harmony-v3.1.3

fixes #2316

.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**
@@ -11,8 +15,6 @@
     UglifyJS alone - without third party tools or libraries.
     Ideally the input should be as small as possible.
     Post a link to a gist if necessary.
-
-    Issues without a reproducible test case will be closed.
 -->
 
 **The `uglifyjs` CLI command executed or `minify()` options used.**
@@ -20,6 +22,6 @@
 **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

@@ -1,44 +0,0 @@
-name: Fuzzing
-on:
-  pull_request:
-  schedule:
-    - cron: "*/5 * * * *"
-env:
-  BASE_URL: https://api.github.com/repos/${{ github.repository }}
-  CAUSE: ${{ github.event_name }}
-  RUN_NUM: ${{ github.run_number }}
-  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
-          if [[ $CAUSE == "schedule" ]]; then
-            node test/ufuzz/job $BASE_URL $TOKEN $RUN_NUM
-          else
-            node test/ufuzz/job 5000
-          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

@@ -1,15 +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` supports ECMAScript 5 and some newer language features.
-- To minify ECMAScript 2015 or above, you may need to 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
 -------
@@ -19,11 +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
 
@@ -71,7 +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:
@@ -89,7 +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.
@@ -107,8 +102,7 @@ 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>            Specifiy 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.
@@ -123,12 +117,10 @@ 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
@@ -137,10 +129,6 @@ a double dash to prevent input files being used as option arguments:
     --toplevel                  Compress and/or mangle variables in top level scope.
     --verbose                   Print diagnostic messages.
     --warn                      Print warning messages.
-    --webkit                    Support non-standard Safari/Webkit.
-                                Equivalent to setting `webkit: true` in `minify()`
-                                for `mangle` and `output` options.
-                                By default UglifyJS will not try to be Safari-proof.
     --wrap <name>               Embed everything in a big function, making the
                                 “exports” and “global” variables available. You
                                 need to pass an argument to this option to
@@ -160,19 +148,14 @@ 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.
 
+- `--source-map "url='<URL>'"` to specify the URL where the source map can be found.
+
 For example:
 
     uglifyjs js/file1.js js/file2.js \
@@ -218,16 +201,19 @@ 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` — mangle names declared in the top level scope (disabled by
+  default).
 
-- `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` — mangle names visible in scopes where `eval` or `with` are used
+  (disabled by default).
 
-      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`)
 
@@ -235,7 +221,7 @@ To enable the mangler you need to pass `--mangle` (`-m`).  The following
 is a separate step, different from variable name mangling.  Pass
 `--mangle-props` to enable it.  It will mangle all properties in the
 input code with the exception of built in DOM properties and properties
-in core JavaScript classes.  For example:
+in core javascript classes.  For example:
 
 ```javascript
 // example.js
@@ -250,7 +236,7 @@ x.bar_ = 2;
 x["baz_"] = 3;
 console.log(x.calc());
 ```
-Mangle all properties (except for JavaScript `builtins`):
+Mangle all properties (except for javascript `builtins`):
 ```bash
 $ uglifyjs example.js -c -m --mangle-props
 ```
@@ -359,7 +345,7 @@ 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)`**,
@@ -488,45 +474,42 @@ 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.
-
-- `parse` (default `{}`) — pass an object if you wish to specify some
-  additional [parse options](#parse-options).
-
-- `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.
-
-- `warnings` (default `false`) — pass `true` to return compressor warnings
-  in `result.warnings`. Use the value `"verbose"` for more detailed warnings.
-
-- `webkit` (default `false`) -- enable workarounds for Safari/WebKit bugs.
-  PhantomJS users should set this option to `true`.
+- `ie8` (default `false`) - set to `true` to support IE8.
 
 ## Minify options structure
 
@@ -551,6 +534,7 @@ if (result.error) throw result.error;
     sourceMap: {
         // source map options
     },
+    ecma: 5, // specify one of: 5, 6, 7 or 8
     nameCache: null, // or specify a name cache object
     toplevel: false,
     ie8: false,
@@ -605,141 +589,18 @@ 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.
-
-- `booleans` (default: `true`) -- various optimizations for boolean context,
-  for example `!!a ? b : c → a ? b : c`
-
-- `collapse_vars` (default: `true`) -- Collapse single-use non-constant variables,
-  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.
-
-- `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
-  after dropping the function call then use `pure_funcs` instead.
-
-- `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.
-
-- `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
-
-- `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.
-
-- `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`
-
-- `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_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).
-
-- `keep_infinity` (default: `false`) -- Pass `true` to prevent `Infinity` from
-  being compressed into `1/0`, which may cause performance issues on Chrome.
-
-- `loops` (default: `true`) -- optimizations for `do`, `while` and `for` loops
-  when we can statically determine the condition.
-
-- `merge_vars` (default: `true`) -- combine and reuse variables.
-
-- `negate_iife` (default: `true`) -- negate "Immediately-Called Function Expressions"
-  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.
-
-- `properties` (default: `true`) -- rewrite property access using the dot notation, for
-  example `foo["bar"] → foo.bar`
-
-- `pure_funcs` (default: `null`) -- You can pass an array of names and
-  UglifyJS will assume that those functions do not produce side
-  effects.  DANGER: will not check if the name is redefined in scope.
-  An example case here, for instance `var q = Math.floor(a/b)`.  If
-  variable `q` is not used elsewhere, UglifyJS will drop it, but will
-  still keep the `Math.floor(a/b)`, not knowing what it does.  You can
-  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.
-
-- `pure_getters` (default: `"strict"`) -- If you pass `true` for
-  this, UglifyJS will assume that object property access
-  (e.g. `foo.bar` or `foo["bar"]`) doesn't have any side effects.
-  Specify `"strict"` to treat `foo.bar` as side-effect-free only when
-  `foo` is certain to not throw, i.e. not `null` or `undefined`.
-
-- `reduce_funcs` (default: `true`) -- Allows single-use functions to be
-  inlined as function expressions when permissible allowing further
-  optimization.  Enabled by default.  Option depends on `reduce_vars`
-  being enabled.  Some code runs faster in the Chrome V8 engine if this
-  option is disabled.  Does not negatively impact other major browsers.
-
-- `reduce_vars` (default: `true`) -- Improve optimization on variables assigned with and
-  used as constant values.
-
-- `sequences` (default: `true`) -- join consecutive simple statements using the
+- `sequences` (default: true) -- join consecutive simple statements using the
   comma operator.  May be set to a positive integer to specify the maximum number
   of consecutive comma sequences that will be generated. If this option is set to
   `true` then the default `sequences` limit is `200`. Set option to `false` or `0`
@@ -748,70 +609,176 @@ to be `false` and all symbol names will be omitted.
   occasions the default sequences limit leads to very slow compress times in which
   case a value of `20` or less is recommended.
 
-- `side_effects` (default: `true`) -- Pass `false` to disable potentially dropping
+- `properties` -- rewrite property access using the dot notation, for
+  example `foo["bar"] → foo.bar`
+
+- `dead_code` -- remove unreachable code
+
+- `drop_debugger` -- remove `debugger;` statements
+
+- `unsafe` (default: false) -- apply "unsafe" transformations (discussion below)
+
+- `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.
+
+- `conditionals` -- apply optimizations for `if`-s and conditional
+  expressions
+
+- `comparisons` -- apply certain optimizations to binary nodes, for example:
+  `!(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.
+
+- `evaluate` -- attempt to evaluate constant 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.
+
+- `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.
+
+- `booleans` -- various optimizations for boolean context, for example `!!a
+  ? b : c → a ? b : c`
+
+- `typeofs` -- default `true`.  Transforms `typeof foo == "undefined"` into
+  `foo === void 0`.  Note: recommend to set this value to `false` for IE10 and
+  earlier versions due to known issues.
+
+- `loops` -- optimizations for `do`, `while` and `for` loops when we can
+  statically determine the condition
+
+- `unused` -- drop unreferenced functions and variables (simple direct variable
+  assignments do not count as references unless set to `"keep_assign"`)
+
+- `toplevel` -- drop unreferenced functions (`"funcs"`) and/or variables (`"vars"`)
+  in the top level scope (`false` by default, `true` to drop both unreferenced
+  functions and variables)
+
+- `top_retain` -- prevent specific toplevel functions and variables from `unused`
+  removal (can be array, comma-separated, RegExp or function. Implies `toplevel`)
+
+- `hoist_funs` -- hoist function declarations
+
+- `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` -- optimizations for if/return and if/continue
+
+- `inline` -- embed simple functions
+
+- `join_vars` -- join consecutive `var` statements
+
+- `cascade` -- small optimization for sequences, transform `x, x` into `x`
+  and `x = something(), x` into `x = something()`
+
+- `collapse_vars` -- Collapse single-use non-constant variables - side
+  effects permitting.
+
+- `reduce_vars` -- Improve optimization on variables assigned with and
+  used as constant values.
+
+- `warnings` -- display warnings when dropping unreachable code or unused
+  declarations etc.
+
+- `negate_iife` -- negate "Immediately-Called Function Expressions"
+  where the return value is discarded, to avoid the parens that the
+  code generator would insert.
+
+- `pure_getters` -- the default is `false`.  If you pass `true` for
+  this, UglifyJS will assume that object property access
+  (e.g. `foo.bar` or `foo["bar"]`) doesn't have any side effects.
+  Specify `"strict"` to treat `foo.bar` as side-effect-free only when
+  `foo` is certain to not throw, i.e. not `null` or `undefined`.
+
+- `pure_funcs` -- default `null`.  You can pass an array of names and
+  UglifyJS will assume that those functions do not produce side
+  effects.  DANGER: will not check if the name is redefined in scope.
+  An example case here, for instance `var q = Math.floor(a/b)`.  If
+  variable `q` is not used elsewhere, UglifyJS will drop it, but will
+  still keep the `Math.floor(a/b)`, not knowing what it does.  You can
+  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).
+
+- `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
+  after dropping the function call then use `pure_funcs` instead.
+
+- `expression` -- default `false`.  Pass `true` to preserve completion values
+  from terminal statements without `return`, e.g. in bookmarklets.
+
+- `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).
+
+- `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.
+
+- `keep_infinity` -- default `false`. Pass `true` to prevent `Infinity` from
+  being compressed into `1/0`, which may cause performance issues on Chrome.
+
+- `side_effects` -- default `true`. Pass `false` to disable potentially dropping
   functions marked as "pure".  A function call is marked as "pure" if a comment
   annotation `/*@__PURE__*/` or `/*#__PURE__*/` immediately precedes the call. For
   example: `/*@__PURE__*/foo();`
 
-- `spread` (default: `true`) -- flatten spread expressions.
-
-- `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
-  variables (`"vars"`) in the top level scope (`false` by default, `true` to drop
-  both unreferenced functions and variables)
-
-- `top_retain` (default: `null`) -- prevent specific toplevel functions and
-  variables from `unused` removal (can be array, comma-separated, RegExp or
-  function. Implies `toplevel`)
-
-- `typeofs` (default: `true`) -- Transforms `typeof foo == "undefined"` into
-  `foo === void 0`.  Note: recommend to set this value to `false` for IE10 and
-  earlier versions due to known issues.
-
-- `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_Function` (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_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"`)
-
-- `varify` (default: `true`) -- convert block-scoped declaractions into `var`
-  whenever safe to do so
+- `ecma` -- default `5`. Pass `6` or greater to enable `compress` options that
+  will transform ES5 code into smaller ES6+ equivalent forms.
 
