v3.4.0

fixes #2443

.github/ISSUE_TEMPLATE.md

@@ -1,11 +1,7 @@
-**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**
@@ -24,6 +20,6 @@
 **JavaScript output or error produced.**
 
 <!--
-    Note: `uglify-js` only supports ES5. 
-    Those wishing to minify ES6 should use `uglify-es`.
+    Note: `uglify-js` only supports JavaScript.
+    Those wishing to minify ES6+ should transpile first.
 -->

CONTRIBUTING.md

@@ -0,0 +1,61 @@
+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 2012-2013 (c) Mihai Bazon <mihai.bazon@gmail.com>
+Copyright 2012-2018 (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

@@ -1,11 +1,13 @@
-uglify-es
-=========
+UglifyJS 3
+==========
 
-A JavaScript parser, mangler/compressor and beautifier toolkit for ES6+.
+UglifyJS is a JavaScript parser, minifier, compressor and beautifier toolkit.
 
 #### Note:
-- **`uglify-es` is API/CLI compatible with `uglify-js@3`.**
-- **`uglify-es` is not backwards compatible with `uglify-js@2`.**
+- **`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/UglifyJS2/tree/v2.x)**.
+- **Documentation for UglifyJS `2.x` releases can be found [here](https://github.com/mishoo/UglifyJS2/tree/v2.x)**.
+- `uglify-js` only supports JavaScript (ECMAScript 5).
+- To minify ECMAScript 2015 or above, transpile using tools like [Babel](https://babeljs.io/).
 
 Install
 -------
@@ -15,11 +17,11 @@ 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-es -g
+    npm install uglify-js -g
 
 From NPM for programmatic use:
 
-    npm install uglify-es
+    npm install uglify-js
 
 # Command line usage
 
@@ -67,7 +69,7 @@ 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 properies.
+                                `keep_quoted`  Only mangle unquoted properties.
                                 `regex`  Only mangle matched property names.
                                 `reserved`  List of names that should not be mangled.
     -b, --beautify [options]    Beautify output/specify output options:
@@ -102,20 +104,15 @@ 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.
-    --ecma <version>            Specify ECMAScript release: 5, 6, 7 or 8.
+    -e, --enclose [arg[:value]] Embed everything in a big function, with configurable
+                                argument(s) & value(s).
     --ie8                       Support non-standard Internet Explorer 8.
                                 Equivalent to setting `ie8: true` in `minify()`
                                 for `compress`, `mangle` and `output` options.
                                 By default UglifyJS will not try to be IE-proof.
-    --keep-classnames           Do not mangle/drop class names.
     --keep-fnames               Do not mangle/drop function names.  Useful for
                                 code relying on Function.prototype.name.
     --name-cache <file>         File to hold mangled name mappings.
-    --safari10                  Support non-standard Safari 10/11.
-                                Equivalent to setting `safari10: true` in `minify()`
-                                for `mangle` and `output` options.
-                                By default `uglify-es` will not work around
-                                Safari 10/11 bugs.
     --self                      Build UglifyJS as a library (implies --wrap UglifyJS)
     --source-map [options]      Enable source map/specify source map options:
                                 `base`  Path to compute relative paths from input files.
@@ -123,7 +120,8 @@ 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`  Name and/or location of the output source.
+                                `filename`  Filename and/or location of the output source
+                                            (sets `file` attribute in source map).
                                 `includeSources`  Pass this flag if you want to include
                                                   the content of source files in the
                                                   source map as sourcesContent property.
@@ -154,7 +152,9 @@ debugging your compressed JavaScript.  To get a source map, pass
 
 Additional options:
 
-- `--source-map "filename='<NAME>'"` to specify the name of the source map.
+- `--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 "root='<URL>'"` to pass the URL where the original files can be found.
 
@@ -349,7 +349,7 @@ identify mistakes like writing mangled keys to storage.
 Assuming installation via NPM, you can load UglifyJS in your application
 like this:
 ```javascript
-var UglifyJS = require("uglify-es");
+var UglifyJS = require("uglify-js");
 ```
 
 There is a single high level function, **`minify(code, options)`**,
@@ -478,9 +478,6 @@ 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.
 
@@ -515,17 +512,8 @@ if (result.error) throw result.error;
 
 - `ie8` (default `false`) - set to `true` to support IE8.
 
-- `keep_classnames` (default: `undefined`) - pass `true` to prevent discarding or mangling
-  of class names.
-
 - `keep_fnames` (default: `false`) - pass `true` to prevent discarding or mangling
-  of function names.  Useful for code relying on `Function.prototype.name`. If the
-  top level minify option `keep_classnames` is `undefined` it will be overriden with
-  the value of the top level minify option `keep_fnames`.
-
-- `safari10` (default: `false`) - pass `true` to work around Safari 10/11 bugs in
-  loop scoping and `await`. See `safari10` options in [`mangle`](#mangle-options)
-  and [`output`](#output-options) for details.
+  of function names.  Useful for code relying on `Function.prototype.name`.
 
 ## Minify options structure
 
@@ -550,13 +538,9 @@ if (result.error) throw result.error;
     sourceMap: {
         // source map options
     },
-    ecma: 5, // specify one of: 5, 6, 7 or 8
-    keep_classnames: false,
-    keep_fnames: false,
-    ie8: false,
     nameCache: null, // or specify a name cache object
-    safari10: false,
     toplevel: false,
+    ie8: false,
     warnings: false,
 }
 ```
@@ -612,36 +596,24 @@ If you're using the `X-SourceMap` header instead, you can just omit `sourceMap.u
 
 - `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
 
-- `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.
+- `arguments` (default: `true`) -- replace `arguments[index]` with function
+  parameter name whenever possible.
 
 - `booleans` (default: `true`) -- various optimizations for boolean context,
   for example `!!a ? b : c → a ? b : c`
 
-- `cascade` (default: `true`) -- small optimization for sequences, transform
-  `x, x` into `x` and `x = something(), x` into `x = something()`
-
 - `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` (only when `unsafe_comps`), attempts to negate binary
-  nodes, e.g. `a = !b && !c && !d && !e → a=!(b||c||d||e)` etc.
-
-- `computed_props` (default: `true`) -- Transforms constant computed properties
-  into regular ones: `{["computed"]: 1}` is converted to `{computed: 1}`.
+  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
@@ -655,9 +627,6 @@ If you're using the `X-SourceMap` header instead, you can just omit `sourceMap.u
 
 - `drop_debugger` (default: `true`) -- remove `debugger;` statements
 
-- `ecma` (default: `5`) -- Pass `6` or greater to enable `compress` options that
-  will transform ES5 code into smaller ES6+ equivalent forms.
-
 - `evaluate` (default: `true`) -- attempt to evaluate constant expressions
 
 - `expression` (default: `false`) -- Pass `true` to preserve completion values
@@ -665,7 +634,7 @@ If you're using the `X-SourceMap` header instead, you can just omit `sourceMap.u
 
 - `global_defs` (default: `{}`) -- see [conditional compilation](#conditional-compilation)
 
-- `hoist_funs` (default: `true`) -- hoist function declarations
+- `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:
@@ -678,14 +647,16 @@ If you're using the `X-SourceMap` header instead, you can just omit `sourceMap.u
 
 - `if_return` (default: `true`) -- optimizations for if/return and if/continue
 
-- `inline` (default: `true`) -- embed simple functions
+- `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_classnames` (default: `false`) -- Pass `true` to prevent the
-  compressor from discarding class names.  See also: the `keep_classnames`
-  [mangle option](#mangle).
-
 - `keep_fargs` (default: `true`) -- Prevents the compressor from discarding unused
   function arguments.  You need this for code which relies on `Function.length`.
 
@@ -719,7 +690,8 @@ If you're using the `X-SourceMap` header instead, you can just omit `sourceMap.u
   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).
+  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
@@ -766,38 +738,25 @@ If you're using the `X-SourceMap` header instead, you can just omit `sourceMap.u
 
 - `unsafe` (default: `false`) -- apply "unsafe" transformations (discussion below)
 
-- `unsafe_arrows` (default: `false`) -- Convert ES5 style anonymous function
-  expressions to arrow functions if the function body does not reference `this`.
-  Note: it is not always safe to perform this conversion if code relies on the
-  the function having a `prototype`, which arrow functions lack.
-  This transform requires that the `ecma` compress option is set to `6` or greater.
+- `unsafe_comps` (default: `false`) -- compress expressions like `a <= b` assuming
+  none of the operands can be (coerced to) `NaN`.
 
-- `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)`
+- `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_methods` (default: false) -- Converts `{ m: function(){} }` to
-  `{ m(){} }`. `ecma` must be set to `6` or greater to enable this transform.
-  If `unsafe_methods` is a RegExp then key/value pairs with keys matching the
-  RegExp will be converted to concise methods.
-  Note: if enabled there is a risk of getting a "`<method name>` is not a
-  constructor" TypeError should any code try to `new` the former function.
-
 - `unsafe_proto` (default: `false`) -- optimize expressions like
   `Array.prototype.slice.call(a)` into `[].slice.call(a)`
 
 - `unsafe_regexp` (default: `false`) -- enable substitutions of variables with
   `RegExp` values the same way as if they are constants.
 
+- `unsafe_undefined` (default: `false`) -- substitute `void 0` if there is a
+  variable named `undefined` in scope (variable name will be mangled, typically
+  reduced to a single character)
+
 - `unused` (default: `true`) -- drop unreferenced functions and variables (simple
   direct variable assignments do not count as references unless set to `"keep_assign"`)
 
@@ -809,9 +768,6 @@ If you're using the `X-SourceMap` header instead, you can just omit `sourceMap.u
 - `eval` (default `false`) -- Pass `true` to mangle names visible in scopes
   where `eval` or `with` are used.
 
-- `keep_classnames` (default `false`) -- Pass `true` to not mangle class names.
-  See also: the `keep_classnames` [compress option](#compress-options).
-
 - `keep_fnames` (default `false`) -- Pass `true` to not mangle function names.
   Useful for code relying on `Function.prototype.name`. See also: the `keep_fnames`
   [compress option](#compress-options).
@@ -822,11 +778,6 @@ If you're using the `X-SourceMap` header instead, you can just omit `sourceMap.u
 - `toplevel` (default `false`) -- Pass `true` to mangle names declared in the
   top level scope.
 
-- `safari10` (default `false`) -- Pass `true` to work around the Safari 10 loop
-  iterator [bug](https://bugs.webkit.org/show_bug.cgi?id=171041)
-  "Cannot declare a let variable twice".
-  See also: the `safari10` [output option](#output-options).
-
 Examples:
 
 ```javascript
@@ -879,7 +830,7 @@ can pass additional arguments that control the code output:
   when you want to generate minified code, in order to specify additional
   arguments, so you can use `-b beautify=false` to override it.
 
-- `bracketize` (default `false`) -- always insert brackets in `if`, `for`,
+- `braces` (default `false`) -- always insert braces in `if`, `for`,
   `do`, `while` or `with` statements, even if their body is a single
   statement.
 
@@ -887,19 +838,12 @@ can pass additional arguments that control the code output:
   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
+- `inline_script` (default `true`) -- escape HTML comments and 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.
@@ -925,10 +869,6 @@ can pass additional arguments that control the code output:
   - `2` -- always use double quotes
   - `3` -- always use the original quotes
 
-- `safari10` (default `false`) -- set this option to `true` to work around
-  the [Safari 10/11 await bug](https://bugs.webkit.org/show_bug.cgi?id=176685).
-  See also: the `safari10` [mangle option](#mangle-options).
-
 - `semicolons` (default `true`) -- separate statements with semicolons.  If
   you pass `false` then whenever possible we will use a newline instead of a
   semicolon, leading to more readable output of uglified code (size before
@@ -990,9 +930,6 @@ 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
 
@@ -1109,8 +1046,9 @@ var result = UglifyJS.minify(ast, {
 ### Working with Uglify AST
 
 Transversal and transformation of the native AST can be performed through
-[`TreeWalker`](http://lisperator.net/uglifyjs/walk) and
-[`TreeTransformer`](http://lisperator.net/uglifyjs/transform) respectively.
+[`TreeWalker`](https://github.com/mishoo/UglifyJS2/blob/master/lib/ast.js) and
+[`TreeTransformer`](https://github.com/mishoo/UglifyJS2/blob/master/lib/transform.js)
+respectively.
 
 ### ESTree / SpiderMonkey AST
 
@@ -1169,3 +1107,27 @@ To enable fast minify mode with the API use:
 ```js
 UglifyJS.minify(code, { compress: false, mangle: true });
 ```
+
+#### Source maps and debugging
+
+Various `compress` transforms that simplify, rearrange, inline and remove code
+are known to have an adverse effect on debugging with source maps. This is
+expected as code is optimized and mappings are often simply not possible as
+some code no longer exists. For highest fidelity in source map debugging
+disable the Uglify `compress` option and just use `mangle`.
+
+### Compiler assumptions
+
+To allow for better optimizations, the compiler makes various assumptions:
+
+- `.toString()` and `.valueOf()` don't have side effects, and for built-in
+  objects they have not been overridden.
+- `undefined`, `NaN` and `Infinity` have not been externally redefined.
+- `arguments.callee`, `arguments.caller` and `Function.prototype.caller` are not used.
+- The code doesn't expect the contents of `Function.prototype.toString()` or
+  `Error.prototype.stack` to be anything in particular.
+- Getting and setting properties on a plain object does not cause other side effects
+  (using `.watch()` or `Proxy`).
+- Object properties can be added, removed and modified (not prevented with
+  `Object.defineProperty()`, `Object.defineProperties()`, `Object.freeze()`,
+  `Object.preventExtensions()` or `Object.seal()`).

appveyor.yml

@@ -1,24 +1,20 @@
 environment:
   matrix:
-  - nodejs_version: "0.10"
-  - nodejs_version: "0.12"
-  - nodejs_version: "4.0"
-  - nodejs_version: "6.0"
-
+    - nodejs_version: "0.10"
+    - nodejs_version: "0.12"
+    - nodejs_version: "4"
+    - nodejs_version: "6"
+    - nodejs_version: "8"
+install:
+  - ps: Install-Product node $env:nodejs_version
+  - set UGLIFYJS_TEST_ALL=1
+  - npm install
+build: off
+cache:
+  - tmp
 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

@@ -3,11 +3,7 @@
 
 "use strict";
 
-// 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);
-});
+require("../tools/exit");
 
 var fs = require("fs");
 var info = require("../package.json");
@@ -15,7 +11,7 @@ var path = require("path");
 var program = require("commander");
 var UglifyJS = require("../tools/node");
 
-var skip_keys = [ "cname", "enclosed", "inlined", "parent_scope", "scope", "thedef", "uses_eval", "uses_with" ];
+var skip_keys = [ "cname", "inlined", "parent_scope", "scope", "uses_eval", "uses_with" ];
 var files = {};
 var options = {
     compress: false,
@@ -44,16 +40,15 @@ program.option("-o, --output <file>", "Output file (default STDOUT).");
 program.option("--comments [filter]", "Preserve copyright comments in the output.");
 program.option("--config-file <file>", "Read minify() options from JSON file.");
 program.option("-d, --define <expr>[=value]", "Global definitions.", parse_js("define"));
-program.option("--ecma <version>", "Specify ECMAScript release: 5, 6, 7 or 8.");
+program.option("-e, --enclose [arg[,...][:value[,...]]]", "Embed everything in a big function, with configurable argument(s) & value(s).");
 program.option("--ie8", "Support non-standard Internet Explorer 8.");
-program.option("--keep-classnames", "Do not mangle/drop class names.");
 program.option("--keep-fnames", "Do not mangle/drop function names. Useful for code relying on Function.prototype.name.");
 program.option("--name-cache <file>", "File to hold mangled name mappings.");
+program.option("--rename", "Force symbol expansion.");
 program.option("--no-rename", "Disable symbol expansion.");
-program.option("--safari10", "Support non-standard Safari 10.");
 program.option("--self", "Build UglifyJS as a library (implies --wrap UglifyJS)");
-program.option("--source-map [options]", "Enable source map/specify source map options.", parse_source_map());
-program.option("--timings", "Display operations run time on STDERR.")
+program.option("--source-map [options]", "Enable source map/specify source map options.", parse_js());
+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.");
@@ -67,23 +62,17 @@ if (!program.output && program.sourceMap && program.sourceMap.url != "inline") {
 }
 [
     "compress",
+    "enclose",
     "ie8",
     "mangle",
-    "rename",
-    "safari10",
     "sourceMap",
     "toplevel",
     "wrap"
 ].forEach(function(name) {
     if (name in program) {
-        if (name == "rename" && program[name]) return;
         options[name] = program[name];
     }
 });
-if ("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)) {
@@ -101,9 +90,6 @@ if (program.define) {
         options.compress.global_defs[expr] = program.define[expr];
     }
 }
-if (program.keepClassnames) {
-    options.keep_classnames = true;
-}
 if (program.keepFnames) {
     options.keep_fnames = true;
 }
@@ -136,6 +122,11 @@ if (program.parse) {
         fatal("ERROR: inline source map only works with built-in parser");
     }
 }
+if (~program.rawArgs.indexOf("--rename")) {
+    options.rename = true;
+} else if (!program.rename) {
+    options.rename = false;
+}
 var convert_path = function(name) {
     return name;
 };
@@ -187,6 +178,11 @@ function run() {
     UglifyJS.AST_Node.warn_function = function(msg) {
         print_error("WARN: " + msg);
     };
+    var content = program.sourceMap && program.sourceMap.content;
+    if (content && content != "inline") {
+        print_error("INFO: Using input source map: " + content);
+        options.sourceMap.content = read_file(content, content);
+    }
     if (program.timings) options.timings = true;
     try {
         if (program.parse) {
@@ -238,7 +234,20 @@ function run() {
         }
         fatal(ex);
     } else if (program.output == "ast") {
+        if (!options.compress && !options.mangle) {
+            result.ast.figure_out_scope({});
+        }
         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;
@@ -375,23 +384,16 @@ function parse_js(flag) {
     }
 }
 
-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;
-    }
-}
-
 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/ast.js

@@ -87,7 +87,7 @@ function DEFNODE(type, props, methods, base) {
     return ctor;
 };
 
-var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw", {
+var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before comments_after file raw", {
 }, null);
 
 var AST_Node = DEFNODE("Node", "start end", {
@@ -156,7 +156,7 @@ var AST_SimpleStatement = DEFNODE("SimpleStatement", "body", {
 
 function walk_body(node, visitor) {
     var body = node.body;
-    if (body instanceof AST_Node) {
+    if (body instanceof AST_Statement) {
         body._walk(visitor);
     }
     else for (var i = 0, len = body.length; i < len; i++) {
@@ -165,7 +165,7 @@ function walk_body(node, visitor) {
 };
 
 var AST_Block = DEFNODE("Block", "body", {
-    $documentation: "A body of statements (usually bracketed)",
+    $documentation: "A body of statements (usually braced)",
     $propdoc: {
         body: "[AST_Statement*] an array of statements"
     },
@@ -267,11 +267,10 @@ var AST_For = DEFNODE("For", "init condition step", {
     }
 }, AST_IterationStatement);
 
-var AST_ForIn = DEFNODE("ForIn", "init name object", {
+var AST_ForIn = DEFNODE("ForIn", "init object", {
     $documentation: "A `for ... in` statement",
     $propdoc: {
         init: "[AST_Node] the `for/in` initialization code",
-        name: "[AST_SymbolRef?] the loop variable, only if `init` is AST_Var",
         object: "[AST_Node] the object that we're looping through"
     },
     _walk: function(visitor) {
@@ -283,10 +282,6 @@ var AST_ForIn = DEFNODE("ForIn", "init name object", {
     }
 }, AST_IterationStatement);
 
-var AST_ForOf = DEFNODE("ForOf", null, {
-    $documentation: "A `for ... of` statement",
-}, AST_ForIn);
-
 var AST_With = DEFNODE("With", "expression", {
     $documentation: "A `with` statement",
     $propdoc: {
@@ -313,12 +308,15 @@ var AST_Scope = DEFNODE("Scope", "variables functions uses_with uses_eval parent
         enclosed: "[SymbolDef*/S] a list of all symbol definitions that are accessed from this scope or any subscopes",
         cname: "[integer/S] current index for mangling variables (used internally by the mangler)",
     },
-    get_defun_scope: function() {
-        var self = this;
-        while (self.is_block_scope()) {
-            self = self.parent_scope;
-        }
-        return self;
+    clone: function(deep) {
+        var node = this._clone(deep);
+        if (this.variables) node.variables = this.variables.clone();
+        if (this.functions) node.functions = this.functions.clone();
+        if (this.enclosed) node.enclosed = this.enclosed.slice();
+        return node;
+    },
+    pinned: function() {
+        return this.uses_eval || this.uses_with;
     }
 }, AST_Block);
 
@@ -337,41 +335,32 @@ var AST_Toplevel = DEFNODE("Toplevel", "globals", {
             }
         }));
         return wrapped_tl;
+    },
+    wrap_enclose: function(args_values) {
+        if (typeof args_values != "string") args_values = "";
+        var index = args_values.indexOf(":");
+        if (index < 0) index = args_values.length;
+        var body = this.body;
+        return parse([
+            "(function(",
+            args_values.slice(0, index),
+            '){"$ORIG"})(',
+            args_values.slice(index + 1),
+            ")"
+        ].join("")).transform(new TreeTransformer(function(node) {
+            if (node instanceof AST_Directive && node.value == "$ORIG") {
+                return MAP.splice(body);
+            }
+        }));
     }
 }, AST_Scope);
 
-var AST_Expansion = DEFNODE("Expansion", "expression", {
-    $documentation: "An expandible argument, such as ...rest, a splat, such as [1,2,...all], or an expansion in a variable declaration, such as var [first, ...rest] = list",
-    $propdoc: {
-        expression: "[AST_Node] the thing to be expanded"
-    },
-    _walk: function(visitor) {
-        var self = this;
-        return visitor._visit(this, function(){
-            self.expression.walk(visitor);
-        });
-    }
-});
-
-var AST_Lambda = DEFNODE("Lambda", "name argnames uses_arguments is_generator async", {
+var AST_Lambda = DEFNODE("Lambda", "name argnames uses_arguments", {
     $documentation: "Base class for functions",
     $propdoc: {
         name: "[AST_SymbolDeclaration?] the name of this function",
-        argnames: "[AST_SymbolFunarg|AST_Destructuring|AST_Expansion|AST_DefaultAssign*] array of function arguments, destructurings, or expanding arguments",
-        uses_arguments: "[boolean/S] tells whether this function accesses the arguments array",
-        is_generator: "[boolean] is this a generator method",
-        async: "[boolean] is this method async",
-    },
-    args_as_names: function () {
-        var out = [];
-        for (var i = 0; i < this.argnames.length; i++) {
-            if (this.argnames[i] instanceof AST_Destructuring) {
-                out = out.concat(this.argnames[i].all_symbols());
-            } else {
-                out.push(this.argnames[i]);
-            }
-        }
-        return out;
+        argnames: "[AST_SymbolFunarg*] array of function arguments",
+        uses_arguments: "[boolean/S] tells whether this function accesses the arguments array"
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
@@ -393,76 +382,10 @@ var AST_Function = DEFNODE("Function", "inlined", {
     $documentation: "A function expression"
 }, AST_Lambda);
 
-var AST_Arrow = DEFNODE("Arrow", "inlined", {
-    $documentation: "An ES6 Arrow function ((a) => b)"
-}, AST_Lambda);
-
 var AST_Defun = DEFNODE("Defun", "inlined", {
     $documentation: "A function definition"
 }, AST_Lambda);
 
-/* -----[ DESTRUCTURING ]----- */
-var AST_Destructuring = DEFNODE("Destructuring", "names is_array", {
-    $documentation: "A destructuring of several names. Used in destructuring assignment and with destructuring function argument names",
-    $propdoc: {
-        "names": "[AST_Node*] Array of properties or elements",
-        "is_array": "[Boolean] Whether the destructuring represents an object or array"
-    },
-    _walk: function(visitor) {
-        return visitor._visit(this, function(){
-            this.names.forEach(function(name){
-                name._walk(visitor);
-            });
-        });
-    },
-    all_symbols: function() {
-        var out = [];
-        this.walk(new TreeWalker(function (node) {
-            if (node instanceof AST_Symbol) {
-                out.push(node);
-            }
-            if (node instanceof AST_Expansion) {
-                out.push(node.expression);
-            }
-        }));
-        return out;
-    }
-});
-
-var AST_PrefixedTemplateString = DEFNODE("PrefixedTemplateString", "template_string prefix", {
-    $documentation: "A templatestring with a prefix, such as String.raw`foobarbaz`",
-    $propdoc: {
-        template_string: "[AST_TemplateString] The template string",
-        prefix: "[AST_SymbolRef|AST_PropAccess] The prefix, which can be a symbol such as `foo` or a dotted expression such as `String.raw`."
-    },
-    _walk: function(visitor) {
-        this.prefix._walk(visitor);
-        this.template_string._walk(visitor);
-    }
-})
-
-var AST_TemplateString = DEFNODE("TemplateString", "segments", {
-    $documentation: "A template string literal",
-    $propdoc: {
-        segments: "[AST_Node*] One or more segments, starting with AST_TemplateSegment. AST_Node may follow AST_TemplateSegment, but each AST_Node must be followed by AST_TemplateSegment."
-    },
-    _walk: function(visitor) {
-        return visitor._visit(this, function(){
-            this.segments.forEach(function(seg){
-                seg._walk(visitor);
-            });
-        });
-    }
-});
-
-var AST_TemplateSegment = DEFNODE("TemplateSegment", "value raw", {
-    $documentation: "A segment of a template string literal",
-    $propdoc: {
-        value: "Content of the segment",
-        raw: "Raw content of the segment"
-    }
-});
-
 /* -----[ JUMPS ]----- */
 
 var AST_Jump = DEFNODE("Jump", null, {
@@ -582,7 +505,7 @@ var AST_Try = DEFNODE("Try", "bcatch bfinally", {
 var AST_Catch = DEFNODE("Catch", "argname", {
     $documentation: "A `catch` node; only makes sense as part of a `try` statement",
     $propdoc: {
-        argname: "[AST_SymbolCatch|AST_Destructuring|AST_Expansion|AST_DefaultAssign] symbol for the exception"
+        argname: "[AST_SymbolCatch] symbol for the exception"
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
@@ -596,10 +519,10 @@ var AST_Finally = DEFNODE("Finally", null, {
     $documentation: "A `finally` node; only makes sense as part of a `try` statement"
 }, AST_Block);
 
-/* -----[ VAR/CONST ]----- */
+/* -----[ VAR ]----- */
 
 var AST_Definitions = DEFNODE("Definitions", "definitions", {
-    $documentation: "Base class for `var` or `const` nodes (variable declarations/initializations)",
+    $documentation: "Base class for `var` nodes (variable declarations/initializations)",
     $propdoc: {
         definitions: "[AST_VarDef*] array of variable definitions"
     },
@@ -617,83 +540,10 @@ var AST_Var = DEFNODE("Var", null, {
     $documentation: "A `var` statement"
 }, AST_Definitions);
 
-var AST_Let = DEFNODE("Let", null, {
-    $documentation: "A `let` statement"
-}, AST_Definitions);
-
-var AST_Const = DEFNODE("Const", null, {
-    $documentation: "A `const` statement"
-}, AST_Definitions);
-
-var AST_NameMapping = DEFNODE("NameMapping", "foreign_name name", {
-    $documentation: "The part of the export/import statement that declare names from a module.",
-    $propdoc: {
-        foreign_name: "[AST_SymbolExportForeign|AST_SymbolImportForeign] The name being exported/imported (as specified in the module)",
-        name: "[AST_SymbolExport|AST_SymbolImport] The name as it is visible to this module."
-    },
-    _walk: function (visitor) {
-        return visitor._visit(this, function() {
-            this.foreign_name._walk(visitor);
-            this.name._walk(visitor);
-        });
-    }
-})
-
-var AST_Import = DEFNODE("Import", "imported_name imported_names module_name", {
-    $documentation: "An `import` statement",
-    $propdoc: {
-        imported_name: "[AST_SymbolImport] The name of the variable holding the module's default export.",
-        imported_names: "[AST_NameMapping*] The names of non-default imported variables",
-        module_name: "[AST_String] String literal describing where this module came from",
-    },
-    _walk: function(visitor) {
-        return visitor._visit(this, function() {
-            if (this.imported_name) {
-                this.imported_name._walk(visitor);
-            }
-            if (this.imported_names) {
-                this.imported_names.forEach(function(name_import) {
-                    name_import._walk(visitor);
-                });
-            }
-            this.module_name._walk(visitor);
-        });
-    }
-});
-
-var AST_Export = DEFNODE("Export", "exported_definition exported_value is_default exported_names module_name", {
-    $documentation: "An `export` statement",
-    $propdoc: {
-        exported_definition: "[AST_Defun|AST_Definitions|AST_DefClass?] An exported definition",
-        exported_value: "[AST_Node?] An exported value",
-        exported_names: "[AST_NameMapping*?] List of exported names",
-        module_name: "[AST_String?] Name of the file to load exports from",
-        is_default: "[Boolean] Whether this is the default exported value of this module"
-    },
-    _walk: function (visitor) {
-        visitor._visit(this, function () {
-            if (this.exported_definition) {
-                this.exported_definition._walk(visitor);
-            }
-            if (this.exported_value) {
-                this.exported_value._walk(visitor);
-            }
-            if (this.exported_names) {
-                this.exported_names.forEach(function(name_export) {
-                    name_export._walk(visitor);
-                });
-            }
-            if (this.module_name) {
-                this.module_name._walk(visitor);
-            }
-        });
-    }
-}, AST_Statement);
-
 var AST_VarDef = DEFNODE("VarDef", "name value", {
     $documentation: "A variable declaration; only appears in a AST_Definitions node",
     $propdoc: {
-        name: "[AST_Destructuring|AST_SymbolConst|AST_SymbolLet|AST_SymbolVar] name of the variable",
+        name: "[AST_SymbolVar] name of the variable",
         value: "[AST_Node?] initializer, or null of there's no initializer"
     },
     _walk: function(visitor) {
@@ -713,12 +563,11 @@ var AST_Call = DEFNODE("Call", "expression args", {
         args: "[AST_Node*] array of arguments"
     },
     _walk: function(visitor) {
-        return visitor._visit(this, function(){
-            var args = this.args;
-            for (var i = 0, len = args.length; i < len; i++) {
-                args[i]._walk(visitor);
-            }
+        return visitor._visit(this, function() {
             this.expression._walk(visitor);
+            this.args.forEach(function(node) {
+                node._walk(visitor);
+            });
         });
     }
 });
@@ -824,10 +673,6 @@ var AST_Assign = DEFNODE("Assign", null, {
     $documentation: "An assignment expression — `a = b + 5`",
 }, AST_Binary);
 
