Merge pull request #2119 from alexlamsl/harmony-v3.0.18

Merging from master for 3.0.18

.travis.yml

@@ -1,12 +1,14 @@
 language: node_js
-before_install: "npm install -g npm"
 node_js:
     - "0.10"
     - "0.12"
     - "4"
     - "6"
+    - "8"
 env:
     - UGLIFYJS_TEST_ALL=1
 matrix:
   fast_finish: true
 sudo: false
+cache:
+  directories: tmp

README.md

@@ -1,6 +1,5 @@
 uglify-es
 =========
-[![Build Status](https://travis-ci.org/mishoo/UglifyJS2.svg)](https://travis-ci.org/mishoo/UglifyJS2)
 
 **uglify-es** is an ECMAScript 2015 parser, minifier, compressor and beautifier toolkit.
 
@@ -22,8 +21,7 @@ From NPM for programmatic use:
 
     npm install uglify-es
 
-Usage
+# Command line usage
------
 
     uglifyjs [input files] [options]
 
@@ -40,10 +38,11 @@ a double dash to prevent input files being used as option arguments:
 
     uglifyjs --compress --mangle -- input.js
 
-The available options are:
+### Command line options
 
 ```
     -h, --help                  Print usage information.
+                                `--help options` for details on available options.
     -V, --version               Print version number.
     -p, --parse <options>       Specify parser options:
                                 `acorn`  Use Acorn for parsing.
@@ -125,7 +124,7 @@ The available options are:
                                         the source map.
                                 `url`  If specified, path to the source map to append in
                                        `//# sourceMappingURL`.
-    --stats                     Display operations run time on STDERR.
+    --timings                   Display operations run time on STDERR.
     --toplevel                  Compress and/or mangle variables in top level scope.
     --verbose                   Print diagnostic messages.
     --warn                      Print warning messages.
@@ -139,7 +138,7 @@ The available options are:
 Specify `--output` (`-o`) to declare the output file.  Otherwise the output
 goes to STDOUT.
 
-## Source map options
+## CLI source map options
 
 UglifyJS can generate a source map file, which is highly useful for
 debugging your compressed JavaScript.  To get a source map, pass
@@ -183,7 +182,20 @@ To use this feature pass `--source-map content="/path/to/input/source.map"`
 or `--source-map content=inline` if the source map is included inline with
 the sources.
 
-## Mangler options
+## CLI compress options
+
+You need to pass `--compress` (`-c`) to enable the compressor.  Optionally
+you can pass a comma-separated list of [compress options](#compress-options).
+
+Options are in the form `foo=bar`, or just `foo` (the latter implies
+a boolean option that you want to set `true`; it's effectively a
+shortcut for `foo=true`).
+
+Example:
+
+    uglifyjs file.js -c toplevel,sequences=false
+
+## CLI mangle options
 
 To enable the mangler you need to pass `--mangle` (`-m`).  The following
 (comma-separated) options are supported:
@@ -202,26 +214,56 @@ comma-separated list of names.  For example:
 
 to prevent the `require`, `exports` and `$` names from being changed.
 
-### Mangling property names (`--mangle-props`)
+### CLI mangling property names (`--mangle-props`)
 
-**Note:** this will probably break your code.  Mangling property names is a
+**Note:** THIS WILL PROBABLY BREAK YOUR CODE.  Mangling property names
-separate step, different from variable name mangling.  Pass
+is a separate step, different from variable name mangling.  Pass
-`--mangle-props`.  It will mangle all properties that are seen in some
+`--mangle-props` to enable it.  It will mangle all properties in the
-object literal, or that are assigned to.  For example:
+input code with the exception of built in DOM properties and properties
+in core javascript classes.  For example:
 
-```js
+```javascript
+// example.js
 var x = {
-  foo: 1
+    baz_: 0,
+    foo_: 1,
+    calc: function() {
+        return this.foo_ + this.baz_;
+    }
 };
-
+x.bar_ = 2;
-x.bar = 2;
+x["baz_"] = 3;
-x["baz"] = 3;
+console.log(x.calc());
-x[condition ? "moo" : "boo"] = 4;
+```
-console.log(x.something());
+Mangle all properties (except for javascript `builtins`):
+```bash
+$ uglifyjs example.js -c -m --mangle-props
+```
+```javascript
+var x={o:0,_:1,l:function(){return this._+this.o}};x.t=2,x.o=3,console.log(x.l());
+```
+Mangle all properties except for `reserved` properties:
+```bash
+$ uglifyjs example.js -c -m --mangle-props reserved=[foo_,bar_]
+```
+```javascript
+var x={o:0,foo_:1,_:function(){return this.foo_+this.o}};x.bar_=2,x.o=3,console.log(x._());
+```
+Mangle all properties matching a `regex`:
+```bash
+$ uglifyjs example.js -c -m --mangle-props regex=/_$/
+```
+```javascript
+var x={o:0,_:1,calc:function(){return this._+this.o}};x.l=2,x.o=3,console.log(x.calc());
 ```
 
-In the above code, `foo`, `bar`, `baz`, `moo` and `boo` will be replaced
+Combining mangle properties options:
-with single characters, while `something()` will be left as is.
+```bash
+$ uglifyjs example.js -c -m --mangle-props regex=/_$/,reserved=[bar_]
+```
+```javascript
+var x={o:0,_:1,calc:function(){return this._+this.o}};x.bar_=2,x.o=3,console.log(x.calc());
+```
 
 In order for this to be of any use, we avoid mangling standard JS names by
 default (`--mangle-props builtins` to override).
@@ -230,7 +272,7 @@ A default exclusion file is provided in `tools/domprops.json` which should
 cover most standard JS and DOM properties defined in various browsers.  Pass
 `--mangle-props domprops` to disable this feature.
 
-You can also use a regular expression to define which property names should be
+A regular expression can be used to define which property names should be
 mangled.  For example, `--mangle-props regex=/^_/` will only mangle property
 names that start with an underscore.
 
@@ -240,10 +282,10 @@ mangled to the same name in all of them.  For this, pass `--name-cache filename.
 and UglifyJS will maintain these mappings in a file which can then be reused.
 It should be initially empty.  Example:
 
-```
+```bash
-rm -f /tmp/cache.json  # start fresh
+$ rm -f /tmp/cache.json  # start fresh
-uglifyjs file1.js file2.js --mangle-props --name-cache /tmp/cache.json -o part1.js
+$ uglifyjs file1.js file2.js --mangle-props --name-cache /tmp/cache.json -o part1.js
-uglifyjs file3.js file4.js --mangle-props --name-cache /tmp/cache.json -o part2.js
+$ uglifyjs file3.js file4.js --mangle-props --name-cache /tmp/cache.json -o part2.js
 ```
 
 Now, `part1.js` and `part2.js` will be consistent with each other in terms
@@ -252,18 +294,29 @@ of mangled property names.
 Using the name cache is not necessary if you compress all your files in a
 single call to UglifyJS.
 
-#### Mangling unquoted names (`--mangle-props keep_quoted`)
+### Mangling unquoted names (`--mangle-props keep_quoted`)
 
 Using quoted property name (`o["foo"]`) reserves the property name (`foo`)
 so that it is not mangled throughout the entire script even when used in an
 unquoted style (`o.foo`). Example:
 
+```javascript
+// stuff.js
+var o = {
+    "foo": 1,
+    bar: 3
+};
+o.foo += o.bar;
+console.log(o.foo);
 ```
-$ echo 'var o={"foo":1, bar:3}; o.foo += o.bar; console.log(o.foo);' | uglifyjs --mangle-props keep_quoted -mc
+```bash
-var o={foo:1,a:3};o.foo+=o.a,console.log(o.foo);
+$ uglifyjs stuff.js --mangle-props keep_quoted -c -m
+```
+```javascript
+var o={foo:1,o:3};o.foo+=o.o,console.log(o.foo);
 ```
 
-#### Debugging property name mangling
+### Debugging property name mangling
 
 You can also pass `--mangle-props debug` in order to mangle property names
 without completely obscuring them. For example the property `o.foo`
@@ -271,6 +324,13 @@ would mangle to `o._$foo$_` with this option. This allows property mangling
 of a large codebase while still being able to debug the code and identify
 where mangling is breaking things.
 
+```bash
+$ uglifyjs stuff.js --mangle-props debug -c -m
+```
+```javascript
+var o={_$foo$_:1,_$bar$_:3};o._$foo$_+=o._$bar$_,console.log(o._$foo$_);
+```
+
 You can also pass a custom suffix using `--mangle-props debug=XYZ`. This would then
 mangle `o.foo` to `o._$foo$XYZ_`. You can change this each time you compile a
 script to identify how a property got mangled. One technique is to pass a
@@ -278,12 +338,211 @@ random number on every compile to simulate mangling changing with different
 inputs (e.g. as you update the input script with new properties), and to help
 identify mistakes like writing mangled keys to storage.
 
-## Compressor options
 
-You need to pass `--compress` (`-c`) to enable the compressor.  Optionally
+# API Reference
-you can pass a comma-separated list of options.  Options are in the form
+
-`foo=bar`, or just `foo` (the latter implies a boolean option that you want
+Assuming installation via NPM, you can load UglifyJS in your application
-to set `true`; it's effectively a shortcut for `foo=true`).
+like this:
+```javascript
+var UglifyJS = require("uglify-es");
+```
+
+There is a single high level function, **`minify(code, options)`**,
+which will perform all minification [phases](#minify-options) in a configurable
+manner. By default `minify()` will enable the options [`compress`](#compress-options)
+and [`mangle`](#mangle-options). Example:
+```javascript
+var code = "function add(first, second) { return first + second; }";
+var result = UglifyJS.minify(code);
+console.log(result.error); // runtime error, or `undefined` if no error
+console.log(result.code);  // minified output: function add(n,d){return n+d}
+```
+
+You can `minify` more than one JavaScript file at a time by using an object
+for the first argument where the keys are file names and the values are source
+code:
+```javascript
+var code = {
+    "file1.js": "function add(first, second) { return first + second; }",
+    "file2.js": "console.log(add(1 + 2, 3 + 4));"
+};
+var result = UglifyJS.minify(code);
+console.log(result.code);
+// function add(d,n){return d+n}console.log(add(3,7));
+```
+
+The `toplevel` option:
+```javascript
+var code = {
+    "file1.js": "function add(first, second) { return first + second; }",
+    "file2.js": "console.log(add(1 + 2, 3 + 4));"
+};
+var options = { toplevel: true };
+var result = UglifyJS.minify(code, options);
+console.log(result.code);
+// console.log(function(n,o){return n+o}(3,7));
+```
+
+An example of a combination of `minify()` options:
+```javascript
+var code = {
+    "file1.js": "function add(first, second) { return first + second; }",
+    "file2.js": "console.log(add(1 + 2, 3 + 4));"
+};
+var options = {
+    toplevel: true,
+    compress: {
+        global_defs: {
+            "@console.log": "alert"
+        },
+        passes: 2
+    },
+    output: {
+        beautify: false,
+        preamble: "/* uglified */"
+    }
+};
+var result = UglifyJS.minify(code, options);
+console.log(result.code);
+// /* uglified */
+// alert(10);"
+```
+
+To produce warnings:
+```javascript
+var code = "function f(){ var u; return 2 + 3; }";
+var options = { warnings: true };
+var result = UglifyJS.minify(code, options);
+console.log(result.error);    // runtime error, `undefined` in this case
+console.log(result.warnings); // [ 'Dropping unused variable u [0:1,18]' ]
+console.log(result.code);     // function f(){return 5}
+```
+
+An error example:
+```javascript
+var result = UglifyJS.minify({"foo.js" : "if (0) else console.log(1);"});
+console.log(JSON.stringify(result.error));
+// {"message":"Unexpected token: keyword (else)","filename":"foo.js","line":1,"col":7,"pos":7}
+```
+Note: unlike `uglify-js@2.x`, the `3.x` API does not throw errors. To
+achieve a similar effect one could do the following:
+```javascript
+var result = UglifyJS.minify(code, options);
+if (result.error) throw result.error;
+```
+
+## Minify options
+
+- `warnings` (default `false`) — pass `true` to return compressor warnings
+  in `result.warnings`. Use the value `"verbose"` for more detailed warnings.
+
+- `parse` (default `{}`) — pass an object if you wish to specify some
+  additional [parse options](#parse-options).
+
+- `compress` (default `{}`) — pass `false` to skip compressing entirely.
+  Pass an object to specify custom [compress options](#compress-options).
+
+- `mangle` (default `true`) — pass `false` to skip mangling names, or pass
+  an object to specify [mangle options](#mangle-options) (see below).
+
+  - `mangle.properties` (default `false`) — a subcategory of the mangle option.
+    Pass an object to specify custom [mangle property options](#mangle-properties-options).
+
+- `output` (default `null`) — pass an object if you wish to specify
+  additional [output options](#output-options).  The defaults are optimized
+  for best compression.
+
+- `sourceMap` (default `false`) - pass an object if you wish to specify
+  [source map options](#source-map-options).
+
+- `toplevel` (default `false`) - set to `true` if you wish to enable top level
+  variable and function name mangling and to drop unused variables and functions.
+
+- `ie8` (default `false`) - set to `true` to support IE8.
+
+## Minify options structure
+
+```javascript
+{
+    warnings: false,
+    parse: {
+        // parse options
+    },
+    compress: {
+        // compress options
+    },
+    mangle: {
+        // mangle options
+
+        properties: {
+            // mangle property options
+        }
+    },
+    output: {
+        // output options
+    },
+    sourceMap: {
+        // source map options
+    },
+    toplevel: false,
+    ie8: false,
+}
+```
+
+### Source map options
+
+To generate a source map:
+```javascript
+var result = UglifyJS.minify({"file1.js": "var a = function() {};"}, {
+    sourceMap: {
+        filename: "out.js",
+        url: "out.js.map"
+    }
+});
+console.log(result.code); // minified output
+console.log(result.map);  // source map
+```
+
+Note that the source map is not saved in a file, it's just returned in
+`result.map`.  The value passed for `sourceMap.url` is only used to set
+`//# sourceMappingURL=out.js.map` in `result.code`. The value of
+`filename` is only used to set `file` attribute (see [the spec][sm-spec])
+in source map file.
+
+You can set option `sourceMap.url` to be `"inline"` and source map will
+be appended to code.
+
+You can also specify sourceRoot property to be included in source map:
+```javascript
+var result = UglifyJS.minify({"file1.js": "var a = function() {};"}, {
+    sourceMap: {
+        root: "http://example.com/src",
+        url: "out.js.map"
+    }
+});
+```
+
+If you're compressing compiled JavaScript and have a source map for it, you
+can use `sourceMap.content`:
+```javascript
+var result = UglifyJS.minify({"compiled.js": "compiled code"}, {
+    sourceMap: {
+        content: "content from compiled.js.map",
+        url: "minified.js.map"
+    }
+});
+// same as before, it returns `code` and `map`
+```
+
+If you're using the `X-SourceMap` header instead, you can just omit `sourceMap.url`.
+
+## Parse options
+
+- `bare_returns` (default `false`) -- support top level `return` statements
+- `html5_comments` (default `true`)
+- `shebang` (default `true`) -- support `#!command` as the first line
+
+## Compress options
 
 - `sequences` (default: true) -- join consecutive simple statements using the
   comma operator.  May be set to a positive integer to specify the maximum number
@@ -310,12 +569,18 @@ to set `true`; it's effectively a shortcut for `foo=true`).
   comparison are switching. Compression only works if both `comparisons` and
   `unsafe_comps` are both set to true.
 
+- `unsafe_Func` (default: false) -- compress and mangle `Function(args, code)`
+  when both `args` and `code` are string literals.
+
 - `unsafe_math` (default: false) -- optimize numerical expressions like
   `2 * x * 3` into `6 * x`, which may give imprecise floating point results.
 
 - `unsafe_proto` (default: false) -- optimize expressions like
   `Array.prototype.slice.call(a)` into `[].slice.call(a)`
 
+- `unsafe_regexp` (default: false) -- enable substitutions of variables with
+  `RegExp` values the same way as if they are constants.
+
 - `conditionals` -- apply optimizations for `if`-s and conditional
   expressions
 
@@ -348,13 +613,15 @@ to set `true`; it's effectively a shortcut for `foo=true`).
 
 - `if_return` -- optimizations for if/return and if/continue
 
+- `inline` -- embed simple functions
+
 - `join_vars` -- join consecutive `var` statements
 
 - `cascade` -- small optimization for sequences, transform `x, x` into `x`
   and `x = something(), x` into `x = something()`
 
-- `collapse_vars` -- Collapse single-use `var` and `const` definitions
+- `collapse_vars` -- Collapse single-use non-constant variables - side
-  when possible.
+  effects permitting.
 
 - `reduce_vars` -- Improve optimization on variables assigned with and
   used as constant values.
@@ -406,13 +673,152 @@ to set `true`; it's effectively a shortcut for `foo=true`).
 - `keep_infinity` -- default `false`. Pass `true` to prevent `Infinity` from
   being compressed into `1/0`, which may cause performance issues on Chrome.
 
-- `side_effects` -- default `false`. Pass `true` to potentially drop functions
+- `side_effects` -- default `true`. Pass `false` to disable potentially dropping
-marked as "pure".  A function call is marked as "pure" if a comment annotation
+  functions marked as "pure".  A function call is marked as "pure" if a comment
-`/*@__PURE__*/` or `/*#__PURE__*/` immediately precedes the call. For example:
+  annotation `/*@__PURE__*/` or `/*#__PURE__*/` immediately precedes the call. For
-`/*@__PURE__*/foo()`;
+  example: `/*@__PURE__*/foo();`
 
+## Mangle options
 
-### The `unsafe` option
+- `reserved` (default `[]`). Pass an array of identifiers that should be
+  excluded from mangling. Example: `["foo", "bar"]`.
+
+- `toplevel` (default `false`). Pass `true` to mangle names declared in the
+  top level scope.
+
+- `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).
+
+- `eval` (default `false`). Pass `true` to mangle names visible in scopes
+  where `eval` or `with` are used.
+
+- `safari10` (default `false`). Pass `true` to work around the Safari 10 loop
+  iterator [bug](https://bugs.webkit.org/show_bug.cgi?id=171041)
+  "Cannot declare a let variable twice".
+
+Examples:
+
+```javascript
+// test.js
+var globalVar;
+function funcName(firstLongName, anotherLongName) {
+    var myVariable = firstLongName +  anotherLongName;
+}
+```
+```javascript
+var code = fs.readFileSync("test.js", "utf8");
+
+UglifyJS.minify(code).code;
+// 'function funcName(a,n){}var globalVar;'
+
+UglifyJS.minify(code, { mangle: { reserved: ['firstLongName'] } }).code;
+// 'function funcName(firstLongName,a){}var globalVar;'
+
+UglifyJS.minify(code, { mangle: { toplevel: true } }).code;
+// 'function n(n,a){}var a;'
+```
+
+### Mangle properties options
+
+- `reserved` (default: `[]`) -- Do not mangle property names listed in the
+  `reserved` array.
+- `regex` (default: `null`) -— Pass a RegExp literal to only mangle property
+  names matching the regular expression.
+- `keep_quoted` (default: `false`) -— Only mangle unquoted property names.
+- `debug` (default: `false`) -— Mangle names with the original name still present.
+  Pass an empty string `""` to enable, or a non-empty string to set the debug suffix.
+- `builtins` (default: `false`) -- Use `true` to allow the mangling of builtin
+  DOM properties. Not recommended to override this setting.
+
+## Output options
+
+The code generator tries to output shortest code possible by default.  In
+case you want beautified output, pass `--beautify` (`-b`).  Optionally you
+can pass additional arguments that control the code output:
+
+- `ascii_only` (default `false`) -- escape Unicode characters in strings and
+  regexps (affects directives with non-ascii characters becoming invalid)
+- `beautify` (default `true`) -- whether to actually beautify the output.
+  Passing `-b` will set this to true, but you might need to pass `-b` even
+  when you want to generate minified code, in order to specify additional
+  arguments, so you can use `-b beautify=false` to override it.
+- `bracketize` (default `false`) -- always insert brackets in `if`, `for`,
+  `do`, `while` or `with` statements, even if their body is a single
+  statement.
+- `comments` (default `false`) -- pass `true` or `"all"` to preserve all
+  comments, `"some"` to preserve some comments, a regular expression string
+  (e.g. `/^!/`) or a function.
+- `ecma` (default `5`) -- set output printing mode.  This will only change the
+  output in direct control of the beautifier.  Non-compatible features in the
+  abstract syntax tree will still be outputted as is.
+- `indent_level` (default 4)
+- `indent_start` (default 0) -- prefix all lines by that many spaces
+- `inline_script` (default `false`) -- escape the slash in occurrences of
+  `</script` in strings
+- `keep_quoted_props` (default `false`) -- when turned on, prevents stripping
+  quotes from property names in object literals.
+- `max_line_len` (default `false`) -- maximum line length (for uglified code)
+- `preamble` (default `null`) -- when passed it must be a string and
+  it will be prepended to the output literally.  The source map will
+  adjust for this text.  Can be used to insert a comment containing
+  licensing information, for example.
+- `preserve_line` (default `false`) -- pass `true` to preserve lines, but it
+  only works if `beautify` is set to `false`.
+- `quote_keys` (default `false`) -- pass `true` to quote all keys in literal
+  objects
+- `quote_style` (default `0`) -- preferred quote style for strings (affects
+  quoted property names and directives as well):
+  - `0` -- prefers double quotes, switches to single quotes when there are
+    more double quotes in the string itself. `0` is best for gzip size.
+  - `1` -- always use single quotes
+  - `2` -- always use double quotes
+  - `3` -- always use the original quotes
+- `semicolons` (default `true`) -- separate statements with semicolons.  If
+  you pass `false` then whenever possible we will use a newline instead of a
+  semicolon, leading to more readable output of uglified code (size before
+  gzip could be smaller; size after gzip insignificantly larger).
+- `shebang` (default `true`) -- preserve shebang `#!` in preamble (bash scripts)
+- `width` (default 80) -- only takes effect when beautification is on, this
+  specifies an (orientative) line width that the beautifier will try to
+  obey.  It refers to the width of the line text (excluding indentation).
+  It doesn't work very well currently, but it does make the code generated
+  by UglifyJS more readable.
+- `wrap_iife` (default `false`) -- pass `true` to wrap immediately invoked
+  function expressions. See
+  [#640](https://github.com/mishoo/UglifyJS2/issues/640) for more details.
+
+# Miscellaneous
+
+### Keeping copyright notices or other comments
+
+You can pass `--comments` to retain certain comments in the output.  By
+default it will keep JSDoc-style comments that contain "@preserve",
+"@license" or "@cc_on" (conditional compilation for IE).  You can pass
+`--comments all` to keep all the comments, or a valid JavaScript regexp to
+keep only comments that match this regexp.  For example `--comments /^!/`
+will keep comments like `/*! Copyright Notice */`.
+
+Note, however, that there might be situations where comments are lost.  For
+example:
+```javascript
+function f() {
+    /** @preserve Foo Bar */
+    function g() {
+        // this function is never called
+    }
+    return something();
+}
+```
+
+Even though it has "@preserve", the comment will be lost because the inner
+function `g` (which is the AST node to which the comment is attached to) is
+discarded by the compressor as not referenced.
+
+The safest comments where to place copyright information (or other info that
+needs to be kept in the output) are comments attached to toplevel nodes.
+
+### The `unsafe` `compress` option
 
 It enables some transformations that *might* break code logic in certain
 contrived cases, but should be fine for most code.  You might want to try it
@@ -450,8 +856,8 @@ Another way of doing that is to declare your globals as constants in a
 separate file and include it into the build.  For example you can have a
 `build/defines.js` file with the following:
 ```javascript
-const DEBUG = false;
+var DEBUG = false;
-const PRODUCTION = true;
+var PRODUCTION = true;
 // etc.
 ```
 
@@ -465,12 +871,13 @@ code as usual.  The build will contain the `const` declarations if you use
 them. If you are targeting < ES6 environments which does not support `const`,
 using `var` with `reduce_vars` (enabled by default) should suffice.
 
-#### Conditional compilation, API
+### Conditional compilation API
+
 You can also use conditional compilation via the programmatic API. With the difference that the
 property name is `global_defs` and is a compressor property:
 
-```js
+```javascript
-uglifyJS.minify(fs.readFileSync("input.js", "utf8"), {
+var result = UglifyJS.minify(fs.readFileSync("input.js", "utf8"), {
     compress: {
         dead_code: true,
         global_defs: {
@@ -480,84 +887,72 @@ uglifyJS.minify(fs.readFileSync("input.js", "utf8"), {
 });
 ```
 
