unquoted properties.
+                                `keep_quoted`  Only mangle unquoted properies.
                                 `regex`  Only mangle matched property names.
                                 `reserved`  List of names that should not be mangled.
     -b, --beautify [options]    Beautify output/specify output options:
@@ -87,7 +85,6 @@ a double dash to prevent input files being used as option arguments:
                                 `wrap_iife`  Wrap IIFEs in parenthesis. Note: you may
                                              want to disable `negate_iife` under
                                              compressor options.
-    -O, --output-opts [options] Specify output options (`beautify` disabled by default).
     -o, --output <file>         Output file path (default STDOUT). Specify `ast` or
                                 `spidermonkey` to write UglifyJS or SpiderMonkey AST
                                 as JSON to STDOUT respectively.
@@ -105,15 +102,20 @@ a double dash to prevent input files being used as option arguments:
                                 sequences.
     --config-file <file>        Read `minify()` options from JSON file.
     -d, --define <expr>[=value] Global definitions.
-    -e, --enclose [arg[:value]] Embed everything in a big function, with configurable
-                                argument(s) & value(s).
+    --ecma <version>            Specify ECMAScript release: 5, 6, 7 or 8.
     --ie8                       Support non-standard Internet Explorer 8.
                                 Equivalent to setting `ie8: true` in `minify()`
                                 for `compress`, `mangle` and `output` options.
                                 By default UglifyJS will not try to be IE-proof.
+    --keep-classnames           Do not mangle/drop class names.
     --keep-fnames               Do not mangle/drop function names.  Useful for
                                 code relying on Function.prototype.name.
     --name-cache <file>         File to hold mangled name mappings.
+    --safari10                  Support non-standard Safari 10/11.
+                                Equivalent to setting `safari10: true` in `minify()`
+                                for `mangle` and `output` options.
+                                By default `uglify-es` will not work around
+                                Safari 10/11 bugs.
     --self                      Build UglifyJS as a library (implies --wrap UglifyJS)
     --source-map [options]      Enable source map/specify source map options:
                                 `base`  Path to compute relative paths from input files.
@@ -121,12 +123,10 @@ a double dash to prevent input files being used as option arguments:
                                            JS that was generated from some other original
                                            code. Specify "inline" if the source map is
                                            included within the sources.
-                                `filename`  Filename and/or location of the output source
-                                            (sets `file` attribute in source map).
+                                `filename`  Name and/or location of the output source.
                                 `includeSources`  Pass this flag if you want to include
                                                   the content of source files in the
                                                   source map as sourcesContent property.
-                                `names` Include symbol names in the source map.
                                 `root`  Path to the original source to be included in
                                         the source map.
                                 `url`  If specified, path to the source map to append in
@@ -154,15 +154,10 @@ debugging your compressed JavaScript.  To get a source map, pass
 
 Additional options:
 
-- `--source-map "filename='<NAME>'"` to specify the name of the source map. The value of
-  `filename` is only used to set `file` attribute (see [the spec][sm-spec])
-  in source map file.
+- `--source-map "filename='<NAME>'"` to specify the name of the source map.
 
 - `--source-map "root='<URL>'"` to pass the URL where the original files can be found.
 
-- `--source-map "names=false"` to omit symbol names if you want to reduce size
-  of the source map file.
-
 - `--source-map "url='<URL>'"` to specify the URL where the source map can be found.
   Otherwise UglifyJS assumes HTTP `X-SourceMap` is being used and will omit the
   `//# sourceMappingURL=` directive.
@@ -212,16 +207,17 @@ Example:
 To enable the mangler you need to pass `--mangle` (`-m`).  The following
 (comma-separated) options are supported:
 
-- `eval` (default `false`) -- mangle names visible in scopes where `eval` or
-  `with` are used.
+- `toplevel` (default `false`) -- mangle names declared in the top level scope.
 
-- `reserved` (default: `[]`) -- when mangling is enabled but you want to
-  prevent certain names from being mangled, you can declare those names with
-  `--mangle reserved` — pass a comma-separated list of names.  For example:
+- `eval` (default `false`) -- mangle names visible in scopes where `eval` or `with` are used.
 
-      uglifyjs ... -m reserved=['$','require','exports']
+When mangling is enabled but you want to prevent certain names from being
+mangled, you can declare those names with `--mangle reserved` — pass a
+comma-separated list of names.  For example:
 
-  to prevent the `require`, `exports` and `$` names from being changed.
+    uglifyjs ... -m reserved=['$','require','exports']
+
+to prevent the `require`, `exports` and `$` names from being changed.
 
 ### CLI mangling property names (`--mangle-props`)
 
@@ -353,7 +349,7 @@ identify mistakes like writing mangled keys to storage.
 Assuming installation via NPM, you can load UglifyJS in your application
 like this:
 ```javascript
-var UglifyJS = require("uglify-js");
+var UglifyJS = require("uglify-es");
 ```
 
 There is a single high level function, **`minify(code, options)`**,
@@ -482,42 +478,54 @@ if (result.error) throw result.error;
 
 ## Minify options
 
+- `ecma` (default `undefined`) - pass `5`, `6`, `7` or `8` to override `parse`,
+  `compress` and `output` options.
+
+- `warnings` (default `false`) — pass `true` to return compressor warnings
+  in `result.warnings`. Use the value `"verbose"` for more detailed warnings.
+
+- `parse` (default `{}`) — pass an object if you wish to specify some
+  additional [parse options](#parse-options).
+
 - `compress` (default `{}`) — pass `false` to skip compressing entirely.
   Pass an object to specify custom [compress options](#compress-options).
 
-- `ie8` (default `false`) -- set to `true` to support IE8.
-
-- `keep_fnames` (default: `false`) -- pass `true` to prevent discarding or mangling
-  of function names.  Useful for code relying on `Function.prototype.name`.
-
 - `mangle` (default `true`) — pass `false` to skip mangling names, or pass
   an object to specify [mangle options](#mangle-options) (see below).
 
   - `mangle.properties` (default `false`) — a subcategory of the mangle option.
     Pass an object to specify custom [mangle property options](#mangle-properties-options).
 
-- `nameCache` (default `null`) -- pass an empty object `{}` or a previously
+- `output` (default `null`) — pass an object if you wish to specify
+  additional [output options](#output-options).  The defaults are optimized
+  for best compression.
+
+- `sourceMap` (default `false`) - pass an object if you wish to specify
+  [source map options](#source-map-options).
+
+- `toplevel` (default `false`) - set to `true` if you wish to enable top level
+  variable and function name mangling and to drop unused variables and functions.
+
+- `nameCache` (default `null`) - pass an empty object `{}` or a previously
   used `nameCache` object if you wish to cache mangled variable and
   property names across multiple invocations of `minify()`. Note: this is
   a read/write property. `minify()` will read the name cache state of this
   object and update it during minification so that it may be
   reused or externally persisted by the user.
 
-- `output` (default `null`) — pass an object if you wish to specify
-  additional [output options](#output-options).  The defaults are optimized
-  for best compression.
+- `ie8` (default `false`) - set to `true` to support IE8.
 
-- `parse` (default `{}`) — pass an object if you wish to specify some
-  additional [parse options](#parse-options).
+- `keep_classnames` (default: `undefined`) - pass `true` to prevent discarding or mangling
+  of class names.
 
-- `sourceMap` (default `false`) -- pass an object if you wish to specify
-  [source map options](#source-map-options).
+- `keep_fnames` (default: `false`) - pass `true` to prevent discarding or mangling
+  of function names.  Useful for code relying on `Function.prototype.name`. If the
+  top level minify option `keep_classnames` is `undefined` it will be overriden with
+  the value of the top level minify option `keep_fnames`.
 
-- `toplevel` (default `false`) -- set to `true` if you wish to enable top level
-  variable and function name mangling and to drop unused variables and functions.
-
-- `warnings` (default `false`) — pass `true` to return compressor warnings
-  in `result.warnings`. Use the value `"verbose"` for more detailed warnings.
+- `safari10` (default: `false`) - pass `true` to work around Safari 10/11 bugs in
+  loop scoping and `await`. See `safari10` options in [`mangle`](#mangle-options)
+  and [`output`](#output-options) for details.
 
 ## Minify options structure
 
@@ -542,9 +550,13 @@ if (result.error) throw result.error;
     sourceMap: {
         // source map options
     },
-    nameCache: null, // or specify a name cache object
-    toplevel: false,
+    ecma: 5, // specify one of: 5, 6, 7 or 8
+    keep_classnames: false,
+    keep_fnames: false,
     ie8: false,
+    nameCache: null, // or specify a name cache object
+    safari10: false,
+    toplevel: false,
     warnings: false,
 }
 ```
@@ -596,23 +608,24 @@ var result = UglifyJS.minify({"compiled.js": "compiled code"}, {
 
 If you're using the `X-SourceMap` header instead, you can just omit `sourceMap.url`.
 
-If you wish to reduce file size of the source map, set option `sourceMap.names`
-to be `false` and all symbol names will be omitted.
-
 ## Parse options
 
 - `bare_returns` (default `false`) -- support top level `return` statements
 
+- `ecma` (default: `8`) -- specify one of `5`, `6`, `7` or `8`. Note: this setting
+  is not presently enforced except for ES8 optional trailing commas in function
+  parameter lists and calls with `ecma` `8`.
+
 - `html5_comments` (default `true`)
 
 - `shebang` (default `true`) -- support `#!command` as the first line
 
 ## Compress options
 
-- `arguments` (default: `true`) -- replace `arguments[index]` with function
-  parameter name whenever possible.
-
-- `assignments` (default: `true`) -- apply optimizations to assignment expressions.
+- `arrows` (default: `true`) -- Converts `()=>{return x}` to `()=>x`. Class
+  and object literal methods will also be converted to arrow expressions if
+  the resultant code is shorter: `m(){return x}` becomes `m:()=>x`.
+  This transform requires that the `ecma` compress option is set to `6` or greater.
 
 - `booleans` (default: `true`) -- various optimizations for boolean context,
   for example `!!a ? b : c → a ? b : c`
@@ -621,16 +634,17 @@ to be `false` and all symbol names will be omitted.
   side effects permitting.
 
 - `comparisons` (default: `true`) -- apply certain optimizations to binary nodes,
-  e.g. `!(a <= b) → a > b`, attempts to negate binary nodes, e.g.
-  `a = !b && !c && !d && !e → a=!(b||c||d||e)` etc.
+  e.g. `!(a <= b) → a > b` (only when `unsafe_comps`), attempts to negate binary
+  nodes, e.g. `a = !b && !c && !d && !e → a=!(b||c||d||e)` etc.
+
+- `computed_props` (default: `true`) -- Transforms constant computed properties
+  into regular ones: `{["computed"]: 1}` is converted to `{computed: 1}`.
 
 - `conditionals` (default: `true`) -- apply optimizations for `if`-s and conditional
   expressions
 
 - `dead_code` (default: `true`) -- remove unreachable code
 
-- `directives` (default: `true`) -- remove redundant or non-standard directives
-
 - `drop_console` (default: `false`) -- Pass `true` to discard calls to
   `console.*` functions. If you wish to drop a specific function call
   such as `console.info` and/or retain side effects from function arguments
@@ -638,17 +652,14 @@ to be `false` and all symbol names will be omitted.
 
 - `drop_debugger` (default: `true`) -- remove `debugger;` statements
 
-- `evaluate` (default: `true`) -- Evaluate expression for shorter constant
-  representation. Pass `"eager"` to always replace function calls whenever
-  possible, or a positive integer to specify an upper bound for each individual
-  evaluation in number of characters.
+- `ecma` (default: `5`) -- Pass `6` or greater to enable `compress` options that
+  will transform ES5 code into smaller ES6+ equivalent forms.
+
+- `evaluate` (default: `true`) -- attempt to evaluate constant expressions
 
 - `expression` (default: `false`) -- Pass `true` to preserve completion values
   from terminal statements without `return`, e.g. in bookmarklets.
 
-- `functions` (default: `true`) -- convert declarations from `var`to `function`
-  whenever possible.
-
 - `global_defs` (default: `{}`) -- see [conditional compilation](#conditional-compilation)
 
 - `hoist_funs` (default: `false`) -- hoist function declarations
@@ -656,31 +667,28 @@ to be `false` and all symbol names will be omitted.
 - `hoist_props` (default: `true`) -- hoist properties from constant object and
   array literals into regular variables subject to a set of constraints. For example:
   `var o={p:1, q:2}; f(o.p, o.q);` is converted to `f(1, 2);`. Note: `hoist_props`
-  works best with `toplevel` and `mangle` enabled, alongside with `compress` option
-  `passes` set to `2` or higher.
+  works best with `mangle` enabled, the `compress` option `passes` set to `2` or higher,
+  and the `compress` option `toplevel` enabled.
 
 - `hoist_vars` (default: `false`) -- hoist `var` declarations (this is `false`
   by default because it seems to increase the size of the output in general)
 
 - `if_return` (default: `true`) -- optimizations for if/return and if/continue
 
-- `inline` (default: `true`) -- inline calls to function with simple/`return` statement:
-  - `false` -- same as `0`
-  - `0` -- disabled inlining
-  - `1` -- inline simple functions
-  - `2` -- inline functions with arguments
-  - `3` -- inline functions with arguments and variables
-  - `true` -- same as `3`
+- `inline` (default: `true`) -- embed simple functions
 
 - `join_vars` (default: `true`) -- join consecutive `var` statements
 
-- `keep_fargs` (default: `strict`) -- Discard unused function arguments. Code
-  which relies on `Function.length` will break if this is done indiscriminately,
-  i.e. when passing `true`. Pass `false` to always retain function arguments.
+- `keep_classnames` (default: `false`) -- Pass `true` to prevent the
+  compressor from discarding class names.  See also: the `keep_classnames`
+  [mangle option](#mangle).
+
+- `keep_fargs` (default: `true`) -- Prevents the compressor from discarding unused
+  function arguments.  You need this for code which relies on `Function.length`.
 
 - `keep_fnames` (default: `false`) -- Pass `true` to prevent the
   compressor from discarding function names.  Useful for code relying on
-  `Function.prototype.name`. See also: the `keep_fnames` [mangle option](#mangle-options).
+  `Function.prototype.name`. See also: the `keep_fnames` [mangle option](#mangle).
 
 - `keep_infinity` (default: `false`) -- Pass `true` to prevent `Infinity` from
   being compressed into `1/0`, which may cause performance issues on Chrome.
@@ -692,8 +700,6 @@ to be `false` and all symbol names will be omitted.
   where the return value is discarded, to avoid the parens that the
   code generator would insert.
 
-- `objects` (default: `true`) -- compact duplicate keys in object literals.
-
 - `passes` (default: `1`) -- The maximum number of times to run compress.
   In some cases more than one pass leads to further compressed code.  Keep in
   mind more passes will take more time.
@@ -710,8 +716,7 @@ to be `false` and all symbol names will be omitted.
   pass `pure_funcs: [ 'Math.floor' ]` to let it know that this
   function won't produce any side effect, in which case the whole
   statement would get discarded.  The current implementation adds some
-  overhead (compression will be slower). Make sure symbols under `pure_funcs`
-  are also under `mangle.reserved` to avoid mangling.
+  overhead (compression will be slower).
 
 - `pure_getters` (default: `"strict"`) -- If you pass `true` for
   this, UglifyJS will assume that object property access
@@ -742,8 +747,6 @@ to be `false` and all symbol names will be omitted.
   annotation `/*@__PURE__*/` or `/*#__PURE__*/` immediately precedes the call. For
   example: `/*@__PURE__*/foo();`
 
-- `strings` (default: `true`) -- compact string concatenations.
-
 - `switches` (default: `true`) -- de-duplicate and remove unreachable `switch` branches
 
 - `toplevel` (default: `false`) -- drop unreferenced functions (`"funcs"`) and/or
@@ -760,33 +763,52 @@ to be `false` and all symbol names will be omitted.
 
 - `unsafe` (default: `false`) -- apply "unsafe" transformations (discussion below)
 
-- `unsafe_comps` (default: `false`) -- compress expressions like `a <= b` assuming
-  none of the operands can be (coerced to) `NaN`.
+- `unsafe_arrows` (default: `false`) -- Convert ES5 style anonymous function
+  expressions to arrow functions if the function body does not reference `this`.
+  Note: it is not always safe to perform this conversion if code relies on the
+  the function having a `prototype`, which arrow functions lack.
+  This transform requires that the `ecma` compress option is set to `6` or greater.
 
-- `unsafe_Function` (default: `false`) -- compress and mangle `Function(args, code)`
+- `unsafe_comps` (default: `false`) -- Reverse `<` and `<=` to `>` and `>=` to
+  allow improved compression. This might be unsafe when an at least one of two
+  operands is an object with computed values due the use of methods like `get`,
+  or `valueOf`. This could cause change in execution order after operands in the
+  comparison are switching. Compression only works if both `comparisons` and
+  `unsafe_comps` are both set to true.
+
+- `unsafe_Func` (default: `false`) -- compress and mangle `Function(args, code)`
   when both `args` and `code` are string literals.
 
 - `unsafe_math` (default: `false`) -- optimize numerical expressions like
   `2 * x * 3` into `6 * x`, which may give imprecise floating point results.
 
+- `unsafe_methods` (default: false) -- Converts `{ m: function(){} }` to
+  `{ m(){} }`. `ecma` must be set to `6` or greater to enable this transform.
+  If `unsafe_methods` is a RegExp then key/value pairs with keys matching the
+  RegExp will be converted to concise methods.
+  Note: if enabled there is a risk of getting a "`<method name>` is not a
+  constructor" TypeError should any code try to `new` the former function.
+
 - `unsafe_proto` (default: `false`) -- optimize expressions like
   `Array.prototype.slice.call(a)` into `[].slice.call(a)`
 
 - `unsafe_regexp` (default: `false`) -- enable substitutions of variables with
   `RegExp` values the same way as if they are constants.
 
-- `unsafe_undefined` (default: `false`) -- substitute `void 0` if there is a
-  variable named `undefined` in scope (variable name will be mangled, typically
-  reduced to a single character)
-
 - `unused` (default: `true`) -- drop unreferenced functions and variables (simple
   direct variable assignments do not count as references unless set to `"keep_assign"`)
 
+- `warnings` (default: `false`) -- display warnings when dropping unreachable
+  code or unused declarations etc.
+
 ## Mangle options
 
 - `eval` (default `false`) -- Pass `true` to mangle names visible in scopes
   where `eval` or `with` are used.
 
+- `keep_classnames` (default `false`) -- Pass `true` to not mangle class names.
+  See also: the `keep_classnames` [compress option](#compress-options).
+
 - `keep_fnames` (default `false`) -- Pass `true` to not mangle function names.
   Useful for code relying on `Function.prototype.name`. See also: the `keep_fnames`
   [compress option](#compress-options).
@@ -797,6 +819,11 @@ to be `false` and all symbol names will be omitted.
 - `toplevel` (default `false`) -- Pass `true` to mangle names declared in the
   top level scope.
 
+- `safari10` (default `false`) -- Pass `true` to work around the Safari 10 loop
+  iterator [bug](https://bugs.webkit.org/show_bug.cgi?id=171041)
+  "Cannot declare a let variable twice".
+  See also: the `safari10` [output option](#output-options).
+
 Examples:
 
 ```javascript
@@ -849,26 +876,27 @@ can pass additional arguments that control the code output:
   when you want to generate minified code, in order to specify additional
   arguments, so you can use `-b beautify=false` to override it.
 
-- `braces` (default `false`) -- always insert braces in `if`, `for`,
+- `bracketize` (default `false`) -- always insert brackets in `if`, `for`,
   `do`, `while` or `with` statements, even if their body is a single
   statement.
 
 - `comments` (default `false`) -- pass `true` or `"all"` to preserve all
-  comments, `"some"` to preserve multi-line comments that contain `@cc_on`,
-  `@license`, or `@preserve` (case-insensitive), a regular expression string
-  (e.g. `/^!/`), or a function which returns `boolean`, e.g.
-  ```js
-  function(node, comment) {
-      return comment.value.indexOf("@type " + node.TYPE) >= 0;
-  }
-  ```
+  comments, `"some"` to preserve some comments, a regular expression string
+  (e.g. `/^!/`) or a function.
+
+- `ecma` (default `5`) -- set output printing mode. Set `ecma` to `6` or
+  greater to emit shorthand object properties - i.e.: `{a}` instead of `{a: a}`.
+  The `ecma` option will only change the output in direct control of the
+  beautifier. Non-compatible features in the abstract syntax tree will still
+  be output as is. For example: an `ecma` setting of `5` will **not** convert
+  ES6+ code to ES5.
 
 - `indent_level` (default `4`)
 
 - `indent_start` (default `0`) -- prefix all lines by that many spaces
 
-- `inline_script` (default `true`) -- escape HTML comments and the slash in
-  occurrences of `</script>` in strings
+- `inline_script` (default `false`) -- escape the slash in occurrences of
+  `</script` in strings
 
 - `keep_quoted_props` (default `false`) -- when turned on, prevents stripping
   quotes from property names in object literals.
@@ -880,8 +908,8 @@ can pass additional arguments that control the code output:
   adjust for this text.  Can be used to insert a comment containing
   licensing information, for example.
 
-- `preserve_line` (default `false`) -- pass `true` to retain line numbering on
-  a best effort basis.
+- `preserve_line` (default `false`) -- pass `true` to preserve lines, but it
+  only works if `beautify` is set to `false`.
 
 - `quote_keys` (default `false`) -- pass `true` to quote all keys in literal
   objects
@@ -894,6 +922,10 @@ can pass additional arguments that control the code output:
   - `2` -- always use double quotes
   - `3` -- always use the original quotes
 
+- `safari10` (default `false`) -- set this option to `true` to work around
+  the [Safari 10/11 await bug](https://bugs.webkit.org/show_bug.cgi?id=176685).
+  See also: the `safari10` [mangle option](#mangle-options).
+
 - `semicolons` (default `true`) -- separate statements with semicolons.  If
   you pass `false` then whenever possible we will use a newline instead of a
   semicolon, leading to more readable output of uglified code (size before
@@ -912,7 +944,7 @@ can pass additional arguments that control the code output:
 
 - `wrap_iife` (default `false`) -- pass `true` to wrap immediately invoked
   function expressions. See
-  [#640](https://github.com/mishoo/UglifyJS/issues/640) for more details.
+  [#640](https://github.com/mishoo/UglifyJS2/issues/640) for more details.
 
 # Miscellaneous
 
@@ -955,6 +987,9 @@ when this flag is on:
 - `new Object()` → `{}`
 - `String(exp)` or `exp.toString()` → `"" + exp`
 - `new Object/RegExp/Function/Error/Array (...)` → we discard the `new`
+- `void 0` → `undefined` (if there is a variable named "undefined" in
+  scope; we do it because the variable name will be mangled, typically
+  reduced to a single character)
 
 ### Conditional compilation
 
@@ -1071,9 +1106,8 @@ var result = UglifyJS.minify(ast, {
 ### Working with Uglify AST
 
 Transversal and transformation of the native AST can be performed through
-[`TreeWalker`](https://github.com/mishoo/UglifyJS/blob/master/lib/ast.js) and
-[`TreeTransformer`](https://github.com/mishoo/UglifyJS/blob/master/lib/transform.js)
-respectively.
+[`TreeWalker`](http://lisperator.net/uglifyjs/walk) and
+[`TreeTransformer`](http://lisperator.net/uglifyjs/transform) respectively.
 
 ### ESTree / SpiderMonkey AST
 
@@ -1132,43 +1166,3 @@ To enable fast minify mode with the API use:
 ```js
 UglifyJS.minify(code, { compress: false, mangle: true });
 ```
-
-#### Source maps and debugging
-
-Various `compress` transforms that simplify, rearrange, inline and remove code
-are known to have an adverse effect on debugging with source maps. This is
-expected as code is optimized and mappings are often simply not possible as
-some code no longer exists. For highest fidelity in source map debugging
-disable the Uglify `compress` option and just use `mangle`.
-
-### Compiler assumptions
-
-To allow for better optimizations, the compiler makes various assumptions:
-
-- `.toString()` and `.valueOf()` don't have side effects, and for built-in
-  objects they have not been overridden.
-- `undefined`, `NaN` and `Infinity` have not been externally redefined.
-- `arguments.callee`, `arguments.caller` and `Function.prototype.caller` are not used.
-- The code doesn't expect the contents of `Function.prototype.toString()` or
-  `Error.prototype.stack` to be anything in particular.
-- Getting and setting properties on a plain object does not cause other side effects
-  (using `.watch()` or `Proxy`).
-- Object properties can be added, removed and modified (not prevented with
-  `Object.defineProperty()`, `Object.defineProperties()`, `Object.freeze()`,
-  `Object.preventExtensions()` or `Object.seal()`).
-- When `toplevel` is enabled, UglifyJS effectively assumes input code is wrapped
-  within `function(){ ... }`, thus forbids aliasing of declared global variables:
-  ```js
-  A = "FAIL";
-  var B = "FAIL";
-  // can be `global`, `self`, `window` etc.
-  var top = function() {
-      return this;
-  }();
-  // "PASS"
-  top.A = "PASS";
-  console.log(A);
-  // "FAIL" after compress and/or mangle
-  top.B = "PASS";
-  console.log(B);
-  ```

appveyor.yml

@@ -0,0 +1,24 @@
+environment:
+  matrix:
+  - nodejs_version: "0.10"
+  - nodejs_version: "0.12"
+  - nodejs_version: "4.0"
+  - nodejs_version: "6.0"
+
+matrix:
+  fast_finish: true
+
+platform:
+  - x86
+  - x64
+
+install:
+  - ps: Install-Product node $env:nodejs_version $env:platform
+  - npm install
+
+test_script:
+  - node --version
+  - npm --version
+  - npm test
+
+build: off

bin/uglifyjs

@@ -3,257 +3,167 @@
 
 "use strict";
 
-require("../tools/exit");
+// workaround for tty output truncation upon process.exit()
+[process.stdout, process.stderr].forEach(function(stream){
+    if (stream._handle && stream._handle.setBlocking)
+        stream._handle.setBlocking(true);
+});
 
 var fs = require("fs");
 var info = require("../package.json");
 var path = require("path");
+var program = require("commander");
 var UglifyJS = require("../tools/node");
 
-var skip_keys = [ "cname", "inlined", "parent_scope", "scope", "uses_eval", "uses_with" ];
+var skip_keys = [ "cname", "enclosed", "inlined", "parent_scope", "scope", "thedef", "uses_eval", "uses_with" ];
 var files = {};
-var options = {};
-var short_forms = {
-    b: "beautify",
-    c: "compress",
-    d: "define",
-    e: "enclose",
-    h: "help",
-    m: "mangle",
-    o: "output",
-    O: "output-opts",
-    p: "parse",
-    v: "version",
-    V: "version",
+var options = {
+    compress: false,
+    mangle: false
 };
-var args = process.argv.slice(2);
-var paths = [];
-var output, nameCache;
-var specified = {};
-while (args.length) {
-    var arg = args.shift();
-    if (arg[0] != "-") {
-        paths.push(arg);
-    } else if (arg == "--") {
-        paths = paths.concat(args);
-        break;
-    } else if (arg[1] == "-") {
-        process_option(arg.slice(2));
-    } else [].forEach.call(arg.slice(1), function(letter, index, arg) {
-        if (!(letter in short_forms)) fatal("invalid option -" + letter);
-        process_option(short_forms[letter], index + 1 < arg.length);
-    });
-}
-
-function process_option(name, no_value) {
-    specified[name] = true;
-    switch (name) {
-      case "help":
-        switch (read_value()) {
-          case "ast":
-            print(UglifyJS.describe_ast());
-            break;
-          case "options":
-            var text = [];
-            var toplevels = [];
-            var padding = "";
-            var defaults = UglifyJS.default_options();
-            for (var name in defaults) {
-                var option = defaults[name];
-                if (option && typeof option == "object") {
-                    text.push("--" + ({
-                        output: "beautify",
-                        sourceMap: "source-map",
-                    }[name] || name) + " options:");
-                    text.push(format_object(option));
-                    text.push("");
-                } else {
-                    if (padding.length < name.length) padding = Array(name.length + 1).join(" ");
-                    toplevels.push([ {
-                        keep_fnames: "keep-fnames",
-                        nameCache: "name-cache",
-                    }[name] || name, option ]);
-                }
-            }
-            toplevels.forEach(function(tokens) {
-                text.push("--" + tokens[0] + padding.slice(tokens[0].length - 2) + tokens[1]);
-            });
-            print(text.join("\n"));
-            break;
-          default:
-            print([
-                "Usage: uglifyjs [files...] [options]",
-                "",
-                "Options:",
-                "  -h, --help                               Print usage information.",
-                "                                           `--help options` for details on available options.",
-                "  -v, -V, --version                        Print version number.",
-                "  -p, --parse <options>                    Specify parser options.",
-                "  -c, --compress [options]                 Enable compressor/specify compressor options.",
-                "  -m, --mangle [options]                   Mangle names/specify mangler options.",
-                "  --mangle-props [options]                 Mangle properties/specify mangler options.",
-                "  -b, --beautify [options]                 Beautify output/specify output options.",
-                "  -O, --output-opts <options>              Output options (beautify disabled).",
-                "  -o, --output <file>                      Output file (default STDOUT).",
-                "  --comments [filter]                      Preserve copyright comments in the output.",
-                "  --config-file <file>                     Read minify() options from JSON file.",
-                "  -d, --define <expr>[=value]              Global definitions.",
-                "  -e, --enclose [arg[,...][:value[,...]]]  Embed everything in a big function, with configurable argument(s) & value(s).",
-                "  --ie8                                    Support non-standard Internet Explorer 8.",
-                "  --keep-fnames                            Do not mangle/drop function names. Useful for code relying on Function.prototype.name.",
-                "  --name-cache <file>                      File to hold mangled name mappings.",
-                "  --rename                                 Force symbol expansion.",
-                "  --no-rename                              Disable symbol expansion.",
-                "  --self                                   Build UglifyJS as a library (implies --wrap UglifyJS)",
-                "  --source-map [options]                   Enable source map/specify source map options.",
-                "  --timings                                Display operations run time on STDERR.",
-                "  --toplevel                               Compress and/or mangle variables in toplevel scope.",
-                "  --validate                               Perform validation during AST manipulations.",
-                "  --verbose                                Print diagnostic messages.",
-                "  --warn                                   Print warning messages.",
-                "  --wrap <name>                            Embed everything as a function with “exports” corresponding to “name” globally.",
-                "  --reduce-test                            Reduce a standalone test case (assumes cloned repository).",
-            ].join("\n"));
-        }
-        process.exit();
-      case "version":
-        print(info.name + " " + info.version);
-        process.exit();
-      case "config-file":
-        var config = JSON.parse(read_file(read_value(true)));
-        if (config.mangle && config.mangle.properties && config.mangle.properties.regex) {
-            config.mangle.properties.regex = UglifyJS.parse(config.mangle.properties.regex, {
-                expression: true,
-            }).value;
-        }
-        for (var key in config) if (!(key in options)) options[key] = config[key];
-        break;
-      case "compress":
-      case "mangle":
-        options[name] = parse_js(read_value(), options[name]);
-        break;
-      case "source-map":
-        options.sourceMap = parse_js(read_value(), options.sourceMap);
-        break;
-      case "enclose":
-        options[name] = read_value();
-        break;
-      case "ie8":
-      case "timings":
-      case "toplevel":
-      case "validate":
-        options[name] = true;
-        break;
-      case "keep-fnames":
-        options.keep_fnames = true;
-        break;
-      case "wrap":
-        options[name] = read_value(true);
-        break;
-      case "verbose":
-        options.warnings = "verbose";
-        break;
-      case "warn":
-        if (!options.warnings) options.warnings = true;
-        break;
-      case "beautify":
-        options.output = parse_js(read_value(), options.output);
-        if (!("beautify" in options.output)) options.output.beautify = true;
-        break;
-      case "output-opts":
-        options.output = parse_js(read_value(true), options.output);
-        break;
-      case "comments":
-        if (typeof options.output != "object") options.output = {};
-        options.output.comments = read_value();
-        if (options.output.comments === true) options.output.comments = "some";
-        break;
-      case "define":
-        if (typeof options.compress != "object") options.compress = {};
-        options.compress.global_defs = parse_js(read_value(true), options.compress.global_defs, "define");
-        break;
-      case "mangle-props":
-        if (typeof options.mangle != "object") options.mangle = {};
-        options.mangle.properties = parse_js(read_value(), options.mangle.properties);
-        break;
-      case "name-cache":
-        nameCache = read_value(true);
-        options.nameCache = JSON.parse(read_file(nameCache, "{}"));
-        break;
-      case "output":
-        output = read_value(true);
-        break;
-      case "parse":
-        options.parse = parse_js(read_value(true), options.parse);
-        break;
-      case "rename":
-        options.rename = true;
-        break;
-      case "no-rename":
-        options.rename = false;
-        break;
-      case "reduce-test":
-      case "self":
-        break;
-      default:
-        fatal("invalid option --" + name);
-    }
-
-    function read_value(required) {
-        if (no_value || !args.length || args[0][0] == "-") {
-            if (required) fatal("missing option argument for --" + name);
-            return true;
-        }
-        return args.shift();
+program.version(info.name + " " + info.version);
+program.parseArgv = program.parse;
+program.parse = undefined;
+if (process.argv.indexOf("ast") >= 0) program.helpInformation = UglifyJS.describe_ast;
+else if (process.argv.indexOf("options") >= 0) program.helpInformation = function() {
+    var text = [];
+    var options = UglifyJS.default_options();
+    for (var option in options) {
+        text.push("--" + (option == "output" ? "beautify" : option == "sourceMap" ? "source-map" : option) + " options:");
+        text.push(format_object(options[option]));
+        text.push("");
     }
+    return text.join("\n");
+};
+program.option("-p, --parse <options>", "Specify parser options.", parse_js());
+program.option("-c, --compress [options]", "Enable compressor/specify compressor options.", parse_js());
+program.option("-m, --mangle [options]", "Mangle names/specify mangler options.", parse_js());
+program.option("--mangle-props [options]", "Mangle properties/specify mangler options.", parse_js());
+program.option("-b, --beautify [options]", "Beautify output/specify output options.", parse_js());
+program.option("-o, --output <file>", "Output file (default STDOUT).");
+program.option("--comments [filter]", "Preserve copyright comments in the output.");
+program.option("--config-file <file>", "Read minify() options from JSON file.");
+program.option("-d, --define <expr>[=value]", "Global definitions.", parse_js("define"));
+program.option("--ecma <version>", "Specify ECMAScript release: 5, 6, 7 or 8.");
+program.option("--ie8", "Support non-standard Internet Explorer 8.");
+program.option("--keep-classnames", "Do not mangle/drop class names.");
+program.option("--keep-fnames", "Do not mangle/drop function names. Useful for code relying on Function.prototype.name.");
+program.option("--name-cache <file>", "File to hold mangled name mappings.");
+program.option("--no-rename", "Disable symbol expansion.");
+program.option("--safari10", "Support non-standard Safari 10.");
+program.option("--self", "Build UglifyJS as a library (implies --wrap UglifyJS)");
+program.option("--source-map [options]", "Enable source map/specify source map options.", parse_source_map());
+program.option("--timings", "Display operations run time on STDERR.")
+program.option("--toplevel", "Compress and/or mangle variables in toplevel scope.");
+program.option("--verbose", "Print diagnostic messages.");
+program.option("--warn", "Print warning messages.");
+program.option("--wrap <name>", "Embed everything as a function with “exports” corresponding to “name” globally.");
+program.arguments("[files...]").parseArgv(process.argv);
+if (program.configFile) {
+    options = JSON.parse(read_file(program.configFile));
 }
-if (!output && options.sourceMap && options.sourceMap.url != "inline") fatal("cannot write source map to STDOUT");
-if (specified["beautify"] && specified["output-opts"]) fatal("--beautify cannot be used with --output-opts");
-[ "compress", "mangle" ].forEach(function(name) {
-    if (!(name in options)) options[name] = false;
+if (!program.output && program.sourceMap && program.sourceMap.url != "inline") {
+    fatal("ERROR: cannot write source map to STDOUT");
+}
+[
+    "compress",
+    "ie8",
+    "mangle",
+    "rename",
+    "safari10",
+    "sourceMap",
+    "toplevel",
+    "wrap"
+].forEach(function(name) {
+    if (name in program) {
+        if (name == "rename" && program[name]) return;
+        options[name] = program[name];
+    }
 });
-if (options.mangle && options.mangle.properties) {
-    if (options.mangle.properties.domprops) {
-        delete options.mangle.properties.domprops;
+if ("ecma" in program) {
+    if (program.ecma != (program.ecma | 0)) fatal("ERROR: ecma must be an integer");
+    options.ecma = program.ecma | 0;
+}
+if (program.beautify) {
+    options.output = typeof program.beautify == "object" ? program.beautify : {};
+    if (!("beautify" in options.output)) {
+        options.output.beautify = true;
+    }
+}
+if (program.comments) {
+    if (typeof options.output != "object") options.output = {};
+    options.output.comments = typeof program.comments == "string" ? program.comments : "some";
+}
+if (program.define) {
+    if (typeof options.compress != "object") options.compress = {};
+    if (typeof options.compress.global_defs != "object") options.compress.global_defs = {};
+    for (var expr in program.define) {
+        options.compress.global_defs[expr] = program.define[expr];
+    }
+}
+if (program.keepClassnames) {
+    options.keep_classnames = true;
+}
+if (program.keepFnames) {
+    options.keep_fnames = true;
+}
+if (program.mangleProps) {
+    if (program.mangleProps.domprops) {
+        delete program.mangleProps.domprops;
     } else {
-        if (typeof options.mangle.properties != "object") options.mangle.properties = {};
-        if (!Array.isArray(options.mangle.properties.reserved)) options.mangle.properties.reserved = [];
+        if (typeof program.mangleProps != "object") program.mangleProps = {};
+        if (!Array.isArray(program.mangleProps.reserved)) program.mangleProps.reserved = [];
         require("../tools/domprops").forEach(function(name) {
-            UglifyJS.push_uniq(options.mangle.properties.reserved, name);
+            UglifyJS._push_uniq(program.mangleProps.reserved, name);
         });
     }
+    if (typeof options.mangle != "object") options.mangle = {};
+    options.mangle.properties = program.mangleProps;
 }
-if (output == "ast") options.output = {
-    ast: true,
-    code: false,
-};
-if (options.parse && (options.parse.acorn || options.parse.spidermonkey)
-    && options.sourceMap && options.sourceMap.content == "inline") {
-    fatal("inline source map only works with built-in parser");
+if (program.nameCache) {
+    options.nameCache = JSON.parse(read_file(program.nameCache, "{}"));
 }
-if (options.warnings) {
-    UglifyJS.AST_Node.log_function(print_error, options.warnings == "verbose");
-    delete options.warnings;
+if (program.output == "ast") {
+    options.output = {
+        ast: true,
+        code: false
+    };
+}
+if (program.parse) {
+    if (!program.parse.acorn && !program.parse.spidermonkey) {
+        options.parse = program.parse;
+    } else if (program.sourceMap && program.sourceMap.content == "inline") {
+        fatal("ERROR: inline source map only works with built-in parser");
+    }
 }
 var convert_path = function(name) {
     return name;
 };
-if (typeof options.sourceMap == "object" && "base" in options.sourceMap) {
+if (typeof program.sourceMap == "object" && "base" in program.sourceMap) {
     convert_path = function() {
-        var base = options.sourceMap.base;
+        var base = program.sourceMap.base;
         delete options.sourceMap.base;
         return function(name) {
             return path.relative(base, name);
         };
     }();
 }
-if (specified["self"]) {
-    if (paths.length) UglifyJS.AST_Node.warn("Ignoring input files since --self was passed");
-    if (!options.wrap) options.wrap = "UglifyJS";
-    paths = UglifyJS.FILES;
+if (program.verbose) {
+    options.warnings = "verbose";
+} else if (program.warn) {
+    options.warnings = true;
 }
-if (paths.length) {
-    simple_glob(paths).forEach(function(name) {
+if (program.self) {
+    if (program.args.length) {
+        print_error("WARN: Ignoring input files since --self was passed");
+    }
+    if (!options.wrap) options.wrap = "UglifyJS";
+    simple_glob(UglifyJS.FILES).forEach(function(name) {
+        files[convert_path(name)] = read_file(name);
+    });
+    run();
+} else if (program.args.length) {
+    simple_glob(program.args).forEach(function(name) {
         files[convert_path(name)] = read_file(name);
     });
     run();
@@ -274,14 +184,13 @@ function convert_ast(fn) {
 }
 
 function run() {
-    var content = options.sourceMap && options.sourceMap.content;
-    if (content && content != "inline") {
-        UglifyJS.AST_Node.info("Using input source map: " + content);
-        options.sourceMap.content = read_file(content, content);
-    }
+    UglifyJS.AST_Node.warn_function = function(msg) {
+        print_error("WARN: " + msg);
+    };
+    if (program.timings) options.timings = true;
     try {
-        if (options.parse) {
-            if (options.parse.acorn) {
+        if (program.parse) {
+            if (program.parse.acorn) {
                 files = convert_ast(function(toplevel, name) {
                     return require("acorn").parse(files[name], {
                         locations: true,
@@ -289,7 +198,7 @@ function run() {
                         sourceFile: name
                     });
                 });
-            } else if (options.parse.spidermonkey) {
+            } else if (program.parse.spidermonkey) {
                 files = convert_ast(function(toplevel, name) {
                     var obj = JSON.parse(files[name]);
                     if (!toplevel) return obj;
@@ -301,59 +210,35 @@ function run() {
     } catch (ex) {
         fatal(ex);
     }
-    var result;
-    if (specified["reduce-test"]) {
-        // load on demand - assumes cloned repository
-        var reduce_test = require("../test/reduce");
-        if (Object.keys(files).length != 1) fatal("can only test on a single file");
-        result = reduce_test(files[Object.keys(files)[0]], options, {
-            log: print_error,
-            verbose: true,
-        });
-    } else {
-        result = UglifyJS.minify(files, options);
-    }
+    var result = UglifyJS.minify(files, options);
     if (result.error) {
         var ex = result.error;
         if (ex.name == "SyntaxError") {
             print_error("Parse error at " + ex.filename + ":" + ex.line + "," + ex.col);
-            var file = files[ex.filename];
-            if (file) {
-                var col = ex.col;
-                var lines = file.split(/\r?\n/);
-                var line = lines[ex.line - 1];
-                if (!line && !col) {
-                    line = lines[ex.line - 2];
-                    col = line.length;
-                }
-                if (line) {
-                    var limit = 70;
-                    if (col > limit) {
-                        line = line.slice(col - limit);
-                        col = limit;
-                    }
-                    print_error(line.slice(0, 80));
-                    print_error(line.slice(0, col).replace(/\S/g, " ") + "^");
-                }
+            var col = ex.col;
+            var lines = files[ex.filename].split(/\r?\n/);
+            var line = lines[ex.line - 1];
+            if (!line && !col) {
+                line = lines[ex.line - 2];
+                col = line.length;
             }
-        } else if (ex.defs) {
+            if (line) {
+                var limit = 70;
+                if (col > limit) {
+                    line = line.slice(col - limit);
+                    col = limit;
+                }
+                print_error(line.slice(0, 80));
+                print_error(line.slice(0, col).replace(/\S/g, " ") + "^");
+            }
+        }
+        if (ex.defs) {
             print_error("Supported options:");
             print_error(format_object(ex.defs));
         }
         fatal(ex);
-    } else if (output == "ast") {
-        if (!options.compress && !options.mangle) result.ast.figure_out_scope({});
+    } else if (program.output == "ast") {
         print(JSON.stringify(result.ast, function(key, value) {
-            if (value) switch (key) {
-              case "thedef":
-                return symdef(value);
-              case "enclosed":
-                return value.length ? value.map(symdef) : undefined;
-              case "variables":
-              case "functions":
-              case "globals":
-                return value.size() ? value.map(symdef) : undefined;
-            }
             if (skip_key(key)) return;
             if (value instanceof UglifyJS.AST_Token) return;
             if (value instanceof UglifyJS.Dictionary) return;
@@ -368,33 +253,33 @@ function run() {
             }
             return value;
         }, 2));
-    } else if (output == "spidermonkey") {
+    } else if (program.output == "spidermonkey") {
         print(JSON.stringify(UglifyJS.minify(result.code, {
             compress: false,
             mangle: false,
             output: {
                 ast: true,
                 code: false
-            },
+            }
         }).ast.to_mozilla_ast(), null, 2));
-    } else if (output) {
-        fs.writeFileSync(output, result.code);
-        if (result.map) fs.writeFileSync(output + ".map", result.map);
+    } else if (program.output) {
+        fs.writeFileSync(program.output, result.code);
+        if (result.map) {
+            fs.writeFileSync(program.output + ".map", result.map);
+        }
     } else {
         print(result.code);
     }
-    if (nameCache) fs.writeFileSync(nameCache, JSON.stringify(options.nameCache));
+    if (program.nameCache) {
+        fs.writeFileSync(program.nameCache, JSON.stringify(options.nameCache));
+    }
     if (result.timings) for (var phase in result.timings) {
         print_error("- " + phase + ": " + result.timings[phase].toFixed(3) + "s");
     }
 }
 
 function fatal(message) {
-    if (message instanceof Error) {
-        message = message.stack.replace(/^\S*?Error:/, "ERROR:")
-    } else {
-        message = "ERROR: " + message;
-    }
+    if (message instanceof Error) message = message.stack.replace(/^\S*?Error:/, "ERROR:")
     print_error(message);
     process.exit(1);
 }
@@ -419,7 +304,7 @@ function simple_glob(glob) {
                 .replace(/\?/g, "[^/\\\\]") + "$";
             var mod = process.platform === "win32" ? "i" : "";
             var rx = new RegExp(pattern, mod);
-            var results = entries.sort().filter(function(name) {
+            var results = entries.filter(function(name) {
                 return rx.test(name);
             }).map(function(name) {
                 return path.join(dir, name);
@@ -439,57 +324,74 @@ function read_file(path, default_value) {
     }
 }
 
-function parse_js(value, options, flag) {
-    if (!options || typeof options != "object") options = {};
-    if (typeof value == "string") try {
-        UglifyJS.parse(value, {
-            expression: true
-        }).walk(new UglifyJS.TreeWalker(function(node) {
-            if (node instanceof UglifyJS.AST_Assign) {
-                var name = node.left.print_to_string();
-                var value = node.right;
-                if (flag) {
-                    options[name] = value;
-                } else if (value instanceof UglifyJS.AST_Array) {
-                    options[name] = value.elements.map(to_string);
-                } else {
-                    options[name] = to_string(value);
+function parse_js(flag) {
+    return function(value, options) {
+        options = options || {};
+        try {
+            UglifyJS.minify(value, {
+                parse: {
+                    expression: true
+                },
+                compress: false,
+                mangle: false,
+                output: {
+                    ast: true,
+                    code: false
                 }
-                return true;
-            }
-            if (node instanceof UglifyJS.AST_Symbol || node instanceof UglifyJS.AST_PropAccess) {
-                var name = node.print_to_string();
-                options[name] = true;
-                return true;
-            }
-            if (!(node instanceof UglifyJS.AST_Sequence)) throw node;
+            }).ast.walk(new UglifyJS.TreeWalker(function(node) {
+                if (node instanceof UglifyJS.AST_Assign) {
+                    var name = node.left.print_to_string();
+                    var value = node.right;
+                    if (flag) {
+                        options[name] = value;
+                    } else if (value instanceof UglifyJS.AST_Array) {
+                        options[name] = value.elements.map(to_string);
+                    } else {
+                        options[name] = to_string(value);
+                    }
+                    return true;
+                }
+                if (node instanceof UglifyJS.AST_Symbol || node instanceof UglifyJS.AST_PropAccess) {
+                    var name = node.print_to_string();
+                    options[name] = true;
+                    return true;
+                }
+                if (!(node instanceof UglifyJS.AST_Sequence)) throw node;
 