-var AST_DefaultAssign = DEFNODE("DefaultAssign", null, {
-    $documentation: "A default assignment expression like in `(a = 3) => a`"
-}, AST_Binary);
-
 /* -----[ LITERALS ]----- */
 
 var AST_Array = DEFNODE("Array", "elements", {
@@ -863,13 +708,11 @@ var AST_Object = DEFNODE("Object", "properties", {
 var AST_ObjectProperty = DEFNODE("ObjectProperty", "key value", {
     $documentation: "Base class for literal object properties",
     $propdoc: {
-        key: "[string|AST_Node] the property name converted to a string for ObjectKeyVal. For setters, getters and computed property this is an arbitrary AST_Node",
-        value: "[AST_Node] property value.  For setters and getters this is an AST_Accessor."
+        key: "[string|AST_SymbolAccessor] property name. For ObjectKeyVal this is a string. For getters and setters this is an AST_SymbolAccessor.",
+        value: "[AST_Node] property value.  For getters and setters this is an AST_Accessor."
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
-            if (this.key instanceof AST_Node)
-                this.key._walk(visitor);
             this.value._walk(visitor);
         });
     }
@@ -882,95 +725,35 @@ var AST_ObjectKeyVal = DEFNODE("ObjectKeyVal", "quote", {
     }
 }, AST_ObjectProperty);
 
-var AST_ObjectSetter = DEFNODE("ObjectSetter", "quote static", {
-    $propdoc: {
-        quote: "[string|undefined] the original quote character, if any",
-        static: "[boolean] whether this is a static setter (classes only)"
-    },
+var AST_ObjectSetter = DEFNODE("ObjectSetter", null, {
     $documentation: "An object setter property",
 }, AST_ObjectProperty);
 
-var AST_ObjectGetter = DEFNODE("ObjectGetter", "quote static", {
-    $propdoc: {
-        quote: "[string|undefined] the original quote character, if any",
-        static: "[boolean] whether this is a static getter (classes only)"
-    },
+var AST_ObjectGetter = DEFNODE("ObjectGetter", null, {
     $documentation: "An object getter property",
 }, AST_ObjectProperty);
 
-var AST_ConciseMethod = DEFNODE("ConciseMethod", "quote static is_generator async", {
-    $propdoc: {
-        quote: "[string|undefined] the original quote character, if any",
-        static: "[boolean] is this method static (classes only)",
-        is_generator: "[boolean] is this a generator method",
-        async: "[boolean] is this method async",
-    },
-    $documentation: "An ES6 concise method inside an object or class"
-}, AST_ObjectProperty);
-
-var AST_Class = DEFNODE("Class", "name extends properties inlined", {
-    $propdoc: {
-        name: "[AST_SymbolClass|AST_SymbolDefClass?] optional class name.",
-        extends: "[AST_Node]? optional parent class",
-        properties: "[AST_ObjectProperty*] array of properties"
-    },
-    $documentation: "An ES6 class",
-    _walk: function(visitor) {
-        return visitor._visit(this, function(){
-            if (this.name) {
-                this.name._walk(visitor);
-            }
-            if (this.extends) {
-                this.extends._walk(visitor);
-            }
-            this.properties.forEach(function(prop){
-                prop._walk(visitor);
-            });
-        });
-    },
-}, AST_Scope);
-
-var AST_DefClass = DEFNODE("DefClass", null, {
-    $documentation: "A class definition",
-}, AST_Class);
-
-var AST_ClassExpression = DEFNODE("ClassExpression", null, {
-    $documentation: "A class expression."
-}, AST_Class);
-
 var AST_Symbol = DEFNODE("Symbol", "scope name thedef", {
     $propdoc: {
         name: "[string] name of this symbol",
         scope: "[AST_Scope/S] the current scope (not necessarily the definition scope)",
         thedef: "[SymbolDef/S] the definition of this symbol"
     },
-    $documentation: "Base class for all symbols"
+    $documentation: "Base class for all symbols",
 });
 
-var AST_NewTarget = DEFNODE("NewTarget", null, {
-    $documentation: "A reference to new.target"
-});
+var AST_SymbolAccessor = DEFNODE("SymbolAccessor", null, {
+    $documentation: "The name of a property accessor (setter/getter function)"
+}, AST_Symbol);
 
 var AST_SymbolDeclaration = DEFNODE("SymbolDeclaration", "init", {
-    $documentation: "A declaration symbol (symbol in var/const, function name or argument, symbol in catch)",
+    $documentation: "A declaration symbol (symbol in var, function name or argument, symbol in catch)",
 }, AST_Symbol);
 
 var AST_SymbolVar = DEFNODE("SymbolVar", null, {
     $documentation: "Symbol defining a variable",
 }, AST_SymbolDeclaration);
 
-var AST_SymbolBlockDeclaration = DEFNODE("SymbolBlockDeclaration", null, {
-    $documentation: "Base class for block-scoped declaration symbols"
-}, AST_SymbolDeclaration);
-
-var AST_SymbolConst = DEFNODE("SymbolConst", null, {
-    $documentation: "A constant declaration"
-}, AST_SymbolBlockDeclaration);
-
-var AST_SymbolLet = DEFNODE("SymbolLet", null, {
-    $documentation: "A block-scoped `let` declaration"
-}, AST_SymbolBlockDeclaration);
-
 var AST_SymbolFunarg = DEFNODE("SymbolFunarg", null, {
     $documentation: "Symbol naming a function argument",
 }, AST_SymbolVar);
@@ -979,33 +762,13 @@ var AST_SymbolDefun = DEFNODE("SymbolDefun", null, {
     $documentation: "Symbol defining a function",
 }, AST_SymbolDeclaration);
 
-var AST_SymbolMethod = DEFNODE("SymbolMethod", null, {
-    $documentation: "Symbol in an object defining a method",
-}, AST_Symbol);
-
 var AST_SymbolLambda = DEFNODE("SymbolLambda", null, {
     $documentation: "Symbol naming a function expression",
 }, AST_SymbolDeclaration);
 
-var AST_SymbolDefClass = DEFNODE("SymbolDefClass", null, {
-    $documentation: "Symbol naming a class's name in a class declaration. Lexically scoped to its containing scope, and accessible within the class."
-}, AST_SymbolBlockDeclaration);
-
-var AST_SymbolClass = DEFNODE("SymbolClass", null, {
-    $documentation: "Symbol naming a class's name. Lexically scoped to the class."
-}, AST_SymbolDeclaration);
-
 var AST_SymbolCatch = DEFNODE("SymbolCatch", null, {
     $documentation: "Symbol naming the exception in catch",
-}, AST_SymbolBlockDeclaration);
-
-var AST_SymbolImport = DEFNODE("SymbolImport", null, {
-    $documentation: "Symbol referring to an imported name",
-}, AST_SymbolBlockDeclaration);
-
-var AST_SymbolImportForeign = DEFNODE("SymbolImportForeign", null, {
-    $documentation: "A symbol imported from a module, but it is defined in the other module, and its real name is irrelevant for this module's purposes",
-}, AST_Symbol);
+}, AST_SymbolDeclaration);
 
 var AST_Label = DEFNODE("Label", "references", {
     $documentation: "Symbol naming a label (declaration)",
@@ -1022,14 +785,6 @@ var AST_SymbolRef = DEFNODE("SymbolRef", null, {
     $documentation: "Reference to some symbol (not definition/declaration)",
 }, AST_Symbol);
 
-var AST_SymbolExport = DEFNODE("SymbolExport", null, {
-    $documentation: "Symbol referring to a name to export",
-}, AST_SymbolRef);
-
-var AST_SymbolExportForeign = DEFNODE("SymbolExportForeign", null, {
-    $documentation: "A symbol exported from this module, but it is used in the other module, and its real name is irrelevant for this module's purposes",
-}, AST_Symbol);
-
 var AST_LabelRef = DEFNODE("LabelRef", null, {
     $documentation: "Reference to a label symbol",
 }, AST_Symbol);
@@ -1038,10 +793,6 @@ var AST_This = DEFNODE("This", null, {
     $documentation: "The `this` symbol",
 }, AST_Symbol);
 
-var AST_Super = DEFNODE("Super", null, {
-    $documentation: "The `super` symbol",
-}, AST_This);
-
 var AST_Constant = DEFNODE("Constant", null, {
     $documentation: "Base class for all constants",
     getValue: function() {
@@ -1115,31 +866,6 @@ var AST_True = DEFNODE("True", null, {
     value: true
 }, AST_Boolean);
 
-var AST_Await = DEFNODE("Await", "expression", {
-    $documentation: "An `await` statement",
-    $propdoc: {
-        expression: "[AST_Node] the mandatory expression being awaited",
-    },
-    _walk: function(visitor) {
-        return visitor._visit(this, function(){
-            this.expression._walk(visitor);
-        });
-    }
-});
-
-var AST_Yield = DEFNODE("Yield", "expression is_star", {
-    $documentation: "A `yield` statement",
-    $propdoc: {
-        expression: "[AST_Node?] the value returned or thrown by this statement; could be null (representing undefined) but only when is_star is set to false",
-        is_star: "[Boolean] Whether this is a yield or yield* statement"
-    },
-    _walk: function(visitor) {
-        return visitor._visit(this, this.expression && function(){
-            this.expression._walk(visitor);
-        });
-    }
-});
-
 /* -----[ TreeWalker ]----- */
 
 function TreeWalker(callback) {
@@ -1167,17 +893,11 @@ TreeWalker.prototype = {
             this.directives = Object.create(this.directives);
         } else if (node instanceof AST_Directive && !this.directives[node.value]) {
             this.directives[node.value] = node;
-        } else if (node instanceof AST_Class) {
-            this.directives = Object.create(this.directives);
-            if (!this.directives["use strict"]) {
-                this.directives["use strict"] = node;
-            }
         }
         this.stack.push(node);
     },
     pop: function() {
-        var node = this.stack.pop();
-        if (node instanceof AST_Lambda || node instanceof AST_Class) {
+        if (this.stack.pop() instanceof AST_Lambda) {
             this.directives = Object.getPrototypeOf(this.directives);
         }
     },
@@ -1195,7 +915,7 @@ TreeWalker.prototype = {
         var dir = this.directives[type];
         if (dir) return dir;
         var node = this.stack[this.stack.length - 1];
-        if (node instanceof AST_Scope && node.body) {
+        if (node instanceof AST_Scope) {
             for (var i = 0; i < node.body.length; ++i) {
                 var st = node.body[i];
                 if (!(st instanceof AST_Directive)) break;
@@ -1215,5 +935,25 @@ TreeWalker.prototype = {
                 || node instanceof AST_Break && x instanceof AST_Switch)
                 return x;
         }
+    },
+    in_boolean_context: function() {
+        var self = this.self();
+        for (var i = 0, p; p = this.parent(i); i++) {
+            if (p instanceof AST_SimpleStatement
+                || p instanceof AST_Conditional && p.condition === self
+                || p instanceof AST_DWLoop && p.condition === self
+                || p instanceof AST_For && p.condition === self
+                || p instanceof AST_If && p.condition === self
+                || p instanceof AST_UnaryPrefix && p.operator == "!" && p.expression === self) {
+                return true;
+            }
+            if (p instanceof AST_Binary && (p.operator == "&&" || p.operator == "||")
+                || p instanceof AST_Conditional
+                || p.tail_node() === self) {
+                self = p;
+            } else {
+                return false;
+            }
+        }
     }
 };

lib/minify.js

@@ -7,15 +7,23 @@ var to_base64 = typeof btoa == "undefined" ? function(str) {
     return new Buffer(str).toString("base64");
 } : btoa;
 
-function read_source_map(code) {
+function read_source_map(name, code) {
     var match = /\n\/\/# sourceMappingURL=data:application\/json(;.*?)?;base64,(.*)/.exec(code);
     if (!match) {
-        AST_Node.warn("inline source map not found");
+        AST_Node.warn("inline source map not found: " + name);
         return null;
     }
     return to_ascii(match[2]);
 }
 
+function parse_source_map(content) {
+    try {
+        return JSON.parse(content);
+    } catch (ex) {
+        throw new Error("invalid input source map: " + content);
+    }
+}
+
 function set_shorthand(name, options, keys) {
     if (options[name]) {
         keys.forEach(function(key) {
@@ -29,7 +37,6 @@ 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)) {
@@ -39,7 +46,6 @@ function init_cache(cache) {
 
 function to_json(cache) {
     return {
-        cname: cache.cname,
         props: cache.props.toObject()
     };
 }
@@ -49,16 +55,14 @@ function minify(files, options) {
     try {
         options = defaults(options, {
             compress: {},
-            ecma: undefined,
+            enclose: false,
             ie8: false,
-            keep_classnames: undefined,
             keep_fnames: false,
             mangle: {},
             nameCache: null,
             output: {},
             parse: {},
             rename: undefined,
-            safari10: false,
             sourceMap: false,
             timings: false,
             toplevel: false,
@@ -68,17 +72,11 @@ function minify(files, options) {
         var timings = options.timings && {
             start: Date.now()
         };
-        if (options.keep_classnames === undefined) {
-            options.keep_classnames = options.keep_fnames;
-        }
         if (options.rename === undefined) {
             options.rename = options.compress && options.mangle;
         }
-        set_shorthand("ecma", options, [ "parse", "compress", "output" ]);
         set_shorthand("ie8", options, [ "compress", "mangle", "output" ]);
-        set_shorthand("keep_classnames", options, [ "compress", "mangle" ]);
         set_shorthand("keep_fnames", options, [ "compress", "mangle" ]);
-        set_shorthand("safari10", options, [ "mangle", "output" ]);
         set_shorthand("toplevel", options, [ "compress", "mangle" ]);
         set_shorthand("warnings", options, [ "compress" ]);
         var quoted_props;
@@ -87,11 +85,9 @@ function minify(files, options) {
                 cache: options.nameCache && (options.nameCache.vars || {}),
                 eval: false,
                 ie8: false,
-                keep_classnames: false,
                 keep_fnames: false,
                 properties: false,
                 reserved: [],
-                safari10: false,
                 toplevel: false,
             }, true);
             if (options.mangle.properties) {
@@ -126,7 +122,7 @@ function minify(files, options) {
             };
         }
         if (timings) timings.parse = Date.now();
-        var toplevel;
+        var source_maps, toplevel;
         if (files instanceof AST_Toplevel) {
             toplevel = files;
         } else {
@@ -135,13 +131,23 @@ 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);
+            }
+            source_maps = source_map_content && Object.create(null);
             for (var name in files) if (HOP(files, name)) {
                 options.parse.filename = name;
                 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]);
+                if (source_maps) {
+                    if (source_map_content == "inline") {
+                        var inlined_content = read_source_map(name, files[name]);
+                        if (inlined_content) {
+                            source_maps[name] = parse_source_map(inlined_content);
+                        }
+                    } else {
+                        source_maps[name] = source_map_content;
+                    }
                 }
             }
             toplevel = options.parse.toplevel;
@@ -152,6 +158,9 @@ function minify(files, options) {
         if (options.wrap) {
             toplevel = toplevel.wrap_commonjs(options.wrap);
         }
+        if (options.enclose) {
+            toplevel = toplevel.wrap_enclose(options.enclose);
+        }
         if (timings) timings.rename = Date.now();
         if (options.rename) {
             toplevel.figure_out_scope(options.mangle);
@@ -163,7 +172,6 @@ function minify(files, options) {
         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);
         }
@@ -178,12 +186,9 @@ function minify(files, options) {
         }
         if (!HOP(options.output, "code") || options.output.code) {
             if (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,
+                    orig: source_maps,
                     root: options.sourceMap.root
                 });
                 if (options.sourceMap.includeSources) {
@@ -192,6 +197,8 @@ function minify(files, options) {
                     } else for (var name in files) if (HOP(files, name)) {
                         options.output.source_map.get().setSourceContent(name, files[name]);
                     }
+                } else {
+                    options.output.source_map.get()._sourcesContents = null;
                 }
             }
             delete options.output.ast;

lib/mozilla-ast.js

@@ -118,7 +118,7 @@
                 value    : from_moz(M.value)
             };
             if (M.kind == "init") return new AST_ObjectKeyVal(args);
-            args.key = new AST_SymbolMethod({
+            args.key = new AST_SymbolAccessor({
                 name: args.key
             });
             args.value = new AST_Accessor(args.value);
@@ -168,7 +168,7 @@
             });
         },
         VariableDeclaration: function(M) {
-            return new (M.kind === "const" ? AST_Const : AST_Var)({
+            return new AST_Var({
                 start       : my_start_token(M),
                 end         : my_end_token(M),
                 definitions : M.declarations.map(from_moz)
@@ -180,6 +180,17 @@
                 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;
@@ -189,22 +200,12 @@
                 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 ? (p.kind == "const" ? AST_SymbolConst : AST_SymbolVar)
+                        : p.type == "VariableDeclarator" && p.id === M ? 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
@@ -324,7 +325,7 @@
     def_to_moz(AST_Definitions, function To_Moz_VariableDeclaration(M) {
         return {
             type: "VariableDeclaration",
-            kind: M instanceof AST_Const ? "const" : "var",
+            kind: "var",
             declarations: M.definitions.map(to_moz)
         };
     });
@@ -381,7 +382,7 @@
     def_to_moz(AST_ObjectProperty, function To_Moz_Property(M) {
         var key = {
             type: "Literal",
-            value: M.key instanceof AST_SymbolMethod ? M.key.name : M.key
+            value: M.key instanceof AST_SymbolAccessor ? M.key.name : M.key
         };
         var kind;
         if (M instanceof AST_ObjectKeyVal) {
@@ -410,14 +411,15 @@
     });
 
     def_to_moz(AST_RegExp, function To_Moz_RegExpLiteral(M) {
-        var value = M.value;
+        var flags = M.value.toString().match(/[gimuy]*$/)[0];
+        var value = "/" + M.value.raw_source + "/" + flags;
         return {
             type: "Literal",
             value: value,
-            raw: value.toString(),
+            raw: value,
             regex: {
-                pattern: value.source,
-                flags: value.toString().match(/[gimuy]*$/)[0]
+                pattern: M.value.raw_source,
+                flags: flags
             }
         };
     });
@@ -564,6 +566,21 @@
         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;
     };
 

lib/propmangle.js

@@ -44,16 +44,6 @@
 "use strict";
 
 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",
@@ -65,15 +55,7 @@ function find_builtins(reserved) {
     ].forEach(add);
     [ 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
+      Date, RegExp
     ].forEach(function(ctor){
         Object.getOwnPropertyNames(ctor).map(add);
         if (ctor.prototype) {
@@ -93,8 +75,6 @@ function reserve_quoted_keys(ast, reserved) {
     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);
         }
@@ -130,12 +110,15 @@ function mangle_properties(ast, options) {
     if (!Array.isArray(reserved)) reserved = [];
     if (!options.builtins) find_builtins(reserved);
 
-    var cache = options.cache;
-    if (cache == null) {
-        cache = {
-            cname: -1,
-            props: new Dictionary()
-        };
+    var cname = -1;
+    var cache;
+    if (options.cache) {
+        cache = options.cache.props;
+        cache.each(function(mangled_name) {
+            push_uniq(reserved, mangled_name);
+        });
+    } else {
+        cache = new Dictionary();
     }
 
     var regex = options.regex;
@@ -167,6 +150,10 @@ function mangle_properties(ast, options) {
         else if (node instanceof AST_Sub) {
             addStrings(node.property, add);
         }
+        else if (node instanceof AST_Call
+            && node.expression.print_to_string() == "Object.defineProperty") {
+            addStrings(node.args[1], add);
+        }
     }));
 
     // step 2: transform the tree, renaming properties
@@ -184,6 +171,10 @@ function mangle_properties(ast, options) {
         else if (!options.keep_quoted && node instanceof AST_Sub) {
             node.property = mangleStrings(node.property);
         }
+        else if (node instanceof AST_Call
+            && node.expression.print_to_string() == "Object.defineProperty") {
+            node.args[1] = mangleStrings(node.args[1]);
+        }
     }));
 
     // only function declarations after this line
@@ -192,7 +183,7 @@ function mangle_properties(ast, options) {
         if (unmangleable.indexOf(name) >= 0) return false;
         if (reserved.indexOf(name) >= 0) return false;
         if (options.only_cache) {
-            return cache.props.has(name);
+            return cache.has(name);
         }
         if (/^-?[0-9]+(\.[0-9]+)?(e[+-][0-9]+)?$/.test(name)) return false;
         return true;
@@ -201,7 +192,7 @@ function mangle_properties(ast, options) {
     function should_mangle(name) {
         if (regex && !regex.test(name)) return false;
         if (reserved.indexOf(name) >= 0) return false;
-        return cache.props.has(name)
+        return cache.has(name)
             || names_to_mangle.indexOf(name) >= 0;
     }
 
@@ -219,7 +210,7 @@ function mangle_properties(ast, options) {
             return name;
         }
 
-        var mangled = cache.props.get(name);
+        var mangled = cache.get(name);
         if (!mangled) {
             if (debug) {
                 // debug mode: use a prefix and suffix to preserve readability, e.g. o.foo -> o._$foo$NNN_.
@@ -233,11 +224,11 @@ function mangle_properties(ast, options) {
             // either debug mode is off, or it is on and we could not use the mangled name
             if (!mangled) {
                 do {
-                    mangled = base54(++cache.cname);
+                    mangled = base54(++cname);
                 } while (!can_mangle(mangled));
             }
 
-            cache.props.set(name, mangled);
+            cache.set(name, mangled);
         }
         return mangled;
     }

lib/scope.js

@@ -43,19 +43,19 @@
 
 "use strict";
 
-function SymbolDef(scope, orig) {
+function SymbolDef(scope, orig, init) {
     this.name = orig.name;
     this.orig = [ orig ];
+    this.init = init;
     this.eliminated = 0;
     this.scope = scope;
     this.references = [];
     this.replaced = 0;
     this.global = false;
-    this.export = false;
     this.mangled_name = null;
     this.undeclared = false;
     this.id = SymbolDef.next_id++;
-};
+}
 
 SymbolDef.next_id = 1;
 
@@ -63,33 +63,24 @@ SymbolDef.prototype = {
     unmangleable: function(options) {
         if (!options) options = {};
 
-        return (this.global && !options.toplevel)
-            || this.export
+        return this.global && !options.toplevel
             || this.undeclared
-            || (!options.eval && (this.scope.uses_eval || this.scope.uses_with))
-            || (options.keep_fnames
+            || !options.eval && this.scope.pinned()
+            || options.keep_fnames
                 && (this.orig[0] instanceof AST_SymbolLambda
-                    || this.orig[0] instanceof AST_SymbolDefun))
-            || this.orig[0] instanceof AST_SymbolMethod
-            || (options.keep_classnames
-                && (this.orig[0] instanceof AST_SymbolClass
-                    || this.orig[0] instanceof AST_SymbolDefClass));
+                    || this.orig[0] instanceof AST_SymbolDefun);
     },
     mangle: function(options) {
         var cache = options.cache && options.cache.props;
         if (this.global && cache && cache.has(this.name)) {
             this.mangled_name = cache.get(this.name);
-        }
-        else if (!this.mangled_name && !this.unmangleable(options)) {
-            var s = this.scope;
-            var sym = this.orig[0];
-            if (options.ie8 && sym instanceof AST_SymbolLambda)
-                s = s.parent_scope;
+        } else if (!this.mangled_name && !this.unmangleable(options)) {
             var def;
             if (def = this.redefined()) {
                 this.mangled_name = def.mangled_name || def.name;
-            } else
-                this.mangled_name = s.next_mangled(options, this);
+            } else {
+                this.mangled_name = next_mangled_name(this.scope, options, this);
+            }
             if (this.global && cache) {
                 cache.set(this.name, this.mangled_name);
             }
@@ -104,64 +95,31 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
     options = defaults(options, {
         cache: null,
         ie8: false,
-        safari10: false,
     });
 
     // pass 1: setup scope chaining and handle definitions
     var self = this;
     var scope = self.parent_scope = null;
-    var labels = new Dictionary();
     var defun = null;
-    var in_destructuring = null;
-    var for_scopes = [];
     var tw = new TreeWalker(function(node, descend){
-        if (node.is_block_scope()) {
+        if (node instanceof AST_Catch) {
             var save_scope = scope;
-            node.block_scope = scope = new AST_Scope(node);
+            scope = new AST_Scope(node);
             scope.init_scope_vars(save_scope);
-            if (!(node instanceof AST_Scope)) {
-                scope.uses_with = save_scope.uses_with;
-                scope.uses_eval = save_scope.uses_eval;
-                scope.directives = save_scope.directives;
-            }
-            if (options.safari10) {
-                if (node instanceof AST_For || node instanceof AST_ForIn) {
-                    for_scopes.push(scope);
-                }
-            }
             descend();
             scope = save_scope;
             return true;
         }
-        if (node instanceof AST_Destructuring) {
-            in_destructuring = node;  // These don't nest
-            descend();
-            in_destructuring = null;
-            return true;
-        }
         if (node instanceof AST_Scope) {
             node.init_scope_vars(scope);
             var save_scope = scope;
             var save_defun = defun;
-            var save_labels = labels;
             defun = scope = node;
-            labels = new Dictionary();
             descend();
             scope = save_scope;
             defun = save_defun;
-            labels = save_labels;
             return true;        // don't descend again in TreeWalker
         }
-        if (node instanceof AST_LabeledStatement) {
-            var l = node.label;
-            if (labels.has(l.name)) {
-                throw new Error(string_template("Label {name} defined twice", l));
-            }
-            labels.set(l.name, l);
-            descend();
-            labels.del(l.name);
-            return true;        // no descend again
-        }
         if (node instanceof AST_With) {
             for (var s = scope; s; s = s.parent_scope)
                 s.uses_with = true;
@@ -175,7 +133,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
             node.references = [];
         }
         if (node instanceof AST_SymbolLambda) {
-            defun.def_function(node);
+            defun.def_function(node, node.name == "arguments" ? undefined : defun);
         }
         else if (node instanceof AST_SymbolDefun) {
             // Careful here, the scope where this should be defined is
@@ -183,81 +141,22 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
             // scope when we encounter the AST_Defun node (which is
             // instanceof AST_Scope) but we get to the symbol a bit
             // later.
-            mark_export((node.scope = defun.parent_scope.get_defun_scope()).def_function(node), 1);
+            (node.scope = defun.parent_scope).def_function(node, defun);
         }
-        else if (node instanceof AST_SymbolClass) {
-            mark_export(defun.def_variable(node), 1);
-        }
-        else if (node instanceof AST_SymbolImport) {
-            scope.def_variable(node);
-        }
-        else if (node instanceof AST_SymbolDefClass) {
-            // This deals with the name of the class being available
-            // inside the class.
-            mark_export((node.scope = defun.parent_scope).def_function(node), 1);
-        }
-        else if (node instanceof AST_SymbolVar
-            || node instanceof AST_SymbolLet
-            || node instanceof AST_SymbolConst) {
-            var def = ((node instanceof AST_SymbolBlockDeclaration) ? scope : defun).def_variable(node);
-            if (!all(def.orig, function(sym) {
-                if (sym === node) return true;
-                if (node instanceof AST_SymbolBlockDeclaration) {
-                    return sym instanceof AST_SymbolLambda;
-                }
-                return !(sym instanceof AST_SymbolLet || sym instanceof AST_SymbolConst);
-            })) {
-                js_error(
-                    node.name + " redeclared",
-                    node.start.file,
-                    node.start.line,
-                    node.start.col,
-                    node.start.pos
-                );
-            }
-            if (!(node instanceof AST_SymbolFunarg)) mark_export(def, 2);
-            def.destructuring = in_destructuring;
+        else if (node instanceof AST_SymbolVar) {
+            defun.def_variable(node, node.TYPE == "SymbolVar" ? null : undefined);
             if (defun !== scope) {
                 node.mark_enclosed(options);
                 var def = scope.find_variable(node);
                 if (node.thedef !== def) {
                     node.thedef = def;
-                    node.reference(options);
                 }
+                node.reference(options);
             }
         }
         else if (node instanceof AST_SymbolCatch) {
             scope.def_variable(node).defun = defun;
         }
-        else if (node instanceof AST_LabelRef) {
-            var sym = labels.get(node.name);
-            if (!sym) throw new Error(string_template("Undefined label {name} [{line},{col}]", {
-                name: node.name,
-                line: node.start.line,
-                col: node.start.col
-            }));
-            node.thedef = sym;
-        }
-        if (!(scope instanceof AST_Toplevel) && (node instanceof AST_Export || node instanceof AST_Import)) {
-            js_error(
-                node.TYPE + " statement may only appear at top level",
-                node.start.file,
-                node.start.line,
-                node.start.col,
-                node.start.pos
-            );
-        }
-
-        function mark_export(def, level) {
-            if (in_destructuring) {
-                var i = 0;
-                do {
-                    level++;
-                } while (tw.parent(i++) !== in_destructuring);
-            }
-            var node = tw.parent(level);
-            def.export = node instanceof AST_Export;
-        }
     });
     self.walk(tw);
 