 ## Mangle options
 
-- `eval` (default `false`) -- Pass `true` to mangle names visible in scopes
-  where `eval` or `with` are used.
+- `reserved` (default `[]`). Pass an array of identifiers that should be
+  excluded from mangling. Example: `["foo", "bar"]`.
 
-- `keep_fnames` (default `false`) -- Pass `true` to not mangle function names.
+- `toplevel` (default `false`). Pass `true` to mangle names declared in the
+  top level scope.
+
+- `keep_classnames` (default `false`).  Pass `true` to not mangle class names.
+
+- `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).
 
-- `reserved` (default `[]`) -- Pass an array of identifiers that should be
-  excluded from mangling. Example: `["foo", "bar"]`.
+- `eval` (default `false`). Pass `true` to mangle names visible in scopes
+  where `eval` or `with` are used.
 
-- `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".
 
 Examples:
 
@@ -837,19 +804,15 @@ UglifyJS.minify(code, { mangle: { toplevel: true } }).code;
 
 ### Mangle properties options
 
-- `builtins` (default: `false`) -- Use `true` to allow the mangling of builtin
-  DOM properties. Not recommended to override this setting.
-
-- `debug` (default: `false`) -— Mangle names with the original name still present.
-  Pass an empty string `""` to enable, or a non-empty string to set the debug suffix.
-
-- `keep_quoted` (default: `false`) -— Only mangle unquoted property names.
-
-- `regex` (default: `null`) -— Pass a RegExp literal to only mangle property
-  names matching the regular expression.
-
 - `reserved` (default: `[]`) -- Do not mangle property names listed in the
   `reserved` array.
+- `regex` (default: `null`) -— Pass a RegExp literal to only mangle property
+  names matching the regular expression.
+- `keep_quoted` (default: `false`) -— Only mangle unquoted property names.
+- `debug` (default: `false`) -— Mangle names with the original name still present.
+  Pass an empty string `""` to enable, or a non-empty string to set the debug suffix.
+- `builtins` (default: `false`) -- Use `true` to allow the mangling of builtin
+  DOM properties. Not recommended to override this setting.
 
 ## Output options
 
@@ -859,51 +822,37 @@ can pass additional arguments that control the code output:
 
 - `ascii_only` (default `false`) -- escape Unicode characters in strings and
   regexps (affects directives with non-ascii characters becoming invalid)
-
 - `beautify` (default `true`) -- whether to actually beautify the output.
   Passing `-b` will set this to true, but you might need to pass `-b` even
   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;
-  }
-  ```
-
-- `galio` (default `false`) -- enable workarounds for ANT Galio bugs
-
-- `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
-
+  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 `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.
-
 - `max_line_len` (default `false`) -- maximum line length (for uglified code)
-
 - `preamble` (default `null`) -- when passed it must be a string and
   it will be prepended to the output literally.  The source map will
   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
-
 - `quote_style` (default `0`) -- preferred quote style for strings (affects
   quoted property names and directives as well):
   - `0` -- prefers double quotes, switches to single quotes when there are
@@ -911,25 +860,19 @@ can pass additional arguments that control the code output:
   - `1` -- always use single quotes
   - `2` -- always use double quotes
   - `3` -- always use the original quotes
-
 - `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
   gzip could be smaller; size after gzip insignificantly larger).
-
 - `shebang` (default `true`) -- preserve shebang `#!` in preamble (bash scripts)
-
-- `v8` (default `false`) -- enable workarounds for Chrome & Node.js bugs
-
-- `width` (default `80`) -- only takes effect when beautification is on, this
+- `width` (default 80) -- only takes effect when beautification is on, this
   specifies an (orientative) line width that the beautifier will try to
   obey.  It refers to the width of the line text (excluding indentation).
   It doesn't work very well currently, but it does make the code generated
   by UglifyJS more readable.
-
 - `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
 
@@ -972,6 +915,9 @@ 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
 
@@ -1088,9 +1034,8 @@ 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
 
@@ -1126,7 +1071,7 @@ in total it's a bit more than just using UglifyJS's own parser.
 ### Uglify Fast Minify Mode
 
 It's not well known, but whitespace removal and symbol mangling accounts
-for 95% of the size reduction in minified code for most JavaScript - not
+for 95% of the size reduction in minified code for most javascript - not
 elaborate code transforms. One can simply disable `compress` to speed up
 Uglify builds by 3 to 4 times. In this fast `mangle`-only mode Uglify has
 comparable minify speeds and gzip sizes to
@@ -1149,63 +1094,3 @@ 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:
-
-- The code does not rely on preserving its runtime performance characteristics.
-  Typically uglified code will run faster due to less instructions and easier
-  inlining, but may be slower on rare occasions for a specific platform, e.g.
-  see [`reduce_funcs`](#compress-options).
-- `.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()`).
-- Earlier versions of JavaScript will throw `SyntaxError` with the following:
-  ```js
-  ({
-    p: 42,
-    get p() {},
-  });
-  // SyntaxError: Object literal may not have data and accessor property with
-  //              the same name
-  ```
-  UglifyJS may modify the input which in turn may suppress those errors.
-- Iteration order of keys over an object which contains spread syntax in later
-  versions of Chrome and Node.js may be altered.
-- 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);
-  ```
-- Use of `arguments` alongside destructuring as function parameters, e.g.
-  `function({}, arguments) {}` will result in `SyntaxError` in earlier versions
-  of Chrome and Node.js - UglifyJS may modify the input which in turn may
-  suppress those errors.

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

@@ -3,259 +3,158 @@
 
 "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", "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.",
-                "  --webkit                                 Support non-standard Safari/Webkit.",
-                "  --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":
-      case "webkit":
-        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>", "Specifiy ECMAScript release: 5, 6, 7 or 8.");
+program.option("--ie8", "Support non-standard Internet Explorer 8.");
+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("--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",
+    "sourceMap",
+    "toplevel",
+    "wrap"
+].forEach(function(name) {
+    if (name in program) {
+        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.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();
@@ -276,16 +175,13 @@ 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}", {
-            content : 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,
@@ -293,7 +189,7 @@ 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;
@@ -305,70 +201,35 @@ 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) {
-            var toplevel = result.ast;
-            if (!(toplevel instanceof UglifyJS.AST_Toplevel)) {
-                if (!(toplevel instanceof UglifyJS.AST_Statement)) toplevel = new UglifyJS.AST_SimpleStatement({
-                    body: toplevel,
-                });
-                toplevel = new UglifyJS.AST_Toplevel({
-                    body: [ toplevel ],
-                });
-            }
-            toplevel.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;
@@ -383,33 +244,33 @@ 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);
 }
@@ -434,7 +295,7 @@ 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);
@@ -454,57 +315,74 @@ 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

@@ -1,49 +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}", {
-        name: 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) {
@@ -59,6 +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)) {
@@ -68,52 +39,49 @@ 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_fnames: false,
             mangle: {},
             nameCache: null,
             output: {},
             parse: {},
-            rename: undefined,
             sourceMap: false,
             timings: false,
             toplevel: false,
-            validate: false,
             warnings: false,
-            webkit: false,
             wrap: false,
         }, true);
-        if (options.validate) AST_Node.enable_validation();
         var timings = options.timings && {
             start: Date.now()
         };
-        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_fnames", options, [ "compress", "mangle" ]);
         set_shorthand("toplevel", options, [ "compress", "mangle" ]);
-        set_shorthand("webkit", options, [ "mangle", "output" ]);
+        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,
-                webkit: false,
             }, true);
             if (options.mangle.properties) {
                 if (typeof options.mangle.properties != "object") {
@@ -136,15 +104,16 @@ 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) {
@@ -155,54 +124,39 @@ 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 (timings) timings.rename = Date.now();
-        if (options.rename) {
-            toplevel.figure_out_scope(options.mangle);
-            toplevel.expand_names(options.mangle);
+        if (options.wrap) {
+            toplevel = toplevel.wrap_commonjs(options.wrap);
         }
+        if (timings) timings.scope1 = Date.now();
+        if (options.compress) toplevel.figure_out_scope(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 (timings) timings.scope = Date.now();
+        if (options.compress) toplevel = new Compressor(options.compress).compress(toplevel);
+        if (timings) timings.scope2 = 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) {
@@ -210,12 +164,19 @@ 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]);
                     }
                 }
             }
@@ -226,14 +187,10 @@ 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;
                 }
             }
         }
@@ -246,15 +203,14 @@ function minify(files, options) {
         if (timings) {
             timings.end = Date.now();
             result.timings = {
-                parse: 1e-3 * (timings.rename - timings.parse),
-                rename: 1e-3 * (timings.compress - timings.rename),
-                compress: 1e-3 * (timings.scope - timings.compress),
-                scope: 1e-3 * (timings.mangle - timings.scope),
+                parse: 1e-3 * (timings.scope1 - timings.parse),
+                scope: 1e-3 * (timings.compress - timings.scope1 + timings.mangle - timings.scope2),
+                compress: 1e-3 * (timings.scope2 - timings.compress),
                 mangle: 1e-3 * (timings.properties - timings.mangle),
                 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;
@@ -263,7 +219,6 @@ function minify(files, options) {
     } catch (ex) {
         return { error: ex };
     } finally {
-        AST_Node.log_function();
-        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) {
@@ -111,10 +114,13 @@
             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_SymbolMethod({
+                name: args.key
+            });
             args.value = new AST_Accessor(args.value);
             if (M.kind == "get") return new AST_ObjectGetter(args);
             if (M.kind == "set") return new AST_ObjectSetter(args);
@@ -123,7 +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);
                 })
             });
@@ -132,7 +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)
                 })
@@ -162,7 +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)
@@ -174,17 +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;
@@ -194,12 +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
@@ -209,14 +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 =
@@ -249,6 +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");
@@ -325,7 +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)
         };
     });
@@ -382,7 +381,7 @@
     def_to_moz(AST_ObjectProperty, function To_Moz_Property(M) {
         var key = {
             type: "Literal",
-            value: M.key
+            value: M.key instanceof AST_SymbolMethod ? M.key.name : M.key
         };
         var kind;
         if (M instanceof AST_ObjectKeyVal) {
@@ -406,24 +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]
             }
         };
     });
@@ -484,7 +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;
@@ -499,7 +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";
@@ -511,7 +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];
@@ -554,7 +548,7 @@
         );
         MOZ_TO_ME[moztype] = moz_to_me;
         def_to_moz(mytype, me_to_moz);
-    }
+    };
 
     var FROM_MOZ_STACK = null;
 
@@ -563,28 +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;
     };
 