-## Beautifier options
+To replace an identifier with an arbitrary non-constant expression it is
-
+necessary to prefix the `global_defs` key with `"@"` to instruct UglifyJS
-The code generator tries to output shortest code possible by default.  In
+to parse the value as an expression:
-case you want beautified output, pass `--beautify` (`-b`).  Optionally you
-can pass additional arguments that control the code output:
-
-- `beautify` (default `true`) -- whether to actually beautify the output.
-  Passing `-b` will set this to true, but you might need to pass `-b` even
-  when you want to generate minified code, in order to specify additional
-  arguments, so you can use `-b beautify=false` to override it.
-- `indent_level` (default 4)
-- `indent_start` (default 0) -- prefix all lines by that many spaces
-- `quote_keys` (default `false`) -- pass `true` to quote all keys in literal
-  objects
-- `space_colon` (default `true`) -- insert a space after the colon signs
-- `ascii_only` (default `false`) -- escape Unicode characters in strings and
-  regexps (affects directives with non-ascii characters becoming invalid)
-- `inline_script` (default `false`) -- escape the slash in occurrences of
-  `</script` in strings
-- `width` (default 80) -- only takes effect when beautification is on, this
-  specifies an (orientative) line width that the beautifier will try to
-  obey.  It refers to the width of the line text (excluding indentation).
-  It doesn't work very well currently, but it does make the code generated
-  by UglifyJS more readable.
-- `max_line_len` (default 32000) -- maximum line length (for uglified code)
-- `bracketize` (default `false`) -- always insert brackets in `if`, `for`,
-  `do`, `while` or `with` statements, even if their body is a single
-  statement.
-- `semicolons` (default `true`) -- separate statements with semicolons.  If
-  you pass `false` then whenever possible we will use a newline instead of a
-  semicolon, leading to more readable output of uglified code (size before
-  gzip could be smaller; size after gzip insignificantly larger).
-- `preamble` (default `null`) -- when passed it must be a string and
-  it will be prepended to the output literally.  The source map will
-  adjust for this text.  Can be used to insert a comment containing
-  licensing information, for example.
-- `quote_style` (default `0`) -- preferred quote style for strings (affects
-  quoted property names and directives as well):
-  - `0` -- prefers double quotes, switches to single quotes when there are
-    more double quotes in the string itself.
-  - `1` -- always use single quotes
-  - `2` -- always use double quotes
-  - `3` -- always use the original quotes
-- `keep_quoted_props` (default `false`) -- when turned on, prevents stripping
-  quotes from property names in object literals.
-- `ecma` (default `5`) -- set output printing mode.  This will only change the
-  output in direct control of the beautifier.  Non-compatible features in the
-  abstract syntax tree will still be outputted as is.
-
-### Keeping copyright notices or other comments
-
-You can pass `--comments` to retain certain comments in the output.  By
-default it will keep JSDoc-style comments that contain "@preserve",
-"@license" or "@cc_on" (conditional compilation for IE).  You can pass
-`--comments all` to keep all the comments, or a valid JavaScript regexp to
-keep only comments that match this regexp.  For example `--comments /^!/`
-will keep comments like `/*! Copyright Notice */`.
-
-Note, however, that there might be situations where comments are lost.  For
-example:
 ```javascript
-function f() {
+UglifyJS.minify("alert('hello');", {
-	/** @preserve Foo Bar */
+    compress: {
-	function g() {
+        global_defs: {
-	  // this function is never called
+            "@alert": "console.log"
         }
-	return something();
     }
+}).code;
+// returns: 'console.log("hello");'
 ```
 
-Even though it has "@preserve", the comment will be lost because the inner
+Otherwise it would be replaced as string literal:
-function `g` (which is the AST node to which the comment is attached to) is
+```javascript
-discarded by the compressor as not referenced.
+UglifyJS.minify("alert('hello');", {
+    compress: {
+        global_defs: {
+            "alert": "console.log"
+        }
+    }
+}).code;
+// returns: '"console.log"("hello");'
+```
 
-The safest comments where to place copyright information (or other info that
+### Using native Uglify AST with `minify()`
-needs to be kept in the output) are comments attached to toplevel nodes.
+```javascript
+// example: parse only, produce native Uglify AST
 
-## Support for the SpiderMonkey AST
+var result = UglifyJS.minify(code, {
+    parse: {},
+    compress: false,
+    mangle: false,
+    output: {
+        ast: true,
+        code: false  // optional - faster if false
+    }
+});
+
+// result.ast contains native Uglify AST
+```
+```javascript
+// example: accept native Uglify AST input and then compress and mangle
+//          to produce both code and native AST.
+
+var result = UglifyJS.minify(ast, {
+    compress: {},
+    mangle: {},
+    output: {
+        ast: true,
+        code: true  // optional - faster if false
+    }
+});
+
+// result.ast contains native Uglify AST
+// result.code contains the minified code in string form.
+```
+
+### 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.
+
+### ESTree / SpiderMonkey AST
 
 UglifyJS has its own abstract syntax tree format; for
 [practical reasons](http://lisperator.net/blog/uglifyjs-why-not-switching-to-spidermonkey-ast/)
@@ -585,141 +980,5 @@ Acorn is really fast (e.g. 250ms instead of 380ms on some 650K code), but
 converting the SpiderMonkey tree that Acorn produces takes another 150ms so
 in total it's a bit more than just using UglifyJS's own parser.
 
-API Reference
--------------
-
-Assuming installation via NPM, you can load UglifyJS in your application
-like this:
-```javascript
-var UglifyJS = require("uglify-es");
-```
-
-There is a single toplevel function, `minify(files, options)`, which will
-performs all the steps in a configurable manner.
-Example:
-```javascript
-var result = UglifyJS.minify("var b = function() {};");
-console.log(result.code);  // minified output
-console.log(result.error); // runtime error
-```
-
-You can also compress multiple files:
-```javascript
-var result = UglifyJS.minify({
-  "file1.js": "var a = function() {};",
-  "file2.js": "var b = function() {};"
-});
-console.log(result.code);
-```
-
-To generate a source map:
-```javascript
-var result = UglifyJS.minify({"file1.js": "var a = function() {};"}, {
-  sourceMap: {
-    filename: "out.js",
-    url: "out.js.map"
-  }
-});
-console.log(result.code); // minified output
-console.log(result.map);  // source map
-```
-
-Note that the source map is not saved in a file, it's just returned in
-`result.map`.  The value passed for `sourceMap.url` is only used to set
-`//# sourceMappingURL=out.js.map` in `result.code`. The value of
-`filename` is only used to set `file` attribute (see [the spec][sm-spec])
-in source map file.
-
-You can set option `sourceMap.url` to be `"inline"` and source map will
-be appended to code.
-
-You can also specify sourceRoot property to be included in source map:
-```javascript
-var result = UglifyJS.minify({"file1.js": "var a = function() {};"}, {
-  sourceMap: {
-    root: "http://example.com/src",
-    url: "out.js.map"
-  }
-});
-```
-
-If you're compressing compiled JavaScript and have a source map for it, you
-can use `sourceMap.content`:
-```javascript
-var result = UglifyJS.minify({"compiled.js": "compiled code"}, {
-  sourceMap: {
-    content: "content from compiled.js.map",
-    url: "minified.js.map"
-  }
-});
-// same as before, it returns `code` and `map`
-```
-
-If you're using the `X-SourceMap` header instead, you can just omit `sourceMap.url`.
-
-Other options:
-
-- `warnings` (default `false`) — pass `true` to display compressor warnings.
-
-- `mangle` (default `true`) — pass `false` to skip mangling names, or pass
-  an object to specify mangling options (see below).
-
-- `mangleProperties` (default `false`) — pass an object to specify custom
-  mangle property options.
-
-- `output` (default `null`) — pass an object if you wish to specify
-  additional [output options](#beautifier-options).  The defaults are optimized
-  for best compression.
-
-- `compress` (default `{}`) — pass `false` to skip compressing entirely.
-  Pass an object to specify custom [compressor options](#compressor-options).
-
-- `parse` (default {}) — pass an object if you wish to specify some
-  additional [parser options](#the-parser).
-
-##### mangle
-
-- `reserved` - pass an array of identifiers that should be excluded from mangling
-
-- `toplevel` — mangle names declared in the toplevel scope (disabled by
-default).
-
-- `eval` — mangle names visible in scopes where eval or with are used
-(disabled by default).
-
-- `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](#compressor-options).
-
-Examples:
-
-```javascript
-// test.js
-var globalVar;
-function funcName(firstLongName, anotherLongName)
-{
-    var myVariable = firstLongName +  anotherLongName;
-}
-```
-```javascript
-var code = fs.readFileSync("test.js", "utf8");
-
-UglifyJS.minify(code).code;
-// 'function funcName(a,n){}var globalVar;'
-
-UglifyJS.minify(code, { mangle: { reserved: ['firstLongName'] } }).code;
-// 'function funcName(firstLongName,a){}var globalVar;'
-
-UglifyJS.minify(code, { mangle: { toplevel: true } }).code;
-// 'function n(n,a){}var a;'
-```
-
-##### mangle.properties options
-
-- `regex` — Pass a RegExp to only mangle certain names
-- `keep_quoted` — Only mangle unquoted property names
-- `debug` — Mangle names with the original name still present. Defaults to `false`.
-  Pass an empty string to enable, or a non-empty string to set the suffix.
-
 [acorn]: https://github.com/ternjs/acorn
 [sm-spec]: https://docs.google.com/document/d/1U1RGAehQwRypUTovF1KRlpiOFze0b-_2gc6fAH0KY0k