@@ -275,9 +174,8 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
                     s.uses_eval = true;
                 }
             }
-            var sym;
-            if (tw.parent() instanceof AST_NameMapping && tw.parent(1).module_name
-                || !(sym = node.scope.find_variable(name))) {
+            var sym = node.scope.find_variable(name);
+            if (!sym) {
                 sym = self.def_global(node);
             } else if (sym.scope instanceof AST_Lambda && name == "arguments") {
                 sym.scope.uses_arguments = true;
@@ -317,23 +215,6 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
             }
         }));
     }
-
-    // pass 4: add symbol definitions to loop scopes
-    // Safari/Webkit bug workaround - loop init let variable shadowing argument.
-    // https://github.com/mishoo/UglifyJS2/issues/1753
-    // https://bugs.webkit.org/show_bug.cgi?id=171041
-    if (options.safari10) {
-        for (var i = 0; i < for_scopes.length; i++) {
-            var scope = for_scopes[i];
-            scope.parent_scope.variables.each(function(def) {
-                push_uniq(scope.enclosed, def);
-            });
-        }
-    }
-
-    if (options.cache) {
-        this.cname = options.cache.cname;
-    }
 });
 
 AST_Toplevel.DEFMETHOD("def_global", function(node){
@@ -359,14 +240,6 @@ AST_Scope.DEFMETHOD("init_scope_vars", function(parent_scope){
     this.cname = -1;                    // the current index for mangling functions/variables
 });
 
-AST_Node.DEFMETHOD("is_block_scope", return_false);
-AST_Class.DEFMETHOD("is_block_scope", return_false);
-AST_Lambda.DEFMETHOD("is_block_scope", return_false);
-AST_Toplevel.DEFMETHOD("is_block_scope", return_false);
-AST_SwitchBranch.DEFMETHOD("is_block_scope", return_false);
-AST_Block.DEFMETHOD("is_block_scope", return_true);
-AST_IterationStatement.DEFMETHOD("is_block_scope", return_true);
-
 AST_Lambda.DEFMETHOD("init_scope_vars", function(){
     AST_Scope.prototype.init_scope_vars.apply(this, arguments);
     this.uses_arguments = false;
@@ -403,65 +276,86 @@ AST_Scope.DEFMETHOD("find_variable", function(name){
         || (this.parent_scope && this.parent_scope.find_variable(name));
 });
 
-AST_Scope.DEFMETHOD("def_function", function(symbol){
-    var def = this.def_variable(symbol);
+AST_Scope.DEFMETHOD("def_function", function(symbol, init){
+    var def = this.def_variable(symbol, init);
+    if (!def.init || def.init instanceof AST_Defun) def.init = init;
     this.functions.set(symbol.name, def);
     return def;
 });
 
-AST_Scope.DEFMETHOD("def_variable", function(symbol){
-    var def;
-    if (!this.variables.has(symbol.name)) {
-        def = new SymbolDef(this, symbol);
+AST_Scope.DEFMETHOD("def_variable", function(symbol, init){
+    var def = this.variables.get(symbol.name);
+    if (def) {
+        def.orig.push(symbol);
+        if (def.init && (def.scope !== symbol.scope || def.init instanceof AST_Function)) {
+            def.init = init;
+        }
+    } else {
+        def = new SymbolDef(this, symbol, init);
         this.variables.set(symbol.name, def);
         def.global = !this.parent_scope;
-    } else {
-        def = this.variables.get(symbol.name);
-        def.orig.push(symbol);
     }
     return symbol.thedef = def;
 });
 
-AST_Scope.DEFMETHOD("next_mangled", function(options){
-    var ext = this.enclosed;
-    out: while (true) {
-        var m = base54(++this.cname);
-        if (!is_identifier(m)) continue; // skip over "do"
-
-        // https://github.com/mishoo/UglifyJS2/issues/242 -- do not
-        // shadow a name reserved from mangling.
-        if (member(m, options.reserved)) continue;
-
-        // we must ensure that the mangled name does not shadow a name
-        // from some parent scope that is referenced in this or in
-        // inner scopes.
-        for (var i = ext.length; --i >= 0;) {
-            var sym = ext[i];
-            var name = sym.mangled_name || (sym.unmangleable(options) && sym.name);
-            if (m == name) continue out;
-        }
-        return m;
+function names_in_use(scope, options) {
+    var names = scope.names_in_use;
+    if (!names) {
+        scope.names_in_use = names = Object.create(scope.mangled_names || null);
+        scope.cname_holes = [];
+        scope.enclosed.forEach(function(def) {
+            if (def.unmangleable(options)) names[def.name] = true;
+        });
     }
-});
+    return names;
+}
 
-AST_Function.DEFMETHOD("next_mangled", function(options, def){
+function next_mangled_name(scope, options, def) {
+    var in_use = names_in_use(scope, options);
+    var holes = scope.cname_holes;
+    var names = Object.create(null);
     // #179, #326
     // in Safari strict mode, something like (function x(x){...}) is a syntax error;
     // a function expression's argument cannot shadow the function expression's name
-
-    var tricky_def = def.orig[0] instanceof AST_SymbolFunarg && this.name && this.name.definition();
-
-    // the function's mangled_name is null when keep_fnames is true
-    var tricky_name = tricky_def ? tricky_def.mangled_name || tricky_def.name : null;
-
-    while (true) {
-        var name = AST_Lambda.prototype.next_mangled.call(this, options, def);
-        if (!tricky_name || tricky_name != name)
-            return name;
+    if (scope instanceof AST_Function && scope.name && def.orig[0] instanceof AST_SymbolFunarg) {
+        var tricky_def = scope.name.definition();
+        // the function's mangled_name is null when keep_fnames is true
+        names[tricky_def.mangled_name || tricky_def.name] = true;
     }
-});
+    var scopes = [ scope ];
+    def.references.forEach(function(sym) {
+        var scope = sym.scope;
+        do {
+            if (scopes.indexOf(scope) < 0) {
+                for (var name in names_in_use(scope, options)) {
+                    names[name] = true;
+                }
+                scopes.push(scope);
+            } else break;
+        } while (scope = scope.parent_scope);
+    });
+    var name;
+    for (var i = 0, len = holes.length; i < len; i++) {
+        name = base54(holes[i]);
+        if (names[name]) continue;
+        holes.splice(i, 1);
+        scope.names_in_use[name] = true;
+        return name;
+    }
+    while (true) {
+        name = base54(++scope.cname);
+        if (in_use[name] || !is_identifier(name) || options.reserved.has[name]) continue;
+        if (!names[name]) break;
+        holes.push(scope.cname);
+    }
+    scope.names_in_use[name] = true;
+    if (options.ie8 && def.orig[0] instanceof AST_SymbolLambda) {
+        names_in_use(scope.parent_scope, options)[name] = true;
+    }
+    return name;
+}
 
-AST_Symbol.DEFMETHOD("unmangleable", function(options){
+AST_Symbol.DEFMETHOD("unmangleable", function(options) {
     var def = this.definition();
     return !def || def.unmangleable(options);
 });
@@ -469,24 +363,22 @@ AST_Symbol.DEFMETHOD("unmangleable", function(options){
 // labels are always mangleable
 AST_Label.DEFMETHOD("unmangleable", return_false);
 
-AST_Symbol.DEFMETHOD("unreferenced", function(){
-    return this.definition().references.length == 0
-        && !(this.scope.uses_eval || this.scope.uses_with);
+AST_Symbol.DEFMETHOD("unreferenced", function() {
+    return !this.definition().references.length && !this.scope.pinned();
 });
 
-AST_Symbol.DEFMETHOD("definition", function(){
+AST_Symbol.DEFMETHOD("definition", function() {
     return this.thedef;
 });
 
-AST_Symbol.DEFMETHOD("global", function(){
+AST_Symbol.DEFMETHOD("global", function() {
     return this.definition().global;
 });
 
-AST_Toplevel.DEFMETHOD("_default_mangler_options", function(options) {
+function _default_mangler_options(options) {
     options = defaults(options, {
         eval        : false,
         ie8         : false,
-        keep_classnames: false,
         keep_fnames : false,
         reserved    : [],
         toplevel    : false,
@@ -494,23 +386,27 @@ AST_Toplevel.DEFMETHOD("_default_mangler_options", function(options) {
     if (!Array.isArray(options.reserved)) options.reserved = [];
     // Never mangle arguments
     push_uniq(options.reserved, "arguments");
+    options.reserved.has = makePredicate(options.reserved);
     return options;
-});
+}
 
 AST_Toplevel.DEFMETHOD("mangle_names", function(options){
-    options = this._default_mangler_options(options);
+    options = _default_mangler_options(options);
 
     // We only need to mangle declaration nodes.  Special logic wired
     // into the code generator will display the mangled name if it's
     // present (and for AST_SymbolRef-s it'll use the mangled name of
     // the AST_SymbolDeclaration that it points to).
     var lname = -1;
-    var to_mangle = [];
 
-    if (options.cache) {
-        this.globals.each(collect);
+    if (options.cache && options.cache.props) {
+        var mangled_names = this.mangled_names = Object.create(null);
+        options.cache.props.each(function(mangled_name) {
+            mangled_names[mangled_name] = true;
+        });
     }
 
+    var redefined = [];
     var tw = new TreeWalker(function(node, descend){
         if (node instanceof AST_LabeledStatement) {
             // lname is incremented when we get to the AST_Label
@@ -520,8 +416,12 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options){
             return true;        // don't descend again in TreeWalker
         }
         if (node instanceof AST_Scope) {
-            node.variables.each(collect);
-            return;
+            descend();
+            if (options.cache && node instanceof AST_Toplevel) {
+                node.globals.each(mangle);
+            }
+            node.variables.each(mangle);
+            return true;
         }
         if (node instanceof AST_Label) {
             var name;
@@ -529,83 +429,83 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options){
             node.mangled_name = name;
             return true;
         }
-        var mangle_with_block_scope =
-            (!options.ie8 && node instanceof AST_SymbolCatch) ||
-            node instanceof AST_SymbolBlockDeclaration;
-        if (mangle_with_block_scope && options.reserved.indexOf(node.name) < 0) {
-            to_mangle.push(node.definition());
-            return;
+        if (!options.ie8 && node instanceof AST_Catch) {
+            var def = node.argname.definition();
+            var redef = def.redefined();
+            if (redef) {
+                redefined.push(def);
+                reference(node.argname);
+                def.references.forEach(reference);
+            }
+            descend();
+            if (!redef) mangle(def);
+            return true;
+        }
+
+        function reference(sym) {
+            sym.thedef = redef;
+            sym.reference(options);
+            sym.thedef = def;
         }
     });
     this.walk(tw);
-    to_mangle.forEach(function(def){
+    redefined.forEach(mangle);
+
+    function mangle(def) {
+        if (options.reserved.has[def.name]) return;
         def.mangle(options);
-    });
-
-    if (options.cache) {
-        options.cache.cname = this.cname;
-    }
-
-    function collect(symbol) {
-        if (!member(symbol.name, options.reserved)) {
-            to_mangle.push(symbol);
-        }
     }
 });
 
-AST_Toplevel.DEFMETHOD("find_unique_prefix", function(options) {
-    var letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_";
+AST_Toplevel.DEFMETHOD("find_colliding_names", function(options) {
     var cache = options.cache && options.cache.props;
-    var prefixes = Object.create(null);
-    options.reserved.forEach(add_prefix);
+    var avoid = Object.create(null);
+    options.reserved.forEach(to_avoid);
     this.globals.each(add_def);
     this.walk(new TreeWalker(function(node) {
         if (node instanceof AST_Scope) node.variables.each(add_def);
         if (node instanceof AST_SymbolCatch) add_def(node.definition());
     }));
-    var prefix, i = 0;
-    do {
-        prefix = create_name(i++);
-    } while (prefixes[prefix]);
-    return prefix;
+    return avoid;
 
-    function add_prefix(name) {
-        if (/[0-9]$/.test(name)) {
-            prefixes[name.replace(/[0-9]+$/, "")] = true;
-        }
+    function to_avoid(name) {
+        avoid[name] = true;
     }
 
     function add_def(def) {
         var name = def.name;
         if (def.global && cache && cache.has(name)) name = cache.get(name);
         else if (!def.unmangleable(options)) return;
-        add_prefix(name);
-    }
-
-    function create_name(num) {
-        var name = "";
-        do {
-            name += letters[num % letters.length];
-            num = Math.floor(num / letters.length);
-        } while (num);
-        return name;
+        to_avoid(name);
     }
 });
 
 AST_Toplevel.DEFMETHOD("expand_names", function(options) {
-    options = this._default_mangler_options(options);
-    var prefix = this.find_unique_prefix(options);
+    base54.reset();
+    base54.sort();
+    options = _default_mangler_options(options);
+    var avoid = this.find_colliding_names(options);
+    var cname = 0;
     this.globals.each(rename);
     this.walk(new TreeWalker(function(node) {
         if (node instanceof AST_Scope) node.variables.each(rename);
         if (node instanceof AST_SymbolCatch) rename(node.definition());
     }));
 
+    function next_name() {
+        var name;
+        do {
+            name = base54(cname++);
+        } while (avoid[name] || !is_identifier(name));
+        return name;
+    }
+
     function rename(def) {
-        if (def.global || def.unmangleable(options)) return;
-        if (member(def.name, options.reserved)) return;
+        if (def.global && options.cache) return;
+        if (def.unmangleable(options)) return;
+        if (options.reserved.has[def.name]) return;
         var d = def.redefined();
-        def.name = d ? d.name : prefix + def.id;
+        def.name = d ? d.name : next_name();
         def.orig.forEach(function(sym) {
             sym.name = def.name;
         });
@@ -621,7 +521,8 @@ AST_Sequence.DEFMETHOD("tail_node", function() {
 });
 
 AST_Toplevel.DEFMETHOD("compute_char_frequency", function(options){
-    options = this._default_mangler_options(options);
+    options = _default_mangler_options(options);
+    base54.reset();
     try {
         AST_Node.prototype.print = function(stream, force_parens) {
             this._print(stream, force_parens);
@@ -654,17 +555,21 @@ AST_Toplevel.DEFMETHOD("compute_char_frequency", function(options){
 });
 
 var base54 = (function() {
-    var leading = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_".split("");
-    var digits = "0123456789".split("");
+    var freq = Object.create(null);
+    function init(chars) {
+        var array = [];
+        for (var i = 0, len = chars.length; i < len; i++) {
+            var ch = chars[i];
+            array.push(ch);
+            freq[ch] = -1e-2 * i;
+        }
+        return array;
+    }
+    var digits = init("0123456789");
+    var leading = init("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_");
     var chars, frequency;
     function reset() {
-        frequency = Object.create(null);
-        leading.forEach(function(ch) {
-            frequency[ch] = 0;
-        });
-        digits.forEach(function(ch) {
-            frequency[ch] = 0;
-        });
+        frequency = Object.create(freq);
     }
     base54.consider = function(str, delta) {
         for (var i = str.length; --i >= 0;) {
@@ -675,7 +580,7 @@ var base54 = (function() {
         return frequency[b] - frequency[a];
     }
     base54.sort = function() {
-        chars = mergeSort(leading, compare).concat(mergeSort(digits, compare));
+        chars = leading.sort(compare).concat(digits.sort(compare));
     };
     base54.reset = reset;
     reset();
@@ -689,6 +594,6 @@ var base54 = (function() {
             base = 64;
         } while (num > 0);
         return ret;
-    };
+    }
     return base54;
 })();

lib/sourcemap.js

@@ -57,26 +57,26 @@ function SourceMap(options) {
         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);
-            }
-        });
+    var maps = options.orig && Object.create(null);
+    if (maps) for (var source in options.orig) {
+        var map = new MOZ_SourceMap.SourceMapConsumer(options.orig[source]);
+        if (Array.isArray(options.orig[source].sources)) {
+            map._sources.toArray().forEach(function(source) {
+                var sourceContent = map.sourceContentFor(source, true);
+                if (sourceContent) generator.setSourceContent(source, sourceContent);
+            });
+        }
+        maps[source] = map;
     }
 
     function add(source, gen_line, gen_col, orig_line, orig_col, name) {
-        if (orig_map) {
-            var info = orig_map.originalPositionFor({
+        var map = maps && maps[source];
+        if (map) {
+            var info = map.originalPositionFor({
                 line: orig_line,
                 column: orig_col
             });
-            if (info.source === null) {
-                return;
-            }
+            if (info.source === null) return;
             source = info.source;
             orig_line = info.line;
             orig_col = info.column;

lib/transform.js

@@ -60,12 +60,9 @@ TreeTransformer.prototype = new TreeWalker;
             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);
+                x = this;
+                descend(x, tw);
+                if (tw.after) {
                     y = tw.after(x, in_list);
                     if (y !== undefined) x = y;
                 }
@@ -96,7 +93,12 @@ TreeTransformer.prototype = new TreeWalker;
         self.body = do_list(self.body, tw);
     });
 
-    _(AST_DWLoop, function(self, tw){
+    _(AST_Do, function(self, tw){
+        self.body = self.body.transform(tw);
+        self.condition = self.condition.transform(tw);
+    });
+
+    _(AST_While, function(self, tw){
         self.condition = self.condition.transform(tw);
         self.body = self.body.transform(tw);
     });
@@ -163,18 +165,10 @@ TreeTransformer.prototype = new TreeWalker;
         if (self.value) self.value = self.value.transform(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);
-        if (self.body instanceof AST_Node) {
-            self.body = self.body.transform(tw);
-        } else {
-            self.body = do_list(self.body, tw);
-        }
+        self.body = do_list(self.body, tw);
     });
 
     _(AST_Call, function(self, tw){
@@ -195,14 +189,6 @@ TreeTransformer.prototype = new TreeWalker;
         self.property = self.property.transform(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);
-    });
-
     _(AST_Unary, function(self, tw){
         self.expression = self.expression.transform(tw);
     });
@@ -227,46 +213,7 @@ TreeTransformer.prototype = new TreeWalker;
     });
 
     _(AST_ObjectProperty, function(self, tw){
-        if (self.key instanceof AST_Node) {
-            self.key = self.key.transform(tw);
-        }
         self.value = self.value.transform(tw);
     });
 
-    _(AST_Class, function(self, tw){
-        if (self.name) self.name = self.name.transform(tw);
-        if (self.extends) self.extends = self.extends.transform(tw);
-        self.properties = do_list(self.properties, tw);
-    });
-
-    _(AST_Expansion, function(self, tw){
-        self.expression = self.expression.transform(tw);
-    });
-
-    _(AST_NameMapping, function(self, tw) {
-        self.foreign_name = self.foreign_name.transform(tw);
-        self.name = self.name.transform(tw);
-    });
-
-    _(AST_Import, function(self, tw) {
-        if (self.imported_name) self.imported_name = self.imported_name.transform(tw);
-        if (self.imported_names) do_list(self.imported_names, tw);
-        self.module_name = self.module_name.transform(tw);
-    });
-
-    _(AST_Export, function(self, tw) {
-        if (self.exported_definition) self.exported_definition = self.exported_definition.transform(tw);
-        if (self.exported_value) self.exported_value = self.exported_value.transform(tw);
-        if (self.exported_names) do_list(self.exported_names, tw);
-        if (self.module_name) self.module_name = self.module_name.transform(tw);
-    });
-
-    _(AST_TemplateString, function(self, tw) {
-        self.segments = do_list(self.segments, tw);
-    });
-
-    _(AST_PrefixedTemplateString, function(self, tw) {
-        self.template_string = self.template_string.transform(tw);
-    });
-
 })();

lib/utils.js

@@ -43,33 +43,27 @@
 
 "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 = 0, n = array.length; i < n; ++i) {
-        if (func(array[i]))
-            return array[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;
-    if (i & 1) d += str;
-    return d;
-};
+    return i & 1 ? d + str : d;
+}
 
 function configure_error_stack(fn) {
     Object.defineProperty(fn.prototype, "stack", {
@@ -88,27 +82,23 @@ 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 (args === true)
-        args = {};
+    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);
+    if (croak) for (var i in ret) if (HOP(ret, i) && !HOP(defs, i)) {
+        throw new DefaultsError("`" + 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];
     }
     return ret;
-};
+}
 
 function merge(obj, ext) {
     var count = 0;
@@ -117,7 +107,7 @@ function merge(obj, ext) {
         count++;
     }
     return count;
-};
+}
 
 function noop() {}
 function return_false() { return false; }
@@ -149,7 +139,7 @@ var MAP = (function(){
             }
             return is_last;
         };
-        if (a instanceof Array) {
+        if (Array.isArray(a)) {
             if (backwards) {
                 for (i = a.length; --i >= 0;) if (doit()) break;
                 ret.reverse();
@@ -176,113 +166,40 @@ var MAP = (function(){
 function push_uniq(array, el) {
     if (array.indexOf(el) < 0)
         array.push(el);
-};
+}
 
 function string_template(text, props) {
     return text.replace(/\{(.+?)\}/g, function(str, p){
         return props && props[p];
     });
-};
+}
 
 function remove(array, el) {
     for (var i = array.length; --i >= 0;) {
         if (array[i] === el) array.splice(i, 1);
     }
-};
+}
 
-function mergeSort(array, cmp) {
-    if (array.length < 2) return array.slice();
-    function merge(a, b) {
-        var r = [], ai = 0, bi = 0, i = 0;
-        while (ai < a.length && bi < b.length) {
-            cmp(a[ai], b[bi]) <= 0
-                ? r[i++] = a[ai++]
-                : r[i++] = b[bi++];
-        }
-        if (ai < a.length) r.push.apply(r, a.slice(ai));
-        if (bi < b.length) r.push.apply(r, b.slice(bi));
-        return r;
-    };
-    function _ms(a) {
-        if (a.length <= 1)
-            return a;
-        var m = Math.floor(a.length / 2), left = a.slice(0, m), right = a.slice(m);
-        left = _ms(left);
-        right = _ms(right);
-        return merge(left, right);
-    };
-    return _ms(array);
-};
-
-function set_difference(a, b) {
-    return a.filter(function(el){
-        return b.indexOf(el) < 0;
-    });
-};
-
-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);
-};
+    if (!Array.isArray(words)) words = words.split(" ");
+    var map = Object.create(null);
+    words.forEach(function(word) {
+        map[word] = true;
+    });
+    return map;
+}
 
 function all(array, predicate) {
     for (var i = array.length; --i >= 0;)
         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;
@@ -319,6 +236,13 @@ 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) {
@@ -336,20 +260,22 @@ 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); 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;
+    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;
         }
+        return false;
     }
 }

package.json

@@ -1,20 +1,17 @@
 {
-  "name": "uglify-es",
-  "description": "JavaScript parser, mangler/compressor and beautifier toolkit for ES6+",
-  "homepage": "https://github.com/mishoo/UglifyJS2/tree/harmony",
+  "name": "uglify-js",
+  "description": "JavaScript parser, mangler/compressor and beautifier toolkit",
   "author": "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)",
   "license": "BSD-2-Clause",
-  "version": "3.2.2",
+  "version": "3.4.0",
   "engines": {
     "node": ">=0.8.0"
   },
   "maintainers": [
+    "Alex Lam <alexlamsl@gmail.com>",
     "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)"
   ],
-  "repository": "git+https://github.com/mishoo/UglifyJS2.git#harmony",
-  "bugs": {
-    "url": "https://github.com/mishoo/UglifyJS2/issues"
-  },
+  "repository": "mishoo/UglifyJS2",
   "main": "tools/node.js",
   "bin": {
     "uglifyjs": "bin/uglifyjs"
@@ -26,33 +23,38 @@
     "LICENSE"
   ],
   "dependencies": {
-    "commander": "~2.12.1",
+    "commander": "~2.15.0",
     "source-map": "~0.6.1"
   },
   "devDependencies": {
-    "acorn": "~5.2.1",
-    "mocha": "~3.5.1",
-    "semver": "~5.4.1"
+    "acorn": "~5.5.3",
+    "semver": "~5.5.0"
   },
   "scripts": {
     "test": "node test/run-tests.js"
   },
   "keywords": [
-    "uglify",
-    "uglify-es",
-    "uglify-js",
-    "minify",
-    "minifier",
-    "javascript",
+    "cli",
+    "compress",
+    "compressor",
+    "ecma",
     "ecmascript",
+    "es",
     "es5",
-    "es6",
-    "es7",
-    "es8",
-    "es2015",
-    "es2016",
-    "es2017",
-    "async",
-    "await"
+    "javascript",
+    "js",
+    "jsmin",
+    "min",
+    "minification",
+    "minifier",
+    "minify",
+    "optimize",
+    "optimizer",
+    "pack",
+    "packer",
+    "parse",
+    "parser",
+    "uglifier",
+    "uglify"
   ]
 }

test/benchmark.js

@@ -21,12 +21,14 @@ var urls = [
     "http://builds.emberjs.com/tags/v2.11.0/ember.prod.js",
     "https://cdn.jsdelivr.net/lodash/4.17.4/lodash.js",
     "https://cdnjs.cloudflare.com/ajax/libs/d3/4.5.0/d3.js",
+    "https://raw.githubusercontent.com/kangax/html-minifier/v3.5.7/dist/htmlminifier.js",
 ];
 var results = {};
 var remaining = 2 * urls.length;
 function done() {
     if (!--remaining) {
         var failures = [];
+        var sum = { input: 0, output: 0, gzip: 0 };
         urls.forEach(function(url) {
             var info = results[url];
             console.log();
@@ -39,6 +41,9 @@ 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:");
@@ -46,6 +51,13 @@ 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");
         }
     }
 }

test/compress/arguments.js

@@ -0,0 +1,119 @@
+replace_index: {
+    options = {
+        arguments: true,
+        evaluate: true,
+        properties: true,
+    }
+    input: {
+        console.log(arguments && 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: {
+        console.log(arguments && 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_keep_fargs: {
+    options = {
+        arguments: true,
+        evaluate: true,
+        keep_fargs: false,
+        properties: true,
+    }
+    input: {
+        console.log(arguments && 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: {
+        console.log(arguments && 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",
+    ]
+}
+
+modified: {
+    options = {
+        arguments: true,
+    }
+    input: {
+        (function(a, b) {
+            var c = arguments[0];
+            var d = arguments[1];
+            a = "foo";
+            b++;
+            console.log(a, b, c, d, arguments[0], arguments[1]);
+        })("bar", 42);
+    }
+    expect: {
+        (function(a, b) {
+            var c = a;
+            var d = b;
+            a = "foo";
+            b++;
+            console.log(a, b, c, d, a, b);
+        })("bar", 42);
+    }
+    expect_stdout: "foo 43 bar 42 foo 43"
+}

test/compress/arrays.js

@@ -1,5 +1,3 @@
-// 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,,];
@@ -93,79 +91,6 @@ 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 = {
         unsafe: true,

test/compress/arrow.js

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

test/compress/asm.js

@@ -16,7 +16,6 @@ asm_mixed: {
         hoist_vars    : true,
         if_return     : true,
         join_vars     : true,
-        cascade       : true,
         side_effects  : true,
         negate_iife   : true
     };

test/compress/async.js

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

test/compress/block-scope.js

@@ -1,191 +0,0 @@
-
-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

@@ -47,142 +47,3 @@ 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/comparing.js

@@ -1,62 +1,42 @@
-keep_comparisons: {
+comparisons: {
     options = {
         comparisons: true,
-        unsafe_comps: false
     }
     input: {
-        var obj1 = {
-            valueOf: function() {triggeredFirst();}
-        }
-        var obj2 = {
-            valueOf: function() {triggeredSecond();}
-        }
+        var obj1, obj2;
         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 obj1, obj2;
         var result1 = obj1 <= obj2;
         var result2 = obj1 <  obj2;
-        var result3 = obj1 >= obj2;
-        var result4 = obj1 >  obj2;
+        var result3 = obj2 <= obj1;
+        var result4 = obj2 <  obj1;
     }
 }
 