-            function to_string(value) {
-                return value instanceof UglifyJS.AST_Constant ? value.value : value.print_to_string({
-                    quote_keys: true
-                });
+                function to_string(value) {
+                    return value instanceof UglifyJS.AST_Constant ? value.getValue() : value.print_to_string({
+                        quote_keys: true
+                    });
+                }
+            }));
+        } catch(ex) {
+            if (flag) {
+                fatal("Error parsing arguments for '" + flag + "': " + value);
+            } else {
+                options[value] = null;
             }
-        }));
-    } catch (ex) {
-        if (flag) {
-            fatal("cannot parse arguments for '" + flag + "': " + value);
-        } else {
-            options[value] = null;
         }
+        return options;
+    }
+}
+
+function parse_source_map() {
+    var parse = parse_js();
+    return function(value, options) {
+        var hasContent = options && "content" in options;
+        var settings = parse(value, options);
+        if (!hasContent && settings.content && settings.content != "inline") {
+            print_error("INFO: Using input source map: " + settings.content);
+            settings.content = read_file(settings.content, settings.content);
+        }
+        return settings;
     }
-    return options;
 }
 
 function skip_key(key) {
     return skip_keys.indexOf(key) >= 0;
 }
 
-function symdef(def) {
-    var ret = (1e6 + def.id) + " " + def.name;
-    if (def.mangled_name) ret += " " + def.mangled_name;
-    return ret;
-}
-
 function format_object(obj) {
     var lines = [];
     var padding = "";

lib/minify.js

@@ -1,47 +1,19 @@
 "use strict";
 
-var to_ascii, to_base64;
-if (typeof Buffer == "undefined") {
-    to_ascii = atob;
-    to_base64 = btoa;
-} else if (typeof Buffer.alloc == "undefined") {
-    to_ascii = function(b64) {
-        return new Buffer(b64, "base64").toString();
-    };
-    to_base64 = function(str) {
-        return new Buffer(str).toString("base64");
-    };
-} else {
-    to_ascii = function(b64) {
-        return Buffer.from(b64, "base64").toString();
-    };
-    to_base64 = function(str) {
-        return Buffer.from(str).toString("base64");
-    };
-}
+var to_ascii = typeof atob == "undefined" ? function(b64) {
+    return new Buffer(b64, "base64").toString();
+} : atob;
+var to_base64 = typeof btoa == "undefined" ? function(str) {
+    return new Buffer(str).toString("base64");
+} : btoa;
 
-function read_source_map(name, toplevel) {
-    var comments = toplevel.end.comments_after;
-    for (var i = comments.length; --i >= 0;) {
-        var comment = comments[i];
-        if (comment.type != "comment1") break;
-        var match = /^# ([^\s=]+)=(\S+)\s*$/.exec(comment.value);
-        if (!match) break;
-        if (match[1] == "sourceMappingURL") {
-            match = /^data:application\/json(;.*?)?;base64,(\S+)$/.exec(match[2]);
-            if (!match) break;
-            return to_ascii(match[2]);
-        }
-    }
-    AST_Node.warn("inline source map not found: " + name);
-}
-
-function parse_source_map(content) {
-    try {
-        return JSON.parse(content);
-    } catch (ex) {
-        throw new Error("invalid input source map: " + content);
+function read_source_map(code) {
+    var match = /\n\/\/# sourceMappingURL=data:application\/json(;.*?)?;base64,(.*)/.exec(code);
+    if (!match) {
+        AST_Node.warn("inline source map not found");
+        return null;
     }
+    return to_ascii(match[2]);
 }
 
 function set_shorthand(name, options, keys) {
@@ -57,6 +29,7 @@ function set_shorthand(name, options, keys) {
 
 function init_cache(cache) {
     if (!cache) return;
+    if (!("cname" in cache)) cache.cname = -1;
     if (!("props" in cache)) {
         cache.props = new Dictionary();
     } else if (!(cache.props instanceof Dictionary)) {
@@ -66,48 +39,59 @@ function init_cache(cache) {
 
 function to_json(cache) {
     return {
+        cname: cache.cname,
         props: cache.props.toObject()
     };
 }
 
 function minify(files, options) {
+    var warn_function = AST_Node.warn_function;
     try {
         options = defaults(options, {
             compress: {},
-            enclose: false,
+            ecma: undefined,
             ie8: false,
+            keep_classnames: undefined,
             keep_fnames: false,
             mangle: {},
             nameCache: null,
             output: {},
             parse: {},
             rename: undefined,
+            safari10: false,
             sourceMap: false,
             timings: false,
             toplevel: false,
-            validate: false,
             warnings: false,
             wrap: false,
         }, true);
-        if (options.validate) AST_Node.enable_validation();
         var timings = options.timings && {
             start: Date.now()
         };
+        if (options.keep_classnames === undefined) {
+            options.keep_classnames = options.keep_fnames;
+        }
         if (options.rename === undefined) {
             options.rename = options.compress && options.mangle;
         }
+        set_shorthand("ecma", options, [ "parse", "compress", "output" ]);
         set_shorthand("ie8", options, [ "compress", "mangle", "output" ]);
+        set_shorthand("keep_classnames", options, [ "compress", "mangle" ]);
         set_shorthand("keep_fnames", options, [ "compress", "mangle" ]);
+        set_shorthand("safari10", options, [ "mangle", "output" ]);
         set_shorthand("toplevel", options, [ "compress", "mangle" ]);
+        set_shorthand("warnings", options, [ "compress" ]);
         var quoted_props;
         if (options.mangle) {
             options.mangle = defaults(options.mangle, {
                 cache: options.nameCache && (options.nameCache.vars || {}),
                 eval: false,
                 ie8: false,
+                keep_classnames: false,
                 keep_fnames: false,
                 properties: false,
                 reserved: [],
+                safari10: false,
                 toplevel: false,
             }, true);
             if (options.mangle.properties) {
@@ -131,15 +115,16 @@ function minify(files, options) {
                 content: null,
                 filename: null,
                 includeSources: false,
-                names: true,
                 root: null,
                 url: null,
             }, true);
         }
         var warnings = [];
-        if (options.warnings) AST_Node.log_function(function(warning) {
-            warnings.push(warning);
-        }, options.warnings == "verbose");
+        if (options.warnings && !AST_Node.warn_function) {
+            AST_Node.warn_function = function(warning) {
+                warnings.push(warning);
+            };
+        }
         if (timings) timings.parse = Date.now();
         var toplevel;
         if (files instanceof AST_Toplevel) {
@@ -150,54 +135,42 @@ function minify(files, options) {
             }
             options.parse = options.parse || {};
             options.parse.toplevel = null;
-            var source_map_content = options.sourceMap && options.sourceMap.content;
-            if (typeof source_map_content == "string" && source_map_content != "inline") {
-                source_map_content = parse_source_map(source_map_content);
-            }
-            if (source_map_content) options.sourceMap.orig = Object.create(null);
             for (var name in files) if (HOP(files, name)) {
                 options.parse.filename = name;
-                options.parse.toplevel = toplevel = parse(files[name], options.parse);
-                if (source_map_content == "inline") {
-                    var inlined_content = read_source_map(name, toplevel);
-                    if (inlined_content) {
-                        options.sourceMap.orig[name] = parse_source_map(inlined_content);
-                    }
-                } else if (source_map_content) {
-                    options.sourceMap.orig[name] = source_map_content;
+                options.parse.toplevel = parse(files[name], options.parse);
+                if (options.sourceMap && options.sourceMap.content == "inline") {
+                    if (Object.keys(files).length > 1)
+                        throw new Error("inline source map only works with singular input");
+                    options.sourceMap.content = read_source_map(files[name]);
                 }
             }
+            toplevel = options.parse.toplevel;
         }
         if (quoted_props) {
             reserve_quoted_keys(toplevel, quoted_props);
         }
-        [ "enclose", "wrap" ].forEach(function(action) {
-            var option = options[action];
-            if (!option) return;
-            var orig = toplevel.print_to_string().slice(0, -1);
-            toplevel = toplevel[action](option);
-            files[toplevel.start.file] = toplevel.print_to_string().replace(orig, "");
-        });
-        if (options.validate) toplevel.validate_ast();
+        if (options.wrap) {
+            toplevel = toplevel.wrap_commonjs(options.wrap);
+        }
         if (timings) timings.rename = Date.now();
         if (options.rename) {
             toplevel.figure_out_scope(options.mangle);
             toplevel.expand_names(options.mangle);
         }
         if (timings) timings.compress = Date.now();
-        if (options.compress) {
-            toplevel = new Compressor(options.compress).compress(toplevel);
-            if (options.validate) toplevel.validate_ast();
-        }
+        if (options.compress) toplevel = new Compressor(options.compress).compress(toplevel);
         if (timings) timings.scope = Date.now();
         if (options.mangle) toplevel.figure_out_scope(options.mangle);
         if (timings) timings.mangle = Date.now();
         if (options.mangle) {
+            base54.reset();
             toplevel.compute_char_frequency(options.mangle);
             toplevel.mangle_names(options.mangle);
         }
         if (timings) timings.properties = Date.now();
-        if (options.mangle && options.mangle.properties) mangle_properties(toplevel, options.mangle.properties);
+        if (options.mangle && options.mangle.properties) {
+            toplevel = mangle_properties(toplevel, options.mangle.properties);
+        }
         if (timings) timings.output = Date.now();
         var result = {};
         if (options.output.ast) {
@@ -205,12 +178,19 @@ function minify(files, options) {
         }
         if (!HOP(options.output, "code") || options.output.code) {
             if (options.sourceMap) {
-                options.output.source_map = SourceMap(options.sourceMap);
+                if (typeof options.sourceMap.content == "string") {
+                    options.sourceMap.content = JSON.parse(options.sourceMap.content);
+                }
+                options.output.source_map = SourceMap({
+                    file: options.sourceMap.filename,
+                    orig: options.sourceMap.content,
+                    root: options.sourceMap.root
+                });
                 if (options.sourceMap.includeSources) {
                     if (files instanceof AST_Toplevel) {
                         throw new Error("original source content unavailable");
                     } else for (var name in files) if (HOP(files, name)) {
-                        options.output.source_map.setSourceContent(name, files[name]);
+                        options.output.source_map.get().setSourceContent(name, files[name]);
                     }
                 }
             }
@@ -221,14 +201,10 @@ function minify(files, options) {
             result.code = stream.get();
             if (options.sourceMap) {
                 result.map = options.output.source_map.toString();
-                var url = options.sourceMap.url;
-                if (url) {
-                    result.code = result.code.replace(/\n\/\/# sourceMappingURL=\S+\s*$/, "");
-                    if (url == "inline") {
-                        result.code += "\n//# sourceMappingURL=data:application/json;charset=utf-8;base64," + to_base64(result.map);
-                    } else {
-                        result.code += "\n//# sourceMappingURL=" + url;
-                    }
+                if (options.sourceMap.url == "inline") {
+                    result.code += "\n//# sourceMappingURL=data:application/json;charset=utf-8;base64," + to_base64(result.map);
+                } else if (options.sourceMap.url) {
+                    result.code += "\n//# sourceMappingURL=" + options.sourceMap.url;
                 }
             }
         }
@@ -249,7 +225,7 @@ function minify(files, options) {
                 properties: 1e-3 * (timings.output - timings.properties),
                 output: 1e-3 * (timings.end - timings.output),
                 total: 1e-3 * (timings.end - timings.start)
-            };
+            }
         }
         if (warnings.length) {
             result.warnings = warnings;
@@ -258,6 +234,6 @@ function minify(files, options) {
     } catch (ex) {
         return { error: ex };
     } finally {
-        AST_Node.disable_validation();
+        AST_Node.warn_function = warn_function;
     }
 }

lib/mozilla-ast.js

@@ -1,7 +1,7 @@
 /***********************************************************************
 
   A JavaScript tokenizer / parser / beautifier / compressor.
-  https://github.com/mishoo/UglifyJS
+  https://github.com/mishoo/UglifyJS2
 
   -------------------------------- (C) ---------------------------------
 
@@ -43,9 +43,11 @@
 
 "use strict";
 
-(function() {
-    function normalize_directives(body) {
+(function(){
+
+    var normalize_directives = function(body) {
         var in_directive = true;
+
         for (var i = 0; i < body.length; i++) {
             if (in_directive && body[i] instanceof AST_Statement && body[i].body instanceof AST_String) {
                 body[i] = new AST_Directive({
@@ -57,8 +59,9 @@
                 in_directive = false;
             }
         }
+
         return body;
-    }
+    };
 
     var MOZ_TO_ME = {
         Program: function(M) {
@@ -111,11 +114,11 @@
             var args = {
                 start    : my_start_token(key),
                 end      : my_end_token(M.value),
-                key      : "" + key[key.type == "Identifier" ? "name" : "value"],
+                key      : key.type == "Identifier" ? key.name : key.value,
                 value    : from_moz(M.value)
             };
             if (M.kind == "init") return new AST_ObjectKeyVal(args);
-            args.key = new AST_SymbolAccessor({
+            args.key = new AST_SymbolMethod({
                 name: args.key
             });
             args.value = new AST_Accessor(args.value);
@@ -126,7 +129,7 @@
             return new AST_Array({
                 start    : my_start_token(M),
                 end      : my_end_token(M),
-                elements : M.elements.map(function(elem) {
+                elements : M.elements.map(function(elem){
                     return elem === null ? new AST_Hole() : from_moz(elem);
                 })
             });
@@ -135,7 +138,7 @@
             return new AST_Object({
                 start      : my_start_token(M),
                 end        : my_end_token(M),
-                properties : M.properties.map(function(prop) {
+                properties : M.properties.map(function(prop){
                     prop.type = "Property";
                     return from_moz(prop)
                 })
@@ -165,7 +168,7 @@
             });
         },
         VariableDeclaration: function(M) {
-            return new AST_Var({
+            return new (M.kind === "const" ? AST_Const : AST_Var)({
                 start       : my_start_token(M),
                 end         : my_end_token(M),
                 definitions : M.declarations.map(from_moz)
@@ -177,17 +180,6 @@
                 end    : my_end_token(M)
             };
             if (val === null) return new AST_Null(args);
-            var rx = M.regex;
-            if (rx && rx.pattern) {
-                // RegExpLiteral as per ESTree AST spec
-                args.value = new RegExp(rx.pattern, rx.flags);
-                args.value.raw_source = rx.pattern;
-                return new AST_RegExp(args);
-            } else if (rx) {
-                // support legacy RegExp
-                args.value = M.regex && M.raw ? M.raw : val;
-                return new AST_RegExp(args);
-            }
             switch (typeof val) {
               case "string":
                 args.value = val;
@@ -197,12 +189,22 @@
                 return new AST_Number(args);
               case "boolean":
                 return new (val ? AST_True : AST_False)(args);
+              default:
+                var rx = M.regex;
+                if (rx && rx.pattern) {
+                    // RegExpLiteral as per ESTree AST spec
+                    args.value = new RegExp(rx.pattern, rx.flags).toString();
+                } else {
+                    // support legacy RegExp
+                    args.value = M.regex && M.raw ? M.raw : val;
+                }
+                return new AST_RegExp(args);
             }
         },
         Identifier: function(M) {
             var p = FROM_MOZ_STACK[FROM_MOZ_STACK.length - 2];
             return new (  p.type == "LabeledStatement" ? AST_Label
-                        : p.type == "VariableDeclarator" && p.id === M ? AST_SymbolVar
+                        : p.type == "VariableDeclarator" && p.id === M ? (p.kind == "const" ? AST_SymbolConst : AST_SymbolVar)
                         : p.type == "FunctionExpression" ? (p.id === M ? AST_SymbolLambda : AST_SymbolFunarg)
                         : p.type == "FunctionDeclaration" ? (p.id === M ? AST_SymbolDefun : AST_SymbolFunarg)
                         : p.type == "CatchClause" ? AST_SymbolCatch
@@ -212,14 +214,7 @@
                             end   : my_end_token(M),
                             name  : M.name
                         });
-        },
-        ThisExpression: function(M) {
-            return new AST_This({
-                start : my_start_token(M),
-                end   : my_end_token(M),
-                name  : "this",
-            });
-        },
+        }
     };
 
     MOZ_TO_ME.UpdateExpression =
@@ -252,6 +247,7 @@
     map("VariableDeclarator", AST_VarDef, "id>name, init>value");
     map("CatchClause", AST_Catch, "param>argname, body%body");
 
+    map("ThisExpression", AST_This);
     map("BinaryExpression", AST_Binary, "operator=operator, left>left, right>right");
     map("LogicalExpression", AST_Binary, "operator=operator, left>left, right>right");
     map("AssignmentExpression", AST_Assign, "operator=operator, left>left, right>right");
@@ -328,7 +324,7 @@
     def_to_moz(AST_Definitions, function To_Moz_VariableDeclaration(M) {
         return {
             type: "VariableDeclaration",
-            kind: "var",
+            kind: M instanceof AST_Const ? "const" : "var",
             declarations: M.definitions.map(to_moz)
         };
     });
@@ -385,7 +381,7 @@
     def_to_moz(AST_ObjectProperty, function To_Moz_Property(M) {
         var key = {
             type: "Literal",
-            value: M.key instanceof AST_SymbolAccessor ? M.key.name : M.key
+            value: M.key instanceof AST_SymbolMethod ? M.key.name : M.key
         };
         var kind;
         if (M instanceof AST_ObjectKeyVal) {
@@ -409,24 +405,19 @@
         var def = M.definition();
         return {
             type: "Identifier",
-            name: def && def.mangled_name || M.name
+            name: def ? def.mangled_name || def.name : M.name
         };
     });
 
-    def_to_moz(AST_This, function To_Moz_ThisExpression() {
-        return { type: "ThisExpression" };
-    });
-
     def_to_moz(AST_RegExp, function To_Moz_RegExpLiteral(M) {
-        var flags = M.value.toString().match(/[gimuy]*$/)[0];
-        var value = "/" + M.value.raw_source + "/" + flags;
+        var value = M.value;
         return {
             type: "Literal",
             value: value,
-            raw: value,
+            raw: value.toString(),
             regex: {
-                pattern: M.value.raw_source,
-                flags: flags
+                pattern: value.source,
+                flags: value.toString().match(/[gimuy]*$/)[0]
             }
         };
     });
@@ -487,7 +478,7 @@
             endpos  : range ? range[0] : moznode.start,
             raw     : raw_token(moznode),
         });
-    }
+    };
 
     function my_end_token(moznode) {
         var loc = moznode.loc, end = loc && loc.end;
@@ -502,7 +493,7 @@
             endpos  : range ? range[1] : moznode.end,
             raw     : raw_token(moznode),
         });
-    }
+    };
 
     function map(moztype, mytype, propmap) {
         var moz_to_me = "function From_Moz_" + moztype + "(M){\n";
@@ -514,7 +505,7 @@
         me_to_moz += "return {\n" +
             "type: " + JSON.stringify(moztype);
 
-        if (propmap) propmap.split(/\s*,\s*/).forEach(function(prop) {
+        if (propmap) propmap.split(/\s*,\s*/).forEach(function(prop){
             var m = /([a-z0-9$_]+)(=|@|>|%)([a-z0-9$_]+)/i.exec(prop);
             if (!m) throw new Error("Can't understand property map: " + prop);
             var moz = m[1], how = m[2], my = m[3];
@@ -557,7 +548,7 @@
         );
         MOZ_TO_ME[moztype] = moz_to_me;
         def_to_moz(mytype, me_to_moz);
-    }
+    };
 
     var FROM_MOZ_STACK = null;
 
@@ -566,28 +557,13 @@
         var ret = node != null ? MOZ_TO_ME[node.type](node) : null;
         FROM_MOZ_STACK.pop();
         return ret;
-    }
+    };
 
-    AST_Node.from_mozilla_ast = function(node) {
+    AST_Node.from_mozilla_ast = function(node){
         var save_stack = FROM_MOZ_STACK;
         FROM_MOZ_STACK = [];
         var ast = from_moz(node);
         FROM_MOZ_STACK = save_stack;
-        ast.walk(new TreeWalker(function(node) {
-            if (node instanceof AST_LabelRef) {
-                for (var level = 0, parent; parent = this.parent(level); level++) {
-                    if (parent instanceof AST_Scope) break;
-                    if (parent instanceof AST_LabeledStatement && parent.label.name == node.name) {
-                        node.thedef = parent.label;
-                        break;
-                    }
-                }
-                if (!node.thedef) {
-                    var s = node.start;
-                    js_error("Undefined label " + node.name, s.file, s.line, s.col, s.pos);
-                }
-            }
-        }));
         return ast;
     };
 
@@ -607,24 +583,24 @@
             }
         }
         return moznode;
-    }
+    };
 
     function def_to_moz(mytype, handler) {
         mytype.DEFMETHOD("to_mozilla_ast", function() {
             return set_moz_loc(this, handler(this));
         });
-    }
+    };
 
     function to_moz(node) {
         return node != null ? node.to_mozilla_ast() : null;
-    }
+    };
 
     function to_moz_block(node) {
         return {
             type: "BlockStatement",
             body: node.body.map(to_moz)
         };
-    }
+    };
 
     function to_moz_scope(type, node) {
         var body = node.body.map(to_moz);
@@ -635,5 +611,5 @@
             type: type,
             body: body
         };
-    }
+    };
 })();

lib/propmangle.js

@@ -1,7 +1,7 @@
 /***********************************************************************
 
   A JavaScript tokenizer / parser / beautifier / compressor.
-  https://github.com/mishoo/UglifyJS
+  https://github.com/mishoo/UglifyJS2
 
   -------------------------------- (C) ---------------------------------
 
@@ -43,8 +43,17 @@
 
 "use strict";
 
-var builtins = function() {
-    var names = [];
+function find_builtins(reserved) {
+
+    // Compatibility fix for some standard defined globals not defined on every js environment
+    var new_globals = ["Symbol", "Map", "Promise", "Proxy", "Reflect", "Set", "WeakMap", "WeakSet"];
+    var objects = {};
+    var global_ref = typeof global === "object" ? global : self;
+
+    new_globals.forEach(function (new_global) {
+        objects[new_global] = global_ref[new_global] || new Function();
+    });
+
     // NaN will be included due to Number.NaN
     [
         "null",
@@ -54,54 +63,56 @@ var builtins = function() {
         "-Infinity",
         "undefined",
     ].forEach(add);
-    [
-        Array,
-        Boolean,
-        Date,
-        Error,
-        Function,
-        Math,
-        Number,
-        Object,
-        RegExp,
-        String,
-    ].forEach(function(ctor) {
+    [ Object, Array, Function, Number,
+      String, Boolean, Error, Math,
+      Date, RegExp, objects.Symbol, ArrayBuffer,
+      DataView, decodeURI, decodeURIComponent,
+      encodeURI, encodeURIComponent, eval, EvalError,
+      Float32Array, Float64Array, Int8Array, Int16Array,
+      Int32Array, isFinite, isNaN, JSON, objects.Map, parseFloat,
+      parseInt, objects.Promise, objects.Proxy, RangeError, ReferenceError,
+      objects.Reflect, objects.Set, SyntaxError, TypeError, Uint8Array,
+      Uint8ClampedArray, Uint16Array, Uint32Array, URIError,
+      objects.WeakMap, objects.WeakSet
+    ].forEach(function(ctor){
         Object.getOwnPropertyNames(ctor).map(add);
         if (ctor.prototype) {
-            Object.getOwnPropertyNames(new ctor()).map(add);
             Object.getOwnPropertyNames(ctor.prototype).map(add);
         }
     });
-    return makePredicate(names);
-
-    function add(name) {
-        names.push(name);
-    }
-}();
-
-function reserve_quoted_keys(ast, reserved) {
-    ast.walk(new TreeWalker(function(node) {
-        if (node instanceof AST_ObjectKeyVal) {
-            if (node.quote) add(node.key);
-        } else if (node instanceof AST_Sub) {
-            addStrings(node.property, add);
-        }
-    }));
-
     function add(name) {
         push_uniq(reserved, name);
     }
 }
 
-function addStrings(node, add) {
-    if (node instanceof AST_Conditional) {
-        addStrings(node.consequent, add);
-        addStrings(node.alternative, add);
-    } else if (node instanceof AST_Sequence) {
-        addStrings(node.tail_node(), add);
-    } else if (node instanceof AST_String) {
-        add(node.value);
+function reserve_quoted_keys(ast, reserved) {
+    function add(name) {
+        push_uniq(reserved, name);
     }
+
+    ast.walk(new TreeWalker(function(node) {
+        if (node instanceof AST_ObjectKeyVal && node.quote) {
+            add(node.key);
+        } else if (node instanceof AST_ObjectProperty && node.quote) {
+            add(node.key.name);
+        } else if (node instanceof AST_Sub) {
+            addStrings(node.property, add);
+        }
+    }));
+}
+
+function addStrings(node, add) {
+    node.walk(new TreeWalker(function(node) {
+        if (node instanceof AST_Sequence) {
+            addStrings(node.tail_node(), add);
+        } else if (node instanceof AST_String) {
+            add(node.value);
+        } else if (node instanceof AST_Conditional) {
+            addStrings(node.consequent, add);
+            addStrings(node.alternative, add);
+        }
+        return true;
+    }));
 }
 
 function mangle_properties(ast, options) {
@@ -115,20 +126,16 @@ function mangle_properties(ast, options) {
         reserved: null,
     }, true);
 
-    var reserved = Object.create(options.builtins ? null : builtins);
-    if (Array.isArray(options.reserved)) options.reserved.forEach(function(name) {
-        reserved[name] = true;
-    });
+    var reserved = options.reserved;
+    if (!Array.isArray(reserved)) reserved = [];
+    if (!options.builtins) find_builtins(reserved);
 
-    var cname = -1;
-    var cache;
-    if (options.cache) {
-        cache = options.cache.props;
-        cache.each(function(name) {
-            reserved[name] = true;
-        });
-    } else {
-        cache = new Dictionary();
+    var cache = options.cache;
+    if (cache == null) {
+        cache = {
+            cname: -1,
+            props: new Dictionary()
+        };
     }
 
     var regex = options.regex;
@@ -137,126 +144,118 @@ function mangle_properties(ast, options) {
     // note debug may be enabled as an empty string, which is falsey. Also treat passing 'true'
     // the same as passing an empty string.
     var debug = options.debug !== false;
-    var debug_suffix;
-    if (debug) debug_suffix = options.debug === true ? "" : options.debug;
+    var debug_name_suffix;
+    if (debug) {
+        debug_name_suffix = (options.debug === true ? "" : options.debug);
+    }
 
-    var names_to_mangle = Object.create(null);
-    var unmangleable = Object.create(reserved);
+    var names_to_mangle = [];
+    var unmangleable = [];
 
     // step 1: find candidates to mangle
-    ast.walk(new TreeWalker(function(node) {
-        if (node instanceof AST_Binary) {
-            if (node.operator == "in") addStrings(node.left, add);
-        } else if (node.TYPE == "Call") {
-            var exp = node.expression;
-            if (exp instanceof AST_Dot) switch (exp.property) {
-              case "defineProperty":
-              case "getOwnPropertyDescriptor":
-                if (node.args.length < 2) break;
-                exp = exp.expression;
-                if (!(exp instanceof AST_SymbolRef)) break;
-                if (exp.name != "Object") break;
-                if (!exp.definition().undeclared) break;
-                addStrings(node.args[1], add);
-                break;
-              case "hasOwnProperty":
-                if (node.args.length < 1) break;
-                addStrings(node.args[0], add);
-                break;
-            }
-        } else if (node instanceof AST_Dot) {
-            add(node.property);
-        } else if (node instanceof AST_ObjectKeyVal) {
+    ast.walk(new TreeWalker(function(node){
+        if (node instanceof AST_ObjectKeyVal) {
             add(node.key);
-        } else if (node instanceof AST_ObjectProperty) {
+        }
+        else if (node instanceof AST_ObjectProperty) {
             // setter or getter, since KeyVal is handled above
             add(node.key.name);
-        } else if (node instanceof AST_Sub) {
+        }
+        else if (node instanceof AST_Dot) {
+            add(node.property);
+        }
+        else if (node instanceof AST_Sub) {
             addStrings(node.property, add);
         }
     }));
 
-    // step 2: renaming properties
-    ast.walk(new TreeWalker(function(node) {
-        if (node instanceof AST_Binary) {
-            if (node.operator == "in") mangleStrings(node.left);
-        } else if (node.TYPE == "Call") {
-            var exp = node.expression;
-            if (exp instanceof AST_Dot) switch (exp.property) {
-              case "defineProperty":
-              case "getOwnPropertyDescriptor":
-                if (node.args.length < 2) break;
-                exp = exp.expression;
-                if (!(exp instanceof AST_SymbolRef)) break;
-                if (exp.name != "Object") break;
-                if (!exp.definition().undeclared) break;
-                mangleStrings(node.args[1]);
-                break;
-              case "hasOwnProperty":
-                if (node.args.length < 1) break;
-                mangleStrings(node.args[0]);
-                break;
-            }
-        } else if (node instanceof AST_Dot) {
-            node.property = mangle(node.property);
-        } else if (node instanceof AST_ObjectKeyVal) {
+    // step 2: transform the tree, renaming properties
+    return ast.transform(new TreeTransformer(function(node){
+        if (node instanceof AST_ObjectKeyVal) {
             node.key = mangle(node.key);
-        } else if (node instanceof AST_ObjectProperty) {
+        }
+        else if (node instanceof AST_ObjectProperty) {
             // setter or getter
             node.key.name = mangle(node.key.name);
-        } else if (node instanceof AST_Sub) {
-            if (!options.keep_quoted) mangleStrings(node.property);
+        }
+        else if (node instanceof AST_Dot) {
+            node.property = mangle(node.property);
+        }
+        else if (!options.keep_quoted && node instanceof AST_Sub) {
+            node.property = mangleStrings(node.property);
         }
     }));
 
     // only function declarations after this line
 
     function can_mangle(name) {
-        if (unmangleable[name]) return false;
-        if (options.only_cache) return cache.has(name);
+        if (unmangleable.indexOf(name) >= 0) return false;
+        if (reserved.indexOf(name) >= 0) return false;
+        if (options.only_cache) {
+            return cache.props.has(name);
+        }
         if (/^-?[0-9]+(\.[0-9]+)?(e[+-][0-9]+)?$/.test(name)) return false;
         return true;
     }
 
     function should_mangle(name) {
-        if (reserved[name]) return false;
         if (regex && !regex.test(name)) return false;
-        return cache.has(name) || names_to_mangle[name];
+        if (reserved.indexOf(name) >= 0) return false;
+        return cache.props.has(name)
+            || names_to_mangle.indexOf(name) >= 0;
     }
 
     function add(name) {
-        if (can_mangle(name)) names_to_mangle[name] = true;
-        if (!should_mangle(name)) unmangleable[name] = true;
+        if (can_mangle(name))
+            push_uniq(names_to_mangle, name);
+
+        if (!should_mangle(name)) {
+            push_uniq(unmangleable, name);
+        }
     }
 
     function mangle(name) {
         if (!should_mangle(name)) {
             return name;
         }
-        var mangled = cache.get(name);
+
+        var mangled = cache.props.get(name);
         if (!mangled) {
             if (debug) {
                 // debug mode: use a prefix and suffix to preserve readability, e.g. o.foo -> o._$foo$NNN_.
-                var debug_mangled = "_$" + name + "$" + debug_suffix + "_";
-                if (can_mangle(debug_mangled)) mangled = debug_mangled;
+                var debug_mangled = "_$" + name + "$" + debug_name_suffix + "_";
+
+                if (can_mangle(debug_mangled)) {
+                    mangled = debug_mangled;
+                }
             }
+
             // either debug mode is off, or it is on and we could not use the mangled name
-            if (!mangled) do {
-                mangled = base54(++cname);
-            } while (!can_mangle(mangled));
-            cache.set(name, mangled);
+            if (!mangled) {
+                do {
+                    mangled = base54(++cache.cname);
+                } while (!can_mangle(mangled));
+            }
+
+            cache.props.set(name, mangled);
         }
         return mangled;
     }
 
     function mangleStrings(node) {
-        if (node instanceof AST_Sequence) {
-            mangleStrings(node.expressions.tail_node());
-        } else if (node instanceof AST_String) {
-            node.value = mangle(node.value);
-        } else if (node instanceof AST_Conditional) {
-            mangleStrings(node.consequent);
-            mangleStrings(node.alternative);
-        }
+        return node.transform(new TreeTransformer(function(node){
+            if (node instanceof AST_Sequence) {
+                var last = node.expressions.length - 1;
+                node.expressions[last] = mangleStrings(node.expressions[last]);
+            }
+            else if (node instanceof AST_String) {
+                node.value = mangle(node.value);
+            }
+            else if (node instanceof AST_Conditional) {
+                node.consequent = mangleStrings(node.consequent);
+                node.alternative = mangleStrings(node.alternative);
+            }
+            return node;
+        }));
     }
 }

lib/scope.js

@@ -1,7 +1,7 @@
 /***********************************************************************
 
   A JavaScript tokenizer / parser / beautifier / compressor.
-  https://github.com/mishoo/UglifyJS
+  https://github.com/mishoo/UglifyJS2
 
   -------------------------------- (C) ---------------------------------
 
@@ -43,41 +43,53 @@
 
 "use strict";
 
-function SymbolDef(id, scope, orig, init) {
-    this.eliminated = 0;
-    this.global = false;
-    this.id = id;
-    this.init = init;
-    this.lambda = orig instanceof AST_SymbolLambda;
-    this.mangled_name = null;
+function SymbolDef(scope, orig) {
     this.name = orig.name;
     this.orig = [ orig ];
+    this.eliminated = 0;
+    this.scope = scope;
     this.references = [];
     this.replaced = 0;
-    this.scope = scope;
+    this.global = false;
+    this.export = false;
+    this.mangled_name = null;
     this.undeclared = false;
-}
+    this.id = SymbolDef.next_id++;
+};
+
+SymbolDef.next_id = 1;
 
 SymbolDef.prototype = {
     unmangleable: function(options) {
-        return this.global && !options.toplevel
+        if (!options) options = {};
+
+        return (this.global && !options.toplevel)
+            || this.export
             || this.undeclared
-            || !options.eval && this.scope.pinned()
-            || options.keep_fnames
+            || (!options.eval && (this.scope.uses_eval || this.scope.uses_with))
+            || (options.keep_fnames
                 && (this.orig[0] instanceof AST_SymbolLambda
-                    || this.orig[0] instanceof AST_SymbolDefun);
+                    || this.orig[0] instanceof AST_SymbolDefun))
+            || this.orig[0] instanceof AST_SymbolMethod
+            || (options.keep_classnames
+                && (this.orig[0] instanceof AST_SymbolClass
+                    || this.orig[0] instanceof AST_SymbolDefClass));
     },
     mangle: function(options) {
         var cache = options.cache && options.cache.props;
         if (this.global && cache && cache.has(this.name)) {
             this.mangled_name = cache.get(this.name);
-        } else if (!this.mangled_name && !this.unmangleable(options)) {
+        }
+        else if (!this.mangled_name && !this.unmangleable(options)) {
+            var s = this.scope;
+            var sym = this.orig[0];
+            if (options.ie8 && sym instanceof AST_SymbolLambda)
+                s = s.parent_scope;
             var def;
             if (def = this.redefined()) {
                 this.mangled_name = def.mangled_name || def.name;
-            } else {
-                this.mangled_name = next_mangled_name(this.scope, options, this);
-            }
+            } else
+                this.mangled_name = s.next_mangled(options, this);
             if (this.global && cache) {
                 cache.set(this.name, this.mangled_name);
             }
@@ -88,37 +100,71 @@ SymbolDef.prototype = {
     }
 };
 
-AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
+AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
     options = defaults(options, {
         cache: null,
         ie8: false,
+        safari10: false,
     });
 
     // pass 1: setup scope chaining and handle definitions
     var self = this;
     var scope = self.parent_scope = null;
+    var labels = new Dictionary();
     var defun = null;
-    var tw = new TreeWalker(function(node, descend) {
-        if (node instanceof AST_Catch) {
+    var in_destructuring = null;
+    var for_scopes = [];
+    var tw = new TreeWalker(function(node, descend){
+        if (node.is_block_scope()) {
             var save_scope = scope;
-            scope = new AST_Scope(node);
+            node.block_scope = scope = new AST_Scope(node);
             scope.init_scope_vars(save_scope);
+            if (!(node instanceof AST_Scope)) {
+                scope.uses_with = save_scope.uses_with;
+                scope.uses_eval = save_scope.uses_eval;
+                scope.directives = save_scope.directives;
+            }
+            if (options.safari10) {
+                if (node instanceof AST_For || node instanceof AST_ForIn) {
+                    for_scopes.push(scope);
+                }
+            }
             descend();
             scope = save_scope;
             return true;
         }
+        if (node instanceof AST_Destructuring) {
+            in_destructuring = node;  // These don't nest
+            descend();
+            in_destructuring = null;
+            return true;
+        }
         if (node instanceof AST_Scope) {
             node.init_scope_vars(scope);
             var save_scope = scope;
             var save_defun = defun;
+            var save_labels = labels;
             defun = scope = node;
+            labels = new Dictionary();
             descend();
             scope = save_scope;
             defun = save_defun;
-            return true;
+            labels = save_labels;
+            return true;        // don't descend again in TreeWalker
+        }
+        if (node instanceof AST_LabeledStatement) {
+            var l = node.label;
+            if (labels.has(l.name)) {
+                throw new Error(string_template("Label {name} defined twice", l));
+            }
+            labels.set(l.name, l);
+            descend();
+            labels.del(l.name);
+            return true;        // no descend again
         }
         if (node instanceof AST_With) {
-            for (var s = scope; s; s = s.parent_scope) s.uses_with = true;
+            for (var s = scope; s; s = s.parent_scope)
+                s.uses_with = true;
             return;
         }
         if (node instanceof AST_Symbol) {
@@ -128,130 +174,174 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
             node.thedef = node;
             node.references = [];
         }
-        if (node instanceof AST_SymbolDefun) {
-            // This should be defined in the parent scope, as we encounter the
-            // AST_Defun node before getting to its AST_Symbol.
-            (node.scope = defun.parent_scope.resolve()).def_function(node, defun);
-        } else if (node instanceof AST_SymbolLambda) {
-            var def = defun.def_function(node, node.name == "arguments" ? undefined : defun);
-            if (options.ie8) def.defun = defun.parent_scope.resolve();
-        } else if (node instanceof AST_SymbolVar) {
-            defun.def_variable(node, node.TYPE == "SymbolVar" ? null : undefined);
+        if (node instanceof AST_SymbolLambda) {
+            defun.def_function(node);
+        }
+        else if (node instanceof AST_SymbolDefun) {
+            // Careful here, the scope where this should be defined is
+            // the parent scope.  The reason is that we enter a new
+            // scope when we encounter the AST_Defun node (which is
+            // instanceof AST_Scope) but we get to the symbol a bit
+            // later.
+            mark_export((node.scope = defun.parent_scope.get_defun_scope()).def_function(node), 1);
+        }
+        else if (node instanceof AST_SymbolClass) {
+            mark_export(defun.def_variable(node), 1);
+        }
+        else if (node instanceof AST_SymbolImport) {
+            scope.def_variable(node);
+        }
+        else if (node instanceof AST_SymbolDefClass) {
+            // This deals with the name of the class being available
+            // inside the class.
+            mark_export((node.scope = defun.parent_scope).def_function(node), 1);
+        }
+        else if (node instanceof AST_SymbolVar
+            || node instanceof AST_SymbolLet
+            || node instanceof AST_SymbolConst) {
+            var def = ((node instanceof AST_SymbolBlockDeclaration) ? scope : defun).def_variable(node);
+            if (!all(def.orig, function(sym) {
+                if (sym === node) return true;
+                if (node instanceof AST_SymbolBlockDeclaration) {
+                    return sym instanceof AST_SymbolLambda;
+                }
+                return !(sym instanceof AST_SymbolLet || sym instanceof AST_SymbolConst);
+            })) {
+                js_error(
+                    node.name + " redeclared",
+                    node.start.file,
+                    node.start.line,
+                    node.start.col,
+                    node.start.pos
+                );
+            }
+            if (!(node instanceof AST_SymbolFunarg)) mark_export(def, 2);
+            def.destructuring = in_destructuring;
             if (defun !== scope) {
                 node.mark_enclosed(options);
                 var def = scope.find_variable(node);
                 if (node.thedef !== def) {
                     node.thedef = def;
+                    node.reference(options);
                 }
-                node.reference(options);
             }
-        } else if (node instanceof AST_SymbolCatch) {
+        }
+        else if (node instanceof AST_SymbolCatch) {
             scope.def_variable(node).defun = defun;
         }
+        else if (node instanceof AST_LabelRef) {
+            var sym = labels.get(node.name);
+            if (!sym) throw new Error(string_template("Undefined label {name} [{line},{col}]", {
+                name: node.name,
+                line: node.start.line,
+                col: node.start.col
+            }));
+            node.thedef = sym;
+        }
+        if (!(scope instanceof AST_Toplevel) && (node instanceof AST_Export || node instanceof AST_Import)) {
+            js_error(
+                node.TYPE + " statement may only appear at top level",
+                node.start.file,
+                node.start.line,
+                node.start.col,
+                node.start.pos
+            );
+        }
+
+        function mark_export(def, level) {
+            if (in_destructuring) {
+                var i = 0;
+                do {
+                    level++;
+                } while (tw.parent(i++) !== in_destructuring);
+            }
+            var node = tw.parent(level);
+            def.export = node instanceof AST_Export;
+        }
     });
-    self.next_def_id = 0;
     self.walk(tw);
 
     // pass 2: find back references and eval
     self.globals = new Dictionary();
-    var tw = new TreeWalker(function(node) {
-        if (node instanceof AST_LoopControl) {
-            if (node.label) node.label.thedef.references.push(node);
+    var tw = new TreeWalker(function(node, descend){
+        if (node instanceof AST_LoopControl && node.label) {
+            node.label.thedef.references.push(node);
             return true;
         }
         if (node instanceof AST_SymbolRef) {
             var name = node.name;
-            var sym = node.scope.find_variable(name);
-            if (!sym) {
+            if (name == "eval" && tw.parent() instanceof AST_Call) {
+                for (var s = node.scope; s && !s.uses_eval; s = s.parent_scope) {
+                    s.uses_eval = true;
+                }
+            }
+            var sym;
+            if (tw.parent() instanceof AST_NameMapping && tw.parent(1).module_name
+                || !(sym = node.scope.find_variable(name))) {
                 sym = self.def_global(node);
             } else if (sym.scope instanceof AST_Lambda && name == "arguments") {
                 sym.scope.uses_arguments = true;
             }
-            if (name == "eval") {
-                var parent = tw.parent();
-                if (parent.TYPE == "Call" && parent.expression === node) {
-                    for (var s = node.scope; s && !s.uses_eval; s = s.parent_scope) {
-                        s.uses_eval = true;
-                    }
-                } else if (sym.undeclared) {
-                    self.uses_eval = true;
-                }
-            }
             node.thedef = sym;
             node.reference(options);
             return true;
         }
         // ensure mangling works if catch reuses a scope variable
-        if (node instanceof AST_SymbolCatch) {
-            var def = node.definition().redefined();
-            if (def) for (var s = node.scope; s; s = s.parent_scope) {
+        var def;
+        if (node instanceof AST_SymbolCatch && (def = node.definition().redefined())) {
+            var s = node.scope;
+            while (s) {
                 push_uniq(s.enclosed, def);
                 if (s === def.scope) break;
+                s = s.parent_scope;
             }
-            return true;
         }
     });
     self.walk(tw);
 
     // pass 3: fix up any scoping issue with IE8
-    if (options.ie8) self.walk(new TreeWalker(function(node) {
-        if (node instanceof AST_SymbolCatch) {
-            var scope = node.thedef.defun;
-            if (scope.name instanceof AST_SymbolLambda && scope.name.name == node.name) {
-                scope = scope.parent_scope.resolve();
+    if (options.ie8) {
+        self.walk(new TreeWalker(function(node, descend) {
+            if (node instanceof AST_SymbolCatch) {
+                var name = node.name;
+                var refs = node.thedef.references;
+                var scope = node.thedef.defun;
+                var def = scope.find_variable(name) || self.globals.get(name) || scope.def_variable(node);
+                refs.forEach(function(ref) {
+                    ref.thedef = def;
+                    ref.reference(options);
+                });
+                node.thedef = def;
+                node.reference(options);
+                return true;
             }
-            redefine(node, scope);
-            return true;
-        }
-        if (node instanceof AST_SymbolLambda) {
-            var def = node.thedef;
-            redefine(node, node.scope.parent_scope.resolve());
-            if (typeof node.thedef.init !== "undefined") {
-                node.thedef.init = false;
-            } else if (def.init) {
-                node.thedef.init = def.init;
-            }
-            return true;
-        }
-    }));
+        }));
+    }
 
-    function redefine(node, scope) {
-        var name = node.name;
-        var old_def = node.thedef;
-        var new_def = scope.find_variable(name);
-        if (new_def) {
-            var redef;
-            while (redef = new_def.redefined()) new_def = redef;
-        } else {
-            new_def = self.globals.get(name);
+    // pass 4: add symbol definitions to loop scopes
+    // Safari/Webkit bug workaround - loop init let variable shadowing argument.
+    // https://github.com/mishoo/UglifyJS2/issues/1753
+    // https://bugs.webkit.org/show_bug.cgi?id=171041
+    if (options.safari10) {
+        for (var i = 0; i < for_scopes.length; i++) {
+            var scope = for_scopes[i];
+            scope.parent_scope.variables.each(function(def) {
+                push_uniq(scope.enclosed, def);
+            });
         }
-        if (new_def) {
-            new_def.orig.push(node);
-        } else {
-            new_def = scope.def_variable(node);
-        }
-        old_def.defun = new_def.scope;
-        old_def.orig.concat(old_def.references).forEach(function(node) {
-            node.thedef = new_def;
-            node.reference(options);
-        });
-        if (old_def.lambda) new_def.lambda = true;
-        if (new_def.undeclared) self.variables.set(name, new_def);
+    }
+
+    if (options.cache) {
+        this.cname = options.cache.cname;
     }
 });
 
-AST_Scope.DEFMETHOD("make_def", function(orig, init) {
-    var top = this;
-    while (top.parent_scope) top = top.parent_scope;
-    return new SymbolDef(++top.next_def_id, this, orig, init);
-});
-
-AST_Toplevel.DEFMETHOD("def_global", function(node) {
+AST_Toplevel.DEFMETHOD("def_global", function(node){
     var globals = this.globals, name = node.name;
     if (globals.has(name)) {
         return globals.get(name);
     } else {
-        var g = this.make_def(node);
+        var g = new SymbolDef(this, node);
         g.undeclared = true;
         g.global = true;
         globals.set(name, g);
@@ -259,7 +349,7 @@ AST_Toplevel.DEFMETHOD("def_global", function(node) {
     }
 });
 
-AST_Scope.DEFMETHOD("init_scope_vars", function(parent_scope) {
+AST_Scope.DEFMETHOD("init_scope_vars", function(parent_scope){
     this.variables = new Dictionary();  // map name to AST_SymbolVar (variables defined in this scope; includes functions)
     this.functions = new Dictionary();  // map name to AST_SymbolDefun (functions defined in this scope)
     this.uses_with = false;             // will be set to true if this or some nested scope uses the `with` statement
@@ -269,7 +359,15 @@ AST_Scope.DEFMETHOD("init_scope_vars", function(parent_scope) {
     this.cname = -1;                    // the current index for mangling functions/variables
 });
 