@@ -604,24 +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);
@@ -632,5 +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_ObjectProperty) {
-            if (node.start && node.start.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.expressions[node.expressions.length - 1], 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) {
@@ -110,24 +121,21 @@ function mangle_properties(ast, options) {
         cache: null,
         debug: false,
         keep_quoted: false,
+        only_cache: false,
         regex: null,
         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;
@@ -136,119 +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) {
+    ast.walk(new TreeWalker(function(node){
+        if (node instanceof AST_ObjectKeyVal) {
+            add(node.key);
+        }
+        else if (node instanceof AST_ObjectProperty) {
+            // setter or getter, since KeyVal is handled above
+            add(node.key.name);
+        }
+        else if (node instanceof AST_Dot) {
             add(node.property);
-        } else if (node instanceof AST_ObjectProperty) {
-            if (typeof node.key == "string") add(node.key);
-        } else if (node instanceof AST_Sub) {
+        }
+        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) {
+    // 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) {
+            // setter or getter
+            node.key.name = mangle(node.key.name);
+        }
+        else if (node instanceof AST_Dot) {
             node.property = mangle(node.property);
-        } else if (node instanceof AST_ObjectProperty) {
-            if (typeof node.key == "string") node.key = mangle(node.key);
-        } else if (node instanceof AST_Sub) {
-            if (!options.keep_quoted) mangleStrings(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 (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/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;
@@ -50,153 +52,225 @@ 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) {
+                if (!tw.after) {
+                    x = this;
+                    descend(x, tw);
+                } else {
+                    tw.stack[tw.stack.length - 1] = x = this;
+                    descend(x, tw);
+                    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) {
-        if (self.argname) self.argname = self.argname.transform(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_Await, function(self, tw) {
+
+    _(AST_Dot, function(self, tw){
         self.expression = self.expression.transform(tw);
     });
-    DEF(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_Spread, 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_Unary, function(self, tw) {
+
+    _(AST_Unary, function(self, tw){
         self.expression = self.expression.transform(tw);
     });
-    DEF(AST_Binary, function(self, 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_DestructuredArray, function(self, tw) {
-        self.elements = do_list(self.elements, tw);
-    });
-    DEF(AST_DestructuredKeyVal, function(self, tw) {
-        if (self.key instanceof AST_Node) self.key = self.key.transform(tw);
-        self.value = self.value.transform(tw);
-    });
-    DEF(AST_DestructuredObject, function(self, tw) {
+
+    _(AST_Object, function(self, tw){
         self.properties = do_list(self.properties, tw);
     });
-    DEF(AST_Object, function(self, tw) {
-        self.properties = do_list(self.properties, tw);
-    });
-    DEF(AST_ObjectProperty, function(self, tw) {
-        if (self.key instanceof AST_Node) self.key = self.key.transform(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;
+
+    _(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) {
+        for (var i = 0; i < self.segments.length; i++) {
+            if (!(self.segments[i] instanceof AST_TemplateSegment)) {
+                self.segments[i] = self.segments[i].transform(tw);
             }
         }
-        tw.pop();
-        return x;
     });
-});
+
+    _(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) ---------------------------------
 
@@ -43,25 +43,33 @@
 
 "use strict";
 
+function slice(a, start) {
+    return Array.prototype.slice.call(a, start || 0);
+};
+
 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 +78,7 @@ function configure_error_stack(fn) {
             err.name = this.name;
             try {
                 throw err;
-            } catch (e) {
+            } catch(e) {
                 return e.stack;
             }
         }
@@ -80,21 +88,27 @@ 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 +117,7 @@ function merge(obj, ext) {
         count++;
     }
     return count;
-}
+};
 
 function noop() {}
 function return_false() { return false; }
@@ -111,69 +125,164 @@ function return_true() { return true; }
 function return_this() { return this; }
 function return_null() { return null; }
 
-var List = (function() {
-    function List(a, f) {
-        var ret = [];
-        for (var i = 0; i < a.length; i++) {
+var MAP = (function(){
+    function MAP(a, f, backwards) {
+        var ret = [], top = [], i;
+        function doit() {
             var val = f(a[i], i);
-            if (val === skip) continue;
-            if (val instanceof Splice) {
-                ret.push.apply(ret, val.v);
+            var is_last = val instanceof Last;
+            if (is_last) val = val.v;
+            if (val instanceof AtTop) {
+                val = val.v;
+                if (val instanceof Splice) {
+                    top.push.apply(top, backwards ? val.v.slice().reverse() : val.v);
+                } else {
+                    top.push(val);
+                }
+            }
+            else if (val !== skip) {
+                if (val instanceof Splice) {
+                    ret.push.apply(ret, backwards ? val.v.slice().reverse() : val.v);
+                } else {
+                    ret.push(val);
+                }
+            }
+            return is_last;
+        };
+        if (a instanceof Array) {
+            if (backwards) {
+                for (i = a.length; --i >= 0;) if (doit()) break;
+                ret.reverse();
+                top.reverse();
             } else {
-                ret.push(val);
+                for (i = 0; i < a.length; ++i) if (doit()) break;
             }
         }
-        return ret;
-    }
-    List.is_op = function(val) {
-        return val === skip || val instanceof Splice;
+        else {
+            for (i in a) if (HOP(a, i)) if (doit()) break;
+        }
+        return top.concat(ret);
     };
-    List.splice = function(val) {
-        return new Splice(val);
-    };
-    var skip = List.skip = {};
-    function Splice(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) {
-        var value = props[p];
-        return value instanceof AST_Node ? value.print_to_string() : value;
+    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 makePredicate(words) {
-    if (!Array.isArray(words)) words = words.split(" ");
-    var map = Object.create(null);
-    words.forEach(function(word) {
-        map[word] = true;
+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);
+};
+
+function set_difference(a, b) {
+    return a.filter(function(el){
+        return b.indexOf(el) < 0;
     });
-    return map;
-}
+};
+
+function set_intersection(a, b) {
+    return a.filter(function(el){
+        return b.indexOf(el) >= 0;
+    });
+};
+
+// this function is taken from Acorn [1], written by Marijn Haverbeke
+// [1] https://github.com/marijnh/acorn
+function makePredicate(words) {
+    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;
@@ -197,12 +306,6 @@ 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));
@@ -216,13 +319,6 @@ 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) {
@@ -240,22 +336,20 @@ 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 instanceof AST_Call          && p.expression === node && !(p instanceof AST_New) ) ||
+            (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": "3.12.2",
+  "version": "3.1.3",
   "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": "~2.11.0",
+    "source-map": "~0.5.1"
+  },
   "devDependencies": {
-    "acorn": "~7.1.0",
-    "semver": "~6.3.0"
+    "acorn": "~5.1.1",
+    "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 +5,28 @@
 
 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",
 ];
 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 +39,6 @@ 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 +46,6 @@ 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 +58,18 @@ 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");
-    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);
-    U.AST_Node.log_function();
-    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 instanceof Error && test.expect_stdout.name === actual.name) {
-            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

@@ -1,853 +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"
-}
-
-issue_4200: {
-    options = {
-        arguments: true,
-        keep_fargs: false,
-    }
-    input: {
-        var o = {
-            get p() {
-                return arguments[0];
-            },
-        };
-        console.log(o.p);
-    }
-    expect: {
-        var o = {
-            get p() {
-                return arguments[0];
-            },
-        };
-        console.log(o.p);
-    }
-    expect_stdout: "undefined"
-}
-
-issue_4291_1: {
-    options = {
-        arguments: true,
-        keep_fargs: "strict",
-    }
-    input: {
-        console.log(function() {
-            arguments[0] = "PASS";
-            return arguments;
-        }()[0]);
-    }
-    expect: {
-        console.log(function() {
-            arguments[0] = "PASS";
-            return arguments;
-        }()[0]);
-    }
-    expect_stdout: "PASS"
-}
-
-issue_4291_2: {
-    options = {
-        arguments: true,
-        keep_fargs: "strict",
-    }
-    input: {
-        var a = function() {
-            if (arguments[0])
-                arguments[1] = "PASS";
-            return arguments;
-        }(42);
-        console.log(a[1], a[0], a.length);
-    }
-    expect: {
-        var a = function(argument_0) {
-            if (argument_0)
-                arguments[1] = "PASS";
-            return arguments;
-        }(42);
-        console.log(a[1], a[0], a.length);
-    }
-    expect_stdout: "PASS 42 1"
-}

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";
@@ -133,224 +203,50 @@ constant_join_3: {
 
 for_loop: {
     options = {
-        evaluate: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        unsafe: true,
-        unused: true,
-    }
+        unsafe      : true,
+        unused      : true,
+        evaluate    : true,
+        reduce_vars : true
+    };
     input: {
         function f0() {
             var a = [1, 2, 3];
-            var b = 0;
-            for (var i = 0; i < a.length; i++)
-                b += a[i];
-            return b;
+            for (var i = 0; i < a.length; i++) {
+                console.log(a[i]);
+            }
         }
+
         function f1() {
             var a = [1, 2, 3];
-            var b = 0;
-            for (var i = 0, len = a.length; i < len; i++)
-                b += a[i];
-            return b;
+            for (var i = 0, len = a.length; i < len; i++) {
+                console.log(a[i]);
+            }
         }
+
         function f2() {
             var a = [1, 2, 3];
-            for (var i = 0; i < a.length; i++)
+            for (var i = 0; i < a.length; i++) {
                 a[i]++;
-            return a[2];
+            }
         }
-        console.log(f0(), f1(), f2());
     }
     expect: {
         function f0() {
             var a = [1, 2, 3];
-            var b = 0;
             for (var i = 0; i < 3; i++)
-                b += a[i];
-            return b;
+                console.log(a[i]);
         }
+
         function f1() {
             var a = [1, 2, 3];
-            var b = 0;
             for (var i = 0; i < 3; i++)
-                b += a[i];
-            return b;
+                console.log(a[i]);
         }
+
         function f2() {
             var a = [1, 2, 3];
             for (var i = 0; i < a.length; i++)
                 a[i]++;
-            return a[2];
-        }
-        console.log(f0(), f1(), f2());
-    }
-    expect_stdout: "6 6 4"
-}
-
-index: {
-    options = {
-        evaluate: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unsafe: true,
-        unused: true,
-    }
-    input: {
-        var a = [ 1, 2 ];
-        console.log(a[0], a[1]);
-    }
-    expect: {
-        console.log(1, 2);
-    }
-    expect_stdout: "1 2"
-}
-
-length: {
-    options = {
-        evaluate: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unsafe: true,
-        unused: true,
-    }
-    input: {
-        var a = [ 1, 2 ];
-        console.log(a.length);
-    }
-    expect: {
-        console.log(2);
-    }
-    expect_stdout: "2"
-}
-
-index_length: {
-    options = {
-        evaluate: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unsafe: true,
-        unused: true,
-    }
-    input: {
-        var a = [ 1, 2 ];
-        console.log(a[0], a.length);
-    }
-    expect: {
-        console.log(1, 2);
-    }
-    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 +1,633 @@
+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_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: {
+        (() => {
+            var quux = () => {
+                console.log("PASS");
+            };
+            return {
+                prop() {
+                    console.log;
+                    quux();
+                }
+            };
+        })().prop();
+    }
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
+issue_2105_2: {
+    options = {
+        collapse_vars: true,
+        inline: true,
+        passes: 2,
+        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: {
+        (() => {
+            var quux = () => {
+                console.log("PASS");
+            };
+            return {
+                prop: () => {
+                    console.log;
+                    quux();
+                }
+            };
+        })().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_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_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_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,
+    }
+    input: {
+        (function(a) {
+            if (true) return;
+            var b = 42;
+        })(this);
+    }
+    expect: {
+        this, void 0;
+    }
+}
+
+issue_2084: {
+    options = {
+        unsafe_arrows: true,
+        collapse_vars: true,
+        conditionals: true,
+        ecma: 6,
+        evaluate: true,
+        inline: true,
+        passes: 2,
+        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"
+}