-keep_comparisons_with_unsafe_comps: {
+unsafe_comps: {
     options = {
         comparisons: true,
-        unsafe_comps: true
+        conditionals: 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;
+        var obj1, obj2;
+        obj1 <= obj2 ? f1() : g1();
+        obj1 <  obj2 ? f2() : g2();
+        obj1 >= obj2 ? f3() : g3();
+        obj1 >  obj2 ? f4() : g4();
     }
     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;
+        var obj1, obj2;
+        obj2 <  obj1 ? g1() : f1();
+        obj1 <  obj2 ? f2() : g2();
+        obj1 <  obj2 ? g3() : f3();
+        obj2 <  obj1 ? f4() : g4();
     }
 }
 
@@ -112,3 +92,206 @@ self_comparison_2: {
     }
     expect_stdout: "false true"
 }
+
+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"
+}

test/compress/conditionals.js

@@ -332,7 +332,7 @@ cond_7: {
         x = 'foo';
         x = 'foo';
         x = (condition(), 20);
-        x = z ? 'fuji' : (condition(), 'fuji');
+        x = (z || condition(), 'fuji');
         x = (condition(), 'foobar');
         x = y ? a : b;
         x = y ? 'foo' : 'fo';
@@ -649,7 +649,7 @@ ternary_boolean_consequent: {
     options = {
         collapse_vars:true, sequences:true, properties:true, dead_code:true, conditionals:true,
         comparisons:true, evaluate:true, booleans:true, loops:true, unused:true, hoist_funs:true,
-        keep_fargs:true, if_return:true, join_vars:true, cascade:true, side_effects:true
+        keep_fargs:true, if_return:true, join_vars:true, side_effects:true
     }
     input: {
         function f1() { return a == b ? true : x; }
@@ -677,7 +677,7 @@ ternary_boolean_alternative: {
     options = {
         collapse_vars:true, sequences:true, properties:true, dead_code:true, conditionals:true,
         comparisons:true, evaluate:true, booleans:true, loops:true, unused:true, hoist_funs:true,
-        keep_fargs:true, if_return:true, join_vars:true, cascade:true, side_effects:true
+        keep_fargs:true, if_return:true, join_vars:true, side_effects:true
     }
     input: {
         function f1() { return a == b ? x : true; }
@@ -703,10 +703,11 @@ ternary_boolean_alternative: {
 
 trivial_boolean_ternary_expressions : {
     options = {
+        booleans: true,
         conditionals: true,
-        evaluate    : true,
-        booleans    : true
-    };
+        evaluate: true,
+        side_effects: true,
+    }
     input: {
         f('foo' in m ? true  : false);
         f('foo' in m ? false : true);
@@ -1203,3 +1204,67 @@ issue_2560: {
         "2",
     ]
 }
+
+hoist_decl: {
+    options = {
+        conditionals: true,
+        join_vars: true,
+        sequences: true,
+    }
+    input: {
+        if (x()) {
+            var a;
+            y();
+        } else {
+            z();
+            var b;
+        }
+    }
+    expect: {
+        var a, b;
+        x() ? y() : z();
+    }
+}
+
+to_and_or: {
+    options = {
+        conditionals: true,
+    }
+    input: {
+        var values = [
+            0,
+            null,
+            true,
+            "foo",
+            false,
+            -1 / 0,
+            void 0,
+        ];
+        values.forEach(function(x) {
+            values.forEach(function(y) {
+                values.forEach(function(z) {
+                    console.log(x ? y || z : z);
+                });
+            });
+        });
+    }
+    expect: {
+        var values = [
+            0,
+            null,
+            true,
+            "foo",
+            false,
+            -1 / 0,
+            void 0,
+        ];
+        values.forEach(function(x) {
+            values.forEach(function(y) {
+                values.forEach(function(z) {
+                    console.log(x && y || z);
+                });
+            });
+        });
+    }
+    expect_stdout: true
+}

test/compress/const.js

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

test/compress/dead-code.js

@@ -54,52 +54,12 @@ dead_code_2_should_warn: {
             x = 10;
             throw new Error("foo");
             var x;
-            var g;
+            function g(){};
         }
         f();
     }
     expect_stdout: true
-    node_version: ">=6"
-}
-
-dead_code_2_should_warn_strict: {
-    options = {
-        dead_code: true
-    };
-    input: {
-        "use strict";
-        function f() {
-            g();
-            x = 10;
-            throw new Error("foo");
-            // completely discarding the `if` would introduce some
-            // bugs.  UglifyJS v1 doesn't deal with this issue; in v2
-            // we copy any declarations to the upper scope.
-            if (x) {
-                y();
-                var x;
-                function g(){};
-                // but nested declarations should not be kept.
-                (function(){
-                    var q;
-                    function y(){};
-                })();
-            }
-        }
-        f();
-    }
-    expect: {
-        "use strict";
-        function f() {
-            g();
-            x = 10;
-            throw new Error("foo");
-            var x;
-        }
-        f();
-    }
-    expect_stdout: true
-    node_version: ">=4"
+    node_version: "<=4"
 }
 
 dead_code_constant_boolean_should_warn_more: {
@@ -126,7 +86,7 @@ dead_code_constant_boolean_should_warn_more: {
     }
     expect: {
         var foo;
-        var bar;
+        function bar() {}
         // nothing for the while
         // as for the for, it should keep:
         var moo;
@@ -134,198 +94,7 @@ dead_code_constant_boolean_should_warn_more: {
         bar();
     }
     expect_stdout: true
-    node_version: ">=6"
-}
-
-dead_code_constant_boolean_should_warn_more_strict: {
-    options = {
-        dead_code    : true,
-        loops        : true,
-        booleans     : true,
-        conditionals : true,
-        evaluate     : true,
-        side_effects : true,
-    };
-    input: {
-        "use strict";
-        while (!((foo && bar) || (x + "0"))) {
-            console.log("unreachable");
-            var foo;
-            function bar() {}
-        }
-        for (var x = 10, y; x && (y || x) && (!typeof x); ++x) {
-            asdf();
-            foo();
-            var moo;
-        }
-        bar();
-    }
-    expect: {
-        "use strict";
-        var foo;
-        // nothing for the while
-        // as for the for, it should keep:
-        var moo;
-        var x = 10, y;
-        bar();
-    }
-    expect_stdout: true
-    node_version: ">=4"
-}
-
-dead_code_block_decls_die: {
-    options = {
-        booleans: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        side_effects: true,
-    };
-    input: {
-        if (0) {
-            let foo = 6;
-            const bar = 12;
-            class Baz {};
-            var qux;
-        }
-        console.log(foo, bar, Baz);
-    }
-    expect: {
-        var qux;
-        console.log(foo, bar, Baz);
-    }
-}
-
-dead_code_const_declaration: {
-    options = {
-        booleans: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        loops: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        side_effects: true,
-    };
-    input: {
-        var unused;
-        const CONST_FOO = false;
-        if (CONST_FOO) {
-            console.log("unreachable");
-            var moo;
-            function bar() {}
-        }
-    }
-    expect: {
-        var unused;
-        const CONST_FOO = !1;
-        var moo;
-        var bar;
-    }
-    expect_stdout: true
-}
-
-dead_code_const_annotation: {
-    options = {
-        booleans: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        loops: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        side_effects: true,
-        toplevel: true,
-    };
-    input: {
-        var unused;
-        /** @const */ var CONST_FOO_ANN = false;
-        if (CONST_FOO_ANN) {
-            console.log("unreachable");
-            var moo;
-            function bar() {}
-        }
-    }
-    expect: {
-        var unused;
-        var CONST_FOO_ANN = !1;
-        var moo;
-        var bar;
-    }
-    expect_stdout: true
-}
-
-dead_code_const_annotation_regex: {
-    options = {
-        dead_code    : true,
-        loops        : true,
-        booleans     : true,
-        conditionals : true,
-        evaluate     : true
-    };
-    input: {
-        var unused;
-        // @constraint this shouldn't be a constant
-        var CONST_FOO_ANN = false;
-        if (CONST_FOO_ANN) {
-            console.log("reachable");
-        }
-    }
-    expect: {
-        var unused;
-        var CONST_FOO_ANN = !1;
-        CONST_FOO_ANN && console.log('reachable');
-    }
-    expect_stdout: true
-}
-
-dead_code_const_annotation_complex_scope: {
-    options = {
-        booleans: true,
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        loops: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        sequences: true,
-        side_effects: true,
-        toplevel: true,
-    };
-    input: {
-        var unused_var;
-        /** @const */ var test = 'test';
-        // @const
-        var CONST_FOO_ANN = false;
-        var unused_var_2;
-        if (CONST_FOO_ANN) {
-            console.log("unreachable");
-            var moo;
-            function bar() {}
-        }
-        if (test === 'test') {
-            var beef = 'good';
-            /** @const */ var meat = 'beef';
-            var pork = 'bad';
-            if (meat === 'pork') {
-                console.log('also unreachable');
-            } else if (pork === 'good') {
-                console.log('reached, not const');
-            }
-        }
-    }
-    expect: {
-        var unused_var;
-        var test = 'test';
-        var CONST_FOO_ANN = !1;
-        var unused_var_2;
-        var moo;
-        var bar;
-        var beef = 'good';
-        var meat = 'beef';
-        var pork = 'bad';
-    }
-    expect_stdout: true
+    node_version: "<=4"
 }
 
 try_catch_finally: {
@@ -573,66 +342,603 @@ global_fns: {
     ]
 }
 
-issue_2383_1: {
+collapse_vars_assignment: {
     options = {
-        conditionals: true,
+        collapse_vars: true,
         dead_code: true,
-        evaluate: true,
-        side_effects: true,
+        passes: 2,
+        unused: true,
     }
     input: {
-        if (0) {
-            var {x, y} = foo();
+        function f0(c) {
+            var a = 3 / c;
+            return a = a;
         }
     }
     expect: {
-        var x, y;
+        function f0(c) {
+            return 3 / c;
+        }
     }
 }
 
-issue_2383_2: {
+collapse_vars_lvalues_drop_assign: {
     options = {
-        conditionals: true,
+        collapse_vars: true,
         dead_code: true,
-        evaluate: true,
-        side_effects: true,
+        unused: true,
     }
     input: {
-        if (0) {
-            var {
-                x = 0,
-                y: [ w, , { z, p: q = 7 } ] = [ 1, 2, { z: 3 } ]
-            } = {};
-        }
-        console.log(x, q, w, z);
+        function f0(x) { var i = ++x; return x += i; }
+        function f1(x) { var a = (x -= 3); return x += a; }
+        function f2(x) { var z = x, a = ++z; return z += a; }
     }
     expect: {
-        var x, w, z, q;
-        console.log(x, q, w, z);
+        function f0(x) { var i = ++x; return x + i; }
+        function f1(x) { var a = (x -= 3); return x + a; }
+        function f2(x) { var z = x, a = ++z; return z + a; }
     }
-    expect_stdout: "undefined undefined undefined undefined"
-    node_version: ">=6"
 }
 
-issue_2383_3: {
+collapse_vars_misc1: {
     options = {
-        conditionals: true,
+        collapse_vars: true,
         dead_code: true,
-        evaluate: true,
-        side_effects: true,
+        unused: true,
     }
     input: {
-        var b = 7, y = 8;
-        if (0) {
-            var a = 1, [ x, y, z ] = [ 2, 3, 4 ], b = 5;
-        }
-        console.log(a, x, y, z, b);
+        function f10(x) { var a = 5, b = 3; return a += b; }
+        function f11(x) { var a = 5, b = 3; return a += --b; }
     }
     expect: {
-        var b = 7, y = 8;
-        var a, x, y, z, b;
-        console.log(a, x, y, z, b);
+        function f10(x) { return 5 + 3; }
+        function f11(x) { var b = 3; return 5 + --b; }
     }
-    expect_stdout: "undefined undefined 8 undefined 7"
-    node_version: ">=6"
+}
+
+return_assignment: {
+    options = {
+        dead_code: true,
+        unused: true,
+    }
+    input: {
+        function f1(a, b, c) {
+            return a = x(), b = y(), b = a && (c >>= 5);
+        }
+        function f2() {
+            return e = x();
+        }
+        function f3(e) {
+            return e = x();
+        }
+        function f4() {
+            var e;
+            return e = x();
+        }
+        function f5(a) {
+            try {
+                return a = x();
+            } catch (b) {
+                console.log(a);
+            }
+        }
+        function f6(a) {
+            try {
+                return a = x();
+            } finally {
+                console.log(a);
+            }
+        }
+        function y() {
+            console.log("y");
+        }
+        function test(inc) {
+            var counter = 0;
+            x = function() {
+                counter += inc;
+                if (inc < 0) throw counter;
+                return counter;
+            };
+            [ f1, f2, f3, f4, f5, f6 ].forEach(function(f, i) {
+                e = null;
+                try {
+                    i += 1;
+                    console.log("result " + f(10 * i, 100 * i, 1000 * i));
+                } catch (x) {
+                    console.log("caught " + x);
+                }
+                if (null !== e) console.log("e: " + e);
+            });
+        }
+        var x, e;
+        test(1);
+        test(-1);
+    }
+    expect: {
+        function f1(a, b, c) {
+            return a = x(), y(), a && (c >> 5);
+        }
+        function f2() {
+            return e = x();
+        }
+        function f3(e) {
+            return x();
+        }
+        function f4() {
+            return x();
+        }
+        function f5(a) {
+            try {
+                return x();
+            } catch (b) {
+                console.log(a);
+            }
+        }
+        function f6(a) {
+            try {
+                return a = x();
+            } finally {
+                console.log(a);
+            }
+        }
+        function y() {
+            console.log("y");
+        }
+        function test(inc) {
+            var counter = 0;
+            x = function() {
+                counter += inc;
+                if (inc < 0) throw counter;
+                return counter;
+            };
+            [ f1, f2, f3, f4, f5, f6 ].forEach(function(f, i) {
+                e = null;
+                try {
+                    i += 1;
+                    console.log("result " + f(10 * i, 100 * i, 1000 * i));
+                } catch (x) {
+                    console.log("caught " + x);
+                }
+                if (null !== e) console.log("e: " + e);
+            });
+        }
+        var x, e;
+        test(1);
+        test(-1);
+    }
+    expect_stdout: [
+        "y",
+        "result 31",
+        "result 2",
+        "e: 2",
+        "result 3",
+        "result 4",
+        "result 5",
+        "6",
+        "result 6",
+        "caught -1",
+        "caught -2",
+        "caught -3",
+        "caught -4",
+        "50",
+        "result undefined",
+        "60",
+        "caught -6",
+    ]
+}
+
+throw_assignment: {
+    options = {
+        dead_code: true,
+        unused: true,
+    }
+    input: {
+        function f1() {
+            throw a = x();
+        }
+        function f2(a) {
+            throw a = x();
+        }
+        function f3() {
+            var a;
+            throw a = x();
+        }
+        function f4() {
+            try {
+                throw a = x();
+            } catch (b) {
+                console.log(a);
+            }
+        }
+        function f5(a) {
+            try {
+                throw a = x();
+            } catch (b) {
+                console.log(a);
+            }
+        }
+        function f6() {
+            var a;
+            try {
+                throw a = x();
+            } catch (b) {
+                console.log(a);
+            }
+        }
+        function f7() {
+            try {
+                throw a = x();
+            } finally {
+                console.log(a);
+            }
+        }
+        function f8(a) {
+            try {
+                throw a = x();
+            } finally {
+                console.log(a);
+            }
+        }
+        function f9() {
+            var a;
+            try {
+                throw a = x();
+            } finally {
+                console.log(a);
+            }
+        }
+        function test(inc) {
+            var counter = 0;
+            x = function() {
+                counter += inc;
+                if (inc < 0) throw counter;
+                return counter;
+            };
+            [ f1, f2, f3, f4, f5, f6, f7, f8, f9 ].forEach(function(f, i) {
+                a = null;
+                try {
+                    f(10 * (1 + i));
+                } catch (x) {
+                    console.log("caught " + x);
+                }
+                if (null !== a) console.log("a: " + a);
+            });
+        }
+        var x, a;
+        test(1);
+        test(-1);
+    }
+    expect: {
+        function f1() {
+            throw a = x();
+        }
+        function f2(a) {
+            throw x();
+        }
+        function f3() {
+            throw x();
+        }
+        function f4() {
+            try {
+                throw a = x();
+            } catch (b) {
+                console.log(a);
+            }
+        }
+        function f5(a) {
+            try {
+                throw a = x();
+            } catch (b) {
+                console.log(a);
+            }
+        }
+        function f6() {
+            var a;
+            try {
+                throw a = x();
+            } catch (b) {
+                console.log(a);
+            }
+        }
+        function f7() {
+            try {
+                throw a = x();
+            } finally {
+                console.log(a);
+            }
+        }
+        function f8(a) {
+            try {
+                throw a = x();
+            } finally {
+                console.log(a);
+            }
+        }
+        function f9() {
+            var a;
+            try {
+                throw a = x();
+            } finally {
+                console.log(a);
+            }
+        }
+        function test(inc) {
+            var counter = 0;
+            x = function() {
+                counter += inc;
+                if (inc < 0) throw counter;
+                return counter;
+            };
+            [ f1, f2, f3, f4, f5, f6, f7, f8, f9 ].forEach(function(f, i) {
+                a = null;
+                try {
+                    f(10 * (1 + i));
+                } catch (x) {
+                    console.log("caught " + x);
+                }
+                if (null !== a) console.log("a: " + a);
+            });
+        }
+        var x, a;
+        test(1);
+        test(-1);
+    }
+    expect_stdout: [
+        "caught 1",
+        "a: 1",
+        "caught 2",
+        "caught 3",
+        "4",
+        "a: 4",
+        "5",
+        "6",
+        "7",
+        "caught 7",
+        "a: 7",
+        "8",
+        "caught 8",
+        "9",
+        "caught 9",
+        "caught -1",
+        "caught -2",
+        "caught -3",
+        "null",
+        "50",
+        "undefined",
+        "null",
+        "caught -7",
+        "80",
+        "caught -8",
+        "undefined",
+        "caught -9",
+    ]
+}
+
+issue_2597: {
+    options = {
+        dead_code: true,
+    }
+    input: {
+        function f(b) {
+            try {
+                try {
+                    throw "foo";
+                } catch (e) {
+                    return b = true;
+                }
+            } finally {
+                b && (a = "PASS");
+            }
+        }
+        var a = "FAIL";
+        f();
+        console.log(a);
+    }
+    expect: {
+        function f(b) {
+            try {
+                try {
+                    throw "foo";
+                } catch (e) {
+                    return b = true;
+                }
+            } finally {
+                b && (a = "PASS");
+            }
+        }
+        var a = "FAIL";
+        f();
+        console.log(a);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_2666: {
+    options = {
+        dead_code: true,
+    }
+    input: {
+        function f(a) {
+            return a = {
+                p: function() {
+                    return a;
+                }
+            };
+        }
+        console.log(typeof f().p());
+    }
+    expect: {
+        function f(a) {
+            return a = {
+                p: function() {
+                    return a;
+                }
+            };
+        }
+        console.log(typeof f().p());
+    }
+    expect_stdout: "object"
+}
+
+issue_2692: {
+    options = {
+        dead_code: true,
+        reduce_vars: false,
+    }
+    input: {
+        function f(a) {
+            return a = g;
+            function g() {
+                return a;
+            }
+        }
+        console.log(typeof f()());
+    }
+    expect: {
+        function f(a) {
+            return a = g;
+            function g() {
+                return a;
+            }
+        }
+        console.log(typeof f()());
+    }
+    expect_stdout: "function"
+}
+
+issue_2701: {
+    options = {
+        dead_code: true,
+        inline: false,
+    }
+    input: {
+        function f(a) {
+            return a = function() {
+                return function() {
+                    return a;
+                };
+            }();
+        }
+        console.log(typeof f()());
+    }
+    expect: {
+        function f(a) {
+            return a = function() {
+                return function() {
+                    return a;
+                };
+            }();
+        }
+        console.log(typeof f()());
+    }
+    expect_stdout: "function"
+}
+
+issue_2749: {
+    options = {
+        dead_code: true,
+        inline: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = 2, c = "PASS";
+        while (a--)
+            (function() {
+                return b ? c = "FAIL" : b = 1;
+                try {
+                } catch (b) {
+                    var b;
+                }
+            })();
+        console.log(c);
+    }
+    expect: {
+        var a = 2, c = "PASS";
+        while (a--)
+            b = void 0, b ? c = "FAIL" : b = 1;
+        var b;
+        console.log(c);
+    }
+    expect_stdout: "PASS"
+}
+
+unsafe_builtin: {
+    options = {
+        side_effects: true,
+        unsafe: true,
+    }
+    input: {
+        (!w).constructor(x);
+        Math.abs(y);
+        [ 1, 2, z ].valueOf();
+    }
+    expect: {
+        w, x;
+        y;
+        z;
+    }
+}
+
+issue_2860_1: {
+    options = {
+        dead_code: true,
+        evaluate: true,
+        reduce_vars: true,
+    }
+    input: {
+        console.log(function(a) {
+            return a ^= 1;
+        }());
+    }
+    expect: {
+        console.log(function(a) {
+            return 1 ^ a;
+        }());
+    }
+    expect_stdout: "1"
+}
+
+issue_2860_2: {
+    options = {
+        dead_code: true,
+        evaluate: true,
+        inline: true,
+        passes: 2,
+        reduce_vars: true,
+    }
+    input: {
+        console.log(function(a) {
+            return a ^= 1;
+        }());
+    }
+    expect: {
+        console.log(1);
+    }
+    expect_stdout: "1"
+}
+
+issue_2929: {
+    options = {
+        dead_code: true,
+    }
+    input: {
+        console.log(function(a) {
+            try {
+                return null.p = a = 1;
+            } catch (e) {
+                return a ? "PASS" : "FAIL";
+            }
+        }());
+    }
+    expect: {
+        console.log(function(a) {
+            try {
+                return null.p = a = 1;
+            } catch (e) {
+                return a ? "PASS" : "FAIL";
+            }
+        }());
+    }
+    expect_stdout: "PASS"
 }

test/compress/destructuring.js

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

test/compress/directives.js

@@ -1,10 +0,0 @@
-class_directives_compression: {
-    input: {
-        class foo {
-            foo() {
-                "use strict";
-            }
-        }
-    }
-    expect_exact: "class foo{foo(){}}"
-}

test/compress/drop-unused.js

@@ -164,87 +164,6 @@ used_var_in_catch: {
     }
 }
 
-unused_block_decls_in_catch: {
-    options = { unused: true };
-    input: {
-        function foo() {
-            try {
-                foo();
-            } catch(ex) {
-                let x = 10;
-                const y = 10;
-                class Zee {};
-            }
-        }
-    }
-    expect: {
-        function foo() {
-            try {
-                foo();
-            } catch(ex) {}
-        }
-    }
-}
-
-used_block_decls_in_catch: {
-    options = { unused: true };
-    input: {
-        function foo() {
-            try {
-                foo();
-            } catch(ex) {
-                let x = 10;
-                const y = 10;
-                class Zee {};
-            }
-            console.log(x, y, Zee);
-        }
-    }
-    expect: {
-        function foo() {
-            try {
-                foo();
-            } catch(ex) {}
-            console.log(x, y, Zee);
-        }
-    }
-}
-
-unused_block_decls: {
-    options = { unused: true };
-    input: {
-        function foo() {
-            {
-                const x;
-            }
-            {
-                let y;
-            }
-            console.log(x, y);
-        }
-    }
-    expect: {
-        function foo() {
-            console.log(x, y);
-        }
-    }
-}
-
-unused_keep_harmony_destructuring: {
-    options = { unused: true };
-    input: {
-        function foo() {
-            var {x, y} = foo;
-            var a = foo;
-        }
-    }
-    expect:  {
-        function foo() {
-            var {x, y} = foo;
-        }
-    }
-}
-
 keep_fnames: {
     options = { unused: true, keep_fnames: true, unsafe: true };
     input: {
@@ -764,41 +683,9 @@ drop_value: {
     }
 }
 
-const_assign: {
-    options = {
-        evaluate: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        function f() {
-            const b = 2;
-            return 1 + b;
-        }
-
-        function g() {
-            const b = 2;
-            b = 3;
-            return 1 + b;
-        }
-    }
-    expect: {
-        function f() {
-            return 3;
-        }
-
-        function g() {
-            const b = 2;
-            b = 3;
-            return 1 + b;
-        }
-    }
-}
-
 issue_1539: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         sequences: true,
         side_effects: true,
         unused: true,
@@ -845,7 +732,7 @@ vardef_value: {
 
 assign_binding: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         side_effects: true,
         unused: true,
     }
@@ -934,10 +821,6 @@ issue_1709: {
                 var x = 1;
                 return x;
             }(),
-            function y() {
-                const y = 2;
-                return y;
-            }(),
             function z() {
                 function z() {}
                 return z;
@@ -950,10 +833,6 @@ issue_1709: {
                 var x = 1;
                 return x;
             }(),
-            function() {
-                const y = 2;
-                return y;
-            }(),
             function() {
                 function z() {}
                 return z;
@@ -1267,71 +1146,6 @@ var_catch_toplevel: {
     }
 }
 
-reassign_const: {
-    options = {
-        cascade: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        function f() {
-            const a = 1;
-            a = 2;
-            return a;
-        }
-        console.log(f());
-    }
-    expect: {
-        function f() {
-            const a = 1;
-            return a = 2, a;
-        }
-        console.log(f());
-    }
-    expect_stdout: true
-}
-
-issue_1968: {
-    options = {
-        unused: true,
-    }
-    input: {
-        function f(c) {
-            var a;
-            if (c) {
-                let b;
-                return (a = 2) + (b = 3);
-            }
-        }
-        console.log(f(1));
-    }
-    expect: {
-        function f(c) {
-            if (c) {
-                let b;
-                return 2 + (b = 3);
-            }
-        }
-        console.log(f(1));
-    }
-    expect_stdout: "5"
-    node_version: ">=6"
-}
-
-issue_2063: {
-    options = {
-        unused: true,
-    }
-    input: {
-        var a;
-        var a;
-    }
-    expect: {
-        var a;
-    }
-}
-
 issue_2105_1: {
     options = {
         collapse_vars: true,
@@ -1412,95 +1226,6 @@ issue_2105_2: {
     expect_stdout: "PASS"
 }
 
-issue_2136_1: {
-    options = {
-        inline: true,
-        unused: true,
-    }
-    input: {
-        !function(a, ...b) {
-            console.log(b);
-        }();
-    }
-    expect: {
-        !function(a, ...b) {
-            console.log(b);
-        }();
-    }
-    expect_stdout: "[]"
-    node_version: ">=6"
-}
-
-issue_2136_2: {
-    options = {
-        collapse_vars: true,
-        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 = {
-        collapse_vars: true,
-        evaluate: true,
-        inline: true,
-        passes: 3,
-        reduce_funcs: true,
-        reduce_vars: true,
-        side_effects: true,
-        toplevel: true,
-        unsafe: true,
-        unused: true,
-    }
-    input: {
-        function f(x) {
-            console.log(x);
-        }
-        !function(a, ...b) {
-            f(b[0]);
-        }(1, 2, 3);
-    }
-    expect: {
-        console.log(2);
-    }
-    expect_stdout: "2"
-    node_version: ">=6"
-}
-
-issue_2163: {
-    options = {
-        pure_funcs: [ "pure" ],
-        side_effects: true,
-    }
-    input: {
-        var c;
-        /*@__PURE__*/f(...a);
-        pure(b, ...c);
-    }
-    expect: {
-        var c;
-        a;
-        b;
-    }
-}
-
 issue_2226_1: {
     options = {
         side_effects: true,
@@ -1548,7 +1273,7 @@ issue_2226_1: {
 
 issue_2226_2: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         sequences: true,
         side_effects: true,
         unused: true,
@@ -1561,8 +1286,8 @@ issue_2226_2: {
     }
     expect: {
         console.log(function(a, b) {
-            return a += b;
-        }(1, 2));
+            return a += 2;
+        }(1));
     }
     expect_stdout: "3"
 }
@@ -1689,100 +1414,515 @@ issue_2516_2: {
     }
 }
 