-AST_Lambda.DEFMETHOD("init_scope_vars", function() {
+AST_Node.DEFMETHOD("is_block_scope", return_false);
+AST_Class.DEFMETHOD("is_block_scope", return_false);
+AST_Lambda.DEFMETHOD("is_block_scope", return_false);
+AST_Toplevel.DEFMETHOD("is_block_scope", return_false);
+AST_SwitchBranch.DEFMETHOD("is_block_scope", return_false);
+AST_Block.DEFMETHOD("is_block_scope", return_true);
+AST_IterationStatement.DEFMETHOD("is_block_scope", return_true);
+
+AST_Lambda.DEFMETHOD("init_scope_vars", function(){
     AST_Scope.prototype.init_scope_vars.apply(this, arguments);
     this.uses_arguments = false;
     this.def_variable(new AST_SymbolFunarg({
@@ -281,7 +379,8 @@ AST_Lambda.DEFMETHOD("init_scope_vars", function() {
 
 AST_Symbol.DEFMETHOD("mark_enclosed", function(options) {
     var def = this.definition();
-    for (var s = this.scope; s; s = s.parent_scope) {
+    var s = this.scope;
+    while (s) {
         push_uniq(s.enclosed, def);
         if (options.keep_fnames) {
             s.functions.each(function(d) {
@@ -289,6 +388,7 @@ AST_Symbol.DEFMETHOD("mark_enclosed", function(options) {
             });
         }
         if (s === def.scope) break;
+        s = s.parent_scope;
     }
 });
 
@@ -297,89 +397,71 @@ AST_Symbol.DEFMETHOD("reference", function(options) {
     this.mark_enclosed(options);
 });
 
-AST_Scope.DEFMETHOD("find_variable", function(name) {
+AST_Scope.DEFMETHOD("find_variable", function(name){
     if (name instanceof AST_Symbol) name = name.name;
     return this.variables.get(name)
         || (this.parent_scope && this.parent_scope.find_variable(name));
 });
 
-AST_Scope.DEFMETHOD("def_function", function(symbol, init) {
-    var def = this.def_variable(symbol, init);
-    if (!def.init || def.init instanceof AST_Defun) def.init = init;
+AST_Scope.DEFMETHOD("def_function", function(symbol){
+    var def = this.def_variable(symbol);
     this.functions.set(symbol.name, def);
     return def;
 });
 
-AST_Scope.DEFMETHOD("def_variable", function(symbol, init) {
-    var def = this.variables.get(symbol.name);
-    if (def) {
-        def.orig.push(symbol);
-        if (def.init instanceof AST_Function) def.init = init;
-    } else {
-        def = this.make_def(symbol, init);
+AST_Scope.DEFMETHOD("def_variable", function(symbol){
+    var def;
+    if (!this.variables.has(symbol.name)) {
+        def = new SymbolDef(this, symbol);
         this.variables.set(symbol.name, def);
         def.global = !this.parent_scope;
+    } else {
+        def = this.variables.get(symbol.name);
+        def.orig.push(symbol);
     }
     return symbol.thedef = def;
 });
 
-AST_Lambda.DEFMETHOD("resolve", return_this);
-AST_Scope.DEFMETHOD("resolve", function() {
-    return this.parent_scope.resolve();
+AST_Scope.DEFMETHOD("next_mangled", function(options){
+    var ext = this.enclosed;
+    out: while (true) {
+        var m = base54(++this.cname);
+        if (!is_identifier(m)) continue; // skip over "do"
+
+        // https://github.com/mishoo/UglifyJS2/issues/242 -- do not
+        // shadow a name reserved from mangling.
+        if (member(m, options.reserved)) continue;
+
+        // we must ensure that the mangled name does not shadow a name
+        // from some parent scope that is referenced in this or in
+        // inner scopes.
+        for (var i = ext.length; --i >= 0;) {
+            var sym = ext[i];
+            var name = sym.mangled_name || (sym.unmangleable(options) && sym.name);
+            if (m == name) continue out;
+        }
+        return m;
+    }
 });
-AST_Toplevel.DEFMETHOD("resolve", return_this);
 
-function names_in_use(scope, options) {
-    var names = scope.names_in_use;
-    if (!names) {
-        scope.names_in_use = names = Object.create(scope.mangled_names || null);
-        scope.cname_holes = [];
-        var cache = options.cache && options.cache.props;
-        scope.enclosed.forEach(function(def) {
-            if (def.unmangleable(options)) names[def.name] = true;
-            if (def.global && cache && cache.has(def.name)) {
-                names[cache.get(def.name)] = true;
-            }
-        });
-    }
-    return names;
-}
+AST_Function.DEFMETHOD("next_mangled", function(options, def){
+    // #179, #326
+    // in Safari strict mode, something like (function x(x){...}) is a syntax error;
+    // a function expression's argument cannot shadow the function expression's name
+
+    var tricky_def = def.orig[0] instanceof AST_SymbolFunarg && this.name && this.name.definition();
+
+    // the function's mangled_name is null when keep_fnames is true
+    var tricky_name = tricky_def ? tricky_def.mangled_name || tricky_def.name : null;
 
-function next_mangled_name(scope, options, def) {
-    var in_use = names_in_use(scope, options);
-    var holes = scope.cname_holes;
-    var names = Object.create(null);
-    var scopes = [ scope ];
-    def.references.forEach(function(sym) {
-        var scope = sym.scope;
-        do {
-            if (scopes.indexOf(scope) < 0) {
-                for (var name in names_in_use(scope, options)) {
-                    names[name] = true;
-                }
-                scopes.push(scope);
-            } else break;
-        } while (scope = scope.parent_scope);
-    });
-    var name;
-    for (var i = 0; i < holes.length; i++) {
-        name = base54(holes[i]);
-        if (names[name]) continue;
-        holes.splice(i, 1);
-        scope.names_in_use[name] = true;
-        return name;
-    }
     while (true) {
-        name = base54(++scope.cname);
-        if (in_use[name] || RESERVED_WORDS[name] || options.reserved.has[name]) continue;
-        if (!names[name]) break;
-        holes.push(scope.cname);
+        var name = AST_Lambda.prototype.next_mangled.call(this, options, def);
+        if (!tricky_name || tricky_name != name)
+            return name;
     }
-    scope.names_in_use[name] = true;
-    return name;
-}
+});
 
-AST_Symbol.DEFMETHOD("unmangleable", function(options) {
+AST_Symbol.DEFMETHOD("unmangleable", function(options){
     var def = this.definition();
     return !def || def.unmangleable(options);
 });
@@ -387,22 +469,24 @@ AST_Symbol.DEFMETHOD("unmangleable", function(options) {
 // labels are always mangleable
 AST_Label.DEFMETHOD("unmangleable", return_false);
 
-AST_Symbol.DEFMETHOD("unreferenced", function() {
-    return !this.definition().references.length && !this.scope.pinned();
+AST_Symbol.DEFMETHOD("unreferenced", function(){
+    return this.definition().references.length == 0
+        && !(this.scope.uses_eval || this.scope.uses_with);
 });
 
-AST_Symbol.DEFMETHOD("definition", function() {
+AST_Symbol.DEFMETHOD("definition", function(){
     return this.thedef;
 });
 
-AST_Symbol.DEFMETHOD("global", function() {
+AST_Symbol.DEFMETHOD("global", function(){
     return this.definition().global;
 });
 
-function _default_mangler_options(options) {
+AST_Toplevel.DEFMETHOD("_default_mangler_options", function(options) {
     options = defaults(options, {
         eval        : false,
         ie8         : false,
+        keep_classnames: false,
         keep_fnames : false,
         reserved    : [],
         toplevel    : false,
@@ -410,142 +494,123 @@ function _default_mangler_options(options) {
     if (!Array.isArray(options.reserved)) options.reserved = [];
     // Never mangle arguments
     push_uniq(options.reserved, "arguments");
-    options.reserved.has = makePredicate(options.reserved);
     return options;
-}
+});
 
-AST_Toplevel.DEFMETHOD("mangle_names", function(options) {
-    options = _default_mangler_options(options);
+AST_Toplevel.DEFMETHOD("mangle_names", function(options){
+    options = this._default_mangler_options(options);
 
     // We only need to mangle declaration nodes.  Special logic wired
     // into the code generator will display the mangled name if it's
     // present (and for AST_SymbolRef-s it'll use the mangled name of
     // the AST_SymbolDeclaration that it points to).
     var lname = -1;
+    var to_mangle = [];
 
-    if (options.cache && options.cache.props) {
-        var mangled_names = this.mangled_names = Object.create(null);
-        options.cache.props.each(function(mangled_name) {
-            mangled_names[mangled_name] = true;
-        });
+    if (options.cache) {
+        this.globals.each(collect);
     }
 
-    var redefined = [];
-    var tw = new TreeWalker(function(node, descend) {
+    var tw = new TreeWalker(function(node, descend){
         if (node instanceof AST_LabeledStatement) {
             // lname is incremented when we get to the AST_Label
             var save_nesting = lname;
             descend();
             lname = save_nesting;
-            return true;
+            return true;        // don't descend again in TreeWalker
         }
         if (node instanceof AST_Scope) {
-            descend();
-            if (options.cache && node instanceof AST_Toplevel) {
-                node.globals.each(mangle);
-            }
-            if (node instanceof AST_Defun && tw.has_directive("use asm")) {
-                var sym = new AST_SymbolRef(node.name);
-                sym.scope = node;
-                sym.reference(options);
-            }
-            node.variables.each(function(def) {
-                if (!defer_redef(def)) mangle(def);
-            });
-            return true;
+            node.variables.each(collect);
+            return;
         }
         if (node instanceof AST_Label) {
             var name;
-            do {
-                name = base54(++lname);
-            } while (RESERVED_WORDS[name]);
+            do name = base54(++lname); while (!is_identifier(name));
             node.mangled_name = name;
             return true;
         }
-        if (!options.ie8 && node instanceof AST_Catch) {
-            var def = node.argname.definition();
-            var redef = defer_redef(def, node.argname);
-            descend();
-            if (!redef) mangle(def);
-            return true;
+        var mangle_with_block_scope =
+            (!options.ie8 && node instanceof AST_SymbolCatch) ||
+            node instanceof AST_SymbolBlockDeclaration;
+        if (mangle_with_block_scope && options.reserved.indexOf(node.name) < 0) {
+            to_mangle.push(node.definition());
+            return;
         }
     });
     this.walk(tw);
-    redefined.forEach(mangle);
-
-    function mangle(def) {
-        if (options.reserved.has[def.name]) return;
+    to_mangle.forEach(function(def){
         def.mangle(options);
+    });
+
+    if (options.cache) {
+        options.cache.cname = this.cname;
     }
 
-    function defer_redef(def, node) {
-        var redef = def.redefined();
-        if (!redef) return false;
-        redefined.push(def);
-        def.references.forEach(reference);
-        if (node) reference(node);
-        return true;
-
-        function reference(sym) {
-            sym.thedef = redef;
-            sym.reference(options);
-            sym.thedef = def;
+    function collect(symbol) {
+        if (!member(symbol.name, options.reserved)) {
+            to_mangle.push(symbol);
         }
     }
 });
 
-AST_Toplevel.DEFMETHOD("find_colliding_names", function(options) {
+AST_Toplevel.DEFMETHOD("find_unique_prefix", function(options) {
+    var letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_";
     var cache = options.cache && options.cache.props;
-    var avoid = Object.create(null);
-    options.reserved.forEach(to_avoid);
+    var prefixes = Object.create(null);
+    options.reserved.forEach(add_prefix);
     this.globals.each(add_def);
     this.walk(new TreeWalker(function(node) {
         if (node instanceof AST_Scope) node.variables.each(add_def);
         if (node instanceof AST_SymbolCatch) add_def(node.definition());
     }));
-    return avoid;
+    var prefix, i = 0;
+    do {
+        prefix = create_name(i++);
+    } while (prefixes[prefix]);
+    return prefix;
 
-    function to_avoid(name) {
-        avoid[name] = true;
+    function add_prefix(name) {
+        if (/[0-9]$/.test(name)) {
+            prefixes[name.replace(/[0-9]+$/, "")] = true;
+        }
     }
 
     function add_def(def) {
         var name = def.name;
         if (def.global && cache && cache.has(name)) name = cache.get(name);
         else if (!def.unmangleable(options)) return;
-        to_avoid(name);
+        add_prefix(name);
+    }
+
+    function create_name(num) {
+        var name = "";
+        do {
+            name += letters[num % letters.length];
+            num = Math.floor(num / letters.length);
+        } while (num);
+        return name;
     }
 });
 
 AST_Toplevel.DEFMETHOD("expand_names", function(options) {
-    base54.reset();
-    base54.sort();
-    options = _default_mangler_options(options);
-    var avoid = this.find_colliding_names(options);
-    var cname = 0;
+    options = this._default_mangler_options(options);
+    var prefix = this.find_unique_prefix(options);
     this.globals.each(rename);
     this.walk(new TreeWalker(function(node) {
         if (node instanceof AST_Scope) node.variables.each(rename);
         if (node instanceof AST_SymbolCatch) rename(node.definition());
     }));
 
-    function next_name() {
-        var name;
-        do {
-            name = base54(cname++);
-        } while (avoid[name] || RESERVED_WORDS[name]);
-        return name;
-    }
-
     function rename(def) {
-        if (def.global && options.cache) return;
-        if (def.unmangleable(options)) return;
-        if (options.reserved.has[def.name]) return;
-        var redef = def.redefined();
-        var name = redef ? redef.rename || redef.name : next_name();
-        def.rename = name;
-        def.orig.concat(def.references).forEach(function(sym) {
-            if (sym.definition() === def) sym.name = name;
+        if (def.global || def.unmangleable(options)) return;
+        if (member(def.name, options.reserved)) return;
+        var d = def.redefined();
+        def.name = d ? d.name : prefix + def.id;
+        def.orig.forEach(function(sym) {
+            sym.name = def.name;
+        });
+        def.references.forEach(function(sym) {
+            sym.name = def.name;
         });
     }
 });
@@ -555,27 +620,24 @@ AST_Sequence.DEFMETHOD("tail_node", function() {
     return this.expressions[this.expressions.length - 1];
 });
 
-AST_Toplevel.DEFMETHOD("compute_char_frequency", function(options) {
-    options = _default_mangler_options(options);
-    base54.reset();
+AST_Toplevel.DEFMETHOD("compute_char_frequency", function(options){
+    options = this._default_mangler_options(options);
     try {
-        var fn = AST_Symbol.prototype.add_source_map;
-        AST_Symbol.prototype.add_source_map = function() {
-            if (!this.unmangleable(options)) base54.consider(this.name, -1);
+        AST_Node.prototype.print = function(stream, force_parens) {
+            this._print(stream, force_parens);
+            if (this instanceof AST_Symbol && !this.unmangleable(options)) {
+                base54.consider(this.name, -1);
+            } else if (options.properties) {
+                if (this instanceof AST_Dot) {
+                    base54.consider(this.property, -1);
+                } else if (this instanceof AST_Sub) {
+                    skip_string(this.property);
+                }
+            }
         };
-        if (options.properties) {
-            AST_Dot.prototype.add_source_map = function() {
-                base54.consider(this.property, -1);
-            };
-            AST_Sub.prototype.add_source_map = function() {
-                skip_string(this.property);
-            };
-        }
         base54.consider(this.print_to_string(), 1);
     } finally {
-        AST_Symbol.prototype.add_source_map = fn;
-        delete AST_Dot.prototype.add_source_map;
-        delete AST_Sub.prototype.add_source_map;
+        AST_Node.prototype.print = AST_Node.prototype._print;
     }
     base54.sort();
 
@@ -592,21 +654,17 @@ AST_Toplevel.DEFMETHOD("compute_char_frequency", function(options) {
 });
 
 var base54 = (function() {
-    var freq = Object.create(null);
-    function init(chars) {
-        var array = [];
-        for (var i = 0; i < chars.length; i++) {
-            var ch = chars[i];
-            array.push(ch);
-            freq[ch] = -1e-2 * i;
-        }
-        return array;
-    }
-    var digits = init("0123456789");
-    var leading = init("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_");
+    var leading = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_".split("");
+    var digits = "0123456789".split("");
     var chars, frequency;
     function reset() {
-        frequency = Object.create(freq);
+        frequency = Object.create(null);
+        leading.forEach(function(ch) {
+            frequency[ch] = 0;
+        });
+        digits.forEach(function(ch) {
+            frequency[ch] = 0;
+        });
     }
     base54.consider = function(str, delta) {
         for (var i = str.length; --i >= 0;) {
@@ -617,7 +675,7 @@ var base54 = (function() {
         return frequency[b] - frequency[a];
     }
     base54.sort = function() {
-        chars = leading.sort(compare).concat(digits.sort(compare));
+        chars = mergeSort(leading, compare).concat(mergeSort(digits, compare));
     };
     base54.reset = reset;
     reset();
@@ -631,6 +689,6 @@ var base54 = (function() {
             base = 64;
         } while (num > 0);
         return ret;
-    }
+    };
     return base54;
 })();

lib/sourcemap.js

@@ -1,7 +1,7 @@
 /***********************************************************************
 
   A JavaScript tokenizer / parser / beautifier / compressor.
-  https://github.com/mishoo/UglifyJS
+  https://github.com/mishoo/UglifyJS2
 
   -------------------------------- (C) ---------------------------------
 
@@ -43,149 +43,55 @@
 
 "use strict";
 
-var vlq_char = characters("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/");
-var vlq_bits = vlq_char.reduce(function(map, ch, bits) {
-    map[ch] = bits;
-    return map;
-}, Object.create(null));
-
-function vlq_decode(indices, str) {
-    var value = 0;
-    var shift = 0;
-    for (var i = 0, j = 0; i < str.length; i++) {
-        var bits = vlq_bits[str[i]];
-        value += (bits & 31) << shift;
-        if (bits & 32) {
-            shift += 5;
-        } else {
-            indices[j++] += value & 1 ? 0x80000000 | -(value >> 1) : value >> 1;
-            value = shift = 0;
-        }
-    }
-    return j;
-}
-
-function vlq_encode(num) {
-    var result = "";
-    num = Math.abs(num) << 1 | num >>> 31;
-    do {
-        var bits = num & 31;
-        if (num >>>= 5) bits |= 32;
-        result += vlq_char[bits];
-    } while (num);
-    return result;
-}
-
-function create_array_map() {
-    var map = Object.create(null);
-    var array = [];
-    array.index = function(name) {
-        if (!HOP(map, name)) {
-            map[name] = array.length;
-            array.push(name);
-        }
-        return map[name];
-    };
-    return array;
-}
-
+// a small wrapper around fitzgen's source-map library
 function SourceMap(options) {
-    var sources = create_array_map();
-    var sources_content = options.includeSources && Object.create(null);
-    var names = create_array_map();
-    var mappings = "";
-    if (options.orig) Object.keys(options.orig).forEach(function(name) {
-        var map = options.orig[name];
-        var indices = [ 0, 0, 1, 0, 0 ];
-        options.orig[name] = {
-            names: map.names,
-            mappings: map.mappings.split(/;/).map(function(line) {
-                indices[0] = 0;
-                return line.split(/,/).map(function(segment) {
-                    return indices.slice(0, vlq_decode(indices, segment));
-                });
-            }),
-            sources: map.sources,
-        };
-        if (!sources_content || !map.sourcesContent) return;
-        for (var i = 0; i < map.sources.length; i++) {
-            var content = map.sourcesContent[i];
-            if (content) sources_content[map.sources[i]] = content;
-        }
+    options = defaults(options, {
+        file : null,
+        root : null,
+        orig : null,
+
+        orig_line_diff : 0,
+        dest_line_diff : 0,
     });
-    var prev_source;
-    var generated_line = 1;
-    var generated_column = 0;
-    var source_index = 0;
-    var original_line = 1;
-    var original_column = 0;
-    var name_index = 0;
-    return {
-        add: options.orig ? function(source, gen_line, gen_col, orig_line, orig_col, name) {
-            var map = options.orig[source];
-            if (map) {
-                var segments = map.mappings[orig_line - 1];
-                if (!segments) return;
-                var indices;
-                for (var i = 0; i < segments.length; i++) {
-                    var col = segments[i][0];
-                    if (orig_col >= col) indices = segments[i];
-                    if (orig_col <= col) break;
-                }
-                if (!indices || indices.length < 4) {
-                    source = null;
-                } else {
-                    source = map.sources[indices[1]];
-                    orig_line = indices[2];
-                    orig_col = indices[3];
-                    if (indices.length > 4) name = map.names[indices[4]];
-                }
+    var generator = new MOZ_SourceMap.SourceMapGenerator({
+        file       : options.file,
+        sourceRoot : options.root
+    });
+    var orig_map = options.orig && new MOZ_SourceMap.SourceMapConsumer(options.orig);
+
+    if (orig_map && Array.isArray(options.orig.sources)) {
+        orig_map._sources.toArray().forEach(function(source) {
+            var sourceContent = orig_map.sourceContentFor(source, true);
+            if (sourceContent) {
+                generator.setSourceContent(source, sourceContent);
             }
-            add(source, gen_line, gen_col, orig_line, orig_col, name);
-        } : add,
-        setSourceContent: sources_content ? function(source, content) {
-            sources_content[source] = content;
-        } : noop,
-        toString: function() {
-            return JSON.stringify({
-                version: 3,
-                file: options.filename || undefined,
-                sourceRoot: options.root || undefined,
-                sources: sources,
-                sourcesContent: sources_content ? sources.map(function(source) {
-                    return sources_content[source] || null;
-                }) : undefined,
-                names: names,
-                mappings: mappings,
-            });
-        }
-    };
+        });
+    }
 
     function add(source, gen_line, gen_col, orig_line, orig_col, name) {
-        if (prev_source == null && source == null) return;
-        prev_source = source;
-        if (generated_line < gen_line) {
-            generated_column = 0;
-            do {
-                mappings += ";";
-            } while (++generated_line < gen_line);
-        } else if (mappings) {
-            mappings += ",";
+        if (orig_map) {
+            var info = orig_map.originalPositionFor({
+                line: orig_line,
+                column: orig_col
+            });
+            if (info.source === null) {
+                return;
+            }
+            source = info.source;
+            orig_line = info.line;
+            orig_col = info.column;
+            name = info.name || name;
         }
-        mappings += vlq_encode(gen_col - generated_column);
-        generated_column = gen_col;
-        if (source == null) return;
-        var src_idx = sources.index(source);
-        mappings += vlq_encode(src_idx - source_index);
-        source_index = src_idx;
-        mappings += vlq_encode(orig_line - original_line);
-        original_line = orig_line;
-        mappings += vlq_encode(orig_col - original_column);
-        original_column = orig_col;
-        if (options.names && name != null) {
-            var name_idx = names.index(name);
-            mappings += vlq_encode(name_idx - name_index);
-            name_index = name_idx;
-        }
-    }
-}
+        generator.addMapping({
+            generated : { line: gen_line + options.dest_line_diff, column: gen_col },
+            original  : { line: orig_line + options.orig_line_diff, column: orig_col },
+            source    : source,
+            name      : name
+        });
+    };
+    return {
+        add        : add,
+        get        : function() { return generator },
+        toString   : function() { return JSON.stringify(generator.toJSON()); }
+    };
+};

lib/transform.js

@@ -1,7 +1,7 @@
 /***********************************************************************
 
   A JavaScript tokenizer / parser / beautifier / compressor.
-  https://github.com/mishoo/UglifyJS
+  https://github.com/mishoo/UglifyJS2
 
   -------------------------------- (C) ---------------------------------
 
@@ -43,6 +43,8 @@
 
 "use strict";
 
+// Tree transformer helpers.
+
 function TreeTransformer(before, after) {
     TreeWalker.call(this);
     this.before = before;
@@ -50,136 +52,218 @@ function TreeTransformer(before, after) {
 }
 TreeTransformer.prototype = new TreeWalker;
 
-(function(DEF) {
+(function(undefined){
+
+    function _(node, descend) {
+        node.DEFMETHOD("transform", function(tw, in_list){
+            var x, y;
+            tw.push(this);
+            if (tw.before) x = tw.before(this, descend, in_list);
+            if (x === undefined) {
+                x = this;
+                descend(x, tw);
+                if (tw.after) {
+                    y = tw.after(x, in_list);
+                    if (y !== undefined) x = y;
+                }
+            }
+            tw.pop();
+            return x;
+        });
+    };
+
     function do_list(list, tw) {
-        return List(list, function(node) {
+        return MAP(list, function(node){
             return node.transform(tw, true);
         });
-    }
+    };
 
-    DEF(AST_Node, noop);
-    DEF(AST_LabeledStatement, function(self, tw) {
+    _(AST_Node, noop);
+
+    _(AST_LabeledStatement, function(self, tw){
         self.label = self.label.transform(tw);
         self.body = self.body.transform(tw);
     });
-    DEF(AST_SimpleStatement, function(self, tw) {
+
+    _(AST_SimpleStatement, function(self, tw){
         self.body = self.body.transform(tw);
     });
-    DEF(AST_Block, function(self, tw) {
+
+    _(AST_Block, function(self, tw){
         self.body = do_list(self.body, tw);
     });
-    DEF(AST_Do, function(self, tw) {
-        self.body = self.body.transform(tw);
-        self.condition = self.condition.transform(tw);
-    });
-    DEF(AST_While, function(self, tw) {
+
+    _(AST_DWLoop, function(self, tw){
         self.condition = self.condition.transform(tw);
         self.body = self.body.transform(tw);
     });
-    DEF(AST_For, function(self, tw) {
+
+    _(AST_For, function(self, tw){
         if (self.init) self.init = self.init.transform(tw);
         if (self.condition) self.condition = self.condition.transform(tw);
         if (self.step) self.step = self.step.transform(tw);
         self.body = self.body.transform(tw);
     });
-    DEF(AST_ForIn, function(self, tw) {
+
+    _(AST_ForIn, function(self, tw){
         self.init = self.init.transform(tw);
         self.object = self.object.transform(tw);
         self.body = self.body.transform(tw);
     });
-    DEF(AST_With, function(self, tw) {
+
+    _(AST_With, function(self, tw){
         self.expression = self.expression.transform(tw);
         self.body = self.body.transform(tw);
     });
-    DEF(AST_Exit, function(self, tw) {
+
+    _(AST_Exit, function(self, tw){
         if (self.value) self.value = self.value.transform(tw);
     });
-    DEF(AST_LoopControl, function(self, tw) {
+
+    _(AST_LoopControl, function(self, tw){
         if (self.label) self.label = self.label.transform(tw);
     });
-    DEF(AST_If, function(self, tw) {
+
+    _(AST_If, function(self, tw){
         self.condition = self.condition.transform(tw);
         self.body = self.body.transform(tw);
         if (self.alternative) self.alternative = self.alternative.transform(tw);
     });
-    DEF(AST_Switch, function(self, tw) {
+
+    _(AST_Switch, function(self, tw){
         self.expression = self.expression.transform(tw);
         self.body = do_list(self.body, tw);
     });
-    DEF(AST_Case, function(self, tw) {
+
+    _(AST_Case, function(self, tw){
         self.expression = self.expression.transform(tw);
         self.body = do_list(self.body, tw);
     });
-    DEF(AST_Try, function(self, tw) {
+
+    _(AST_Try, function(self, tw){
         self.body = do_list(self.body, tw);
         if (self.bcatch) self.bcatch = self.bcatch.transform(tw);
         if (self.bfinally) self.bfinally = self.bfinally.transform(tw);
     });
-    DEF(AST_Catch, function(self, tw) {
+
+    _(AST_Catch, function(self, tw){
         self.argname = self.argname.transform(tw);
         self.body = do_list(self.body, tw);
     });
-    DEF(AST_Definitions, function(self, tw) {
+
+    _(AST_Definitions, function(self, tw){
         self.definitions = do_list(self.definitions, tw);
     });
-    DEF(AST_VarDef, function(self, tw) {
+
+    _(AST_VarDef, function(self, tw){
         self.name = self.name.transform(tw);
         if (self.value) self.value = self.value.transform(tw);
     });
-    DEF(AST_Lambda, function(self, tw) {
+
+    _(AST_Destructuring, function(self, tw) {
+        self.names = do_list(self.names, tw);
+    });
+
+    _(AST_Lambda, function(self, tw){
         if (self.name) self.name = self.name.transform(tw);
         self.argnames = do_list(self.argnames, tw);
-        self.body = do_list(self.body, tw);
+        if (self.body instanceof AST_Node) {
+            self.body = self.body.transform(tw);
+        } else {
+            self.body = do_list(self.body, tw);
+        }
     });
-    DEF(AST_Call, function(self, tw) {
+
+    _(AST_Call, function(self, tw){
         self.expression = self.expression.transform(tw);
         self.args = do_list(self.args, tw);
     });
-    DEF(AST_Sequence, function(self, tw) {
+
+    _(AST_Sequence, function(self, tw){
         self.expressions = do_list(self.expressions, tw);
     });
-    DEF(AST_Dot, function(self, tw) {
+
+    _(AST_Dot, function(self, tw){
         self.expression = self.expression.transform(tw);
     });
-    DEF(AST_Sub, function(self, tw) {
+
+    _(AST_Sub, function(self, tw){
         self.expression = self.expression.transform(tw);
         self.property = self.property.transform(tw);
     });
-    DEF(AST_Unary, function(self, tw) {
+
+    _(AST_Yield, function(self, tw){
+        if (self.expression) self.expression = self.expression.transform(tw);
+    });
+
+    _(AST_Await, function(self, tw){
         self.expression = self.expression.transform(tw);
     });
-    DEF(AST_Binary, function(self, tw) {
+
+    _(AST_Unary, function(self, tw){
+        self.expression = self.expression.transform(tw);
+    });
+
+    _(AST_Binary, function(self, tw){
         self.left = self.left.transform(tw);
         self.right = self.right.transform(tw);
     });
-    DEF(AST_Conditional, function(self, tw) {
+
+    _(AST_Conditional, function(self, tw){
         self.condition = self.condition.transform(tw);
         self.consequent = self.consequent.transform(tw);
         self.alternative = self.alternative.transform(tw);
     });
-    DEF(AST_Array, function(self, tw) {
+
+    _(AST_Array, function(self, tw){
         self.elements = do_list(self.elements, tw);
     });
-    DEF(AST_Object, function(self, tw) {
+
+    _(AST_Object, function(self, tw){
         self.properties = do_list(self.properties, tw);
     });
-    DEF(AST_ObjectProperty, function(self, tw) {
+
+    _(AST_ObjectProperty, function(self, tw){
+        if (self.key instanceof AST_Node) {
+            self.key = self.key.transform(tw);
+        }
         self.value = self.value.transform(tw);
     });
-})(function(node, descend) {
-    node.DEFMETHOD("transform", function(tw, in_list) {
-        var x, y;
-        tw.push(this);
-        if (tw.before) x = tw.before(this, descend, in_list);
-        if (typeof x === "undefined") {
-            x = this;
-            descend(x, tw);
-            if (tw.after) {
-                y = tw.after(x, in_list);
-                if (typeof y !== "undefined") x = y;
-            }
-        }
-        tw.pop();
-        return x;
+
+    _(AST_Class, function(self, tw){
+        if (self.name) self.name = self.name.transform(tw);
+        if (self.extends) self.extends = self.extends.transform(tw);
+        self.properties = do_list(self.properties, tw);
     });
-});
+
+    _(AST_Expansion, function(self, tw){
+        self.expression = self.expression.transform(tw);
+    });
+
+    _(AST_NameMapping, function(self, tw) {
+        self.foreign_name = self.foreign_name.transform(tw);
+        self.name = self.name.transform(tw);
+    });
+
+    _(AST_Import, function(self, tw) {
+        if (self.imported_name) self.imported_name = self.imported_name.transform(tw);
+        if (self.imported_names) do_list(self.imported_names, tw);
+        self.module_name = self.module_name.transform(tw);
+    });
+
+    _(AST_Export, function(self, tw) {
+        if (self.exported_definition) self.exported_definition = self.exported_definition.transform(tw);
+        if (self.exported_value) self.exported_value = self.exported_value.transform(tw);
+        if (self.exported_names) do_list(self.exported_names, tw);
+        if (self.module_name) self.module_name = self.module_name.transform(tw);
+    });
+
+    _(AST_TemplateString, function(self, tw) {
+        self.segments = do_list(self.segments, tw);
+    });
+
+    _(AST_PrefixedTemplateString, function(self, tw) {
+        self.template_string = self.template_string.transform(tw);
+    });
+
+})();

lib/utils.js

@@ -1,7 +1,7 @@
 /***********************************************************************
 
   A JavaScript tokenizer / parser / beautifier / compressor.
-  https://github.com/mishoo/UglifyJS
+  https://github.com/mishoo/UglifyJS2
 
   -------------------------------- (C) ---------------------------------
 
@@ -45,23 +45,27 @@
 
 function characters(str) {
     return str.split("");
-}
+};
 
 function member(name, array) {
     return array.indexOf(name) >= 0;
-}
+};
 
 function find_if(func, array) {
-    for (var i = array.length; --i >= 0;) if (func(array[i])) return array[i];
-}
+    for (var i = 0, n = array.length; i < n; ++i) {
+        if (func(array[i]))
+            return array[i];
+    }
+};
 
 function repeat_string(str, i) {
     if (i <= 0) return "";
     if (i == 1) return str;
     var d = repeat_string(str, i >> 1);
     d += d;
-    return i & 1 ? d + str : d;
-}
+    if (i & 1) d += str;
+    return d;
+};
 
 function configure_error_stack(fn) {
     Object.defineProperty(fn.prototype, "stack", {
@@ -70,7 +74,7 @@ function configure_error_stack(fn) {
             err.name = this.name;
             try {
                 throw err;
-            } catch (e) {
+            } catch(e) {
                 return e.stack;
             }
         }
@@ -80,21 +84,27 @@ function configure_error_stack(fn) {
 function DefaultsError(msg, defs) {
     this.message = msg;
     this.defs = defs;
-}
+};
 DefaultsError.prototype = Object.create(Error.prototype);
 DefaultsError.prototype.constructor = DefaultsError;
 DefaultsError.prototype.name = "DefaultsError";
 configure_error_stack(DefaultsError);
 
+DefaultsError.croak = function(msg, defs) {
+    throw new DefaultsError(msg, defs);
+};
+
 function defaults(args, defs, croak) {
-    if (croak) for (var i in args) {
-        if (HOP(args, i) && !HOP(defs, i)) throw new DefaultsError("`" + i + "` is not a supported option", defs);
+    if (args === true)
+        args = {};
+    var ret = args || {};
+    if (croak) for (var i in ret) if (HOP(ret, i) && !HOP(defs, i))
+        DefaultsError.croak("`" + i + "` is not a supported option", defs);
+    for (var i in defs) if (HOP(defs, i)) {
+        ret[i] = (args && HOP(args, i)) ? args[i] : defs[i];
     }
-    for (var i in args) {
-        if (HOP(args, i)) defs[i] = args[i];
-    }
-    return defs;
-}
+    return ret;
+};
 
 function merge(obj, ext) {
     var count = 0;
@@ -103,7 +113,7 @@ function merge(obj, ext) {
         count++;
     }
     return count;
-}
+};
 
 function noop() {}
 function return_false() { return false; }
@@ -111,8 +121,8 @@ function return_true() { return true; }
 function return_this() { return this; }
 function return_null() { return null; }
 
-var List = (function() {
-    function List(a, f, backwards) {
+var MAP = (function(){
+    function MAP(a, f, backwards) {
         var ret = [], top = [], i;
         function doit() {
             var val = f(a[i], i);
@@ -125,7 +135,8 @@ var List = (function() {
                 } else {
                     top.push(val);
                 }
-            } else if (val !== skip) {
+            }
+            else if (val !== skip) {
                 if (val instanceof Splice) {
                     ret.push.apply(ret, backwards ? val.v.slice().reverse() : val.v);
                 } else {
@@ -133,8 +144,8 @@ var List = (function() {
                 }
             }
             return is_last;
-        }
-        if (Array.isArray(a)) {
+        };
+        if (a instanceof Array) {
             if (backwards) {
                 for (i = a.length; --i >= 0;) if (doit()) break;
                 ret.reverse();
@@ -142,59 +153,120 @@ var List = (function() {
             } else {
                 for (i = 0; i < a.length; ++i) if (doit()) break;
             }
-        } else {
+        }
+        else {
             for (i in a) if (HOP(a, i)) if (doit()) break;
         }
         return top.concat(ret);
-    }
-    List.is_op = function(val) {
-        return val === skip || val instanceof AtTop || val instanceof Last || val instanceof Splice;
     };
-    List.at_top = function(val) { return new AtTop(val); };
-    List.splice = function(val) { return new Splice(val); };
-    List.last = function(val) { return new Last(val); };
-    var skip = List.skip = {};
-    function AtTop(val) { this.v = val; }
-    function Splice(val) { this.v = val; }
-    function Last(val) { this.v = val; }
-    return List;
+    MAP.at_top = function(val) { return new AtTop(val) };
+    MAP.splice = function(val) { return new Splice(val) };
+    MAP.last = function(val) { return new Last(val) };
+    var skip = MAP.skip = {};
+    function AtTop(val) { this.v = val };
+    function Splice(val) { this.v = val };
+    function Last(val) { this.v = val };
+    return MAP;
 })();
 
 function push_uniq(array, el) {
-    if (array.indexOf(el) < 0) return array.push(el);
-}
+    if (array.indexOf(el) < 0)
+        array.push(el);
+};
 
 function string_template(text, props) {
-    return text.replace(/\{(.+?)\}/g, function(str, p) {
+    return text.replace(/\{(.+?)\}/g, function(str, p){
         return props && props[p];
     });
-}
+};
 
 function remove(array, el) {
-    var index = array.indexOf(el);
-    if (index >= 0) array.splice(index, 1);
-}
+    for (var i = array.length; --i >= 0;) {
+        if (array[i] === el) array.splice(i, 1);
+    }
+};
 
+function mergeSort(array, cmp) {
+    if (array.length < 2) return array.slice();
+    function merge(a, b) {
+        var r = [], ai = 0, bi = 0, i = 0;
+        while (ai < a.length && bi < b.length) {
+            cmp(a[ai], b[bi]) <= 0
+                ? r[i++] = a[ai++]
+                : r[i++] = b[bi++];
+        }
+        if (ai < a.length) r.push.apply(r, a.slice(ai));
+        if (bi < b.length) r.push.apply(r, b.slice(bi));
+        return r;
+    };
+    function _ms(a) {
+        if (a.length <= 1)
+            return a;
+        var m = Math.floor(a.length / 2), left = a.slice(0, m), right = a.slice(m);
+        left = _ms(left);
+        right = _ms(right);
+        return merge(left, right);
+    };
+    return _ms(array);
+};
+
+// this function is taken from Acorn [1], written by Marijn Haverbeke
+// [1] https://github.com/marijnh/acorn
 function makePredicate(words) {
-    if (!Array.isArray(words)) words = words.split(" ");
-    var map = Object.create(null);
-    words.forEach(function(word) {
-        map[word] = true;
-    });
-    return map;
-}
+    if (!(words instanceof Array)) words = words.split(" ");
+    var f = "", cats = [];
+    out: for (var i = 0; i < words.length; ++i) {
+        for (var j = 0; j < cats.length; ++j)
+            if (cats[j][0].length == words[i].length) {
+                cats[j].push(words[i]);
+                continue out;
+            }
+        cats.push([words[i]]);
+    }
+    function quote(word) {
+        return JSON.stringify(word).replace(/[\u2028\u2029]/g, function(s) {
+            switch (s) {
+                case "\u2028": return "\\u2028";
+                case "\u2029": return "\\u2029";
+            }
+            return s;
+        });
+    }
+    function compareTo(arr) {
+        if (arr.length == 1) return f += "return str === " + quote(arr[0]) + ";";
+        f += "switch(str){";
+        for (var i = 0; i < arr.length; ++i) f += "case " + quote(arr[i]) + ":";
+        f += "return true}return false;";
+    }
+    // When there are more than three length categories, an outer
+    // switch first dispatches on the lengths, to save on comparisons.
+    if (cats.length > 3) {
+        cats.sort(function(a, b) {return b.length - a.length;});
+        f += "switch(str.length){";
+        for (var i = 0; i < cats.length; ++i) {
+            var cat = cats[i];
+            f += "case " + cat[0].length + ":";
+            compareTo(cat);
+        }
+        f += "}";
+        // Otherwise, simply generate a flat `switch` statement.
+    } else {
+        compareTo(words);
+    }
+    return new Function("str", f);
+};
 
 function all(array, predicate) {
     for (var i = array.length; --i >= 0;)
-        if (!predicate(array[i], i))
+        if (!predicate(array[i]))
             return false;
     return true;
-}
+};
 
 function Dictionary() {
     this._values = Object.create(null);
     this._size = 0;
-}
+};
 Dictionary.prototype = {
     set: function(key, val) {
         if (!this.has(key)) ++this._size;
@@ -218,12 +290,6 @@ Dictionary.prototype = {
         return this;
     },
     has: function(key) { return ("$" + key) in this._values },
-    all: function(predicate) {
-        for (var i in this._values)
-            if (!predicate(this._values[i], i.substr(1)))
-                return false;
-        return true;
-    },
     each: function(f) {
         for (var i in this._values)
             f(this._values[i], i.substr(1));
@@ -237,13 +303,6 @@ Dictionary.prototype = {
             ret.push(f(this._values[i], i.substr(1)));
         return ret;
     },
-    clone: function() {
-        var ret = new Dictionary();
-        for (var i in this._values)
-            ret._values[i] = this._values[i];
-        ret._size = this._size;
-        return ret;
-    },
     toObject: function() { return this._values }
 };
 Dictionary.fromObject = function(obj) {
@@ -261,22 +320,20 @@ function HOP(obj, prop) {
 // a statement.
 function first_in_statement(stack) {
     var node = stack.parent(-1);
-    for (var i = 0, p; p = stack.parent(i++); node = p) {
-        if (p.TYPE == "Call") {
-            if (p.expression === node) continue;
-        } else if (p instanceof AST_Binary) {
-            if (p.left === node) continue;
-        } else if (p instanceof AST_Conditional) {
-            if (p.condition === node) continue;
-        } else if (p instanceof AST_PropAccess) {
-            if (p.expression === node) continue;
-        } else if (p instanceof AST_Sequence) {
-            if (p.expressions[0] === node) continue;
-        } else if (p instanceof AST_Statement) {
-            return p.body === node;
-        } else if (p instanceof AST_UnaryPostfix) {
-            if (p.expression === node) continue;
+    for (var i = 0, p; p = stack.parent(i); i++) {
+        if (p instanceof AST_Statement && p.body === node)
+            return true;
+        if ((p instanceof AST_Sequence      && p.expressions[0] === node) ||
+            (p.TYPE == "Call"               && p.expression === node ) ||
+            (p instanceof AST_Dot           && p.expression === node ) ||
+            (p instanceof AST_Sub           && p.expression === node ) ||
+            (p instanceof AST_Conditional   && p.condition === node  ) ||
+            (p instanceof AST_Binary        && p.left === node       ) ||
+            (p instanceof AST_UnaryPostfix  && p.expression === node ))
+        {
+            node = p;
+        } else {
+            return false;
         }
-        return false;
     }
 }

package.json

@@ -1,17 +1,20 @@
 {
-  "name": "uglify-js",
-  "description": "JavaScript parser, mangler/compressor and beautifier toolkit",
+  "name": "uglify-es",
+  "description": "JavaScript parser, mangler/compressor and beautifier toolkit for ES6+",
+  "homepage": "https://github.com/mishoo/UglifyJS2/tree/harmony",
   "author": "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)",
   "license": "BSD-2-Clause",
-  "version": "3.10.2",
+  "version": "3.3.4",
   "engines": {
     "node": ">=0.8.0"
   },
   "maintainers": [
-    "Alex Lam <alexlamsl@gmail.com>",
     "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)"
   ],
-  "repository": "mishoo/UglifyJS",
+  "repository": "git+https://github.com/mishoo/UglifyJS2.git#harmony",
+  "bugs": {
+    "url": "https://github.com/mishoo/UglifyJS2/issues"
+  },
   "main": "tools/node.js",
   "bin": {
     "uglifyjs": "bin/uglifyjs"
@@ -22,35 +25,34 @@
     "tools",
     "LICENSE"
   ],
+  "dependencies": {
+    "commander": "~2.12.1",
+    "source-map": "~0.6.1"
+  },
   "devDependencies": {
-    "acorn": "~7.1.0",
-    "semver": "~6.3.0"
+    "acorn": "~5.2.1",
+    "mocha": "~3.5.1",
+    "semver": "~5.4.1"
   },
   "scripts": {
-    "test": "node test/compress.js && node test/mocha.js"
+    "test": "node test/run-tests.js"
   },
   "keywords": [
-    "cli",
-    "compress",
-    "compressor",
-    "ecma",
-    "ecmascript",
-    "es",
-    "es5",
-    "javascript",
-    "js",
-    "jsmin",
-    "min",
-    "minification",
-    "minifier",
+    "uglify",
+    "uglify-es",
+    "uglify-js",
     "minify",
-    "optimize",
-    "optimizer",
-    "pack",
-    "packer",
-    "parse",
-    "parser",
-    "uglifier",
-    "uglify"
+    "minifier",
+    "javascript",
+    "ecmascript",
+    "es5",
+    "es6",
+    "es7",
+    "es8",
+    "es2015",
+    "es2016",
+    "es2017",
+    "async",
+    "await"
   ]
 }

test/benchmark.js

@@ -5,29 +5,29 @@
 
 var createHash = require("crypto").createHash;
 var fetch = require("./fetch");
-var spawn = require("child_process").spawn;
+var fork = require("child_process").fork;
 var zlib = require("zlib");
 var args = process.argv.slice(2);
-if (!args.length) args.push("-mc");
-args.unshift("bin/uglifyjs");
+if (!args.length) {
+    args.push("-mc");
+}
 args.push("--timings");
 var urls = [
-    "https://code.jquery.com/jquery-3.4.1.js",
-    "https://code.angularjs.org/1.7.8/angular.js",
-    "https://unpkg.com/mathjs@6.2.3/dist/math.js",
-    "https://unpkg.com/react@15.3.2/dist/react.js",
-    "https://cdnjs.cloudflare.com/ajax/libs/d3/5.12.0/d3.js",
+    "https://code.jquery.com/jquery-3.2.1.js",
+    "https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.4/angular.js",
+    "https://cdnjs.cloudflare.com/ajax/libs/mathjs/3.9.0/math.js",
     "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.js",
-    "https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.js",
-    "https://cdnjs.cloudflare.com/ajax/libs/ember.js/2.12.2/ember.prod.js",
-    "https://raw.githubusercontent.com/kangax/html-minifier/v4.0.0/dist/htmlminifier.js",
+    "https://unpkg.com/react@15.3.2/dist/react.js",
+    "http://builds.emberjs.com/tags/v2.11.0/ember.prod.js",
+    "https://cdn.jsdelivr.net/lodash/4.17.4/lodash.js",
+    "https://cdnjs.cloudflare.com/ajax/libs/d3/4.5.0/d3.js",
+    "https://raw.githubusercontent.com/kangax/html-minifier/v3.5.7/dist/htmlminifier.js",
 ];
 var results = {};
 var remaining = 2 * urls.length;
 function done() {
     if (!--remaining) {
         var failures = [];
-        var sum = { input: 0, output: 0, gzip: 0 };
         urls.forEach(function(url) {
             var info = results[url];
             console.log();
@@ -40,9 +40,6 @@ function done() {
             if (info.code) {
                 failures.push(url);
             }
-            sum.input += info.input;
-            sum.output += info.output;
-            sum.gzip += info.gzip;
         });
         if (failures.length) {
             console.error("Benchmark failed:");
@@ -50,13 +47,6 @@ function done() {
                 console.error(url);
             });
             process.exit(1);
-        } else {
-            console.log();
-            console.log("Subtotal");
-            console.log();
-            console.log("Original:", sum.input, "bytes");
-            console.log("Uglified:", sum.output, "bytes");
-            console.log("GZipped: ", sum.gzip, "bytes");
         }
     }
 }
@@ -69,20 +59,18 @@ urls.forEach(function(url) {
     };
     fetch(url, function(err, res) {
         if (err) throw err;
-        var uglifyjs = spawn(process.argv[0], args, { silent: true });
+        var uglifyjs = fork("bin/uglifyjs", args, { silent: true });
         res.on("data", function(data) {
             results[url].input += data.length;
         }).pipe(uglifyjs.stdin);
-        var sha1 = createHash("sha1");
         uglifyjs.stdout.on("data", function(data) {
             results[url].output += data.length;
         }).pipe(zlib.createGzip({
             level: zlib.Z_BEST_COMPRESSION
         })).on("data", function(data) {
             results[url].gzip += data.length;
-            sha1.update(data);
-        }).on("end", function() {
-            results[url].sha1 = sha1.digest("hex");
+        }).pipe(createHash("sha1")).on("data", function(data) {
+            results[url].sha1 = data.toString("hex");
             done();
         });
         uglifyjs.stderr.setEncoding("utf8");