test/compress/ascii.js

@@ -0,0 +1,35 @@
+ascii_only_true: {
+    options = {}
+    beautify = {
+        ascii_only : true,
+        ie8        : false,
+        beautify   : false,
+    }
+    input: {
+        function f() {
+            return "\x000\x001\x007\x008\x00" +
+                   "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f" +
+                   "\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f" +
+                   "\x20\x21\x22\x23 ... \x7d\x7e\x7f\x80\x81 ... \xfe\xff\u0fff\uffff";
+        }
+    }
+    expect_exact: 'function f(){return"\\x000\\x001\\x007\\x008\\0"+"\\0\\x01\\x02\\x03\\x04\\x05\\x06\\x07\\b\\t\\n\\v\\f\\r\\x0e\\x0f"+"\\x10\\x11\\x12\\x13\\x14\\x15\\x16\\x17\\x18\\x19\\x1a\\x1b\\x1c\\x1d\\x1e\\x1f"+\' !"# ... }~\\x7f\\x80\\x81 ... \\xfe\\xff\\u0fff\\uffff\'}'
+}
+
+ascii_only_false: {
+    options = {}
+    beautify = {
+        ascii_only : false,
+        ie8        : false,
+        beautify   : false,
+    }
+    input: {
+        function f() {
+            return "\x000\x001\x007\x008\x00" +
+                   "\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f" +
+                   "\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f" +
+                   "\x20\x21\x22\x23 ... \x7d\x7e\x7f\x80\x81 ... \xfe\xff\u0fff\uffff";
+        }
+    }
+    expect_exact: 'function f(){return"\\x000\\x001\\x007\\x008\\0"+"\\0\x01\x02\x03\x04\x05\x06\x07\\b\\t\\n\\v\\f\\r\x0e\x0f"+"\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"+\' !"# ... }~\x7f\x80\x81 ... \xfe\xff\u0fff\uffff\'}'
+}

test/compress/asm.js

@@ -1,25 +1,25 @@
 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,
+        cascade       : true,
+        side_effects  : true,
+        negate_iife   : true
+    };
     input: {
         // adapted from http://asmjs.org/spec/latest/
         function asm_GeometricMean(stdlib, foreign, buffer) {
@@ -76,8 +76,9 @@ asm_mixed: {
                 start = start | 0;
                 end = end | 0;
                 var sum = 0.0, p = 0, q = 0;
-                for (p = start << 3, q = end << 3; (p | 0) < (q | 0); p = p + 8 | 0)
+                for (p = start << 3, q = end << 3; (p | 0) < (q | 0); p = p + 8 | 0) {
                     sum = sum + +log(values[p >> 3]);
+                }
                 return +sum;
             }
             function geometricMean(start, end) {
@@ -90,12 +91,12 @@ 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 +166,3 @@ 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

@@ -1,498 +1,294 @@
-await_await: {
+await_precedence: {
     input: {
-        (async function() {
-            console.log("PASS");
-            await await 42;
-        })();
+        async function f1() { await x + y; }
+        async function f2() { await (x + y); }
     }
-    expect: {
-        (async function() {
-            console.log("PASS");
-            await await 42;
-        })();
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
+    expect_exact: "async function f1(){await x+y}async function f2(){await(x+y)}"
 }
 
-defun_name: {
+await_precedence_prop: {
     input: {
-        async function await() {
-            console.log("PASS");
-        }
-        await();
+        async function f1(){ return (await foo()).bar; }
+        async function f2(){ return (await foo().bar); }
     }
-    expect: {
-        async function await() {
-            console.log("PASS");
-        }
-        await();
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
+    expect_exact: "async function f1(){return(await foo()).bar}async function f2(){return await foo().bar}"
 }
 
-nested_await: {
+await_precedence_call: {
     input: {
-        (async function() {
-            console.log(function(await) {
-                return await;
-            }("PASS"));
-        })();
+        async function f3(){ return (await foo())(); }
+        async function f4(){ return await (foo()()); }
     }
-    expect: {
-        (async function() {
-            console.log(function(await) {
-                return await;
-            }("PASS"));
-        })();
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
+    expect_exact: "async function f3(){return(await foo())()}async function f4(){return await foo()()}"
 }
 
-reduce_single_use_defun: {
-    options = {
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        async function f(a) {
-            console.log(a);
-        }
-        f("PASS");
-    }
-    expect: {
-        (async function(a) {
-            console.log(a);
-        })("PASS");
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-dont_inline: {
-    options = {
-        inline: true,
-    }
-    input: {
-        (async function() {
-            A;
-        })().catch(function() {});
-        console.log("PASS");
-    }
-    expect: {
-        (async function() {
-            A;
-        })().catch(function() {});
-        console.log("PASS");
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-evaluate: {
-    options = {
-        evaluate: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var a = async function() {}();
-        console.log(typeof a);
-    }
-    expect: {
-        var a = async function() {}();
-        console.log(typeof a);
-    }
-    expect_stdout: "object"
-    node_version: ">=8"
-}
-
-negate: {
+async_function_declaration: {
     options = {
         side_effects: true,
-    }
-    input: {
-        console && async function() {} && console.log("PASS");
-    }
-    expect: {
-        console && async function() {} && console.log("PASS");
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-negate_iife: {
-    options = {
-        negate_iife: true,
-    }
-    input: {
-        (async function() {
-            console.log("PASS");
-        })();
-    }
-    expect: {
-        !async function() {
-            console.log("PASS");
-        }();
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-collapse_vars_1: {
-    options = {
-        collapse_vars: true,
-    }
-    input: {
-        var a = "FAIL";
-        (async function() {
-            a = "PASS";
-            await 42;
-            return "PASS";
-        })();
-        console.log(a);
-    }
-    expect: {
-        var a = "FAIL";
-        (async function() {
-            a = "PASS";
-            await 42;
-            return "PASS";
-        })();
-        console.log(a);
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-collapse_vars_2: {
-    options = {
-        collapse_vars: true,
-    }
-    input: {
-        var a = "FAIL";
-        (async function() {
-            await (a = "PASS");
-            return "PASS";
-        })();
-        console.log(a);
-    }
-    expect: {
-        var a = "FAIL";
-        (async function() {
-            await (a = "PASS");
-            return "PASS";
-        })();
-        console.log(a);
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-collapse_vars_3: {
-    options = {
-        collapse_vars: true,
-    }
-    input: {
-        var a = "FAIL";
-        (async function() {
-            await (a = "PASS", 42);
-            return "PASS";
-        })();
-        console.log(a);
-    }
-    expect: {
-        var a = "FAIL";
-        (async function() {
-            await (a = "PASS", 42);
-            return "PASS";
-        })();
-        console.log(a);
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-issue_4335_1: {
-    options = {
-        inline: true,
-    }
-    input: {
-        var await = "PASS";
-        (async function() {
-            console.log(function() {
-                return await;
-            }());
-        })();
-    }
-    expect: {
-        var await = "PASS";
-        (async function() {
-            console.log(function() {
-                return await;
-            }());
-        })();
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-issue_4335_2: {
-    options = {
-        inline: true,
-    }
-    input: {
-        (async function() {
-            console.log(function() {
-                function await() {}
-                return "PASS";
-            }());
-        })();
-    }
-    expect: {
-        (async function() {
-            console.log(function() {
-                function await() {}
-                return "PASS";
-            }());
-        })();
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-issue_4337: {
-    options = {
-        reduce_vars: true,
         unused: true,
     }
     input: {
-        (function(a) {
-            a();
-        })(async function() {
-            console.log("PASS");
-        });
+        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: {
-        (function(a) {
-            (async function() {
-                console.log("PASS");
-            })();
-        })();
+        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_stdout: "PASS"
-    node_version: ">=8"
 }
 
-issue_4340: {
+async_function_expression: {
     options = {
         evaluate: true,
-        reduce_vars: true,
+        side_effects: true,
+        unused: true,
     }
     input: {
-        (async function a(a) {
-            console.log(a || "PASS");
-        })();
+        var named = async function foo() {
+            await bar(1 + 0) + (2 + 0);
+        }
+        var anon = async function() {
+            await (1 + 0) + bar(2 + 0);
+        }
     }
     expect: {
-        (async function a(a) {
-            console.log(a || "PASS");
-        })();
+        var named = async function() {
+            await bar(1);
+        };
+        var anon = async function() {
+            await 1, bar(2);
+        };
     }
-    expect_stdout: "PASS"
-    node_version: ">=8"
 }
 
-call_expression: {
-    input: {
-        console.log(typeof async function(log) {
-            (await log)("FAIL");
-        }(console.log).then);
-    }
-    expect_exact: 'console.log(typeof async function(log){(await log)("FAIL")}(console.log).then);'
-    expect_stdout: "function"
-    node_version: ">=8"
-}
-
-property_access_expression: {
-    input: {
-        console.log(typeof async function(con) {
-            (await con).log("FAIL");
-        }(console).then);
-    }
-    expect_exact: 'console.log(typeof async function(con){(await con).log("FAIL")}(console).then);'
-    expect_stdout: "function"
-    node_version: ">=8"
-}
-
-issue_4347_1: {
+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_vars: true,
+        side_effects: true,
         toplevel: true,
         unused: true,
     }
     input: {
-        var a = "foo";
-        f();
-        a = "bar";
-        f();
-        async function f() {
-            console.log(a);
-        }
+        (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: {
-        var a = "foo";
-        f();
-        a = "bar";
-        f();
-        async function f() {
-            console.log(a);
-        }
+        !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: [
-        "foo",
-        "bar",
+        "4",
+        "2",
+        "top",
+        "async_top",
     ]
     node_version: ">=8"
 }
 