-issue_2418_1: {
+defun_lambda_same_name: {
     options = {
+        toplevel: true,
         unused: true,
     }
     input: {
-        class C {}
-        function F() {}
-        (class c {});
-        (function f() {});
+        function f(n) {
+            return n ? n * f(n - 1) : 1;
+        }
+        console.log(function f(n) {
+            return n ? n * f(n - 1) : 1;
+        }(5));
     }
     expect: {
-        class C {}
-        function F() {}
-        (class {});
-        (function() {});
+        console.log(function f(n) {
+            return n ? n * f(n - 1) : 1;
+        }(5));
+    }
+    expect_stdout: "120"
+}
+
+issue_2660_1: {
+    options = {
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = 2;
+        function f(b) {
+            return b && f() || a--;
+        }
+        f(1);
+        console.log(a);
+    }
+    expect: {
+        var a = 2;
+        (function f(b) {
+            return b && f() || a--;
+        })(1);
+        console.log(a);
+    }
+    expect_stdout: "1"
+}
+
+issue_2660_2: {
+    options = {
+        collapse_vars: true,
+        reduce_vars: true,
+        sequences: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = 1;
+        function f(b) {
+            b && f();
+            --a, a.toString();
+        }
+        f();
+        console.log(a);
+    }
+    expect: {
+        var a = 1;
+        (function f(b) {
+            b && f(),
+            (--a).toString();
+        })(),
+        console.log(a);
+    }
+    expect_stdout: "0"
+}
+
+issue_2665: {
+    options = {
+        evaluate: true,
+        inline: true,
+        keep_fargs: false,
+        passes: 2,
+        reduce_funcs: true,
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        typeofs: true,
+        unused: true,
+    }
+    input: {
+        var a = 1;
+        function g() {
+            a-- && g();
+        }
+        typeof h == "function" && h();
+        function h() {
+            typeof g == "function" && g();
+        }
+        console.log(a);
+    }
+    expect: {
+        var a = 1;
+        !function g() {
+            a-- && g();
+        }();
+        console.log(a);
+    }
+    expect_stdout: "-1"
+}
+
+double_assign_1: {
+    options = {
+        passes: 2,
+        reduce_vars: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        function f1() {
+            var a = {};
+            var a = [];
+            return a;
+        }
+        function f2() {
+            var a = {};
+            a = [];
+            return a;
+        }
+        function f3() {
+            a = {};
+            var a = [];
+            return a;
+        }
+        function f4(a) {
+            a = {};
+            a = [];
+            return a;
+        }
+        function f5(a) {
+            var a = {};
+            a = [];
+            return a;
+        }
+        function f6(a) {
+            a = {};
+            var a = [];
+            return a;
+        }
+        console.log(f1(), f2(), f3(), f4(), f5(), f6());
+    }
+    expect: {
+        function f1() {
+            return [];
+        }
+        function f2() {
+            var a;
+            a = [];
+            return a;
+        }
+        function f3() {
+            return [];
+        }
+        function f4(a) {
+            a = [];
+            return a;
+        }
+        function f5(a) {
+            a = [];
+            return a;
+        }
+        function f6(a) {
+            a = [];
+            return a;
+        }
+        console.log(f1(), f2(), f3(), f4(), f5(), f6());
+    }
+    expect_stdout: true
+}
+
+double_assign_2: {
+    options = {
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        for (var i = 0; i < 2; i++)
+            a = void 0, a = {}, console.log(a);
+        var a;
+    }
+    expect: {
+        for (var i = 0; i < 2; i++)
+            void 0, a = {}, console.log(a);
+        var a;
     }
 }
 
-issue_2418_2: {
+double_assign_3: {
     options = {
-        keep_classnames: false,
-        keep_fnames: false,
+        reduce_vars: true,
+        toplevel: true,
         unused: true,
     }
     input: {
-        class C {}
-        function F() {}
-        (class c {});
-        (function f() {});
+        for (var i = 0; i < 2; i++)
+            a = void 0, a = { a: a }, console.log(a);
+        var a;
     }
     expect: {
-        class C {}
-        function F() {}
-        (class {});
-        (function() {});
+        for (var i = 0; i < 2; i++)
+            a = void 0, a = { a: a }, console.log(a);
+        var a;
     }
 }
 
-issue_2418_3: {
+cascade_drop_assign: {
     options = {
-        keep_classnames: false,
-        keep_fnames: true,
+        reduce_vars: true,
+        toplevel: true,
         unused: true,
     }
     input: {
-        class C {}
-        function F() {}
-        (class c {});
-        (function f() {});
+        var a, b = a = "PASS";
+        console.log(b);
     }
     expect: {
-        class C {}
-        function F() {}
-        (class {});
-        (function f() {});
+        var b = "PASS";
+        console.log(b);
     }
+    expect_stdout: "PASS"
 }
 
-issue_2418_4: {
+chained_3: {
     options = {
-        keep_classnames: true,
-        keep_fnames: false,
+        reduce_vars: true,
         unused: true,
     }
     input: {
-        class C {}
-        function F() {}
-        (class c {});
-        (function f() {});
+        console.log(function(a, b) {
+            var c = a, c = b;
+            b++;
+            return c;
+        }(1, 2));
     }
     expect: {
-        class C {}
-        function F() {}
-        (class c {});
-        (function() {});
+        console.log(function(a, b) {
+            var c = b;
+            b++;
+            return c;
+        }(0, 2));
     }
+    expect_stdout: "2"
 }
 
-issue_2418_5: {
+issue_2768: {
     options = {
-        keep_classnames: true,
-        keep_fnames: true,
+        inline: true,
+        reduce_vars: true,
+        sequences: true,
+        side_effects: true,
+        toplevel: true,
         unused: true,
     }
     input: {
-        class C {}
-        function F() {}
-        (class c {});
-        (function f() {});
+        var a = "FAIL", c = 1;
+        var c = function(b) {
+            var d = b = a;
+            var e = --b + (d && (a = "PASS"));
+        }();
+        console.log(a, typeof c);
     }
     expect: {
-        class C {}
-        function F() {}
-        (class c {});
-        (function f() {});
+        var a = "FAIL";
+        var c = (d = a, 0, void (d && (a = "PASS")));
+        var d;
+        console.log(a, typeof c);
     }
+    expect_stdout: "PASS undefined"
+}
+
+issue_2846: {
+    options = {
+        collapse_vars: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        function f(a, b) {
+            var a = 0;
+            b && b(a);
+            return a++;
+        }
+        var c = f();
+        console.log(c);
+    }
+    expect: {
+        var c = function(a, b) {
+            a = 0;
+            b && b(a);
+            return a++;
+        }();
+        console.log(c);
+    }
+    expect_stdout: "0"
+}
+
+issue_805_1: {
+    options = {
+        inline: true,
+        passes: 2,
+        pure_getters: "strict",
+        reduce_vars: true,
+        sequences: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        (function(a) {
+            var unused = function() {};
+            unused.prototype[a()] = 42;
+            (unused.prototype.bar = function() {
+                console.log("bar");
+            })();
+            return unused;
+        })(function() {
+            console.log("foo");
+            return "foo";
+        });
+    }
+    expect: {
+        console.log("foo"),
+        console.log("bar");
+    }
+    expect_stdout: [
+        "foo",
+        "bar",
+    ]
+}
+
+issue_805_2: {
+    options = {
+        inline: true,
+        passes: 2,
+        pure_getters: "strict",
+        reduce_vars: true,
+        sequences: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        (function(a) {
+            function unused() {}
+            unused.prototype[a()] = 42;
+            (unused.prototype.bar = function() {
+                console.log("bar");
+            })();
+            return unused;
+        })(function() {
+            console.log("foo");
+            return "foo";
+        });
+    }
+    expect: {
+        console.log("foo"),
+        console.log("bar");
+    }
+    expect_stdout: [
+        "foo",
+        "bar",
+    ]
+}
+
+issue_2995: {
+    options = {
+        pure_getters: "strict",
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        function f(a) {
+            var b;
+            a.b = b = function() {};
+            b.c = "PASS";
+        }
+        var o = {};
+        f(o);
+        console.log(o.b.c);
+    }
+    expect: {
+        function f(a) {
+            var b;
+            a.b = b = function() {};
+            b.c = "PASS";
+        }
+        var o = {};
+        f(o);
+        console.log(o.b.c);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_3146_1: {
+    options = {
+        collapse_vars: true,
+        unused: true,
+    }
+    input: {
+        (function(f) {
+            f("g()");
+        })(function(a) {
+            eval(a);
+            function g(b) {
+                if (!b) b = "PASS";
+                console.log(b);
+            }
+        });
+    }
+    expect: {
+        (function(f) {
+            f("g()");
+        })(function(a) {
+            eval(a);
+            function g(b) {
+                if (!b) b = "PASS";
+                console.log(b);
+            }
+        });
+    }
+    expect_stdout: "PASS"
+}
+
+issue_3146_2: {
+    options = {
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function(f) {
+            f("g()");
+        })(function(a) {
+            eval(a);
+            function g(b) {
+                if (!b) b = "PASS";
+                console.log(b);
+            }
+        });
+    }
+    expect: {
+        (function(f) {
+            f("g()");
+        })(function(a) {
+            eval(a);
+            function g(b) {
+                if (!b) b = "PASS";
+                console.log(b);
+            }
+        });
+    }
+    expect_stdout: "PASS"
+}
+
+issue_3146_3: {
+    options = {
+        collapse_vars: true,
+        unused: true,
+    }
+    input: {
+        var g = "PASS";
+        (function(f) {
+            var g = "FAIL";
+            f("console.log(g)", g[g]);
+        })(function(a) {
+            eval(a);
+        });
+    }
+    expect: {
+        var g = "PASS";
+        (function(f) {
+            var g = "FAIL";
+            f("console.log(g)", g[g]);
+        })(function(a) {
+            eval(a);
+        });
+    }
+    expect_stdout: "PASS"
+}
+
+issue_3146_4: {
+    options = {
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        var g = "PASS";
+        (function(f) {
+            var g = "FAIL";
+            f("console.log(g)", g[g]);
+        })(function(a) {
+            eval(a);
+        });
+    }
+    expect: {
+        var g = "PASS";
+        (function(f) {
+            var g = "FAIL";
+            f("console.log(g)", g[g]);
+        })(function(a) {
+            eval(a);
+        });
+    }
+    expect_stdout: "PASS"
 }

test/compress/evaluate.js

@@ -227,100 +227,6 @@ positive_zero: {
     expect_stdout: true
 }
 
-pow: {
-    options = { evaluate: true }
-    input: {
-        var a = 5 ** 3;
-    }
-    expect: {
-        var a = 125;
-    }
-}
-
-pow_sequence: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        var a = 2 ** 3 ** 2;
-    }
-    expect: {
-        var a = 512;
-    }
-}
-
-pow_mixed: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        var a = 5 + 2 ** 3 + 5;
-        var b = 5 * 3 ** 2;
-        var c = 5 ** 3 * 2;
-        var d = 5 ** +3;
-    }
-    expect: {
-        var a = 18;
-        var b = 45;
-        var c = 250;
-        var d = 125;
-    }
-}
-
-pow_with_right_side_evaluating_to_unary: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        var a = (4 - 7) ** foo;
-        var b = ++bar ** 3;
-        var c = --baz ** 2;
-    }
-    expect_exact: "var a=(-3)**foo;var b=++bar**3;var c=--baz**2;"
-}
-
-pow_with_number_constants: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        var a = 5 ** NaN;
-        /* NaN exponent results to NaN */
-        var b = 42 ** +0;
-        /* +0 exponent results to NaN */
-        var c = 42 ** -0;
-        /* -0 exponent results to NaN */
-        var d = NaN ** 1;
-        /* NaN with non-zero exponent is NaN */
-        var e = 2 ** Infinity;
-        /* abs(base) > 1 with Infinity as exponent is Infinity */
-        var f = 2 ** -Infinity;
-        /* abs(base) > 1 with -Infinity as exponent is +0 */
-        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);
-        var m = 3 ** -10;  // Result will be 0.000016935087808430286, which is too long
-    }
-    expect: {
-        var a = NaN;
-        var b = 1;
-        var c = 1;
-        var d = NaN;
-        var e = 1/0;
-        var f = 0;
-        var g = NaN;
-        var h = 1/0;
-        var i = -1/0;
-        var j = .125;
-        var k = .125;
-        var l = .25;
-        var m = 3 ** -10;
-    }
-}
-
 unsafe_constant: {
     options = {
         evaluate  : true,
@@ -767,16 +673,17 @@ call_args: {
         inline: true,
         reduce_funcs: true,
         reduce_vars: true,
+        toplevel: true,
     }
     input: {
-        const a = 1;
+        var a = 1;
         console.log(a);
         +function(a) {
             return a;
         }(a);
     }
     expect: {
-        const a = 1;
+        var a = 1;
         console.log(1);
         +(1, 1);
     }
@@ -790,17 +697,17 @@ call_args_drop_param: {
         keep_fargs: false,
         reduce_funcs: true,
         reduce_vars: true,
+        toplevel: true,
         unused: true,
     }
     input: {
-        const a = 1;
+        var a = 1;
         console.log(a);
         +function(a) {
             return a;
         }(a, b);
     }
     expect: {
-        const a = 1;
         console.log(1);
         +(b, 1);
     }
@@ -838,7 +745,7 @@ in_boolean_context: {
             !b("foo"),
             !b([1, 2]),
             !b(/foo/),
-            ![1, foo()],
+            (foo(), !1),
             (foo(), !1)
         );
     }
@@ -1287,6 +1194,9 @@ issue_2231_1: {
         console.log(Object.keys(void 0));
     }
     expect_stdout: true
+    expect_warnings: [
+        "WARN: Error evaluating Object.keys(void 0) [test/compress/evaluate.js:1191,20]",
+    ]
 }
 
 issue_2231_2: {
@@ -1301,6 +1211,23 @@ issue_2231_2: {
         console.log(Object.getOwnPropertyNames(null));
     }
     expect_stdout: true
+    expect_warnings: [
+        "WARN: Error evaluating Object.getOwnPropertyNames(null) [test/compress/evaluate.js:1208,20]",
+    ]
+}
+
+issue_2231_3: {
+    options = {
+        evaluate: true,
+        unsafe: true,
+    }
+    input: {
+        console.log(Object.keys({ foo: "bar" })[0]);
+    }
+    expect: {
+        console.log("foo");
+    }
+    expect_stdout: "foo"
 }
 
 self_comparison_1: {
@@ -1423,13 +1350,259 @@ issue_2535_3: {
     }
     expect_stdout: true
     expect_warnings: [
-        "WARN: Dropping side-effect-free && [test/compress/evaluate.js:1409,20]",
-        "WARN: Dropping side-effect-free && [test/compress/evaluate.js:1410,20]",
-        "WARN: Dropping side-effect-free && [test/compress/evaluate.js:1411,20]",
-        "WARN: Condition left of && always false [test/compress/evaluate.js:1411,20]",
-        "WARN: Dropping side-effect-free || [test/compress/evaluate.js:1412,20]",
-        "WARN: Dropping side-effect-free || [test/compress/evaluate.js:1413,20]",
-        "WARN: Dropping side-effect-free || [test/compress/evaluate.js:1414,20]",
-        "WARN: Condition left of || always true [test/compress/evaluate.js:1414,20]",
+        "WARN: Dropping side-effect-free && [test/compress/evaluate.js:1336,20]",
+        "WARN: Dropping side-effect-free && [test/compress/evaluate.js:1337,20]",
+        "WARN: Dropping side-effect-free && [test/compress/evaluate.js:1338,20]",
+        "WARN: Condition left of && always false [test/compress/evaluate.js:1338,20]",
+        "WARN: Dropping side-effect-free || [test/compress/evaluate.js:1339,20]",
+        "WARN: Dropping side-effect-free || [test/compress/evaluate.js:1340,20]",
+        "WARN: Dropping side-effect-free || [test/compress/evaluate.js:1341,20]",
+        "WARN: Condition left of || always true [test/compress/evaluate.js:1341,20]",
     ]
 }
+
+issue_2822: {
+    options = {
+        evaluate: true,
+        unsafe: true,
+    }
+    input: {
+        console.log([ function() {}, "PASS", "FAIL" ][1]);
+    }
+    expect: {
+        console.log("PASS");
+    }
+    expect_stdout: "PASS"
+}
+
+string_case: {
+    options = {
+        evaluate: true,
+        unsafe: true,
+    }
+    input: {
+        console.log("İ".toLowerCase().charCodeAt(0));
+        console.log("I".toLowerCase().charCodeAt(0));
+        console.log("Ş".toLowerCase().charCodeAt(0));
+        console.log("Ğ".toLowerCase().charCodeAt(0));
+        console.log("Ü".toLowerCase().charCodeAt(0));
+        console.log("Ö".toLowerCase().charCodeAt(0));
+        console.log("Ç".toLowerCase().charCodeAt(0));
+        console.log("i".toUpperCase().charCodeAt(0));
+        console.log("ı".toUpperCase().charCodeAt(0));
+        console.log("ş".toUpperCase().charCodeAt(0));
+        console.log("ğ".toUpperCase().charCodeAt(0));
+        console.log("ü".toUpperCase().charCodeAt(0));
+        console.log("ö".toUpperCase().charCodeAt(0));
+        console.log("ç".toUpperCase().charCodeAt(0));
+    }
+    expect: {
+        console.log(105);
+        console.log(105);
+        console.log(351);
+        console.log(287);
+        console.log(252);
+        console.log(246);
+        console.log(231);
+        console.log(73);
+        console.log(73);
+        console.log(350);
+        console.log(286);
+        console.log(220);
+        console.log(214);
+        console.log(199);
+    }
+    expect_stdout: [
+        "105",
+        "105",
+        "351",
+        "287",
+        "252",
+        "246",
+        "231",
+        "73",
+        "73",
+        "350",
+        "286",
+        "220",
+        "214",
+        "199",
+    ]
+}
+
+issue_2916_1: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        unsafe: true,
+    }
+    input: {
+        var c = "PASS";
+        (function(a, b) {
+            (function(d) {
+                d[0] = 1;
+            })(b);
+            a == b && (c = "FAIL");
+        })("", []);
+        console.log(c);
+    }
+    expect: {
+        var c = "PASS";
+        (function(a, b) {
+            (function(d) {
+                d[0] = 1;
+            })(b);
+            a == b && (c = "FAIL");
+        })("", []);
+        console.log(c);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_2916_2: {
+    options = {
+        collapse_vars: true,
+        evaluate: true,
+        inline: true,
+        reduce_vars: true,
+        side_effects: true,
+        unsafe: true,
+        unused: true,
+    }
+    input: {
+        var c = "FAIL";
+        (function(b) {
+            (function(d) {
+                d[0] = 1;
+            })(b);
+            +b && (c = "PASS");
+        })([]);
+        console.log(c);
+    }
+    expect: {
+        var c = "FAIL";
+        (function(b) {
+            b[0] = 1;
+            +b && (c = "PASS");
+        })([]);
+        console.log(c);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_2919: {
+    options = {
+        evaluate: true,
+        unsafe: true,
+    }
+    input: {
+        console.log([ function() {} ].toString());
+    }
+    expect: {
+        console.log("function(){}");
+    }
+}
+
+issue_2926_1: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        unsafe: true,
+    }
+    input: {
+        (function f(a) {
+            console.log(f.name.length, f.length);
+        })();
+    }
+    expect: {
+        (function f(a) {
+            console.log(1, 1);
+        })();
+    }
+    expect_stdout: "1 1"
+}
+
+issue_2926_2: {
+    options = {
+        evaluate: true,
+        unsafe: true,
+    }
+    input: {
+        console.log(typeof function() {}.valueOf());
+    }
+    expect: {
+        console.log("function");
+    }
+    expect_stdout: "function"
+}
+
+issue_2968: {
+    options = {
+        collapse_vars: true,
+        evaluate: true,
+        inline: true,
+        passes: 2,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        var c = "FAIL";
+        (function() {
+            (function(a, b) {
+                a <<= 0;
+                a && (a[(c = "PASS", 0 >>> (b += 1))] = 0);
+            })(42, -42);
+        })();
+        console.log(c);
+    }
+    expect: {
+        var c = "FAIL";
+        (function() {
+            b = -(a = 42),
+            void ((a <<= 0) && (a[(c = "PASS", 0 >>> (b += 1))] = 0));
+            var a, b;
+        })();
+        console.log(c);
+    }
+    expect_stdout: "PASS"
+}
+
+truthy_conditionals: {
+    options = {
+        conditionals: true,
+        evaluate: true,
+    }
+    input: {
+        if (a = {}) x();
+        (b = /foo/) && y();
+        (c = function() {}) || z();
+    }
+    expect: {
+        a = {}, x();
+        b = /foo/, y();
+        c = function() {};
+    }
+}
+
+truthy_loops: {
+    options = {
+        evaluate: true,
+        loops: true,
+    }
+    input: {
+        while ([]) x();
+        do {
+            y();
+        } while(a = {});
+    }
+    expect: {
+        for (;;) {
+            [];
+            x();
+        }
+        for (;;) {
+            y();
+            a = {};
+        }
+    }
+}

test/compress/expansions.js

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

test/compress/export.js

@@ -1,264 +0,0 @@
-issue_2038_1: {
-    options = {
-        toplevel: true,
-        unused: true,
-    }
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        export var V = 1;
-        export let L = 2;
-        export const C = 3;
-    }
-    expect: {
-        export var V = 1;
-        export let L = 2;
-        export const C = 3;
-    }
-}
-
-issue_2038_2: {
-    options = {
-        toplevel: true,
-        unused: true,
-    }
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        let LET = 1;
-        const CONST = 2;
-        var VAR = 3;
-        export { LET, CONST, VAR };
-    }
-    expect: {
-        let t = 1;
-        const e = 2;
-        var o = 3;
-        export { t as LET, e as CONST, o as VAR };
-    }
-}
-
-issue_2126: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        import { foo as bar, cat as dog } from "stuff";
-        console.log(bar, dog);
-        export { bar as qux };
-        export { dog };
-    }
-    expect: {
-        import { foo as o, cat as s } from "stuff";
-        console.log(o, s);
-        export { o as qux };
-        export { s as dog };
-    }
-}
-
-beautify: {
-    beautify = {
-        beautify: true,
-    }
-    input: {
-        export { A as B, C as D };
-    }
-    expect_exact: "export { A as B, C as D };"
-}
-
-issue_2131: {
-    options = {
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        function no() {
-            console.log(42);
-        }
-        function go() {
-            console.log(42);
-        }
-        var X = 1, Y = 2;
-        export function main() {
-            go(X);
-        };
-    }
-    expect: {
-        function go() {
-            console.log(42);
-        }
-        var X = 1;
-        export function main() {
-            go(X);
-        };
-    }
-}
-
-issue_2129: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        export const { keys } = Object;
-    }
-    expect: {
-        export const { keys } = Object;
-    }
-}
-
-async_func: {
-    options = {
-        keep_fargs: false,
-        unused: true,
-    }
-    input: {
-        export async function Foo(x){};
-    }
-    expect: {
-        export async function Foo(){};
-    }
-}
-
-issue_2134_1: {
-    options = {
-        keep_fargs: false,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        export function Foo(x){};
-        Foo.prototype = {};
-    }
-    expect: {
-        export function Foo(){};
-        Foo.prototype = {};
-    }
-}
-
-issue_2134_2: {
-    options = {
-        keep_fargs: false,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        export async function Foo(x){};
-        Foo.prototype = {};
-    }
-    expect: {
-        export async function Foo(){};
-        Foo.prototype = {};
-    }
-}
-
-redirection: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        let foo = 1, bar = 2;
-        export { foo as delete };
-        export { bar as default };
-        export { foo as var } from "module.js";
-    }
-    expect: {
-        let e = 1, o = 2;
-        export { e as delete };
-        export { o as default };
-        export { foo as var } from "module.js";
-    }
-}
-
-keyword_invalid_1: {
-    input: {
-        export { default };
-    }
-    expect: {
-        export { default };
-    }
-}
-
-keyword_invalid_2: {
-    input: {
-        export { default as Alias };
-    }
-    expect: {
-        export { default as Alias };
-    }
-}
-
-keyword_invalid_3: {
-    input: {
-        export { default as default };
-    }
-    expect: {
-        export { default as default };
-    }
-}
-
-keyword_valid_1: {
-    input: {
-        export { default } from "module.js";
-    }
-    expect: {
-        export { default } from "module.js";
-    }
-}
-
-keyword_valid_2: {
-    input: {
-        export { default as Alias } from "module.js";
-    }
-    expect: {
-        export { default as Alias } from "module.js";
-    }
-}
-
-keyword_valid_3: {
-    input: {
-        export { default as default } from "module.js";
-    }
-    expect: {
-        export { default as default } from "module.js";
-    }
-}
-
-dynamic_import: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        import traditional from './traditional.js';
-        function imp(x) {
-            return import(x);
-        }
-        import("module_for_side_effects.js");
-        let dynamic = import("some/module.js");
-        dynamic.foo();
-    }
-    expect: {
-        import o from "./traditional.js";
-        function t(o) {
-            return import(o);
-        }
-        import("module_for_side_effects.js");
-        let r = import("some/module.js");
-        r.foo();
-    }
-}
-
-trailing_comma: {
-    beautify = {
-        beautify: true,
-    }
-    input: {
-        export const a = 1;
-    }
-    expect_exact: "export const a = 1;"
-}

test/compress/expression.js

@@ -1,52 +0,0 @@
-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

@@ -121,7 +121,7 @@ mixed: {
         properties: true,
     }
     input: {
-        const FOO = { BAR: 0 };
+        var FOO = { BAR: 0 };
         console.log(FOO.BAR);
         console.log(++CONFIG.DEBUG);
         console.log(++CONFIG.VALUE);
@@ -131,7 +131,7 @@ mixed: {
         console.log(CONFIG);
     }
     expect: {
-        const FOO = { BAR: 0 };
+        var FOO = { BAR: 0 };
         console.log("moo");
         console.log(++CONFIG.DEBUG);
         console.log(++CONFIG.VALUE);

test/compress/hoist.js

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

test/compress/hoist_props.js

@@ -55,9 +55,8 @@ issue_2377_2: {
         console.log(obj.foo, obj.cube(3));
     }
     expect: {
-        console.log(1, function(x) {
-            return x * x * x;
-        }(3));
+        console.log(1, (x = 3, x * x * x));
+        var x;
     }
     expect_stdout: "1 27"
 }
@@ -67,9 +66,10 @@ issue_2377_3: {
         evaluate: true,
         inline: true,
         hoist_props: true,
-        passes: 3,
+        passes: 4,
         reduce_funcs: true,
         reduce_vars: true,
+        side_effects: true,
         toplevel: true,
         unused: true,
     }
@@ -239,14 +239,14 @@ name_collision_2: {
     input: {
         var o = {
             p: 1,
-            0: function(x) {
+            "+": function(x) {
                 return x;
             },
-            1: function(x) {
+            "-": function(x) {
                 return x + 1;
             }
         }, o__$0 = 2, o__$1 = 3;
-        console.log(o.p === o.p, o[0](4), o[1](5), o__$0, o__$1);
+        console.log(o.p === o.p, o["+"](4), o["-"](5), o__$0, o__$1);
     }
     expect: {
         var o_p = 1,
@@ -273,14 +273,14 @@ name_collision_3: {
     input: {
         var o = {
             p: 1,
-            0: function(x) {
+            "+": function(x) {
                 return x;
             },
-            1: function(x) {
+            "-": function(x) {
                 return x + 1;
             }
         }, o__$0 = 2, o__$1 = 3;
-        console.log(o.p === o.p, o[0](4), o[1](5));
+        console.log(o.p === o.p, o["+"](4), o["-"](5));
     }
     expect: {
         var o_p = 1,
@@ -383,120 +383,6 @@ contains_this_3: {
     expect_stdout: "1 1 true"
 }
 
-hoist_class: {
-    options = {
-        comparisons: true,
-        evaluate: true,
-        hoist_props: true,
-        inline: true,
-        keep_classnames: true,
-        keep_fnames: true,
-        passes: 2,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        function run(c, v) {
-            return new c(v).value;
-        }
-        var o = {
-            p: class Foo {
-                constructor(value) {
-                    this.value = value * 10;
-                }
-            },
-            x: 1,
-            y: 2,
-        };
-        console.log(o.p.name, o.p === o.p, run(o.p, o.x), run(o.p, o.y));
-    }
-    expect: {
-        function run(c, v) {
-            return new c(v).value;
-        }
-        var o_p = class Foo {
-            constructor(value) {
-                this.value = 10 * value;
-            }
-        };
-        console.log(o_p.name, true, run(o_p, 1), run(o_p, 2));
-    }
-    node_version: ">=6"
-    expect_stdout: "Foo true 10 20"
-}
-
-hoist_class_with_new: {
-    options = {
-        comparisons: true,
-        evaluate: true,
-        hoist_props: true,
-        inline: true,
-        keep_classnames: true,
-        keep_fnames: true,
-        passes: 2,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var o = {
-            p: class Foo {
-                constructor(value) {
-                    this.value = value * 10;
-                }
-            },
-            x: 1,
-            y: 2,
-        };
-        console.log(o.p.name, o.p === o.p, new o.p(o.x).value, new o.p(o.y).value);
-    }
-    expect: {
-        var o_p = class Foo {
-            constructor(value) {
-                this.value = 10 * value;
-            }
-        };
-        console.log(o_p.name, true, new o_p(1).value, new o_p(2).value);
-    }
-    node_version: ">=6"
-    expect_stdout: "Foo true 10 20"
-}
-
-hoist_function_with_call: {
-    options = {
-        comparisons: true,
-        evaluate: true,
-        hoist_props: true,
-        inline: true,
-        keep_fnames: true,
-        passes: 2,
-        reduce_funcs: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var o = {
-            p: function Foo(value) {
-                return 10 * value;
-            },
-            x: 1,
-            y: 2
-        };
-        console.log(o.p.name, o.p === o.p, o.p(o.x), o.p(o.y));
-    }
-    expect: {
-        var o_p = function Foo(value){
-            return 10 * value
-        };
-        console.log(o_p.name, true, o_p(1), o_p(2));
-    }
-    expect_stdout: "Foo true 10 20"
-}
-
 new_this: {
     options = {
         evaluate: true,
@@ -526,26 +412,6 @@ new_this: {
     expect_stdout: "1 2"
 }
 