test/compress.js

@@ -1,460 +0,0 @@
-"use strict";
-
-require("../tools/exit");
-
-var assert = require("assert");
-var child_process = require("child_process");
-var fs = require("fs");
-var path = require("path");
-var sandbox = require("./sandbox");
-var semver = require("semver");
-var U = require("./node");
-
-var file = process.argv[2];
-var dir = path.resolve(path.dirname(module.filename), "compress");
-if (file) {
-    var minify_options = require("./ufuzz/options.json").map(JSON.stringify);
-    log("--- {file}", { file: file });
-    var tests = parse_test(path.resolve(dir, file));
-    process.exit(Object.keys(tests).filter(function(name) {
-        return !test_case(tests[name]);
-    }).length);
-} else {
-    var files = fs.readdirSync(dir).filter(function(name) {
-        return /\.js$/i.test(name);
-    });
-    var failures = 0;
-    var failed_files = Object.create(null);
-    (function next() {
-        var file = files.shift();
-        if (file) {
-            child_process.spawn(process.argv[0], [ process.argv[1], file ], {
-                stdio: [ "ignore", 1, 2 ]
-            }).on("exit", function(code) {
-                if (code) {
-                    failures += code;
-                    failed_files[file] = code;
-                }
-                next();
-            });
-        } else if (failures) {
-            console.error();
-            console.error("!!! Failed " + failures + " test case(s).");
-            console.error("!!! " + Object.keys(failed_files).join(", "));
-            process.exit(1);
-        }
-    })();
-}
-
-function evaluate(code) {
-    if (code instanceof U.AST_Node) code = make_code(code, { beautify: true });
-    return new Function("return(" + code + ")")();
-}
-
-function log() {
-    console.log("%s", tmpl.apply(null, arguments));
-}
-
-function make_code(ast, options) {
-    var stream = U.OutputStream(options);
-    ast.print(stream);
-    return stream.get();
-}
-
-function parse_test(file) {
-    var script = fs.readFileSync(file, "utf8");
-    // TODO try/catch can be removed after fixing https://github.com/mishoo/UglifyJS/issues/348
-    try {
-        var ast = U.parse(script, {
-            filename: file
-        });
-    } catch (e) {
-        console.error("Caught error while parsing tests in " + file);
-        console.error(e);
-        process.exit(1);
-    }
-    var tests = Object.create(null);
-    var tw = new U.TreeWalker(function(node, descend) {
-        if (node instanceof U.AST_LabeledStatement
-            && tw.parent() instanceof U.AST_Toplevel) {
-            var name = node.label.name;
-            if (name in tests) {
-                throw new Error('Duplicated test name "' + name + '" in ' + file);
-            }
-            tests[name] = get_one_test(name, node.body);
-            return true;
-        }
-        if (!(node instanceof U.AST_Toplevel)) croak(node);
-    });
-    ast.walk(tw);
-    return tests;
-
-    function croak(node) {
-        throw new Error(tmpl("Can't understand test file {file} [{line},{col}]\n{code}", {
-            file: file,
-            line: node.start.line,
-            col: node.start.col,
-            code: make_code(node, { beautify: false })
-        }));
-    }
-
-    function read_string(stat) {
-        if (stat.TYPE == "SimpleStatement") {
-            var body = stat.body;
-            switch(body.TYPE) {
-              case "String":
-                return body.value;
-              case "Array":
-                return body.elements.map(function(element) {
-                    if (element.TYPE !== "String")
-                        throw new Error("Should be array of strings");
-                    return element.value;
-                }).join("\n");
-            }
-        }
-        throw new Error("Should be string or array of strings");
-    }
-
-    function get_one_test(name, block) {
-        var test = { name: name, options: {} };
-        var tw = new U.TreeWalker(function(node, descend) {
-            if (node instanceof U.AST_Assign) {
-                if (!(node.left instanceof U.AST_SymbolRef)) {
-                    croak(node);
-                }
-                var name = node.left.name;
-                test[name] = evaluate(node.right);
-                return true;
-            }
-            if (node instanceof U.AST_LabeledStatement) {
-                var label = node.label;
-                assert.ok([
-                    "input",
-                    "expect",
-                    "expect_exact",
-                    "expect_warnings",
-                    "expect_stdout",
-                    "node_version",
-                ].indexOf(label.name) >= 0, tmpl("Unsupported label {name} [{line},{col}]", {
-                    name: label.name,
-                    line: label.start.line,
-                    col: label.start.col
-                }));
-                var stat = node.body;
-                if (label.name == "expect_exact" || label.name == "node_version") {
-                    test[label.name] = read_string(stat);
-                } else if (label.name == "expect_stdout") {
-                    var body = stat.body;
-                    if (body instanceof U.AST_Boolean) {
-                        test[label.name] = body.value;
-                    } else if (body instanceof U.AST_Call) {
-                        var ctor = global[body.expression.name];
-                        assert.ok(ctor === Error || ctor.prototype instanceof Error, tmpl("Unsupported expect_stdout format [{line},{col}]", {
-                            line: label.start.line,
-                            col: label.start.col
-                        }));
-                        test[label.name] = ctor.apply(null, body.args.map(function(node) {
-                            assert.ok(node instanceof U.AST_Constant, tmpl("Unsupported expect_stdout format [{line},{col}]", {
-                                line: label.start.line,
-                                col: label.start.col
-                            }));
-                            return node.value;
-                        }));
-                    } else {
-                        test[label.name] = read_string(stat) + "\n";
-                    }
-                } else {
-                    test[label.name] = stat;
-                }
-                return true;
-            }
-        });
-        block.walk(tw);
-        return test;
-    }
-}
-
-// Try to reminify original input with standard options
-// to see if it matches expect_stdout.
-function reminify(orig_options, input_code, input_formatted, stdout) {
-    for (var i = 0; i < minify_options.length; i++) {
-        var options = JSON.parse(minify_options[i]);
-        if (options.compress) [
-            "keep_fargs",
-            "keep_fnames",
-        ].forEach(function(name) {
-            if (name in orig_options) {
-                options.compress[name] = orig_options[name];
-            }
-        });
-        var options_formatted = JSON.stringify(options, null, 4);
-        options.validate = true;
-        var result = U.minify(input_code, options);
-        if (result.error) {
-            log([
-                "!!! failed input reminify",
-                "---INPUT---",
-                "{input}",
-                "---OPTIONS---",
-                "{options}",
-                "--ERROR---",
-                "{error}",
-                "",
-                "",
-            ].join("\n"), {
-                input: input_formatted,
-                options: options_formatted,
-                error: result.error,
-            });
-            return false;
-        } else {
-            var toplevel = sandbox.has_toplevel(options);
-            var expected = stdout[toplevel ? 1 : 0];
-            var actual = run_code(result.code, toplevel);
-            if (typeof expected != "string" && typeof actual != "string" && expected.name == actual.name) {
-                actual = expected;
-            }
-            if (!sandbox.same_stdout(expected, actual)) {
-                log([
-                    "!!! failed running reminified input",
-                    "---INPUT---",
-                    "{input}",
-                    "---OPTIONS---",
-                    "{options}",
-                    "---OUTPUT---",
-                    "{output}",
-                    "---EXPECTED {expected_type}---",
-                    "{expected}",
-                    "---ACTUAL {actual_type}---",
-                    "{actual}",
-                    "",
-                    "",
-                ].join("\n"), {
-                    input: input_formatted,
-                    options: options_formatted,
-                    output: result.code,
-                    expected_type: typeof expected == "string" ? "STDOUT" : "ERROR",
-                    expected: expected,
-                    actual_type: typeof actual == "string" ? "STDOUT" : "ERROR",
-                    actual: actual,
-                });
-                return false;
-            }
-        }
-    }
-    return true;
-}
-
-function run_code(code, toplevel) {
-    var result = sandbox.run_code(code, toplevel);
-    return typeof result == "string" ? result.replace(/\u001b\[\d+m/g, "") : result;
-}
-
-function test_case(test) {
-    log("    Running test [{name}]", { name: test.name });
-    U.AST_Node.enable_validation();
-    var output_options = test.beautify || {};
-    var expect;
-    if (test.expect) {
-        expect = make_code(to_toplevel(test.expect, test.mangle), output_options);
-    } else {
-        expect = test.expect_exact;
-    }
-    var input = to_toplevel(test.input, test.mangle);
-    var input_code = make_code(input);
-    var input_formatted = make_code(test.input, {
-        beautify: true,
-        comments: "all",
-        keep_quoted_props: true,
-        quote_style: 3,
-    });
-    try {
-        input.validate_ast();
-        U.parse(input_code);
-    } catch (ex) {
-        log([
-            "!!! Cannot parse input",
-            "---INPUT---",
-            "{input}",
-            "--PARSE ERROR--",
-            "{error}",
-            "",
-            "",
-        ].join("\n"), {
-            input: input_formatted,
-            error: ex,
-        });
-        return false;
-    }
-    var warnings_emitted = [];
-    if (test.expect_warnings) {
-        var expected_warnings = make_code(test.expect_warnings, {
-            beautify: false,
-            quote_style: 2, // force double quote to match JSON
-        });
-        U.AST_Node.log_function(function(text) {
-            warnings_emitted.push(text);
-        }, /"INFO: /.test(expected_warnings));
-    }
-    if (test.mangle && test.mangle.properties && test.mangle.properties.keep_quoted) {
-        var quoted_props = test.mangle.properties.reserved;
-        if (!Array.isArray(quoted_props)) quoted_props = [];
-        test.mangle.properties.reserved = quoted_props;
-        U.reserve_quoted_keys(input, quoted_props);
-    }
-    if (test.rename) {
-        input.figure_out_scope(test.mangle);
-        input.expand_names(test.mangle);
-    }
-    var cmp = new U.Compressor(test.options, true);
-    var output = cmp.compress(input);
-    output.figure_out_scope(test.mangle);
-    if (test.mangle) {
-        output.compute_char_frequency(test.mangle);
-        output.mangle_names(test.mangle);
-        if (test.mangle.properties) U.mangle_properties(output, test.mangle.properties);
-    }
-    var output_code = make_code(output, output_options);
-    if (expect != output_code) {
-        log([
-            "!!! failed",
-            "---INPUT---",
-            "{input}",
-            "---OUTPUT---",
-            "{output}",
-            "---EXPECTED---",
-            "{expected}",
-            "",
-            "",
-        ].join("\n"), {
-            input: input_formatted,
-            output: output_code,
-            expected: expect
-        });
-        return false;
-    }
-    // expect == output
-    try {
-        output.validate_ast();
-        U.parse(output_code);
-    } catch (ex) {
-        log([
-            "!!! Test matched expected result but cannot parse output",
-            "---INPUT---",
-            "{input}",
-            "---OUTPUT---",
-            "{output}",
-            "--REPARSE ERROR--",
-            "{error}",
-            "",
-            "",
-        ].join("\n"), {
-            input: input_formatted,
-            output: output_code,
-            error: ex,
-        });
-        return false;
-    }
-    if (test.expect_warnings) {
-        warnings_emitted = warnings_emitted.map(function(input) {
-            return input.split(process.cwd() + path.sep).join("").split(path.sep).join("/");
-        });
-        var actual_warnings = JSON.stringify(warnings_emitted);
-        if (expected_warnings != actual_warnings) {
-            log([
-                "!!! failed",
-                "---INPUT---",
-                "{input}",
-                "---EXPECTED WARNINGS---",
-                "{expected_warnings}",
-                "---ACTUAL WARNINGS---",
-                "{actual_warnings}",
-                "",
-                "",
-            ].join("\n"), {
-                input: input_formatted,
-                expected_warnings: expected_warnings,
-                actual_warnings: actual_warnings,
-            });
-            return false;
-        }
-    }
-    if (test.expect_stdout && (!test.node_version || semver.satisfies(process.version, test.node_version))) {
-        var stdout = [ run_code(input_code), run_code(input_code, true) ];
-        var toplevel = sandbox.has_toplevel({
-            compress: test.options,
-            mangle: test.mangle
-        });
-        var actual = stdout[toplevel ? 1 : 0];
-        if (test.expect_stdout === true) {
-            test.expect_stdout = actual;
-        }
-        if (!sandbox.same_stdout(test.expect_stdout, actual)) {
-            log([
-                "!!! Invalid input or expected stdout",
-                "---INPUT---",
-                "{input}",
-                "---EXPECTED {expected_type}---",
-                "{expected}",
-                "---ACTUAL {actual_type}---",
-                "{actual}",
-                "",
-                "",
-            ].join("\n"), {
-                input: input_formatted,
-                expected_type: typeof test.expect_stdout == "string" ? "STDOUT" : "ERROR",
-                expected: test.expect_stdout,
-                actual_type: typeof actual == "string" ? "STDOUT" : "ERROR",
-                actual: actual,
-            });
-            return false;
-        }
-        actual = run_code(output_code, toplevel);
-        if (!sandbox.same_stdout(test.expect_stdout, actual)) {
-            log([
-                "!!! failed",
-                "---INPUT---",
-                "{input}",
-                "---EXPECTED {expected_type}---",
-                "{expected}",
-                "---ACTUAL {actual_type}---",
-                "{actual}",
-                "",
-                "",
-            ].join("\n"), {
-                input: input_formatted,
-                expected_type: typeof test.expect_stdout == "string" ? "STDOUT" : "ERROR",
-                expected: test.expect_stdout,
-                actual_type: typeof actual == "string" ? "STDOUT" : "ERROR",
-                actual: actual,
-            });
-            return false;
-        }
-        if (!reminify(test.options, input_code, input_formatted, stdout)) {
-            return false;
-        }
-    }
-    return true;
-}
-
-function tmpl() {
-    return U.string_template.apply(null, arguments);
-}
-
-function to_toplevel(input, mangle_options) {
-    if (!(input instanceof U.AST_BlockStatement)) throw new Error("Unsupported input syntax");
-    var directive = true;
-    var offset = input.start.line;
-    var tokens = [];
-    var toplevel = new U.AST_Toplevel(input.transform(new U.TreeTransformer(function(node) {
-        if (U.push_uniq(tokens, node.start)) node.start.line -= offset;
-        if (!directive || node === input) return;
-        if (node instanceof U.AST_SimpleStatement && node.body instanceof U.AST_String) {
-            return new U.AST_Directive(node.body);
-        } else {
-            directive = false;
-        }
-    })));
-    toplevel.figure_out_scope(mangle_options);
-    return toplevel;
-}

test/compress/arguments.js

@@ -1,785 +0,0 @@
-replace_index: {
-    options = {
-        arguments: true,
-        evaluate: true,
-        properties: true,
-    }
-    input: {
-        var arguments = [];
-        console.log(arguments[0]);
-        (function() {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-        (function(a, b) {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-        (function(arguments) {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-        (function() {
-            var arguments;
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-    }
-    expect: {
-        var arguments = [];
-        console.log(arguments[0]);
-        (function() {
-            console.log(arguments[1], arguments[1], arguments.foo);
-        })("bar", 42);
-        (function(a, b) {
-            console.log(b, b, arguments.foo);
-        })("bar", 42);
-        (function(arguments) {
-            console.log(arguments[1], arguments[1], arguments.foo);
-        })("bar", 42);
-        (function() {
-            var arguments;
-            console.log(arguments[1], arguments[1], arguments.foo);
-        })("bar", 42);
-    }
-    expect_stdout: [
-        "undefined",
-        "42 42 undefined",
-        "42 42 undefined",
-        "a a undefined",
-        "42 42 undefined",
-    ]
-}
-
-replace_index_strict: {
-    options = {
-        arguments: true,
-        evaluate: true,
-        properties: true,
-        reduce_vars: true,
-    }
-    input: {
-        "use strict";
-        (function() {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-        (function(a, b) {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-    }
-    expect: {
-        "use strict";
-        (function() {
-            console.log(arguments[1], arguments[1], arguments.foo);
-        })("bar", 42);
-        (function(a, b) {
-            console.log(b, b, arguments.foo);
-        })("bar", 42);
-    }
-    expect_stdout: [
-        "42 42 undefined",
-        "42 42 undefined",
-    ]
-}
-
-replace_index_keep_fargs: {
-    options = {
-        arguments: true,
-        evaluate: true,
-        keep_fargs: false,
-        properties: true,
-    }
-    input: {
-        var arguments = [];
-        console.log(arguments[0]);
-        (function() {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-        (function(a, b) {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-        (function(arguments) {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-        (function() {
-            var arguments;
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-    }
-    expect: {
-        var arguments = [];
-        console.log(arguments[0]);
-        (function(argument_0, argument_1) {
-            console.log(argument_1, argument_1, arguments.foo);
-        })("bar", 42);
-        (function(a, b) {
-            console.log(b, b, arguments.foo);
-        })("bar", 42);
-        (function(arguments) {
-            console.log(arguments[1], arguments[1], arguments.foo);
-        })("bar", 42);
-        (function() {
-            var arguments;
-            console.log(arguments[1], arguments[1], arguments.foo);
-        })("bar", 42);
-    }
-    expect_stdout: [
-        "undefined",
-        "42 42 undefined",
-        "42 42 undefined",
-        "a a undefined",
-        "42 42 undefined",
-    ]
-}
-
-replace_index_keep_fargs_strict: {
-    options = {
-        arguments: true,
-        evaluate: true,
-        keep_fargs: false,
-        properties: true,
-        reduce_vars: true,
-    }
-    input: {
-        "use strict";
-        (function() {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-        (function(a, b) {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-    }
-    expect: {
-        "use strict";
-        (function(argument_0, argument_1) {
-            console.log(argument_1, argument_1, arguments.foo);
-        })("bar", 42);
-        (function(a, b) {
-            console.log(b, b, arguments.foo);
-        })("bar", 42);
-    }
-    expect_stdout: [
-        "42 42 undefined",
-        "42 42 undefined",
-    ]
-}
-
-modified: {
-    options = {
-        arguments: true,
-    }
-    input: {
-        (function(a, b) {
-            var c = arguments[0];
-            var d = arguments[1];
-            var a = "foo";
-            b++;
-            arguments[0] = "moo";
-            arguments[1] *= 2;
-            console.log(a, b, c, d, arguments[0], arguments[1]);
-        })("bar", 42);
-    }
-    expect: {
-        (function(a, b) {
-            var c = a;
-            var d = b;
-            var a = "foo";
-            b++;
-            a = "moo";
-            b *= 2;
-            console.log(a, b, c, d, a, b);
-        })("bar", 42);
-    }
-    expect_stdout: "moo 86 bar 42 moo 86"
-}
-
-modified_strict: {
-    options = {
-        arguments: true,
-        reduce_vars: true,
-    }
-    input: {
-        "use strict";
-        (function(a, b) {
-            var c = arguments[0];
-            var d = arguments[1];
-            var a = "foo";
-            b++;
-            arguments[0] = "moo";
-            arguments[1] *= 2;
-            console.log(a, b, c, d, arguments[0], arguments[1]);
-        })("bar", 42);
-    }
-    expect: {
-        "use strict";
-        (function(a, b) {
-            var c = arguments[0];
-            var d = arguments[1];
-            var a = "foo";
-            b++;
-            arguments[0] = "moo";
-            arguments[1] *= 2;
-            console.log(a, b, c, d, arguments[0], arguments[1]);
-        })("bar", 42);
-    }
-    expect_stdout: "foo 43 bar 42 moo 84"
-}
-
-duplicate_argname: {
-    options = {
-        arguments: true,
-    }
-    input: {
-        (function(a, b, a) {
-            console.log(a, b, arguments[0], arguments[1], arguments[2]);
-        })("foo", 42, "bar");
-    }
-    expect: {
-        (function(a, b, a) {
-            console.log(a, b, arguments[0], b, a);
-        })("foo", 42, "bar");
-    }
-    expect_stdout: "bar 42 foo 42 bar"
-}
-
-issue_3273: {
-    options = {
-        arguments: true,
-    }
-    input: {
-        (function(a) {
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        })(0);
-    }
-    expect: {
-        (function(a) {
-            console.log(a, a);
-            a++;
-            console.log(a, a);
-        })(0);
-    }
-    expect_stdout: [
-        "0 0",
-        "1 1",
-    ]
-}
-
-issue_3273_no_call_arg: {
-    options = {
-        arguments: true,
-    }
-    input: {
-        (function(a) {
-            arguments[0] = "FAIL";
-            console.log(a);
-        })();
-    }
-    expect: {
-        (function(a) {
-            arguments[0] = "FAIL";
-            console.log(a);
-        })();
-    }
-    expect_stdout: "undefined"
-}
-
-issue_3273_reduce_vars: {
-    options = {
-        arguments: true,
-        reduce_vars: true,
-    }
-    input: {
-        (function(a) {
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        })(0);
-    }
-    expect: {
-        (function(a) {
-            console.log(a, a);
-            a++;
-            console.log(a, a);
-        })(0);
-    }
-    expect_stdout: [
-        "0 0",
-        "1 1",
-    ]
-}
-
-issue_3273_local_strict: {
-    options = {
-        arguments: true,
-    }
-    input: {
-        (function(a) {
-            "use strict";
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        })(0);
-    }
-    expect: {
-        (function(a) {
-            "use strict";
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        })(0);
-    }
-    expect_stdout: [
-        "0 0",
-        "1 0",
-    ]
-}
-
-issue_3273_local_strict_reduce_vars: {
-    options = {
-        arguments: true,
-        reduce_vars: true,
-    }
-    input: {
-        (function(a) {
-            "use strict";
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        })(0);
-    }
-    expect: {
-        (function(a) {
-            "use strict";
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        })(0);
-    }
-    expect_stdout: [
-        "0 0",
-        "1 0",
-    ]
-}
-
-issue_3273_global_strict: {
-    options = {
-        arguments: true,
-    }
-    input: {
-        "use strict";
-        (function(a) {
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        })(0);
-    }
-    expect: {
-        "use strict";
-        (function(a) {
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        })(0);
-    }
-    expect_stdout: [
-        "0 0",
-        "1 0",
-    ]
-}
-
-issue_3273_global_strict_reduce_vars: {
-    options = {
-        arguments: true,
-        reduce_vars: true,
-    }
-    input: {
-        "use strict";
-        (function(a) {
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        })(0);
-    }
-    expect: {
-        "use strict";
-        (function(a) {
-            console.log(arguments[0], a);
-            arguments[0]++;
-            console.log(arguments[0], a);
-        })(0);
-    }
-    expect_stdout: [
-        "0 0",
-        "1 0",
-    ]
-}
-
-issue_3273_keep_fargs_false: {
-    options = {
-        arguments: true,
-        keep_fargs: false,
-        reduce_vars: true,
-    }
-    input: {
-        (function() {
-            "use strict";
-            arguments[0]++;
-            console.log(arguments[0]);
-        })(0);
-    }
-    expect: {
-        (function(argument_0) {
-            "use strict";
-            argument_0++;
-            console.log(argument_0);
-        })(0);
-    }
-    expect_stdout: "1"
-}
-
-issue_3273_keep_fargs_strict: {
-    options = {
-        arguments: true,
-        keep_fargs: "strict",
-        reduce_vars: true,
-    }
-    input: {
-        (function() {
-            "use strict";
-            arguments[0]++;
-            console.log(arguments[0]);
-        })(0);
-    }
-    expect: {
-        (function(argument_0) {
-            "use strict";
-            argument_0++;
-            console.log(argument_0);
-        })(0);
-    }
-    expect_stdout: "1"
-}
-
-issue_3282_1: {
-    options = {
-        arguments: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        keep_fargs: false,
-        unused: true,
-    }
-    input: {
-        (function(t) {
-            return function() {
-                t();
-            };
-        })(function() {
-            'use strict';
-            function e() {
-                return arguments[0];
-            }
-            e();
-            e();
-        })();
-    }
-    expect: {
-        (function() {
-            return function() {
-                (function() {
-                    "use strict";
-                    function e() {
-                        return arguments[0];
-                    }
-                    e();
-                    e();
-                })();
-            };
-        })()();
-    }
-    expect_stdout: true
-}
-
-issue_3282_1_passes: {
-    options = {
-        arguments: true,
-        passes: 2,
-        reduce_funcs: true,
-        reduce_vars: true,
-        keep_fargs: false,
-        unused: true,
-    }
-    input: {
-        (function(t) {
-            return function() {
-                t();
-            };
-        })(function() {
-            'use strict';
-            function e() {
-                return arguments[0];
-            }
-            e();
-            e();
-        })();
-    }
-    expect: {
-        (function() {
-            return function() {
-                (function() {
-                    "use strict";
-                    function e(argument_0) {
-                        return argument_0;
-                    }
-                    e();
-                    e();
-                })();
-            };
-        })()();
-    }
-    expect_stdout: true
-}
-
-issue_3282_2: {
-    options = {
-        arguments: true,
-        reduce_vars: true,
-        keep_fargs: false,
-        unused: true,
-    }
-    input: {
-        (function(f) {
-            f();
-        })(function() {
-            return (function(t) {
-                return function() {
-                    t();
-                };
-            })(function() {
-                'use strict';
-                function e() {
-                    return arguments[0];
-                }
-                e();
-                e();
-            })();
-        });
-    }
-    expect: {
-        (function() {
-            (function() {
-                return function(t) {
-                    return function() {
-                        t();
-                    };
-                }(function() {
-                    "use strict";
-                    function e() {
-                        return arguments[0];
-                    }
-                    e();
-                    e();
-                })();
-            })();
-        })();
-    }
-    expect_stdout: true
-}
-
-issue_3282_2_passes: {
-    options = {
-        arguments: true,
-        passes: 2,
-        reduce_vars: true,
-        keep_fargs: false,
-        unused: true,
-    }
-    input: {
-        (function(f) {
-            f();
-        })(function() {
-            return (function(t) {
-                return function() {
-                    t();
-                };
-            })(function() {
-                'use strict';
-                function e() {
-                    return arguments[0];
-                }
-                e();
-                e();
-            })();
-        });
-    }
-    expect: {
-        (function() {
-            (function() {
-                return function(t) {
-                    return function() {
-                        t();
-                    };
-                }(function() {
-                    "use strict";
-                    function e(argument_0) {
-                        return argument_0;
-                    }
-                    e();
-                    e();
-                })();
-            })();
-        })();
-    }
-    expect_stdout: true
-}
-
-issue_3420_1: {
-    options = {
-        arguments: true,
-        keep_fargs: "strict",
-    }
-    input: {
-        console.log(function() {
-            return function() {
-                return arguments[0];
-            };
-        }().length);
-    }
-    expect: {
-        console.log(function() {
-            return function() {
-                return arguments[0];
-            };
-        }().length);
-    }
-    expect_stdout: "0"
-}
-
-issue_3420_2: {
-    options = {
-        arguments: true,
-        keep_fargs: "strict",
-    }
-    input: {
-        var foo = function() {
-            delete arguments[0];
-        };
-        foo();
-    }
-    expect: {
-        var foo = function() {
-            delete arguments[0];
-        };
-        foo();
-    }
-    expect_stdout: true
-}
-
-issue_3420_3: {
-    options = {
-        arguments: true,
-        keep_fargs: "strict",
-    }
-    input: {
-        "use strict";
-        var foo = function() {
-            delete arguments[0];
-        };
-        foo();
-    }
-    expect: {
-        "use strict";
-        var foo = function() {
-            delete arguments[0];
-        };
-        foo();
-    }
-    expect_stdout: true
-}
-
-issue_3420_4: {
-    options = {
-        arguments: true,
-        keep_fargs: "strict",
-    }
-    input: {
-        !function() {
-            console.log(arguments[0]);
-            delete arguments[0];
-            console.log(arguments[0]);
-        }(42);
-    }
-    expect: {
-        !function(argument_0) {
-            console.log(argument_0);
-            delete arguments[0];
-            console.log(arguments[0]);
-        }(42);
-    }
-    expect_stdout: [
-        "42",
-        "undefined",
-    ]
-}
-
-issue_3420_5: {
-    options = {
-        arguments: true,
-        keep_fargs: "strict",
-    }
-    input: {
-        "use strict";
-        !function() {
-            console.log(arguments[0]);
-            delete arguments[0];
-            console.log(arguments[0]);
-        }(42);
-    }
-    expect: {
-        "use strict";
-        !function(argument_0) {
-            console.log(argument_0);
-            delete arguments[0];
-            console.log(arguments[0]);
-        }(42);
-    }
-    expect_stdout: [
-        "42",
-        "undefined",
-    ]
-}
-
-issue_3420_6: {
-    options = {
-        arguments: true,
-        keep_fargs: "strict",
-    }
-    input: {
-        console.log(function() {
-            return delete arguments[0];
-        }());
-    }
-    expect: {
-        console.log(function() {
-            return delete arguments[0];
-        }());
-    }
-    expect_stdout: "true"
-}
-
-issue_3420_7: {
-    options = {
-        arguments: true,
-        keep_fargs: "strict",
-    }
-    input: {
-        "use strict";
-        console.log(function() {
-            return delete arguments[0];
-        }());
-    }
-    expect: {
-        "use strict";
-        console.log(function() {
-            return delete arguments[0];
-        }());
-    }
-    expect_stdout: "true"
-}

test/compress/arrays.js

@@ -1,3 +1,5 @@
+// NOTE trailing comma doesn't contribute to length of an array
+// That also means the array changes length if previous element is a hole too and got cut off
 holes_and_undefined: {
     input: {
         w = [1,,];
@@ -15,10 +17,9 @@ holes_and_undefined: {
 
 constant_join: {
     options = {
-        evaluate: true,
-        strings: true,
-        unsafe: true,
-    }
+        unsafe   : true,
+        evaluate : true
+    };
     input: {
         var a = [ "foo", "bar", "baz" ].join("");
         var a1 = [ "foo", "bar", "baz" ].join();
@@ -65,10 +66,9 @@ constant_join: {
 
 constant_join_2: {
     options = {
-        evaluate: true,
-        strings: true,
-        unsafe: true,
-    }
+        unsafe   : true,
+        evaluate : true
+    };
     input: {
         var a = [ "foo", "bar", boo(), "baz", "x", "y" ].join("");
         var b = [ "foo", "bar", boo(), "baz", "x", "y" ].join("-");
@@ -93,14 +93,85 @@ constant_join_2: {
     }
 }
 
+spread_with_variable_as_last_element: {
+    input: {
+        var values = [4, 5, 6];
+        var a = [1, 2, 3, ...values];
+    }
+    expect: {
+        var values = [4, 5, 6];
+        var a = [1, 2, 3, ...values];
+    }
+}
+
+spread_with_variable_in_middle: {
+    input: {
+        var values = [4, 5, 6];
+        var a = [1, 2, 3, ...values, 7,,,];
+    }
+    expect: {
+        var values = [4, 5, 6];
+        var a = [1, 2, 3, ...values, 7,,,];
+    }
+}
+
+spread_with_variable_at_front: {
+    input: {
+        var values = [1, 2, 3];
+        var a = [...values, 4, 5, 6];
+    }
+    expect: {
+        var values = [1, 2, 3];
+        var a = [...values, 4, 5, 6];
+    }
+}
+
+spread_with_variable_at_front_after_elisions: {
+    input: {
+        var values = [1, 2, 3];
+        var a = [,,,...values, 4, 5, 6];
+    }
+    expect: {
+        var values = [1, 2, 3];
+        var a = [,,,...values, 4, 5, 6];
+    }
+}
+
+spread_with_array_at_end: {
+    input: {
+        var a = [1, 2, ...[4, 5, 6]];
+    }
+    expect: {
+        var a = [1, 2, ...[4, 5, 6]];
+    }
+}
+
+spread_with_logical_expression_at_end: {
+    options = { evaluate: true }
+    input: {
+        var a = [1, 2, 3, ...[2+2]]
+    }
+    expect: {
+        var a = [1, 2, 3, ...[4]]
+    }
+}
+
+spread_with_logical_expression_at_middle: {
+    options = { evaluate: true }
+    input: {
+        var a = [1, 1, ...[1+1, 1+2, 2+3], 8]
+    }
+    expect: {
+        var a = [1, 1, ...[2, 3, 5], 8]
+    }
+}
+
 constant_join_3: {
     options = {
-        evaluate: true,
-        strings: true,
         unsafe: true,
-    }
+        evaluate: true,
+    };
     input: {
-        var foo, bar, baz;
         var a = [ null ].join();
         var b = [ , ].join();
         var c = [ , 1, , 3 ].join();
@@ -115,7 +186,6 @@ constant_join_3: {
         var l = [ foo, bar + "baz" ].join("");
     }
     expect: {
-        var foo, bar, baz;
         var a = "";
         var b = "";
         var c = ",1,,3";
@@ -138,7 +208,7 @@ for_loop: {
         reduce_vars: true,
         unsafe: true,
         unused: true,
-    }
+    };
     input: {
         function f0() {
             var a = [1, 2, 3];
@@ -244,113 +314,3 @@ index_length: {
     }
     expect_stdout: "1 2"
 }
-
-constructor_bad: {
-    options = {
-        unsafe: true
-    }
-    input: {
-        try {
-            Array(NaN);
-            console.log("FAIL1");
-        } catch (ex) {
-            try {
-                new Array(NaN);
-                console.log("FAIL2");
-            } catch (ex) {
-                console.log("PASS");
-            }
-        }
-        try {
-            Array(3.14);
-            console.log("FAIL1");
-        } catch (ex) {
-            try {
-                new Array(3.14);
-                console.log("FAIL2");
-            } catch (ex) {
-                console.log("PASS");
-            }
-        }
-    }
-    expect: {
-        try {
-            Array(NaN);
-            console.log("FAIL1");
-        } catch (ex) {
-            try {
-                Array(NaN);
-                console.log("FAIL2");
-            } catch (ex) {
-                console.log("PASS");
-            }
-        }
-        try {
-            Array(3.14);
-            console.log("FAIL1");
-        } catch (ex) {
-            try {
-                Array(3.14);
-                console.log("FAIL2");
-            } catch (ex) {
-                console.log("PASS");
-            }
-        }
-    }
-    expect_stdout: [
-        "PASS",
-        "PASS",
-    ]
-    expect_warnings: [
-        "WARN: Invalid array length: 3.14 [test/compress/arrays.js:13,12]",
-        "WARN: Invalid array length: 3.14 [test/compress/arrays.js:17,16]",
-    ]
-}
-
-constructor_good: {
-    options = {
-        unsafe: true
-    }
-    input: {
-        console.log(Array());
-        console.log(Array(0));
-        console.log(Array(1));
-        console.log(Array(6));
-        console.log(Array(7));
-        console.log(Array(1, 2));
-        console.log(Array(false));
-        console.log(Array("foo"));
-        console.log(Array(Array));
-        console.log(new Array());
-        console.log(new Array(0));
-        console.log(new Array(1));
-        console.log(new Array(6));
-        console.log(new Array(7));
-        console.log(new Array(1, 2));
-        console.log(new Array(false));
-        console.log(new Array("foo"));
-        console.log(new Array(Array));
-    }
-    expect: {
-        console.log([]);
-        console.log([]);
-        console.log([,]);
-        console.log([,,,,,,]);
-        console.log(Array(7));
-        console.log([ 1, 2 ]);
-        console.log([ false ]);
-        console.log([ "foo" ]);
-        console.log(Array(Array));
-        console.log([]);
-        console.log([]);
-        console.log([,]);
-        console.log([,,,,,,]);
-        console.log(Array(7));
-        console.log([ 1, 2 ]);
-        console.log([ false ]);
-        console.log([ "foo" ]);
-        console.log(Array(Array));
-    }
-    expect_stdout: true
-    expect_warnings: []
-}

test/compress/arrow.js

@@ -0,0 +1,656 @@
+arrow_functions_without_body: {
+    input: {
+        var a1 = () => 42;
+        var a2 = (p) => p;
+        var a3 = p => p;
+        var a4 = (...p) => p;
+        var a5 = (b, c) => b + c;
+        var a6 = (b, ...c) => b + c[0];
+        var a7 = (...b) => b.join();
+    }
+    expect: {
+        var a1 = () => 42;
+        var a2 = (p) => p;
+        var a3 = p => p;
+        var a4 = (...p) => p;
+        var a5 = (b, c) => b + c;
+        var a6 = (b, ...c) => b + c[0];
+        var a7 = (...b) => b.join();
+    }
+}
+
+arrow_functions_with_body: {
+    input: {
+        var a1 = () => {
+            var a = 42 * Math.random();
+            return a;
+        };
+        var a2 = (p) => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a3 = p => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a4 = (...p) => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a5 = (b, c) => {
+            var result = b * c + b / c;
+            return result
+        };
+        var a6 = (b, ...c) => {
+            var result = b;
+            for (var i = 0; i < c.length; i++)
+                result += c[i];
+            return result
+        };
+        var a7 = (...b) => {
+            b.join();
+        }
+    }
+    expect: {
+        var a1 = () => {
+            var a = 42 * Math.random();
+            return a;
+        };
+        var a2 = (p) => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a3 = p => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a4 = (...p) => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a5 = (b, c) => {
+            var result = b * c + b / c;
+            return result
+        };
+        var a6 = (b, ...c) => {
+            var result = b;
+            for (var i = 0; i < c.length; i++)
+                result += c[i];
+            return result
+        };
+        var a7 = (...b) => {
+            b.join();
+        };
+    }
+}
+
+arrow_function_with_single_parameter_with_default: {
+    input: {
+        var foo = (a = 0) => doSomething(a);
+    }
+    expect_exact: "var foo=(a=0)=>doSomething(a);"
+}
+
+arrow_binding_pattern: {
+    input: {
+        var foo = ([]) => "foo";
+        var bar = ({}) => "bar";
+        var with_default = (foo = "default") => foo;
+        var object_with_default = ({foo = "default", bar: baz = "default"}) => foo;
+        var array_after_spread = (...[foo]) => foo;
+        var array_after_spread = (...{foo}) => foo;
+        var computed = ({ [compute()]: x }) => {};
+        var array_hole = ([, , ...x] = [1, 2]) => {};
+        var object_trailing_elision = ({foo,}) => {};
+        var spread_empty_array = (...[]) => "foo";
+        var spread_empty_object = (...{}) => "foo";
+    }
+    expect: {
+        var foo = ([]) => "foo";
+        var bar = ({}) => "bar";
+        var with_default = (foo = "default") => foo;
+        var object_with_default = ({foo = "default", bar: baz = "default"}) => foo;
+        var array_after_spread = (...[foo]) => foo;
+        var array_after_spread = (...{foo}) => foo;
+        var computed = ({ [compute()]: x }) => {};
+        var array_hole = ([, , ...x] = [1, 2]) => {};
+        var object_trailing_elision = ({foo,}) => {};
+        var spread_empty_array = (...[]) => "foo";
+        var spread_empty_object = (...{}) => "foo";
+    }
+}
+
+arrow_binding_pattern_strict: {
+    input: {
+        var foo = ([,]) => "foo";
+    }
+    expect_exact: 'var foo=([,])=>"foo";'
+}
+
+arrow_with_regexp: {
+    input: {
+        num => /\d{11,14}/.test( num )
+    }
+    expect: {
+        num => /\d{11,14}/.test( num )
+    }
+}
+
+arrow_unused: {
+    options = {
+        toplevel: false,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        top => dog;
+        let fn = a => { console.log(a * a); };
+        let u = (x, y) => x - y + g;
+        (() => { console.log("0"); })();
+        !function(x) {
+            (() => { console.log("1"); })();
+            let unused = x => { console.log(x); };
+            let baz = e => e + e;
+            console.log(baz(x));
+        }(1);
+        fn(3);
+    }
+    expect: {
+        let fn = a => { console.log(a * a); };
+        let u = (x, y) => x - y + g;
+        (() => { console.log("0"); })();
+        !function(x) {
+            (() => { console.log("1"); })();
+            let baz = e => e + e;
+            console.log(baz(x));
+        }(1);
+        fn(3);
+    }
+    expect_stdout: [ "0", "1", "2", "9" ]
+    node_version: ">=6"
+}
+
+arrow_unused_toplevel: {
+    options = {
+        toplevel: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        top => dog;
+        let fn = a => { console.log(a * a); };
+        let u = (x, y) => x - y + g;
+        (() => { console.log("0"); })();
+        !function(x) {
+            (() => { console.log("1"); })();
+            let unused = x => { console.log(x); };
+            let baz = e => e + e;
+            console.log(baz(x));
+        }(1);
+        fn(3);
+    }
+    expect: {
+        let fn = a => { console.log(a * a); };
+        (() => { console.log("0"); })();
+        !function(x) {
+            (() => { console.log("1"); })();
+            let baz = e => e + e;
+            console.log(baz(x));
+        }(1);
+        fn(3);
+    }
+    expect_stdout: [ "0", "1", "2", "9" ]
+    node_version: ">=6"
+}
+
+no_leading_parentheses: {
+    input: {
+        (x,y) => x(y);
+        async (x,y) => await x(y);
+    }
+    expect_exact: "(x,y)=>x(y);async(x,y)=>await x(y);"
+}
+
+async_identifiers: {
+    options = {
+        unsafe_arrows: true,
+        ecma: 6,
+    }
+    input: {
+        var async = function(x){ console.log("async", x); };
+        var await = function(x){ console.log("await", x); };
+        async(1);
+        await(2);
+    }
+    expect: {
+        var async = x => { console.log("async", x); };
+        var await = x => { console.log("await", x); };
+        async(1);
+        await(2);
+    }
+    expect_stdout: [
+        "async 1",
+        "await 2",
+    ]
+    node_version: ">=4"
+}
+
+async_function_expression: {
+    options = {
+        unsafe_arrows: true,
+        ecma: 6,
+        evaluate: true,
+        side_effects: true,
+    }
+    input: {
+        var named = async function foo() {
+            await bar(1 + 0) + (2 + 0);
+        }
+        var anon = async function() {
+            await (1 + 0) + bar(2 + 0);
+        }
+    }
+    expect: {
+        var named = async function foo() {
+            await bar(1);
+        };
+        var anon = async () => {
+            await 1, bar(2);
+        };
+    }
+}
+
+issue_27: {
+    options = {
+        unsafe_arrows: true,
+        collapse_vars: true,
+        ecma: 6,
+        unused: true,
+    }
+    input: {
+        (function(jQuery) {
+            var $;
+            $ = jQuery;
+            $("body").addClass("foo");
+        })(jQuery);
+    }
+    expect: {
+        (jQuery => {
+            jQuery("body").addClass("foo");
+        })(jQuery);
+    }
+}
+
+issue_2105_1: {
+    options = {
+        unsafe_arrows: true,
+        collapse_vars: true,
+        ecma: 6,
+        inline: true,
+        passes: 3,
+        reduce_funcs: true,
+        reduce_vars: true,
+        side_effects: true,
+        unsafe_methods: true,
+        unused: true,
+    }
+    input: {
+        !function(factory) {
+            factory();
+        }( function() {
+            return function(fn) {
+                fn()().prop();
+            }( function() {
+                function bar() {
+                    var quux = function() {
+                        console.log("PASS");
+                    }, foo = function() {
+                        console.log;
+                        quux();
+                    };
+                    return { prop: foo };
+                }
+                return bar;
+            } );
+        });
+    }
+    expect: {
+        ({
+            prop() {
+                console.log;
+                console.log("PASS");
+            }
+        }).prop();
+    }
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
+issue_2105_2: {
+    options = {
+        collapse_vars: true,
+        inline: true,
+        passes: 2,
+        reduce_funcs: true,
+        reduce_vars: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        ((factory) => {
+            factory();
+        })( () => {
+            return ((fn) => {
+                fn()().prop();
+            })( () => {
+                let bar = () => {
+                    var quux = () => {
+                        console.log("PASS");
+                    }, foo = () => {
+                        console.log;
+                        quux();
+                    };
+                    return { prop: foo };
+                };
+                return bar;
+            } );
+        });
+    }
+    expect: {
+        ({
+            prop: () => {
+                console.log;
+                console.log("PASS");
+            }
+        }).prop();
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+issue_2136_2: {
+    options = {
+        arrows: true,
+        collapse_vars: true,
+        ecma: 6,
+        inline: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        function f(x) {
+            console.log(x);
+        }
+        !function(a, ...b) {
+            f(b[0]);
+        }(1, 2, 3);
+    }
+    expect: {
+        function f(x) {
+            console.log(x);
+        }
+        f([2,3][0]);
+    }
+    expect_stdout: "2"
+    node_version: ">=6"
+}
+
+issue_2136_3: {
+    options = {
+        arrows: true,
+        collapse_vars: true,
+        ecma: 6,
+        evaluate: true,
+        inline: true,
+        passes: 3,
+        reduce_funcs: true,
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unsafe: true,
+        unused: true,
+    }
+    input: {
+        function f(x) {
+            console.log(x);
+        }
+        !function(a, ...b) {
+            f(b[0]);
+        }(1, 2, 3);
+    }
+    expect: {
+        console.log(2);
+    }
+    expect_stdout: "2"
+    node_version: ">=6"
+}
+
+call_args: {
+    options = {
+        arrows: true,
+        ecma: 6,
+        evaluate: true,
+        inline: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+    }
+    input: {
+        const a = 1;
+        console.log(a);
+        +function(a) {
+            return a;
+        }(a);
+    }
+    expect: {
+        const a = 1;
+        console.log(1);
+        +(1, 1);
+    }
+    expect_stdout: true
+}
+
+call_args_drop_param: {
+    options = {
+        arrows: true,
+        ecma: 6,
+        evaluate: true,
+        inline: true,
+        keep_fargs: false,
+        reduce_funcs: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        const a = 1;
+        console.log(a);
+        +function(a) {
+            return a;
+        }(a, b);
+    }
+    expect: {
+        const a = 1;
+        console.log(1);
+        +(b, 1);
+    }
+    expect_stdout: true
+}
+
+issue_485_crashing_1530: {
+    options = {
+        arrows: true,
+        conditionals: true,
+        dead_code: true,
+        ecma: 6,
+        evaluate: true,
+        inline: true,
+        side_effects: true,
+    }
+    input: {
+        (function(a) {
+            if (true) return;
+            var b = 42;
+        })(this);
+    }
+    expect: {}
+}
+
+issue_2084: {
+    options = {
+        unsafe_arrows: true,
+        collapse_vars: true,
+        conditionals: true,
+        ecma: 6,
+        evaluate: true,
+        inline: true,
+        passes: 2,
+        reduce_funcs: true,
+        reduce_vars: true,
+        sequences: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        var c = 0;
+        !function() {
+            !function(c) {
+                c = 1 + c;
+                var c = 0;
+                function f14(a_1) {
+                    if (c = 1 + c, 0 !== 23..toString())
+                        c = 1 + c, a_1 && (a_1[0] = 0);
+                }
+                f14();
+            }(-1);
+        }();
+        console.log(c);
+    }
+    expect: {
+        var c = 0;
+        ((c) => {
+            c = 1 + c,
+            c = 1 + (c = 0),
+            0 !== 23..toString() && (c = 1 + c);
+        })(-1),
+        console.log(c);
+    }
+    expect_stdout: "0"
+    node_version: ">=4"
+}
+
+export_default_object_expression: {
+    options = {
+        arrows: true,
+        evaluate: true,
+    }
+    input: {
+        export default {
+            foo: 1 + 2,
+            bar() { return 4; },
+            get baz() { return this.foo; },
+        };
+    }
+    expect_exact: "export default{foo:3,bar:()=>4,get baz(){return this.foo}};"
+}
+
+concise_methods_with_computed_property2: {
+    options = {
+        arrows: true,
+        evaluate: true,
+    }
+    input: {
+        var foo = {
+            [[1]](v) {
+                return v;
+            }
+        };
+        console.log(foo[[1]]("PASS"));
+    }
+    expect_exact: 'var foo={[[1]]:v=>v};console.log(foo[[1]]("PASS"));'
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
+async_object_literal: {
+    options = {
+        arrows: true,
+        unsafe_arrows: true,
+        ecma: 6,
+        evaluate: true,
+    }
+    input: {
+        var obj = {
+            async a() {
+                return await foo(1 + 0);
+            },
+            anon: async function() {
+                return await foo(2 + 0);
+            }
+        };
+    }
+    expect: {
+        var obj = {
+            a: async () => await foo(1),
+            anon: async () => await foo(2)
+        };
+    }
+}
+
+issue_2271: {
+    options = {
+        arrows: true,
+        ecma: 6,
+        evaluate: true,
+        unsafe_arrows: false,
+    }
+    input: {
+        var Foo = function() {};
+        Foo.prototype.set = function(value) {
+            this.value = value;
+            return this;
+        }
+        Foo.prototype.print = function() {
+            console.log(this.value);
+        }
+        new Foo().set("PASS").print();
+    }
+    expect: {
+        var Foo = function() {};
+        Foo.prototype.set = function(value) {
+            this.value = value;
+            return this;
+        }
+        Foo.prototype.print = function() {
+            console.log(this.value);
+        }
+        new Foo().set("PASS").print();
+    }
+    expect_stdout: "PASS"
+}
+
+concise_method_with_super: {
+    options = {
+        arrows: true,
+    }
+    input: {
+        var o = {
+            f: "FAIL",
+            g() {
+                return super.f;
+            }
+        }
+        Object.setPrototypeOf(o, { f: "PASS" });
+        console.log(o.g());
+    }
+    expect: {
+        var o = {
+            f: "FAIL",
+            g() {
+                return super.f;
+            }
+        }
+        Object.setPrototypeOf(o, { f: "PASS" });
+        console.log(o.g());
+    }
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}