-issue_4347_2: {
-    options = {
-        evaluate: true,
-        reduce_vars: true,
+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,
-        unused: true,
     }
     input: {
-        var a = "PASS";
-        (async function() {
-            throw 42;
-            a = "FAIL";
+        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({});
         })();
-        console.log(a);
     }
-    expect: {
-        var a = "PASS";
-        (async function() {
-            throw 42;
-            a = "FAIL";
+    expect_exact: "(async()=>{await fetch({})})();"
+}
+
+async_arrow_iife_negate_iife: {
+    options = {
+        negate_iife: true,
+    }
+    input: {
+        (async () => {
+            await fetch();
+        })();
+        (() => {
+            plain();
         })();
-        console.log(a);
     }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-issue_4349_1: {
-    input: {
-        console.log(typeof async function() {
-            await /abc/;
-        }().then);
-    }
-    expect_exact: "console.log(typeof async function(){await/abc/}().then);"
-    expect_stdout: "function"
-    node_version: ">=8"
-}
-
-issue_4349_2: {
-    options = {
-        collapse_vars: true,
-        unused: true,
-    }
-    input: {
-        console.log(typeof async function() {
-            (function(a) {
-                this[a];
-            }(await 0));
-        }().then);
-    }
-    expect: {
-        console.log(typeof async function() {
-            (function(a) {
-                this[a];
-            }(await 0));
-        }().then);
-    }
-    expect_stdout: "function"
-    node_version: ">=8"
-}
-
-issue_4349_3: {
-    options = {
-        collapse_vars: true,
-        unused: true,
-    }
-    input: {
-        console.log(typeof function(await) {
-            return async function(a) {
-                this[a];
-            }(await);
-        }(this).then);
-    }
-    expect: {
-        console.log(typeof function(await) {
-            return async function(a) {
-                this[a];
-            }(await);
-        }(this).then);
-    }
-    expect_stdout: "function"
-    node_version: ">=8"
-}
-
-issue_4359: {
-    options = {
-        collapse_vars: true,
-        unused: true,
-    }
-    input: {
-        try {
-            (async function(a) {
-                return a;
-            })(A);
-        } catch (e) {
-            console.log("PASS");
-        }
-    }
-    expect: {
-        try {
-            (async function(a) {
-                return a;
-            })(A);
-        } catch (e) {
-            console.log("PASS");
-        }
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-issue_4377: {
-    options = {
-        dead_code: true,
-        inline: true,
-        side_effects: true,
-    }
-    input: {
-        console.log(typeof function() {
-            return function() {
-                f;
-                async function f() {}
-                return f();
-            }();
-        }().then);
-    }
-    expect: {
-        console.log(typeof function() {
-            return f();
-            async function f() {}
-        }().then);
-    }
-    expect_stdout: "function"
-    node_version: ">=8"
+    expect_exact: "(async()=>{await fetch()})();(()=>{plain()})();"
 }

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

@@ -1,183 +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"
-}
-
-issue_4374: {
-    options = {
-        booleans: true,
-        conditionals: true,
-        if_return: true,
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        (function() {
-            console.log(f());
-            function f(a) {
-                if (null) return 0;
-                if (a) return 1;
-                return 0;
-            }
-        })();
-    }
-    expect: {
-        (function() {
-            console.log(function(a) {
-                return !null && a ? 1 : 0;
-            }());
-        })();
-    }
-    expect_stdout: "0"
-}

test/compress/comparing.js

@@ -0,0 +1,76 @@
+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;
+    }
+}

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 + "",
@@ -237,55 +221,3 @@ concat_8: {
     }
     expect_stdout: true
 }
-
-concat_9: {
-    options = {
-        booleans: true,
-        evaluate: true,
-        reduce_vars: true,
-        strings: true,
-        toplevel: true,
-    }
-    input: {
-        var a = "foo";
-        console.log(
-            12 + (34 + a),
-            null + (34 + a),
-            12 + (null + a),
-            false + (34 + a),
-            12 + (false + a),
-            "bar" + (34 + a),
-            12 + ("bar" + a)
-        );
-    }
-    expect: {
-        var a = "foo";
-        console.log(
-            "1234" + a,
-            "null34" + a,
-            "12null" + a,
-            !1 + (34 + a),
-            12 + (!1 + a),
-            "bar34" + a,
-            "12bar" + a
-        );
-    }
-    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/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 +1,661 @@
+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_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];
+
+        if (Math)
+            print(a);
+        else
+            print(b);
+
+        if (Math)
+            print(...a);
+        else
+            print(b);
+
+        if (Math.no_such_property)
+            print(a);
+        else
+            print(...b);
+    }
+    expect: {
+        function print(...x) {
+            console.log(...x);
+        }
+        var a = [ 1, 2 ], b = [ 3, 4 ];
+        print(Math ? a : b);
+        Math ? print(...a) : print(b);
+        Math.no_such_property ? print(a) : print(...b);
+    }
+    expect_stdout: [
+        "[ 1, 2 ]",
+        "1 2",
+        "3 4",
+    ]
+    node_version: ">=6"
+}

test/compress/export.js

@@ -0,0 +1,252 @@
+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_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_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();
+    }
+}

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]',
     ]
 }
 
@@ -197,7 +184,6 @@ issue_2167: {
         global_defs: {
             "@isDevMode": "function(){}",
         },
-        passes: 2,
         side_effects: true,
     }
     input: {
@@ -210,23 +196,3 @@ 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/harmony.js