bin/uglifyjs

@@ -21,10 +21,20 @@ var options = {
     compress: false,
     mangle: false
 };
-program._name = info.name;
+program.version(info.name + " " + info.version);
-program.version(info.version);
 program.parseArgv = program.parse;
 program.parse = undefined;
+if (process.argv.indexOf("ast") >= 0) program.helpInformation = UglifyJS.describe_ast;
+else if (process.argv.indexOf("options") >= 0) program.helpInformation = function() {
+    var text = [];
+    var options = UglifyJS.default_options();
+    for (var option in options) {
+        text.push("--" + (option == "output" ? "beautify" : option == "sourceMap" ? "source-map" : option) + " options:");
+        text.push(format_object(options[option]));
+        text.push("");
+    }
+    return text.join("\n");
+};
 program.option("-p, --parse <options>", "Specify parser options.", parse_js("parse", true));
 program.option("-c, --compress [options]", "Enable compressor/specify compressor options.", parse_js("compress", true));
 program.option("-m, --mangle [options]", "Mangle names/specify mangler options.", parse_js("mangle", true));
@@ -39,7 +49,7 @@ program.option("--keep-fnames", "Do not mangle/drop function names. Useful for c
 program.option("--name-cache <file>", "File to hold mangled name mappings.");
 program.option("--self", "Build UglifyJS as a library (implies --wrap UglifyJS)");
 program.option("--source-map [options]", "Enable source map/specify source map options.", parse_source_map());
-program.option("--stats", "Display operations run time on STDERR.")
+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.");
@@ -115,10 +125,10 @@ if (program.output == "ast") {
     };
 }
 if (program.parse) {
-    if (program.parse.acorn || program.parse.spidermonkey) {
+    if (!program.parse.acorn && !program.parse.spidermonkey) {
-        if (program.sourceMap) fatal("ERROR: inline source map only works with built-in parser");
-    } else {
         options.parse = program.parse;
+    } else if (program.sourceMap && program.sourceMap.content == "inline") {
+        fatal("ERROR: inline source map only works with built-in parser");
     }
 }
 var convert_path = function(name) {
@@ -140,7 +150,7 @@ if (program.verbose) {
 }
 if (program.self) {
     if (program.args.length) {
-        console.error("WARN: Ignoring input files since --self was passed");
+        print_error("WARN: Ignoring input files since --self was passed");
     }
     if (!options.wrap) options.wrap = "UglifyJS";
     simple_glob(UglifyJS.FILES).forEach(function(name) {
@@ -170,9 +180,9 @@ function convert_ast(fn) {
 
 function run() {
     UglifyJS.AST_Node.warn_function = function(msg) {
-        console.error("WARN:", msg);
+        print_error("WARN: " + msg);
     };
-    if (program.stats) program.stats = Date.now();
+    if (program.timings) options.timings = true;
     try {
         if (program.parse) {
             if (program.parse.acorn) {
@@ -199,7 +209,7 @@ function run() {
     if (result.error) {
         var ex = result.error;
         if (ex.name == "SyntaxError") {
-            console.error("Parse error at " + ex.filename + ":" + ex.line + "," + ex.col);
+            print_error("Parse error at " + ex.filename + ":" + ex.line + "," + ex.col);
             var col = ex.col;
             var lines = files[ex.filename].split(/\r?\n/);
             var line = lines[ex.line - 1];
@@ -208,21 +218,22 @@ function run() {
                 col = line.length;
             }
             if (line) {
-                if (col > 40) {
+                var limit = 70;
-                    line = line.slice(col - 40);
+                if (col > limit) {
-                    col = 40;
+                    line = line.slice(col - limit);
+                    col = limit;
                 }
-                console.error(line.slice(0, 80));
+                print_error(line.slice(0, 80));
-                console.error(line.slice(0, col).replace(/\S/g, " ") + "^");
+                print_error(line.slice(0, col).replace(/\S/g, " ") + "^");
             }
         }
         if (ex.defs) {
-            console.error("Supported options:");
+            print_error("Supported options:");
-            console.error(ex.defs);
+            print_error(format_object(ex.defs));
         }
         fatal(ex);
     } else if (program.output == "ast") {
-        console.log(JSON.stringify(result.ast, function(key, value) {
+        print(JSON.stringify(result.ast, function(key, value) {
             if (skip_key(key)) return;
             if (value instanceof UglifyJS.AST_Token) return;
             if (value instanceof UglifyJS.Dictionary) return;
@@ -238,7 +249,7 @@ function run() {
             return value;
         }, 2));
     } else if (program.output == "spidermonkey") {
-        console.log(JSON.stringify(UglifyJS.minify(result.code, {
+        print(JSON.stringify(UglifyJS.minify(result.code, {
             compress: false,
             mangle: false,
             output: {
@@ -252,19 +263,21 @@ function run() {
             fs.writeFileSync(program.output + ".map", result.map);
         }
     } else {
-        console.log(result.code);
+        print(result.code);
     }
     if (program.nameCache) {
         fs.writeFileSync(program.nameCache, JSON.stringify(cache, function(key, value) {
             return value instanceof UglifyJS.Dictionary ? value.toObject() : value;
         }));
     }
-    if (program.stats) console.error("Elapsed:", Date.now() - program.stats);
+    if (result.timings) for (var phase in result.timings) {
+        print_error("- " + phase + ": " + result.timings[phase].toFixed(3) + "s");
+    }
 }
 
 function fatal(message) {
     if (message instanceof Error) message = message.stack.replace(/^\S*?Error:/, "ERROR:")
-    console.error(message);
+    print_error(message);
     process.exit(1);
 }
 
@@ -349,7 +362,7 @@ function parse_js(flag, constants) {
                 }
             }));
         } catch(ex) {
-            fatal("Error parsing arguments for '" + flag + "': " + value);
+            options[value] = null;
         }
         return options;
     }
@@ -358,10 +371,10 @@ function parse_js(flag, constants) {
 function parse_source_map() {
     var parse = parse_js("sourceMap", true);
     return function(value, options) {
-        var hasContent = options && options.sourceMap && "content" in options.sourceMap;
+        var hasContent = options && "content" in options;
         var settings = parse(value, options);
         if (!hasContent && settings.content && settings.content != "inline") {
-            console.error("INFO: Using input source map:", settings.content);
+            print_error("INFO: Using input source map: " + settings.content);
             settings.content = read_file(settings.content, settings.content);
         }
         return settings;
@@ -383,3 +396,25 @@ function to_cache(key) {
 function skip_key(key) {
     return skip_keys.indexOf(key) >= 0;
 }
+
+function format_object(obj) {
+    var lines = [];
+    var padding = "";
+    Object.keys(obj).map(function(name) {
+        if (padding.length < name.length) padding = Array(name.length + 1).join(" ");
+        return [ name, JSON.stringify(obj[name]) ];
+    }).forEach(function(tokens) {
+        lines.push("  " + tokens[0] + padding.slice(tokens[0].length - 2) + tokens[1]);
+    });
+    return lines.join("\n");
+}
+
+function print_error(msg) {
+    process.stderr.write(msg);
+    process.stderr.write("\n");
+}
+
+function print(txt) {
+    process.stdout.write(txt);
+    process.stdout.write("\n");
+}

lib/ast.js

@@ -355,86 +355,14 @@ var AST_Expansion = DEFNODE("Expansion", "expression", {
     }
 });
 
-var AST_ArrowParametersOrSeq = DEFNODE("ArrowParametersOrSeq", "expressions", {
+var AST_Lambda = DEFNODE("Lambda", "name argnames uses_arguments is_generator async", {
-    $documentation: "A set of arrow function parameters or a sequence expression. This is used because when the parser sees a \"(\" it could be the start of a seq, or the start of a parameter list of an arrow function.",
-    $propdoc: {
-        expressions: "[AST_Expression|AST_Destructuring|AST_Expansion*] array of expressions or argument names or destructurings."
-    },
-    as_params: function (croak) {
-        // We don't want anything which doesn't belong in a destructuring
-        var root = this;
-        return this.expressions.map(function to_fun_args(ex, _, __, default_seen_above) {
-            var insert_default = function(ex, default_value) {
-                if (default_value) {
-                    return new AST_DefaultAssign({
-                        start: ex.start,
-                        left: ex,
-                        operator: "=",
-                        right: default_value,
-                        end: default_value.end
-                    });
-                }
-                return ex;
-            }
-            if (ex instanceof AST_Object) {
-                return insert_default(new AST_Destructuring({
-                    start: ex.start,
-                    end: ex.end,
-                    is_array: false,
-                    names: ex.properties.map(to_fun_args)
-                }), default_seen_above);
-            } else if (ex instanceof AST_ObjectKeyVal) {
-                if (ex.key instanceof AST_SymbolRef) {
-                    ex.key = to_fun_args(ex.key, 0, [ex.key]);
-                }
-                ex.value = to_fun_args(ex.value, 0, [ex.key]);
-                return insert_default(ex, default_seen_above);
-            } else if (ex instanceof AST_Hole) {
-                return ex;
-            } else if (ex instanceof AST_Destructuring) {
-                ex.names = ex.names.map(to_fun_args);
-                return insert_default(ex, default_seen_above);
-            } else if (ex instanceof AST_SymbolRef) {
-                return insert_default(new AST_SymbolFunarg({
-                    name: ex.name,
-                    start: ex.start,
-                    end: ex.end
-                }), default_seen_above);
-            } else if (ex instanceof AST_Expansion) {
-                ex.expression = to_fun_args(ex.expression);
-                return insert_default(ex, default_seen_above);
-            } else if (ex instanceof AST_Array) {
-                return insert_default(new AST_Destructuring({
-                    start: ex.start,
-                    end: ex.end,
-                    is_array: true,
-                    names: ex.elements.map(to_fun_args)
-                }), default_seen_above);
-            } else if (ex instanceof AST_Assign) {
-                return insert_default(to_fun_args(ex.left, undefined, undefined, ex.right), default_seen_above);
-            } else if (ex instanceof AST_DefaultAssign) {
-                ex.left = to_fun_args(ex.left, 0, [ex.left]);
-                return ex;
-            } else {
-                croak("Invalid function parameter", ex.start.line, ex.start.col);
-            }
-        });
-    },
-    as_expr: function() {
-        var exprs = this.expressions;
-        return exprs.length == 1 ? exprs[0] : new AST_Sequence({
-            expressions: exprs
-        });
-    }
-});
-
-var AST_Lambda = DEFNODE("Lambda", "name argnames uses_arguments is_generator", {
     $documentation: "Base class for functions",
     $propdoc: {
-        is_generator: "[boolean] is generatorFn or not",
         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"
+        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 = [];
@@ -966,11 +894,12 @@ var AST_ObjectGetter = DEFNODE("ObjectGetter", "quote static", {
     $documentation: "An object getter property",
 }, AST_ObjectProperty);
 
-var AST_ConciseMethod = DEFNODE("ConciseMethod", "quote static is_generator", {
+var AST_ConciseMethod = DEFNODE("ConciseMethod", "quote static is_generator async", {
     $propdoc: {
         quote: "[string|undefined] the original quote character, if any",
-        static: "[boolean] whether this method is static (classes only)",
+        static: "[boolean] is this method static (classes only)",
-        is_generator: "[boolean] is generatorFn or not",
+        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);
@@ -1174,7 +1103,17 @@ var AST_True = DEFNODE("True", null, {
     value: true
 }, AST_Boolean);
 
-/* -----[ Yield ]----- */
+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",

lib/minify.js

@@ -30,9 +30,6 @@ function set_shorthand(name, options, keys) {
 function minify(files, options) {
     var warn_function = AST_Node.warn_function;
     try {
-        if (typeof files == "string") {
-            files = [ files ];
-        }
         options = defaults(options, {
             compress: {},
             ie8: false,
@@ -41,10 +38,14 @@ function minify(files, options) {
             output: {},
             parse: {},
             sourceMap: false,
+            timings: false,
             toplevel: false,
             warnings: false,
             wrap: false,
         }, true);
+        var timings = options.timings && {
+            start: Date.now()
+        };
         set_shorthand("ie8", options, [ "compress", "mangle", "output" ]);
         set_shorthand("keep_fnames", options, [ "compress", "mangle" ]);
         set_shorthand("toplevel", options, [ "compress", "mangle" ]);
@@ -77,13 +78,17 @@ function minify(files, options) {
                 warnings.push(warning);
             };
         }
+        if (timings) timings.parse = Date.now();
         var toplevel;
         if (files instanceof AST_Toplevel) {
             toplevel = files;
         } else {
+            if (typeof files == "string") {
+                files = [ files ];
+            }
             options.parse = options.parse || {};
             options.parse.toplevel = null;
-            for (var name in files) {
+            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") {
@@ -97,19 +102,23 @@ function minify(files, options) {
         if (options.wrap) {
             toplevel = toplevel.wrap_commonjs(options.wrap);
         }
-        if (options.compress) {
+        if (timings) timings.scope1 = Date.now();
-            toplevel.figure_out_scope(options.mangle);
+        if (options.compress) toplevel.figure_out_scope(options.mangle);
-            toplevel = new Compressor(options.compress).compress(toplevel);
+        if (timings) timings.compress = Date.now();
-        }
+        if (options.compress) toplevel = new Compressor(options.compress).compress(toplevel);
+        if (timings) timings.scope2 = Date.now();
+        if (options.mangle) toplevel.figure_out_scope(options.mangle);
+        if (timings) timings.mangle = Date.now();
         if (options.mangle) {
-            toplevel.figure_out_scope(options.mangle);
             base54.reset();
             toplevel.compute_char_frequency(options.mangle);
             toplevel.mangle_names(options.mangle);
-            if (options.mangle.properties) {
+        }
+        if (timings) timings.properties = Date.now();
+        if (options.mangle && options.mangle.properties) {
             toplevel = mangle_properties(toplevel, options.mangle.properties);
         }
-        }
+        if (timings) timings.output = Date.now();
         var result = {};
         if (options.output.ast) {
             result.ast = toplevel;
@@ -125,7 +134,9 @@ function minify(files, options) {
                     root: options.sourceMap.root
                 });
                 if (options.sourceMap.includeSources) {
-                    for (var name in files) {
+                    if (files instanceof AST_Toplevel) {
+                        throw new Error("original source content unavailable");
+                    } else for (var name in files) if (HOP(files, name)) {
                         options.output.source_map.get().setSourceContent(name, files[name]);
                     }
                 }
@@ -144,6 +155,18 @@ function minify(files, options) {
                 }
             }
         }
+        if (timings) {
+            timings.end = Date.now();
+            result.timings = {
+                parse: 1e-3 * (timings.scope1 - timings.parse),
+                scope: 1e-3 * (timings.compress - timings.scope1 + timings.mangle - timings.scope2),
+                compress: 1e-3 * (timings.scope2 - timings.compress),
+                mangle: 1e-3 * (timings.properties - timings.mangle),
+                properties: 1e-3 * (timings.output - timings.properties),
+                output: 1e-3 * (timings.end - timings.output),
+                total: 1e-3 * (timings.end - timings.start)
+            }
+        }
         if (warnings.length) {
             result.warnings = warnings;
         }

lib/output.js

@@ -73,8 +73,7 @@ function OutputStream(options) {
         shebang          : true,
         shorthand        : undefined,
         source_map       : null,
-        space_colon      : true,
+        webkit           : false,
-        unescape_regexps : false,
         width            : 80,
         wrap_iife        : false,
     }, true);
@@ -214,12 +213,43 @@ function OutputStream(options) {
     var might_need_semicolon = false;
     var might_add_newline = 0;
     var last = "";
+    var mapping_token, mapping_name, mappings = options.source_map && [];
+
+    var do_add_mapping = mappings ? function() {
+        mappings.forEach(function(mapping) {
+            try {
+                options.source_map.add(
+                    mapping.token.file,
+                    mapping.line, mapping.col,
+                    mapping.token.line, mapping.token.col,
+                    !mapping.name && mapping.token.type == "name" ? mapping.token.value : mapping.name
+                );
+            } catch(ex) {
+                AST_Node.warn("Couldn't figure out mapping for {file}:{line},{col} → {cline},{ccol} [{name}]", {
+                    file: mapping.token.file,
+                    line: mapping.token.line,
+                    col: mapping.token.col,
+                    cline: mapping.line,
+                    ccol: mapping.col,
+                    name: mapping.name || ""
+                })
+            }
+        });
+        mappings = [];
+    } : noop;
 
     var ensure_line_len = options.max_line_len ? function() {
         if (current_col > options.max_line_len) {
             if (might_add_newline) {
                 var left = OUTPUT.slice(0, might_add_newline);
                 var right = OUTPUT.slice(might_add_newline);
+                if (mappings) {
+                    var delta = right.length - current_col;
+                    mappings.forEach(function(mapping) {
+                        mapping.line++;
+                        mapping.col += delta;
+                    });
+                }
                 OUTPUT = left + "\n" + right;
                 current_line++;
                 current_pos++;
@@ -229,7 +259,10 @@ function OutputStream(options) {
                 AST_Node.warn("Output exceeds {max_line_len} characters", options);
             }
         }
+        if (might_add_newline) {
             might_add_newline = 0;
+            do_add_mapping();
+        }
     } : noop;
 
     var requireSemicolonChars = makePredicate("( [ + * / - , .");
@@ -289,6 +322,18 @@ function OutputStream(options) {
             }
             might_need_space = false;
         }
+
+        if (mapping_token) {
+            mappings.push({
+                token: mapping_token,
+                name: mapping_name,
+                line: current_line,
+                col: current_col
+            });
+            mapping_token = false;
+            if (!might_add_newline) do_add_mapping();
+        }
+
         OUTPUT += str;
         current_pos += str.length;
         var a = str.split(/\r?\n/), n = a.length - 1;
@@ -384,27 +429,12 @@ function OutputStream(options) {
 
     function colon() {
         print(":");
-        if (options.space_colon) space();
+        space();
     };
 