test/compress/asm.js

@@ -1,25 +1,24 @@
 asm_mixed: {
     options = {
-        assignments: true,
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        drop_debugger: true,
-        evaluate: true,
-        hoist_funs: true,
-        hoist_vars: true,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
-        keep_fnames: false,
-        loops: true,
-        negate_iife: true,
-        properties: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
-    }
+        sequences     : true,
+        properties    : true,
+        dead_code     : true,
+        drop_debugger : true,
+        conditionals  : true,
+        comparisons   : true,
+        evaluate      : true,
+        booleans      : true,
+        loops         : true,
+        unused        : true,
+        hoist_funs    : true,
+        keep_fargs    : true,
+        keep_fnames   : false,
+        hoist_vars    : true,
+        if_return     : true,
+        join_vars     : true,
+        side_effects  : true,
+        negate_iife   : true
+    };
     input: {
         // adapted from http://asmjs.org/spec/latest/
         function asm_GeometricMean(stdlib, foreign, buffer) {
@@ -91,11 +90,12 @@ asm_mixed: {
         function no_asm_GeometricMean(stdlib, foreign, buffer) {
             function logSum(start, end) {
                 start |= 0, end |= 0;
-                for (var sum = 0, p = 0, q = 0, p = start << 3, q = end << 3; (0 | p) < (0 | q); p = p + 8 | 0) sum += +log(values[p >> 3]);
+                var sum = 0, p = 0, q = 0;
+                for (p = start << 3, q = end << 3; (0 | p) < (0 | q); p = p + 8 | 0) sum += +log(values[p >> 3]);
                 return +sum;
             }
             function geometricMean(start, end) {
-                return start |= 0, end |= 0, +exp(logSum(start, end) / (end - start | 0));
+                return start |= 0, end |= 0, +exp(+logSum(start, end) / +(end - start | 0));
             }
             var exp = stdlib.Math.exp, log = stdlib.Math.log, values = new stdlib.Float64Array(buffer);
             return { geometricMean: geometricMean };
@@ -165,69 +165,3 @@ asm_nested_functions: {
     }
     expect_exact: '0;function a(){"use asm";0.0}0;function b(){0;function c(){"use asm";0.0}0;function d(){0}0}0;'
 }
-
-issue_3636_1: {
-    mangle = {}
-    input: {
-        function n(stdlib, foreign, buffer) {
-            "use asm";
-            function add(x, y) {
-                x = x | 0;
-                y = y | 0;
-                return x + y | 0;
-            }
-            return {
-                add: add
-            };
-        }
-        console.log(new n().add("foo", 42));
-    }
-    expect: {
-        function n(o, e, u) {
-            "use asm";
-            function d(n, o) {
-                n = n | 0;
-                o = o | 0;
-                return n + o | 0;
-            }
-            return {
-                add: d
-            };
-        }
-        console.log(new n().add("foo", 42));
-    }
-    expect_stdout: "42"
-}
-
-issue_3636_2: {
-    mangle = {}
-    input: {
-        var n = function(stdlib, foreign, buffer) {
-            "use asm";
-            function add(x, y) {
-                x = x | 0;
-                y = y | 0;
-                return x + y | 0;
-            }
-            return {
-                add: add
-            };
-        };
-        console.log(new n().add("foo", 42));
-    }
-    expect: {
-        var n = function(n, o, e) {
-            "use asm";
-            function r(n, o) {
-                n = n | 0;
-                o = o | 0;
-                return n + o | 0;
-            }
-            return {
-                add: r
-            };
-        };
-        console.log(new n().add("foo", 42));
-    }
-    expect_stdout: "42"
-}

test/compress/assignment.js

@@ -1,6 +1,5 @@
 op_equals_left_local_var: {
     options = {
-        assignments: true,
         evaluate: true,
     }
     input: {
@@ -61,7 +60,6 @@ op_equals_left_local_var: {
 
 op_equals_right_local_var: {
     options = {
-        assignments: true,
         evaluate: true,
     }
     input: {
@@ -125,7 +123,6 @@ op_equals_right_local_var: {
 }
 op_equals_left_global_var: {
     options = {
-        assignments: true,
         evaluate: true,
     }
     input: {
@@ -182,7 +179,6 @@ op_equals_left_global_var: {
 
 op_equals_right_global_var: {
     options = {
-        assignments: true,
         evaluate: true,
     }
     input: {
@@ -240,224 +236,3 @@ op_equals_right_global_var: {
         x = g() &   x;
     }
 }
-
-increment_decrement_1: {
-    options = {
-        assignments: true,
-        reduce_vars: true,
-    }
-    input: {
-        console.log(function(a) {
-            a += 1;
-            a -= 1;
-            return a;
-        }(42));
-    }
-    expect: {
-        console.log(function(a){
-            ++a;
-            --a;
-            return a;
-        }(42));
-    }
-    expect_stdout: "42"
-}
-
-increment_decrement_2: {
-    options = {
-        assignments: true,
-        passes: 2,
-        reduce_vars: true,
-    }
-    input: {
-        console.log(function(a) {
-            a = a + 1;
-            a = a - 1;
-            a += 1;
-            a -= 1;
-            return a;
-        }(42));
-    }
-    expect: {
-        console.log(function(a){
-            ++a;
-            --a;
-            ++a;
-            --a;
-            return a;
-        }(42));
-    }
-    expect_stdout: "42"
-}
-
-issue_3375_1: {
-    options = {
-        assignments: true,
-        reduce_vars: true,
-    }
-    input: {
-        function p(o) {
-            console.log(typeof o, o);
-        }
-        p(function(b) {
-            var a = b += 1;
-            --b;
-            return a;
-        }("object"));
-    }
-    expect: {
-        function p(o) {
-            console.log(typeof o, o);
-        }
-        p(function(b) {
-            var a = b += 1;
-            --b;
-            return a;
-        }("object"));
-    }
-    expect_stdout: "string object1"
-}
-
-issue_3375_2: {
-    options = {
-        assignments: true,
-        reduce_vars: true,
-    }
-    input: {
-        function p(o) {
-            console.log(typeof o, o);
-        }
-        p(function(b) {
-            var a = b -= 1;
-            --b;
-            return a;
-        }("object"));
-    }
-    expect: {
-        function p(o) {
-            console.log(typeof o, o);
-        }
-        p(function(b) {
-            var a = --b;
-            --b;
-            return a;
-        }("object"));
-    }
-    expect_stdout: "number NaN"
-}
-
-issue_3427: {
-    options = {
-        assignments: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        (function() {
-            var a;
-            a || (a = {});
-        })();
-    }
-    expect: {}
-}
-
-issue_3429_1: {
-    options = {
-        assignments: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        var a = "PASS";
-        (function(b) {
-            b && (b = a = "FAIL");
-        })();
-        console.log(a);
-    }
-    expect: {
-        var a = "PASS";
-        (function(b) {
-            b = b && (a = "FAIL");
-        })();
-        console.log(a);
-    }
-    expect_stdout: "PASS"
-}
-
-issue_3429_2: {
-    options = {
-        assignments: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        var a;
-        (function(b) {
-            b || (b = a = "FAIL");
-        })(42);
-        console.log(a);
-    }
-    expect: {
-        var a;
-        (function(b) {
-            b = b || (a = "FAIL");
-        })(42);
-        console.log(a);
-    }
-    expect_stdout: "undefined"
-}
-
-issue_3949_1: {
-    options = {
-        assignments: true,
-        evaluate: true,
-        reduce_vars: true,
-    }
-    input: {
-        var a = 42;
-        function f() {
-            var b = a;
-            b = b >> 2;
-            return 100 + b;
-        }
-        console.log(f());
-    }
-    expect: {
-        var a = 42;
-        function f() {
-            var b = a;
-            b >>= 2;
-            return 100 + b;
-        }
-        console.log(f());
-    }
-    expect_stdout: "110"
-}
-
-issue_3949_2: {
-    options = {
-        assignments: true,
-        evaluate: true,
-        reduce_vars: true,
-    }
-    input: {
-        var a = 42;
-        function f() {
-            var b = a;
-            b = 5 & b;
-            return 100 + b;
-        }
-        console.log(f());
-    }
-    expect: {
-        var a = 42;
-        function f() {
-            var b = a;
-            b &= 5;
-            return 100 + b;
-        }
-        console.log(f());
-    }
-    expect_stdout: "100"
-}

test/compress/async.js

@@ -0,0 +1,323 @@
+await_precedence: {
+    input: {
+        async function f1() { await x + y; }
+        async function f2() { await (x + y); }
+    }
+    expect_exact: "async function f1(){await x+y}async function f2(){await(x+y)}"
+}
+
+await_precedence_prop: {
+    input: {
+        async function f1(){ return (await foo()).bar; }
+        async function f2(){ return (await foo().bar); }
+    }
+    expect_exact: "async function f1(){return(await foo()).bar}async function f2(){return await foo().bar}"
+}
+
+await_precedence_call: {
+    input: {
+        async function f3(){ return (await foo())(); }
+        async function f4(){ return await (foo()()); }
+    }
+    expect_exact: "async function f3(){return(await foo())()}async function f4(){return await foo()()}"
+}
+
+async_function_declaration: {
+    options = {
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        async function f0() {}
+        async function f1() { await x + y; }
+        async function f2() { await (x + y); }
+        async function f3() { await x + await y; }
+        async function f4() { await (x + await y); }
+        async function f5() { await x; await y; }
+        async function f6() { await x, await y; }
+    }
+    expect: {
+        async function f0() {}
+        async function f1() { await x, y; }
+        async function f2() { await (x + y); }
+        async function f3() { await x, await y; }
+        async function f4() { await (x + await y); }
+        async function f5() { await x; await y; }
+        async function f6() { await x, await y; }
+    }
+}
+
+async_function_expression: {
+    options = {
+        evaluate: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        var named = async function foo() {
+            await bar(1 + 0) + (2 + 0);
+        }
+        var anon = async function() {
+            await (1 + 0) + bar(2 + 0);
+        }
+    }
+    expect: {
+        var named = async function() {
+            await bar(1);
+        };
+        var anon = async function() {
+            await 1, bar(2);
+        };
+    }
+}
+
+async_class: {
+    options = {
+        evaluate: true,
+    }
+    input: {
+        class Foo {
+            async m1() {
+                return await foo(1 + 2);
+            }
+            static async m2() {
+                return await foo(3 + 4);
+            }
+        }
+    }
+    expect: {
+        class Foo {
+            async m1() {
+                return await foo(3);
+            }
+            static async m2() {
+                return await foo(7);
+            }
+        }
+    }
+}
+
+async_object_literal: {
+    options = {
+        evaluate: true,
+    }
+    input: {
+        var obj = {
+            async a() {
+                await foo(1 + 0);
+            },
+            anon: async function(){
+                await foo(2 + 0);
+            }
+        };
+    }
+    expect: {
+        var obj = {
+            async a() {
+                await foo(1);
+            },
+            anon: async function() {
+                await foo(2);
+            }
+        };
+    }
+}
+
+async_export: {
+    input: {
+        export async function run() {};
+        export default async function def() {};
+    }
+    expect: {
+        export async function run() {};
+        export default async function def() {};
+    }
+}
+
+async_inline: {
+    options = {
+        collapse_vars: true,
+        conditionals: true,
+        evaluate: true,
+        inline: true,
+        negate_iife: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        (async function(){ return await 3; })();
+        (async function(x){ await console.log(x); })(4);
+
+        function echo(x) { return x; }
+        echo( async function(){ return await 1; }() );
+        echo( async function(x){ await console.log(x); }(2) );
+
+        function top() { console.log("top"); }
+        top();
+
+        async function async_top() { console.log("async_top"); }
+        async_top();
+    }
+    expect: {
+        !async function(){await 3}();
+        !async function(x){await console.log(4)}();
+
+        function echo(x){return x}
+        echo(async function(){return await 1}());
+        echo(async function(x){await console.log(2)}());
+
+        console.log("top");
+
+        !async function(){console.log("async_top")}();
+    }
+    expect_stdout: [
+        "4",
+        "2",
+        "top",
+        "async_top",
+    ]
+    node_version: ">=8"
+}
+
+async_identifiers: {
+    input: {
+        var async = function(x){ console.log("async", x); };
+        var await = function(x){ console.log("await", x); };
+        async(1);
+        await(2);
+    }
+    expect: {
+        var async = function(x){ console.log("async", x); };
+        var await = function(x){ console.log("await", x); };
+        async(1);
+        await(2);
+    }
+    expect_stdout: [
+        "async 1",
+        "await 2",
+    ]
+}
+
+async_shorthand_property: {
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        function print(o) { console.log(o.async + " " + o.await); }
+        var async = "Async", await = "Await";
+
+        print({ async });
+        print({ await });
+        print({ async, await });
+        print({ await, async });
+
+        print({ async: async });
+        print({ await: await });
+        print({ async: async, await: await });
+        print({ await: await, async: async });
+    }
+    expect: {
+        function a(a) { console.log(a.async + " " + a.await); }
+        var n = "Async", c = "Await";
+
+        a({ async: n });
+        a({ await: c });
+        a({ async: n, await: c });
+        a({ await: c, async: n });
+
+        a({ async: n });
+        a({ await: c });
+        a({ async: n, await: c });
+        a({ await: c, async: n });
+    }
+    expect_stdout: [
+        "Async undefined",
+        "undefined Await",
+        "Async Await",
+        "Async Await",
+        "Async undefined",
+        "undefined Await",
+        "Async Await",
+        "Async Await",
+    ]
+    node_version: ">=4"
+}
+
+async_arrow: {
+    input: {
+        let a1 = async x => await foo(x);
+        let a2 = async () => await bar();
+        let a3 = async (x) => await baz(x);
+        let a4 = async (x, y) => { await far(x, y); }
+        let a5 = async ({x = [1], y: z = 2}) => { await wow(x, z); }
+    }
+    expect: {
+        let a1 = async x => await foo(x);
+        let a2 = async () => await bar();
+        let a3 = async (x) => await baz(x);
+        let a4 = async (x, y) => { await far(x, y); }
+        let a5 = async ({x = [1], y: z = 2}) => { await wow(x, z); }
+    }
+}
+
+async_arrow_wait: {
+    input: {
+        var a = async (x, y) => await x(y);
+    }
+    expect_exact: "var a=async(x,y)=>await x(y);"
+}
+
+async_arrow_iife: {
+    input: {
+        (async () => {
+            await fetch({});
+        })();
+    }
+    expect_exact: "(async()=>{await fetch({})})();"
+}
+
+async_arrow_iife_negate_iife: {
+    options = {
+        negate_iife: true,
+    }
+    input: {
+        (async () => {
+            await fetch();
+        })();
+        (() => {
+            plain();
+        })();
+    }
+    expect_exact: "(async()=>{await fetch()})();(()=>{plain()})();"
+}
+
+issue_2344_1: {
+    beautify = {
+        safari10: false,
+    }
+    input: {
+        async () => {
+            +await x;
+            await y;
+            return await z;
+        };
+    }
+    expect_exact: "async()=>{+await x;await y;return await z};"
+}
+
+issue_2344_2: {
+    beautify = {
+        safari10: true,
+    }
+    input: {
+        async () => {
+            +await x;
+            await y;
+            return await z;
+        };
+    }
+    expect_exact: "async()=>{+(await x);await y;return await z};"
+}

test/compress/block-scope.js

@@ -0,0 +1,191 @@
+
+let_statement: {
+    input: {
+        let x = 6;
+    }
+    expect_exact: "let x=6;"
+}
+
+do_not_hoist_let: {
+    options = {
+        hoist_vars: true,
+    };
+    input: {
+        function x() {
+            if (FOO) {
+                let let1;
+                let let2;
+                var var1;
+                var var2;
+            }
+        }
+    }
+    expect: {
+        function x() {
+            var var1, var2;
+            if (FOO) {
+                let let1;
+                let let2;
+            }
+        }
+    }
+}
+
+do_not_remove_anon_blocks_if_they_have_decls: {
+    input: {
+        function x() {
+            {
+                let x;
+            }
+            {
+                var x;
+            }
+            {
+                const y;
+                class Zee {};
+            }
+        }
+        {
+            let y;
+        }
+        {
+            var y;
+        }
+    }
+    expect: {
+        function x(){
+            {
+                let x
+            }
+            var x;
+            {
+                const y;
+                class Zee {}
+            }
+        }
+        {
+            let y
+        }
+        var y;
+    }
+}
+
+remove_unused_in_global_block: {
+    options = {
+        unused: true,
+    }
+    input: {
+        {
+            let x;
+            const y;
+            class Zee {};
+            var w;
+        }
+        let ex;
+        const why;
+        class Zed {};
+        var wut;
+        console.log(x, y, Zee);
+    }
+    expect: {
+        var w;
+        let ex;
+        const why;
+        class Zed {};
+        var wut;
+        console.log(x, y, Zee);
+    }
+}
+
+regression_block_scope_resolves: {
+    mangle = { };
+    options = {
+        dead_code: false
+    };
+    input: {
+        (function () {
+            if (1) {
+                let x;
+                const y = 1;
+                class Zee {};
+            }
+            if (1) {
+                let ex;
+                const why = 2;
+                class Zi {};
+            }
+            console.log(typeof x, typeof y, typeof Zee, typeof ex, typeof why, typeof Zi);
+        }());
+    }
+    expect: {
+        (function () {
+            if (1) {
+                let e;
+                const o = 1;
+                class t {};
+            }
+            if (1) {
+                let e;
+                const o = 2;
+                class t {};
+            }
+            console.log(typeof x, typeof y, typeof Zee, typeof ex, typeof why, typeof Zi);
+        }());
+    }
+    expect_stdout: "undefined undefined undefined undefined undefined undefined"
+    node_version: ">=6"
+}
+
+switch_block_scope_mangler: {
+    mangle = {}
+    input: {
+        var fn = function(code) {
+            switch (code) {
+                case 1:
+                    let apple = code + 1;
+                    let dog = code + 4;
+                    console.log(apple, dog);
+                    break;
+                case 2:
+                    let banana = code + 2;
+                    console.log(banana);
+                    break;
+                default:
+                    let cat = code + 3;
+                    console.log(cat);
+            }
+        };
+        fn(1);
+        fn(2);
+        fn(3);
+    }
+    expect: {
+        var fn = function(e) {
+            switch (e) {
+              case 1:
+                let l = e + 1
+                let o = e + 4;
+                console.log(l, o);
+                break;
+
+              case 2:
+                let n = e + 2;
+                console.log(n);
+                break;
+
+              default:
+                let c = e + 3;
+                console.log(c);
+            }
+        };
+        fn(1);
+        fn(2);
+        fn(3);
+    }
+    expect_stdout: [
+        "2 5",
+        "4",
+        "6",
+    ]
+    node_version: ">=6"
+}

test/compress/blocks.js

@@ -47,3 +47,142 @@ keep_some_blocks: {
         } else stuff();
     }
 }
+
+issue_1664: {
+    input: {
+        var a = 1;
+        function f() {
+            if (undefined) a = 2;
+            {
+                function undefined() {}
+                undefined();
+            }
+        }
+        f();
+        console.log(a);
+    }
+    expect: {
+        var a = 1;
+        function f() {
+            if (undefined) a = 2;
+            {
+                function undefined() {}
+                undefined();
+            }
+        }
+        f();
+        console.log(a);
+    }
+    expect_stdout: "1"
+    node_version: ">=6"
+}
+
+issue_1672_for: {
+    input: {
+        switch (function() {
+            return xxx;
+        }) {
+          case xxx:
+            for (; console.log("FAIL");) {
+                function xxx() {}
+            }
+            break;
+        }
+    }
+    expect: {
+        switch (function() {
+            return xxx;
+        }) {
+          case xxx:
+            for (; console.log("FAIL");) {
+                function xxx() {}
+            }
+            break;
+        }
+    }
+    expect_stdout: true
+    node_version: ">=6"
+}
+
+issue_1672_for_strict: {
+    input: {
+        "use strict";
+        switch (function() {
+            return xxx;
+        }) {
+          case xxx:
+            for (; console.log("FAIL");) {
+                function xxx() {}
+            }
+            break;
+        }
+    }
+    expect: {
+        "use strict";
+        switch (function() {
+            return xxx;
+        }) {
+          case xxx:
+            for (; console.log("FAIL");) {
+                function xxx() {}
+            }
+            break;
+        }
+    }
+    expect_stdout: true
+    node_version: ">=6"
+}
+
+issue_1672_if: {
+    input: {
+        switch (function() {
+            return xxx;
+        }) {
+          case xxx:
+            if (console.log("FAIL")) {
+                function xxx() {}
+            }
+            break;
+        }
+    }
+    expect: {
+        switch (function() {
+            return xxx;
+        }) {
+          case xxx:
+            if (console.log("FAIL")) function xxx() {}
+            break;
+        }
+    }
+    expect_stdout: true
+    node_version: ">=6"
+}
+
+issue_1672_if_strict: {
+    input: {
+        "use strict";
+        switch (function() {
+            return xxx;
+        }) {
+          case xxx:
+            if (console.log("FAIL")) {
+                function xxx() {}
+            }
+            break;
+        }
+    }
+    expect: {
+        "use strict";
+        switch (function() {
+            return xxx;
+        }) {
+          case xxx:
+            if (console.log("FAIL")) {
+                function xxx() {}
+            }
+            break;
+        }
+    }
+    expect_stdout: true
+    node_version: ">=6"
+}

test/compress/booleans.js

@@ -1,155 +0,0 @@
-iife_boolean_context: {
-    options = {
-        booleans: true,
-        evaluate: true,
-    }
-    input: {
-        console.log(function() {
-            return Object(1) || false;
-        }() ? "PASS" : "FAIL");
-        console.log(function() {
-            return [].length || true;
-        }() ? "PASS" : "FAIL");
-    }
-    expect: {
-        console.log(function() {
-            return Object(1);
-        }() ? "PASS" : "FAIL");
-        console.log(function() {
-            return [].length, 1;
-        }() ? "PASS" : "FAIL");
-    }
-    expect_stdout: [
-        "PASS",
-        "PASS",
-    ]
-    expect_warnings: [
-        "WARN: Dropping side-effect-free || [test/compress/booleans.js:2,19]",
-        "WARN: Boolean || always true [test/compress/booleans.js:5,19]",
-    ]
-}
-
-issue_3465_1: {
-    options = {
-        booleans: true,
-    }
-    input: {
-        console.log(function(a) {
-            return typeof a;
-        }() ? "PASS" : "FAIL");
-    }
-    expect: {
-        console.log(function(a) {
-            return 1;
-        }() ? "PASS" : "FAIL");
-    }
-    expect_stdout: "PASS"
-}
-
-issue_3465_2: {
-    options = {
-        booleans: true,
-    }
-    input: {
-        console.log(function f(a) {
-            if (!a) console.log(f(42));
-            return typeof a;
-        }() ? "PASS" : "FAIL");
-    }
-    expect: {
-        console.log(function f(a) {
-            if (!a) console.log(f(42));
-            return typeof a;
-        }() ? "PASS" : "FAIL");
-    }
-    expect_stdout: [
-        "number",
-        "PASS",
-    ]
-}
-
-issue_3465_3: {
-    options = {
-        booleans: true,
-        passes: 2,
-        unused: true,
-    }
-    input: {
-        console.log(function f(a) {
-            return typeof a;
-        }() ? "PASS" : "FAIL");
-    }
-    expect: {
-        console.log(function(a) {
-            return 1;
-        }() ? "PASS" : "FAIL");
-    }
-    expect_stdout: "PASS"
-}
-
-issue_2737_2: {
-    options = {
-        booleans: true,
-        inline: true,
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        (function(bar) {
-            for (;bar();) break;
-        })(function qux() {
-            return console.log("PASS"), qux;
-        });
-    }
-    expect: {
-        (function(bar) {
-            for (;bar();) break;
-        })(function() {
-            return console.log("PASS"), 1;
-        });
-    }
-    expect_stdout: "PASS"
-}
-
-issue_3658: {
-    options = {
-        booleans: true,
-        evaluate: true,
-        reduce_vars: true,
-    }
-    input: {
-        console.log(function f() {
-            console || f();
-            return "PASS";
-        }());
-    }
-    expect: {
-        console.log(function f() {
-            console || f();
-            return "PASS";
-        }());
-    }
-    expect_stdout: "PASS"
-}
-
-issue_3690: {
-    options = {
-        booleans: true,
-        unused: true,
-    }
-    input: {
-        console.log(function(a) {
-            return function() {
-                return a = [ this ];
-            }() ? "PASS" : "FAIL";
-        }());
-    }
-    expect: {
-        console.log(function(a) {
-            return function() {
-                return 1;
-            }() ? "PASS" : "FAIL";
-        }());
-    }
-    expect_stdout: "PASS"
-}

test/compress/comparing.js

@@ -0,0 +1,114 @@
+keep_comparisons: {
+    options = {
+        comparisons: true,
+        unsafe_comps: false
+    }
+    input: {
+        var obj1 = {
+            valueOf: function() {triggeredFirst();}
+        }
+        var obj2 = {
+            valueOf: function() {triggeredSecond();}
+        }
+        var result1 = obj1 <= obj2;
+        var result2 = obj1 <  obj2;
+        var result3 = obj1 >= obj2;
+        var result4 = obj1 >  obj2;
+    }
+    expect: {
+        var obj1 = {
+            valueOf: function() {triggeredFirst();}
+        }
+        var obj2 = {
+            valueOf: function() {triggeredSecond();}
+        }
+        var result1 = obj1 <= obj2;
+        var result2 = obj1 <  obj2;
+        var result3 = obj1 >= obj2;
+        var result4 = obj1 >  obj2;
+    }
+}
+
+keep_comparisons_with_unsafe_comps: {
+    options = {
+        comparisons: true,
+        unsafe_comps: true
+    }
+    input: {
+        var obj1 = {
+            valueOf: function() {triggeredFirst();}
+        }
+        var obj2 = {
+            valueOf: function() {triggeredSecond();}
+        }
+        var result1 = obj1 <= obj2;
+        var result2 = obj1 <  obj2;
+        var result3 = obj1 >= obj2;
+        var result4 = obj1 >  obj2;
+    }
+    expect: {
+        var obj1 = {
+            valueOf: function() {triggeredFirst();}
+        }
+        var obj2 = {
+            valueOf: function() {triggeredSecond();}
+        }
+        var result1 = obj2 >= obj1;
+        var result2 = obj2 >  obj1;
+        var result3 = obj1 >= obj2;
+        var result4 = obj1 >  obj2;
+    }
+}
+
+dont_change_in_or_instanceof_expressions: {
+    input: {
+        1 in 1;
+        null in null;
+        1 instanceof 1;
+        null instanceof null;
+    }
+    expect: {
+        1 in 1;
+        null in null;
+        1 instanceof 1;
+        null instanceof null;
+    }
+}
+
+self_comparison_1: {
+    options = {
+        comparisons: true,
+    }
+    input: {
+        a === a;
+        a !== b;
+        b.c === a.c;
+        b.c !== b.c;
+    }
+    expect: {
+        a == a;
+        a !== b;
+        b.c === a.c;
+        b.c != b.c;
+    }
+}
+
+self_comparison_2: {
+    options = {
+        comparisons: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+    }
+    input: {
+        function f() {}
+        var o = {};
+        console.log(f != f, o === o);
+    }
+    expect: {
+        function f() {}
+        var o = {};
+        console.log(false, true);
+    }
+    expect_stdout: "false true"
+}

test/compress/comparisons.js

@@ -1,495 +0,0 @@
-comparisons: {
-    options = {
-        comparisons: true,
-    }
-    input: {
-        var obj1, obj2;
-        var result1 = obj1 <= obj2;
-        var result2 = obj1 <  obj2;
-        var result3 = obj1 >= obj2;
-        var result4 = obj1 >  obj2;
-    }
-    expect: {
-        var obj1, obj2;
-        var result1 = obj1 <= obj2;
-        var result2 = obj1 <  obj2;
-        var result3 = obj2 <= obj1;
-        var result4 = obj2 <  obj1;
-    }
-}
-
-unsafe_comps: {
-    options = {
-        comparisons: true,
-        conditionals: true,
-        unsafe_comps: true,
-    }
-    input: {
-        var obj1, obj2;
-        obj1 <= obj2 ? f1() : g1();
-        obj1 <  obj2 ? f2() : g2();
-        obj1 >= obj2 ? f3() : g3();
-        obj1 >  obj2 ? f4() : g4();
-    }
-    expect: {
-        var obj1, obj2;
-        (obj2 <  obj1 ? g1 : f1)();
-        (obj1 <  obj2 ? f2 : g2)();
-        (obj1 <  obj2 ? g3 : f3)();
-        (obj2 <  obj1 ? f4 : g4)();
-    }
-}
-
-dont_change_in_or_instanceof_expressions: {
-    input: {
-        1 in 1;
-        null in null;
-        1 instanceof 1;
-        null instanceof null;
-    }
-    expect: {
-        1 in 1;
-        null in null;
-        1 instanceof 1;
-        null instanceof null;
-    }
-}
-
-self_comparison_1: {
-    options = {
-        comparisons: true,
-    }
-    input: {
-        a === a;
-        a !== b;
-        b.c === a.c;
-        b.c !== b.c;
-    }
-    expect: {
-        a == a;
-        a !== b;
-        b.c === a.c;
-        b.c != b.c;
-    }
-}
-
-self_comparison_2: {
-    options = {
-        comparisons: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-    }
-    input: {
-        function f() {}
-        var o = {};
-        console.log(f != f, o === o);
-    }
-    expect: {
-        function f() {}
-        var o = {};
-        console.log(false, true);
-    }
-    expect_stdout: "false true"
-}
-
-self_comparison_3: {
-    options = {
-        comparisons: true,
-    }
-    input: {
-        var a;
-        function f() {
-            var b = a;
-            a = null;
-            return b;
-        }
-        for (var i = 0; i < 2; i++)
-            console.log(f() === f());
-    }
-    expect: {
-        var a;
-        function f() {
-            var b = a;
-            a = null;
-            return b;
-        }
-        for (var i = 0; i < 2; i++)
-            console.log(f() === f());
-    }
-    expect_stdout: [
-        "false",
-        "true",
-    ]
-}
-
-self_comparison_4: {
-    options = {
-        booleans: true,
-        comparisons: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var o = {};
-        console.log(o == o, o != o);
-        console.log(o === o, o !== o);
-    }
-    expect: {
-        console.log(!0, !1);
-        console.log(!0, !1);
-    }
-    expect_stdout: [
-        "true false",
-        "true false",
-    ]
-}
-
-issue_2857_1: {
-    options = {
-        comparisons: true,
-    }
-    input: {
-        function f1(a) {
-            a === undefined || a === null;
-            a === undefined || a !== null;
-            a !== undefined || a === null;
-            a !== undefined || a !== null;
-            a === undefined && a === null;
-            a === undefined && a !== null;
-            a !== undefined && a === null;
-            a !== undefined && a !== null;
-        }
-        function f2(a) {
-            a === null || a === undefined;
-            a === null || a !== undefined;
-            a !== null || a === undefined;
-            a !== null || a !== undefined;
-            a === null && a === undefined;
-            a === null && a !== undefined;
-            a !== null && a === undefined;
-            a !== null && a !== undefined;
-        }
-    }
-    expect: {
-        function f1(a) {
-            null == a;
-            void 0 === a || null !== a;
-            void 0 !== a || null === a;
-            void 0 !== a || null !== a;
-            void 0 === a && null === a;
-            void 0 === a && null !== a;
-            void 0 !== a && null === a;
-            null != a;
-        }
-        function f2(a) {
-            null == a;
-            null === a || void 0 !== a;
-            null !== a || void 0 === a;
-            null !== a || void 0 !== a;
-            null === a && void 0 === a;
-            null === a && void 0 !== a;
-            null !== a && void 0 === a;
-            null != a;
-        }
-    }
-}
-
-issue_2857_2: {
-    options = {
-        comparisons: true,
-    }
-    input: {
-        function f(a, p) {
-            a === undefined || a === null || p;
-            a === undefined || a !== null || p;
-            a !== undefined || a === null || p;
-            a !== undefined || a !== null || p;
-            a === undefined && a === null || p;
-            a === undefined && a !== null || p;
-            a !== undefined && a === null || p;
-            a !== undefined && a !== null || p;
-        }
-    }
-    expect: {
-        function f(a, p) {
-            null == a || p;
-            void 0 === a || null !== a || p;
-            void 0 !== a || null === a || p;
-            void 0 !== a || null !== a || p;
-            void 0 === a && null === a || p;
-            void 0 === a && null !== a || p;
-            void 0 !== a && null === a || p;
-            null != a || p;
-        }
-    }
-}
-
-issue_2857_3: {
-    options = {
-        comparisons: true,
-    }
-    input: {
-        function f(a, p) {
-            a === undefined || a === null && p;
-            a === undefined || a !== null && p;
-            a !== undefined || a === null && p;
-            a !== undefined || a !== null && p;
-            a === undefined && a === null && p;
-            a === undefined && a !== null && p;
-            a !== undefined && a === null && p;
-            a !== undefined && a !== null && p;
-        }
-    }
-    expect: {
-        function f(a, p) {
-            void 0 === a || null === a && p;
-            void 0 === a || null !== a && p;
-            void 0 !== a || null === a && p;
-            void 0 !== a || null !== a && p;
-            void 0 === a && null === a && p;
-            void 0 === a && null !== a && p;
-            void 0 !== a && null === a && p;
-            null != a && p;
-        }
-    }
-}
-
-issue_2857_4: {
-    options = {
-        comparisons: true,
-    }
-    input: {
-        function f(a, p) {
-            p || a === undefined || a === null;
-            p || a === undefined || a !== null;
-            p || a !== undefined || a === null;
-            p || a !== undefined || a !== null;
-            p || a === undefined && a === null;
-            p || a === undefined && a !== null;
-            p || a !== undefined && a === null;
-            p || a !== undefined && a !== null;
-        }
-    }
-    expect: {
-        function f(a, p) {
-            p || null == a;
-            p || void 0 === a || null !== a;
-            p || void 0 !== a || null === a;
-            p || void 0 !== a || null !== a;
-            p || void 0 === a && null === a;
-            p || void 0 === a && null !== a;
-            p || void 0 !== a && null === a;
-            p || null != a;
-        }
-    }
-}
-
-issue_2857_5: {
-    options = {
-        comparisons: true,
-    }
-    input: {
-        function f(a, p) {
-            p && a === undefined || a === null;
-            p && a === undefined || a !== null;
-            p && a !== undefined || a === null;
-            p && a !== undefined || a !== null;
-            p && a === undefined && a === null;
-            p && a === undefined && a !== null;
-            p && a !== undefined && a === null;
-            p && a !== undefined && a !== null;
-        }
-    }
-    expect: {
-        function f(a, p) {
-            p && void 0 === a || null === a;
-            p && void 0 === a || null !== a;
-            p && void 0 !== a || null === a;
-            p && void 0 !== a || null !== a;
-            p && void 0 === a && null === a;
-            p && void 0 === a && null !== a;
-            p && void 0 !== a && null === a;
-            p && null != a;
-        }
-    }
-}
-
-issue_2857_6: {
-    options = {
-        comparisons: true,
-        pure_getters: "strict",
-        reduce_vars: true,
-    }
-    input: {
-        function f(a) {
-            if (({}).b === undefined || {}.b === null)
-                return a.b !== undefined && a.b !== null;
-        }
-        console.log(f({
-            a: [ null ],
-            get b() {
-                return this.a.shift();
-            }
-        }));
-    }
-    expect: {
-        function f(a) {
-            if (null == {}.b)
-                return void 0 !== a.b && null !== a.b;
-        }
-        console.log(f({
-            a: [ null ],
-            get b() {
-                return this.a.shift();
-            }
-        }));
-    }
-    expect_stdout: "true"
-}
-
-is_boolean_unsafe: {
-    options = {
-        comparisons: true,
-        unsafe: true,
-    }
-    input: {
-        console.log(/foo/.test("bar") === [].isPrototypeOf({}));
-    }
-    expect: {
-        console.log(/foo/.test("bar") == [].isPrototypeOf({}));
-    }
-    expect_stdout: "true"
-}
-
-is_number_unsafe: {
-    options = {
-        comparisons: true,
-        unsafe: true,
-    }
-    input: {
-        console.log(Math.acos(42) !== "foo".charCodeAt(4));
-    }
-    expect: {
-        console.log(Math.acos(42) != "foo".charCodeAt(4));
-    }
-    expect_stdout: "true"
-}
-
-is_boolean_var: {
-    options = {
-        comparisons: true,
-        reduce_vars: true,
-    }
-    input: {
-        console.log(function(a, b) {
-            for (var i = 0, c = !b; i < a.length; i++)
-                if (!a[i] === c)
-                    return i;
-        }([ false, true ], 42));
-    }
-    expect: {
-        console.log(function(a, b) {
-            for (var i = 0, c = !b; i < a.length; i++)
-                if (!a[i] == c)
-                    return i;
-        }([ false, true ], 42));
-    }
-    expect_stdout: "1"
-}
-
-is_defined: {
-    options = {
-        comparisons: true,
-    }
-    input: {
-        console.log(function a() {
-            return void 0 === a;
-        }());
-    }
-    expect: {
-        console.log(function a() {
-            return a, false;
-        }());
-    }
-    expect_stdout: "false"
-    expect_warnings: [
-        "WARN: Expression always defined [test/compress/comparisons.js:2,19]",
-    ]
-}
-
-unsafe_indexOf: {
-    options = {
-        booleans: true,
-        comparisons: true,
-        unsafe: true,
-    }
-    input: {
-        var a = Object.keys({ foo: 42 });
-        if (a.indexOf("bar") < 0) console.log("PASS");
-        if (0 > a.indexOf("bar")) console.log("PASS");
-        if (a.indexOf("foo") >= 0) console.log("PASS");
-        if (0 <= a.indexOf("foo")) console.log("PASS");
-        if (a.indexOf("foo") > -1) console.log("PASS");
-        if (-1 < a.indexOf("foo")) console.log("PASS");
-        if (a.indexOf("bar") == -1) console.log("PASS");
-        if (-1 == a.indexOf("bar")) console.log("PASS");
-        if (a.indexOf("bar") === -1) console.log("PASS");
-        if (-1 === a.indexOf("bar")) console.log("PASS");
-        if (a.indexOf("foo") != -1) console.log("PASS");
-        if (-1 != a.indexOf("foo")) console.log("PASS");
-        if (a.indexOf("foo") !== -1) console.log("PASS");
-        if (-1 !== a.indexOf("foo")) console.log("PASS");
-    }
-    expect: {
-        var a = Object.keys({ foo: 42 });
-        if (!~a.indexOf("bar")) console.log("PASS");
-        if (!~a.indexOf("bar")) console.log("PASS");
-        if (~a.indexOf("foo")) console.log("PASS");
-        if (~a.indexOf("foo")) console.log("PASS");
-        if (~a.indexOf("foo")) console.log("PASS");
-        if (~a.indexOf("foo")) console.log("PASS");
-        if (!~a.indexOf("bar")) console.log("PASS");
-        if (!~a.indexOf("bar")) console.log("PASS");
-        if (!~a.indexOf("bar")) console.log("PASS");
-        if (!~a.indexOf("bar")) console.log("PASS");
-        if (~a.indexOf("foo")) console.log("PASS");
-        if (~a.indexOf("foo")) console.log("PASS");
-        if (~a.indexOf("foo")) console.log("PASS");
-        if (~a.indexOf("foo")) console.log("PASS");
-    }
-    expect_stdout: [
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-        "PASS",
-    ]
-}
-
-issue_3413: {
-    options = {
-        comparisons: true,
-        evaluate: true,
-        side_effects: true,
-    }
-    input: {
-        var b;
-        void 0 !== ("" < b || void 0) || console.log("PASS");
-    }
-    expect: {
-        var b;
-        void 0 !== ("" < b || void 0) || console.log("PASS");
-    }
-    expect_stdout: "PASS"
-}

test/compress/concat-strings.js

@@ -1,7 +1,7 @@
 concat_1: {
     options = {
-        evaluate: true,
-    }
+        evaluate: true
+    };
     input: {
         var a = "foo" + "bar" + x() + "moo" + "foo" + y() + "x" + "y" + "z" + q();
         var b = "foo" + 1 + x() + 2 + "boo";
@@ -26,9 +26,7 @@ concat_1: {
 }
 
 concat_2: {
-    options = {
-        strings: true,
-    }
+    options = {};
     input: {
         console.log(
             1 + (2 + 3),
@@ -57,9 +55,7 @@ concat_2: {
 }
 
 concat_3: {
-    options = {
-        strings: true,
-    }
+    options = {};
     input: {
         console.log(
             1 + 2 + (3 + 4 + 5),
@@ -88,9 +84,7 @@ concat_3: {
 }
 
 concat_4: {
-    options = {
-        strings: true,
-    }
+    options = {};
     input: {
         console.log(
             1 + "2" + (3 + 4 + 5),
@@ -119,9 +113,7 @@ concat_4: {
 }
 
 concat_5: {
-    options = {
-        strings: true,
-    }
+    options = {};
     input: {
         console.log(
             "1" + 2 + (3 + 4 + 5),
@@ -150,9 +142,7 @@ concat_5: {
 }
 
 concat_6: {
-    options = {
-        strings: true,
-    }
+    options = {};
     input: {
         console.log(
             "1" + "2" + (3 + 4 + 5),
@@ -181,9 +171,6 @@ concat_6: {
 }
 
 concat_7: {
-    options = {
-        strings: true,
-    }
     input: {
         console.log(
             "" + 1,
@@ -210,9 +197,6 @@ concat_7: {
 }
 
 concat_8: {
-    options = {
-        strings: true,
-    }
     input: {
         console.log(
             1 + "",
@@ -237,20 +221,3 @@ concat_8: {
     }
     expect_stdout: true
 }
-
-issue_3689: {
-    options = {
-        strings: true,
-    }
-    input: {
-        console.log(function(a) {
-            return a + ("" + (a[0] = 0));
-        }([]));
-    }
-    expect: {
-        console.log(function(a) {
-            return a + ("" + (a[0] = 0));
-        }([]));
-    }
-    expect_stdout: "00"
-}

test/compress/conditionals.js

@@ -1,7 +1,7 @@
 ifs_1: {
     options = {
-        conditionals: true,
-    }
+        conditionals: true
+    };
     input: {
         if (foo) bar();
         if (!foo); else bar();
@@ -18,8 +18,8 @@ ifs_1: {
 
 ifs_2: {
     options = {
-        conditionals: true,
-    }
+        conditionals: true
+    };
     input: {
         if (foo) {
             x();
@@ -41,18 +41,18 @@ ifs_2: {
     }
     expect: {
         foo ? x() : bar ? y() : baz && z();
-        (foo ? x : bar ? y : baz ? z : t)();
+        foo ? x() : bar ? y() : baz ? z() : t();
     }
 }
 
 ifs_3_should_warn: {
     options = {
-        booleans: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        side_effects: true,
-    }
+        conditionals : true,
+        dead_code    : true,
+        evaluate     : true,
+        booleans     : true,
+        side_effects : true,
+    };
     input: {
         var x, y;
         if (x && !(x + "1") && y) { // 1
@@ -78,8 +78,8 @@ ifs_3_should_warn: {
 
 ifs_4: {
     options = {
-        conditionals: true,
-    }
+        conditionals: true
+    };
     input: {
         if (foo && bar) {
             x(foo)[10].bar.baz = something();
@@ -95,10 +95,10 @@ ifs_4: {
 
 ifs_5: {
     options = {
-        comparisons: true,
-        conditionals: true,
         if_return: true,
-    }
+        conditionals: true,
+        comparisons: true,
+    };
     input: {
         function f() {
             if (foo) return;
@@ -132,9 +132,9 @@ ifs_5: {
 
 ifs_6: {
     options = {
-        comparisons: true,
         conditionals: true,
-    }
+        comparisons: true
+    };
     input: {
         var x, y;
         if (!foo && !bar && !baz && !boo) {
@@ -161,28 +161,10 @@ ifs_6: {
     }
 }
 