@@ -0,0 +1,841 @@
+arrow_function_parens: {
+    input: {
+        something && (() => {});
+    }
+    expect_exact: "something&&(()=>{});"
+}
+arrow_function_parens_2: {
+    input: {
+        (() => null)();
+    }
+    expect_exact: "(()=>null)();"
+}
+
+typeof_arrow_functions: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        var foo = typeof (x => null);
+        console.log(foo);
+    }
+    expect_exact: "var foo=\"function\";console.log(foo);"
+    expect_stdout: "function"
+    node_version: ">=4"
+}
+
+classes: {
+    input: {
+        class SomeClass {
+            constructor() {
+            };
+            foo() {};
+        };
+        class NoSemi {
+            constructor(...args) {
+            }
+            foo() {}
+        };
+        class ChildClass extends SomeClass {};
+        var asExpression = class AsExpression {};
+        var nameless = class {};
+    }
+    expect_exact: "class SomeClass{constructor(){}foo(){}}class NoSemi{constructor(...args){}foo(){}}class ChildClass extends SomeClass{}var asExpression=class AsExpression{};var nameless=class{};"
+}
+
+class_statics: {
+    input: {
+        x = class {
+            static staticMethod() {}
+            static get foo() {}
+            static set bar() {}
+            static() { /* "static" can be a method name! */ }
+            get() { /* "get" can be a method name! */ }
+            set() { /* "set" can be a method name! */ }
+        }
+    }
+    expect_exact: "x=class{static staticMethod(){}static get foo(){}static set bar(){}static(){}get(){}set(){}};"
+}
+
+class_name_can_be_mangled: {
+    mangle = { };
+    input: {
+        function x() {
+            class Foo {
+            }
+            var class1 = Foo;
+            var class2 = class Bar {};
+        }
+    }
+    expect: {
+        function x() {
+            class a { }
+            var s = a;
+            var c = class a {};
+        }
+    }
+}
+
+class_name_can_be_preserved: {
+    mangle = {
+        keep_classnames: true
+    }
+    input: {
+        function x() {
+            (class Baz { });
+            class Foo {};
+        }
+    }
+    expect: {
+        function x() {
+            (class Baz { });
+            class Foo {};
+        }
+    }
+}
+
+classes_can_have_generators: {
+    input: {
+        class Foo {
+            *bar() {}
+            static *baz() {}
+        }
+    }
+    expect: {
+        class Foo {
+            *bar() {}
+            static *baz() {}
+        }
+    }
+}
+
+classes_can_have_computed_generators: {
+    input: {
+        class C4 {
+            *['constructor']() {}
+        }
+    }
+    expect: {
+        class C4 {
+            *['constructor']() {}
+        }
+    }
+}
+
+classes_can_have_computed_static: {
+    input: {
+        class C4 {
+            static ['constructor']() {}
+        }
+    }
+    expect: {
+        class C4 {
+            static ['constructor']() {}
+        }
+    }
+}
+
+class_methods_and_getters_with_keep_quoted_props_enabled: {
+    beautify = {
+        quote_style: 3,
+        keep_quoted_props: true,
+    }
+    input: {
+        class clss {
+            a() {}
+            "b"() {}
+            get c() { return "c"}
+            get "d"() { return "d"}
+            set e(a) { doSomething(a); }
+            set 'f'(a) { doSomething(b); }
+            static g() {}
+            static "h"() {}
+        }
+    }
+    expect_exact: 'class clss{a(){}"b"(){}get c(){return"c"}get"d"(){return"d"}set e(a){doSomething(a)}set\'f\'(a){doSomething(b)}static g(){}static"h"(){}}'
+}
+
+classes_with_expression_as_expand: {
+    input: {
+        class D extends (calls++, C) {}
+    }
+    expect_exact: "class D extends(calls++,C){}"
+}
+
+new_target: {
+    input: {
+        new.target;
+        new.target.name;
+    }
+    expect_exact: "new.target;new.target.name;"
+}
+
+number_literals: {
+    input: {
+        0b1001;
+        0B1001;
+        0o11;
+        0O11;
+    }
+
+    expect: {
+        9;
+        9;
+        9;
+        9;
+    }
+}
+
+import_statement: {
+    input: {
+        import "mod-name";
+        import Foo from "bar";
+        import { Bar, Baz } from 'lel';
+        import Bar, { Foo } from 'lel';
+        import { Bar as kex, Baz as food } from 'lel';
+    }
+    expect_exact: 'import"mod-name";import Foo from"bar";import{Bar,Baz}from"lel";import Bar,{Foo}from"lel";import{Bar as kex,Baz as food}from"lel";'
+}
+
+import_all_statement: {
+    input: {
+        import * from 'lel';
+        import * as Lel from 'lel';
+    }
+    expect_exact: 'import*from"lel";import*as Lel from"lel";'
+}
+
+export_statement: {
+    options = {
+        evaluate: true,
+    }
+    input: {
+        export default 1 + 2;
+        export var a = 4;
+        export let b = 6;
+        export const c = 6;
+        export function d() {};
+        export class e {};
+    }
+    expect_exact: "export default 3;export var a=4;export let b=6;export const c=6;export function d(){};export class e{};"
+}
+
+export_default_object_expression: {
+    options = {
+        evaluate: true,
+    }
+    input: {
+        export default {
+            foo: 1 + 2,
+            bar() { return 4; },
+            get baz() { return this.foo; },
+        };
+    }
+    expect_exact: "export default{foo:3,bar(){return 4},get baz(){return this.foo}};"
+}
+
+export_default_array: {
+    options = {
+        evaluate: true,
+    }
+    input: {
+        export default [ 1 + 2, foo ];
+    }
+    expect_exact: "export default[3,foo];"
+}
+
+export_default_anon_function: {
+    options = {
+        evaluate: true,
+    }
+    input: {
+        export default function(){
+            console.log(1 + 2);
+        }
+    }
+    expect_exact: "export default function(){console.log(3)};"
+}
+
+export_default_anon_class: {
+    options = {
+        evaluate: true,
+    }
+    input: {
+        export default class {
+            foo() { console.log(1 + 2); }
+        }
+    }
+    expect_exact: "export default class{foo(){console.log(3)}};"
+}
+
+export_module_statement: {
+    input: {
+        export * from "a.js";
+        export {A} from "a.js";
+        export {A, B} from "a.js";
+        export {C};
+    }
+    expect_exact: 'export*from"a.js";export{A}from"a.js";export{A,B}from"a.js";export{C};'
+}
+
+import_statement_mangling: {
+    mangle = { toplevel: true };
+    input: {
+        import Foo from "foo";
+        import Bar, {Food} from "lel";
+        import {What as Whatever} from "lel";
+        Foo();
+        Bar();
+        Food();
+        Whatever();
+    }
+    expect: {
+        import o from "foo";
+        import m, {Food as r} from "lel";
+        import {What as f} from "lel";
+        o();
+        m();
+        r();
+        f();
+    }
+}
+
+export_statement_mangling: {
+    mangle = { };
+    input: {
+        export var foo = 6;
+        export function bar() { }
+        export class Baz { }
+        bar(foo, Baz)
+    }
+    expect: {
+        export var foo = 6;
+        export function bar() { }
+        export class Baz { }
+        bar(foo, Baz)
+    }
+}
+
+// https://github.com/mishoo/UglifyJS2/issues/1021
+regression_for_of_const: {
+    input: {
+        for (const x of y) {}
+        for (const x in y) {}
+    }
+    expect: {
+        for (const x of y);for (const x in y);
+    }
+}
+
+// Fabio: My patches accidentally caused a crash whenever
+// there's an extraneous set of parens around an object.
+regression_cannot_destructure: {
+    input: {
+        var x = ({ x : 3 });
+        x(({ x: 3 }));
+    }
+    expect_exact: "var x={x:3};x({x:3});";
+}
+
+regression_cannot_use_of: {
+    input: {
+        function of() {
+        }
+        var of = "is a valid variable name";
+        of = { of: "is ok" };
+        x.of;
+        of: foo()
+    }
+    expect: {
+        function of(){}
+        var of="is a valid variable name";
+        of={of:"is ok"};
+        x.of;
+        foo();  /* Label statement missing? No prob. */
+    }
+}
+
+fat_arrow_as_param: {
+    input: {
+        foo(x => x);
+        foo(x => x, y => y);
+
+        foo(x => (x, x));
+        foo(x => (x, x), y => (y, y));
+    }
+    expect_exact: "foo(x=>x);foo(x=>x,y=>y);foo(x=>(x,x));foo(x=>(x,x),y=>(y,y));"
+}
+
+default_assign: {
+    options = {
+        keep_fargs: false,
+        unused: true,
+    }
+    input: {
+        function f(a, b = 3) {
+            console.log(a);
+        }
+
+        g = ([[] = 123]) => {};
+        h = ([[x, y, z] = [4, 5, 6]] = []) => {};
+
+        function i([[x, y, z] = [4, 5, 6]] = []) {
+            console.log(b);
+        };
+    }
+    expect: {
+        function f(a) {
+            console.log(a);
+        }
+
+        g = ([[] = 123]) => {};
+        h = ([[x, y, z] = [4, 5, 6]] = []) => {};
+
+        function i([[x, y, z] = [4, 5, 6]] = []) {
+            console.log(b);
+        };
+    }
+}
+
+expansion: {
+    options = {
+        keep_fargs: false,
+        unused: true,
+    }
+    input: {
+        function f(a, ...b) {
+            console.log(a);
+        }
+    }
+    expect: {
+        function f(a) {
+            console.log(a);
+        }
+    }
+}
+
+issue_1613: {
+  mangle = { toplevel: true };
+  input: {
+    const name = 1;
+    const foo = {
+      name
+    };
+  }
+  expect_exact: "const n=1;const c={name:n};"
+}
+
+format_methods: {
+    beautify = {
+        beautify: true,
+    }
+    input: {
+        class A extends B {constructor(a){x()} static s(b,c){y()} run(d,e,f){z()}}
+    }
+    expect_exact: [
+        "class A extends B {",
+        "    constructor(a) {",
+        "        x();",
+        "    }",
+        "    static s(b, c) {",
+        "        y();",
+        "    }",
+        "    run(d, e, f) {",
+        "        z();",
+        "    }",
+        "}",
+    ]
+}
+
+issue_1898: {
+    options = {
+    }
+    mangle = {
+    }
+    input: {
+        class Foo {
+            bar() {
+                for (const x of [ 6, 5 ]) {
+                    for (let y of [ 4, 3 ]) {
+                        for (var z of [ 2, 1 ]) {
+                            console.log(x, y, z);
+                        }
+                    }
+                }
+            }
+        }
+        new Foo().bar();
+    }
+    expect: {
+        class Foo {
+            bar() {
+                for (const f of [ 6, 5 ])
+                    for (let r of [ 4, 3 ])
+                        for (var o of [ 2, 1 ])
+                            console.log(f, r, o);
+            }
+        }
+        new Foo().bar();
+    }
+}
+
+issue_1753: {
+    mangle = { safari10: true };
+    input: {
+        class SomeClass {
+            constructor(props) {
+                let pickedSets = [];
+                for (let i = 0; i < 6; i++) {
+                    pickedSets.push({
+                        mainDrawNumbers: [],
+                        extraDrawNumbers: []
+                    });
+                }
+            }
+        }
+    }
+    expect: {
+        class SomeClass {
+            constructor(r) {
+                let s = [];
+                for (let a = 0; a < 6; a++)
+                    s.push({
+                        mainDrawNumbers: [],
+                        extraDrawNumbers: []
+                    });
+            }
+        }
+    }
+}
+
+issue_1753_disable: {
+    mangle = { safari10: false }
+    input: {
+        class SomeClass {
+            constructor(props) {
+                let pickedSets = [];
+                for (let i = 0; i < 6; i++) {
+                    pickedSets.push({
+                        mainDrawNumbers: [],
+                        extraDrawNumbers: []
+                    });
+                }
+            }
+        }
+    }
+    expect: {
+        class SomeClass {
+            constructor(r) {
+                let s = [];
+                for (let r = 0; r < 6; r++)
+                    s.push({
+                        mainDrawNumbers: [],
+                        extraDrawNumbers: []
+                    });
+            }
+        }
+    }
+}
+
+class_extends: {
+    options = {
+        evaluate: true,
+    }
+    input: {
+        function f() {
+            class foo extends bar {}
+            class pro extends some.prop {}
+            class arr extends stuff[1 - 1] {}
+            class bin extends (a || b) {}
+            class seq extends (a, b) {}
+            class ter extends (a ? b : c) {}
+            class uni extends (!0) {}
+        }
+    }
+    expect_exact: "function f(){class foo extends bar{}class pro extends some.prop{}class arr extends stuff[0]{}class bin extends(a||b){}class seq extends(a,b){}class ter extends(a?b:c){}class uni extends(!0){}}"
+}
+
+class_extends_class: {
+    options = {
+    }
+    input: {
+        class anon extends class {} {}
+        class named extends class base {} {}
+    }
+    expect_exact: "class anon extends class{}{}class named extends class base{}{}"
+}
+
+class_extends_function: {
+    options = {
+    }
+    input: {
+        class anon extends function(){} {}
+        class named extends function base(){} {}
+    }
+    expect_exact: "class anon extends function(){}{}class named extends function base(){}{}"
+}
+
+class_extends_regex: {
+    options = {
+    }
+    input: {
+        function f() {
+            class rx1 extends (/rx/) {}
+            // class rx2 extends /rx/ {}  // FIXME - parse error
+        }
+    }
+    expect_exact: "function f(){class rx1 extends(/rx/){}}"
+}
+
+issue_2028: {
+    options = {
+        side_effects: true,
+    }
+    input: {
+        var a = {};
+        (function(x) {
+            x.X = function() {
+                return X;
+            };
+            class X {
+                static hello() {
+                    console.log("hello");
+                }
+            }
+        }(a));
+        a.X().hello();
+    }
+    expect: {
+        var a = {};
+        (function(x) {
+            x.X = function() {
+                return X;
+            };
+            class X {
+                static hello() {
+                    console.log("hello");
+                }
+            }
+        }(a));
+        a.X().hello();
+    }
+    expect_stdout: "hello"
+    node_version: ">=6"
+}
+
+class_expression_statement: {
+    options = {
+        toplevel: false,
+        side_effects: false,
+        unused: false,
+    }
+    input: {
+        (class {});
+        (class NamedClassExpr {});
+        let expr = (class AnotherClassExpr {});
+        class C {}
+    }
+    expect_exact: "(class{});(class NamedClassExpr{});let expr=class AnotherClassExpr{};class C{}"
+}
+
+class_expression_statement_unused: {
+    options = {
+        toplevel: false,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        (class {});
+        (class NamedClassExpr {});
+        let expr = (class AnotherClassExpr {});
+        class C {}
+    }
+    expect_exact: "let expr=class{};class C{}"
+}
+
+class_expression_statement_unused_toplevel: {
+    options = {
+        toplevel: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        (class {});
+        (class NamedClassExpr {});
+        let expr = (class AnotherClassExpr {});
+        class C {}
+    }
+    expect_exact: ""
+}
+
+export_default_function_decl: {
+    options = {
+        toplevel: true,
+        passes: 3,
+        unused: true,
+    }
+    input: {
+        // do not drop "unused" exports
+        export default function Foo() {};
+        export function Far() {};
+    }
+    expect_exact: "export default function Foo(){};export function Far(){};"
+}
+
+export_default_class_decl: {
+    options = {
+        toplevel: true,
+        passes: 3,
+        unused: true,
+    }
+    input: {
+        // do not drop "unused" exports
+        export default class Car {};
+        export class Cab {};
+    }
+    expect_exact: "export default class Car{};export class Cab{};"
+}
+
+object_rest_spread: {
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        var   { w: w1, ...V } = { w: 7, x: 1, y: 2 }; console.log(w1, V);
+        let   { w: w2, ...L } = { w: 8, x: 3, y: 4 }; console.log(w2, L);
+        const { w: w3, ...C } = { w: 9, x: 5, y: 6 }; console.log(w3, C);
+
+        let b;
+        ({ b, ...V } = { a: 1, b: 2, c: 3 }); console.log(V);
+        ({ b, ...L } = { a: 4, b: 5, c: 6 }); console.log(L);
+
+        (function({ y, ...p }){ console.log(p); })({ x: 1, y: 2, z: 3 });
+        (({ y, ...p }) =>     { console.log(p); })({ x: 4, y: 5, z: 6 });
+
+        const T = { a: 1, b: 2 }; console.log({ ...T, w: 0, ...{}, ...L, ...{K: 9} });
+    }
+    expect: {
+        var   { w: o, ...l } = { w: 7, x: 1, y: 2 }; console.log(o, l);
+        let   { w: c, ...n } = { w: 8, x: 3, y: 4 }; console.log(c, n);
+        const { w: e, ...s } = { w: 9, x: 5, y: 6 }; console.log(e, s);
+
+        let g;
+        ({ b: g, ...l } = { a: 1, b: 2, c: 3 }); console.log(l);
+        ({ b: g, ...n } = { a: 4, b: 5, c: 6 }); console.log(n);
+
+        (function({ y: o, ...l }) { console.log(l); })({ x: 1, y: 2, z: 3 });
+        (({ y: o, ...l }) =>      { console.log(l); })({ x: 4, y: 5, z: 6 });
+
+        const w = { a: 1, b: 2 }; console.log({ ...w, w: 0, ...{}, ...n, ...{ K: 9 } });
+    }
+}
+
+object_spread_unsafe: {
+    options = {
+        collapse_vars: true,
+        evaluate: true,
+        join_vars: true,
+        passes: 3,
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unsafe: true,
+        unused: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        var o1 = { x: 1, y: 2 };
+        var o2 = { x: 3, z: 4 };
+        var cloned = { ...o1 };
+        var merged = { ...o1, ...o2 };
+        console.log(cloned, merged);
+    }
+    expect: {
+        var o = { x: 1, y: 2 }, l = { ...o }, x = { ...o, ...{ x: 3, z: 4 } };
+        console.log(l, x);
+    }
+}
+
+array_spread_of_sequence: {
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        var a = [1];
+        console.log([...(a, a)]);
+        console.log([...a, a]);
+        console.log([...(a || a)]);
+        console.log([...a || a]);
+    }
+    expect: {
+        var o = [1];
+        console.log([...(o, o)]);
+        console.log([...o, o]);
+        console.log([...o || o]);
+        console.log([...o || o]);
+    }
+    expect_stdout: [
+        "[ 1 ]",
+        "[ 1, [ 1 ] ]",
+        "[ 1 ]",
+        "[ 1 ]",
+    ]
+    node_version: ">=6"
+}
+
+object_spread_of_sequence: {
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        var a = {x: 1};
+        console.log({ ...(a, a) });
+        console.log({ ...a, a });
+        console.log({ ...(a || a) });
+        console.log({ ...a || a });
+    }
+    expect: {
+        var o = { x: 1 };
+        console.log({ ...(o, o) });
+        console.log({ ...o, a: o });
+        console.log({ ...o || o });
+        console.log({ ...o || o });
+    }
+}
+
+// issue 2316
+class_name_can_be_preserved_with_reserved: {
+    mangle = {
+        reserved: [ "Foo" ],
+    }
+    input: {
+        function x() {
+            class Foo {}
+            Foo.bar;
+            class Bar {}
+            Bar.foo;
+        }
+        function y() {
+            var Foo = class Foo {};
+            Foo.bar;
+            var Bar = class Bar {};
+            Bar.bar;
+        }
+    }
+    expect: {
+        function x() {
+            class Foo {}
+            Foo.bar;
+            class a {}
+            a.foo;
+        }
+        function y() {
+            var Foo = class Foo {};
+            Foo.bar;
+            var a = class a {};
+            a.bar;
+        }
+    }
+}