-issue_2462: {
-    options = {
-        hoist_props: true,
-        reduce_funcs: true,
-        reduce_vars: true,
-    }
-    input: {
-        export const Foo = {
-            a: 1,
-            b: () => 2
-        };
-    }
-    expect: {
-        export const Foo = {
-            a: 1,
-            b: () => 2
-        };
-    }
-}
-
 issue_2473_1: {
     options = {
         hoist_props: false,
@@ -768,31 +634,6 @@ issue_2508_5: {
     expect_stdout: true
 }
 
-issue_2508_6: {
-    options = {
-        collapse_vars: true,
-        hoist_props: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var o = {
-            f: x => {
-                console.log(x);
-            }
-        };
-        o.f(o.f);
-    }
-    expect: {
-        var o_f = x => {
-            console.log(x);
-        };
-        o_f(o_f);
-    }
-    expect_stdout: true
-}
-
 issue_2519: {
     options = {
         collapse_vars: true,
@@ -823,3 +664,195 @@ issue_2519: {
     }
     expect_stdout: "5.5"
 }
+
+undefined_key: {
+    options = {
+        evaluate: true,
+        hoist_props: true,
+        join_vars: true,
+        passes: 4,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a, o = {};
+        o[a] = 1;
+        o.b = 2;
+        console.log(o[a] + o.b);
+    }
+    expect: {
+        console.log(3);
+    }
+    expect_stdout: "3"
+}
+
+issue_3021: {
+    options = {
+        hoist_props: true,
+        reduce_vars: true,
+    }
+    input: {
+        var a = 1, b = 2;
+        (function() {
+            b = a;
+            if (a++ + b--)
+                return 1;
+            return;
+            var b = {};
+        })();
+        console.log(a, b);
+    }
+    expect: {
+        var a = 1, b = 2;
+        (function() {
+            b = a;
+            if (a++ + b--)
+                return 1;
+            return;
+            var b = {};
+        })();
+        console.log(a, b);
+    }
+    expect_stdout: "2 2"
+}
+
+issue_3046: {
+    options = {
+        hoist_props: true,
+        reduce_vars: true,
+    }
+    input: {
+        console.log(function(a) {
+            do {
+                var b = {
+                    c: a++
+                };
+            } while (b.c && a);
+            return a;
+        }(0));
+    }
+    expect: {
+        console.log(function(a) {
+            do {
+                var b_c = a++;
+            } while (b_c && a);
+            return a;
+        }(0));
+    }
+    expect_stdout: "1"
+}
+
+issue_3071_1: {
+    options = {
+        evaluate: true,
+        inline: true,
+        join_vars: true,
+        hoist_props: true,
+        passes: 3,
+        reduce_vars: true,
+        sequences: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        (function() {
+            var obj = {};
+            obj.one = 1;
+            obj.two = 2;
+            console.log(obj.one);
+        })();
+    }
+    expect: {
+        console.log(1);
+    }
+    expect_stdout: "1"
+}
+
+issue_3071_2: {
+    options = {
+        evaluate: true,
+        inline: true,
+        join_vars: true,
+        hoist_props: true,
+        passes: 3,
+        reduce_vars: true,
+        sequences: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        (function() {
+            obj = {};
+            obj.one = 1;
+            obj.two = 2;
+            console.log(obj.one);
+            var obj;
+        })();
+    }
+    expect: {
+        console.log(1);
+    }
+    expect_stdout: "1"
+}
+
+issue_3071_2_toplevel: {
+    options = {
+        evaluate: true,
+        inline: true,
+        join_vars: true,
+        hoist_props: true,
+        passes: 3,
+        reduce_vars: true,
+        sequences: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        (function() {
+            obj = {};
+            obj.one = 1;
+            obj.two = 2;
+            console.log(obj.one);
+            var obj;
+        })();
+    }
+    expect: {
+        console.log(1);
+    }
+    expect_stdout: "1"
+}
+
+issue_3071_3: {
+    options = {
+        hoist_props: true,
+        reduce_vars: true,
+    }
+    input: {
+        var c = 0;
+        (function(a, b) {
+            (function f(o) {
+                var n = 2;
+                while (--b + (o = {
+                    p: c++,
+                }) && --n > 0);
+            })();
+        })();
+        console.log(c);
+    }
+    expect: {
+        var c = 0;
+        (function(a, b) {
+            (function f(o) {
+                var n = 2;
+                while (--b + (o = {
+                    p: c++,
+                }) && --n > 0);
+            })();
+        })();
+        console.log(c);
+    }
+    expect_stdout: "2"
+}

test/compress/html_comments.js

@@ -53,12 +53,3 @@ html_comment_in_string_literal: {
     }
     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/ie8.js

@@ -102,12 +102,12 @@ dont_screw_try_catch: {
         };
     }
     expect: {
-        bad = function(n){
-            return function(t){
+        bad = function(t){
+            return function(n){
                 try{
-                    n()
-                } catch(n) {
-                    t(n)
+                    t()
+                } catch(t) {
+                    n(t)
                 }
             }
         };
@@ -349,11 +349,11 @@ issue_2254_1: {
         try {
             console.log(f("PASS"));
         } catch (e) {}
-        function f(e) {
+        function f(t) {
             try {
                 throw "FAIL";
-            } catch (t) {
-                return e;
+            } catch (e) {
+                return t;
             }
         }
     }
@@ -392,3 +392,149 @@ issue_2254_2: {
     }
     expect_stdout: "PASS"
 }
+
+issue_24_1: {
+    mangle = {
+        ie8: false,
+    }
+    input: {
+        (function(a) {
+            console.log(typeof function f(){} === typeof a ? "FAIL" : "PASS");
+        })();
+    }
+    expect: {
+        (function(o) {
+            console.log(typeof function o(){} === typeof o ? "FAIL" : "PASS");
+        })();
+    }
+    expect_stdout: "PASS"
+}
+
+issue_24_2: {
+    mangle = {
+        ie8: true,
+    }
+    input: {
+        (function(a) {
+            console.log(typeof function f(){} === typeof a ? "FAIL" : "PASS");
+        })();
+    }
+    expect: {
+        (function(n) {
+            console.log(typeof function o(){} === typeof n ? "FAIL" : "PASS");
+        })();
+    }
+    expect_stdout: "PASS"
+}
+
+issue_2976_1: {
+    mangle = {
+        ie8: false,
+    }
+    input: {
+        console.log(function f() {
+            var a;
+            return a === f ? "FAIL" : "PASS";
+        }());
+    }
+    expect: {
+        console.log(function n() {
+            var o;
+            return o === n ? "FAIL" : "PASS";
+        }());
+    }
+    expect_stdout: "PASS"
+}
+
+issue_2976_2: {
+    mangle = {
+        ie8: true,
+    }
+    input: {
+        console.log(function f() {
+            var a;
+            return a === f ? "FAIL" : "PASS";
+        }());
+    }
+    expect: {
+        console.log(function n() {
+            var o;
+            return o === n ? "FAIL" : "PASS";
+        }());
+    }
+    expect_stdout: "PASS"
+}
+
+issue_3035: {
+    mangle = {
+        ie8: false,
+    }
+    input: {
+        var c = "FAIL";
+        (function(a) {
+            try {
+                throw 1;
+            } catch (b) {
+                try {
+                    throw 0;
+                } catch (a) {
+                    b && (c = "PASS");
+                }
+            }
+        })();
+        console.log(c);
+    }
+    expect: {
+        var c = "FAIL";
+        (function(o) {
+            try {
+                throw 1;
+            } catch (t) {
+                try {
+                    throw 0;
+                } catch (o) {
+                    t && (c = "PASS");
+                }
+            }
+        })();
+        console.log(c);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_3035_ie8: {
+    mangle = {
+        ie8: true,
+    }
+    input: {
+        var c = "FAIL";
+        (function(a) {
+            try {
+                throw 1;
+            } catch (b) {
+                try {
+                    throw 0;
+                } catch (a) {
+                    b && (c = "PASS");
+                }
+            }
+        })();
+        console.log(c);
+    }
+    expect: {
+        var c = "FAIL";
+        (function(t) {
+            try {
+                throw 1;
+            } catch (o) {
+                try {
+                    throw 0;
+                } catch (t) {
+                    o && (c = "PASS");
+                }
+            }
+        })();
+        console.log(c);
+    }
+    expect_stdout: "PASS"
+}

test/compress/if_return.js

@@ -243,7 +243,7 @@ issue_1089: {
     expect: {
         function x() {
             var f = document.getElementById("fname");
-            if (f.files[0].size > 12345)
+            if (12345 < f.files[0].size)
                 return alert("alert"), f.focus(), !1;
         }
     }
@@ -327,60 +327,72 @@ issue_512: {
     }
 }
 
-issue_1317: {
+if_var_return: {
     options = {
+        conditionals: true,
         if_return: true,
+        join_vars: true,
+        sequences: true,
     }
     input: {
-        !function(a) {
-            if (a) return;
-            let b = 1;
-            function g() {
-                return b;
+        function f() {
+            var a;
+            return;
+            var b;
+        }
+        function g() {
+            var a;
+            if (u()) {
+                var b;
+                return v();
+                var c;
             }
-            console.log(g());
-        }();
+            var d;
+            if (w()) {
+                var e;
+                return x();
+                var f;
+            } else {
+                var g;
+                y();
+                var h;
+            }
+            var i;
+            z();
+            var j;
+        }
     }
     expect: {
-        !function(a) {
-            if (a) return;
-            let b = 1;
-            function g() {
-                return b;
-            }
-            console.log(g());
-        }();
+        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);
+        }
     }
-    expect_stdout: "1"
-    node_version: ">=6"
 }
 
-issue_1317_strict: {
+if_if_return_return: {
     options = {
+        conditionals: true,
         if_return: true,
     }
     input: {
-        "use strict";
-        !function(a) {
-            if (a) return;
-            let b = 1;
-            function g() {
-                return b;
+        function f(a, b) {
+            if (a) {
+                if (b)
+                    return b;
+                return;
             }
-            console.log(g());
-        }();
+            g();
+        }
     }
     expect: {
-        "use strict";
-        !function(a) {
-            if (a) return;
-            let b = 1;
-            function g() {
-                return b;
-            }
-            console.log(g());
-        }();
+        function f(a, b) {
+            if (a)
+                return b || void 0;
+            g();
+        }
     }
-    expect_stdout: "1"
-    node_version: ">=4"
 }

test/compress/issue-1001.js

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

test/compress/issue-1034.js

@@ -2,7 +2,7 @@ non_hoisted_function_after_return: {
     options = {
         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
+        if_return: true, join_vars: true, side_effects: true
     }
     input: {
         function foo(x) {
@@ -38,7 +38,7 @@ non_hoisted_function_after_return_2a: {
     options = {
         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,
+        if_return: true, join_vars: true, side_effects: true,
         collapse_vars: false, passes: 2, warnings: "verbose"
     }
     input: {
@@ -85,7 +85,7 @@ non_hoisted_function_after_return_2b: {
     options = {
         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,
+        if_return: true, join_vars: true, side_effects: true,
         collapse_vars: false
     }
     input: {
@@ -123,7 +123,7 @@ non_hoisted_function_after_return_strict: {
     options = {
         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
+        if_return: true, join_vars: true, side_effects: true
     }
     input: {
         "use strict";
@@ -164,7 +164,7 @@ non_hoisted_function_after_return_2a_strict: {
     options = {
         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,
+        if_return: true, join_vars: true, side_effects: true,
         collapse_vars: false, passes: 2, warnings: "verbose"
     }
     input: {
@@ -216,7 +216,7 @@ non_hoisted_function_after_return_2b_strict: {
     options = {
         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,
+        if_return: true, join_vars: true, side_effects: true,
         collapse_vars: false
     }
     input: {

test/compress/issue-1041.js

@@ -1,16 +1,3 @@
-const_declaration: {
-    options = {
-        evaluate: true
-    };
-
-    input: {
-        const goog = goog || {};
-    }
-    expect: {
-        const goog = goog || {};
-    }
-}
-
 const_pragma: {
     options = {
         evaluate: true,

test/compress/issue-1043.js

@@ -1,30 +0,0 @@
-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

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

test/compress/issue-1052.js

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

test/compress/issue-1105.js

@@ -190,7 +190,6 @@ assorted_Infinity_NaN_undefined_in_with_scope: {
         keep_fargs:    true,
         if_return:     true,
         join_vars:     true,
-        cascade:       true,
         side_effects:  true,
         sequences:     false,
         keep_infinity: false,
@@ -253,7 +252,6 @@ assorted_Infinity_NaN_undefined_in_with_scope_keep_infinity: {
         keep_fargs:    true,
         if_return:     true,
         join_vars:     true,
-        cascade:       true,
         side_effects:  true,
         sequences:     false,
         keep_infinity: true,

test/compress/issue-1212.js

@@ -1,76 +0,0 @@
-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

@@ -8,7 +8,6 @@ pure_function_calls: {
         unused       : true,
         if_return    : true,
         join_vars    : true,
-        cascade      : true,
         negate_iife  : true,
     }
     input: {
@@ -49,13 +48,13 @@ pure_function_calls: {
         a.b(), f.g();
     }
     expect_warnings: [
-        "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]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:16,8]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:16,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:29,37]",
+        "WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:29,16]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:27,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:37,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:38,31]",
     ]
 }
 
@@ -69,7 +68,6 @@ pure_function_calls_toplevel: {
         unused       : true,
         if_return    : true,
         join_vars    : true,
-        cascade      : true,
         negate_iife  : true,
         toplevel     : true,
     }
@@ -112,17 +110,17 @@ pure_function_calls_toplevel: {
         a.b(), f.g();
     }
     expect_warnings: [
-        "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]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:77,8]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:77,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:90,37]",
+        "WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:90,16]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:88,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:105,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:106,31]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:82,33]",
+        "WARN: Dropping unused variable iife1 [test/compress/issue-1261.js:82,12]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:98,45]",
+        "WARN: Dropping unused variable MyClass [test/compress/issue-1261.js:98,12]",
     ]
 }
 
@@ -157,29 +155,29 @@ should_warn: {
         baz();
     }
     expect_warnings: [
-        "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:135,61]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:135,23]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:135,23]",
+        "WARN: Boolean || always true [test/compress/issue-1261.js:136,23]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:136,23]",
+        "WARN: Condition always true [test/compress/issue-1261.js:136,23]",
+        "WARN: Condition left of || always true [test/compress/issue-1261.js:137,8]",
+        "WARN: Condition always true [test/compress/issue-1261.js:137,8]",
+        "WARN: Boolean && always false [test/compress/issue-1261.js:138,23]",
         "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:138,23]",
-        "WARN: Condition always 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: Condition always false [test/compress/issue-1261.js:138,23]",
+        "WARN: Condition left of && always false [test/compress/issue-1261.js:139,8]",
+        "WARN: Condition always false [test/compress/issue-1261.js:139,8]",
+        "WARN: + in boolean context always true [test/compress/issue-1261.js:140,23]",
         "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:140,23]",
-        "WARN: Condition always 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: Condition always true [test/compress/issue-1261.js:140,23]",
+        "WARN: + in boolean context always true [test/compress/issue-1261.js:141,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:141,31]",
+        "WARN: Condition always true [test/compress/issue-1261.js:141,8]",
         "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:142,23]",
-        "WARN: 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]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:143,24]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:144,31]",
+        "WARN: Condition always false [test/compress/issue-1261.js:144,8]",
     ]
 }

test/compress/issue-1275.js

@@ -9,7 +9,6 @@ string_plus_optimization: {
         unused        : true,
         if_return     : true,
         join_vars     : true,
-        cascade       : true,
         hoist_funs    : true,
     };
     input: {

test/compress/issue-1443.js

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

test/compress/issue-1447.js

@@ -32,7 +32,6 @@ conditional_false_stray_else_in_loop: {
         hoist_vars   : true,
         join_vars    : true,
         if_return    : true,
-        cascade      : true,
         conditionals : false,
     }
     input: {

test/compress/issue-1466.js

@@ -1,291 +0,0 @@
-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: true,
+        unsafe_undefined: true,
     }
     mangle = {}
     input: {
@@ -85,15 +85,3 @@ 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-1639.js

@@ -2,7 +2,7 @@
 issue_1639_1: {
     options = {
         booleans: true,
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         evaluate: true,
         join_vars: true,
@@ -35,7 +35,7 @@ issue_1639_1: {
 issue_1639_2: {
     options = {
         booleans: true,
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         evaluate: true,
         join_vars: true,
@@ -68,7 +68,7 @@ issue_1639_2: {
 issue_1639_3: {
     options = {
         booleans: true,
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         evaluate: true,
         sequences: true,

test/compress/issue-1656.js

@@ -1,7 +1,6 @@
 f7: {
     options = {
         booleans: true,
-        cascade: true,
         collapse_vars: true,
         comparisons: true,
         conditionals: true,

test/compress/issue-1704.js

@@ -104,7 +104,7 @@ mangle_catch_toplevel: {
         }
         console.log(a);
     }
-    expect_exact: 'var o="FAIL";try{throw 1}catch(c){o="PASS"}console.log(o);'
+    expect_exact: 'var c="FAIL";try{throw 1}catch(o){c="PASS"}console.log(c);'
     expect_stdout: "PASS"
 }
 
@@ -148,7 +148,7 @@ mangle_catch_var_toplevel: {
         }
         console.log(a);
     }
-    expect_exact: 'var o="FAIL";try{throw 1}catch(r){var o="PASS"}console.log(o);'
+    expect_exact: 'var r="FAIL";try{throw 1}catch(o){var r="PASS"}console.log(r);'
     expect_stdout: "PASS"
 }
 
@@ -345,3 +345,95 @@ 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: "PASS"
+}
+
+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: "PASS"
+}
+
+mangle_catch_redef_ie8_3: {
+    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: "PASS"
+}
+
+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: "PASS"
+}

test/compress/issue-1733.js

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

test/compress/issue-1770.js

@@ -84,12 +84,12 @@ numeric_literal: {
         '    0: 0,',
         '    "-0": 1,',
         '    42: 2,',
-        '    "42": 3,',
+        '    42: 3,',
         '    37: 4,',
         '    o: 5,',
         '    1e42: 6,',
         '    b: 7,',
-        '    "1e+42": 8',
+        '    1e42: 8',
         '};',
         '',
         'console.log(obj[-0], obj[-""], obj["-0"]);',
@@ -107,3 +107,139 @@ 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-2001.js

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

test/compress/issue-203.js

@@ -1,57 +0,0 @@
-
-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

@@ -38,7 +38,7 @@ mixed: {
         }
     }
     input: {
-        const ENV = 3;
+        var ENV = 3;
         var FOO = 4;
         f(ENV * 10);
         --FOO;
@@ -49,7 +49,7 @@ mixed: {
         x = DEBUG;
     }
     expect: {
-        const ENV = 3;
+        var ENV = 3;
         var FOO = 4;
         f(10);
         --FOO;
@@ -60,7 +60,7 @@ mixed: {
         x = 0;
     }
     expect_warnings: [
-        'WARN: global_defs ENV redefined [test/compress/issue-208.js:41,14]',
+        'WARN: global_defs ENV redefined [test/compress/issue-208.js:41,12]',
         '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]',

test/compress/issue-2652.js

@@ -0,0 +1,33 @@
+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-269.js

@@ -64,3 +64,27 @@ strings_concat: {
 		);
 	}
 }
+
+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:78,2]',
+	]
+}

test/compress/issue-2719.js

@@ -0,0 +1,32 @@
+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.protoype.caller not supported [test/compress/issue-2719.js:17,19]",
+        "WARN: Function.protoype.arguments not supported [test/compress/issue-2719.js:17,19]",
+    ]
+}

test/compress/issue-281.js

@@ -453,7 +453,7 @@ pure_annotation_2: {
 
 drop_fargs: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         inline: true,
         keep_fargs: false,
         side_effects: true,
@@ -476,7 +476,7 @@ drop_fargs: {
 
 keep_fargs: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         inline: true,
         keep_fargs: true,
         side_effects: true,

test/compress/issue-2871.js

@@ -0,0 +1,37 @@
+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

@@ -0,0 +1,21 @@
+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 = {
-        cascade: true,
+        collapse_vars: 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 b = c(), 'stirng' == typeof ('function' === typeof b ? b() : b) && d();
+            return 'stirng' == typeof ('function' === typeof (b = c()) ? b() : b) && d();
         }
         function f3(c) {
             var a;

test/compress/issue-782.js

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

test/compress/issue-892.js

@@ -18,7 +18,6 @@ dont_mangle_arguments: {
         hoist_vars    : true,
         if_return     : true,
         join_vars     : true,
-        cascade       : true,
         side_effects  : true,
         negate_iife   : false
     };

test/compress/issue-926.js

@@ -1,9 +0,0 @@
-template_strings: {
-    input: {
-        foo(
-            `<span>${contents}</span>`,
-            `<a href="${url}">${text}</a>`
-        );
-    }
-    expect_exact: "foo(`<span>${contents}</span>`,`<a href=\"${url}\">${text}</a>`);"
-}

test/compress/issue-973.js

@@ -3,8 +3,9 @@ this_binding_conditionals: {
         conditionals: true,
         evaluate: true,
         side_effects: true,
-    };
+    }
     input: {
+        "use strict";
         (1 && a)();
         (0 || a)();
         (0 || 1 && a)();
@@ -26,6 +27,7 @@ this_binding_conditionals: {
         (1 ? eval : 0)();
     }
     expect: {
+        "use strict";
         a();
         a();
         a();
@@ -53,13 +55,15 @@ this_binding_collapse_vars: {
         collapse_vars: true,
         toplevel: true,
         unused: true,
-    };
+    }
     input: {
+        "use strict";
         var c = a; c();
         var d = a.b; d();
         var e = eval; e();
     }
     expect: {
+        "use strict";
         a();
         (0, a.b)();
         (0, eval)();
@@ -69,31 +73,88 @@ this_binding_collapse_vars: {
 this_binding_side_effects: {
     options = {
         side_effects : true
-    };
+    }
     input: {
-        (function (foo) {
+        (function(foo) {
             (0, foo)();
             (0, foo.bar)();
-            (0, eval)('console.log(foo);');
+            (0, eval)("console.log(foo);");
         }());
-        (function (foo) {
+        (function(foo) {
+            "use strict";
+            (0, foo)();
+            (0, foo.bar)();
+            (0, eval)("console.log(foo);");
+        }());
+        (function(foo) {
             var eval = console;
             (0, foo)();
             (0, foo.bar)();
-            (0, eval)('console.log(foo);');
+            (0, eval)("console.log(foo);");
         }());
     }
     expect: {
-        (function (foo) {
+        (function(foo) {
             foo();
             (0, foo.bar)();
-            (0, eval)('console.log(foo);');
+            eval("console.log(foo);");
         }());
-        (function (foo) {
+        (function(foo) {
+            "use strict";
+            foo();
+            (0, foo.bar)();
+            (0, eval)("console.log(foo);");
+        }());
+        (function(foo) {
             var eval = console;
             foo();
             (0, foo.bar)();
-            (0, eval)('console.log(foo);');
+            eval("console.log(foo);");
         }());
     }
-}
+}
+
+this_binding_sequences: {
+    options = {
+        sequences: true,
+        side_effects: true,
+    }
+    input: {
+        console.log(typeof function() {
+            return eval("this");
+        }());
+        console.log(typeof function() {
+            "use strict";
+            return eval("this");
+        }());
+        console.log(typeof function() {
+            return (0, eval)("this");
+        }());
+        console.log(typeof function() {
+            "use strict";
+            return (0, eval)("this");
+        }());
+    }
+    expect: {
+        console.log(typeof function() {
+            return eval("this");
+        }()),
+        console.log(typeof function() {
+            "use strict";
+            return eval("this");
+        }()),
+        console.log(typeof function() {
+            return eval("this");
+        }()),
+        console.log(typeof function() {
+            "use strict";
+            return (0, eval)("this");
+        }());
+    }
+    expect_stdout: [
+        "object",
+        "undefined",
+        "object",
+        "object",
+    ]
+}

test/compress/issue-976.js

@@ -2,7 +2,7 @@ eval_collapse_vars: {
     options = {
         collapse_vars:true, sequences:false, 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
+        keep_fargs:true, if_return:true, join_vars:true, side_effects:true
     };
     input: {
         function f1() {

test/compress/issue-979.js

@@ -2,7 +2,7 @@ issue979_reported: {
     options = {
         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
+        keep_fargs:true, if_return:true, join_vars:true, side_effects:true
     }
     input: {
         function f1() {
@@ -32,7 +32,7 @@ issue979_test_negated_is_best: {
     options = {
         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
+        keep_fargs:true, if_return:true, join_vars:true, side_effects:true
     }
     input: {
         function f3() {

test/compress/join-vars.js

@@ -1,40 +0,0 @@
-only_vars: {
-    options = { join_vars: true };
-    input: {
-        let netmaskBinary = '';
-        for (let i = 0; i < netmaskBits; ++i) {
-            netmaskBinary += '1';
-        }
-    }
-    expect: {
-        let netmaskBinary = '';
-        for (let i = 0; i < netmaskBits; ++i) netmaskBinary += '1';
-    }
-}
-
-issue_1079_with_vars: {
-    options = { join_vars: true };
-    input: {
-        var netmaskBinary = '';
-        for (var i = 0; i < netmaskBits; ++i) {
-            netmaskBinary += '1';
-        }
-    }
-    expect: {
-        for (var netmaskBinary = '', i = 0; i < netmaskBits; ++i) netmaskBinary += '1';
-    }
-}
-
-issue_1079_with_mixed: {
-    options = { join_vars: true };
-    input: {
-        var netmaskBinary = '';
-        for (let i = 0; i < netmaskBits; ++i) {
-            netmaskBinary += '1';
-        }
-    }
-    expect: {
-        var netmaskBinary = ''
-        for (let i = 0; i < netmaskBits; ++i) netmaskBinary += '1';
-    }
-}

test/compress/loops.js

@@ -146,50 +146,6 @@ parse_do_while_without_semicolon: {
     }
 }
 
-
-keep_collapse_const_in_own_block_scope: {
-    options = {
-        join_vars: true,
-        loops: true
-    }
-    input: {
-        var i=2;
-        const c=5;
-        while(i--)
-            console.log(i);
-        console.log(c);
-    }
-    expect: {
-        var i=2;
-        const c=5;
-        for(;i--;)
-            console.log(i);
-        console.log(c);
-    }
-    expect_stdout: true
-}
-
-keep_collapse_const_in_own_block_scope_2: {
-    options = {
-        join_vars: true,
-        loops: true
-    }
-    input: {
-        const c=5;
-        var i=2; // Moves to loop, while it did not in previous test
-        while(i--)
-            console.log(i);
-        console.log(c);
-    }
-    expect: {
-        const c=5;
-        for(var i=2;i--;)
-            console.log(i);
-        console.log(c);
-    }
-    expect_stdout: true
-}
-
 evaluate: {
     options = {
         dead_code: true,
@@ -338,10 +294,10 @@ issue_186_beautify_ie8: {
     ]
 }
 
-issue_186_bracketize: {
+issue_186_braces: {
     beautify = {
         beautify: false,
-        bracketize: true,
+        braces: true,
         ie8: false,
     }
     input: {
@@ -358,10 +314,10 @@ issue_186_bracketize: {
     expect_exact: 'var x=3;if(foo()){do{do{alert(x)}while(--x)}while(x)}else{bar()}'
 }
 
-issue_186_bracketize_ie8: {
+issue_186_braces_ie8: {
     beautify = {
         beautify: false,
-        bracketize: true,
+        braces: true,
         ie8: true,
     }
     input: {
@@ -378,10 +334,10 @@ issue_186_bracketize_ie8: {
     expect_exact: 'var x=3;if(foo()){do{do{alert(x)}while(--x)}while(x)}else{bar()}'
 }
 
-issue_186_beautify_bracketize: {
+issue_186_beautify_braces: {
     beautify = {
         beautify: true,
-        bracketize: true,
+        braces: true,
         ie8: false,
     }
     input: {
@@ -410,10 +366,10 @@ issue_186_beautify_bracketize: {
     ]
 }
 