-    var add_mapping = options.source_map ? function(token, name) {
+    var add_mapping = mappings ? function(token, name) {
-        try {
+        mapping_token = token;
-            if (token) options.source_map.add(
+        mapping_name = name;
-                token.file || "?",
-                current_line, current_col,
-                token.line, token.col,
-                (!name && token.type == "name") ? token.value : name
-            );
-        } catch(ex) {
-            AST_Node.warn("Couldn't figure out mapping for {file}:{line},{col} → {cline},{ccol} [{name}]", {
-                file: token.file,
-                line: token.line,
-                col: token.col,
-                cline: current_line,
-                ccol: current_col,
-                name: name || ""
-            })
-        }
     } : noop;
 
     function get() {
@@ -600,6 +630,13 @@ function OutputStream(options) {
             return true;
         }
 
+        if (output.option('webkit')) {
+            var p = output.parent();
+            if (p instanceof AST_PropAccess && p.expression === this) {
+                return true;
+            }
+        }
+
         if (output.option('wrap_iife')) {
             var p = output.parent();
             return p instanceof AST_Call && p.expression === this;
@@ -613,6 +650,10 @@ function OutputStream(options) {
         return p instanceof AST_PropAccess && p.expression === this;
     });
 
+    PARENS(AST_ClassExpression, function(output){
+        return output.parent() instanceof AST_SimpleStatement;
+    });
+
     // same goes for an object literal, because otherwise it would be
     // interpreted as a block of code.
     PARENS(AST_Object, function(output){
@@ -644,7 +685,6 @@ function OutputStream(options) {
                                                                * ==> 20 (side effect, set a := 10 and b := 20) */
             || p instanceof AST_Arrow                         // x => (x, x)
             || p instanceof AST_DefaultAssign                 // x => (x = (0, function(){}))
-            || (p instanceof AST_Class && p.extends === this) // class D extends (calls++, C) {}
         ;
     });
 
@@ -777,17 +817,15 @@ function OutputStream(options) {
 
     DEFPRINT(AST_Destructuring, function (self, output) {
         output.print(self.is_array ? "[" : "{");
-        var first = true;
         var len = self.names.length;
         self.names.forEach(function (name, i) {
-            if (first) first = false; else { output.comma(); output.space(); }
+            if (i > 0) output.comma();
             name.print(output);
             // If the final element is a hole, we need to make sure it
             // doesn't look like a trailing comma, by inserting an actual
             // trailing comma.
-            if (i === len - 1 && name instanceof AST_Hole)
+            if (i == len - 1 && name instanceof AST_Hole) output.comma();
-              output.comma();
+        });
-        })
         output.print(self.is_array ? "]" : "}");
     });
 
@@ -940,6 +978,10 @@ function OutputStream(options) {
     AST_Lambda.DEFMETHOD("_do_print", function(output, nokeyword){
         var self = this;
         if (!nokeyword) {
+            if (this.async) {
+                output.print("async");
+                output.space();
+            }
             output.print("function");
             if (this.is_generator) {
                 output.star();
@@ -1045,6 +1087,22 @@ function OutputStream(options) {
         }
     });
 
+    DEFPRINT(AST_Await, function(self, output){
+        output.print("await");
+        output.space();
+        var e = self.expression;
+        var parens = !(
+               e instanceof AST_Call
+            || e instanceof AST_SymbolRef
+            || e instanceof AST_PropAccess
+            || e instanceof AST_Unary
+            || e instanceof AST_Constant
+        );
+        if (parens) output.print("(");
+        self.expression.print(output);
+        if (parens) output.print(")");
+    });
+
     /* -----[ loop control ]----- */
     AST_LoopControl.DEFMETHOD("_do_print", function(output, kind){
         output.print(kind);
@@ -1474,11 +1532,25 @@ function OutputStream(options) {
             output.space();
         }
         if (self.extends) {
+            var parens = (
+                   !(self.extends instanceof AST_SymbolRef)
+                && !(self.extends instanceof AST_PropAccess)
+                && !(self.extends instanceof AST_ClassExpression)
+                && !(self.extends instanceof AST_Function)
+            );
             output.print("extends");
+            if (parens) {
+                output.print("(");
+            } else {
                 output.space();
+            }
             self.extends.print(output);
+            if (parens) {
+                output.print(")");
+            } else {
                 output.space();
             }
+        }
         if (self.properties.length > 0) output.with_block(function(){
             self.properties.forEach(function(prop, i){
                 if (i) {
@@ -1494,7 +1566,8 @@ function OutputStream(options) {
     DEFPRINT(AST_NewTarget, function(self, output) {
         output.print("new.target");
     });
-    AST_ObjectProperty.DEFMETHOD("print_property_name", function(key, quote, output) {
+
+    function print_property_name(key, quote, output) {
         if (output.option("quote_keys")) {
             output.print_string(key + "");
         } else if ((typeof key == "number"
@@ -1511,7 +1584,8 @@ function OutputStream(options) {
         } else {
             output.print_string(key, quote);
         }
-    });
+    }
+
     DEFPRINT(AST_ObjectKeyVal, function(self, output){
         function get_name(self) {
             var def = self.definition();
@@ -1524,7 +1598,7 @@ function OutputStream(options) {
             is_identifier_string(self.key) &&
             get_name(self.value) === self.key
         ) {
-            self.print_property_name(self.key, self.quote, output);
+            print_property_name(self.key, self.quote, output);
 
         } else if (allowShortHand &&
             self.value instanceof AST_DefaultAssign &&
@@ -1532,12 +1606,14 @@ function OutputStream(options) {
             is_identifier_string(self.key) &&
             get_name(self.value.left) === self.key
         ) {
-            self.print_property_name(self.key, self.quote, output);
+            print_property_name(self.key, self.quote, output);
+            output.space();
             output.print("=");
+            output.space();
             self.value.right.print(output);
         } else {
             if (!(self.key instanceof AST_Node)) {
-                self.print_property_name(self.key, self.quote, output);
+                print_property_name(self.key, self.quote, output);
             } else {
                 output.with_square(function() {
                     self.key.print(output);
@@ -1547,15 +1623,18 @@ function OutputStream(options) {
             self.value.print(output);
         }
     });
-    AST_ObjectProperty.DEFMETHOD("_print_getter_setter", function(type, self, output) {
+    AST_ObjectProperty.DEFMETHOD("_print_getter_setter", function(type, output) {
+        var self = this;
         if (self.static) {
             output.print("static");
             output.space();
         }
+        if (type) {
             output.print(type);
             output.space();
+        }
         if (self.key instanceof AST_SymbolMethod) {
-            self.print_property_name(self.key.name, self.quote, output);
+            print_property_name(self.key.name, self.quote, output);
         } else {
             output.with_square(function() {
                 self.key.print(output);
@@ -1564,27 +1643,13 @@ function OutputStream(options) {
         self.value._do_print(output, true);
     });
     DEFPRINT(AST_ObjectSetter, function(self, output){
-        self._print_getter_setter("set", self, output);
+        self._print_getter_setter("set", output);
     });
     DEFPRINT(AST_ObjectGetter, function(self, output){
-        self._print_getter_setter("get", self, output);
+        self._print_getter_setter("get", output);
     });
     DEFPRINT(AST_ConciseMethod, function(self, output){
-        if (self.static) {
+        self._print_getter_setter(self.is_generator && "*" || self.async && "async", output);
-            output.print("static");
-            output.space();
-        }
-        if (self.is_generator) {
-            output.print("*");
-        }
-        if (self.key instanceof AST_SymbolMethod) {
-            self.print_property_name(self.key.name, self.quote, output);
-        } else {
-            output.with_square(function() {
-                self.key.print(output);
-            });
-        }
-        self.value._do_print(output, true);
     });
     AST_Symbol.DEFMETHOD("_do_print", function(output){
         var def = this.definition();
@@ -1617,45 +1682,14 @@ function OutputStream(options) {
         }
     });
 
-    function regexp_safe_literal(code) {
-        return [
-            0x5c   , // \
-            0x2f   , // /
-            0x2e   , // .
-            0x2b   , // +
-            0x2a   , // *
-            0x3f   , // ?
-            0x28   , // (
-            0x29   , // )
-            0x5b   , // [
-            0x5d   , // ]
-            0x7b   , // {
-            0x7d   , // }
-            0x24   , // $
-            0x5e   , // ^
-            0x3a   , // :
-            0x7c   , // |
-            0x21   , // !
-            0x0a   , // \n
-            0x0d   , // \r
-            0x00   , // \0
-            0xfeff , // Unicode BOM
-            0x2028 , // unicode "line separator"
-            0x2029 , // unicode "paragraph separator"
-        ].indexOf(code) < 0;
-    };
-
     DEFPRINT(AST_RegExp, function(self, output){
-        var str = self.getValue().toString();
+        var regexp = self.getValue();
+        var str = regexp.toString();
+        if (regexp.raw_source) {
+            str = "/" + regexp.raw_source + str.slice(str.lastIndexOf("/"));
+        }
         if (output.option("ascii_only")) {
             str = output.to_ascii(str);
-        } else if (output.option("unescape_regexps")) {
-            str = str.split("\\\\").map(function(str){
-                return str.replace(/\\u[0-9a-fA-F]{4}|\\x[0-9a-fA-F]{2}/g, function(s){
-                    var code = parseInt(s.substr(2), 16);
-                    return regexp_safe_literal(code) ? String.fromCharCode(code) : s;
-                });
-            }).join("\\\\");
         }
         output.print(str);
         var p = output.parent();

lib/parse.js

@@ -47,7 +47,7 @@
 var KEYWORDS = 'break case catch class const continue debugger default delete do else export extends finally for function if in instanceof new return switch throw try typeof var let void while with import';
 var KEYWORDS_ATOM = 'false null true';
 var RESERVED_WORDS = 'enum implements interface package private protected public static super this ' + KEYWORDS_ATOM + " " + KEYWORDS;
-var KEYWORDS_BEFORE_EXPRESSION = 'return new delete throw else case yield';
+var KEYWORDS_BEFORE_EXPRESSION = 'return new delete throw else case yield await';
 
 KEYWORDS = makePredicate(KEYWORDS);
 RESERVED_WORDS = makePredicate(RESERVED_WORDS);
@@ -122,8 +122,6 @@ var PUNC_BEFORE_EXPRESSION = makePredicate(characters("[{(,;:"));
 
 var PUNC_CHARS = makePredicate(characters("[]{}(),;:"));
 
-var REGEXP_MODIFIERS = makePredicate(characters("gmsiy"));
-
 /* -----[ Tokenizer ]----- */
 
 // surrogate safe regexps adapted from https://github.com/mathiasbynens/unicode-8.0.0/tree/89b412d8a71ecca9ed593d9e9fa073ab64acfebe/Binary_Property
@@ -345,7 +343,11 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
                            (type == "keyword" && KEYWORDS_BEFORE_EXPRESSION(value)) ||
                            (type == "punc" && PUNC_BEFORE_EXPRESSION(value))) ||
                            (type == "arrow");
-        prev_was_dot = (type == "punc" && value == ".");
+        if (type == "punc" && value == ".") {
+            prev_was_dot = true;
+        } else if (!is_comment) {
+            prev_was_dot = false;
+        }
         var ret = {
             type    : type,
             value   : value,
@@ -607,29 +609,31 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
         return name;
     });
 
-    var read_regexp = with_eof_error("Unterminated regular expression", function(regexp){
+    var read_regexp = with_eof_error("Unterminated regular expression", function(source) {
         var prev_backslash = false, ch, in_class = false;
         while ((ch = next(true))) if (NEWLINE_CHARS(ch)) {
             parse_error("Unexpected line terminator");
         } else if (prev_backslash) {
-            regexp += "\\" + ch;
+            source += "\\" + ch;
             prev_backslash = false;
         } else if (ch == "[") {
             in_class = true;
-            regexp += ch;
+            source += ch;
         } else if (ch == "]" && in_class) {
             in_class = false;
-            regexp += ch;
+            source += ch;
         } else if (ch == "/" && !in_class) {
             break;
         } else if (ch == "\\") {
             prev_backslash = true;
         } else {
-            regexp += ch;
+            source += ch;
         }
         var mods = read_name();
         try {
-          return token("regexp", new RegExp(regexp, mods));
+            var regexp = new RegExp(source, mods);
+            regexp.raw_source = source;
+            return token("regexp", regexp);
         } catch(e) {
             parse_error(e.message);
         }
@@ -844,9 +848,7 @@ var PRECEDENCE = (function(a, ret){
     {}
 );
 
-var STATEMENTS_WITH_LABELS = array_to_hash([ "for", "do", "while", "switch" ]);
+var ATOMIC_START_TOKEN = makePredicate([ "atom", "num", "string", "regexp", "name" ]);
-
-var ATOMIC_START_TOKEN = array_to_hash([ "atom", "num", "string", "regexp", "name" ]);
 
 /* -----[ Parser ]----- */
 
@@ -860,7 +862,7 @@ function parse($TEXT, options) {
         shebang        : true,
         strict         : false,
         toplevel       : null,
-    });
+    }, true);
 
     var S = {
         input         : (typeof $TEXT == "string"
@@ -871,6 +873,7 @@ function parse($TEXT, options) {
         prev          : null,
         peeked        : null,
         in_function   : 0,
+        in_async      : -1,
         in_generator  : -1,
         in_directives : true,
         in_loop       : 0,
@@ -941,6 +944,10 @@ function parse($TEXT, options) {
         return S.in_generator === S.in_function;
     }
 
+    function is_in_async() {
+        return S.in_async === S.in_function;
+    }
+
     function semicolon(optional) {
         if (is("punc", ";")) next();
         else if (!optional && !can_insert_semicolon()) unexpected();
@@ -972,17 +979,16 @@ function parse($TEXT, options) {
     };
 
     var statement = embed_tokens(function() {
-        var tmp;
         handle_regexp();
         switch (S.token.type) {
           case "string":
             if (S.in_directives) {
-                tmp = peek();
+                var token = peek();
                 if (S.token.raw.indexOf("\\") == -1
-                    && (tmp.nlb
+                    && (token.nlb
-                        || is_token(tmp, "eof")
+                        || is_token(token, "eof")
-                        || is_token(tmp, "punc", ";")
+                        || is_token(token, "punc", ";")
-                        || is_token(tmp, "punc", "}"))) {
+                        || is_token(token, "punc", "}"))) {
                     S.input.add_directive(S.token.value);
                 } else {
                     S.in_directives = false;
@@ -998,6 +1004,11 @@ function parse($TEXT, options) {
             return simple_statement();
 
           case "name":
+            if (S.token.value == "async" && is_token(peek(), "keyword", "function")) {
+                next();
+                next();
+                return function_(AST_Defun, false, true);
+            }
             return is_token(peek(), "punc", ":")
                 ? labeled_statement()
                 : simple_statement();
@@ -1022,90 +1033,126 @@ function parse($TEXT, options) {
             }
 
           case "keyword":
-            switch (tmp = S.token.value, next(), tmp) {
+            switch (S.token.value) {
               case "break":
+                next();
                 return break_cont(AST_Break);
 
               case "continue":
+                next();
                 return break_cont(AST_Continue);
 
               case "debugger":
+                next();
                 semicolon();
                 return new AST_Debugger();
 
               case "do":
+                next();
+                var body = in_loop(statement);
+                expect_token("keyword", "while");
+                var condition = parenthesised();
+                semicolon(true);
                 return new AST_Do({
-                    body      : in_loop(statement),
+                    body      : body,
-                    condition : (expect_token("keyword", "while"), tmp = parenthesised(), semicolon(true), tmp)
+                    condition : condition
                 });
 
               case "while":
+                next();
                 return new AST_While({
                     condition : parenthesised(),
                     body      : in_loop(statement)
                 });
 
               case "for":
+                next();
                 return for_();
 
               case "class":
+                next();
                 return class_(AST_DefClass);
 
               case "function":
+                next();
                 return function_(AST_Defun);
 
               case "if":
+                next();
                 return if_();
 
               case "return":
                 if (S.in_function == 0 && !options.bare_returns)
                     croak("'return' outside of function");
+                next();
+                var value = null;
+                if (is("punc", ";")) {
+                    next();
+                } else if (!can_insert_semicolon()) {
+                    value = expression(true);
+                    semicolon();
+                }
                 return new AST_Return({
-                    value: ( is("punc", ";")
+                    value: value
-                             ? (next(), null)
-                             : can_insert_semicolon()
-                             ? null
-                             : (tmp = expression(true), semicolon(), tmp) )
                 });
 
               case "switch":
+                next();
                 return new AST_Switch({
                     expression : parenthesised(),
                     body       : in_loop(switch_body_)
                 });
 
               case "throw":
+                next();
                 if (S.token.nlb)
                     croak("Illegal newline after 'throw'");
+                var value = expression(true);
+                semicolon();
                 return new AST_Throw({
-                    value: (tmp = expression(true), semicolon(), tmp)
+                    value: value
                 });
 
               case "try":
+                next();
                 return try_();
 
               case "var":
-                return tmp = var_(), semicolon(), tmp;
+                next();
+                var node = var_();
+                semicolon();
+                return node;
 
               case "let":
-                return tmp = let_(), semicolon(), tmp;
+                next();
+                var node = let_();
+                semicolon();
+                return node;
 
               case "const":
-                return tmp = const_(), semicolon(), tmp;
+                next();
+                var node = const_();
+                semicolon();
+                return node;
 
               case "with":
                 if (S.input.has_directive("use strict")) {
                     croak("Strict mode may not include a with statement");
                 }
+                next();
                 return new AST_With({
                     expression : parenthesised(),
                     body       : statement()
                 });
 
               case "import":
-                return tmp = import_(), semicolon(), tmp;
+                next();
+                var node = import_();
+                semicolon();
+                return node;
 
               case "export":
+                next();
                 return export_();
             }
         }
@@ -1118,6 +1165,9 @@ function parse($TEXT, options) {
             // Ecma-262, 12.1.1 Static Semantics: Early Errors
             token_error(S.prev, "Yield cannot be used as label inside generators");
         }
+        if (label.name === "await" && is_in_async()) {
+            token_error(S.prev, "await cannot be used as label inside async function");
+        }
         if (find_if(function(l){ return l.name == label.name }, S.labels)) {
             // ECMA-262, 12.12: An ECMAScript program is considered
             // syntactically incorrect if it contains a
@@ -1231,33 +1281,25 @@ function parse($TEXT, options) {
         });
     };
 