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/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() {
@@ -327,424 +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: {
-    options = {
-        conditionals: true,
-        if_return: true,
-        inline: true,
-        sequences: true,
-        side_effects: true,
-    }
-    input: {
-        (function() {
-            if (console)
-                return console.log("PASS");
-            console.log("FAIL");
-        })();
-    }
-    expect: {
-        console ? console.log("PASS") : console.log("FAIL");
-    }
-    expect_stdout: "PASS"
-}
-
-nested_if_break: {
+issue_1317_strict: {
     options = {
         if_return: true,
     }
     input: {
-        for (var i = 0; i < 3; i++)
-            L1: if ("number" == typeof i) {
-                if (0 === i) break L1;
-                console.log(i);
+        "use strict";
+        !function(a) {
+            if (a) return;
+            let b = 1;
+            function g() {
+                return b;
             }
+            console.log(g());
+        }();
     }
     expect: {
-        for (var i = 0; i < 3; i++)
-            L1: if ("number" == typeof i)
-                if (0 !== i) console.log(i);
-    }
-    expect_stdout: [
-        "1",
-        "2",
-    ]
-}
-
-nested_if_continue: {
-    options = {
-        conditionals: true,
-        if_return: true,
-        join_vars: true,
-        loops: true,
-    }
-    input: {
-        function f(n) {
-            var i = 0;
-            do {
-                if ("number" == typeof n) {
-                    if (0 === n) {
-                        console.log("even", i);
-                        continue;
-                    }
-                    if (1 === n) {
-                        console.log("odd", i);
-                        continue;
-                    }
-                    i++;
-                }
-            } while (0 <= (n -= 2));
-        }
-        f(37);
-        f(42);
-    }
-    expect: {
-        function f(n) {
-            for (var i = 0;
-                "number" == typeof n
-                    && (0 !== n
-                        ? 1 !== n
-                            ? i++
-                            : console.log("odd", i)
-                        : console.log("even", i)),
-                0 <= (n -= 2););
-        }
-        f(37);
-        f(42);
-    }
-    expect_stdout: [
-        "odd 18",
-        "even 21",
-    ]
-}
-
-nested_if_return: {
-    options = {
-        conditionals: true,
-        if_return: true,
-    }
-    input: {
-        function f() {
-            if (A) {
-                if (B)
-                    return B;
-                if (C)
-                    return D;
-                if (E)
-                    return F;
-                if (G)
-                    return H;
-                if (I) {
-                    if (J)
-                        return K;
-                    return;
-                }
-                if (L) {
-                    if (M)
-                        return;
-                    return N;
-                }
+        "use strict";
+        !function(a) {
+            if (a) return;
+            let b = 1;
+            function g() {
+                return b;
             }
-        }
-    }
-    expect: {
-        function f() {
-            if (A)
-                return B || (C ? D : E ? F : G ? H : I ? J ? K : void 0 : L && !M ? N : void 0);
-        }
-    }
-}
-
-issue_866_1: {
-    options = {
-        conditionals: true,
-        if_return: true,
-        sequences: false,
-    };
-    input: {
-        function f(a) {
-            if (a)
-                return "";
-            console.log(a);
-        }
-    }
-    expect: {
-        function f(a) {
-            if (a)
-                return "";
-            console.log(a);
-        }
-    }
-}
-
-issue_866_2: {
-    options = {
-        conditionals: true,
-        if_return: true,
-        sequences: true,
-    }
-    input: {
-        (function() {
-            if (a)
-                if (b)
-                    c;
-                else
-                    return d;
-        })();
-    }
-    expect: {
-        (function() {
-            if (a) {
-                if (!b)
-                    return d;
-                c;
-            }
-        })();
+            console.log(g());
+        }();
     }
+    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, cascade: 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, cascade: true, side_effects: true,
+        collapse_vars: false, passes: 2, warnings: "verbose"
     }
     input: {
         function foo(x) {
@@ -84,34 +65,28 @@ non_hoisted_function_after_return_2a: {
         }
     }
     expect_warnings: [
-        "WARN: Dropping initialization in unreachable code [test/compress/issue-1034.js:4,16]",
-        "WARN: Dropping initialization 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: 35",
-        "WARN: Dropping initialization 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: 35, 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, cascade: true, side_effects: true,
+        collapse_vars: false
     }
     input: {
         function foo(x) {
@@ -135,25 +110,20 @@ non_hoisted_function_after_return_2b: {
         }
     }
     expect_warnings: [
-        "WARN: Dropping initialization 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, cascade: true, side_effects: true
     }
     input: {
         "use strict";
@@ -175,7 +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 }
         }
@@ -183,29 +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, cascade: true, side_effects: true,
+        collapse_vars: false, passes: 2, warnings: "verbose"
     }
     input: {
         "use strict";
@@ -236,34 +196,28 @@ non_hoisted_function_after_return_2a_strict: {
     }
     expect_stdout: "5 6"
     expect_warnings: [
-        "WARN: Dropping initialization in unreachable code [test/compress/issue-1034.js:5,16]",
-        "WARN: Dropping initialization 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: 46",
-        "WARN: Dropping initialization 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: 46, 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, cascade: true, side_effects: true,
+        collapse_vars: false
     }
     input: {
         "use strict";
@@ -292,7 +246,11 @@ non_hoisted_function_after_return_2b_strict: {
     }
     expect_stdout: "5 6"
     expect_warnings: [
-        "WARN: Dropping initialization 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 +1,21 @@
+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 || {};
@@ -17,9 +29,8 @@ const_pragma: {
 not_const: {
     options = {
         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

@@ -16,7 +16,7 @@ multiple_functions: {
         ( function() {
             // NOTE: other compression steps will reduce this
             // down to just `window`.
-            if ( !window );
+            if ( window );
             function f() {}
             function g() {}
         } )();
@@ -38,7 +38,7 @@ single_function: {
     }
     expect: {
         ( function() {
-            if ( !window );
+            if ( window );
             function f() {}
         } )();
     }
@@ -67,7 +67,7 @@ deeply_nested: {
             // NOTE: other compression steps will reduce this
             // down to just `window`.
             if ( window )
-                if ( !document );
+                if (document);
             function f() {}
             function g() {}
             function h() {}
@@ -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() {
@@ -148,57 +148,52 @@ check_drop_unused_in_peer_function: {
 
 Infinity_not_in_with_scope: {
     options = {
-        unused: true,
+        unused: true
     }
     input: {
-        var o = { Infinity: "FAIL" };
+        var o = { Infinity: 'oInfinity' };
         var vInfinity = "Infinity";
         vInfinity = Infinity;
-        console.log(vInfinity);
     }
     expect: {
-        var o = { Infinity: "FAIL" };
-        var vInfinity = "Infinity";
-        vInfinity = 1/0;
-        console.log(vInfinity);
+        var o = { Infinity: 'oInfinity' }
+        var vInfinity = "Infinity"
+        vInfinity = 1/0
     }
-    expect_stdout: "Infinity"
 }
 
 Infinity_in_with_scope: {
     options = {
-        unused: true,
+        unused: true
     }
     input: {
-        var o = { Infinity: "PASS" };
+        var o = { Infinity: 'oInfinity' };
         var vInfinity = "Infinity";
         with (o) { vInfinity = Infinity; }
-        console.log(vInfinity);
     }
     expect: {
-        var o = { Infinity: "PASS" };
-        var vInfinity = "Infinity";
-        with (o) vInfinity = Infinity;
-        console.log(vInfinity);
+        var o = { Infinity: 'oInfinity' }
+        var vInfinity = "Infinity"
+        with (o) vInfinity = Infinity
     }
-    expect_stdout: "PASS"
 }
 
 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,
+        cascade:       true,
+        side_effects:  true,
+        sequences:     false,
         keep_infinity: false,
-        sequences: false,
-        side_effects: true,
-        unused: true,
     }
     input: {
         var f = console.log;
@@ -248,19 +243,20 @@ 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,
+        cascade:       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,
+        cascade       : 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,
+        cascade       : 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 +1,15 @@
 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,
+        cascade      : true,
+        negate_iife  : true,
     }
     input: {
         // pure top-level IIFE will be dropped
@@ -48,28 +49,29 @@ 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:17,8]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:17,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:30,37]",
+        "WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:30,16]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:28,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:38,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:39,31]",
     ]
 }
 
 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,
+        cascade      : true,
+        negate_iife  : true,
+        toplevel     : true,
     }
     input: {
         // pure top-level IIFE will be dropped
@@ -110,17 +112,17 @@ 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:79,8]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:79,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:92,37]",
+        "WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:92,16]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:90,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:107,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:108,31]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:84,33]",
+        "WARN: Dropping unused variable iife1 [test/compress/issue-1261.js:84,12]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:100,45]",
+        "WARN: Dropping unused variable MyClass [test/compress/issue-1261.js:100,12]",
     ]
 }
 