-issue_186_beautify_bracketize_ie8: {
+issue_186_beautify_braces_ie8: {
     beautify = {
         beautify: true,
-        bracketize: true,
+        braces: true,
         ie8: true,
     }
     input: {
@@ -536,3 +492,133 @@ dead_code_condition: {
     }
     expect_stdout: "1"
 }
+
+issue_2740_1: {
+    options = {
+        dead_code: true,
+        loops: true,
+    }
+    input: {
+        for (; ; ) break;
+        for (a(); ; ) break;
+        for (; b(); ) break;
+        for (c(); d(); ) break;
+        for (; ; e()) break;
+        for (f(); ; g()) break;
+        for (; h(); i()) break;
+        for (j(); k(); l()) break;
+    }
+    expect: {
+        a();
+        b();
+        c();
+        d();
+        f();
+        h();
+        j();
+        k();
+    }
+}
+
+issue_2740_2: {
+    options = {
+        dead_code: true,
+        loops: true,
+        passes: 2,
+    }
+    input: {
+        L1: while (x()) {
+            break L1;
+        }
+    }
+    expect: {
+        x();
+    }
+}
+
+issue_2740_3: {
+    options = {
+        dead_code: true,
+        loops: true,
+    }
+    input: {
+        L1: for (var x = 0; x < 3; x++) {
+            L2: for (var y = 0; y < 2; y++) {
+                break L1;
+            }
+        }
+        console.log(x, y);
+    }
+    expect: {
+        L1: for (var x = 0; x < 3; x++)
+            for (var y = 0; y < 2; y++)
+                break L1;
+        console.log(x, y);
+    }
+    expect_stdout: "0 0"
+}
+
+issue_2740_4: {
+    options = {
+        dead_code: true,
+        loops: true,
+        passes: 2,
+    }
+    input: {
+        L1: for (var x = 0; x < 3; x++) {
+            L2: for (var y = 0; y < 2; y++) {
+                break L2;
+            }
+        }
+        console.log(x, y);
+    }
+    expect: {
+        for (var x = 0; x < 3; x++) {
+            var y = 0;
+            y < 2;
+        }
+        console.log(x, y);
+    }
+    expect_stdout: "3 0"
+}
+
+issue_2740_5: {
+    options = {
+        dead_code: true,
+        loops: true,
+        passes: 2,
+    }
+    input: {
+        L1: for (var x = 0; x < 3; x++) {
+            break L1;
+            L2: for (var y = 0; y < 2; y++) {
+                break L2;
+            }
+        }
+        console.log(x, y);
+    }
+    expect: {
+        var x = 0;
+        x < 3;
+        var y;
+        console.log(x,y);
+    }
+    expect_stdout: "0 undefined"
+}
+
+issue_2904: {
+    options = {
+        join_vars: true,
+        loops: true,
+    }
+    input: {
+        var a = 1;
+        do {
+            console.log(a);
+        } while (--a);
+    }
+    expect: {
+        for (var a = 1; console.log(a), --a;);
+    }
+    expect_stdout: "1"
+}

test/compress/max_line_len.js

@@ -8,14 +8,14 @@ too_short: {
         }
     }
     expect_exact: [
-        'function f(a){',
-        'return{',
-        'c:42,',
-        'd:a(),',
-        'e:"foo"}}',
+        "function f(",
+        "a){return{",
+        "c:42,d:a(",
+        '),e:"foo"}',
+        "}",
     ]
     expect_warnings: [
-        "WARN: Output exceeds 10 characters"
+        "WARN: Output exceeds 10 characters",
     ]
 }
 
@@ -29,11 +29,25 @@ just_enough: {
         }
     }
     expect_exact: [
-        'function f(a){',
-        'return{c:42,',
+        "function f(a){",
+        "return{c:42,",
         'd:a(),e:"foo"}',
-        '}',
-    ]
-    expect_warnings: [
+        "}",
     ]
+    expect_warnings: []
+}
+
+issue_304: {
+    beautify = {
+        max_line_len: 10,
+    }
+    input: {
+        var a = 0, b = 0, c = 0, d = 0, e = 0;
+    }
+    expect_exact: [
+        "var a=0,",
+        "b=0,c=0,",
+        "d=0,e=0;",
+    ]
+    expect_warnings: []
 }

test/compress/negate-iife.js

@@ -67,7 +67,7 @@ negate_iife_3_evaluate: {
         (function(){ return true })() ? console.log(true) : console.log(false);
     }
     expect: {
-        console.log(true);
+        true, console.log(true);
     }
     expect_stdout: true
 }
@@ -110,7 +110,7 @@ negate_iife_3_off_evaluate: {
         (function(){ return true })() ? console.log(true) : console.log(false);
     }
     expect: {
-        console.log(true);
+        true, console.log(true);
     }
     expect_stdout: true
 }

test/compress/new.js

@@ -83,22 +83,6 @@ new_with_unary_prefix: {
     expect_exact: 'var bar=(+new Date).toString(32);';
 }
 
-new_with_assignement_expression: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        var a;
-        new x(a = 5 * 2, b = [1, 2, 3], c = {a: "a", b: "b", cd: "c" + "d"});
-        new y([a, b] = [3, 4]);
-    }
-    expect: {
-        var a;
-        new x(a = 10, b = [1, 2, 3], c = {a: "a", b: "b", cd: "cd"});
-        new y([a, b] = [3, 4]);
-    }
-}
-
 dot_parenthesis_1: {
     input: {
         console.log(new (Math.random().constructor) instanceof Number);

test/compress/numbers.js

@@ -1,21 +1,49 @@
 hex_numbers_in_parentheses_for_prototype_functions: {
-    input: {
-        (-2);
-        (-2).toFixed(0);
-
-        (2);
-        (2).toFixed(0);
-
-        (0.2);
-        (0.2).toFixed(0);
-
-        (0.00000002);
-        (0.00000002).toFixed(0);
-
-        (1000000000000000128);
-        (1000000000000000128).toFixed(0);
+    beautify = {
+        beautify: true,
     }
-    expect_exact: "-2;(-2).toFixed(0);2;2..toFixed(0);.2;.2.toFixed(0);2e-8;2e-8.toFixed(0);0xde0b6b3a7640080;(0xde0b6b3a7640080).toFixed(0);"
+    input: {
+        function f() {
+            (-2);
+            (-2).toFixed(0);
+
+            (2);
+            (2).toFixed(0);
+
+            (0.2);
+            (0.2).toFixed(0);
+
+            (2.34e20);
+            (2.34e20).toFixed(0);
+
+            (0.00000002);
+            (0.00000002).toFixed(0);
+
+            (1000000000000000128);
+            (1000000000000000128).toFixed(0);
+
+            (-1000000000000000128);
+            (-1000000000000000128).toFixed(0);
+        }
+    }
+    expect_exact: [
+        "function f() {",
+        "    -2;",
+        "    (-2).toFixed(0);",
+        "    2;",
+        "    2..toFixed(0);",
+        "    .2;",
+        "    .2.toFixed(0);",
+        "    234e18;",
+        "    234e18.toFixed(0);",
+        "    2e-8;",
+        "    2e-8.toFixed(0);",
+        "    0xde0b6b3a7640080;",
+        "    (0xde0b6b3a7640080).toFixed(0);",
+        "    -0xde0b6b3a7640080;",
+        "    (-0xde0b6b3a7640080).toFixed(0);",
+        "}",
+    ]
 }
 
 comparisons: {

test/compress/parameters.js

@@ -1,186 +0,0 @@
-arrow_functions: {
-    options = {
-        arrows: true,
-    }
-    input: {
-        (a) => b;  // 1 args
-        (a, b) => c;  // n args
-        () => b;  // 0 args
-        (a) => (b) => c;  // func returns func returns func
-        (a) => ((b) => c);  // So these parens are dropped
-        () => (b,c) => d;  // func returns func returns func
-        a=>{return b;}
-        a => 'lel';  // Dropping the parens
-    }
-    expect_exact: "a=>b;(a,b)=>c;()=>b;a=>b=>c;a=>b=>c;()=>(b,c)=>d;a=>b;a=>\"lel\";"
-}
-
-arrow_return: {
-    options = {
-        arrows: true,
-    }
-    input: {
-        () => {};
-        () => { return; };
-        a => { return 1; }
-        a => { return -b }
-        a => { return b; var b; }
-        (x, y) => { return x - y; }
-    }
-    expect_exact: "()=>{};()=>{};a=>1;a=>-b;a=>{return b;var b};(x,y)=>x-y;"
-}
-
-regression_arrow_functions_and_hoist: {
-    options = {
-        hoist_vars: true,
-        hoist_funs: true
-    }
-    input: {
-        (a) => b;
-    }
-    expect_exact: "a=>b;"
-}
-
-regression_assign_arrow_functions: {
-    input: {
-        oninstall = e => false;
-        oninstall = () => false;
-    }
-    expect: {
-        oninstall=e=>false;
-        oninstall=()=>false;
-    }
-}
-
-destructuring_arguments_1: {
-    input: {
-        (function ( a ) { });
-        (function ( [ a ] ) { });
-        (function ( [ a, b ] ) { });
-        (function ( [ [ a ] ] ) { });
-        (function ( [ [ a, b ] ] ) { });
-        (function ( [ a, [ b ] ] ) { });
-        (function ( [ [ b ], a ] ) { });
-
-        (function ( { a } ) { });
-        (function ( { a, b } ) { });
-
-        (function ( [ { a } ] ) { });
-        (function ( [ { a, b } ] ) { });
-        (function ( [ a, { b } ] ) { });
-        (function ( [ { b }, a ] ) { });
-
-        ( [ a ] ) => { };
-        ( [ a, b ] ) => { };
-
-        ( { a } ) => { };
-        ( { a, b, c, d, e } ) => { };
-
-        ( [ a ] ) => b;
-        ( [ a, b ] ) => c;
-
-        ( { a } ) => b;
-        ( { a, b } ) => c;
-    }
-    expect: {
-        (function(a){});
-        (function([a]){});
-        (function([a,b]){});
-        (function([[a]]){});
-        (function([[a,b]]){});
-        (function([a,[b]]){});
-        (function([[b],a]){});
-
-        (function({a}){});
-        (function({a,b}){});
-
-        (function([{a}]){});
-        (function([{a,b}]){});
-        (function([a,{b}]){});
-        (function([{b},a]){});
-
-        ([a])=>{};
-        ([a,b])=>{};
-
-        ({a})=>{};
-        ({a,b,c,d,e})=>{};
-
-        ([a])=>b;
-        ([a,b])=>c;
-
-        ({a})=>b;
-        ({a,b})=>c;
-    }
-}
-
-destructuring_arguments_2: {
-    input: {
-        (function([]) {});
-        (function({}) {});
-        (function([,,,,,]) {});
-        (function ([a, {b: c}]) {});
-        (function ([...args]) {});
-        (function ({x,}) {});
-        class a { *method({ [thrower()]: x } = {}) {}};
-        (function(a, b, c, d, [{e: [...f]}]){})(1, 2, 3, 4, [{e: [1, 2, 3]}]);
-    }
-    expect: {
-        (function([]) {});
-        (function({}) {});
-        (function([,,,,,]) {});
-        (function ([a, {b: c}]) {});
-        (function ([...args]) {});
-        (function ({x,}) {});
-        class a { *method({ [thrower()]: x } = {}) {}};
-        (function(a, b, c, d, [{e: [...f]}]){})(1, 2, 3, 4, [{e: [1, 2, 3]}]);
-    }
-}
-
-destructuring_arguments_3: {
-    beautify = {
-        ecma: 6
-    }
-    input: {
-        function fn3({x: {y: {z: {} = 42}}}) {}
-        const { a = (function () {}), b = (0, function() {})  } = {};
-        let { c = (function () {}), d = (0, function() {})  } = {};
-        var { e = (function () {}), f = (0, function() {})  } = {};
-    }
-    expect_exact: "function fn3({x:{y:{z:{}=42}}}){}const{a=function(){},b=(0,function(){})}={};let{c=function(){},d=(0,function(){})}={};var{e=function(){},f=(0,function(){})}={};"
-}
-
-default_arguments: {
-    beautify = {
-        ecma: 6
-    }
-    input: {
-        function x(a = 6) { }
-        function x(a = (6 + 5)) { }
-        function x({ foo } = {}, [ bar ] = [ 1 ]) { }
-    }
-    expect_exact: "function x(a=6){}function x(a=6+5){}function x({foo}={},[bar]=[1]){}"
-}
-
-default_values_in_destructurings: {
-    beautify = {
-        ecma: 6
-    }
-    input: {
-        function x({a=(4), b}) {}
-        function x([b, c=(12)]) {}
-        var { x = (6), y } = x;
-        var [ x, y = (6) ] = x;
-    }
-    expect_exact: "function x({a=4,b}){}function x([b,c=12]){}var{x=6,y}=x;var[x,y=6]=x;"
-}
-
-accept_duplicated_parameters_in_non_strict_without_spread_or_default_assignment: {
-    input: {
-        function a(b, b){}
-        function b({c: test, c: test}){}
-    }
-    expect: {
-        function a(b, b){}
-        function b({c: test, c: test}){}
-    }
-}

test/compress/pure_funcs.js

@@ -293,3 +293,352 @@ unary: {
         bar();
     }
 }
+
+issue_2629_1: {
+    options = {
+        side_effects: true,
+    }
+    beautify = {
+        comments: "all",
+    }
+    input: {
+        /*@__PURE__*/ a();
+        /*@__PURE__*/ (b());
+        (/*@__PURE__*/ c)();
+        (/*@__PURE__*/ d());
+    }
+    expect_exact: [
+        "/* */c();",
+    ]
+}
+
+issue_2629_2: {
+    options = {
+        side_effects: true,
+    }
+    beautify = {
+        comments: "all",
+    }
+    input: {
+        /*@__PURE__*/ a(1)(2)(3);
+        /*@__PURE__*/ (b(1))(2)(3);
+        /*@__PURE__*/ (c(1)(2))(3);
+        /*@__PURE__*/ (d(1)(2)(3));
+        (/*@__PURE__*/ e)(1)(2)(3);
+        (/*@__PURE__*/ f(1))(2)(3);
+        (/*@__PURE__*/ g(1)(2))(3);
+        (/*@__PURE__*/ h(1)(2)(3));
+    }
+    expect_exact: [
+        "/* */e(1)(2)(3);",
+        "/* */f(1)(2)(3);",
+        "/* */g(1)(2)(3);",
+    ]
+}
+
+issue_2629_3: {
+    options = {
+        side_effects: true,
+    }
+    beautify = {
+        comments: "all",
+    }
+    input: {
+        /*@__PURE__*/ a.x(1).y(2).z(3);
+        /*@__PURE__*/ (b.x)(1).y(2).z(3);
+        /*@__PURE__*/ (c.x(1)).y(2).z(3);
+        /*@__PURE__*/ (d.x(1).y)(2).z(3);
+        /*@__PURE__*/ (e.x(1).y(2)).z(3);
+        /*@__PURE__*/ (f.x(1).y(2).z)(3);
+        /*@__PURE__*/ (g.x(1).y(2).z(3));
+        (/*@__PURE__*/ h).x(1).y(2).z(3);
+        (/*@__PURE__*/ i.x)(1).y(2).z(3);
+        (/*@__PURE__*/ j.x(1)).y(2).z(3);
+        (/*@__PURE__*/ k.x(1).y)(2).z(3);
+        (/*@__PURE__*/ l.x(1).y(2)).z(3);
+        (/*@__PURE__*/ m.x(1).y(2).z)(3);
+        (/*@__PURE__*/ n.x(1).y(2).z(3));
+    }
+    expect_exact: [
+        "/* */h.x(1).y(2).z(3);",
+        "/* */i.x(1).y(2).z(3);",
+        "/* */j.x(1).y(2).z(3);",
+        "/* */k.x(1).y(2).z(3);",
+        "/* */l.x(1).y(2).z(3);",
+        "/* */m.x(1).y(2).z(3);",
+    ]
+}
+
+issue_2629_4: {
+    options = {
+        side_effects: true,
+    }
+    input: {
+        (/*@__PURE__*/ x(), y());
+        (w(), /*@__PURE__*/ x(), y());
+    }
+    expect: {
+        y();
+        w(), y();
+    }
+}
+
+issue_2629_5: {
+    options = {
+        side_effects: true,
+    }
+    input: {
+        [ /*@__PURE__*/ x() ];
+        [ /*@__PURE__*/ x(), y() ];
+        [ w(), /*@__PURE__*/ x(), y() ];
+    }
+    expect: {
+        y();
+        w(), y();
+    }
+}
+
+issue_2638: {
+    options = {
+        side_effects: true,
+    }
+    beautify = {
+        comments: "all",
+    }
+    input: {
+        /*@__PURE__*/(g() || h())(x(), y());
+        (/*@__PURE__*/ (a() || b()))(c(), d());
+    }
+    expect_exact: [
+        "/* */x(),y();",
+        "/* */(a()||b())(c(),d());",
+    ]
+}
+
+issue_2705_1: {
+    options = {
+        side_effects: true,
+    }
+    beautify = {
+        comments: "all",
+    }
+    input: {
+        /*@__PURE__*/ new a();
+        /*@__PURE__*/ (new b());
+        new (/*@__PURE__*/ c)();
+        (/*@__PURE__*/ new d());
+    }
+    expect_exact: [
+        "new/* */c;",
+    ]
+}
+
+issue_2705_2: {
+    options = {
+        side_effects: true,
+    }
+    beautify = {
+        comments: "all",
+    }
+    input: {
+        /*@__PURE__*/ new a(1)(2)(3);
+        /*@__PURE__*/ new (b(1))(2)(3);
+        /*@__PURE__*/ new (c(1)(2))(3);
+        /*@__PURE__*/ new (d(1)(2)(3));
+        new (/*@__PURE__*/ e)(1)(2)(3);
+        (/*@__PURE__*/ new f(1))(2)(3);
+        (/*@__PURE__*/ new g(1)(2))(3);
+        (/*@__PURE__*/ new h(1)(2)(3));
+    }
+    expect_exact: [
+        "new/* */e(1)(2)(3);",
+        "/* */new f(1)(2)(3);",
+        "/* */new g(1)(2)(3);",
+    ]
+}
+
+issue_2705_3: {
+    options = {
+        side_effects: true,
+    }
+    beautify = {
+        comments: "all",
+    }
+    input: {
+        /*@__PURE__*/ new a.x(1).y(2).z(3);
+        /*@__PURE__*/ new (b.x)(1).y(2).z(3);
+        /*@__PURE__*/ new (c.x(1)).y(2).z(3);
+        /*@__PURE__*/ new (d.x(1).y)(2).z(3);
+        /*@__PURE__*/ new (e.x(1).y(2)).z(3);
+        /*@__PURE__*/ new (f.x(1).y(2).z)(3);
+        /*@__PURE__*/ new (g.x(1).y(2).z(3));
+        new (/*@__PURE__*/ h).x(1).y(2).z(3);
+        /* */ new (/*@__PURE__*/ i.x)(1).y(2).z(3);
+        (/*@__PURE__*/ new j.x(1)).y(2).z(3);
+        (/*@__PURE__*/ new k.x(1).y)(2).z(3);
+        (/*@__PURE__*/ new l.x(1).y(2)).z(3);
+        (/*@__PURE__*/ new m.x(1).y(2).z)(3);
+        (/*@__PURE__*/ new n.x(1).y(2).z(3));
+    }
+    expect_exact: [
+        "new/* */h.x(1).y(2).z(3);",
+        "/* */new/* */i.x(1).y(2).z(3);",
+        "/* */new j.x(1).y(2).z(3);",
+        "/* */new k.x(1).y(2).z(3);",
+        "/* */new l.x(1).y(2).z(3);",
+        "/* */new m.x(1).y(2).z(3);",
+    ]
+}
+
+issue_2705_4: {
+    options = {
+        side_effects: true,
+    }
+    input: {
+        (/*@__PURE__*/ new x(), y());
+        (w(), /*@__PURE__*/ new x(), y());
+    }
+    expect: {
+        y();
+        w(), y();
+    }
+}
+
+issue_2705_5: {
+    options = {
+        side_effects: true,
+    }
+    input: {
+        [ /*@__PURE__*/ new x() ];
+        [ /*@__PURE__*/ new x(), y() ];
+        [ w(), /*@__PURE__*/ new x(), y() ];
+    }
+    expect: {
+        y();
+        w(), y();
+    }
+}
+
+issue_2705_6: {
+    options = {
+        side_effects: true,
+    }
+    beautify = {
+        comments: "all",
+    }
+    input: {
+        /*@__PURE__*/new (g() || h())(x(), y());
+        /* */ new (/*@__PURE__*/ (a() || b()))(c(), d());
+    }
+    expect_exact: [
+        "/* */x(),y();",
+        "/* */new(/* */a()||b())(c(),d());",
+    ]
+}
+
+issue_3065_1: {
+    options = {
+        inline: true,
+        pure_funcs: [ "pureFunc" ],
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        function modifyWrapper(a, f, wrapper) {
+            wrapper.a = a;
+            wrapper.f = f;
+            return wrapper;
+        }
+        function pureFunc(fun) {
+            return modifyWrapper(1, fun, function(a) {
+                return fun(a);
+            });
+        }
+        var unused = pureFunc(function(x) {
+            return x;
+        });
+    }
+    expect: {}
+}
+
+issue_3065_2: {
+    rename = true
+    options = {
+        inline: true,
+        pure_funcs: [ "pureFunc" ],
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    mangle = {
+        reserved: [ "pureFunc" ],
+        toplevel: true,
+    }
+    input: {
+        function modifyWrapper(a, f, wrapper) {
+            wrapper.a = a;
+            wrapper.f = f;
+            return wrapper;
+        }
+        function pureFunc(fun) {
+            return modifyWrapper(1, fun, function(a) {
+                return fun(a);
+            });
+        }
+        var unused = pureFunc(function(x) {
+            return x;
+        });
+    }
+    expect: {}
+}
+
+issue_3065_3: {
+    options = {
+        pure_funcs: [ "debug" ],
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        function debug(msg) {
+            console.log(msg);
+        }
+        debug(function() {
+            console.log("PASS");
+            return "FAIL";
+        }());
+    }
+    expect: {
+        (function() {
+            console.log("PASS");
+        })();
+    }
+}
+
+issue_3065_4: {
+    options = {
+        pure_funcs: [ "debug" ],
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var debug = function(msg) {
+            console.log(msg);
+        };
+        debug(function() {
+            console.log("PASS");
+            return "FAIL";
+        }());
+    }
+    expect: {
+        (function() {
+            console.log("PASS");
+        })();
+    }
+}

test/compress/pure_getters.js

@@ -185,7 +185,7 @@ impure_getter_2: {
 
 issue_2110_1: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         pure_getters: "strict",
         sequences: true,
         side_effects: true,
@@ -274,7 +274,7 @@ set_immutable_1: {
 
 set_immutable_2: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         pure_getters: "strict",
         reduce_funcs: true,
@@ -324,7 +324,7 @@ set_immutable_3: {
 
 set_immutable_4: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         pure_getters: "strict",
         reduce_funcs: true,
@@ -348,6 +348,57 @@ set_immutable_4: {
     expect_stdout: true
 }
 
+set_immutable_5: {
+    options = {
+        collapse_vars: true,
+        conditionals: true,
+        evaluate: true,
+        pure_getters: "strict",
+        reduce_funcs: true,
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        "use strict";
+        var a = 1;
+        a.foo += "";
+        if (a.foo) console.log("FAIL");
+        else console.log("PASS");
+    }
+    expect: {
+        "use strict";
+        1..foo += "";
+        1..foo ? console.log("FAIL") : console.log("PASS");
+    }
+    expect_stdout: true
+}
+
+set_immutable_6: {
+    options = {
+        collapse_vars: true,
+        conditionals: true,
+        evaluate: true,
+        pure_getters: "strict",
+        reduce_funcs: true,
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = 1;
+        a.foo += "";
+        if (a.foo) console.log("FAIL");
+        else console.log("PASS");
+    }
+    expect: {
+        1..foo ? console.log("FAIL") : console.log("PASS");
+    }
+    expect_stdout: true
+}
+
 set_mutable_1: {
     options = {
         collapse_vars: true,
@@ -375,7 +426,7 @@ set_mutable_1: {
 
 set_mutable_2: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         pure_getters: "strict",
         reduce_funcs: true,
@@ -398,85 +449,9 @@ set_mutable_2: {
     expect_stdout: "PASS"
 }
 
-issue_2265_1: {
-    options = {
-        pure_getters: "strict",
-        side_effects: true,
-    }
-    input: {
-        ({ ...{} }).p;
-        ({ ...g }).p;
-    }
-    expect: {
-        ({ ...g }).p;
-    }
-}
-
-issue_2265_2: {
-    options = {
-        pure_getters: "strict",
-        reduce_funcs: true,
-        reduce_vars: true,
-        side_effects: true,
-        toplevel: true,
-    }
-    input: {
-        var a = {
-            get b() {
-                throw 0;
-            }
-        };
-        ({...a}).b;
-    }
-    expect: {
-        var a = {
-            get b() {
-                throw 0;
-            }
-        };
-        ({...a}).b;
-    }
-}
-
-issue_2265_3: {
-    options = {
-        pure_getters: "strict",
-        reduce_funcs: true,
-        reduce_vars: true,
-        side_effects: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var a = {
-            set b() {
-                throw 0;
-            }
-        };
-        ({...a}).b;
-    }
-    expect: {}
-}
-
-issue_2265_4: {
-    options = {
-        pure_getters: "strict",
-        reduce_funcs: true,
-        reduce_vars: true,
-        side_effects: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var a = { b: 1 };
-        ({...a}).b;
-    }
-    expect: {}
-}
-
 issue_2313_1: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         pure_getters: "strict",
         sequences: true,
@@ -522,7 +497,7 @@ issue_2313_1: {
 
 issue_2313_2: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         pure_getters: true,
         sequences: true,
@@ -688,50 +663,501 @@ issue_2313_6: {
     }
 }
 