-ifs_7: {
-    options = {
-        conditionals: true,
-    }
-    input: {
-        if (A); else;
-        if (A) while (B); else;
-        if (A); else while (C);
-        if (A) while (B); else while (C);
-    }
-    expect: {
-        A;
-        if (A) while (B);
-        if (!A) while (C);
-        if (A) while (B); else while (C);
-    }
-}
-
 cond_1: {
     options = {
-        conditionals: true,
-    }
+        conditionals: true
+    };
     input: {
         function foo(do_something, some_condition) {
             if (some_condition) {
@@ -207,8 +189,8 @@ cond_1: {
 
 cond_2: {
     options = {
-        conditionals: true,
-    }
+        conditionals: true
+    };
     input: {
         function foo(x, FooBar, some_condition) {
             if (some_condition) {
@@ -227,8 +209,8 @@ cond_2: {
 
 cond_3: {
     options = {
-        conditionals: true,
-    }
+        conditionals: true
+    };
     input: {
         var FooBar;
         if (some_condition()) {
@@ -245,8 +227,8 @@ cond_3: {
 
 cond_4: {
     options = {
-        conditionals: true,
-    }
+        conditionals: true
+    };
     input: {
         var do_something;
         if (some_condition()) {
@@ -269,8 +251,8 @@ cond_4: {
 
 cond_5: {
     options = {
-        conditionals: true,
-    }
+        conditionals: true
+    };
     input: {
         if (some_condition()) {
             if (some_other_condition()) {
@@ -289,56 +271,17 @@ cond_5: {
         }
     }
     expect: {
-        (some_condition() && some_other_condition() ? do_something : alternate)();
+        some_condition() && some_other_condition() ? do_something() : alternate();
         some_condition() && some_other_condition() && do_something();
     }
 }
 
-cond_6: {
-    options = {
-        booleans: true,
-        conditionals: true,
-    }
-    input: {
-        x ? a : b;
-        x ? a : a;
-
-        x ? y ? a : b : c;
-        x ? y ? a : a : b;
-        x ? y ? a : b : b;
-        x ? y ? a : b : a;
-        x ? y ? a : a : a;
-
-        x ? a : y ? b : c;
-        x ? a : y ? a : b;
-        x ? a : y ? b : b;
-        x ? a : y ? b : a;
-        x ? a : y ? a : a;
-    }
-    expect: {
-        x ? a : b;
-        x, a;
-
-        x ? y ? a : b : c;
-        x ? (y, a) : b;
-        x && y ? a : b;
-        !x || y ? a : b;
-        x && y, a;
-
-        x ? a : y ? b : c;
-        x || y ? a : b;
-        x ? a : (y, b);
-        !x && y ? b : a;
-        !x && y, a;
-    }
-}
-
 cond_7: {
     options = {
         conditionals: true,
-        evaluate: true,
+        evaluate    : true,
         side_effects: true,
-    }
+    };
     input: {
         var x, y, z, a, b;
         // compress these
@@ -389,7 +332,7 @@ cond_7: {
         x = 'foo';
         x = 'foo';
         x = (condition(), 20);
-        x = (z || condition(), 'fuji');
+        x = z ? 'fuji' : (condition(), 'fuji');
         x = (condition(), 'foobar');
         x = y ? a : b;
         x = y ? 'foo' : 'fo';
@@ -399,8 +342,8 @@ cond_7: {
 cond_7_1: {
     options = {
         conditionals: true,
-        evaluate: true,
-    }
+        evaluate    : true
+    };
     input: {
         var x;
         // access to global should be assumed to have side effects
@@ -418,10 +361,10 @@ cond_7_1: {
 
 cond_8: {
     options = {
-        booleans: false,
         conditionals: true,
-        evaluate: true,
-    }
+        evaluate    : true,
+        booleans    : false
+    };
     input: {
         var a;
         // compress these
@@ -502,10 +445,10 @@ cond_8: {
 
 cond_8b: {
     options = {
-        booleans: true,
         conditionals: true,
-        evaluate: true,
-    }
+        evaluate    : true,
+        booleans    : true
+    };
     input: {
         var a;
         // compress these
@@ -585,10 +528,10 @@ cond_8b: {
 
 cond_8c: {
     options = {
-        booleans: false,
         conditionals: true,
-        evaluate: false,
-    }
+        evaluate    : false,
+        booleans    : false
+    };
     input: {
         var a;
         // compress these
@@ -702,104 +645,11 @@ cond_9: {
     }
 }
 
-cond_10: {
-    options = {
-        conditionals: true,
-        if_return: true,
-    }
-    input: {
-        function f(a) {
-            if (1 == a) return "foo";
-            if (2 == a) return "foo";
-            if (3 == a) return "foo";
-            if (4 == a) return 42;
-            if (5 == a) return "foo";
-            if (6 == a) return "foo";
-            return "bar";
-        }
-        console.log(f(1), f(2), f(3), f(4), f(5), f(6), f(7));
-    }
-    expect: {
-        function f(a) {
-            return 1 == a || 2 == a || 3 == a ? "foo" : 4 == a ? 42 : 5 == a || 6 == a ? "foo" : "bar";
-        }
-        console.log(f(1), f(2), f(3), f(4), f(5), f(6), f(7));
-    }
-    expect_stdout: "foo foo foo 42 foo foo bar"
-}
-
-cond_11: {
-    options = {
-        conditionals: true,
-    }
-    input: {
-        var o = {
-            p: "foo",
-            q: function() {
-                return this.p;
-            }
-        };
-        function f() {
-            return "bar";
-        }
-        function g(a) {
-            return a ? f() : o.q();
-        }
-        console.log(g(0), g(1));
-    }
-    expect: {
-        var o = {
-            p: "foo",
-            q: function() {
-                return this.p;
-            }
-        };
-        function f() {
-            return "bar";
-        }
-        function g(a) {
-            return a ? f() : o.q();
-        }
-        console.log(g(0), g(1));
-    }
-    expect_stdout: "foo bar"
-}
-
-cond_12: {
-    options = {
-        conditionals: true,
-    }
-    input: {
-        x ? y && a : a;
-        x ? y || a : a;
-        x ? a : y && a;
-        x ? a : y || a;
-    }
-    expect: {
-        (!x || y) && a;
-        x && y || a;
-        (x || y) && a;
-        !x && y || a;
-    }
-}
-
 ternary_boolean_consequent: {
     options = {
-        booleans: true,
-        collapse_vars: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: true,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
-        loops: true,
-        properties: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        collapse_vars:true, sequences:true, properties:true, dead_code:true, conditionals:true,
+        comparisons:true, evaluate:true, booleans:true, loops:true, unused:true, hoist_funs:true,
+        keep_fargs:true, if_return:true, join_vars:true, side_effects:true
     }
     input: {
         function f1() { return a == b ? true : x; }
@@ -825,21 +675,9 @@ ternary_boolean_consequent: {
 
 ternary_boolean_alternative: {
     options = {
-        booleans: true,
-        collapse_vars: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: true,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
-        loops: true,
-        properties: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        collapse_vars:true, sequences:true, properties:true, dead_code:true, conditionals:true,
+        comparisons:true, evaluate:true, booleans:true, loops:true, unused:true, hoist_funs:true,
+        keep_fargs:true, if_return:true, join_vars:true, side_effects:true
     }
     input: {
         function f1() { return a == b ? x : true; }
@@ -865,11 +703,10 @@ ternary_boolean_alternative: {
 
 trivial_boolean_ternary_expressions : {
     options = {
-        booleans: true,
         conditionals: true,
-        evaluate: true,
-        side_effects: true,
-    }
+        evaluate    : true,
+        booleans    : true
+    };
     input: {
         f('foo' in m ? true  : false);
         f('foo' in m ? false : true);
@@ -940,11 +777,11 @@ trivial_boolean_ternary_expressions : {
 
 issue_1154: {
     options = {
-        booleans: true,
         conditionals: true,
-        evaluate: true,
+        evaluate    : true,
+        booleans    : true,
         side_effects: true,
-    }
+    };
     input: {
         function f1(x) { return x ? -1 : -1; }
         function f2(x) { return x ? +2 : +2; }
@@ -980,7 +817,7 @@ issue_1154: {
 no_evaluate: {
     options = {
         conditionals: true,
-        evaluate: false,
+        evaluate    : false,
         side_effects: true,
     }
     input: {
@@ -1240,11 +1077,11 @@ issue_2535_1: {
     expect: {
         y();
         x() && y();
-        x(), y();
+        (x(), 1) && y();
         x() && y();
         x() && y();
         x() && y();
-        x();
+        (x(), 0) && y();
     }
 }
 
@@ -1366,430 +1203,3 @@ issue_2560: {
         "2",
     ]
 }
-
-hoist_decl: {
-    options = {
-        conditionals: true,
-        join_vars: true,
-        sequences: true,
-    }
-    input: {
-        if (x()) {
-            var a;
-            y();
-        } else {
-            z();
-            var b;
-        }
-    }
-    expect: {
-        var a, b;
-        (x() ? y : z)();
-    }
-}
-
-to_and_or: {
-    options = {
-        conditionals: true,
-    }
-    input: {
-        var values = [
-            0,
-            null,
-            true,
-            "foo",
-            false,
-            -1 / 0,
-            void 0,
-        ];
-        values.forEach(function(x) {
-            values.forEach(function(y) {
-                values.forEach(function(z) {
-                    console.log(x ? y || z : z);
-                });
-            });
-        });
-    }
-    expect: {
-        var values = [
-            0,
-            null,
-            true,
-            "foo",
-            false,
-            -1 / 0,
-            void 0,
-        ];
-        values.forEach(function(x) {
-            values.forEach(function(y) {
-                values.forEach(function(z) {
-                    console.log(x && y || z);
-                });
-            });
-        });
-    }
-    expect_stdout: true
-}
-
-cond_seq_assign_1: {
-    options = {
-        conditionals: true,
-        sequences: true,
-    }
-    input: {
-        function f(a) {
-            var t;
-            if (a) {
-                t = "foo";
-                t = "bar";
-            } else {
-                console.log(t);
-                t = 42;
-            }
-            console.log(t);
-        }
-        f(f);
-        f();
-    }
-    expect: {
-        function f(a) {
-            var t;
-            t = a ? (t = "foo", "bar") : (console.log(t), 42),
-            console.log(t);
-        }
-        f(f),
-        f();
-    }
-    expect_stdout: [
-        "bar",
-        "undefined",
-        "42",
-    ]
-}
-
-cond_seq_assign_2: {
-    options = {
-        conditionals: true,
-        sequences: true,
-    }
-    input: {
-        function f(a) {
-            var t;
-            if (a) {
-                t = "foo";
-                a = "bar";
-            } else {
-                console.log(t);
-                t = 42;
-            }
-            console.log(t);
-        }
-        f(f);
-        f();
-    }
-    expect: {
-        function f(a) {
-            var t;
-            a ? (t = "foo", a = "bar") : (console.log(t), t = 42),
-            console.log(t);
-        }
-        f(f),
-        f();
-    }
-    expect_stdout: [
-        "foo",
-        "undefined",
-        "42",
-    ]
-}
-
-cond_seq_assign_3: {
-    options = {
-        assignments: true,
-        conditionals: true,
-    }
-    input: {
-        var c = 0;
-        if (this)
-            c = 1 + c, c = c + 1;
-        else
-            c = 1 + c, c = c + 1;
-        console.log(c);
-    }
-    expect: {
-        var c = 0;
-        this, c = 1 + c, c += 1;
-        console.log(c);
-    }
-    expect_stdout: "2"
-}
-
-issue_3271: {
-    options = {
-        conditionals: true,
-    }
-    input: {
-        function f(a) {
-            var i = 0, b = [];
-            if (a) {
-                b[i++] = 4,
-                b[i++] = 1;
-            } else {
-                b[i++] = 3,
-                b[i++] = 2,
-                b[i++] = 1;
-            }
-            return b;
-        }
-        console.log(f(0).pop(), f(1).pop());
-    }
-    expect: {
-        function f(a) {
-            var i = 0, b = [];
-            a ? b[i++] = 4 : (b[i++] = 3, b[i++] = 2),
-            b[i++] = 1;
-            return b;
-        }
-        console.log(f(0).pop(), f(1).pop());
-    }
-    expect_stdout: "1 1"
-}
-
-iife_condition: {
-    options = {
-        conditionals: true,
-        side_effects: true,
-    }
-    input: {
-        if (function() {
-            return console;
-        }())
-            console.log("PASS");
-    }
-    expect: {
-        !function() {
-            return console;
-        }() || console.log("PASS");
-    }
-    expect_stdout: "PASS"
-}
-
-angularjs_chain: {
-    options = {
-        conditionals: true,
-        passes: 2,
-        side_effects: true,
-    }
-    input: {
-        function nonComputedMember(left, right, context, create) {
-            var lhs = left();
-            if (create && create !== 1) {
-                if (lhs && lhs[right] == null) {
-                    lhs[right] = {};
-                }
-            }
-            var value = lhs != null ? lhs[right] : undefined;
-            if (context) {
-                return { context: lhs, name: right, value: value };
-            } else {
-                return value;
-            }
-        }
-    }
-    expect: {
-        function nonComputedMember(left, right, context, create) {
-            var lhs = left();
-            create && 1 !== create && lhs && null == lhs[right] && (lhs[right] = {});
-            var value = null != lhs ? lhs[right] : void 0;
-            return context ? {
-                context: lhs,
-                name: right,
-                value: value
-            } : value;
-        }
-    }
-}
-
-issue_3576: {
-    options = {
-        conditionals: true,
-        evaluate: true,
-        pure_getters: "strict",
-        reduce_vars: true,
-    }
-    input: {
-        var c = "FAIL";
-        (function(a) {
-            (a = -1) ? (a && (a.a = 0)) : (a && (a.a = 0));
-            a && a[c = "PASS"]++;
-        })();
-        console.log(c);
-    }
-    expect: {
-        var c = "FAIL";
-        (function(a) {
-            a = -1, a, a.a = 0;
-            a, a[c = "PASS"]++;
-        })();
-        console.log(c);
-    }
-    expect_stdout: "PASS"
-}
-
-issue_3668: {
-    options = {
-        conditionals: true,
-        if_return: true,
-    }
-    input: {
-        function f() {
-            try {
-                var undefined = typeof f;
-                if (!f) return undefined;
-                return;
-            } catch (e) {
-                return "FAIL";
-            }
-        }
-        console.log(f());
-    }
-    expect: {
-        function f() {
-            try {
-                var undefined = typeof f;
-                return f ? void 0 : undefined;
-            } catch (e) {
-                return "FAIL";
-            }
-        }
-        console.log(f());
-    }
-    expect_stdout: "undefined"
-}
-
-conditional_assignments_1: {
-    options = {
-        conditionals: true,
-        sequences: true,
-    }
-    input: {
-        function f(a, b, c, d) {
-            a = b;
-            if (c) a = d;
-            return a;
-        }
-        function g(a, b, c, d) {
-            a = b;
-            if (c); else a = d;
-            return a;
-        }
-        console.log(f(0, "FAIL", 1, "PASS"), g(0, "PASS", 1, "FAIL"));
-    }
-    expect: {
-        function f(a, b, c, d) {
-            return a = c ? d : b, a;
-        }
-        function g(a, b, c, d) {
-            return a = c ? b : d, a;
-        }
-        console.log(f(0, "FAIL", 1, "PASS"), g(0, "PASS", 1, "FAIL"));
-    }
-    expect_stdout: "PASS PASS"
-}
-
-conditional_assignments_2: {
-    options = {
-        conditionals: true,
-        sequences: true,
-    }
-    input: {
-        function f1(b, c, d) {
-            a = b;
-            if (c) a = d;
-            return a;
-        }
-        function f2(a, c, d) {
-            a = b;
-            if (c) a = d;
-            return a;
-        }
-        function f3(a, b, d) {
-            a = b;
-            if (c) a = d;
-            return a;
-        }
-        function f4(a, b, c) {
-            a = b;
-            if (c) a = d;
-            return a;
-        }
-    }
-    expect: {
-        function f1(b, c, d) {
-            return a = c ? d : b, a;
-        }
-        function f2(a, c, d) {
-            return a = b, c && (a = d), a;
-        }
-        function f3(a, b, d) {
-            return a = b, c && (a = d), a;
-        }
-        function f4(a, b, c) {
-            return a = b, c && (a = d), a;
-        }
-    }
-}
-
-conditional_assignments_3: {
-    options = {
-        conditionals: true,
-        sequences: true,
-    }
-    input: {
-        console.log(function(a, b) {
-            a = "PASS";
-            if (b) a = a;
-            return a;
-        }(0, 1));
-    }
-    expect: {
-        console.log(function(a, b) {
-            return a = "PASS", b && (a = a), a;
-        }(0, 1));
-    }
-    expect_stdout: "PASS"
-}
-
-issue_3808_1: {
-    options = {
-        conditionals: true,
-        side_effects: true,
-    }
-    input: {
-        var a;
-        a = "PASS", [] + "" && (a = "FAIL");
-        console.log(a);
-    }
-    expect: {
-        var a;
-        a = [] + "" ? "FAIL" : "PASS";
-        console.log(a);
-    }
-    expect_stdout: "PASS"
-}
-
-issue_3808_2: {
-    options = {
-        conditionals: true,
-        side_effects: true,
-    }
-    input: {
-        var a;
-        console.log((a = "PASS", [] + "" && (a = "FAIL")), a);
-    }
-    expect: {
-        var a;
-        console.log((a = "PASS", [] + "" && (a = "FAIL")), a);
-    }
-    expect_stdout: " PASS"
-}

test/compress/const.js

@@ -0,0 +1,170 @@
+issue_1191: {
+    options = {
+        evaluate      : true,
+        booleans      : true,
+        comparisons   : true,
+        dead_code     : true,
+        conditionals  : true,
+        side_effects  : true,
+        unused        : true,
+        hoist_funs    : true,
+        if_return     : true,
+        join_vars     : true,
+        sequences     : false,
+        collapse_vars : false,
+        reduce_funcs  : true,
+        reduce_vars   : true,
+    }
+    input: {
+        function foo(rot) {
+            const rotTol = 5;
+            if (rot < -rotTol || rot > rotTol)
+                bar();
+            baz();
+        }
+    }
+    expect: {
+        function foo(rot) {
+            (rot < -5 || rot > 5) && bar();
+            baz();
+        }
+    }
+}
+
+issue_1194: {
+    options = {
+        evaluate      : true,
+        booleans      : true,
+        comparisons   : true,
+        dead_code     : true,
+        conditionals  : true,
+        side_effects  : true,
+        unused        : true,
+        hoist_funs    : true,
+        if_return     : true,
+        join_vars     : true,
+        sequences     : false,
+        collapse_vars : false,
+        reduce_funcs  : true,
+        reduce_vars   : true,
+    }
+    input: {
+        function f1() {const a = "X"; return a + a;}
+        function f2() {const aa = "X"; return aa + aa;}
+        function f3() {const aaa = "X"; return aaa + aaa;}
+    }
+    expect: {
+        function f1(){return"XX"}
+        function f2(){return"XX"}
+        function f3(){return"XX"}
+    }
+}
+
+issue_1396: {
+    options = {
+        evaluate      : true,
+        booleans      : true,
+        comparisons   : true,
+        dead_code     : true,
+        conditionals  : true,
+        side_effects  : true,
+        unused        : true,
+        hoist_funs    : true,
+        if_return     : true,
+        join_vars     : true,
+        sequences     : false,
+        collapse_vars : false,
+        reduce_funcs  : true,
+        reduce_vars   : true,
+    }
+    input: {
+        function foo(a) {
+            const VALUE = 1;
+            console.log(2 | VALUE);
+            console.log(VALUE + 1);
+            console.log(VALUE);
+            console.log(a & VALUE);
+        }
+        function bar() {
+            const s = "01234567890123456789";
+            console.log(s + s + s + s + s);
+
+            const CONSTANT = "abc";
+            console.log(CONSTANT + CONSTANT + CONSTANT + CONSTANT + CONSTANT);
+        }
+    }
+    expect: {
+        function foo(a) {
+            console.log(3);
+            console.log(2);
+            console.log(1);
+            console.log(1 & a);
+        }
+        function bar() {
+            const s = "01234567890123456789";
+            console.log(s + s + s + s + s);
+
+            console.log("abcabcabcabcabc");
+        }
+    }
+}
+
+unused_regexp_literal: {
+    options = {
+        evaluate      : true,
+        booleans      : true,
+        comparisons   : true,
+        dead_code     : true,
+        conditionals  : true,
+        side_effects  : true,
+        unused        : true,
+        hoist_funs    : true,
+        if_return     : true,
+        join_vars     : true,
+        sequences     : false,
+        collapse_vars : false,
+    }
+    input: {
+        function f(){ var a = /b/; }
+    }
+    expect: {
+        function f(){}
+    }
+}
+
+regexp_literal_not_const: {
+    options = {
+        evaluate      : true,
+        booleans      : true,
+        comparisons   : true,
+        dead_code     : true,
+        conditionals  : true,
+        side_effects  : true,
+        unused        : true,
+        hoist_funs    : true,
+        if_return     : true,
+        join_vars     : true,
+        sequences     : false,
+        collapse_vars : false,
+        reduce_funcs  : true,
+        reduce_vars   : true,
+    }
+    input: {
+        (function(){
+            var result;
+            const s = 'acdabcdeabbb';
+            const REGEXP_LITERAL = /ab*/g;
+            while (result = REGEXP_LITERAL.exec(s)) {
+                console.log(result[0]);
+            }
+        })();
+    }
+    expect: {
+        (function() {
+            var result;
+            const REGEXP_LITERAL = /ab*/g;
+            while (result = REGEXP_LITERAL.exec("acdabcdeabbb")) console.log(result[0]);
+        })();
+    }
+    expect_stdout: true
+}

test/compress/debugger.js

@@ -1,7 +1,7 @@
 keep_debugger: {
     options = {
-        drop_debugger: false,
-    }
+        drop_debugger: false
+    };
     input: {
         debugger;
     }
@@ -12,8 +12,8 @@ keep_debugger: {
 
 drop_debugger: {
     options = {
-        drop_debugger: true,
-    }
+        drop_debugger: true
+    };
     input: {
         debugger;
         if (foo) debugger;

test/compress/destructuring.js

@@ -0,0 +1,662 @@
+destructuring_arrays: {
+    input: {
+        {const [aa, bb] = cc;}
+        {const [aa, [bb, cc]] = dd;}
+        {let [aa, bb] = cc;}
+        {let [aa, [bb, cc]] = dd;}
+        var [aa, bb] = cc;
+        var [aa, [bb, cc]] = dd;
+        var [,[,,,,,],,,zz,] = xx; // Trailing comma
+        var [,,zzz,,] = xxx; // Trailing comma after hole
+    }
+    expect: {
+        {const [aa, bb] = cc;}
+        {const [aa, [bb, cc]] = dd;}
+        {let [aa, bb] = cc;}
+        {let [aa, [bb, cc]] = dd;}
+        var [aa, bb] = cc;
+        var [aa, [bb, cc]] = dd;
+        var [,[,,,,,],,,zz] = xx;
+        var [,,zzz,,] = xxx;
+    }
+}
+
+destructuring_arrays_holes: {
+    input: {
+        var [,,,,] = a;
+        var [,,b,] = c;
+        var [d,,]  = e;
+    }
+    expect_exact: "var[,,,,]=a;var[,,b]=c;var[d,,]=e;"
+}
+
+destructuring_objects: {
+    input: {
+        {const {aa, bb} = {aa:1, bb:2};}
+        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        {let {aa, bb} = {aa:1, bb:2};}
+        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        var {aa, bb} = {aa:1, bb:2};
+        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
+    }
+    expect: {
+        {const {aa, bb} = {aa:1, bb:2};}
+        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        {let {aa, bb} = {aa:1, bb:2};}
+        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        var {aa, bb} = {aa:1, bb:2};
+        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
+    }
+}
+
+destructuring_objects_trailing_elision: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        var {cc,} = foo;
+    }
+    expect_exact: "var{cc}=foo;"
+}
+
+nested_destructuring_objects: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        const [{a},b] = c;
+        let [{d},e] = f;
+        var [{g},h] = i;
+    }
+    expect_exact: 'const[{a},b]=c;let[{d},e]=f;var[{g},h]=i;';
+}
+
+destructuring_constdef_in_loops: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        for (const [x,y] in pairs);
+        for (const [a] = 0;;);
+        for (const {c} of cees);
+    }
+    expect_exact: "for(const[x,y]in pairs);for(const[a]=0;;);for(const{c}of cees);"
+}
+
+destructuring_letdef_in_loops: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        for (let [x,y] in pairs);
+        for (let [a] = 0;;);
+        for (let {c} of cees);
+    }
+    expect_exact: "for(let[x,y]in pairs);for(let[a]=0;;);for(let{c}of cees);"
+}
+
+destructuring_vardef_in_loops: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        for (var [x,y] in pairs);
+        for (var [a] = 0;;);
+        for (var {c} of cees);
+    }
+    expect_exact: "for(var[x,y]in pairs);for(var[a]=0;;);for(var{c}of cees);"
+}
+
+destructuring_expressions: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        ({a, b});
+        [{a}];
+        f({x});
+    }
+    expect_exact: "({a,b});[{a}];f({x});"
+}
+
+destructuring_remove_unused_1: {
+    options = {
+        unused: true
+    }
+    input: {
+        function a() {
+            var unused = "foo";
+            var a = [1];
+            var [b] = a;
+            f(b);
+        }
+        function b() {
+            var unused = "foo";
+            var a = {b: 1};
+            var {b} = a;
+            f(b);
+        }
+        function c() {
+            var unused = "foo";
+            var a = [[1]];
+            var [[b]] = a;
+            f(b);
+        }
+        function d() {
+            var unused = "foo";
+            var a = {b: {b:1}};
+            var {b:{b}} = a;
+            f(b);
+        }
+        function e() {
+            var unused = "foo";
+            var a = [1, 2, 3, 4, 5];
+            var x = [[1, 2, 3]];
+            var y = {h: 1};
+            var [b, ...c] = a;
+            var [...[e, f]] = x;
+            var [...{g: h}] = y;
+            f(b, c, e, f, g);
+        }
+    }
+    expect: {
+        function a() {
+            var a = [1];
+            var [b] = a;
+            f(b);
+        }
+        function b() {
+            var a = {b: 1};
+            var {b} = a;
+            f(b);
+        }
+        function c() {
+            var a = [[1]];
+            var [[b]] = a;
+            f(b);
+        }
+        function d() {
+            var a = {b: {b:1}};
+            var {b:{b}} = a;
+            f(b);
+        }
+        function e() {
+            var a = [1, 2, 3, 4, 5];
+            var x = [[1, 2, 3]];
+            var y = {h: 1};
+            var [b, ...c] = a;
+            var [...[e, f]] = x;
+            var [...{g: h}] = y;
+            f(b, c, e, f, g);
+        }
+    }
+}
+
+destructuring_remove_unused_2: {
+    options = {
+        unused: true
+    }
+    input: {
+        function a() {
+            var unused = "foo";
+            var a = [,,1];
+            var [b] = a;
+            f(b);
+        }
+        function b() {
+            var unused = "foo";
+            var a = [{a: [1]}];
+            var [{b: a}] = a;
+            f(b);
+        }
+    }
+    expect: {
+        function a() {
+            var a = [,,1];
+            var [b] = a;
+            f(b);
+        }
+        function b() {
+            var a = [{a: [1]}];
+            var [{b: a}] = a;
+            f(b);
+        }
+    }
+}
+
+object_destructuring_may_need_parentheses: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        ({a, b} = {a: 1, b: 2});
+    }
+    expect_exact: "({a,b}={a:1,b:2});"
+}
+
+destructuring_with_undefined_as_default_assignment: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        [foo = undefined] = bar;
+        [foo = void 0] = bar;
+    }
+    expect: {
+        [foo] = bar;
+        [foo] = bar;
+    }
+}
+
+destructuring_dont_evaluate_with_undefined_as_default_assignment: {
+    options = {
+        evaluate: false
+    }
+    input: {
+        [foo = undefined] = bar;
+    }
+    expect: {
+        [foo = void 0] = bar;
+    }
+}
+
+reduce_vars: {
+    options = {
+        reduce_funcs: true,
+        reduce_vars: true,
+    }
+    input: {
+        {const [aa, [bb, cc]] = dd;}
+        {let [aa, [bb, cc]] = dd;}
+        var [aa, [bb, cc]] = dd;
+        [aa, [bb, cc]] = dd;
+        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
+        ({aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}});
+        const [{a},b] = c;
+        let [{d},e] = f;
+        var [{g},h] = i;
+        [{a},b] = c;
+        for (const [x,y] in pairs);
+        for (let [x,y] in pairs);
+        for (var [x,y] in pairs);
+        for ([x,y] in pairs);
+    }
+    expect: {
+        {const [aa, [bb, cc]] = dd;}
+        {let [aa, [bb, cc]] = dd;}
+        var [aa, [bb, cc]] = dd;
+        [aa, [bb, cc]] = dd;
+        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
+        ({aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}});
+        const [{a},b] = c;
+        let [{d},e] = f;
+        var [{g},h] = i;
+        [{a},b] = c;
+        for (const [x,y] in pairs);
+        for (let [x,y] in pairs);
+        for (var [x,y] in pairs);
+        for ([x,y] in pairs);
+    }
+}
+
+unused: {
+    options = {
+        unused: true,
+    }
+    input: {
+        let { foo: [, , ...a] } = { foo: [1, 2, 3, 4], bar: 5 };
+        console.log(a);
+    }
+    expect: {
+        let { foo: [, , ...a] } = { foo: [1, 2, 3, 4], bar: 5 };
+        console.log(a);
+    }
+}
+
+issue_1886: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        let [a] = [1];
+        console.log(a);
+    }
+    expect: {
+        let [a] = [1];
+        console.log(a);
+    }
+}
+
+destructuring_decl_of_numeric_key: {
+    options = {
+        evaluate: true,
+        unused: true,
+    }
+    input: {
+        let { 3: x } = { [1 + 2]: 42 };
+        console.log(x);
+    }
+    expect: {
+        let { 3: x } = { [3]: 42 };
+        console.log(x);
+    }
+    expect_stdout: "42"
+    node_version: ">=6"
+}
+
+destructuring_decl_of_computed_key: {
+    options = {
+        evaluate: true,
+        unused: true,
+    }
+    input: {
+        let four = 4;
+        let { [7 - four]: x } = { [1 + 2]: 42 };
+        console.log(x);
+    }
+    expect: {
+        let four = 4;
+        let { [7 - four]: x } = { [3]: 42 };
+        console.log(x);
+    }
+    expect_stdout: "42"
+    node_version: ">=6"
+}
+
+destructuring_assign_of_numeric_key: {
+    options = {
+        evaluate: true,
+        unused: true,
+    }
+    input: {
+        let x;
+        ({ 3: x } = { [1 + 2]: 42 });
+        console.log(x);
+    }
+    expect: {
+        let x;
+        ({ 3: x } = { [3]: 42 });
+        console.log(x);
+    }
+    expect_stdout: "42"
+    node_version: ">=6"
+}
+
+destructuring_assign_of_computed_key: {
+    options = {
+        evaluate: true,
+        unused: true,
+    }
+    input: {
+        let x;
+        let four = 4;
+        ({ [(5 + 2) - four]: x } = { [1 + 2]: 42 });
+        console.log(x);
+    }
+    expect: {
+        let x;
+        let four = 4;
+        ({ [7 - four]: x } = { [3]: 42 });
+        console.log(x);
+    }
+    expect_stdout: "42"
+    node_version: ">=6"
+}
+
+mangle_destructuring_decl: {
+    options = {
+        evaluate: true,
+        unused: true,
+    }
+    mangle = {
+    }
+    input: {
+        function test(opts) {
+            let a = opts.a || { e: 7, n: 8 };
+            let { t, e, n, s =  5 + 4, o, r } = a;
+            console.log(t, e, n, s, o, r);
+        }
+        test({a: { t: 1, e: 2, n: 3, s: 4, o: 5, r: 6 }});
+        test({});
+    }
+    expect: {
+        function test(t) {
+            let e = t.a || { e: 7, n: 8 };
+            let {t: n,  e: o,  n: s,  s: l = 9,  o: a,  r: c} = e;
+            console.log(n, o, s, l, a, c);
+        }
+        test({ a: { t: 1, e: 2, n: 3, s: 4, o: 5, r: 6 } });
+        test({});
+    }
+    expect_stdout: [
+        "1 2 3 4 5 6",
+        "undefined 7 8 9 undefined undefined",
+    ]
+    node_version: ">=6"
+}
+
+mangle_destructuring_assign_toplevel_true: {
+    options = {
+        toplevel: true,
+        evaluate: true,
+        unused: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        function test(opts) {
+            let s, o, r;
+            let a = opts.a || { e: 7, n: 8 };
+            ({ t, e, n, s =  5 + 4, o, r } = a);
+            console.log(t, e, n, s, o, r);
+        }
+        let t, e, n;
+        test({a: { t: 1, e: 2, n: 3, s: 4, o: 5, r: 6 }});
+        test({});
+    }
+    expect: {
+        function e(e) {
+            let l, s, a;
+            let c = e.a || { e: 7, n: 8 };
+            ({t: n,  e: o,  n: t,  s: l = 9,  o: s,  r: a} = c);
+            console.log(n, o, t, l, s, a);
+        }
+        let n, o, t;
+        e({ a: { t: 1, e: 2, n: 3, s: 4, o: 5, r: 6 } });
+        e({});
+    }
+    expect_stdout: [
+        "1 2 3 4 5 6",
+        "undefined 7 8 9 undefined undefined",
+    ]
+    node_version: ">=6"
+}
+
+mangle_destructuring_assign_toplevel_false: {
+    options = {
+        toplevel: false,
+        evaluate: true,
+        unused: true,
+    }
+    mangle = {
+        toplevel: false,
+    }
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        function test(opts) {
+            let s, o, r;
+            let a = opts.a || { e: 7, n: 8 };
+            ({ t, e, n, s = 9, o, r } = a);
+            console.log(t, e, n, s, o, r);
+        }
+        let t, e, n;
+        test({a: { t: 1, e: 2, n: 3, s: 4, o: 5, r: 6 }});
+        test({});
+    }
+    expect: {
+        function test(o) {
+            let s, l, a;
+            let c = o.a || { e: 7, n: 8 };
+            ({t,  e,  n,  s = 9,  o: l,  r: a} = c);
+            console.log(t, e, n, s, l, a);
+        }
+        let t, e, n;
+        test({ a: { t: 1, e: 2, n: 3, s: 4, o: 5, r: 6 } });
+        test({});
+    }
+    expect_stdout: [
+        "1 2 3 4 5 6",
+        "undefined 7 8 9 undefined undefined",
+    ]
+    node_version: ">=6"
+}
+
+mangle_destructuring_decl_array: {
+    options = {
+        evaluate: true,
+        unused: true,
+        toplevel: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        var [, t, e, n, s, o = 2, r = [ 1 + 2 ]] = [ 9, 8, 7, 6 ];
+        console.log(t, e, n, s, o, r);
+    }
+    expect: {
+        var [, o,  l,  a,  c,  e = 2,  g = [ 3 ]] = [ 9, 8, 7, 6 ];
+        console.log(o, l, a, c, e, g);
+    }
+    expect_stdout: "8 7 6 undefined 2 [ 3 ]"
+    node_version: ">=6"
+}
+
+anon_func_with_destructuring_args: {
+    options = {
+        evaluate: true,
+        unused: true,
+        toplevel: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    beautify = {
+        ecma: 5,
+    }
+    input: {
+        (function({foo = 1 + 0, bar = 2}, [car = 3, far = 4]) {
+            console.log(foo, bar, car, far);
+        })({bar: 5 - 0}, [, 6]);
+    }
+    expect: {
+        (function({foo: o = 1, bar: n = 2}, [a = 3, b = 4]) {
+            console.log(o, n, a, b);
+        })({bar: 5}, [, 6]);
+    }
+    expect_stdout: "1 5 3 6"
+    node_version: ">=6"
+}
+
+arrow_func_with_destructuring_args: {
+    options = {
+        evaluate: true,
+        unused: true,
+        toplevel: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    beautify = {
+        ecma: 5,
+    }
+    input: {
+        (({foo = 1 + 0, bar = 2}, [car = 3, far = 4]) => {
+            console.log(foo, bar, car, far);
+        })({bar: 5 - 0}, [, 6]);
+    }
+    expect: {
+        (({foo: o = 1, bar: a = 2}, [b = 3, l = 4]) => {
+            console.log(o, a, b, l);
+        })({bar: 5}, [, 6]);
+    }
+    expect_stdout: "1 5 3 6"
+    node_version: ">=6"
+}
+
+issue_2044_ecma_5: {
+    beautify = {
+        beautify: false,
+        ecma: 5,
+    }
+    input: {
+        ({x : a = 1, y = 2 + b, z = 3 - c} = obj);
+    }
+    expect_exact: "({x:a=1,y:y=2+b,z:z=3-c}=obj);"
+}
+
+issue_2044_ecma_6: {
+    beautify = {
+        beautify: false,
+        ecma: 6,
+    }
+    input: {
+        ({x : a = 1, y = 2 + b, z = 3 - c} = obj);
+    }
+    expect_exact: "({x:a=1,y=2+b,z=3-c}=obj);"
+}
+
+issue_2044_ecma_5_beautify: {
+    beautify = {
+        beautify: true,
+        ecma: 5,
+    }
+    input: {
+        ({x : a = 1, y = 2 + b, z = 3 - c} = obj);
+    }
+    expect_exact: "({x: a = 1, y: y = 2 + b, z: z = 3 - c} = obj);"
+}
+
+issue_2044_ecma_6_beautify: {
+    beautify = {
+        beautify: true,
+        ecma: 6,
+    }
+    input: {
+        ({x : a = 1, y = 2 + b, z = 3 - c} = obj);
+    }
+    expect_exact: "({x: a = 1, y = 2 + b, z = 3 - c} = obj);"
+}
+
+issue_2140: {
+    options = {
+        unused: true,
+    }
+    input: {
+        !function() {
+            var t = {};
+            console.log(([t.a] = [42])[0]);
+        }();
+    }
+    expect: {
+        !function() {
+            var t = {};
+            console.log(([t.a] = [42])[0]);
+        }();
+    }
+    expect_stdout: "42"
+    node_version: ">=6"
+}

test/compress/directives.js

@@ -1,131 +1,10 @@
-simple_statement_is_not_a_directive: {
+class_directives_compression: {
     input: {
-        "use strict"
-            .split(" ")
-            .forEach(function(s) {
-                console.log(s);
-            });
-        console.log(!this); // is strict mode?
-        (function() {
-            "directive"
-            ""
-            "use strict"
-            "hello world"
-                .split(" ")
-                .forEach(function(s) {
-                    console.log(s);
-                });
-            console.log(!this); // is strict mode?
-        })();
-    }
-    expect: {
-        "use strict".split(" ").forEach(function(s) {
-            console.log(s);
-        });
-        console.log(!this);
-        (function() {
-            "directive";
-            "";
-            "use strict";
-            "hello world".split(" ").forEach(function(s) {
-                console.log(s);
-            });
-            console.log(!this);
-        })();
-    }
-    expect_stdout: [
-        "use",
-        "strict",
-        "false",
-        "hello",
-        "world",
-        "true",
-    ]
-}
-
-drop_lone_use_strict: {
-    options = {
-        directives: true,
-        unused: true,
-    }
-    input: {
-        function f1() {
-            "use strict";
-        }
-        function f2() {
-            "use strict";
-            function f3() {
+        class foo {
+            foo() {
                 "use strict";
             }
         }
-        (function f4() {
-            "use strict";
-        })();
-    }
-    expect: {
-        function f1() {
-        }
-        function f2() {
-        }
-        (function() {})();
     }
-}
-
-issue_3166: {
-    options = {
-        directives: true,
-    }
-    input: {
-        "foo";
-        "use strict";
-        function f() {
-            "use strict";
-            "bar";
-            "use asm";
-        }
-    }
-    expect: {
-        "use strict";
-        function f() {
-            "use asm";
-        }
-    }
-}
-
-valid_after_invalid_1: {
-    input: {
-        console.log(typeof function() {
-            "use\x20strict";
-            "use strict";
-            return this;
-        }());
-    }
-    expect: {
-        console.log(typeof function() {
-            "use\x20strict";
-            "use strict";
-            return this;
-        }());
-    }
-    expect_stdout: "undefined"
-}
-
-valid_after_invalid_2: {
-    options = {
-        directives: true,
-    }
-    input: {
-        console.log(typeof function() {
-            "use\x20strict";
-            "use strict";
-            return this;
-        }());
-    }
-    expect: {
-        console.log(typeof function() {
-            "use strict";
-            return this;
-        }());
-    }
-    expect_stdout: "undefined"
+    expect_exact: "class foo{foo(){}}"
 }

test/compress/drop-console.js

@@ -1,5 +1,5 @@
 drop_console_1: {
-    options = {}
+    options = {};
     input: {
         console.log('foo');
         console.log.apply(console, arguments);
@@ -11,9 +11,7 @@ drop_console_1: {
 }
 
 drop_console_2: {
-    options = {
-        drop_console: true,
-    }
+    options = { drop_console: true };
     input: {
         console.log('foo');
         console.log.apply(console, arguments);

test/compress/expansions.js

@@ -0,0 +1,71 @@
+
+expand_arguments: {
+    input: {
+        func(a, ...rest);
+        func(...all);
+    }
+    expect_exact: "func(a,...rest);func(...all);"
+}
+
+expand_expression_arguments: {
+    input: {
+        f(...a.b);
+        f(...a.b());
+        f(...(a));
+        f(...(a.b));
+        f(...a[i]);
+    }
+    expect_exact: "f(...a.b);f(...a.b());f(...a);f(...a.b);f(...a[i]);"
+}
+
+expand_parameters: {
+    input: {
+        (function (a, ...b){});
+        (function (...args){});
+    }
+    expect_exact: "(function(a,...b){});(function(...args){});"
+}
+
+avoid_spread_in_ternary: {
+    options = {
+        comparisons: true,
+        conditionals: true,
+        evaluate: true,
+    }
+    input: {
+        function print(...x) {
+            console.log(...x);
+        }
+        var a = [1, 2], b = [3, 4], m = Math;
+
+        if (m)
+            print(a);
+        else
+            print(b);
+
+        if (m)
+            print(...a);
+        else
+            print(b);
+
+        if (m.no_such_property)
+            print(a);
+        else
+            print(...b);
+    }
+    expect: {
+        function print(...x) {
+            console.log(...x);
+        }
+        var a = [ 1, 2 ], b = [ 3, 4 ], m = Math;
+        print(m ? a : b);
+        m ? print(...a) : print(b);
+        m.no_such_property ? print(a) : print(...b);
+    }
+    expect_stdout: [
+        "[ 1, 2 ]",
+        "1 2",
+        "3 4",
+    ]
+    node_version: ">=6"
+}

test/compress/export.js

@@ -0,0 +1,446 @@
+issue_2038_1: {
+    options = {
+        toplevel: true,
+        unused: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export var V = 1;
+        export let L = 2;
+        export const C = 3;
+    }
+    expect: {
+        export var V = 1;
+        export let L = 2;
+        export const C = 3;
+    }
+}
+
+issue_2038_2: {
+    options = {
+        toplevel: true,
+        unused: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        let LET = 1;
+        const CONST = 2;
+        var VAR = 3;
+        export { LET, CONST, VAR };
+    }
+    expect: {
+        let t = 1;
+        const e = 2;
+        var o = 3;
+        export { t as LET, e as CONST, o as VAR };
+    }
+}
+
+issue_2126: {
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        import { foo as bar, cat as dog } from "stuff";
+        console.log(bar, dog);
+        export { bar as qux };
+        export { dog };
+    }
+    expect: {
+        import { foo as o, cat as s } from "stuff";
+        console.log(o, s);
+        export { o as qux };
+        export { s as dog };
+    }
+}
+
+beautify: {
+    beautify = {
+        beautify: true,
+    }
+    input: {
+        export { A as B, C as D };
+    }
+    expect_exact: "export { A as B, C as D };"
+}
+
+issue_2131: {
+    options = {
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        function no() {
+            console.log(42);
+        }
+        function go() {
+            console.log(42);
+        }
+        var X = 1, Y = 2;
+        export function main() {
+            go(X);
+        };
+    }
+    expect: {
+        function go() {
+            console.log(42);
+        }
+        var X = 1;
+        export function main() {
+            go(X);
+        };
+    }
+}
+
+issue_2129: {
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export const { keys } = Object;
+    }
+    expect: {
+        export const { keys } = Object;
+    }
+}
+
+async_func: {
+    options = {
+        keep_fargs: false,
+        unused: true,
+    }
+    input: {
+        export async function Foo(x){};
+    }
+    expect: {
+        export async function Foo(){};
+    }
+}
+
+issue_2134_1: {
+    options = {
+        keep_fargs: false,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        export function Foo(x){};
+        Foo.prototype = {};
+    }
+    expect: {
+        export function Foo(){};
+        Foo.prototype = {};
+    }
+}
+
+issue_2134_2: {
+    options = {
+        keep_fargs: false,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        export async function Foo(x){};
+        Foo.prototype = {};
+    }
+    expect: {
+        export async function Foo(){};
+        Foo.prototype = {};
+    }
+}
+
+redirection: {
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        let foo = 1, bar = 2;
+        export { foo as delete };
+        export { bar as default };
+        export { foo as var } from "module.js";
+    }
+    expect: {
+        let e = 1, o = 2;
+        export { e as delete };
+        export { o as default };
+        export { foo as var } from "module.js";
+    }
+}
+
+keyword_invalid_1: {
+    input: {
+        export { default };
+    }
+    expect: {
+        export { default };
+    }
+}
+
+keyword_invalid_2: {
+    input: {
+        export { default as Alias };
+    }
+    expect: {
+        export { default as Alias };
+    }
+}
+
+keyword_invalid_3: {
+    input: {
+        export { default as default };
+    }
+    expect: {
+        export { default as default };
+    }
+}
+
+keyword_valid_1: {
+    input: {
+        export { default } from "module.js";
+    }
+    expect: {
+        export { default } from "module.js";
+    }
+}
+
+keyword_valid_2: {
+    input: {
+        export { default as Alias } from "module.js";
+    }
+    expect: {
+        export { default as Alias } from "module.js";
+    }
+}
+
+keyword_valid_3: {
+    input: {
+        export { default as default } from "module.js";
+    }
+    expect: {
+        export { default as default } from "module.js";
+    }
+}
+
+dynamic_import: {
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        import traditional from './traditional.js';
+        function imp(x) {
+            return import(x);
+        }
+        import("module_for_side_effects.js");
+        let dynamic = import("some/module.js");
+        dynamic.foo();
+    }
+    expect: {
+        import o from "./traditional.js";
+        function t(o) {
+            return import(o);
+        }
+        import("module_for_side_effects.js");
+        let r = import("some/module.js");
+        r.foo();
+    }
+}
+
+trailing_comma: {
+    beautify = {
+        beautify: true,
+    }
+    input: {
+        export const a = 1;
+    }
+    expect_exact: "export const a = 1;"
+}
+
+export_default_anonymous_function: {
+    options = {
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export default function () {
+            foo();
+        }
+    }
+    expect_exact: "export default function(){foo()};"
+}
+
+export_default_arrow: {
+    options = {
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export default () => foo();
+    }
+    expect_exact: "export default()=>foo();"
+}
+
+export_default_anonymous_generator: {
+    options = {
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export default function * () {
+            yield foo();
+        }
+    }
+    expect_exact: "export default function*(){yield foo()};"
+}
+
+export_default_anonymous_async_function: {
+    options = {
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export default async function() {
+            return await foo();
+        }
+    }
+    expect_exact: "export default async function(){return await foo()};"
+}
+
+export_default_async_arrow_function: {
+    options = {
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export default async () => await foo();
+    }
+    expect_exact: "export default async()=>await foo();"
+}
+
+export_default_named_generator: {
+    options = {
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export default function * gen() {
+            yield foo();
+        }
+    }
+    expect_exact: "export default function*gen(){yield foo()};"
+}
+
+export_default_named_async_function: {
+    options = {
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export default async function bar() {
+            return await foo();
+        }
+    }
+    expect_exact: "export default async function bar(){return await foo()};"
+}
+
+export_default_anonymous_class: {
+    options = {
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export default class {
+            constructor() {
+                foo();
+            }
+        };
+    }
+    expect_exact: "export default class{constructor(){foo()}};"
+}
+
+export_default_anonymous_function_not_call: {
+    options = {
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export default function(){}(foo);
+    }
+    // FIXME: should be `export default function(){};foo;`
+    expect_exact: "export default function(){}(foo);"
+}
+
+export_default_anonymous_generator_not_call: {
+    options = {
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export default function*(){}(foo);
+    }
+    // agrees with `acorn` and `babylon 7`
+    expect_exact: "export default function*(){};foo;"
+}
+
+export_default_anonymous_async_function_not_call: {
+    options = {
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export default async function(){}(foo);
+    }
+    // agrees with `acorn` and `babylon 7`
+    expect_exact: "export default async function(){};foo;"
+}

test/compress/expression.js

@@ -0,0 +1,52 @@
+pow: {
+    input: {
+        var a = 2 ** 7;
+        var b = 3;
+        b **= 2;
+    }
+    expect: {
+        var a = 2 ** 7;
+        var b = 3;
+        b **= 2;
+    }
+}
+
+pow_with_number_constants: {
+    input: {
+        var a = 5 ** NaN;
+        var b = 42 ** +0;
+        var c = 42 ** -0;
+        var d = NaN ** 1;
+        var e = 2 ** Infinity;
+        var f = 2 ** -Infinity;
+    }
+    expect: {
+        var a = 5 ** NaN;
+        var b = 42 ** +0;
+        var c = 42 ** -0;
+        var d = NaN ** 1;
+        var e = 2 ** (1/0);
+        var f = 2 ** (-1/0);
+    }
+}
+
+pow_with_parentheses: {
+    input: {
+        var g = (-7) ** (0.5);
+        var h = 2324334 ** 34343443;
+        var i = (-2324334) ** 34343443;
+        var j = 2 ** (-3);
+        var k = 2.0 ** -3;
+        var l = 2.0 ** (5 - 7);
+    }
+    expect_exact: "var g=(-7)**.5;var h=2324334**34343443;var i=(-2324334)**34343443;var j=2**-3;var k=2**-3;var l=2**(5-7);"
+}
+
+pow_with_unary_between_brackets: {
+    input: {
+        var a = (-(+5)) ** 3;
+    }
+    expect: {
+        var a = (-+5)**3;
+    }
+}

test/compress/global_defs.js

@@ -2,7 +2,7 @@ must_replace: {
     options = {
         global_defs: {
             D: "foo bar",
-        },
+        }
     }
     input: {
         console.log(D);
@@ -12,20 +12,6 @@ must_replace: {
     }
 }
 