-    var arrow_function = function(args) {
+    var arrow_function = function(start, argnames) {
         if (S.token.nlb) {
             croak("Unexpected newline before arrow (=>)");
         }
 
         expect_token("arrow", "=>");
 
-        var argnames;
+        var body = _function_body(is("punc", "{"));
-        if (typeof args.length === 'number') {
-            argnames = args;
-        } else {
-            argnames = args.as_params(croak);
-        }
-
-        var body = is("punc", "{") ?
-            _function_body(true) :
-            _function_body(false);
 
         return new AST_Arrow({
-            start    : args.start,
+            start    : start,
             end      : body.end,
             argnames : argnames,
             body     : body
         });
     };
 
-    var function_ = function(ctor, is_generator_property) {
+    var function_ = function(ctor, is_generator_property, is_async) {
+        if (is_generator_property && is_async) croak("generators cannot be async");
         var start = S.token
 
         var in_statement = ctor === AST_Defun;
@@ -1271,11 +1313,12 @@ function parse($TEXT, options) {
             unexpected();
 
         var args = parameters();
-        var body = _function_body(true, is_generator || is_generator_property, name, args);
+        var body = _function_body(true, is_generator || is_generator_property, is_async, name, args);
         return new ctor({
             start : args.start,
             end   : body.end,
             is_generator: is_generator,
+            async : is_async,
             name  : name,
             argnames: args,
             body  : body
@@ -1574,8 +1617,6 @@ function parse($TEXT, options) {
     }
 
     function params_or_seq_() {
-        var start = S.token
-        expect("(");
         var first = true;
         var a = [];
         while (!is("punc", ")")) {
@@ -1585,32 +1626,29 @@ function parse($TEXT, options) {
                 next();
                 a.push(new AST_Expansion({
                     start: prev(),
-                    expression: expression(false),
+                    expression: expression(),
                     end: S.token,
                 }));
                 if (!is("punc", ")")) {
                     unexpected(spread_token);
                 }
             } else {
-                a.push(expression(false));
+                a.push(expression());
             }
         }
-        var end = S.token
+        return a;
-        next();
-        return new AST_ArrowParametersOrSeq({
-            start: start,
-            end: end,
-            expressions: a
-        });
     }
 
-    function _function_body(block, generator, name, args) {
+    function _function_body(block, generator, is_async, name, args) {
         var loop = S.in_loop;
         var labels = S.labels;
         var current_generator = S.in_generator;
+        var current_async = S.in_async;
         ++S.in_function;
         if (generator)
             S.in_generator = S.in_function;
+        if (is_async)
+            S.in_async = S.in_function;
         if (block)
             S.in_directives = true;
         S.in_loop = 0;
@@ -1630,9 +1668,22 @@ function parse($TEXT, options) {
         S.in_loop = loop;
         S.labels = labels;
         S.in_generator = current_generator;
+        S.in_async = current_async;
         return a;
     }
 
+    function _await_expression() {
+        // Previous token must be "await" and not be interpreted as an identifier
+        if (!is_in_async()) {
+            croak("Unexpected await expression outside async function",
+                S.prev.line, S.prev.col, S.prev.pos);
+        }
+        // the await expression is parsed as a unary expression in Babel
+        return new AST_Await({
+            expression : maybe_unary(true),
+        });
+    }
+
     function _yield_expression() {
         // Previous token must be keyword yield and not be interpret as an identifier
         if (!is_in_generator()) {
@@ -1641,7 +1692,6 @@ function parse($TEXT, options) {
         }
         var star = false;
         var has_expression = true;
-        var tmp;
 
         // Attempt to get expression or star (and then the mandatory expression)
         // behind yield on the same line.
@@ -1848,7 +1898,6 @@ function parse($TEXT, options) {
         var tok = S.token, ret;
         switch (tok.type) {
           case "name":
-          case "keyword":
             ret = _make_symbol(AST_SymbolRef);
             break;
           case "num":
@@ -1878,18 +1927,68 @@ function parse($TEXT, options) {
                 break;
             }
             break;
-          case "operator":
-            if (!is_identifier_string(tok.value)) {
-                croak("Invalid getter/setter name: " + tok.value,
-                    tok.line, tok.col, tok.pos);
-            }
-            ret = _make_symbol(AST_SymbolRef);
-            break;
         }
         next();
         return ret;
     };
 
+    function to_fun_args(ex, _, __, default_seen_above) {
+        var insert_default = function(ex, default_value) {
+            if (default_value) {
+                return new AST_DefaultAssign({
+                    start: ex.start,
+                    left: ex,
+                    operator: "=",
+                    right: default_value,
+                    end: default_value.end
+                });
+            }
+            return ex;
+        }
+        if (ex instanceof AST_Object) {
+            return insert_default(new AST_Destructuring({
+                start: ex.start,
+                end: ex.end,
+                is_array: false,
+                names: ex.properties.map(to_fun_args)
+            }), default_seen_above);
+        } else if (ex instanceof AST_ObjectKeyVal) {
+            if (ex.key instanceof AST_SymbolRef) {
+                ex.key = to_fun_args(ex.key, 0, [ex.key]);
+            }
+            ex.value = to_fun_args(ex.value, 0, [ex.key]);
+            return insert_default(ex, default_seen_above);
+        } else if (ex instanceof AST_Hole) {
+            return ex;
+        } else if (ex instanceof AST_Destructuring) {
+            ex.names = ex.names.map(to_fun_args);
+            return insert_default(ex, default_seen_above);
+        } else if (ex instanceof AST_SymbolRef) {
+            return insert_default(new AST_SymbolFunarg({
+                name: ex.name,
+                start: ex.start,
+                end: ex.end
+            }), default_seen_above);
+        } else if (ex instanceof AST_Expansion) {
+            ex.expression = to_fun_args(ex.expression);
+            return insert_default(ex, default_seen_above);
+        } else if (ex instanceof AST_Array) {
+            return insert_default(new AST_Destructuring({
+                start: ex.start,
+                end: ex.end,
+                is_array: true,
+                names: ex.elements.map(to_fun_args)
+            }), default_seen_above);
+        } else if (ex instanceof AST_Assign) {
+            return insert_default(to_fun_args(ex.left, undefined, undefined, ex.right), default_seen_above);
+        } else if (ex instanceof AST_DefaultAssign) {
+            ex.left = to_fun_args(ex.left, 0, [ex.left]);
+            return ex;
+        } else {
+            croak("Invalid function parameter", ex.start.line, ex.start.col);
+        }
+    }
+
     var expr_atom = function(allow_calls) {
         if (is("operator", "new")) {
             return new_(allow_calls);
@@ -1898,23 +1997,33 @@ function parse($TEXT, options) {
         if (is("punc")) {
             switch (start.value) {
               case "(":
-                var ex = params_or_seq_();
+                next();
+                var exprs = params_or_seq_();
+                expect(")");
                 if (is("arrow", "=>")) {
-                    ex.start = start;
+                    return arrow_function(start, exprs.map(to_fun_args));
-                    ex.end = S.token;
-                    return arrow_function(ex);
                 }
-                ex = ex.as_expr(croak);
+                var ex = exprs.length == 1 ? exprs[0] : new AST_Sequence({
+                    expressions: exprs
+                });
                 ex.start = start;
                 ex.end = S.token;
                 return subscripts(ex, allow_calls);
               case "[":
                 return subscripts(array_(), allow_calls);
               case "{":
-                return subscripts(object_or_object_destructuring_(), allow_calls);
+                return subscripts(object_or_destructuring_(), allow_calls);
             }
             unexpected();
         }
+        if (is("name", "async") && is_token(peek(), "keyword", "function")) {
+            next();
+            next();
+            var func = function_(AST_Function, false, true);
+            func.start = start;
+            func.end = prev();
+            return subscripts(func, allow_calls);
+        }
         if (is("keyword", "function")) {
             next();
             var func = function_(AST_Function);
@@ -1932,7 +2041,7 @@ function parse($TEXT, options) {
         if (is("template_head")) {
             return subscripts(template_string(), allow_calls);
         }
-        if (ATOMIC_START_TOKEN[S.token.type]) {
+        if (ATOMIC_START_TOKEN(S.token.type)) {
             return subscripts(as_atom_node(), allow_calls);
         }
         unexpected();
@@ -1996,11 +2105,11 @@ function parse($TEXT, options) {
         });
     });
 
-    var create_accessor = embed_tokens(function(is_generator) {
+    var create_accessor = embed_tokens(function(is_generator, is_async) {
-        return function_(AST_Accessor, is_generator);
+        return function_(AST_Accessor, is_generator, is_async);
     });
 
-    var object_or_object_destructuring_ = embed_tokens(function() {
+    var object_or_destructuring_ = embed_tokens(function object_or_destructuring_() {
         var start = S.token, first = true, a = [];
         expect("{");
         while (!is("punc", "}")) {
@@ -2113,6 +2222,7 @@ function parse($TEXT, options) {
             }
             return name;
         }
+        var is_async = false;
         var is_static = false;
         var is_generator = false;
         var property_token = start;
@@ -2121,6 +2231,11 @@ function parse($TEXT, options) {
             property_token = S.token;
             name = as_property_name();
         }
+        if (name === "async" && !is("punc", "(") && !is("punc", ",") && !is("punc", "}")) {
+            is_async = true;
+            property_token = S.token;
+            name = as_property_name();
+        }
         if (name === null) {
             is_generator = true;
             property_token = S.token;
@@ -2135,10 +2250,11 @@ function parse($TEXT, options) {
                 start       : start,
                 static      : is_static,
                 is_generator: is_generator,
+                async       : is_async,
                 key         : name,
                 quote       : name instanceof AST_SymbolMethod ?
                               property_token.quote : undefined,
-                value       : create_accessor(is_generator),
+                value       : create_accessor(is_generator, is_async),
                 end         : prev()
             });
             return node;
@@ -2334,14 +2450,28 @@ function parse($TEXT, options) {
             }
         }
 
-        var is_definition =
+        var is_definition = is("keyword", "var") || is("keyword", "let") || is("keyword", "const");
-            is("keyword", "var") || is("keyword", "let") || is("keyword", "const") ||
-            is("keyword", "class") || is("keyword", "function");
-
         if (is_definition) {
+            if (is_default) unexpected();
             exported_definition = statement();
+        } else if (is("keyword", "class")) {
+            var cls = expr_atom(false);
+            if (cls.name) {
+                cls.name = new AST_SymbolDefClass(cls.name);
+                exported_definition = new AST_DefClass(cls);
             } else {
-            exported_value = expression();
+                exported_value = cls;
+            }
+        } else if (is("keyword", "function")) {
+            var func = expr_atom(false);
+            if (func.name) {
+                func.name = new AST_SymbolDefun(func.name);
+                exported_definition = new AST_Defun(func);
+            } else {
+                exported_value = func;
+            }
+        } else {
+            exported_value = expression(false);
             semicolon();
         }
 
@@ -2373,7 +2503,8 @@ function parse($TEXT, options) {
                 unexpected(tmp);
             }
           case "name":
-            if (tmp.value === "yield" && S.input.has_directive("use strict") && !is_in_generator()) {
+            if (tmp.value == "yield" && !is_token(peek(), "punc", ":")
+                && S.input.has_directive("use strict") && !is_in_generator()) {
                 token_error(tmp, "Unexpected yield identifier inside strict mode");
             }
           case "string":
@@ -2488,6 +2619,14 @@ function parse($TEXT, options) {
 
     var maybe_unary = function(allow_calls) {
         var start = S.token;
+        if (start.type == "name" && start.value == "await") {
+            if (is_in_async()) {
+                next();
+                return _await_expression();
+            } else if (S.input.has_directive("use strict")) {
+                token_error(S.token, "Unexpected await identifier inside strict mode")
+            }
+        }
         if (is("operator") && UNARY_PREFIX(start.value)) {
             next();
             handle_regexp();
@@ -2629,7 +2768,7 @@ function parse($TEXT, options) {
         if (start.type == "punc" && start.value == "(" && peek().value == ")") {
             next();
             next();
-            return arrow_function([]);
+            return arrow_function(start, []);
         }
 
         if (is("name") && is_token(peek(), "arrow")) {
@@ -2639,7 +2778,7 @@ function parse($TEXT, options) {
                 end: start,
             });
             next();
-            return arrow_function([param])
+            return arrow_function(start, [param]);
         }
 
         var left = maybe_conditional(no_in);
@@ -2670,16 +2809,7 @@ function parse($TEXT, options) {
             next();
             commas = true;
         }
-        if (exprs.length == 1) {
+        return exprs.length == 1 ? exprs[0] : new AST_Sequence({
-            var expr = exprs[0];
-            if (!(expr instanceof AST_SymbolRef) || !is("arrow", "=>")) return expr;
-            return arrow_function(new AST_ArrowParametersOrSeq({
-                start: expr.start,
-                end: expr.end,
-                expressions: [expr]
-            }));
-        }
-        return new AST_Sequence({
             start       : start,
             expressions : exprs,
             end         : peek()

lib/propmangle.js

@@ -96,7 +96,8 @@ function mangle_properties(ast, options) {
         reserved: null,
     });
 
-    var reserved = options.reserved || [];
+    var reserved = options.reserved;
+    if (!Array.isArray(reserved)) reserved = [];
     if (!options.builtins) find_builtins(reserved);
 
     var cache = options.cache;

lib/scope.js

@@ -51,7 +51,6 @@ function SymbolDef(scope, index, orig) {
     this.global = false;
     this.export = false;
     this.mangled_name = null;
-    this.object_destructuring_arg = false;
     this.undeclared = false;
     this.index = index;
     this.id = SymbolDef.next_id++;
@@ -65,7 +64,6 @@ SymbolDef.prototype = {
 
         return (this.global && !options.toplevel)
             || this.export
-            || this.object_destructuring_arg
             || this.undeclared
             || (!options.eval && (this.scope.uses_eval || this.scope.uses_with))
             || (options.keep_fnames
@@ -111,8 +109,6 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
     var labels = new Dictionary();
     var defun = null;
     var in_destructuring = null;
-    var in_export = false;
-    var in_block = 0;
     var for_scopes = [];
     var tw = new TreeWalker(function(node, descend){
         if (node.is_block_scope()) {
@@ -152,22 +148,6 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
             labels = save_labels;
             return true;        // don't descend again in TreeWalker
         }
-        if (node instanceof AST_Export) {
-            in_export = true;
-            descend();
-            in_export = false;
-            return true;
-        }
-        if (node instanceof AST_BlockStatement
-            || node instanceof AST_Switch
-            || node instanceof AST_Try
-            || node instanceof AST_Catch
-            || node instanceof AST_Finally) {
-            in_block++;
-            descend();
-            in_block--;
-            return true;
-        }
         if (node instanceof AST_LabeledStatement) {
             var l = node.label;
             if (labels.has(l.name)) {
@@ -186,15 +166,12 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
         if (node instanceof AST_Symbol) {
             node.scope = scope;
         }
-        if (node instanceof AST_SymbolFunarg) {
-            node.object_destructuring_arg = !!in_destructuring;
-        }
         if (node instanceof AST_Label) {
             node.thedef = node;
             node.references = [];
         }
         if (node instanceof AST_SymbolLambda) {
-            defun.def_function(node, in_export, in_block);
+            defun.def_function(node);
         }
         else if (node instanceof AST_SymbolDefun) {
             // Careful here, the scope where this should be defined is
@@ -206,23 +183,24 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
             while (parent_lambda.is_block_scope()) {
                 parent_lambda = parent_lambda.parent_scope;
             }
-            (node.scope = parent_lambda).def_function(node, in_export, in_block);
+            mark_export((node.scope = parent_lambda).def_function(node), 1);
         }
         else if (node instanceof AST_SymbolClass) {
-            defun.def_variable(node, in_export, in_block);
+            mark_export(defun.def_variable(node), 1);
         }
         else if (node instanceof AST_SymbolImport) {
-            scope.def_variable(node, in_export, in_block);
+            scope.def_variable(node);
         }
         else if (node instanceof AST_SymbolDefClass) {
             // This deals with the name of the class being available
             // inside the class.
-            (node.scope = defun.parent_scope).def_function(node, in_export, in_block);
+            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, in_export, in_block);
+            var def = ((node instanceof AST_SymbolBlockDeclaration) ? scope : defun).def_variable(node);
+            if (!(node instanceof AST_SymbolFunarg)) mark_export(def, 2);
             def.destructuring = in_destructuring;
             if (defun !== scope) {
                 node.mark_enclosed(options);
@@ -234,7 +212,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
             }
         }
         else if (node instanceof AST_SymbolCatch) {
-            scope.def_variable(node, in_export, in_block).defun = defun;
+            scope.def_variable(node).defun = defun;
         }
         else if (node instanceof AST_LabelRef) {
             var sym = labels.get(node.name);
@@ -245,28 +223,17 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
             }));
             node.thedef = sym;
         }
+
+        function mark_export(def, level) {
+            var node = tw.parent(level);
+            def.export = node instanceof AST_Export && !node.is_default;
+        }
     });
     self.walk(tw);
 