-issue_2313_7: {
+issue_2678: {
+    options = {
+        pure_getters: "strict",
+        side_effects: true,
+    }
+    input: {
+        var a = 1, c = "FAIL";
+        (function f() {
+            (a-- && f()).p;
+            return {
+                get p() {
+                    c = "PASS";
+                }
+            };
+        })();
+        console.log(c);
+    }
+    expect: {
+        var a = 1, c = "FAIL";
+        (function f() {
+            (a-- && f()).p;
+            return {
+                get p() {
+                    c = "PASS";
+                }
+            };
+        })();
+        console.log(c);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_2838: {
+    options = {
+        pure_getters: true,
+        side_effects: true,
+    }
+    input: {
+        function f(a, b) {
+            (a || b).c = "PASS";
+            (function() {
+                return f(a, b);
+            }).prototype.foo = "bar";
+        }
+        var o = {};
+        f(null, o);
+        console.log(o.c);
+    }
+    expect: {
+        function f(a, b) {
+            (a || b).c = "PASS";
+        }
+        var o = {};
+        f(null, o);
+        console.log(o.c);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_2938_1: {
+    options = {
+        pure_getters: true,
+        unused: true,
+    }
+    input: {
+        function f(a) {
+            a.b = "PASS";
+        }
+        var o = {};
+        f(o);
+        console.log(o.b);
+    }
+    expect: {
+        function f(a) {
+            a.b = "PASS";
+        }
+        var o = {};
+        f(o);
+        console.log(o.b);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_2938_2: {
+    options = {
+        pure_getters: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var Parser = function Parser() {};
+        var p = Parser.prototype;
+        p.initialContext = function initialContext() {
+            console.log("PASS");
+        };
+        p.braceIsBlock = function() {};
+        (new Parser).initialContext();
+    }
+    expect: {
+        var Parser = function() {};
+        var p = Parser.prototype;
+        p.initialContext = function() {
+            console.log("PASS");
+        };
+        p.braceIsBlock = function() {};
+        (new Parser).initialContext();
+    }
+    expect_stdout: "PASS"
+}
+
+issue_2938_3: {
+    options = {
+        pure_getters: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        function f(a) {
+            var unused = a.a;
+            a.b = "PASS";
+            a.c;
+        }
+        var o = {};
+        o.d;
+        f(o);
+        console.log(o.b);
+    }
+    expect: {
+        function f(a) {
+            a.b = "PASS";
+        }
+        var o = {};
+        f(o);
+        console.log(o.b);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_2938_4: {
+    options = {
+        pure_getters: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var Parser = function Parser() {};
+        var p = Parser.prototype;
+        var unused = p.x;
+        p.initialContext = function initialContext() {
+            p.y;
+            console.log("PASS");
+        };
+        p.braceIsBlock = function() {};
+        (new Parser).initialContext();
+    }
+    expect: {
+        var Parser = function() {};
+        var p = Parser.prototype;
+        p.initialContext = function() {
+            console.log("PASS");
+        };
+        p.braceIsBlock = function() {};
+        (new Parser).initialContext();
+    }
+    expect_stdout: "PASS"
+}
+
+collapse_vars_1_true: {
+    options = {
+        collapse_vars: true,
+        pure_getters: true,
+        unused: true,
+    }
+    input: {
+        function f(a, b) {
+            for (;;) {
+                var c = a.g();
+                var d = b.p;
+                if (c || d) break;
+            }
+        }
+    }
+    expect: {
+        function f(a, b) {
+            for (;;) {
+                if (a.g() || b.p) break;
+            }
+        }
+    }
+}
+
+collapse_vars_1_false: {
+    options = {
+        collapse_vars: true,
+        pure_getters: false,
+        unused: true,
+    }
+    input: {
+        function f(a, b) {
+            for (;;) {
+                var c = a.g();
+                var d = b.p;
+                if (c || d) break;
+            }
+        }
+    }
+    expect: {
+        function f(a, b) {
+            for (;;) {
+                var c = a.g();
+                var d = b.p;
+                if (c || d) break;
+            }
+        }
+    }
+}
+
+collapse_vars_1_strict: {
+    options = {
+        collapse_vars: true,
+        pure_getters: "strict",
+        unused: true,
+    }
+    input: {
+        function f(a, b) {
+            for (;;) {
+                var c = a.g();
+                var d = b.p;
+                if (c || d) break;
+            }
+        }
+    }
+    expect: {
+        function f(a, b) {
+            for (;;) {
+                var c = a.g();
+                var d = b.p;
+                if (c || d) break;
+            }
+        }
+    }
+}
+
+collapse_vars_2_true: {
+    options = {
+        collapse_vars: true,
+        pure_getters: true,
+        reduce_vars: true,
+    }
+    input: {
+        function f() {
+            function g() {}
+            g.a = function() {};
+            g.b = g.a;
+            return g;
+        }
+    }
+    expect: {
+        function f() {
+            function g() {}
+            g.b = g.a = function() {};
+            return g;
+        }
+    }
+}
+
+collapse_vars_2_false: {
+    options = {
+        collapse_vars: true,
+        pure_getters: false,
+        reduce_vars: true,
+    }
+    input: {
+        function f() {
+            function g() {}
+            g.a = function() {};
+            g.b = g.a;
+            return g;
+        }
+    }
+    expect: {
+        function f() {
+            function g() {}
+            g.a = function() {};
+            g.b = g.a;
+            return g;
+        }
+    }
+}
+
+collapse_vars_2_strict: {
+    options = {
+        collapse_vars: true,
+        pure_getters: "strict",
+        reduce_vars: true,
+    }
+    input: {
+        function f() {
+            function g() {}
+            g.a = function() {};
+            g.b = g.a;
+            return g;
+        }
+    }
+    expect: {
+        function f() {
+            function g() {}
+            g.b = g.a = function() {};
+            return g;
+        }
+    }
+}
+
+collapse_rhs_true: {
     options = {
         collapse_vars: true,
-        conditionals: true,
         pure_getters: true,
     }
     input: {
-        var a = 0, b = 0;
-        class foo {
-            get c() {
-                a++;
-                return 42;
+        console.log((42..length = "PASS", "PASS"));
+        console.log(("foo".length = "PASS", "PASS"));
+        console.log((false.length = "PASS", "PASS"));
+        console.log((function() {}.length = "PASS", "PASS"));
+        console.log(({
+            get length() {
+                return "FAIL";
             }
-            set c(c) {
-                b++;
-            }
-        }
-        class bar extends foo {
-            d() {
-                super.c++;
-                if (super.c) console.log(a, b);
-            }
-        }
-        new bar().d();
+        }.length = "PASS", "PASS"));
     }
     expect: {
-        var a = 0, b = 0;
-        class foo {
-            get c() {
-                a++;
-                return 42;
+        console.log(42..length = "PASS");
+        console.log("foo".length = "PASS");
+        console.log(false.length = "PASS");
+        console.log(function() {}.length = "PASS");
+        console.log({
+            get length() {
+                return "FAIL";
             }
-            set c(c) {
-                b++;
-            }
-        }
-        class bar extends foo {
-            d() {
-                super.c++;
-                super.c && console.log(a, b);
-            }
-        }
-        new bar().d();
+        }.length = "PASS");
     }
-    expect_stdout: "2 1"
-    node_version: ">=6"
+    expect_stdout: [
+        "PASS",
+        "PASS",
+        "PASS",
+        "PASS",
+        "PASS",
+    ]
+}
+
+collapse_rhs_false: {
+    options = {
+        collapse_vars: true,
+        pure_getters: false,
+    }
+    input: {
+        console.log((42..length = "PASS", "PASS"));
+        console.log(("foo".length = "PASS", "PASS"));
+        console.log((false.length = "PASS", "PASS"));
+        console.log((function() {}.length = "PASS", "PASS"));
+        console.log(({
+            get length() {
+                return "FAIL";
+            }
+        }.length = "PASS", "PASS"));
+    }
+    expect: {
+        console.log(42..length = "PASS");
+        console.log("foo".length = "PASS");
+        console.log(false.length = "PASS");
+        console.log(function() {}.length = "PASS");
+        console.log({
+            get length() {
+                return "FAIL";
+            }
+        }.length = "PASS");
+    }
+    expect_stdout: [
+        "PASS",
+        "PASS",
+        "PASS",
+        "PASS",
+        "PASS",
+    ]
+}
+
+collapse_rhs_strict: {
+    options = {
+        collapse_vars: true,
+        pure_getters: "strict",
+    }
+    input: {
+        console.log((42..length = "PASS", "PASS"));
+        console.log(("foo".length = "PASS", "PASS"));
+        console.log((false.length = "PASS", "PASS"));
+        console.log((function() {}.length = "PASS", "PASS"));
+        console.log(({
+            get length() {
+                return "FAIL";
+            }
+        }.length = "PASS", "PASS"));
+    }
+    expect: {
+        console.log(42..length = "PASS");
+        console.log("foo".length = "PASS");
+        console.log(false.length = "PASS");
+        console.log(function() {}.length = "PASS");
+        console.log({
+            get length() {
+                return "FAIL";
+            }
+        }.length = "PASS");
+    }
+    expect_stdout: [
+        "PASS",
+        "PASS",
+        "PASS",
+        "PASS",
+        "PASS",
+    ]
+}
+
+collapse_rhs_setter: {
+    options = {
+        collapse_vars: true,
+        pure_getters: "strict",
+    }
+    input: {
+        try {
+            console.log(({
+                set length(v) {
+                    throw "PASS";
+                }
+            }.length = "FAIL", "FAIL"));
+        } catch (e) {
+            console.log(e);
+        }
+    }
+    expect: {
+        try {
+            console.log({
+                set length(v) {
+                    throw "PASS";
+                }
+            }.length = "FAIL");
+        } catch (e) {
+            console.log(e);
+        }
+    }
+    expect_stdout: "PASS"
+}
+
+collapse_rhs_call: {
+    options = {
+        collapse_vars: true,
+        passes: 2,
+        pure_getters: "strict",
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = {};
+        function f() {
+            console.log("PASS");
+        }
+        o.f = f;
+        f();
+    }
+    expect: {
+        ({}.f = function() {
+            console.log("PASS");
+        })();
+    }
+    expect_stdout: "PASS"
+}
+
+collapse_rhs_lhs: {
+    options = {
+        collapse_vars: true,
+        pure_getters: true,
+    }
+    input: {
+        function f(a, b) {
+            a.b = b, b += 2;
+            console.log(a.b, b);
+        }
+        f({}, 1);
+    }
+    expect: {
+        function f(a, b) {
+            a.b = b, b += 2;
+            console.log(a.b, b);
+        }
+        f({}, 1);
+    }
+    expect_stdout: "1 3"
 }

test/compress/regexp.js

@@ -0,0 +1,37 @@
+regexp_simple: {
+    input: {
+        /rx/ig
+    }
+    expect_exact: "/rx/gi;"
+}
+
+regexp_slashes: {
+    input: {
+        /\\\/rx\/\\/ig
+    }
+    expect_exact: "/\\\\\\/rx\\/\\\\/gi;"
+}
+
+regexp_1: {
+    input: {
+        console.log(JSON.stringify("COMPASS? Overpass.".match(/([Sap]+)/ig)));
+    }
+    expect: {
+        console.log(JSON.stringify("COMPASS? Overpass.".match(/([Sap]+)/gi)));
+    }
+    expect_stdout: '["PASS","pass"]'
+}
+
+regexp_2: {
+    options = {
+        evaluate: true,
+        unsafe: true,
+    }
+    input: {
+        console.log(JSON.stringify("COMPASS? Overpass.".match(new RegExp("([Sap]+)", "ig"))));
+    }
+    expect: {
+        console.log(JSON.stringify("COMPASS? Overpass.".match(/([Sap]+)/gi)));
+    }
+    expect_stdout: '["PASS","pass"]'
+}

test/compress/rename.js

@@ -109,7 +109,7 @@ mangle_catch_toplevel: {
         }
         console.log(a);
     }
-    expect_exact: 'var o="FAIL";try{throw 1}catch(c){o="PASS"}console.log(o);'
+    expect_exact: 'var c="FAIL";try{throw 1}catch(o){c="PASS"}console.log(c);'
     expect_stdout: "PASS"
 }
 
@@ -155,7 +155,7 @@ mangle_catch_var_toplevel: {
         }
         console.log(a);
     }
-    expect_exact: 'var o="FAIL";try{throw 1}catch(r){var o="PASS"}console.log(o);'
+    expect_exact: 'var r="FAIL";try{throw 1}catch(o){var r="PASS"}console.log(r);'
     expect_stdout: "PASS"
 }
 
@@ -451,7 +451,7 @@ function_iife_catch: {
         }
         f();
     }
-    expect_exact: "function f(o){!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"
 }
 
@@ -473,7 +473,7 @@ function_iife_catch_ie8: {
         }
         f();
     }
-    expect_exact: "function f(o){!function(){try{throw 0}catch(o){var c=1;console.log(o,c)}}()}f();"
+    expect_exact: "function f(c){!function(){try{throw 0}catch(c){var o=1;console.log(c,o)}}()}f();"
     expect_stdout: "0 1"
 }
 
@@ -499,7 +499,7 @@ function_catch_catch: {
         }
         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_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_stdout: [
         "3",
         "undefined",

test/compress/return_undefined.js

@@ -17,7 +17,6 @@ return_undefined: {
         keep_fnames   : false,
         hoist_vars    : true,
         join_vars     : true,
-        cascade       : true,
         negate_iife   : true
     };
     input: {

test/compress/sequences.js

@@ -288,7 +288,7 @@ unsafe_undefined: {
         if_return: true,
         sequences: true,
         side_effects: true,
-        unsafe: true,
+        unsafe_undefined: true,
     }
     input: {
         function f(undefined) {
@@ -317,7 +317,7 @@ unsafe_undefined: {
 
 issue_1685: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         side_effects: true,
     }
     input: {
@@ -341,7 +341,7 @@ issue_1685: {
 
 func_def_1: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         side_effects: true,
     }
     input: {
@@ -361,7 +361,7 @@ func_def_1: {
 
 func_def_2: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         side_effects: true,
     }
     input: {
@@ -379,7 +379,7 @@ func_def_2: {
 
 func_def_3: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         side_effects: true,
     }
     input: {
@@ -401,7 +401,7 @@ func_def_3: {
 
 func_def_4: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         side_effects: true,
     }
     input: {
@@ -427,7 +427,7 @@ func_def_4: {
 
 func_def_5: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         side_effects: true,
     }
     input: {
@@ -634,7 +634,7 @@ side_effects: {
 
 side_effects_cascade_1: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         sequences: true,
         side_effects: true,
@@ -655,7 +655,7 @@ side_effects_cascade_1: {
 
 side_effects_cascade_2: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         side_effects: true,
     }
     input: {
@@ -668,8 +668,7 @@ side_effects_cascade_2: {
     }
     expect: {
         function f(a, b) {
-            b = a,
-            !a + (b += a) || (b += a),
+            !(b = a) + (b += a) || (b += a),
             b = a;
         }
     }
@@ -677,7 +676,7 @@ side_effects_cascade_2: {
 
 side_effects_cascade_3: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         side_effects: true,
     }
@@ -692,14 +691,14 @@ side_effects_cascade_3: {
     expect: {
         function f(a, b) {
             !(b += a) && ((b = a) || (b -= a, b ^= a)),
-            --a;
+            a--;
         }
     }
 }
 
 issue_27: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         passes: 2,
         sequences: true,
         side_effects: true,
@@ -719,34 +718,10 @@ issue_27: {
     }
 }
 
-reassign_const: {
-    options = {
-        cascade: true,
-        sequences: true,
-        side_effects: true,
-    }
-    input: {
-        function f() {
-            const a = 1;
-            a++;
-            return a;
-        }
-        console.log(f());
-    }
-    expect: {
-        function f() {
-            const a = 1;
-            return a++, a;
-        }
-        console.log(f());
-    }
-    expect_stdout: true
-}
-
 issue_2062: {
     options = {
         booleans: true,
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         side_effects: true,
     }
@@ -765,7 +740,7 @@ issue_2062: {
 
 issue_2313: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         sequences: true,
         side_effects: true,
     }
@@ -803,3 +778,157 @@ issue_2313: {
     }
     expect_stdout: "2 1"
 }
+
+cascade_assignment_in_return: {
+    options = {
+        collapse_vars: true,
+        unused: true,
+    }
+    input: {
+        function f(a, b) {
+            return a = x(), b(a);
+        }
+    }
+    expect: {
+        function f(a, b) {
+            return b(x());
+        }
+    }
+}
+
+hoist_defun: {
+    options = {
+        join_vars: true,
+        sequences: true,
+    }
+    input: {
+        x();
+        function f() {}
+        y();
+    }
+    expect: {
+        function f() {}
+        x(), y();
+    }
+}
+
+hoist_decl: {
+    options = {
+        join_vars: true,
+        sequences: true,
+    }
+    input: {
+        var a;
+        w();
+        var b = x();
+        y();
+        for (var c; 0;) z();
+        var d;
+    }
+    expect: {
+        var a;
+        w();
+        var b = x(), c, d;
+        for (y(); 0;) z();
+    }
+}
+
+for_init_var: {
+    options = {
+        join_vars: true,
+        unused: false,
+    }
+    input: {
+        var a = "PASS";
+        (function() {
+            var b = 42;
+            for (var c = 5; c > 0;) c--;
+            a = "FAIL";
+            var a;
+        })();
+        console.log(a);
+    }
+    expect: {
+        var a = "PASS";
+        (function() {
+            for (var b = 42, c = 5, a; c > 0;) c--;
+            a = "FAIL";
+        })();
+        console.log(a);
+    }
+    expect_stdout: "PASS"
+}
+
+forin: {
+    options = {
+        sequences: true,
+    }
+    input: {
+        var o = [];
+        o.push("PASS");
+        for (var a in o)
+            console.log(o[a]);
+    }
+    expect: {
+        var o = [];
+        for (var a in o.push("PASS"), o)
+            console.log(o[a]);
+    }
+    expect_stdout: "PASS"
+}
+
+call: {
+    options = {
+        sequences: true,
+    }
+    input: {
+        var a = function() {
+            return this;
+        }();
+        function b() {
+            console.log("foo");
+        }
+        b.c = function() {
+            console.log(this === b ? "bar" : "baz");
+        };
+        (a, b)();
+        (a, b.c)();
+        (a, function() {
+            console.log(this === a);
+        })();
+        new (a, b)();
+        new (a, b.c)();
+        new (a, function() {
+            console.log(this === a);
+        })();
+    }
+    expect: {
+        var a = function() {
+            return this;
+        }();
+        function b() {
+            console.log("foo");
+        }
+        b.c = function() {
+            console.log(this === b ? "bar" : "baz");
+        },
+        a, b(),
+        (a, b.c)(),
+        a, function() {
+            console.log(this === a);
+        }(),
+        a, new b(),
+        a, new b.c(),
+        a, new function() {
+            console.log(this === a);
+        }();
+    }
+    expect_stdout: [
+        "foo",
+        "baz",
+        "true",
+        "foo",
+        "baz",
+        "false",
+    ]
+}

test/compress/string-literal.js

@@ -14,6 +14,13 @@ issue_1929: {
         function f(s) {
             return s.split(/[\\/]/);
         }
+        console.log(JSON.stringify(f("A/B\\C\\D/E\\F")));
     }
-    expect_exact: "function f(s){return s.split(/[\\\\/]/)}"
+    expect: {
+        function f(s) {
+            return s.split(/[\\/]/);
+        }
+        console.log(JSON.stringify(f("A/B\\C\\D/E\\F")));
+    }
+    expect_stdout: '["A","B","C","D","E","F"]'
 }

test/compress/super.js

@@ -1,9 +0,0 @@
-
-super_can_be_parsed: {
-    input: {
-        super(1,2);
-        super.meth();
-    }
-    expect_exact: "super(1,2);super.meth();"
-}
-

test/compress/template-string.js

@@ -1,508 +0,0 @@
-template_strings: {
-    beautify = {
-        quote_style: 3
-    }
-    input: {
-        ``;
-        `xx\`x`;
-        `${ foo + 2 }`;
-        ` foo ${ bar + `baz ${ qux }` }`;
-    }
-    expect_exact: "``;`xx\\`x`;`${foo+2}`;` foo ${bar+`baz ${qux}`}`;";
-}
-
-template_string_prefixes: {
-    beautify = {
-        quote_style: 3
-    }
-    input: {
-        String.raw`foo`;
-        foo `bar`;
-    }
-    expect_exact: "String.raw`foo`;foo`bar`;";
-}
-
-template_strings_ascii_only: {
-    beautify = {
-        ascii_only: true,
-        quote_style: 3
-    }
-    input: {
-        var foo = `foo
-        bar
-        ↂωↂ`;
-        var bar = `\``;
-    }
-    expect_exact: "var foo=`foo\\n        bar\\n        \\u2182\\u03c9\\u2182`;var bar=`\\``;"
-}
-
-template_strings_without_ascii_only: {
-    beautify = {
-        quote_style: 3
-    }
-    input: {
-        var foo = `foo
-        bar
-        ↂωↂ`
-    }
-    expect_exact: "var foo=`foo\\n        bar\\n        ↂωↂ`;"
-}
-
-template_string_with_constant_expression: {
-    options = {
-        evaluate: true
-    }
-    beautify = {
-        quote_style: 3
-    }
-    input: {
-        var foo = `${4 + 4} equals 4 + 4`;
-    }
-    expect: {
-        var foo = "8 equals 4 + 4";
-    }
-}
-
-template_string_with_predefined_constants: {
-    options = {
-        evaluate: true
-    }
-    beautify = {
-        quote_style: 3
-    }
-    input: {
-        var foo = `This is ${undefined}`;
-        var bar = `This is ${NaN}`;
-        var baz = `This is ${null}`;
-        var foofoo = `This is ${Infinity}`;
-        var foobar = "This is ${1/0}";
-        var foobaz = 'This is ${1/0}';
-        var barfoo = "This is ${NaN}";
-        var bazfoo = "This is ${null}";
-        var bazbaz = `This is ${1/0}`;
-        var barbar = `This is ${0/0}`;
-        var barbar = "This is ${0/0}";
-        var barber = 'This is ${0/0}';
-
-        var a = `${4**11}`; // 8 in template vs 7 chars - 4194304
-        var b = `${4**12}`; // 8 in template vs 8 chars - 16777216
-        var c = `${4**14}`; // 8 in template vs 9 chars - 268435456
-    }
-    expect: {
-        var foo = "This is undefined";
-        var bar = "This is NaN";
-        var baz = "This is null";
-        var foofoo = `This is ${1/0}`;
-        var foobar = "This is ${1/0}";
-        var foobaz = 'This is ${1/0}';
-        var barfoo = "This is ${NaN}";
-        var bazfoo = "This is ${null}";
-        var bazbaz = `This is ${1/0}`;
-        var barbar = "This is NaN";
-        var barbar = "This is ${0/0}";
-        var barber = 'This is ${0/0}';
-
-        var a = "4194304";
-        var b = "16777216"; // Potential for further concatentation
-        var c = `${4**14}`; // Not worth converting
-    }
-}
-
-template_string_evaluate_with_many_segments: {
-    options = {
-        evaluate: true
-    }
-    beautify = {
-        quote_style: 3
-    }
-    input: {
-        var foo = `Hello ${guest()}, welcome to ${location()}${"."}`;
-        var bar = `${1}${2}${3}${4}${5}${6}${7}${8}${9}${0}`;
-        var baz = `${foobar()}${foobar()}${foobar()}${foobar()}`;
-        var buzz = `${1}${foobar()}${2}${foobar()}${3}${foobar()}`;
-    }
-    expect: {
-        var foo = `Hello ${guest()}, welcome to ${location()}.`;
-        var bar = "1234567890";
-        var baz = `${foobar()}${foobar()}${foobar()}${foobar()}`;
-        var buzz = `1${foobar()}2${foobar()}3${foobar()}`;
-    }
-}
-
-template_string_with_many_segments: {
-    beautify = {
-        quote_style: 3
-    }
-    input: {
-        var foo = `Hello ${guest()}, welcome to ${location()}${"."}`;
-        var bar = `${1}${2}${3}${4}${5}${6}${7}${8}${9}${0}`;
-        var baz = `${foobar()}${foobar()}${foobar()}${foobar()}`;
-        var buzz = `${1}${foobar()}${2}${foobar()}${3}${foobar()}`;
-    }
-    expect: {
-        var foo = `Hello ${guest()}, welcome to ${location()}${"."}`;
-        var bar = `${1}${2}${3}${4}${5}${6}${7}${8}${9}${0}`;
-        var baz = `${foobar()}${foobar()}${foobar()}${foobar()}`;
-        var buzz = `${1}${foobar()}${2}${foobar()}${3}${foobar()}`;
-    }
-}
-
-template_string_to_normal_string: {
-    options = {
-        evaluate: true
-    }
-    beautify = {
-        quote_style: 0
-    }
-    input: {
-        var foo = `This is ${undefined}`;
-        var bar = "Decimals " + `${1}${2}${3}${4}${5}${6}${7}${8}${9}${0}`;
-    }
-    expect: {
-        var foo = "This is undefined";
-        var bar = "Decimals 1234567890";
-    }
-}
-
-template_concattenating_string: {
-    options = {
-        evaluate: true
-    }
-    beautify = {
-        quote_style: 3 // Yes, keep quotes
-    }
-    input: {
-        var foo = "Have a nice " + `day. ${`day. ` + `day.`}`;
-        var bar = "Have a nice " + `${day()}`;
-    }
-    expect: {
-        var foo = "Have a nice day. day. day.";
-        var bar = "Have a nice " + `${day()}`;
-    }
-}
-
-evaluate_nested_templates: {
-    options = {
-        evaluate: true
-    }
-    beautify = {
-        quote_style: 0
-    }
-    input: {
-        var baz = `${`${`${`foo`}`}`}`;
-    }
-    expect: {
-        var baz = "foo";
-    }
-}
-
-enforce_double_quotes: {
-    beautify = {
-        quote_style: 1
-    }
-    input: {
-        var foo = `Hello world`;
-        var bar = `Hello ${'world'}`;
-        var baz = `Hello ${world()}`;
-    }
-    expect: {
-        var foo = `Hello world`;
-        var bar = `Hello ${"world"}`;
-        var baz = `Hello ${world()}`;
-    }
-}
-
-enforce_single_quotes: {
-    beautify = {
-        quote_style: 2
-    }
-    input: {
-        var foo = `Hello world`;
-        var bar = `Hello ${"world"}`;
-        var baz = `Hello ${world()}`;
-    }
-    expect: {
-        var foo = `Hello world`;
-        var bar = `Hello ${'world'}`;
-        var baz = `Hello ${world()}`;
-    }
-}
-
-enforce_double_quotes_and_evaluate: {
-    beautify = {
-        quote_style: 1
-    }
-    options = {
-        evaluate: true
-    }
-    input: {
-        var foo = `Hello world`;
-        var bar = `Hello ${'world'}`;
-        var baz = `Hello ${world()}`;
-    }
-    expect: {
-        var foo = "Hello world";
-        var bar = "Hello world";
-        var baz = `Hello ${world()}`;
-    }
-}
-
-enforce_single_quotes_and_evaluate: {
-    beautify = {
-        quote_style: 2
-    }
-    options = {
-        evaluate: true
-    }
-    input: {
-        var foo = `Hello world`;
-        var bar = `Hello ${"world"}`;
-        var baz = `Hello ${world()}`;
-    }
-    expect: {
-        var foo = "Hello world";
-        var bar = "Hello world";
-        var baz = `Hello ${world()}`;
-    }
-}
-
-respect_inline_script: {
-    beautify = {
-        inline_script: true,
-        quote_style: 3
-    }
-    input: {
-        var foo = `</script>${content}`;
-        var bar = `<!--`;
-        var baz = `-->`;
-    }
-    expect_exact: "var foo=`<\\/script>${content}`;var bar=`\\x3c!--`;var baz=`--\\x3e`;";
-}
-
-do_not_optimize_tagged_template_1: {
-    beautify = {
-        quote_style: 0
-    }
-    options = {
-        evaluate: true
-    }
-    input: {
-        var foo = tag`Shall not be optimized. ${"But " + "this " + "is " + "fine."}`;
-        var bar = tag`Don't even mind changing my quotes!`;
-    }
-    expect_exact:
-        'var foo=tag`Shall not be optimized. ${"But this is fine."}`;var bar=tag`Don\'t even mind changing my quotes!`;';
-}
-
-do_not_optimize_tagged_template_2: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        var foo = tag`test` + " something out";
-    }
-    expect_exact: 'var foo=tag`test`+" something out";';
-}
-
-keep_raw_content_in_tagged_template: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        var foo = tag`\u0020\u{20}\u{00020}\x20\40\040 `;
-    }
-    expect_exact: "var foo=tag`\\u0020\\u{20}\\u{00020}\\x20\\40\\040 `;";
-}
-
-allow_chained_templates: {
-    input: {
-        var foo = tag`a``b``c``d`;
-    }
-    expect: {
-        var foo = tag`a``b``c``d`;
-    }
-}
-
-check_escaped_chars: {
-    input: {
-        var foo = `\u0020\u{20}\u{00020}\x20\40\040 `;
-    }
-    expect_exact: "var foo=`       `;";
-}
-
-escape_dollar_curly: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        console.log(`\$\{ beep \}`)
-        console.log(`${1-0}\${2-0}$\{3-0}${4-0}`)
-        console.log(`$${""}{not an expression}`)
-    }
-    expect_exact: 'console.log("${ beep }");console.log("1${2-0}${3-0}4");console.log("${not an expression}");'
-}
-
-template_starting_with_newline: {
-    options = {
-        dead_code: true
-    }
-    input: {
-        function foo(e) {
-            return `
-this is a template string!`;
-        };
-    }
-    expect_exact: "function foo(e){return`\\nthis is a template string!`}"
-}
-
-template_with_newline: {
-    options = {
-        dead_code: true
-    }
-    input: {
-        function foo(e) {
-            return `yep,
-this is a template string!`;
-        };
-    }
-    expect_exact: "function foo(e){return`yep,\\nthis is a template string!`}"
-}
-
-template_ending_with_newline: {
-    options = {
-        dead_code: true
-    }
-    input: {
-        function foo(e) {
-            return `this is a template string!
-`;
-        };
-    }
-    expect_exact: "function foo(e){return`this is a template string!\\n`}"
-}
-
-issue_1856: {
-    beautify = {
-        ascii_only: false,
-    }
-    input: {
-        console.log(`\\n\\r\\u2028\\u2029\n\r\u2028\u2029`);
-    }
-    expect_exact: "console.log(`\\\\n\\\\r\\\\u2028\\\\u2029\\n\\r\\u2028\\u2029`);"
-}
-
-issue_1856_ascii_only: {
-    beautify = {
-        ascii_only: true,
-    }
-    input: {
-        console.log(`\\n\\r\\u2028\\u2029\n\r\u2028\u2029`);
-    }
-    expect_exact: "console.log(`\\\\n\\\\r\\\\u2028\\\\u2029\\n\\r\\u2028\\u2029`);"
-}
-
-side_effects: {
-    options = {
-        evaluate: true,
-        side_effects: true,
-    }
-    input: {
-        `t1`;
-        tag`t2`;
-        `t${3}`;
-        tag`t${4}`;
-        console.log(`
-t${5}`);
-        function f(a) {
-            `t6${a}`;
-            a = `t7${a}` & a;
-            a = `t8${b}` | a;
-            a = f`t9${a}` ^ a;
-        }
-    }
-    expect: {
-        tag`t2`;
-        tag`t${4}`;
-        console.log("\nt5");
-        function f(a) {
-            a &= `t7${a}`;
-            a = `t8${b}` | a;
-            a = f`t9${a}` ^ a;
-        }
-    }
-}
-
-simple_string: {
-    options = {
-        computed_props: true,
-        evaluate: true,
-        properties: true,
-    }
-    input: {
-        console.log({[`foo`]: 1}[`foo`], `hi` == "hi", `world`);
-    }
-    expect: {
-        console.log([ 1 ][0], true, "world");
-    }
-    expect_stdout: "1 true 'world'"
-    node_version: ">=4"
-}
-
-semicolons: {
-    beautify = {
-        semicolons: false,
-    }
-    input: {
-        foo;
-        `bar`;
-    }
-    expect_exact: "foo;`bar`\n"
-}
-
-regex_1: {
-    input: {
-        console.log(`${/a/} ${6/2} ${/b/.test("b")} ${1?/c/:/d/}`);
-    }
-    expect_exact: 'console.log(`${/a/} ${6/2} ${/b/.test("b")} ${1?/c/:/d/}`);'
-    expect_stdout: "/a/ 3 true /c/"
-    node_version: ">=4"
-}
-
-regex_2: {
-    options = {
-        evaluate: true,
-        unsafe: true,
-    }
-    input: {
-        console.log(`${/a/} ${6/2} ${/b/.test("b")} ${1?/c/:/d/}`);
-    }
-    expect: {
-        console.log("/a/ 3 true /c/");
-    }
-    expect_stdout: "/a/ 3 true /c/"
-    node_version: ">=4"
-}
-
-sequence_1: {
-    input: {
-        console.log(`${1,2} ${/a/,/b/}`);
-    }
-    expect_exact: 'console.log(`${1,2} ${/a/,/b/}`);'
-    expect_stdout: "2 /b/"
-    node_version: ">=4"
-}
-
-sequence_2: {
-    options = {
-        evaluate: true,
-        side_effects: true,
-    }
-    input: {
-        console.log(`${1,2} ${/a/,/b/}`);
-    }
-    expect: {
-        console.log("2 /b/");
-    }
-    expect_stdout: "2 /b/"
-    node_version: ">=4"
-}