-repeated_nodes: {
-    options = {
-        global_defs: {
-            "@N": "rand()",
-        },
-    }
-    input: {
-        console.log(N, N);
-    }
-    expect: {
-        console.log(rand(), rand());
-    }
-}
-
 keyword: {
     options = {
         global_defs: {
@@ -135,7 +121,7 @@ mixed: {
         properties: true,
     }
     input: {
-        var FOO = { BAR: 0 };
+        const FOO = { BAR: 0 };
         console.log(FOO.BAR);
         console.log(++CONFIG.DEBUG);
         console.log(++CONFIG.VALUE);
@@ -145,7 +131,7 @@ mixed: {
         console.log(CONFIG);
     }
     expect: {
-        var FOO = { BAR: 0 };
+        const FOO = { BAR: 0 };
         console.log("moo");
         console.log(++CONFIG.DEBUG);
         console.log(++CONFIG.VALUE);
@@ -155,8 +141,9 @@ mixed: {
         console.log(CONFIG);
     }
     expect_warnings: [
-        "WARN: global_defs CONFIG.VALUE redefined [test/compress/global_defs.js:4,22]",
-        "WARN: global_defs CONFIG.VALUE redefined [test/compress/global_defs.js:7,8]",
+        'WARN: global_defs CONFIG.VALUE redefined [test/compress/global_defs.js:127,22]',
+        'WARN: global_defs CONFIG.VALUE redefined [test/compress/global_defs.js:128,22]',
+        'WARN: global_defs CONFIG.VALUE redefined [test/compress/global_defs.js:130,8]',
     ]
 }
 
@@ -210,23 +197,3 @@ issue_2167: {
         doWork();
     }
 }
-
-issue_3217: {
-    options = {
-        collapse_vars: true,
-        global_defs: {
-            "@o": "{fn:function(){var a=42;console.log(a)}}",
-        },
-        inline: true,
-        properties: true,
-        reduce_vars: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        o.fn();
-    }
-    expect: {
-        console.log(42);
-    }
-}

test/compress/hoist.js

@@ -0,0 +1,85 @@
+
+hoist_vars: {
+    options = {
+        hoist_vars: true
+    }
+    input: {
+        function a() {
+            bar();
+            var var1;
+            var var2;
+        }
+        function b(anArg) {
+            bar();
+            var var1;
+            var anArg;
+        }
+    }
+    expect: {
+        function a() {
+            var var1, var2;  // Vars go up and are joined
+            bar();
+        }
+        function b(anArg) {
+            var var1;
+            bar();
+            // But vars named like arguments go away!
+        }
+    }
+}
+
+hoist_funs: {
+    options = {
+        hoist_funs: true
+    }
+    input: {
+        function a() {
+            bar();
+            function foo() {}
+        }
+    }
+    expect: {
+        function a() {
+            function foo() {}  // Funs go up
+            bar();
+        }
+    }
+}
+
+hoist_no_destructurings: {
+    options = {
+        hoist_vars: true,
+        hoist_funs: true
+    }
+    input: {
+        function a([anArg]) {
+            bar();
+            var var1;
+            var anArg;  // Because anArg is already declared, this goes away!
+        }
+    }
+    expect: {
+        function a([anArg]) {
+            var var1;
+            bar();
+        }
+    }
+}
+
+dont_hoist_var_destructurings: {
+    options = {
+        hoist_vars: true,
+        hoist_funs: true
+    }
+    input: {
+        function x() {
+            // If foo is null or undefined, this should be an exception
+            var {x,y} = foo;
+        }
+    }
+    expect: {
+        function x() {
+            var {x,y} = foo;
+        }
+    }
+}

test/compress/hoist_props.js

@@ -1,8 +1,8 @@
 issue_2377_1: {
     options = {
         evaluate: true,
-        hoist_props: true,
         inline: true,
+        hoist_props: true,
         reduce_funcs: true,
         reduce_vars: true,
         toplevel: true,
@@ -33,8 +33,8 @@ issue_2377_1: {
 issue_2377_2: {
     options = {
         evaluate: true,
-        hoist_props: true,
         inline: true,
+        hoist_props: true,
         passes: 2,
         reduce_funcs: true,
         reduce_vars: true,
@@ -64,8 +64,8 @@ issue_2377_2: {
 issue_2377_3: {
     options = {
         evaluate: true,
-        hoist_props: true,
         inline: true,
+        hoist_props: true,
         passes: 4,
         reduce_funcs: true,
         reduce_vars: true,
@@ -239,14 +239,14 @@ name_collision_2: {
     input: {
         var o = {
             p: 1,
-            "+": function(x) {
+            0: function(x) {
                 return x;
             },
-            "-": function(x) {
+            1: function(x) {
                 return x + 1;
             }
         }, o__$0 = 2, o__$1 = 3;
-        console.log(o.p === o.p, o["+"](4), o["-"](5), o__$0, o__$1);
+        console.log(o.p === o.p, o[0](4), o[1](5), o__$0, o__$1);
     }
     expect: {
         var o_p = 1,
@@ -273,14 +273,14 @@ name_collision_3: {
     input: {
         var o = {
             p: 1,
-            "+": function(x) {
+            0: function(x) {
                 return x;
             },
-            "-": function(x) {
+            1: function(x) {
                 return x + 1;
             }
         }, o__$0 = 2, o__$1 = 3;
-        console.log(o.p === o.p, o["+"](4), o["-"](5));
+        console.log(o.p === o.p, o[0](4), o[1](5));
     }
     expect: {
         var o_p = 1,
@@ -383,6 +383,124 @@ contains_this_3: {
     expect_stdout: "1 1 true"
 }
 
+hoist_class: {
+    options = {
+        comparisons: true,
+        evaluate: true,
+        hoist_props: true,
+        inline: true,
+        keep_classnames: true,
+        keep_fnames: true,
+        passes: 2,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        function run(c, v) {
+            return new c(v).value;
+        }
+        var o = {
+            p: class Foo {
+                constructor(value) {
+                    this.value = value * 10;
+                }
+            },
+            x: 1,
+            y: 2,
+        };
+        console.log(o.p.name, o.p === o.p, run(o.p, o.x), run(o.p, o.y));
+    }
+    expect: {
+        function run(c, v) {
+            return new c(v).value;
+        }
+        var o_p = class Foo {
+            constructor(value) {
+                this.value = 10 * value;
+            }
+        };
+        console.log(o_p.name, true, run(o_p, 1), run(o_p, 2));
+    }
+    node_version: ">=6"
+    expect_stdout: "Foo true 10 20"
+}
+
+hoist_class_with_new: {
+    options = {
+        comparisons: true,
+        evaluate: true,
+        hoist_props: true,
+        inline: true,
+        keep_classnames: true,
+        keep_fnames: true,
+        passes: 2,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = {
+            p: class Foo {
+                constructor(value) {
+                    this.value = value * 10;
+                }
+            },
+            x: 1,
+            y: 2,
+        };
+        console.log(o.p.name, o.p === o.p, new o.p(o.x).value, new o.p(o.y).value);
+    }
+    expect: {
+        var o_p = class Foo {
+            constructor(value) {
+                this.value = 10 * value;
+            }
+        };
+        console.log(o_p.name, true, new o_p(1).value, new o_p(2).value);
+    }
+    node_version: ">=6"
+    expect_stdout: "Foo true 10 20"
+}
+
+hoist_function_with_call: {
+    options = {
+        comparisons: true,
+        evaluate: true,
+        hoist_props: true,
+        inline: true,
+        keep_fnames: true,
+        passes: 2,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = {
+            p: function Foo(value) {
+                return 10 * value;
+            },
+            x: 1,
+            y: 2
+        };
+        console.log(o.p.name, o.p === o.p, o.p(o.x), o.p(o.y));
+    }
+    expect: {
+        var o = {
+            p: function Foo(value) {
+                return 10 * value;
+            },
+            x: 1,
+            y: 2
+        };
+        console.log(o.p.name, o.p == o.p, o.p(o.x), o.p(o.y));
+    }
+    expect_stdout: "Foo true 10 20"
+}
+
 new_this: {
     options = {
         evaluate: true,
@@ -412,14 +530,31 @@ new_this: {
     expect_stdout: "1 2"
 }
 
+issue_2462: {
+    options = {
+        hoist_props: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+    }
+    input: {
+        export const Foo = {
+            a: 1,
+            b: () => 2
+        };
+    }
+    expect: {
+        export const Foo = {
+            a: 1,
+            b: () => 2
+        };
+    }
+}
+
 issue_2473_1: {
     options = {
         hoist_props: false,
         reduce_vars: true,
-        top_retain: [
-            "x",
-            "y"
-        ],
+        top_retain: [ "x", "y" ],
         toplevel: true,
         unused: true,
     }
@@ -438,10 +573,7 @@ issue_2473_2: {
     options = {
         hoist_props: true,
         reduce_vars: true,
-        top_retain: [
-            "x",
-            "y"
-        ],
+        top_retain: [ "x", "y" ],
         toplevel: true,
         unused: true,
     }
@@ -640,6 +772,31 @@ issue_2508_5: {
     expect_stdout: true
 }
 
+issue_2508_6: {
+    options = {
+        collapse_vars: true,
+        hoist_props: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = {
+            f: x => {
+                console.log(x);
+            }
+        };
+        o.f(o.f);
+    }
+    expect: {
+        var o_f = x => {
+            console.log(x);
+        };
+        o_f(o_f);
+    }
+    expect_stdout: true
+}
+
 issue_2519: {
     options = {
         collapse_vars: true,
@@ -664,380 +821,9 @@ issue_2519: {
     }
     expect: {
         function testFunc() {
-            return +((6 + 5) / 2);
+            return 1 * ((6 + 5) / 2);
         }
         console.log(testFunc());
     }
     expect_stdout: "5.5"
 }
-
-undefined_key: {
-    options = {
-        evaluate: true,
-        hoist_props: true,
-        join_vars: true,
-        passes: 4,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var a, o = {};
-        o[a] = 1;
-        o.b = 2;
-        console.log(o[a] + o.b);
-    }
-    expect: {
-        console.log(3);
-    }
-    expect_stdout: "3"
-}
-
-issue_3021: {
-    options = {
-        hoist_props: true,
-        reduce_vars: true,
-    }
-    input: {
-        var a = 1, b = 2;
-        (function() {
-            b = a;
-            if (a++ + b--)
-                return 1;
-            return;
-            var b = {};
-        })();
-        console.log(a, b);
-    }
-    expect: {
-        var a = 1, b = 2;
-        (function() {
-            b = a;
-            if (a++ + b--)
-                return 1;
-            return;
-            var b = {};
-        })();
-        console.log(a, b);
-    }
-    expect_stdout: "2 2"
-}
-
-issue_3046: {
-    options = {
-        hoist_props: true,
-        reduce_vars: true,
-    }
-    input: {
-        console.log(function(a) {
-            do {
-                var b = {
-                    c: a++
-                };
-            } while (b.c && a);
-            return a;
-        }(0));
-    }
-    expect: {
-        console.log(function(a) {
-            do {
-                var b_c = a++;
-            } while (b_c && a);
-            return a;
-        }(0));
-    }
-    expect_stdout: "1"
-}
-
-issue_3071_1: {
-    options = {
-        evaluate: true,
-        hoist_props: true,
-        inline: true,
-        join_vars: true,
-        passes: 3,
-        reduce_vars: true,
-        sequences: true,
-        side_effects: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        (function() {
-            var obj = {};
-            obj.one = 1;
-            obj.two = 2;
-            console.log(obj.one, obj.two);
-        })();
-    }
-    expect: {
-        console.log(1, 2);
-    }
-    expect_stdout: "1 2"
-}
-
-issue_3071_2: {
-    options = {
-        hoist_props: true,
-        inline: true,
-        join_vars: true,
-        passes: 3,
-        reduce_vars: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        (function() {
-            obj = {};
-            obj.one = 1;
-            obj.two = 2;
-            console.log(obj.one, obj.two);
-            var obj;
-        })();
-    }
-    expect: {
-        console.log(1, 2);
-    }
-    expect_stdout: "1 2"
-}
-
-issue_3071_2_toplevel: {
-    options = {
-        hoist_props: true,
-        inline: true,
-        join_vars: true,
-        passes: 3,
-        reduce_vars: true,
-        sequences: true,
-        side_effects: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        (function() {
-            obj = {};
-            obj.one = 1;
-            obj.two = 2;
-            console.log(obj.one, obj.two);
-            var obj;
-        })();
-    }
-    expect: {
-        console.log(1, 2);
-    }
-    expect_stdout: "1 2"
-}
-
-issue_3071_3: {
-    options = {
-        hoist_props: true,
-        reduce_vars: true,
-    }
-    input: {
-        var c = 0;
-        (function(a, b) {
-            (function f(o) {
-                var n = 2;
-                while (--b + (o = {
-                    p: c++,
-                }) && --n > 0);
-            })();
-        })();
-        console.log(c);
-    }
-    expect: {
-        var c = 0;
-        (function(a, b) {
-            (function f(o) {
-                var n = 2;
-                while (--b + (o = {
-                    p: c++,
-                }) && --n > 0);
-            })();
-        })();
-        console.log(c);
-    }
-    expect_stdout: "2"
-}
-
-issue_3411: {
-    options = {
-        hoist_props: true,
-        reduce_vars: true,
-    }
-    input: {
-        var c = 1;
-        !function f() {
-            var o = {
-                p: --c && f()
-            };
-            +o || console.log("PASS");
-        }();
-    }
-    expect: {
-        var c = 1;
-        !function f() {
-            var o_p = --c && f();
-            +{} || console.log("PASS");
-        }();
-    }
-    expect_stdout: "PASS"
-}
-
-issue_3440: {
-    options = {
-        hoist_props: true,
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        (function() {
-            function f() {
-                console.log(o.p);
-            }
-            var o = {
-                p: "PASS",
-            };
-            return f;
-        })()();
-    }
-    expect: {
-        (function() {
-            var o_p = "PASS";
-            return function() {
-                console.log(o_p);
-            };
-        })()();
-    }
-    expect_stdout: "PASS"
-}
-
-issue_3868: {
-    options = {
-        hoist_props: true,
-        passes: 2,
-        reduce_vars: true,
-        side_effects: true,
-    }
-    input: {
-        (function(t) {
-            t = {};
-            ({
-                get p() {},
-                q: (console.log("PASS"), +t),
-            }).r;
-        })();
-    }
-    expect: {
-        (function(t) {
-            t = {};
-            ({
-                get p() {},
-                q: (console.log("PASS"), +t),
-            }).r;
-        })();
-    }
-    expect_stdout: "PASS"
-}
-
-issue_3871: {
-    options = {
-        hoist_props: true,
-        reduce_vars: true,
-    }
-    input: {
-        console.log(function() {
-            do {
-                var b = {
-                    get null() {
-                        c;
-                    }
-                };
-            } while (!b);
-            return "PASS";
-        }());
-    }
-    expect: {
-        console.log(function() {
-            do {
-                var b = {
-                    get null() {
-                        c;
-                    }
-                };
-            } while (!b);
-            return "PASS";
-        }());
-    }
-    expect_stdout: "PASS"
-}
-
-issue_3945_1: {
-    options = {
-        hoist_props: true,
-        reduce_vars: true,
-    }
-    input: {
-        function f() {
-            o.p;
-            var o = {
-                q: 0,
-            };
-        }
-    }
-    expect: {
-        function f() {
-            o.p;
-            var o = {
-                q: 0,
-            };
-        }
-    }
-}
-
-issue_3945_2: {
-    options = {
-        hoist_props: true,
-        reduce_vars: true,
-        toplevel: true,
-    }
-    input: {
-        console.log(typeof o);
-        var o = {
-            p: 0,
-        };
-    }
-    expect: {
-        console.log(typeof o);
-        var o = {
-            p: 0,
-        };
-    }
-    expect_stdout: "undefined"
-}
-
-issue_4023: {
-    options = {
-        comparisons: true,
-        hoist_props: true,
-        inline: true,
-        reduce_vars: true,
-        toplevel: true,
-        typeofs: true,
-        unused: true,
-    }
-    input: {
-        function f() {
-            var a = function() {
-                return { p: 0 };
-            }();
-            return console.log("undefined" != typeof a);
-        }
-        f();
-    }
-    expect: {
-        console.log(void 0 !== {});
-    }
-    expect_stdout: "true"
-}

test/compress/html_comments.js

@@ -1,107 +1,64 @@
 html_comment_in_expression: {
     input: {
-        (function(a, b) {
-            console.log(a < !--b && a-- > b, a, b);
-        })(1, 2);
+        function f(a, b, x, y) { return a < !--b && x-- > y; }
     }
-    expect_exact: "(function(a,b){console.log(a<! --b&&a-- >b,a,b)})(1,2);"
-    expect_stdout: "false 1 1"
+    expect_exact: "function f(a,b,x,y){return a< !--b&&x-- >y}";
 }
 
 html_comment_in_less_than: {
     input: {
-        (function(a, b, c) {
-            console.log(
-                a < !--b,
-                a < !--b + c,
-                a + b < !--c,
-                a, b, c
-            );
-        })(1, 2, 3);
+        function f(a, b) { return a < !--b; }
     }
-    expect_exact: "(function(a,b,c){console.log(a<! --b,a<! --b+c,a+b<! --c,a,b,c)})(1,2,3);"
-    expect_stdout: "false true false 1 0 2"
+    expect_exact: "function f(a,b){return a< !--b}";
 }
 
 html_comment_in_left_shift: {
     input: {
-        (function(a, b, c) {
-            console.log(
-                a << !--b,
-                a << !--b + c,
-                a + b << !--c,
-                a, b, c
-            );
-        })(1, 2, 3);
+        function f(a, b) { return a << !--b; }
     }
-    expect_exact: "(function(a,b,c){console.log(a<<! --b,a<<! --b+c,a+b<<! --c,a,b,c)})(1,2,3);"
-    expect_stdout: "1 16 1 1 0 2"
-}
-
-html_comment_in_greater_than: {
-    input: {
-        (function(a, b, c) {
-            console.log(
-                a-- > b,
-                a-- > b + c,
-                a + b-- > c,
-                a, b, c
-            );
-        })(1, 2, 3);
-    }
-    expect_exact: "(function(a,b,c){console.log(a-- >b,a-- >b+c,a+b-- >c,a,b,c)})(1,2,3);"
-    expect_stdout: "false false false -1 1 3"
-}
-
-html_comment_in_greater_than_or_equal: {
-    input: {
-        (function(a, b, c) {
-            console.log(
-                a-- >= b,
-                a-- >= b + c,
-                a + b-- >= c,
-                a, b, c
-            );
-        })(1, 2, 3);
-    }
-    expect_exact: "(function(a,b,c){console.log(a-- >=b,a-- >=b+c,a+b-- >=c,a,b,c)})(1,2,3);"
-    expect_stdout: "false false false -1 1 3"
+    expect_exact: "function f(a,b){return a<< !--b}";
 }
 
 html_comment_in_right_shift: {
     input: {
-        (function(a, b, c) {
-            console.log(
-                a-- >> b,
-                a-- >> b + c,
-                a + b-- >> c,
-                a, b, c
-            );
-        })(1, 2, 3);
+        function f(a, b) { return a-- >> b; }
     }
-    expect_exact: "(function(a,b,c){console.log(a-- >>b,a-- >>b+c,a+b-- >>c,a,b,c)})(1,2,3);"
-    expect_stdout: "0 0 0 -1 1 3"
+    expect_exact: "function f(a,b){return a-- >>b}";
 }
 
 html_comment_in_zero_fill_right_shift: {
     input: {
-        (function(a, b, c) {
-            console.log(
-                a-- >>> b,
-                a-- >>> b + c,
-                a + b-- >>> c,
-                a, b, c
-            );
-        })(1, 2, 3);
+        function f(a, b) { return a-- >>> b; }
     }
-    expect_exact: "(function(a,b,c){console.log(a-- >>>b,a-- >>>b+c,a+b-- >>>c,a,b,c)})(1,2,3);"
-    expect_stdout: "0 0 0 -1 1 3"
+    expect_exact: "function f(a,b){return a-- >>>b}";
+}
+
+html_comment_in_greater_than: {
+    input: {
+        function f(a, b) { return a-- > b; }
+    }
+    expect_exact: "function f(a,b){return a-- >b}";
+}
+
+html_comment_in_greater_than_or_equal: {
+    input: {
+        function f(a, b) { return a-- >= b; }
+    }
+    expect_exact: "function f(a,b){return a-- >=b}";
 }
 
 html_comment_in_string_literal: {
     input: {
-        console.log("<!--HTML-->comment in<!--string literal-->".length);
+        function f() { return "<!--HTML-->comment in<!--string literal-->"; }
     }
-    expect_exact: 'console.log("\\x3c!--HTML--\\x3ecomment in\\x3c!--string literal--\\x3e".length);'
-    expect_stdout: "42"
+    expect_exact: 'function f(){return"\\x3c!--HTML--\\x3ecomment in\\x3c!--string literal--\\x3e"}';
+}
+
+html_comment_after_multiline_comment: {
+    input: {
+        var foo; /*
+*/-->   var bar;
+        var foobar;
+    }
+    expect_exact: "var foo;var foobar;"
 }

test/compress/if_return.js

@@ -1,14 +1,14 @@
 if_return_1: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        if_return    : true,
+        sequences    : true,
+        conditionals : true,
+        comparisons  : true,
+        evaluate     : true,
+        booleans     : true,
+        unused       : true,
+        side_effects : true,
+        dead_code    : true,
     }
     input: {
         function f(x) {
@@ -24,15 +24,15 @@ if_return_1: {
 
 if_return_2: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        if_return    : true,
+        sequences    : true,
+        conditionals : true,
+        comparisons  : true,
+        evaluate     : true,
+        booleans     : true,
+        unused       : true,
+        side_effects : true,
+        dead_code    : true,
     }
     input: {
         function f(x, y) {
@@ -49,15 +49,15 @@ if_return_2: {
 
 if_return_3: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        if_return    : true,
+        sequences    : true,
+        conditionals : true,
+        comparisons  : true,
+        evaluate     : true,
+        booleans     : true,
+        unused       : true,
+        side_effects : true,
+        dead_code    : true,
     }
     input: {
         function f(x) {
@@ -75,15 +75,15 @@ if_return_3: {
 
 if_return_4: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        if_return    : true,
+        sequences    : true,
+        conditionals : true,
+        comparisons  : true,
+        evaluate     : true,
+        booleans     : true,
+        unused       : true,
+        side_effects : true,
+        dead_code    : true,
     }
     input: {
         function f(x, y) {
@@ -100,15 +100,15 @@ if_return_4: {
 
 if_return_5: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        if_return    : true,
+        sequences    : true,
+        conditionals : true,
+        comparisons  : true,
+        evaluate     : true,
+        booleans     : true,
+        unused       : true,
+        side_effects : true,
+        dead_code    : true,
     }
     input: {
         function f() {
@@ -126,15 +126,15 @@ if_return_5: {
 
 if_return_6: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        if_return    : true,
+        sequences    : true,
+        conditionals : true,
+        comparisons  : true,
+        evaluate     : true,
+        booleans     : true,
+        unused       : true,
+        side_effects : true,
+        dead_code    : true,
     }
     input: {
         function f(x) {
@@ -150,15 +150,15 @@ if_return_6: {
 
 if_return_7: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        if_return    : true,
+        sequences    : true,
+        conditionals : true,
+        comparisons  : true,
+        evaluate     : true,
+        booleans     : true,
+        unused       : true,
+        side_effects : true,
+        dead_code    : true,
     }
     input: {
         function f(x) {
@@ -176,10 +176,10 @@ if_return_7: {
 
 if_return_8: {
     options = {
-        conditionals: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
+        if_return:     true,
+        sequences:     true,
+        conditionals:  true,
+        side_effects : true,
     }
     input: {
         function f(e) {
@@ -220,15 +220,15 @@ if_return_8: {
 
 issue_1089: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
+        if_return    : true,
+        sequences    : true,
+        conditionals : true,
+        comparisons  : true,
+        evaluate     : true,
+        booleans     : true,
+        unused       : true,
+        side_effects : true,
+        dead_code    : true,
     }
     input: {
         function x() {
@@ -243,7 +243,7 @@ issue_1089: {
     expect: {
         function x() {
             var f = document.getElementById("fname");
-            if (12345 < f.files[0].size)
+            if (f.files[0].size > 12345)
                 return alert("alert"), f.focus(), !1;
         }
     }
@@ -251,9 +251,9 @@ issue_1089: {
 
 issue_1437: {
     options = {
-        conditionals: false,
-        if_return: true,
-        sequences: true,
+        if_return    : true,
+        sequences    : true,
+        conditionals : false
     }
     input: {
         function x() {
@@ -281,9 +281,9 @@ issue_1437: {
 
 issue_1437_conditionals: {
     options = {
-        conditionals: true,
-        if_return: true,
-        sequences: true,
+        conditionals : true,
+        if_return    : true,
+        sequences    : true
     }
     input: {
         function x() {
@@ -327,270 +327,60 @@ issue_512: {
     }
 }
 
-if_var_return: {
-    options = {
-        conditionals: true,
-        if_return: true,
-        join_vars: true,
-        sequences: true,
-    }
-    input: {
-        function f() {
-            var a;
-            return;
-            var b;
-        }
-        function g() {
-            var a;
-            if (u()) {
-                var b;
-                return v();
-                var c;
-            }
-            var d;
-            if (w()) {
-                var e;
-                return x();
-                var f;
-            } else {
-                var g;
-                y();
-                var h;
-            }
-            var i;
-            z();
-            var j;
-        }
-    }
-    expect: {
-        function f() {
-            var a, b;
-        }
-        function g() {
-            var a, b, c, d, e, f, g, h, i, j;
-            return u() ? v() : w() ? x() : (y(), z(), void 0);
-        }
-    }
-}
-
-if_if_return_return: {
-    options = {
-        conditionals: true,
-        if_return: true,
-    }
-    input: {
-        function f(a, b) {
-            if (a) {
-                if (b)
-                    return b;
-                return;
-            }
-            g();
-        }
-    }
-    expect: {
-        function f(a, b) {
-            if (a)
-                return b || void 0;
-            g();
-        }
-    }
-}
-
-if_body_return_1: {
+issue_1317: {
     options = {
         if_return: true,
     }
     input: {
-        var c = "PASS";
-        function f(a, b) {
-            if (a) {
-                if (b) throw new Error(c);
-                return 42;
+        !function(a) {
+            if (a) return;
+            let b = 1;
+            function g() {
+                return b;
             }
-            return true;
-        }
-        console.log(f(0, 0));
-        console.log(f(0, 1));
-        console.log(f(1, 0));
-        try {
-            f(1, 1);
-            console.log("FAIL");
-        } catch (e) {
-            console.log(e.message);
-        }
+            console.log(g());
+        }();
     }
     expect: {
-        var c = "PASS";
-        function f(a, b) {
-            if (a) {
-                if (b) throw new Error(c);
-                return 42;
+        !function(a) {
+            if (a) return;
+            let b = 1;
+            function g() {
+                return b;
             }
-            return true;
-        }
-        console.log(f(0, 0));
-        console.log(f(0, 1));
-        console.log(f(1, 0));
-        try {
-            f(1, 1);
-            console.log("FAIL");
-        } catch (e) {
-            console.log(e.message);
-        }
-    }
-    expect_stdout: [
-        "true",
-        "true",
-        "42",
-        "PASS",
-    ]
-}
-
-if_body_return_2: {
-    options = {
-        if_return: true,
-    }
-    input: {
-        var c = "PASS";
-        function f(a, b) {
-            if (0 + a) {
-                if (b) throw new Error(c);
-                return 42;
-            }
-            return true;
-        }
-        console.log(f(0, 0));
-        console.log(f(0, 1));
-        console.log(f(1, 0));
-        try {
-            f(1, 1);
-            console.log("FAIL");
-        } catch (e) {
-            console.log(e.message);
-        }
-    }
-    expect: {
-        var c = "PASS";
-        function f(a, b) {
-            if (0 + a) {
-                if (b) throw new Error(c);
-                return 42;
-            }
-            return true;
-        }
-        console.log(f(0, 0));
-        console.log(f(0, 1));
-        console.log(f(1, 0));
-        try {
-            f(1, 1);
-            console.log("FAIL");
-        } catch (e) {
-            console.log(e.message);
-        }
-    }
-    expect_stdout: [
-        "true",
-        "true",
-        "42",
-        "PASS",
-    ]
-}
-
-if_body_return_3: {
-    options = {
-        if_return: true,
-    }
-    input: {
-        var c = "PASS";
-        function f(a, b) {
-            if (1 == a) {
-                if (b) throw new Error(c);
-                return 42;
-            }
-            return true;
-        }
-        console.log(f(0, 0));
-        console.log(f(0, 1));
-        console.log(f(1, 0));
-        try {
-            f(1, 1);
-            console.log("FAIL");
-        } catch (e) {
-            console.log(e.message);
-        }
-    }
-    expect: {
-        var c = "PASS";
-        function f(a, b) {
-            if (1 != a) return true;
-            if (b) throw new Error(c);
-            return 42;
-        }
-        console.log(f(0, 0));
-        console.log(f(0, 1));
-        console.log(f(1, 0));
-        try {
-            f(1, 1);
-            console.log("FAIL");
-        } catch (e) {
-            console.log(e.message);
-        }
-    }
-    expect_stdout: [
-        "true",
-        "true",
-        "42",
-        "PASS",
-    ]
-}
-
-issue_3600: {
-    options = {
-        if_return: true,
-        inline: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        var c = 0;
-        (function() {
-            if ([ ][c++]); else return;
-            return void function() {
-                var b = --b, a = c = 42;
-                return c;
-            }();
-        })();
-        console.log(c);
-    }
-    expect: {
-        var c = 0;
-        (function() {
-            if ([][c++]) b = --b, c = 42;
-            var b;
-        })();
-        console.log(c);
+            console.log(g());
+        }();
     }
     expect_stdout: "1"
+    node_version: ">=6"
 }
 
-iife_if_return_simple: {
+issue_1317_strict: {
     options = {
-        conditionals: true,
         if_return: true,
-        inline: true,
-        sequences: true,
-        side_effects: true,
     }
     input: {
-        (function() {
-            if (console)
-                return console.log("PASS");
-            console.log("FAIL");
-        })();
+        "use strict";
+        !function(a) {
+            if (a) return;
+            let b = 1;
+            function g() {
+                return b;
+            }
+            console.log(g());
+        }();
     }
     expect: {
-        console ? console.log("PASS") : console.log("FAIL");
+        "use strict";
+        !function(a) {
+            if (a) return;
+            let b = 1;
+            function g() {
+                return b;
+            }
+            console.log(g());
+        }();
     }
-    expect_stdout: "PASS"
+    expect_stdout: "1"
+    node_version: ">=4"
 }

test/compress/issue-1001.js

@@ -0,0 +1,8 @@
+parenthesis_strings_in_parenthesis: {
+    input: {
+        var foo = ('(');
+        a(')');
+
+    }
+    expect_exact: 'var foo="(";a(")");'
+}

test/compress/issue-1034.js

@@ -1,17 +1,8 @@
 non_hoisted_function_after_return: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: false,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
-        loops: true,
-        side_effects: true,
-        unused: true,
+        hoist_funs: false, dead_code: true, conditionals: true, comparisons: true,
+        evaluate: true, booleans: true, loops: true, unused: true, keep_fargs: true,
+        if_return: true, join_vars: true, side_effects: true
     }
     input: {
         function foo(x) {
@@ -30,35 +21,25 @@ non_hoisted_function_after_return: {
     }
     expect: {
         function foo(x) {
-            return (x ? bar : baz)();
+            return x ? bar() : baz();
             function bar() { return 7 }
             function baz() { return 8 }
         }
     }
     expect_warnings: [
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:4,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:7,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:10,12]",
-        "WARN: Dropping unused function UnusedFunction [test/compress/issue-1034.js:11,21]"
+        'WARN: Dropping unreachable code [test/compress/issue-1034.js:11,16]',
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:14,16]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:17,12]",
+        "WARN: Dropping unused function UnusedFunction [test/compress/issue-1034.js:18,21]"
     ]
 }
 
 non_hoisted_function_after_return_2a: {
     options = {
-        booleans: true,
-        collapse_vars: false,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: false,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
-        loops: true,
-        passes: 2,
-        side_effects: true,
-        unused: true,
+        hoist_funs: false, dead_code: true, conditionals: true, comparisons: true,
+        evaluate: true, booleans: true, loops: true, unused: true, keep_fargs: true,
+        if_return: true, join_vars: true, side_effects: true,
+        collapse_vars: false, passes: 2, warnings: "verbose"
     }
     input: {
         function foo(x) {
@@ -84,37 +65,28 @@ non_hoisted_function_after_return_2a: {
         }
     }
     expect_warnings: [
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:4,16]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:4,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:7,16]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:7,16]",
-        "WARN: Dropping unused variable a [test/compress/issue-1034.js:4,20]",
-        "WARN: Dropping unused function nope [test/compress/issue-1034.js:11,21]",
-        "INFO: pass 0: last_count: Infinity, count: 36",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:9,12]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:9,12]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:12,12]",
-        "INFO: Dropping unused variable b [test/compress/issue-1034.js:7,20]",
-        "INFO: Dropping unused variable c [test/compress/issue-1034.js:9,16]",
-        "INFO: pass 1: last_count: 36, count: 18",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:48,16]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:48,16]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:51,16]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:51,16]",
+        "WARN: Dropping unused variable a [test/compress/issue-1034.js:48,20]",
+        "WARN: Dropping unused function nope [test/compress/issue-1034.js:55,21]",
+        "WARN: pass 0: last_count: Infinity, count: 37",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:53,12]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:53,12]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:56,12]",
+        "WARN: Dropping unused variable b [test/compress/issue-1034.js:51,20]",
+        "WARN: Dropping unused variable c [test/compress/issue-1034.js:53,16]",
+        "WARN: pass 1: last_count: 37, count: 18",
     ]
 }
 
 non_hoisted_function_after_return_2b: {
     options = {
-        booleans: true,
-        collapse_vars: false,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: false,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
-        loops: true,
-        side_effects: true,
-        unused: true,
+        hoist_funs: false, dead_code: true, conditionals: true, comparisons: true,
+        evaluate: true, booleans: true, loops: true, unused: true, keep_fargs: true,
+        if_return: true, join_vars: true, side_effects: true,
+        collapse_vars: false
     }
     input: {
         function foo(x) {
@@ -138,28 +110,20 @@ non_hoisted_function_after_return_2b: {
         }
     }
     expect_warnings: [
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:6,16]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:6,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:8,12]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:8,12]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:12,12]",
+        // duplicate warnings no longer emitted
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:97,16]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:97,16]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:99,12]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:99,12]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:103,12]",
     ]
 }
 
 non_hoisted_function_after_return_strict: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: false,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
-        loops: true,
-        side_effects: true,
-        unused: true,
+        hoist_funs: false, dead_code: true, conditionals: true, comparisons: true,
+        evaluate: true, booleans: true, loops: true, unused: true, keep_fargs: true,
+        if_return: true, join_vars: true, side_effects: true
     }
     input: {
         "use strict";
@@ -181,7 +145,7 @@ non_hoisted_function_after_return_strict: {
     expect: {
         "use strict";
         function foo(x) {
-            return (x ? bar : baz)();
+            return x ? bar() : baz();
             function bar() { return 7 }
             function baz() { return 8 }
         }
@@ -189,29 +153,19 @@ non_hoisted_function_after_return_strict: {
     }
     expect_stdout: "8 7"
     expect_warnings: [
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:5,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:8,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:11,12]",
-        "WARN: Dropping unused function UnusedFunction [test/compress/issue-1034.js:12,21]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:133,16]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:136,16]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:139,12]",
+        "WARN: Dropping unused function UnusedFunction [test/compress/issue-1034.js:140,21]",
     ]
 }
 
 non_hoisted_function_after_return_2a_strict: {
     options = {
-        booleans: true,
-        collapse_vars: false,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: false,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
-        loops: true,
-        passes: 2,
-        side_effects: true,
-        unused: true,
+        hoist_funs: false, dead_code: true, conditionals: true, comparisons: true,
+        evaluate: true, booleans: true, loops: true, unused: true, keep_fargs: true,
+        if_return: true, join_vars: true, side_effects: true,
+        collapse_vars: false, passes: 2, warnings: "verbose"
     }
     input: {
         "use strict";
@@ -242,37 +196,28 @@ non_hoisted_function_after_return_2a_strict: {
     }
     expect_stdout: "5 6"
     expect_warnings: [
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:5,16]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:5,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:8,16]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:8,16]",
-        "WARN: Dropping unused variable a [test/compress/issue-1034.js:5,20]",
-        "WARN: Dropping unused function nope [test/compress/issue-1034.js:12,21]",
-        "INFO: pass 0: last_count: Infinity, count: 47",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:10,12]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:10,12]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:13,12]",
-        "INFO: Dropping unused variable b [test/compress/issue-1034.js:8,20]",
-        "INFO: Dropping unused variable c [test/compress/issue-1034.js:10,16]",
-        "INFO: pass 1: last_count: 47, count: 29",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:175,16]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:175,16]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:178,16]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:178,16]",
+        "WARN: Dropping unused variable a [test/compress/issue-1034.js:175,20]",
+        "WARN: Dropping unused function nope [test/compress/issue-1034.js:182,21]",
+        "WARN: pass 0: last_count: Infinity, count: 48",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:180,12]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:180,12]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:183,12]",
+        "WARN: Dropping unused variable b [test/compress/issue-1034.js:178,20]",
+        "WARN: Dropping unused variable c [test/compress/issue-1034.js:180,16]",
+        "WARN: pass 1: last_count: 48, count: 29",
     ]
 }
 
 non_hoisted_function_after_return_2b_strict: {
     options = {
-        booleans: true,
-        collapse_vars: false,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: false,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
-        loops: true,
-        side_effects: true,
-        unused: true,
+        hoist_funs: false, dead_code: true, conditionals: true, comparisons: true,
+        evaluate: true, booleans: true, loops: true, unused: true, keep_fargs: true,
+        if_return: true, join_vars: true, side_effects: true,
+        collapse_vars: false
     }
     input: {
         "use strict";
@@ -301,10 +246,11 @@ non_hoisted_function_after_return_2b_strict: {
     }
     expect_stdout: "5 6"
     expect_warnings: [
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:7,16]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:7,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:9,12]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:9,12]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:13,12]",
+        // duplicate warnings no longer emitted
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:229,16]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:229,16]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:231,12]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:231,12]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:235,12]",
     ]
 }

test/compress/issue-1041.js

@@ -1,9 +1,22 @@
+const_declaration: {
+    options = {
+        evaluate: true
+    };
+
+    input: {
+        const goog = goog || {};
+    }
+    expect: {
+        const goog = goog || {};
+    }
+}
+
 const_pragma: {
     options = {
         evaluate: true,
         reduce_funcs: true,
         reduce_vars: true,
-    }
+    };
 
     input: {
         /** @const */ var goog = goog || {};
@@ -19,7 +32,7 @@ not_const: {
         evaluate: true,
         reduce_funcs: true,
         reduce_vars: true,
-    }
+    };
 
     input: {
         var goog = goog || {};

test/compress/issue-1043.js

@@ -0,0 +1,30 @@
+issue_1043: {
+    options = {
+        side_effects: true
+    };
+
+    input: {
+        function* range(start = 0, end = null, step = 1) {
+            if (end == null) {
+                end = start;
+                start = 0;
+            }
+
+            for (let i = start; i < end; i += step) {
+                yield i;
+            }
+        }
+    }
+
+    expect: {
+        function* range(start = 0, end = null, step = 1) {
+            if (null == end) {
+                end = start;
+                start = 0;
+            }
+
+            for (let i = start; i < end; i += step)
+                yield i;
+        }
+    }
+}

test/compress/issue-1044.js

@@ -0,0 +1,9 @@
+issue_1044: {
+    options = { evaluate: true, conditionals: true };
+    input: {
+        const mixed = Base ? class extends Base {} : class {}
+    }
+    expect: {
+        const mixed = Base ? class extends Base {} : class {}
+    }
+}

test/compress/issue-1052.js

@@ -134,9 +134,8 @@ defun_hoist_funs: {
     expect: {
         function e() {
             function f() {}
-            function g() {}
             function h() {}
-            if (window);
+            if (window) function g() {}
         }
     }
 }

test/compress/issue-1105.js

@@ -1,6 +1,6 @@
 with_in_global_scope: {
     options = {
-        unused: true,
+        unused: true
     }
     input: {
         var o = 42;
@@ -18,7 +18,7 @@ with_in_global_scope: {
 }
 with_in_function_scope: {
     options = {
-        unused: true,
+        unused: true
     }
     input: {
         function foo() {
@@ -40,7 +40,7 @@ with_in_function_scope: {
 }
 compress_with_with_in_other_scope: {
     options = {
-        unused: true,
+        unused: true
     }
     input: {
         function foo() {
@@ -69,7 +69,7 @@ compress_with_with_in_other_scope: {
 }
 with_using_existing_variable_outside_scope: {
     options = {
-        unused: true,
+        unused: true
     }
     input: {
         function f() {
@@ -99,7 +99,7 @@ with_using_existing_variable_outside_scope: {
 }
 check_drop_unused_in_peer_function: {
     options = {
-        unused: true,
+        unused: true
     }
     input: {
         function outer() {
@@ -148,7 +148,7 @@ check_drop_unused_in_peer_function: {
 
 Infinity_not_in_with_scope: {
     options = {
-        unused: true,
+        unused: true
     }
     input: {
         var o = { Infinity: 'oInfinity' };
@@ -164,7 +164,7 @@ Infinity_not_in_with_scope: {
 