     // pass 2: find back references and eval
-    var func = null;
+    self.globals = new Dictionary();
-    var cls = null;
-    var globals = self.globals = new Dictionary();
     var tw = new TreeWalker(function(node, descend){
-        if (node instanceof AST_Lambda) {
-            var prev_func = func;
-            func = node;
-            descend();
-            func = prev_func;
-            return true;
-        }
-        if (node instanceof AST_Class) {
-            var prev_cls = cls;
-            cls = node;
-            descend();
-            cls = prev_cls;
-            return true;
-        }
         if (node instanceof AST_LoopControl && node.label) {
             node.label.thedef.references.push(node);
             return true;
@@ -279,11 +246,10 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
                 }
             }
             var sym = node.scope.find_variable(name);
-            if (node.scope instanceof AST_Lambda && name == "arguments") {
-                node.scope.uses_arguments = true;
-            }
             if (!sym) {
                 sym = self.def_global(node);
+            } else if (sym.scope instanceof AST_Lambda && name == "arguments") {
+                sym.scope.uses_arguments = true;
             }
             node.thedef = sym;
             node.reference(options);
@@ -351,22 +317,13 @@ 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", function(){
+AST_Node.DEFMETHOD("is_block_scope", return_false);
-    return false; // Behaviour will be overridden by AST_Block
+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_Block.DEFMETHOD("is_block_scope", function(){
+AST_SwitchBranch.DEFMETHOD("is_block_scope", return_false);
-    return (
+AST_Block.DEFMETHOD("is_block_scope", return_true);
-        !(this instanceof AST_Lambda) &&
+AST_IterationStatement.DEFMETHOD("is_block_scope", return_true);
-        !(this instanceof AST_Toplevel) &&
-        !(this instanceof AST_Class) &&
-        !(this instanceof AST_SwitchBranch)
-    );
-});
-
-AST_IterationStatement.DEFMETHOD("is_block_scope", function(){
-     return true;
-});
 
 AST_Lambda.DEFMETHOD("init_scope_vars", function(){
     AST_Scope.prototype.init_scope_vars.apply(this, arguments);
@@ -404,24 +361,18 @@ AST_Scope.DEFMETHOD("find_variable", function(name){
         || (this.parent_scope && this.parent_scope.find_variable(name));
 });
 
-AST_Scope.DEFMETHOD("def_function", function(symbol, in_export, in_block){
+AST_Scope.DEFMETHOD("def_function", function(symbol){
-    this.functions.set(symbol.name, this.def_variable(symbol, in_export, in_block));
+    var def = this.def_variable(symbol);
+    this.functions.set(symbol.name, def);
+    return def;
 });
 
-AST_Scope.DEFMETHOD("def_variable", function(symbol, in_export, in_block){
+AST_Scope.DEFMETHOD("def_variable", function(symbol){
     var def;
     if (!this.variables.has(symbol.name)) {
         def = new SymbolDef(this, this.variables.size(), symbol);
         this.variables.set(symbol.name, def);
-        def.object_destructuring_arg = symbol.object_destructuring_arg;
-        if (in_export) {
-            def.export = true;
-        }
-        if (in_block && symbol instanceof AST_SymbolBlockDeclaration) {
-            def.global = false;
-        } else {
         def.global = !this.parent_scope;
-        }
     } else {
         def = this.variables.get(symbol.name);
         def.orig.push(symbol);
@@ -474,9 +425,7 @@ AST_Symbol.DEFMETHOD("unmangleable", function(options){
 });
 
 // labels are always mangleable
-AST_Label.DEFMETHOD("unmangleable", function(){
+AST_Label.DEFMETHOD("unmangleable", return_false);
-    return false;
-});
 
 AST_Symbol.DEFMETHOD("unreferenced", function(){
     return this.definition().references.length == 0
@@ -487,13 +436,9 @@ AST_Symbol.DEFMETHOD("undeclared", function(){
     return this.definition().undeclared;
 });
 
-AST_LabelRef.DEFMETHOD("undeclared", function(){
+AST_LabelRef.DEFMETHOD("undeclared", return_false);
-    return false;
-});
 
-AST_Label.DEFMETHOD("undeclared", function(){
+AST_Label.DEFMETHOD("undeclared", return_false);
-    return false;
-});
 
 AST_Symbol.DEFMETHOD("definition", function(){
     return this.thedef;
@@ -504,7 +449,7 @@ AST_Symbol.DEFMETHOD("global", function(){
 });
 
 AST_Toplevel.DEFMETHOD("_default_mangler_options", function(options){
-    return defaults(options, {
+    options = defaults(options, {
         eval        : false,
         ie8         : false,
         keep_classnames: false,
@@ -512,6 +457,8 @@ AST_Toplevel.DEFMETHOD("_default_mangler_options", function(options){
         reserved    : [],
         toplevel    : false,
     });
+    if (!Array.isArray(options.reserved)) options.reserved = [];
+    return options;
 });
 
 AST_Toplevel.DEFMETHOD("mangle_names", function(options){
@@ -569,7 +516,6 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options){
     });
     this.walk(tw);
     to_mangle.forEach(function(def){
-        if (def.destructuring && !def.destructuring.is_array) return;
         def.mangle(options);
     });
 
@@ -643,6 +589,8 @@ AST_Toplevel.DEFMETHOD("compute_char_frequency", function(options){
             base54.consider("finally");
         else if (node instanceof AST_Yield)
             base54.consider("yield");
+        else if (node instanceof AST_Await)
+            base54.consider("await");
         else if (node instanceof AST_Symbol && node.unmangleable(options))
             base54.consider(node.name);
         else if (node instanceof AST_Unary || node instanceof AST_Binary)

lib/transform.js

@@ -199,6 +199,10 @@ TreeTransformer.prototype = new TreeWalker;
         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);
     });
@@ -240,6 +244,7 @@ TreeTransformer.prototype = new TreeWalker;
     });
 
     _(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);
     });
 

lib/utils.js

@@ -43,13 +43,6 @@
 
 "use strict";
 
-function array_to_hash(a) {
-    var ret = Object.create(null);
-    for (var i = 0; i < a.length; ++i)
-        ret[a[i]] = true;
-    return ret;
-};
-
 function slice(a, start) {
     return Array.prototype.slice.call(a, start || 0);
 };

package.json

@@ -4,7 +4,7 @@
   "homepage": "https://github.com/mishoo/UglifyJS2/tree/harmony",
   "author": "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)",
   "license": "BSD-2-Clause",
-  "version": "3.0.5",
+  "version": "3.0.18",
   "engines": {
     "node": ">=0.8.0"
   },
@@ -34,10 +34,11 @@
   },
   "devDependencies": {
     "acorn": "~5.0.3",
-    "mocha": "~2.3.4"
+    "mocha": "~2.3.4",
+    "semver": "~5.3.0"
   },
   "scripts": {
     "test": "node test/run-tests.js"
   },
-  "keywords": ["uglify", "uglify-js", "minify", "minifier"]
+  "keywords": ["uglify", "uglify-js", "uglify-es", "minify", "minifier", "es5", "es6", "es2015"]
 }

test/benchmark.js

@@ -4,12 +4,13 @@
 "use strict";
 
 var createHash = require("crypto").createHash;
+var fetch = require("./fetch");
 var fork = require("child_process").fork;
 var args = process.argv.slice(2);
 if (!args.length) {
     args.push("-mc");
 }
-args.push("--stats");
+args.push("--timings");
 var urls = [
     "https://code.jquery.com/jquery-3.2.1.js",
     "https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.4/angular.js",
@@ -29,12 +30,7 @@ function done() {
             var info = results[url];
             console.log();
             console.log(url);
-            var elapsed = 0;
+            console.log(info.log);
-            console.log(info.log.replace(/Elapsed: ([0-9]+)\s*/g, function(match, time) {
-                elapsed += 1e-3 * parseInt(time);
-                return "";
-            }));
-            console.log("Run-time:", elapsed.toFixed(3), "s");
             console.log("Original:", info.input, "bytes");
             console.log("Uglified:", info.output, "bytes");
             console.log("SHA1 sum:", info.sha1);
@@ -57,7 +53,8 @@ urls.forEach(function(url) {
         output: 0,
         log: ""
     };
-    require(url.slice(0, url.indexOf(":"))).get(url, function(res) {
+    fetch(url, function(err, res) {
+        if (err) throw err;
         var uglifyjs = fork("bin/uglifyjs", args, { silent: true });
         res.on("data", function(data) {
             results[url].input += data.length;

test/compress/arrow.js

@@ -135,3 +135,70 @@ arrow_with_regexp: {
         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"
+}

test/compress/async.js

@@ -0,0 +1,245 @@
+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)}"
+}
+
+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_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: {
+        let async = function(x){ console.log("async", x); };
+        let await = function(x){ console.log("await", x); };
+        async(1);
+        await(2);
+    }
+    expect: {
+        let async = function(x){ console.log("async", x); };
+        let await = function(x){ console.log("await", x); };
+        async(1);
+        await(2);
+    }
+    expect_stdout: [
+        "async 1",
+        "await 2",
+    ]
+    node_version: ">=8"
+}
+
+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"
+}
+
+/* FIXME: add test when supported by parser
+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, y); }
+    }
+    expect: {
+    }
+}
+*/

test/compress/blocks.js

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

test/compress/collapse_vars.js

@@ -1146,7 +1146,7 @@ collapse_vars_constants: {
         function f3(x) {
             var b = x.prop;
             sideeffect1();
-            return b + -9;
+            return b + (function() { return -9; })();
         }
     }
 }

test/compress/dead-code.js

@@ -31,7 +31,7 @@ dead_code_2_should_warn: {
         function f() {
             g();
             x = 10;
-            throw "foo";
+            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.
@@ -46,16 +46,60 @@ dead_code_2_should_warn: {
                 })();
             }
         }
+        f();
     }
     expect: {
         function f() {
             g();
             x = 10;
-            throw "foo";
+            throw new Error("foo");
+            var x;
+            var 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"
 }
 
 dead_code_constant_boolean_should_warn_more: {
@@ -78,16 +122,55 @@ dead_code_constant_boolean_should_warn_more: {
             foo();
             var moo;
         }
+        bar();
     }
     expect: {
         var foo;
-        function bar() {}
+        var bar;
         // nothing for the while
         // as for the for, it should keep:
         var x = 10, y;
         var moo;
+        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 x = 10, y;
+        var moo;
+        bar();
+    }
+    expect_stdout: true
+    node_version: ">=4"
 }
 
 dead_code_block_decls_die: {
@@ -134,7 +217,7 @@ dead_code_const_declaration: {
         var unused;
         const CONST_FOO = !1;
         var moo;
-        function bar() {}
+        var bar;
     }
     expect_stdout: true
 }
@@ -162,7 +245,7 @@ dead_code_const_annotation: {
         var unused;
         var CONST_FOO_ANN = !1;
         var moo;
-        function bar() {}
+        var bar;
     }
     expect_stdout: true
 }
@@ -229,7 +312,7 @@ dead_code_const_annotation_complex_scope: {
         var CONST_FOO_ANN = !1;
         var unused_var_2;
         var moo;
-        function bar() {}
+        var bar;
         var beef = 'good';
         var meat = 'beef';
         var pork = 'bad';

test/compress/destructuring.js

@@ -328,5 +328,314 @@ issue_1886: {
         let [a] = [1];
         console.log(a);
     }
-    expect_exact: "1"
+}
+
+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: a = 9,  o: c,  r: l} = e;
+            console.log(n, o, s, a, c, l);
+        }
+        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 n(n) {
+            let t, a, c;
+            let l = n.a || { e: 7, n: 8 };
+            ({t: o,  e,  n: s,  s: t = 9,  o: a,  r: c} = l);
+            console.log(o, e, s, t, a, c);
+        }
+        let o, e, s;
+        n({ a: { t: 1, e: 2, n: 3, s: 4, o: 5, r: 6 } });
+        n({});
+    }
+    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, a, c;
+            let l = o.a || { e: 7, n: 8 };
+            ({t,  e,  n,  s = 9,  o: a,  r: c} = l);
+            console.log(t, e, n, s, a, c);
+        }
+        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: n = 2}, [a = 3, b = 4]) => {
+            console.log(o, n, a, b);
+        })({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);"
 }

test/compress/drop-unused.js

@@ -863,12 +863,12 @@ issue_1583: {
     expect: {
         function m(t) {
             (function(e) {
-                t = (function() {
+                t = e();
+            })(function() {
                 return (function(a) {
                     return a;
                 })(function(a) {});
-                })();
+            });
-            })();
         }
     }
 }
@@ -1253,3 +1253,88 @@ reassign_const: {
     }
     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;
+        var a;
+    }
+}
+
+issue_2105: {
+    options = {
+        collapse_vars: true,
+        inline: true,
+        reduce_vars: true,
+        side_effects: 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: {
+        !void function() {
+            var quux = function() {
+                console.log("PASS");
+            };
+            return {
+                prop: function() {
+                    console.log;
+                    quux();
+                }
+            };
+        }().prop();
+    }
+    expect_stdout: "PASS"
+}

test/compress/evaluate.js

@@ -738,6 +738,7 @@ unsafe_prototype_function: {
 call_args: {
     options = {
         evaluate: true,
+        inline: true,
         reduce_vars: true,
     }
     input: {
@@ -758,6 +759,7 @@ call_args: {
 call_args_drop_param: {
     options = {
         evaluate: true,
+        inline: true,
         keep_fargs: false,
         reduce_vars: true,
         unused: true,
@@ -873,13 +875,15 @@ unsafe_charAt_noop: {
     input: {
         console.log(
             s.charAt(0),
-            "string".charAt(x)
+            "string".charAt(x),
+            (typeof x).charAt()
         );
     }
     expect: {
         console.log(
             s.charAt(0),
-            "string".charAt(x)
+            "string".charAt(x),
+            (typeof x)[0]
         );
     }
 }
@@ -1083,3 +1087,78 @@ Infinity_NaN_undefined_LHS: {
         "}",
     ]
 }
+
+issue_1964_1: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        unsafe_regexp: false,
+        unused: true,
+    }
+    input: {
+        function f() {
+            var long_variable_name = /\s/;
+            return "a b c".split(long_variable_name)[1];
+        }
+        console.log(f());
+    }
+    expect: {
+        function f() {
+            var long_variable_name = /\s/;
+            return "a b c".split(long_variable_name)[1];
+        }
+        console.log(f());
+    }
+    expect_stdout: "b"
+}
+
+issue_1964_2: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        unsafe_regexp: true,
+        unused: true,
+    }
+    input: {
+        function f() {
+            var long_variable_name = /\s/;
+            return "a b c".split(long_variable_name)[1];
+        }
+        console.log(f());
+    }
+    expect: {
+        function f() {
+            return "a b c".split(/\s/)[1];
+        }
+        console.log(f());
+    }
+    expect_stdout: "b"
+}
+
+array_slice_index: {
+    options = {
+        evaluate: true,
+        unsafe: true,
+    }
+    input: {
+        console.log([1,2,3].slice(1)[1]);
+    }
+    expect: {
+        console.log(3);
+    }
+    expect_stdout: "3"
+}
+
+string_charCodeAt: {
+    options = {
+        evaluate: true,
+        unsafe: true,
+    }
+    input: {
+        console.log("foo".charCodeAt("bar".length));
+    }
+    expect: {
+        console.log(NaN);
+    }
+    expect_stdout: "NaN"
+}