@@ -155,29 +157,29 @@ 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:137,61]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:137,23]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:137,23]",
+        "WARN: Boolean || always true [test/compress/issue-1261.js:138,23]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:138,23]",
+        "WARN: Condition always true [test/compress/issue-1261.js:138,23]",
+        "WARN: Condition left of || always true [test/compress/issue-1261.js:139,8]",
+        "WARN: Condition always true [test/compress/issue-1261.js:139,8]",
+        "WARN: Boolean && always false [test/compress/issue-1261.js:140,23]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:140,23]",
+        "WARN: Condition always false [test/compress/issue-1261.js:140,23]",
+        "WARN: Condition left of && always false [test/compress/issue-1261.js:141,8]",
+        "WARN: Condition always false [test/compress/issue-1261.js:141,8]",
+        "WARN: + in boolean context always true [test/compress/issue-1261.js:142,23]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:142,23]",
+        "WARN: Condition always true [test/compress/issue-1261.js:142,23]",
+        "WARN: + in boolean context always true [test/compress/issue-1261.js:143,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:143,31]",
+        "WARN: Condition always true [test/compress/issue-1261.js:143,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:144,23]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:145,24]",
+        "WARN: Condition always true [test/compress/issue-1261.js:145,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:146,31]",
+        "WARN: Condition always false [test/compress/issue-1261.js:146,8]",
     ]
 }

test/compress/issue-1275.js

@@ -1,16 +1,17 @@
 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,
+        cascade       : 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 +22,18 @@ 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,
+        cascade      : true,
+        conditionals : false,
     }
     input: {
         for (var i = 1; i <= 4; ++i) {

test/compress/issue-1466.js

@@ -0,0 +1,291 @@
+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,
+        cascade: 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,
+        cascade: 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,
+        cascade: 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,
+        cascade: 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,
+        cascade: 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,
+        cascade: 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,
+        cascade: 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

@@ -2,7 +2,6 @@ chained_evaluation_1: {
     options = {
         collapse_vars: true,
         evaluate: true,
-        reduce_funcs: true,
         reduce_vars: true,
         unused: true,
     }
@@ -29,7 +28,6 @@ chained_evaluation_2: {
     options = {
         collapse_vars: true,
         evaluate: true,
-        reduce_funcs: true,
         reduce_vars: true,
         unused: true,
     }
@@ -52,30 +50,3 @@ 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

@@ -1,7 +1,8 @@
+
 issue_1639_1: {
     options = {
         booleans: true,
-        collapse_vars: true,
+        cascade: true,
         conditionals: true,
         evaluate: true,
         join_vars: true,
@@ -11,6 +12,7 @@ issue_1639_1: {
     }
     input: {
         var a = 100, b = 10;
+
         var L1 = 5;
         while (--L1 > 0) {
             if ((--b), false) {
@@ -19,21 +21,21 @@ 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, !1) var ignore = 0;
         console.log(a, b);
     }
-    expect_stdout: "100 6"
+    expect_stdout: true
 }
 
 issue_1639_2: {
     options = {
         booleans: true,
-        collapse_vars: true,
+        cascade: true,
         conditionals: true,
         evaluate: true,
         join_vars: true,
@@ -42,12 +44,14 @@ issue_1639_2: {
     }
     input: {
         var a = 100, b = 10;
+
         function f19() {
             if (++a, false)
                 if (a)
                     if (++a);
         }
         f19();
+
         console.log(a, b);
     }
     expect: {
@@ -58,13 +62,13 @@ issue_1639_2: {
         f19(),
         console.log(a, b);
     }
-    expect_stdout: "101 10"
+    expect_stdout: true
 }
 
 issue_1639_3: {
     options = {
         booleans: true,
-        collapse_vars: true,
+        cascade: true,
         conditionals: true,
         evaluate: true,
         sequences: true,
@@ -80,5 +84,5 @@ issue_1639_3: {
         a++,
         console.log(a, b);
     }
-    expect_stdout: "101 10"
+    expect_stdout: true
 }

test/compress/issue-1656.js

@@ -1,6 +1,7 @@
 f7: {
     options = {
         booleans: true,
+        cascade: true,
         collapse_vars: true,
         comparisons: true,
         conditionals: true,
@@ -14,7 +15,6 @@ f7: {
         negate_iife: true,
         passes: 3,
         properties: true,
-        reduce_funcs: true,
         reduce_vars: true,
         sequences: true,
         side_effects: true,
@@ -35,7 +35,11 @@ f7: {
         console.log(a, b);
     }
     expect_exact: [
-        "console.log(100, 100);",
+        "var b = 10;",
+        "",
+        "!function() {",
+        "    for (;b = 100, !1; ) ;",
+        "}(), console.log(100, b);",
     ]
-    expect_stdout: "100 100"
+    expect_stdout: true
 }

test/compress/issue-1673.js

@@ -1,6 +1,5 @@
 side_effects_catch: {
     options = {
-        reduce_funcs: true,
         reduce_vars: true,
         side_effects: true,
         unused: true,
@@ -35,7 +34,6 @@ side_effects_catch: {
 
 side_effects_else: {
     options = {
-        reduce_funcs: true,
         reduce_vars: true,
         side_effects: true,
         unused: true,
@@ -64,7 +62,6 @@ side_effects_else: {
 
 side_effects_finally: {
     options = {
-        reduce_funcs: true,
         reduce_vars: true,
         side_effects: true,
         unused: true,
@@ -101,7 +98,6 @@ side_effects_finally: {
 
 side_effects_label: {
     options = {
-        reduce_funcs: true,
         reduce_vars: true,
         side_effects: true,
         unused: true,
@@ -134,7 +130,6 @@ side_effects_label: {
 
 side_effects_switch: {
     options = {
-        reduce_funcs: true,
         reduce_vars: true,
         side_effects: true,
         unused: 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-1750.js

@@ -7,7 +7,7 @@ case_1: {
     input: {
         var a = 0, b = 1;
         switch (true) {
-          case a || true:
+          case a, true:
           default:
             b = 2;
           case true:
@@ -17,7 +17,7 @@ case_1: {
     expect: {
         var a = 0, b = 1;
         switch (true) {
-          case a || true:
+          case a, true:
             b = 2;
         }
         console.log(a, b);

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-1787.js

@@ -2,7 +2,6 @@ unary_prefix: {
     options = {
         evaluate: true,
         inline: true,
-        reduce_funcs: true,
         reduce_vars: true,
         unused: true,
     }

test/compress/issue-1833.js

@@ -1,7 +1,6 @@
 iife_for: {
     options = {
         negate_iife: true,
-        reduce_funcs: true,
         reduce_vars: true,
         toplevel: true,
         unused: true,
@@ -27,7 +26,6 @@ iife_for: {
 iife_for_in: {
     options = {
         negate_iife: true,
-        reduce_funcs: true,
         reduce_vars: true,
         toplevel: true,
         unused: true,
@@ -53,7 +51,6 @@ iife_for_in: {
 iife_do: {
     options = {
         negate_iife: true,
-        reduce_funcs: true,
         reduce_vars: true,
         toplevel: true,
         unused: true,
@@ -83,7 +80,6 @@ iife_do: {
 iife_while: {
     options = {
         negate_iife: true,
-        reduce_funcs: true,
         reduce_vars: true,
         toplevel: true,
         unused: true,
@@ -125,8 +121,8 @@ label_do: {
 
 label_while: {
     options = {
-        dead_code: true,
         evaluate: true,
+        dead_code: true,
         loops: true,
     }
     input: {
@@ -134,5 +130,5 @@ label_while: {
             L: while (0) continue L;
         }
     }
-    expect_exact: "function f(){L:0}"
+    expect_exact: "function f(){L:;}"
 }

test/compress/issue-2001.js

@@ -0,0 +1,281 @@
+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,
+    }
+    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,
+    }
+    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-2652.js

@@ -1,33 +0,0 @@
-insert_semicolon: {
-    beautify = {
-        beautify: true,
-        comments: "all",
-    }
-    input: {
-        var a
-        /* foo */ var b
-    }
-    expect_exact: [
-        "var a",
-        "/* foo */;",
-        "",
-        "var b;",
-    ]
-}
-
-unary_postfix: {
-    beautify = {
-        beautify: true,
-        comments: "all",
-    }
-    input: {
-        a
-        /* foo */++b
-    }
-    expect_exact: [
-        "a",
-        "/* foo */;",
-        "",
-        "++b;",
-    ]
-}

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

@@ -3,7 +3,6 @@ collapse_vars_constants: {
         collapse_vars: true,
         evaluate: true,
         inline: true,
-        reduce_funcs: true,
         reduce_vars: true,
         unused: true,
     }
@@ -186,7 +185,7 @@ negate_iife_5_off: {
         inline: true,
         negate_iife: false,
         sequences: true,
-    }
+    };
     input: {
         if ((function(){ return t })()) {
             foo(true);
@@ -241,11 +240,10 @@ negate_iife_issue_1073: {
         evaluate: true,
         inline: true,
         negate_iife: true,
-        reduce_funcs: true,
         reduce_vars: true,
         sequences: true,
         unused: true,
-    }
+    };
     input: {
         new (function(a) {
             return function Foo() {
@@ -269,11 +267,10 @@ issue_1288_side_effects: {
         evaluate: true,
         inline: true,
         negate_iife: true,
-        reduce_funcs: true,
         reduce_vars: true,
         side_effects: true,
         unused: true,
-    }
+    };
     input: {
         if (w) ;
         else {
@@ -302,7 +299,6 @@ inner_var_for_in_1: {
     options = {
         evaluate: true,
         inline: true,
-        reduce_funcs: true,
         reduce_vars: true,
     }
     input: {
@@ -334,7 +330,6 @@ issue_1595_3: {
         evaluate: true,
         inline: true,
         passes: 2,
-        reduce_funcs: true,
         reduce_vars: true,
         unused: true,
     }
@@ -399,7 +394,7 @@ wrap_iife_in_expression: {
         wrap_iife: true,
     }
     input: {
-        foo = (function() {
+        foo = (function () {
             return bar();
         })();
     }
@@ -453,7 +448,7 @@ pure_annotation_2: {
 
 drop_fargs: {
     options = {
-        collapse_vars: true,
+        cascade: true,
         inline: true,
         keep_fargs: false,
         side_effects: true,
@@ -476,7 +471,7 @@ drop_fargs: {
 
 keep_fargs: {
     options = {
-        collapse_vars: true,
+        cascade: true,
         inline: true,
         keep_fargs: true,
         side_effects: true,

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-368.js

@@ -1,6 +1,6 @@
 collapse: {
     options = {
-        collapse_vars: true,
+        cascade: true,
         sequences: true,
         side_effects: true,
         unused: true,
@@ -41,7 +41,7 @@ collapse: {
             return void 0 !== ('function' === typeof b ? b() : b) && c();
         }
         function f2(b) {
-            return 'stirng' == typeof ('function' === typeof (b = c()) ? b() : b) && d();
+            return b = c(), 'stirng' == typeof ('function' === typeof b ? b() : b) && d();
         }
         function f3(c) {
             var a;

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++) {}