 Infinity_in_with_scope: {
     options = {
-        unused: true,
+        unused: true
     }
     input: {
         var o = { Infinity: 'oInfinity' };
@@ -180,19 +180,19 @@ Infinity_in_with_scope: {
 
 assorted_Infinity_NaN_undefined_in_with_scope: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: true,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
+        unused:        true,
+        evaluate:      true,
+        dead_code:     true,
+        conditionals:  true,
+        comparisons:   true,
+        booleans:      true,
+        hoist_funs:    true,
+        keep_fargs:    true,
+        if_return:     true,
+        join_vars:     true,
+        side_effects:  true,
+        sequences:     false,
         keep_infinity: false,
-        sequences: false,
-        side_effects: true,
-        unused: true,
     }
     input: {
         var f = console.log;
@@ -242,19 +242,19 @@ assorted_Infinity_NaN_undefined_in_with_scope: {
 
 assorted_Infinity_NaN_undefined_in_with_scope_keep_infinity: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: true,
-        if_return: true,
-        join_vars: true,
-        keep_fargs: true,
+        unused:        true,
+        evaluate:      true,
+        dead_code:     true,
+        conditionals:  true,
+        comparisons:   true,
+        booleans:      true,
+        hoist_funs:    true,
+        keep_fargs:    true,
+        if_return:     true,
+        join_vars:     true,
+        side_effects:  true,
+        sequences:     false,
         keep_infinity: true,
-        sequences: false,
-        side_effects: true,
-        unused: true,
     }
     input: {
         var f = console.log;

test/compress/issue-12.js

@@ -1,15 +1,11 @@
 keep_name_of_getter: {
-    options = {
-        unused: true,
-    }
+    options = { unused: true };
     input: { a = { get foo () {} } }
     expect: { a = { get foo () {} } }
 }
 
 keep_name_of_setter: {
-    options = {
-        unused: true,
-    }
+    options = { unused: true };
     input: { a = { set foo () {} } }
     expect: { a = { set foo () {} } }
 }

test/compress/issue-1202.js

@@ -1,7 +1,7 @@
 mangle_keep_fnames_false: {
     options = {
-        keep_fargs: true,
-        keep_fnames: true,
+        keep_fnames : true,
+        keep_fargs  : true,
     }
     mangle = {
         keep_fnames : false,
@@ -26,8 +26,8 @@ mangle_keep_fnames_false: {
 
 mangle_keep_fnames_true: {
     options = {
-        keep_fargs: true,
-        keep_fnames: true,
+        keep_fnames : true,
+        keep_fargs  : true,
     }
     mangle = {
         keep_fnames : true,

test/compress/issue-1212.js

@@ -0,0 +1,76 @@
+issue_1212_debug_false: {
+    options = {
+        global_defs   : { DEBUG: false },
+        sequences     : true,
+        properties    : true,
+        dead_code     : true,
+        conditionals  : true,
+        comparisons   : true,
+        evaluate      : true,
+        booleans      : true,
+        loops         : true,
+        unused        : true,
+        hoist_funs    : true,
+        keep_fargs    : true,
+        if_return     : true,
+        join_vars     : true,
+        collapse_vars : true,
+        side_effects  : true,
+    }
+    input: {
+        class foo {
+            bar() {
+                if (DEBUG)
+                    console.log("DEV");
+                else
+                    console.log("PROD");
+            }
+        }
+        new foo().bar();
+    }
+    expect: {
+        class foo{
+            bar() { console.log("PROD") }
+        }
+        (new foo).bar();
+    }
+}
+
+issue_1212_debug_true: {
+    options = {
+        global_defs   : { DEBUG: true },
+        sequences     : true,
+        properties    : true,
+        dead_code     : true,
+        conditionals  : true,
+        comparisons   : true,
+        evaluate      : true,
+        booleans      : true,
+        loops         : true,
+        unused        : true,
+        hoist_funs    : true,
+        keep_fargs    : true,
+        if_return     : true,
+        join_vars     : true,
+        collapse_vars : true,
+        side_effects  : true,
+    }
+    input: {
+        class foo {
+            bar() {
+                if (DEBUG)
+                    console.log("DEV");
+                else
+                    console.log("PROD");
+            }
+        }
+        new foo().bar();
+    }
+    expect: {
+        class foo{
+            bar() { console.log("DEV") }
+        }
+        (new foo).bar();
+    }
+}
+

test/compress/issue-1261.js

@@ -1,14 +1,14 @@
 pure_function_calls: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        evaluate: true,
-        if_return: true,
-        join_vars: true,
-        negate_iife: true,
-        side_effects: true,
-        unused: true,
+        evaluate     : true,
+        conditionals : true,
+        comparisons  : true,
+        side_effects : true,
+        booleans     : true,
+        unused       : true,
+        if_return    : true,
+        join_vars    : true,
+        negate_iife  : true,
     }
     input: {
         // pure top-level IIFE will be dropped
@@ -48,28 +48,28 @@ pure_function_calls: {
         a.b(), f.g();
     }
     expect_warnings: [
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:3,8]",
-        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:3,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:16,37]",
-        "WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:16,16]",
-        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:14,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:24,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:25,31]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:16,8]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:16,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:29,37]",
+        "WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:29,16]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:27,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:37,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:38,31]",
     ]
 }
 
 pure_function_calls_toplevel: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        evaluate: true,
-        if_return: true,
-        join_vars: true,
-        negate_iife: true,
-        side_effects: true,
-        toplevel: true,
-        unused: true,
+        evaluate     : true,
+        conditionals : true,
+        comparisons  : true,
+        side_effects : true,
+        booleans     : true,
+        unused       : true,
+        if_return    : true,
+        join_vars    : true,
+        negate_iife  : true,
+        toplevel     : true,
     }
     input: {
         // pure top-level IIFE will be dropped
@@ -110,17 +110,17 @@ pure_function_calls_toplevel: {
         a.b(), f.g();
     }
     expect_warnings: [
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:3,8]",
-        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:3,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:16,37]",
-        "WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:16,16]",
-        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:14,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:31,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:32,31]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:8,33]",
-        "WARN: Dropping unused variable iife1 [test/compress/issue-1261.js:8,12]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:24,45]",
-        "WARN: Dropping unused variable MyClass [test/compress/issue-1261.js:24,12]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:77,8]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:77,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:90,37]",
+        "WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:90,16]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:88,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:105,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:106,31]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:82,33]",
+        "WARN: Dropping unused variable iife1 [test/compress/issue-1261.js:82,12]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:98,45]",
+        "WARN: Dropping unused variable MyClass [test/compress/issue-1261.js:98,12]",
     ]
 }
 
@@ -155,29 +155,29 @@ should_warn: {
         baz();
     }
     expect_warnings: [
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:1,61]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:1,23]",
-        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:1,23]",
-        "WARN: Boolean || always true [test/compress/issue-1261.js:2,23]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:2,23]",
-        "WARN: Condition always true [test/compress/issue-1261.js:2,23]",
-        "WARN: Condition left of || always true [test/compress/issue-1261.js:3,8]",
-        "WARN: Condition always true [test/compress/issue-1261.js:3,8]",
-        "WARN: Boolean && always false [test/compress/issue-1261.js:4,23]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:4,23]",
-        "WARN: Condition always false [test/compress/issue-1261.js:4,23]",
-        "WARN: Condition left of && always false [test/compress/issue-1261.js:5,8]",
-        "WARN: Condition always false [test/compress/issue-1261.js:5,8]",
-        "WARN: + in boolean context always true [test/compress/issue-1261.js:6,23]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:6,23]",
-        "WARN: Condition always true [test/compress/issue-1261.js:6,23]",
-        "WARN: + in boolean context always true [test/compress/issue-1261.js:7,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:7,31]",
-        "WARN: Condition always true [test/compress/issue-1261.js:7,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:8,23]",
-        "WARN: Condition always true [test/compress/issue-1261.js:9,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:9,24]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:10,31]",
-        "WARN: Condition always false [test/compress/issue-1261.js:10,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:135,61]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:135,23]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:135,23]",
+        "WARN: Boolean || always true [test/compress/issue-1261.js:136,23]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:136,23]",
+        "WARN: Condition always true [test/compress/issue-1261.js:136,23]",
+        "WARN: Condition left of || always true [test/compress/issue-1261.js:137,8]",
+        "WARN: Condition always true [test/compress/issue-1261.js:137,8]",
+        "WARN: Boolean && always false [test/compress/issue-1261.js:138,23]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:138,23]",
+        "WARN: Condition always false [test/compress/issue-1261.js:138,23]",
+        "WARN: Condition left of && always false [test/compress/issue-1261.js:139,8]",
+        "WARN: Condition always false [test/compress/issue-1261.js:139,8]",
+        "WARN: + in boolean context always true [test/compress/issue-1261.js:140,23]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:140,23]",
+        "WARN: Condition always true [test/compress/issue-1261.js:140,23]",
+        "WARN: + in boolean context always true [test/compress/issue-1261.js:141,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:141,31]",
+        "WARN: Condition always true [test/compress/issue-1261.js:141,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:142,23]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:143,24]",
+        "WARN: Condition always true [test/compress/issue-1261.js:143,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:144,31]",
+        "WARN: Condition always false [test/compress/issue-1261.js:144,8]",
     ]
 }

test/compress/issue-1275.js

@@ -1,16 +1,16 @@
 string_plus_optimization: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        hoist_funs: true,
-        if_return: true,
-        join_vars: true,
-        side_effects: true,
-        unused: true,
-    }
+        side_effects  : true,
+        evaluate      : true,
+        conditionals  : true,
+        comparisons   : true,
+        dead_code     : true,
+        booleans      : true,
+        unused        : true,
+        if_return     : true,
+        join_vars     : true,
+        hoist_funs    : true,
+    };
     input: {
         function foo(anything) {
             function throwing_function() {

test/compress/issue-143.js

@@ -15,7 +15,7 @@
 tranformation_sort_order_equal: {
     options = {
         comparisons: true,
-    }
+    };
 
     input: { (a = parseInt('100')) == a }
     expect: { (a = parseInt('100')) == a }
@@ -24,7 +24,7 @@ tranformation_sort_order_equal: {
 tranformation_sort_order_unequal: {
     options = {
         comparisons: true,
-    }
+    };
 
     input: { (a = parseInt('100')) != a }
     expect: { (a = parseInt('100')) != a }
@@ -33,7 +33,7 @@ tranformation_sort_order_unequal: {
 tranformation_sort_order_lesser_or_equal: {
     options = {
         comparisons: true,
-    }
+    };
 
     input: { (a = parseInt('100')) <= a }
     expect: { (a = parseInt('100')) <= a }
@@ -41,7 +41,7 @@ tranformation_sort_order_lesser_or_equal: {
 tranformation_sort_order_greater_or_equal: {
     options = {
         comparisons: true,
-    }
+    };
 
     input: { (a = parseInt('100')) >= a }
     expect: { (a = parseInt('100')) >= a }

test/compress/issue-1431.js

@@ -1,6 +1,6 @@
 level_zero: {
     options = {
-        keep_fnames: true,
+        keep_fnames: true
     }
     mangle = {
         keep_fnames: true
@@ -29,7 +29,7 @@ level_zero: {
 
 level_one: {
     options = {
-        keep_fnames: true,
+        keep_fnames: true
     }
     mangle = {
         keep_fnames: true
@@ -58,7 +58,7 @@ level_one: {
 
 level_two: {
     options = {
-        keep_fnames: true,
+        keep_fnames: true
     }
     mangle = {
         keep_fnames: true
@@ -97,7 +97,7 @@ level_two: {
 
 level_three: {
     options = {
-        keep_fnames: true,
+        keep_fnames: true
     }
     mangle = {
         keep_fnames: true

test/compress/issue-1443.js

@@ -4,7 +4,7 @@ unsafe_undefined: {
     options = {
         conditionals: true,
         if_return: true,
-        unsafe_undefined: true,
+        unsafe: true
     }
     mangle = {}
     input: {
@@ -30,7 +30,7 @@ keep_fnames: {
     options = {
         conditionals: true,
         if_return: true,
-        unsafe_undefined: true,
+        unsafe: true
     }
     mangle = {
         keep_fnames: true

test/compress/issue-1447.js

@@ -22,17 +22,17 @@ else_with_empty_statement: {
 
 conditional_false_stray_else_in_loop: {
     options = {
-        booleans: true,
-        comparisons: true,
-        conditionals: false,
-        dead_code: true,
-        evaluate: true,
-        hoist_vars: true,
-        if_return: true,
-        join_vars: true,
-        loops: true,
-        side_effects: true,
-        unused: true,
+        evaluate     : true,
+        comparisons  : true,
+        booleans     : true,
+        unused       : true,
+        loops        : true,
+        side_effects : true,
+        dead_code    : true,
+        hoist_vars   : true,
+        join_vars    : true,
+        if_return    : true,
+        conditionals : false,
     }
     input: {
         for (var i = 1; i <= 4; ++i) {

test/compress/issue-1466.js

@@ -0,0 +1,284 @@
+same_variable_in_multiple_for_loop: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: true,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        side_effects: true,
+        collapse_vars: true,
+    }
+    mangle = {}
+    input: {
+        for (let i = 0; i < 3; i++) {
+            let a = 100;
+            console.log(i, a);
+            for (let i = 0; i < 2; i++) {
+                console.log(i, a);
+                let c = 2;
+                console.log(c);
+            }
+        }
+    }
+    expect: {
+        for (let o = 0; o < 3; o++) {
+            let l = 100;
+            console.log(o, l);
+            for (let o = 0; o < 2; o++) {
+                console.log(o, l);
+                let e = 2;
+                console.log(e);
+            }
+        }
+    }
+    expect_stdout: true
+}
+
+same_variable_in_multiple_forOf: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: true,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        side_effects: true,
+        collapse_vars: true,
+    }
+    mangle = {}
+    input: {
+        var test = [ "a", "b", "c" ];
+        for (let tmp of test) {
+            console.log(tmp);
+            let dd;
+            dd = [ "e", "f", "g" ];
+            for (let tmp of dd) {
+                console.log(tmp);
+            }
+        }
+    }
+    expect: {
+        var test = [ "a", "b", "c" ];
+        for (let o of test) {
+            console.log(o);
+            let e;
+            e = [ "e", "f", "g" ];
+            for (let o of e)
+                console.log(o);
+        }
+    }
+    expect_stdout: true
+}
+
+same_variable_in_multiple_forIn: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: false,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        side_effects: true,
+        collapse_vars: true,
+    }
+    mangle = {}
+    input: {
+        var test = [ "a", "b", "c" ];
+        for (let tmp in test) {
+            console.log(tmp);
+            let dd;
+            dd = [ "e", "f", "g" ];
+            for (let tmp in test) {
+                console.log(tmp);
+            }
+        }
+    }
+    expect: {
+        var test = [ "a", "b", "c" ];
+        for (let e in test) {
+            console.log(e);
+            let t;
+            t = [ "e", "f", "g" ];
+            for (let e in test)
+                console.log(e);
+        }
+    }
+    expect_stdout: true
+}
+
+different_variable_in_multiple_for_loop: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: true,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        side_effects: true,
+        collapse_vars: true,
+    }
+    mangle = {}
+    input: {
+        for (let i = 0; i < 3; i++) {
+            let a = 100;
+            console.log(i, a);
+            for (let j = 0; j < 2; j++) {
+                console.log(j, a);
+                let c = 2;
+                console.log(c);
+            }
+        }
+    }
+    expect: {
+        for (let o = 0; o < 3; o++) {
+            let l = 100;
+            console.log(o, l);
+            for (let o = 0; o < 2; o++) {
+                console.log(o, l);
+                let e = 2;
+                console.log(e);
+            }
+        }
+    }
+    expect_stdout: true
+}
+
+different_variable_in_multiple_forOf: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: true,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        side_effects: true,
+        collapse_vars: true,
+    }
+    mangle = {}
+    input: {
+        var test = [ "a", "b", "c" ];
+        for (let tmp of test) {
+            console.log(tmp);
+            let dd;
+            dd = [ "e", "f", "g" ];
+            for (let t of dd) {
+                console.log(t);
+            }
+        }
+    }
+    expect: {
+        var test = [ "a", "b", "c" ];
+        for (let o of test) {
+            console.log(o);
+            let e;
+            e = [ "e", "f", "g" ];
+            for (let o of e)
+                console.log(o);
+        }
+    }
+    expect_stdout: true
+}
+
+different_variable_in_multiple_forIn: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: false,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        side_effects: true,
+        collapse_vars: true,
+    }
+    mangle = {}
+    input: {
+        var test = [ "a", "b", "c" ];
+        for (let tmp in test) {
+            console.log(tmp);
+            let dd;
+            dd = [ "e", "f", "g" ];
+            for (let t in test) {
+                console.log(t);
+            }
+        }
+    }
+    expect: {
+        var test = [ "a", "b", "c" ];
+        for (let e in test) {
+            console.log(e);
+            let t;
+            t = [ "e", "f", "g" ];
+            for (let e in test)
+                console.log(e);
+        }
+    }
+    expect_stdout: true
+}
+
+more_variable_in_multiple_for: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: false,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        side_effects: true,
+        collapse_vars: true,
+    }
+    mangle = {}
+    input: {
+        for (let a = 9, i = 0; i < 20; i += a) {
+            let b = a++ + i;
+            console.log(a, b, i);
+            for (let k = b, m = b*b, i = 0; i < 10; i++) {
+                console.log(a, b, m, k, i);
+            }
+        }
+    }
+    expect: {
+        for (let o = 9, l = 0; l < 20; l += o) {
+            let e = o++ + l;
+            console.log(o, e, l);
+            for (let l = e, t = e * e, c = 0; c < 10; c++)
+                console.log(o, e, t, l, c);
+        }
+    }
+    expect_stdout: true
+}

test/compress/issue-1588.js

@@ -61,7 +61,7 @@ unsafe_undefined: {
     options = {
         conditionals: true,
         if_return: true,
-        unsafe_undefined: true,
+        unsafe: true,
     }
     mangle = {}
     input: {
@@ -85,3 +85,15 @@ unsafe_undefined: {
     }
     expect_stdout: true
 }
+
+runtime_error: {
+    input: {
+        const a = 1;
+        console.log(a++);
+    }
+    expect: {
+        const a = 1;
+        console.log(a++);
+    }
+    expect_stdout: true
+}

test/compress/issue-1609.js

@@ -52,30 +52,3 @@ chained_evaluation_2: {
         })();
     }
 }
-
-chained_evaluation_3: {
-    options = {
-        collapse_vars: true,
-        evaluate: 10,
-        reduce_funcs: true,
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        (function() {
-            var a = "long piece of string";
-            (function() {
-                var b = a, c;
-                c = f(b);
-                c.bar = b;
-            })();
-        })();
-    }
-    expect: {
-        (function() {
-            (function() {
-                f("long piece of string").bar = "long piece of string";
-            })();
-        })();
-    }
-}

test/compress/issue-1639.js

@@ -1,3 +1,4 @@
+
 issue_1639_1: {
     options = {
         booleans: true,
@@ -11,6 +12,7 @@ issue_1639_1: {
     }
     input: {
         var a = 100, b = 10;
+
         var L1 = 5;
         while (--L1 > 0) {
             if ((--b), false) {
@@ -19,15 +21,15 @@ issue_1639_1: {
                 }
             }
         }
+
         console.log(a, b);
     }
     expect: {
-        for (var a = 100, b = 10, L1 = 5, ignore; --L1 > 0;) {
-            --b;
-        }
+        for (var a = 100, b = 10, L1 = 5; --L1 > 0;)
+            if (--b, 0) var ignore = 0;
         console.log(a, b);
     }
-    expect_stdout: "100 6"
+    expect_stdout: true
 }
 
 issue_1639_2: {
@@ -42,23 +44,25 @@ issue_1639_2: {
     }
     input: {
         var a = 100, b = 10;
+
         function f19() {
             if (++a, false)
                 if (a)
                     if (++a);
         }
         f19();
+
         console.log(a, b);
     }
     expect: {
         var a = 100, b = 10;
         function f19() {
-            ++a, 1;
+            ++a, 0;
         }
         f19(),
         console.log(a, b);
     }
-    expect_stdout: "101 10"
+    expect_stdout: true
 }
 
 issue_1639_3: {
@@ -80,5 +84,5 @@ issue_1639_3: {
         a++,
         console.log(a, b);
     }
-    expect_stdout: "101 10"
+    expect_stdout: true
 }

test/compress/issue-1656.js

@@ -35,7 +35,11 @@ f7: {
         console.log(a, b);
     }
     expect_exact: [
-        "console.log(100, 100);",
+        "var b = 10;",
+        "",
+        "!function() {",
+        "    b = 100;",
+        "}(), console.log(100, b);",
     ]
-    expect_stdout: "100 100"
+    expect_stdout: true
 }

test/compress/issue-1704.js

@@ -104,7 +104,7 @@ mangle_catch_toplevel: {
         }
         console.log(a);
     }
-    expect_exact: 'var c="FAIL";try{throw 1}catch(o){c="PASS"}console.log(c);'
+    expect_exact: 'var o="FAIL";try{throw 1}catch(c){o="PASS"}console.log(o);'
     expect_stdout: "PASS"
 }
 
@@ -148,7 +148,7 @@ mangle_catch_var_toplevel: {
         }
         console.log(a);
     }
-    expect_exact: 'var r="FAIL";try{throw 1}catch(o){var r="PASS"}console.log(r);'
+    expect_exact: 'var o="FAIL";try{throw 1}catch(r){var o="PASS"}console.log(o);'
     expect_stdout: "PASS"
 }
 
@@ -345,95 +345,3 @@ mangle_catch_redef_2_ie8_toplevel: {
     expect_exact: 'try{throw"FAIL1"}catch(o){var o="FAIL2"}console.log(o);'
     expect_stdout: "undefined"
 }
-
-mangle_catch_redef_3: {
-    mangle = {
-        ie8: false,
-        toplevel: false,
-    }
-    input: {
-        var o = "PASS";
-        try {
-            throw 0;
-        } catch (o) {
-            (function() {
-                function f() {
-                    o = "FAIL";
-                }
-                f(), f();
-            })();
-        }
-        console.log(o);
-    }
-    expect_exact: 'var o="PASS";try{throw 0}catch(o){(function(){function c(){o="FAIL"}c(),c()})()}console.log(o);'
-    expect_stdout: true
-}
-
-mangle_catch_redef_3_toplevel: {
-    mangle = {
-        ie8: false,
-        toplevel: true,
-    }
-    input: {
-        var o = "PASS";
-        try {
-            throw 0;
-        } catch (o) {
-            (function() {
-                function f() {
-                    o = "FAIL";
-                }
-                f(), f();
-            })();
-        }
-        console.log(o);
-    }
-    expect_exact: 'var c="PASS";try{throw 0}catch(c){(function(){function o(){c="FAIL"}o(),o()})()}console.log(c);'
-    expect_stdout: true
-}
-
-mangle_catch_redef_3_ie8: {
-    mangle = {
-        ie8: true,
-        toplevel: false,
-    }
-    input: {
-        var o = "PASS";
-        try {
-            throw 0;
-        } catch (o) {
-            (function() {
-                function f() {
-                    o = "FAIL";
-                }
-                f(), f();
-            })();
-        }
-        console.log(o);
-    }
-    expect_exact: 'var o="PASS";try{throw 0}catch(o){(function(){function c(){o="FAIL"}c(),c()})()}console.log(o);'
-    expect_stdout: true
-}
-
-mangle_catch_redef_3_ie8_toplevel: {
-    mangle = {
-        ie8: true,
-        toplevel: true,
-    }
-    input: {
-        var o = "PASS";
-        try {
-            throw 0;
-        } catch (o) {
-            (function() {
-                function f() {
-                    o = "FAIL";
-                }
-                f(), f();
-            })();
-        }
-        console.log(o);
-    }
-    expect_exact: 'var c="PASS";try{throw 0}catch(c){(function(){function o(){c="FAIL"}o(),o()})()}console.log(c);'
-    expect_stdout: true
-}

test/compress/issue-1733.js

@@ -15,7 +15,7 @@ function_iife_catch: {
         }
         f();
     }
-    expect_exact: "function f(o){!function(){try{throw 0}catch(o){var c=1;console.log(o,c)}}()}f();"
+    expect_exact: "function f(o){!function(){try{throw 0}catch(c){var o=1;console.log(c,o)}}()}f();"
     expect_stdout: "0 1"
 }
 
@@ -36,7 +36,7 @@ function_iife_catch_ie8: {
         }
         f();
     }
-    expect_exact: "function f(c){!function(){try{throw 0}catch(c){var o=1;console.log(c,o)}}()}f();"
+    expect_exact: "function f(o){!function(){try{throw 0}catch(o){var c=1;console.log(o,c)}}()}f();"
     expect_stdout: "0 1"
 }
 
@@ -61,7 +61,7 @@ function_catch_catch: {
         }
         f();
     }
-    expect_exact: "var o=0;function f(){try{throw 1}catch(o){try{throw 2}catch(c){var c=3;console.log(c)}}console.log(c)}f();"
+    expect_exact: "var o=0;function f(){try{throw 1}catch(c){try{throw 2}catch(o){var o=3;console.log(o)}}console.log(o)}f();"
     expect_stdout: [
         "3",
         "undefined",

test/compress/issue-1770.js

@@ -46,7 +46,7 @@ mangle_props: {
             obj[1/0],
             obj["Infinity"],
             obj[-1/0],
-            obj[-(1/0)],
+            obj[-1/0],
             obj["-Infinity"],
             obj[null],
             obj["null"]
@@ -84,12 +84,12 @@ numeric_literal: {
         '    0: 0,',
         '    "-0": 1,',
         '    42: 2,',
-        '    42: 3,',
+        '    "42": 3,',
         '    37: 4,',
         '    o: 5,',
         '    1e42: 6,',
         '    b: 7,',
-        '    1e42: 8',
+        '    "1e+42": 8',
         '};',
         '',
         'console.log(obj[-0], obj[-""], obj["-0"]);',
@@ -107,139 +107,3 @@ numeric_literal: {
         "8 7 8",
     ]
 }
-
-identifier: {
-    mangle = {
-        properties: true,
-    }
-    input: {
-        var obj = {
-            abstract: 1,
-            boolean: 2,
-            byte: 3,
-            char: 4,
-            class: 5,
-            double: 6,
-            enum: 7,
-            export: 8,
-            extends: 9,
-            final: 10,
-            float: 11,
-            goto: 12,
-            implements: 13,
-            import: 14,
-            int: 15,
-            interface: 16,
-            let: 17,
-            long: 18,
-            native: 19,
-            package: 20,
-            private: 21,
-            protected: 22,
-            public: 23,
-            short: 24,
-            static: 25,
-            super: 26,
-            synchronized: 27,
-            this: 28,
-            throws: 29,
-            transient: 30,
-            volatile: 31,
-            yield: 32,
-            false: 33,
-            null: 34,
-            true: 35,
-            break: 36,
-            case: 37,
-            catch: 38,
-            const: 39,
-            continue: 40,
-            debugger: 41,
-            default: 42,
-            delete: 43,
-            do: 44,
-            else: 45,
-            finally: 46,
-            for: 47,
-            function: 48,
-            if: 49,
-            in: 50,
-            instanceof: 51,
-            new: 52,
-            return: 53,
-            switch: 54,
-            throw: 55,
-            try: 56,
-            typeof: 57,
-            var: 58,
-            void: 59,
-            while: 60,
-            with: 61,
-        };
-    }
-    expect: {
-        var obj = {
-            e: 1,
-            t: 2,
-            n: 3,
-            a: 4,
-            i: 5,
-            o: 6,
-            r: 7,
-            l: 8,
-            s: 9,
-            c: 10,
-            f: 11,
-            u: 12,
-            d: 13,
-            h: 14,
-            p: 15,
-            b: 16,
-            v: 17,
-            w: 18,
-            y: 19,
-            g: 20,
-            m: 21,
-            k: 22,
-            x: 23,
-            j: 24,
-            z: 25,
-            q: 26,
-            A: 27,
-            B: 28,
-            C: 29,
-            D: 30,
-            F: 31,
-            G: 32,
-            false: 33,
-            null: 34,
-            true: 35,
-            H: 36,
-            I: 37,
-            J: 38,
-            K: 39,
-            L: 40,
-            M: 41,
-            N: 42,
-            O: 43,
-            P: 44,
-            Q: 45,
-            R: 46,
-            S: 47,
-            T: 48,
-            U: 49,
-            V: 50,
-            W: 51,
-            X: 52,
-            Y: 53,
-            Z: 54,
-            $: 55,
-            _: 56,
-            ee: 57,
-            te: 58,
-            ne: 59,
-            ae: 60,
-            ie: 61,
-        };
-    }
-}

test/compress/issue-1833.js

@@ -125,8 +125,8 @@ label_do: {
 
 label_while: {
     options = {
-        dead_code: true,
         evaluate: true,
+        dead_code: true,
         loops: true,
     }
     input: {

test/compress/issue-2001.js

@@ -0,0 +1,283 @@
+export_func_1: {
+    options = {
+        hoist_funs: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        export function f(){};
+    }
+    expect_exact: "export function f(){};"
+}
+
+export_func_2: {
+    options = {
+        hoist_funs: true,
+        side_effects: false,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        export function f(){}(1);
+    }
+    expect_exact: "export function f(){};1;"
+}
+
+export_func_3: {
+    options = {
+        hoist_funs: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        export function f(){}(1);
+    }
+    expect_exact: "export function f(){};"
+}
+
+export_default_func_1: {
+    options = {
+        hoist_funs: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        export default function f(){};
+    }
+    expect_exact: "export default function f(){};"
+}
+
+export_default_func_2: {
+    options = {
+        hoist_funs: true,
+        side_effects: false,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        export default function f(){}(1);
+    }
+    expect_exact: "export default function f(){};1;"
+}
+
+export_default_func_3: {
+    options = {
+        hoist_funs: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        export default function f(){}(1);
+    }
+    expect_exact: "export default function f(){};"
+}
+
+export_class_1: {
+    options = {
+        hoist_funs: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        export class C {};
+    }
+    expect_exact: "export class C{};"
+}
+
+export_class_2: {
+    options = {
+        hoist_funs: true,
+        side_effects: false,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        export class C {}(1);
+    }
+    expect_exact: "export class C{};1;"
+}
+
+export_class_3: {
+    options = {
+        hoist_funs: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        export class C {}(1);
+    }
+    expect_exact: "export class C{};"
+}
+
+export_default_class_1: {
+    options = {
+        hoist_funs: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        export default class C {};
+    }
+    expect_exact: "export default class C{};"
+}
+
+export_default_class_2: {
+    options = {
+        hoist_funs: true,
+        side_effects: false,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        export default class C {}(1);
+    }
+    expect_exact: "export default class C{};1;"
+}
+
+export_default_class_3: {
+    options = {
+        hoist_funs: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        export default class C {}(1);
+    }
+    expect_exact: "export default class C{};"
+}
+
+export_mangle_1: {
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export function foo(one, two) {
+            return one - two;
+        };
+    }
+    expect_exact: "export function foo(o,n){return o-n};"
+}
+
+export_mangle_2: {
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export default function foo(one, two) {
+            return one - two;
+        };
+    }
+    expect_exact: "export default function foo(o,t){return o-t};"
+}
+
+export_mangle_3: {
+    options = {
+        collapse_vars: true,
+        unused: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export class C {
+            go(one, two) {
+                var z = one;
+                return one - two + z;
+            }
+        };
+    }
+    expect_exact: "export class C{go(r,e){return r-e+r}};"
+}
+
+export_mangle_4: {
+    options = {
+        collapse_vars: true,
+        unused: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export default class C {
+            go(one, two) {
+                var z = one;
+                return one - two + z;
+            }
+        };
+    }
+    expect_exact: "export default class C{go(e,r){return e-r+e}};"
+}
+
+export_mangle_5: {
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export default {
+            prop: function(one, two) {
+                return one - two;
+            }
+        };
+    }
+    expect_exact: "export default{prop:function(r,t){return r-t}};"
+}
+
+export_mangle_6: {
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        var baz = 2;
+        export let foo = 1, bar = baz;
+    }
+    expect_exact: "var o=2;export let foo=1,bar=o;"
+}
+
+export_toplevel_1: {
+    options = {
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        function f(){}
+        export function g(){};
+        export default function h(){};
+    }
+    expect: {
+        export function g(){};
+        export default function h(){};
+    }
+}
+
+export_toplevel_2: {
+    options = {
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        class A {}
+        export class B {};
+        export default class C {};
+    }
+    expect: {
+        export class B {};
+        export default class C {};
+    }
+}
+
+export_default_func_ref: {
+    options = {
+        hoist_funs: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        export default function f(){};
+        f();
+    }
+    expect_exact: "export default function f(){};f();"
+}

test/compress/issue-203.js

@@ -0,0 +1,57 @@
+
+compress_new_function: {
+    options = {
+        unsafe: true,
+        unsafe_Func: true,
+    }
+    input: {
+        new Function("aa, bb", 'return aa;');
+    }
+    expect: {
+        Function("n,r", "return n");
+    }
+}
+
+compress_new_function_with_destruct: {
+    options = {
+        unsafe: true,
+        unsafe_Func: true,
+        ecma: 6
+    }
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        new Function("aa, [bb]", 'return aa;');
+        new Function("aa, {bb}", 'return aa;');
+        new Function("[[aa]], [{bb}]", 'return aa;');
+    }
+    expect: {
+        Function("n,[r]", "return n");
+        Function("n,{bb:b}", "return n");
+        Function("[[n]],[{bb:b}]", "return n");
+    }
+}
+
+compress_new_function_with_destruct_arrows: {
+    options = {
+        arrows: true,
+        unsafe_arrows: true,
+        unsafe: true,
+        unsafe_Func: true,
+        ecma: 6,
+    }
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        new Function("aa, [bb]", 'return aa;');
+        new Function("aa, {bb}", 'return aa;');
+        new Function("[[aa]], [{bb}]", 'return aa;');
+    }
+    expect: {
+        Function("n,[a]", "return n");
+        Function("b,{bb:n}", "return b");
+        Function("[[b]],[{bb:n}]", "return b");
+    }
+}

test/compress/issue-208.js

@@ -1,8 +1,6 @@
 do_not_update_lhs: {
     options = {
-        global_defs: {
-            DEBUG: 0,
-        },
+        global_defs: { DEBUG: 0 }
     }
     input: {
         DEBUG++;
@@ -18,9 +16,7 @@ do_not_update_lhs: {
 
 do_update_rhs: {
     options = {
-        global_defs: {
-            DEBUG: 0,
-        },
+        global_defs: { DEBUG: 0 }
     }
     input: {
         MY_DEBUG = DEBUG;
@@ -39,10 +35,10 @@ mixed: {
             DEBUG: 0,
             ENV: 1,
             FOO: 2,
-        },
+        }
     }
     input: {
-        var ENV = 3;
+        const ENV = 3;
         var FOO = 4;
         f(ENV * 10);
         --FOO;
@@ -53,7 +49,7 @@ mixed: {
         x = DEBUG;
     }
     expect: {
-        var ENV = 3;
+        const ENV = 3;
         var FOO = 4;
         f(10);
         --FOO;
@@ -64,11 +60,11 @@ mixed: {
         x = 0;
     }
     expect_warnings: [
-        "WARN: global_defs ENV redefined [test/compress/issue-208.js:1,12]",
-        "WARN: global_defs FOO redefined [test/compress/issue-208.js:2,12]",
-        "WARN: global_defs FOO redefined [test/compress/issue-208.js:4,10]",
-        "WARN: global_defs DEBUG redefined [test/compress/issue-208.js:5,8]",
-        "WARN: global_defs DEBUG redefined [test/compress/issue-208.js:6,8]",
-        "WARN: global_defs DEBUG redefined [test/compress/issue-208.js:7,8]",
+        'WARN: global_defs ENV redefined [test/compress/issue-208.js:41,14]',
+        'WARN: global_defs FOO redefined [test/compress/issue-208.js:42,12]',
+        'WARN: global_defs FOO redefined [test/compress/issue-208.js:44,10]',
+        'WARN: global_defs DEBUG redefined [test/compress/issue-208.js:45,8]',
+        'WARN: global_defs DEBUG redefined [test/compress/issue-208.js:46,8]',
+        'WARN: global_defs DEBUG redefined [test/compress/issue-208.js:47,8]',
     ]
 }

test/compress/issue-22.js

@@ -1,7 +1,5 @@
 return_with_no_value_in_if_body: {
-    options = {
-        conditionals: true,
-    }
+    options = { conditionals: true };
     input: {
         function foo(bar) {
             if (bar) {

test/compress/issue-267.js

@@ -1,7 +1,5 @@
 issue_267: {
-    options = {
-        comparisons: true,
-    }
+    options = { comparisons: true };
     input: {
         x = a % b / b * c * 2;
         x = a % b * 2

test/compress/issue-269.js

@@ -1,111 +1,66 @@
 issue_269_1: {
-    options = {
-        unsafe: true,
-    }
-    input: {
-        var x = {};
-        console.log(
-            String(x),
-            Number(x),
-            Boolean(x),
+	options = {unsafe: true};
+	input: {
+		f(
+			String(x),
+			Number(x),
+			Boolean(x),
 
-            String(),
-            Number(),
-            Boolean()
-        );
-    }
-    expect: {
-        var x = {};
-        console.log(
-            x + "", +x, !!x,
-            "", 0, false
-        );
-    }
-    expect_stdout: true
+			String(),
+			Number(),
+			Boolean()
+		);
+	}
+	expect: {
+		f(
+			x + '', +x, !!x,
+			'', 0, false
+		);
+	}
 }
 
 issue_269_dangers: {
-    options = {
-        unsafe: true,
-    }
-    input: {
-        var x = {};
-        console.log(
-            String(x, x),
-            Number(x, x),
-            Boolean(x, x)
-        );
-    }
-    expect: {
-        var x = {};
-        console.log(String(x, x), Number(x, x), Boolean(x, x));
-    }
-    expect_stdout: true
+	options = {unsafe: true};
+	input: {
+		f(
+			String(x, x),
+			Number(x, x),
+			Boolean(x, x)
+		);
+	}
+	expect: {
+		f(String(x, x), Number(x, x), Boolean(x, x));
+	}
 }
 
 issue_269_in_scope: {
-    options = {
-        unsafe: true,
-    }
-    input: {
-        var String, Number, Boolean;
-        var x = {};
-        console.log(
-            String(x),
-            Number(x, x),
-            Boolean(x)
-        );
-    }
-    expect: {
-        var String, Number, Boolean;
-        var x = {};
-        console.log(String(x), Number(x, x), Boolean(x));
-    }
-    expect_stdout: true
+	options = {unsafe: true};
+	input: {
+		var String, Number, Boolean;
+		f(
+			String(x),
+			Number(x, x),
+			Boolean(x)
+		);
+	}
+	expect: {
+		var String, Number, Boolean;
+		f(String(x), Number(x, x), Boolean(x));
+	}
 }
 
 strings_concat: {
-    options = {
-        strings: true,
-        unsafe: true,
-    }
-    input: {
-        var x = {};
-        console.log(
-            String(x + "str"),
-            String("str" + x)
-        );
-    }
-    expect: {
-        var x = {};
-        console.log(
-            x + "str",
-            "str" + x
-        );
-    }
-    expect_stdout: true
-}
-
-regexp: {
-    options = {
-        evaluate: true,
-        unsafe: true,
-    }
-    input: {
-        RegExp("foo");
-        RegExp("bar", "ig");
-        RegExp(foo);
-        RegExp("bar", ig);
-        RegExp("should", "fail");
-    }
-    expect: {
-        /foo/;
-        /bar/ig;
-        RegExp(foo);
-        RegExp("bar", ig);
-        RegExp("should", "fail");
-    }
-    expect_warnings: [
-        'WARN: Error converting RegExp("should","fail") [test/compress/issue-269.js:5,8]',
-    ]
+	options = {unsafe: true};
+	input: {
+		f(
+			String(x + 'str'),
+			String('str' + x)
+		);
+	}
+	expect: {
+		f(
+			x + 'str',
+			'str' + x
+		);
+	}
 }

test/compress/issue-2719.js

@@ -1,32 +0,0 @@
-warn: {
-    options = {
-        evaluate: true,
-        inline: true,
-        passes: 2,
-        properties: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        function f() {
-            return g();
-        }
-        function g() {
-            return g["call" + "er"].arguments;
-        }
-        // 3
-        console.log(f(1, 2, 3).length);
-    }
-    expect: {
-        // TypeError: Cannot read property 'arguments' of null
-        console.log(function g() {
-            return g.caller.arguments;
-        }().length);
-    }
-    expect_warnings: [
-        "WARN: Function.prototype.arguments not supported [test/compress/issue-2719.js:5,19]",
-        "WARN: Function.prototype.caller not supported [test/compress/issue-2719.js:5,19]",
-    ]
-}

test/compress/issue-281.js

@@ -186,7 +186,7 @@ negate_iife_5_off: {
         inline: true,
         negate_iife: false,
         sequences: true,
-    }
+    };
     input: {
         if ((function(){ return t })()) {
             foo(true);
@@ -245,7 +245,7 @@ negate_iife_issue_1073: {
         reduce_vars: true,
         sequences: true,
         unused: true,
-    }
+    };
     input: {
         new (function(a) {
             return function Foo() {
@@ -273,7 +273,7 @@ issue_1288_side_effects: {
         reduce_vars: true,
         side_effects: true,
         unused: true,
-    }
+    };
     input: {
         if (w) ;
         else {
@@ -399,7 +399,7 @@ wrap_iife_in_expression: {
         wrap_iife: true,
     }
     input: {
-        foo = (function() {
+        foo = (function () {
             return bar();
         })();
     }

test/compress/issue-2871.js

@@ -1,37 +0,0 @@
-comparison_with_undefined: {
-    options = {
-        comparisons: true,
-    }
-    input: {
-        a == undefined;
-        a != undefined;
-        a === undefined;
-        a !== undefined;
-
-        undefined == a;
-        undefined != a;
-        undefined === a;
-        undefined !== a;
-
-        void 0 == a;
-        void 0 != a;
-        void 0 === a;
-        void 0 !== a;
-    }
-    expect: {
-        null == a;
-        null != a;
-        void 0 === a;
-        void 0 !== a;
-
-        null == a;
-        null != a;
-        void 0 === a;
-        void 0 !== a;
-
-        null == a;
-        null != a;
-        void 0 === a;
-        void 0 !== a;
-    }
-}

test/compress/issue-2989.js

@@ -1,21 +0,0 @@
-inline_script_off: {
-    beautify = {
-        inline_script: false,
-    }
-    input: {
-        console.log("</sCrIpT>");
-    }
-    expect_exact: 'console.log("</sCrIpT>");'
-    expect_stdout: "</sCrIpT>"
-}
-
-inline_script_on: {
-    beautify = {
-        inline_script: true,
-    }
-    input: {
-        console.log("</sCrIpT>");
-    }
-    expect_exact: 'console.log("<\\/sCrIpT>");'
-    expect_stdout: "</sCrIpT>"
-}

test/compress/issue-3768.js

@@ -1,128 +0,0 @@
-mangle: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        var e = eval, x = 42;
-        (function() {
-            console.log(e("typeof x"));
-        })();
-    }
-    expect: {
-        var e = eval, x = 42;
-        (function() {
-            console.log(e("typeof x"));
-        })();
-    }
-    expect_stdout: true
-}
-
-compress: {
-    options = {
-        collapse_vars: true,
-        inline: true,
-        unused: true,
-    }
-    input: {
-        console.log(function() {
-            var a = 42;
-            return eval("typeof a");
-        }(), function(e) {
-            var a = null;
-            return e("typeof a");
-        }(eval), function(eval) {
-            var a = false;
-            return eval("typeof a");
-        }(eval), function(f) {
-            var a = "STRING";
-            var eval = f;
-            return eval("typeof a");
-        }(eval), function(g) {
-            var a = eval;
-            function eval() {
-                return g;
-            }
-            return eval()("typeof a");
-        }(eval));
-    }
-    expect: {
-        console.log(function() {
-            var a = 42;
-            return eval("typeof a");
-        }(), (0, eval)("typeof a"), function(eval) {
-            var a = false;
-            return eval("typeof a");
-        }(eval), function(f) {
-            var a = "STRING";
-            var eval = f;
-            return eval("typeof a");
-        }(eval), function(g) {
-            var a = eval;
-            function eval() {
-                return g;
-            }
-            return eval()("typeof a");
-        }(eval));
-    }
-    expect_stdout: "number undefined boolean string undefined"
-}
-
-call_arg_1: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        var z = "foo";
-        (function() {
-            var z = false;
-            (function(e) {
-                var z = 42;
-                e("console.log(typeof z)");
-            })(eval);
-        })();
-    }
-    expect: {
-        var z = "foo";
-        (function() {
-            var o = false;
-            (function(o) {
-                var a = 42;
-                o("console.log(typeof z)");
-            })(eval);
-        })();
-    }
-    expect_stdout: true
-}
-
-call_arg_2: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        function eval() {
-            console.log("PASS");
-        }
-        var z = "foo";
-        (function() {
-            var z = false;
-            (function(e) {
-                var z = 42;
-                e("console.log(typeof z)");
-            })(eval);
-        })();
-    }
-    expect: {
-        function n() {
-            console.log("PASS");
-        }
-        var o = "foo";
-        (function() {
-            var o = false;
-            (function(o) {
-                var n = 42;
-                o("console.log(typeof z)");
-            })(n);
-        })();
-    }
-    expect_stdout: "PASS"
-}

test/compress/issue-44.js

@@ -1,7 +1,5 @@
 issue_44_valid_ast_1: {
-    options = {
-        unused: true,
-    }
+    options = { unused: true };
     input: {
         function a(b) {
             for (var i = 0, e = b.qoo(); ; i++) {}
@@ -16,9 +14,7 @@ issue_44_valid_ast_1: {
 }
 
 issue_44_valid_ast_2: {
-    options = {
-        unused: true,
-    }
+    options = { unused: true };
     input: {
         function a(b) {
             if (foo) for (var i = 0, e = b.qoo(); ; i++) {}

test/compress/issue-59.js

@@ -1,8 +1,8 @@
 keep_continue: {
     options = {
         dead_code: true,
-        evaluate: true,
-    }
+        evaluate: true
+    };
     input: {
         while (a) {
             if (b) {

test/compress/issue-597.js

@@ -1,5 +1,5 @@
 NaN_and_Infinity_must_have_parens: {
-    options = {}
+    options = {};
     input: {
         Infinity.toString();
         NaN.toString();
@@ -11,7 +11,7 @@ NaN_and_Infinity_must_have_parens: {
 }
 
 NaN_and_Infinity_should_not_be_replaced_when_they_are_redefined: {
-    options = {}
+    options = {};
     input: {
         var Infinity, NaN;
         Infinity.toString();

test/compress/issue-611.js

@@ -1,8 +1,8 @@
 issue_611: {
   options = {
-        sequences: true,
-        side_effects: true,
-    }
+    sequences: true,
+    side_effects: true
+  };
   input: {
     define(function() {
       function fn() {}

test/compress/issue-637.js

@@ -1,9 +1,9 @@
 wrongly_optimized: {
     options = {
-        booleans: true,
         conditionals: true,
-        evaluate: true,
-    }
+        booleans: true,
+        evaluate: true
+    };
     input: {
         function func() {
             foo();
@@ -16,6 +16,7 @@ wrongly_optimized: {
         function func() {
             foo();
         }
-        func(), 1, bar();
+        // TODO: optimize to `func(), bar()`
+        (func(), 1) && bar();
     }
 }

test/compress/issue-640.js

@@ -21,19 +21,19 @@ cond_5: {
         }
     }
     expect: {
-        (some_condition() && some_other_condition() ? do_something : alternate)();
+        some_condition() && some_other_condition() ? do_something() : alternate();
         if (some_condition() && some_other_condition()) do_something();
     }
 }
 
 dead_code_const_annotation_regex: {
     options = {
-        booleans: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        expression: true,
-        loops: true,
+        booleans     : true,
+        conditionals : true,
+        dead_code    : true,
+        evaluate     : true,
+        expression   : true,
+        loops        : true,
     }
     input: {
         var unused;
@@ -82,9 +82,8 @@ drop_value: {
 
 wrongly_optimized: {
     options = {
-        booleans: true,
         conditionals: true,
-        dead_code: true,
+        booleans: true,
         evaluate: true,
         expression: true,
     }
@@ -100,8 +99,8 @@ wrongly_optimized: {
         function func() {
             foo();
         }
-        func(), 1;
-        bar();
+        // TODO: optimize to `func(), bar()`
+        if (func(), 1) bar();
     }
 }
 
@@ -196,7 +195,7 @@ negate_iife_5_off: {
         expression: true,
         negate_iife: false,
         sequences: true,
-    }
+    };
     input: {
         if ((function(){ return t })()) {
             foo(true);
@@ -249,9 +248,7 @@ issue_1254_negate_iife_nested: {
 conditional: {
     options = {
         expression: true,
-        pure_funcs: [
-            "pure"
-        ],
+        pure_funcs: [ "pure" ],
         side_effects: true,
     }
     input: {

test/compress/issue-751.js

@@ -1,7 +1,7 @@
 negate_booleans_1: {
     options = {
-        comparisons: true,
-    }
+        comparisons: true
+    };
     input: {
         var a = !a || !b || !c || !d || !e || !f;
     }
@@ -12,8 +12,8 @@ negate_booleans_1: {
 
 negate_booleans_2: {
     options = {
-        comparisons: true,
-    }
+        comparisons: true
+    };
     input: {
         var match = !x &&       // should not touch this one
             (!z || c) &&

test/compress/issue-782.js

@@ -1,31 +1,11 @@
-remove_sequence: {
-    options = {
-        side_effects: true,
-    }
-    input: {
-        (0, 1, eval)();
-        (0, 1, logThis)();
-        (0, 1, _decorators.logThis)();
-    }
-    expect: {
-        (0, eval)();
-        logThis();
-        (0, _decorators.logThis)();
-    }
-}
-
 remove_redundant_sequence_items: {
-    options = {
-        side_effects: true,
-    }
+    options = { side_effects: true };
     input: {
-        "use strict";
         (0, 1, eval)();
         (0, 1, logThis)();
         (0, 1, _decorators.logThis)();
     }
     expect: {
-        "use strict";
         (0, eval)();
         logThis();
         (0, _decorators.logThis)();
@@ -33,17 +13,13 @@ remove_redundant_sequence_items: {
 }
 
 dont_remove_this_binding_sequence: {
-    options = {
-        side_effects: true,
-    }
+    options = { side_effects: true };
     input: {
-        "use strict";
         (0, eval)();
         (0, logThis)();
         (0, _decorators.logThis)();
     }
     expect: {
-        "use strict";
         (0, eval)();
         logThis();
         (0, _decorators.logThis)();