test/compress/functions.js

@@ -21,6 +21,7 @@ iifes_returning_constants_keep_fargs_true: {
         join_vars     : true,
         reduce_vars   : true,
         cascade       : true,
+        inline        : true,
     }
     input: {
         (function(){ return -1.23; }());
@@ -56,6 +57,7 @@ iifes_returning_constants_keep_fargs_false: {
         join_vars     : true,
         reduce_vars   : true,
         cascade       : true,
+        inline        : true,
     }
     input: {
         (function(){ return -1.23; }());
@@ -82,6 +84,7 @@ issue_485_crashing_1530: {
         conditionals: true,
         dead_code: true,
         evaluate: true,
+        inline: true,
     }
     input: {
         (function(a) {
@@ -154,6 +157,7 @@ function_returning_constant_literal: {
         evaluate: true,
         cascade: true,
         unused: true,
+        inline: true,
     }
     input: {
         function greeter() {
@@ -167,3 +171,342 @@ function_returning_constant_literal: {
     }
     expect_stdout: "Hello there"
 }
+
+hoist_funs: {
+    options = {
+        hoist_funs: true,
+    }
+    input: {
+        console.log(1, typeof f, typeof g);
+        if (console.log(2, typeof f, typeof g))
+            console.log(3, typeof f, typeof g);
+        else {
+            console.log(4, typeof f, typeof g);
+            function f() {}
+            console.log(5, typeof f, typeof g);
+        }
+        function g() {}
+        console.log(6, typeof f, typeof g);
+    }
+    expect: {
+        function g() {}
+        console.log(1, typeof f, typeof g);
+        if (console.log(2, typeof f, typeof g))
+            console.log(3, typeof f, typeof g);
+        else {
+            console.log(4, typeof f, typeof g);
+            function f() {}
+            console.log(5, typeof f, typeof g);
+        }
+        console.log(6, typeof f, typeof g);
+    }
+    expect_stdout: [
+        "1 'undefined' 'function'",
+        "2 'undefined' 'function'",
+        "4 'function' 'function'",
+        "5 'function' 'function'",
+        "6 'function' 'function'",
+    ]
+    node_version: ">=6"
+}
+
+hoist_funs_strict: {
+    options = {
+        hoist_funs: true,
+    }
+    input: {
+        "use strict";
+        console.log(1, typeof f, typeof g);
+        if (console.log(2, typeof f, typeof g))
+            console.log(3, typeof f, typeof g);
+        else {
+            console.log(4, typeof f, typeof g);
+            function f() {}
+            console.log(5, typeof f, typeof g);
+        }
+        function g() {}
+        console.log(6, typeof f, typeof g);
+    }
+    expect: {
+        "use strict";
+        function g() {}
+        console.log(1, typeof f, typeof g);
+        if (console.log(2, typeof f, typeof g))
+            console.log(3, typeof f, typeof g);
+        else {
+            console.log(4, typeof f, typeof g);
+            function f() {}
+            console.log(5, typeof f, typeof g);
+        }
+        console.log(6, typeof f, typeof g);
+    }
+    expect_stdout: [
+        "1 'undefined' 'function'",
+        "2 'undefined' 'function'",
+        "4 'function' 'function'",
+        "5 'function' 'function'",
+        "6 'undefined' 'function'",
+    ]
+    node_version: ">=4"
+}
+
+issue_203: {
+    options = {
+        keep_fargs: false,
+        side_effects: true,
+        unsafe_Func: true,
+        unused: true,
+    }
+    input: {
+        var m = {};
+        var fn = Function("require", "module", "exports", "module.exports = 42;");
+        fn(null, m, m.exports);
+        console.log(m.exports);
+    }
+    expect: {
+        var m = {};
+        var fn = Function("a", "b", "b.exports=42");
+        fn(null, m, m.exports);
+        console.log(m.exports);
+    }
+    expect_stdout: "42"
+}
+
+no_webkit: {
+    beautify = {
+        webkit: false,
+    }
+    input: {
+        console.log(function() {
+            1 + 1;
+        }.a = 1);
+    }
+    expect_exact: "console.log(function(){1+1}.a=1);"
+    expect_stdout: "1"
+}
+
+webkit: {
+    beautify = {
+        webkit: true,
+    }
+    input: {
+        console.log(function() {
+            1 + 1;
+        }.a = 1);
+    }
+    expect_exact: "console.log((function(){1+1}).a=1);"
+    expect_stdout: "1"
+}
+
+issue_2084: {
+    options = {
+        collapse_vars: true,
+        conditionals: true,
+        evaluate: true,
+        inline: true,
+        passes: 2,
+        reduce_vars: true,
+        sequences: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        var c = 0;
+        !function() {
+            !function(c) {
+                c = 1 + c;
+                var c = 0;
+                function f14(a_1) {
+                    if (c = 1 + c, 0 !== 23..toString())
+                        c = 1 + c, a_1 && (a_1[0] = 0);
+                }
+                f14();
+            }(-1);
+        }();
+        console.log(c);
+    }
+    expect: {
+        var c = 0;
+        !function(c) {
+            c = 1 + c,
+            c = 1 + (c = 0),
+            0 !== 23..toString() && (c = 1 + c);
+        }(-1),
+        console.log(c);
+    }
+    expect_stdout: "0"
+}
+
+issue_2097: {
+    options = {
+        negate_iife: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        function f() {
+            try {
+                throw 0;
+            } catch (e) {
+                console.log(arguments[0]);
+            }
+        }
+        f(1);
+    }
+    expect: {
+        !function() {
+            try {
+                throw 0;
+            } catch (e) {
+                console.log(arguments[0]);
+            }
+        }(1);
+    }
+    expect_stdout: "1"
+}
+
+issue_2101: {
+    options = {
+        inline: true,
+    }
+    input: {
+        a = {};
+        console.log(function() {
+            return function() {
+                return this.a;
+            }();
+        }() === function() {
+            return a;
+        }());
+    }
+    expect: {
+        a = {};
+        console.log(function() {
+            return this.a;
+        }() === a);
+    }
+    expect_stdout: "true"
+}
+
+inner_ref: {
+    options = {
+        inline: true,
+        unused: true,
+    }
+    input: {
+        console.log(function(a) {
+            return function() {
+                return a;
+            }();
+        }(1), function(a) {
+            return function(a) {
+                return a;
+            }();
+        }(2));
+    }
+    expect: {
+        console.log(function(a) {
+            return a;
+        }(1), function(a) {
+            return a;
+        }());
+    }
+    expect_stdout: "1 undefined"
+}
+
+issue_2107: {
+    options = {
+        cascade: true,
+        collapse_vars: true,
+        inline: true,
+        sequences: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        var c = 0;
+        !function() {
+            c++;
+        }(c++ + new function() {
+            this.a = 0;
+            var a = (c = c + 1) + (c = 1 + c);
+            return c++ + a;
+        }());
+        console.log(c);
+    }
+    expect: {
+        var c = 0;
+        c++, new function() {
+            this.a = 0, c = 1 + (c += 1), c++;
+        }(), c++, console.log(c);
+    }
+    expect_stdout: "5"
+}
+
+issue_2114_1: {
+    options = {
+        collapse_vars: true,
+        if_return: true,
+        inline: true,
+        keep_fargs: false,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        var c = 0;
+        !function(a) {
+            a = 0;
+        }([ {
+            0: c = c + 1,
+            length: c = 1 + c
+        }, typeof void function a() {
+            var b = function f1(a) {
+            }(b && (b.b += (c = c + 1, 0)));
+        }() ]);
+        console.log(c);
+    }
+    expect: {
+        var c = 0;
+        !function() {
+            0;
+        }((c += 1, c = 1 + c, function() {
+            var b = void (b && (b.b += (c += 1, 0)));
+        }()));
+        console.log(c);
+    }
+    expect_stdout: "2"
+}
+
+issue_2114_2: {
+    options = {
+        collapse_vars: true,
+        if_return: true,
+        inline: true,
+        keep_fargs: false,
+        passes: 2,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        var c = 0;
+        !function(a) {
+            a = 0;
+        }([ {
+            0: c = c + 1,
+            length: c = 1 + c
+        }, typeof void function a() {
+            var b = function f1(a) {
+            }(b && (b.b += (c = c + 1, 0)));
+        }() ]);
+        console.log(c);
+    }
+    expect: {
+        var c = 0;
+        c = 1 + (c += 1), function() {
+            var b = void (b && (b.b += (c += 1, 0)));
+        }();
+        console.log(c);
+    }
+    expect_stdout: "2"
+}

test/compress/global_defs.js

@@ -160,3 +160,17 @@ issue_1801: {
         console.log(!0);
     }
 }
+
+issue_1986: {
+    options = {
+        global_defs: {
+            "@alert": "console.log",
+        },
+    }
+    input: {
+        alert(42);
+    }
+    expect: {
+        console.log(42);
+    }
+}

test/compress/harmony.js

@@ -241,6 +241,30 @@ export_default_array: {
     expect_exact: "export default[3,foo];"
 }
 
+export_default_anon_function: {
+    options = {
+        evaluate: true,
+    }
+    input: {
+        export default function(){
+            console.log(1 + 2);
+        }
+    }
+    expect_exact: "export default function(){console.log(3)};"
+}
+
+export_default_anon_class: {
+    options = {
+        evaluate: true,
+    }
+    input: {
+        export default class {
+            foo() { console.log(1 + 2); }
+        }
+    }
+    expect_exact: "export default class{foo(){console.log(3)}};"
+}
+
 export_module_statement: {
     input: {
         export * from "a.js";
@@ -509,3 +533,134 @@ issue_1753_disable: {
         }
     }
 }
+
+class_extends: {
+    options = {
+        evaluate: true,
+    }
+    input: {
+        function f() {
+            class foo extends bar {}
+            class pro extends some.prop {}
+            class arr extends stuff[1 - 1] {}
+            class bin extends (a || b) {}
+            class seq extends (a, b) {}
+            class ter extends (a ? b : c) {}
+            class uni extends (!0) {}
+        }
+    }
+    expect_exact: "function f(){class foo extends bar{}class pro extends some.prop{}class arr extends stuff[0]{}class bin extends(a||b){}class seq extends(a,b){}class ter extends(a?b:c){}class uni extends(!0){}}"
+}
+
+class_extends_class: {
+    options = {
+    }
+    input: {
+        class anon extends class {} {}
+        class named extends class base {} {}
+    }
+    expect_exact: "class anon extends class{}{}class named extends class base{}{}"
+}
+
+class_extends_function: {
+    options = {
+    }
+    input: {
+        class anon extends function(){} {}
+        class named extends function base(){} {}
+    }
+    expect_exact: "class anon extends function(){}{}class named extends function base(){}{}"
+}
+
+class_extends_regex: {
+    options = {
+    }
+    input: {
+        function f() {
+            class rx1 extends (/rx/) {}
+            // class rx2 extends /rx/ {}  // FIXME - parse error
+        }
+    }
+    expect_exact: "function f(){class rx1 extends(/rx/){}}"
+}
+
+issue_2028: {
+    options = {
+        side_effects: true,
+    }
+    input: {
+        var a = {};
+        (function(x) {
+            x.X = function() {
+                return X;
+            };
+            class X {
+                static hello() {
+                    console.log("hello");
+                }
+            }
+        }(a));
+        a.X().hello();
+    }
+    expect: {
+        var a = {};
+        (function(x) {
+            x.X = function() {
+                return X;
+            };
+            class X {
+                static hello() {
+                    console.log("hello");
+                }
+            }
+        }(a));
+        a.X().hello();
+    }
+    expect_stdout: "hello"
+    node_version: ">=6"
+}
+
+class_expression_statement: {
+    options = {
+        toplevel: false,
+        side_effects: false,
+        unused: false,
+    }
+    input: {
+        (class {});
+        (class NamedClassExpr {});
+        let expr = (class AnotherClassExpr {});
+        class C {}
+    }
+    expect_exact: "(class{});(class NamedClassExpr{});let expr=class AnotherClassExpr{};class C{}"
+}
+
+class_expression_statement_unused: {
+    options = {
+        toplevel: false,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        (class {});
+        (class NamedClassExpr {});
+        let expr = (class AnotherClassExpr {});
+        class C {}
+    }
+    expect_exact: "let expr=class{};class C{}"
+}
+
+class_expression_statement_unused_toplevel: {
+    options = {
+        toplevel: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        (class {});
+        (class NamedClassExpr {});
+        let expr = (class AnotherClassExpr {});
+        class C {}
+    }
+    expect_exact: ""
+}

test/compress/if_return.js

@@ -302,3 +302,85 @@ issue_1437_conditionals: {
         }
     }
 }
+
+issue_512: {
+    options = {
+        conditionals: true,
+        if_return: true,
+        sequences: true,
+        side_effects: true,
+    }
+    input: {
+        function a() {
+            if (b()) {
+                c();
+                return;
+            }
+            throw e;
+        }
+    }
+    expect: {
+        function a() {
+            if (!b()) throw e;
+            c();
+        }
+    }
+}
+
+issue_1317: {
+    options = {
+        if_return: true,
+    }
+    input: {
+        !function(a) {
+            if (a) return;
+            let b = 1;
+            function g() {
+                return b;
+            }
+            console.log(g());
+        }();
+    }
+    expect: {
+        !function(a) {
+            if (a) return;
+            let b = 1;
+            function g() {
+                return b;
+            }
+            console.log(g());
+        }();
+    }
+    expect_stdout: "1"
+    node_version: ">=6"
+}
+
+issue_1317_strict: {
+    options = {
+        if_return: true,
+    }
+    input: {
+        "use strict";
+        !function(a) {
+            if (a) return;
+            let b = 1;
+            function g() {
+                return b;
+            }
+            console.log(g());
+        }();
+    }
+    expect: {
+        "use strict";
+        !function(a) {
+            if (a) return;
+            let b = 1;
+            function g() {
+                return b;
+            }
+            console.log(g());
+        }();
+    }
+    expect_stdout: "1"
+    node_version: ">=4"
+}

test/compress/issue-1034.js

@@ -116,3 +116,137 @@ non_hoisted_function_after_return_2b: {
         "WARN: Dropping unreachable code [test/compress/issue-1034.js:101,12]",
     ]
 }
+
+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
+    }
+    input: {
+        "use strict";
+        function foo(x) {
+            if (x) {
+                return bar();
+                not_called1();
+            } else {
+                return baz();
+                not_called2();
+            }
+            function bar() { return 7; }
+            return not_reached;
+            function UnusedFunction() {}
+            function baz() { return 8; }
+        }
+        console.log(foo(0), foo(1));
+    }
+    expect: {
+        "use strict";
+        function foo(x) {
+            return x ? bar() : baz();
+            function bar() { return 7 }
+            function baz() { return 8 }
+        }
+        console.log(foo(0), foo(1));
+    }
+    expect_stdout: "8 7"
+    expect_warnings: [
+        'WARN: Dropping unreachable code [test/compress/issue-1034.js:131,16]',
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:134,16]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:137,12]",
+        "WARN: Dropping unused function UnusedFunction [test/compress/issue-1034.js:138,21]"
+    ]
+}
+
+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,
+        collapse_vars: false, passes: 2, warnings: "verbose"
+    }
+    input: {
+        "use strict";
+        function foo(x) {
+            if (x) {
+                return bar(1);
+                var a = not_called(1);
+            } else {
+                return bar(2);
+                var b = not_called(2);
+            }
+            var c = bar(3);
+            function bar(x) { return 7 - x; }
+            function nope() {}
+            return b || c;
+        }
+        console.log(foo(0), foo(1));
+    }
+    expect: {
+        "use strict";
+        function foo(x) {
+            return bar(x ? 1 : 2);
+            function bar(x) {
+                return 7 - x;
+            }
+        }
+        console.log(foo(0), foo(1));
+    }
+    expect_stdout: "5 6"
+    expect_warnings: [
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:173,16]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:173,16]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:176,16]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:176,16]",
+        "WARN: Dropping unused variable a [test/compress/issue-1034.js:173,20]",
+        "WARN: Dropping unused function nope [test/compress/issue-1034.js:180,21]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:178,12]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:178,12]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:181,12]",
+        "WARN: Dropping unused variable b [test/compress/issue-1034.js:176,20]",
+        "WARN: Dropping unused variable c [test/compress/issue-1034.js:178,16]",
+    ]
+}
+
+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,
+        collapse_vars: false
+    }
+    input: {
+        "use strict";
+        function foo(x) {
+            if (x) {
+                return bar(1);
+            } else {
+                return bar(2);
+                var b;
+            }
+            var c = bar(3);
+            function bar(x) {
+                return 7 - x;
+            }
+            return b || c;
+        }
+        console.log(foo(0), foo(1));
+    }
+    expect: {
+        "use strict";
+        function foo(x) {
+            return bar(x ? 1 : 2);
+            function bar(x) { return 7 - x; }
+        }
+        console.log(foo(0), foo(1));
+    }
+    expect_stdout: "5 6"
+    expect_warnings: [
+        // duplicate warnings no longer emitted
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:225,16]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:225,16]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:227,12]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:227,12]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:231,12]",
+    ]
+}

test/compress/issue-1052.js

@@ -1,90 +1,91 @@
 multiple_functions: {
-    options = { if_return: true, hoist_funs: false };
+    options = {
+        hoist_funs: false,
+        if_return: true,
+    }
     input: {
         ( function() {
             if ( !window ) {
                 return;
             }
-
             function f() {}
             function g() {}
         } )();
     }
     expect: {
         ( function() {
-            function f() {}
-            function g() {}
-
             // NOTE: other compression steps will reduce this
             // down to just `window`.
             if ( window );
+            function f() {}
+            function g() {}
         } )();
     }
 }
 
 single_function: {
-    options = { if_return: true, hoist_funs: false };
+    options = {
+        hoist_funs: false,
+        if_return: true,
+    }
     input: {
         ( function() {
             if ( !window ) {
                 return;
             }
-
             function f() {}
         } )();
     }
     expect: {
         ( function() {
-            function f() {}
-
             if ( window );
+            function f() {}
         } )();
     }
 }
 
 deeply_nested: {
-    options = { if_return: true, hoist_funs: false };
+    options = {
+        hoist_funs: false,
+        if_return: true,
+    }
     input: {
         ( function() {
             if ( !window ) {
                 return;
             }
-
             function f() {}
             function g() {}
-
             if ( !document ) {
                 return;
             }
-
             function h() {}
         } )();
     }
     expect: {
         ( function() {
-            function f() {}
-            function g() {}
-
-            function h() {}
-
             // NOTE: other compression steps will reduce this
             // down to just `window`.
             if ( window )
                 if (document);
+            function f() {}
+            function g() {}
+            function h() {}
         } )();
     }
 }
 
 not_hoisted_when_already_nested: {
-    options = { if_return: true, hoist_funs: false };
+    options = {
+        hoist_funs: false,
+        if_return: true,
+    }
     input: {
         ( function() {
             if ( !window ) {
                 return;
             }
-
             if ( foo ) function f() {}
-
         } )();
     }
     expect: {
@@ -94,3 +95,69 @@ not_hoisted_when_already_nested: {
         } )();
     }
 }
+
+defun_if_return: {
+    options = {
+        hoist_funs: false,
+        if_return: true,
+    }
+    input: {
+        function e() {
+            function f() {}
+            if (!window) return;
+            else function g() {}
+            function h() {}
+        }
+    }
+    expect: {
+        function e() {
+            function f() {}
+            if (window) function g() {}
+            function h() {}
+        }
+    }
+}
+
+defun_hoist_funs: {
+    options = {
+        hoist_funs: true,
+        if_return: true,
+    }
+    input: {
+        function e() {
+            function f() {}
+            if (!window) return;
+            else function g() {}
+            function h() {}
+        }
+    }
+    expect: {
+        function e() {
+            function f() {}
+            function h() {}
+            if (window) function g() {}
+        }
+    }
+}
+
+defun_else_if_return: {
+    options = {
+        hoist_funs: false,
+        if_return: true,
+    }
+    input: {
+        function e() {
+            function f() {}
+            if (window) function g() {}
+            else return;
+            function h() {}
+        }
+    }
+    expect: {
+        function e() {
+            function f() {}
+            if (window) function g() {}
+            function h() {}
+        }
+    }
+}

test/compress/issue-1787.js

@@ -1,6 +1,7 @@
 unary_prefix: {
     options = {
         evaluate: true,
+        inline: true,
         reduce_vars: true,
         unused: true,
     }

test/compress/issue-1943.js

@@ -0,0 +1,31 @@
+operator: {
+    input: {
+        a. //comment
+        typeof
+    }
+    expect_exact: "a.typeof;"
+}
+
+name: {
+    input: {
+        a. //comment
+        b
+    }
+    expect_exact: "a.b;"
+}
+
+keyword: {
+    input: {
+        a. //comment
+        default
+    }
+    expect_exact: "a.default;"
+}
+
+atom: {
+    input: {
+        a. //comment
+        true
+    }
+    expect_exact: "a.true;"
+}

test/compress/issue-2001.js

@@ -0,0 +1,281 @@
+export_func_1: {
+    options = {
+        hoist_funs: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        export function f(){};
+    }
+    expect_exact: "export function f(){};"
+}
+
+export_func_2: {
+    options = {
+        hoist_funs: true,
+        side_effects: false,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        export function f(){}(1);
+    }
+    expect_exact: "export function f(){};1;"
+}
+
+export_func_3: {
+    options = {
+        hoist_funs: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        export function f(){}(1);
+    }
+    expect_exact: "export function f(){};"
+}
+
+export_default_func_1: {
+    options = {
+        hoist_funs: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        export default function f(){};
+    }
+    expect_exact: "export default function(){};"
+}
+
+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(){};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(){};"
+}
+
+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{};"
+}
+
+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{};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{};"
+}
+
+export_mangle_1: {
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export function foo(one, two) {
+            return one - two;
+        };
+    }
+    expect_exact: "export function foo(n,o){return n-o};"
+}
+
+export_mangle_2: {
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export default function foo(one, two) {
+            return one - two;
+        };
+    }
+    expect_exact: "export default function n(n,r){return n-r};"
+}
+
+export_mangle_3: {
+    options = {
+        collapse_vars: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export class C {
+            go(one, two) {
+                var z = one;
+                return one - two + z;
+            }
+        };
+    }
+    expect_exact: "export class C{go(n,r){return n-r+n}};"
+}
+
+export_mangle_4: {
+    options = {
+        collapse_vars: true,
+    }
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export default class C {
+            go(one, two) {
+                var z = one;
+                return one - two + z;
+            }
+        };
+    }
+    expect_exact: "export default class n{go(n,r){return n-r+n}};"
+}
+
+export_mangle_5: {
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        export default {
+            prop: function(one, two) {
+                return one - two;
+            }
+        };
+    }
+    expect_exact: "export default{prop:function(n,r){return n-r}};"
+}
+
+export_mangle_6: {
+    mangle = {
+        toplevel: true,
+    }
+    input: {
+        var baz = 2;
+        export let foo = 1, bar = baz;
+    }
+    expect_exact: "var a=2;export let foo=1,bar=a;"
+}
+
+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(){};
+    }
+}
+
+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 {};
+    }
+}
+
+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

@@ -1,7 +1,8 @@
 
 compress_new_function: {
     options = {
-        unsafe: true
+        unsafe: true,
+        unsafe_Func: true,
     }
     input: {
         new Function("aa, bb", 'return aa;');
@@ -14,6 +15,7 @@ compress_new_function: {
 compress_new_function_with_destruct: {
     options = {
         unsafe: true,
+        unsafe_Func: true,
         ecma: 6
     }
     beautify = {
@@ -26,9 +28,7 @@ compress_new_function_with_destruct: {
     }
     expect: {
         Function("a", "[b]", "return a");
-        Function("a", "{bb}", "return a");
+        Function("a", "{bb:b}", "return a");
-        Function("[[a]]", "[{bb}]", 'return a');
+        Function("[[a]]", "[{bb:b}]", 'return a');
     }
 }
-
-

test/compress/issue-281.js

@@ -0,0 +1,483 @@
+collapse_vars_constants: {
+    options = {
+        collapse_vars: true,
+        evaluate: true,
+        inline: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        function f1(x) {
+            var a = 4, b = x.prop, c = 5, d = sideeffect1(), e = sideeffect2();
+            return b + (function() { return d - a * e - c; })();
+        }
+        function f2(x) {
+            var a = 4, b = x.prop, c = 5, not_used = sideeffect1(), e = sideeffect2();
+            return b + (function() { return -a * e - c; })();
+        }
+    }
+    expect: {
+        function f1(x) {
+            var b = x.prop, d = sideeffect1(), e = sideeffect2();
+            return b + (d - 4 * e - 5);
+        }
+        function f2(x) {
+            var b = x.prop;
+            sideeffect1();
+            return b + (-4 * sideeffect2() - 5);
+        }
+    }
+}
+
+modified: {
+    options = {
+        collapse_vars: true,
+        inline: true,
+        unused: true,
+    }
+    input: {
+        function f5(b) {
+            var a = function() {
+                return b;
+            }();
+            return b++ + a;
+        }
+        console.log(f5(1));
+    }
+    expect: {
+        function f5(b) {
+            var a = b;
+            return b++ + a;
+        }
+        console.log(f5(1));
+    }
+    expect_stdout: "2"
+}
+
+ref_scope: {
+    options = {
+        collapse_vars: true,
+        inline: true,
+        unused: true,
+    }
+    input: {
+        console.log(function() {
+            var a = 1, b = 2, c = 3;
+            var a = c++, b = b /= a;
+            return function() {
+                return a;
+            }() + b;
+        }());
+    }
+    expect: {
+        console.log(function() {
+            var a = 1, b = 2, c = 3;
+            b = b /= a = c++;
+            return a + b;
+        }());
+    }
+    expect_stdout: true
+}
+
+safe_undefined: {
+    options = {
+        conditionals: true,
+        if_return: true,
+        inline: true,
+        unsafe: false,
+        unused: true,
+    }
+    mangle = {}
+    input: {
+        var a, c;
+        console.log(function(undefined) {
+            return function() {
+                if (a)
+                    return b;
+                if (c)
+                    return d;
+            };
+        }(1)());
+    }
+    expect: {
+        var a, c;
+        console.log(a ? b : c ? d : void 0);
+    }
+    expect_stdout: true
+}
+
+negate_iife_3: {
+    options = {
+        conditionals: true,
+        expression: true,
+        inline: true,
+        negate_iife: true,
+    }
+    input: {
+        (function(){ return t })() ? console.log(true) : console.log(false);
+    }
+    expect: {
+        t ? console.log(true) : console.log(false);
+    }
+}
+
+negate_iife_3_off: {
+    options = {
+        conditionals: true,
+        expression: true,
+        inline: true,
+        negate_iife: false,
+    }
+    input: {
+        (function(){ return t })() ? console.log(true) : console.log(false);
+    }
+    expect: {
+        t ? console.log(true) : console.log(false);
+    }
+}
+
+negate_iife_4: {
+    options = {
+        conditionals: true,
+        expression: true,
+        inline: true,
+        negate_iife: true,
+        sequences: true,
+    }
+    input: {
+        (function(){ return t })() ? console.log(true) : console.log(false);
+        (function(){
+            console.log("something");
+        })();
+    }
+    expect: {
+        t ? console.log(true) : console.log(false), void console.log("something");
+    }
+}
+
+negate_iife_5: {
+    options = {
+        conditionals: true,
+        expression: true,
+        inline: true,
+        negate_iife: true,
+        sequences: true,
+    }
+    input: {
+        if ((function(){ return t })()) {
+            foo(true);
+        } else {
+            bar(false);
+        }
+        (function(){
+            console.log("something");
+        })();
+    }
+    expect: {
+        t ? foo(true) : bar(false), void console.log("something");
+    }
+}
+
+negate_iife_5_off: {
+    options = {
+        conditionals: true,
+        expression: true,
+        inline: true,
+        negate_iife: false,
+        sequences: true,
+    };
+    input: {
+        if ((function(){ return t })()) {
+            foo(true);
+        } else {
+            bar(false);
+        }
+        (function(){
+            console.log("something");
+        })();
+    }
+    expect: {
+        t ? foo(true) : bar(false), void console.log("something");
+    }
+}
+
+issue_1254_negate_iife_true: {
+    options = {
+        expression: true,
+        inline: true,
+        negate_iife: true,
+    }
+    input: {
+        (function() {
+            return function() {
+                console.log('test')
+            };
+        })()();
+    }
+    expect_exact: 'void console.log("test");'
+    expect_stdout: true
+}
+
+issue_1254_negate_iife_nested: {
+    options = {
+        expression: true,
+        inline: true,
+        negate_iife: true,
+    }
+    input: {
+        (function() {
+            return function() {
+                console.log('test')
+            };
+        })()()()()();
+    }
+    expect_exact: '(void console.log("test"))()()();'
+}
+
+negate_iife_issue_1073: {
+    options = {
+        conditionals: true,
+        evaluate: true,
+        inline: true,
+        negate_iife: true,
+        reduce_vars: true,
+        sequences: true,
+        unused: true,
+    };
+    input: {
+        new (function(a) {
+            return function Foo() {
+                this.x = a;
+                console.log(this);
+            };
+        }(7))();
+    }
+    expect: {
+        new function() {
+            this.x = 7,
+            console.log(this);
+        }();
+    }
+    expect_stdout: true
+}
+
+issue_1288_side_effects: {
+    options = {
+        conditionals: true,
+        evaluate: true,
+        inline: true,
+        negate_iife: true,
+        reduce_vars: true,
+        side_effects: true,
+        unused: true,
+    };
+    input: {
+        if (w) ;
+        else {
+            (function f() {})();
+        }
+        if (!x) {
+            (function() {
+                x = {};
+            })();
+        }
+        if (y)
+            (function() {})();
+        else
+            (function(z) {
+                return z;
+            })(0);
+    }
+    expect: {
+        w;
+        x || (x = {});
+        y;
+    }
+}
+
+inner_var_for_in_1: {
+    options = {
+        evaluate: true,
+        inline: true,
+        reduce_vars: true,
+    }
+    input: {
+        function f() {
+            var a = 1, b = 2;
+            for (b in (function() {
+                return x(a, b, c);
+            })()) {
+                var c = 3, d = 4;
+                x(a, b, c, d);
+            }
+            x(a, b, c, d);
+        }
+    }
+    expect: {
+        function f() {
+            var a = 1, b = 2;
+            for (b in x(1, b, c)) {
+                var c = 3, d = 4;
+                x(1, b, c, d);
+            }
+            x(1, b, c, d);
+        }
+    }
+}
+
+issue_1595_3: {
+    options = {
+        evaluate: true,
+        inline: true,
+        passes: 2,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function f(a) {
+            return g(a + 1);
+        })(2);
+    }
+    expect: {
+        g(3);
+    }
+}
+
+issue_1758: {
+    options = {
+        inline: true,
+        sequences: true,
+        side_effects: true,
+    }
+    input: {
+        console.log(function(c) {
+            var undefined = 42;
+            return function() {
+                c--;
+                c--, c.toString();
+                return;
+            }();
+        }());
+    }
+    expect: {
+        console.log(function(c) {
+            var undefined = 42;
+            return c--, c--, void c.toString();
+        }());
+    }
+    expect_stdout: "undefined"
+}
+wrap_iife: {
+    options = {
+        inline: true,
+        negate_iife: false,
+    }
+    beautify = {
+        wrap_iife: true,
+    }
+    input: {
+        (function() {
+            return function() {
+                console.log('test')
+            };
+        })()();
+    }
+    expect_exact: 'void console.log("test");'
+}
+
+wrap_iife_in_expression: {
+    options = {
+        inline: true,
+        negate_iife: false,
+    }
+    beautify = {
+        wrap_iife: true,
+    }
+    input: {
+        foo = (function () {
+            return bar();
+        })();
+    }
+    expect_exact: 'foo=bar();'
+}
+
+wrap_iife_in_return_call: {
+    options = {
+        inline: true,
+        negate_iife: false,
+    }
+    beautify = {
+        wrap_iife: true,
+    }
+    input: {
+        (function() {
+            return (function() {
+                console.log('test')
+            })();
+        })()();
+    }
+    expect_exact: '(void console.log("test"))();'
+}
+
+pure_annotation: {
+    options = {
+        inline: true,
+        side_effects: true,
+    }
+    input: {
+        /*@__PURE__*/(function() {
+            console.log("hello");
+        }());
+    }
+    expect_exact: ""
+}
+
+drop_fargs: {
+    options = {
+        cascade: true,
+        inline: true,
+        keep_fargs: false,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        var a = 1;
+        !function(a_1) {
+            a++;
+        }(a++ + (a && a.var));
+        console.log(a);
+    }
+    expect: {
+        var a = 1;
+        !function() {
+            a++;
+        }(++a && a.var);
+        console.log(a);
+    }
+    expect_stdout: "3"
+}
+
+keep_fargs: {
+    options = {
+        cascade: true,
+        inline: true,
+        keep_fargs: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        var a = 1;
+        !function(a_1) {
+            a++;
+        }(a++ + (a && a.var));
+        console.log(a);
+    }
+    expect: {
+        var a = 1;
+        !function(a_1) {
+            a++;
+        }(++a && a.var);
+        console.log(a);
+    }
+    expect_stdout: "3"
+}

test/compress/negate-iife.js

@@ -22,7 +22,8 @@ negate_iife_1_off: {
 
 negate_iife_2: {
     options = {
-        negate_iife: true
+        inline: true,
+        negate_iife: true,
     };
     input: {
         (function(){ return {} })().x = 10;
@@ -32,6 +33,7 @@ negate_iife_2: {
 
 negate_iife_2_side_effects: {
     options = {
+        inline: true,
         negate_iife: true,
         side_effects: true,
     }
@@ -58,6 +60,7 @@ negate_iife_3_evaluate: {
     options = {
         conditionals: true,
         evaluate: true,
+        inline: true,
         negate_iife: true,
     }
     input: {
@@ -100,6 +103,7 @@ negate_iife_3_off_evaluate: {
     options = {
         conditionals: true,
         evaluate: true,
+        inline: true,
         negate_iife: false,
     }
     input: {

test/compress/node_version.js

@@ -0,0 +1,38 @@
+eval_let_6: {
+    input: {
+        eval("let a;");
+        console.log();
+    }
+    expect: {
+        eval("let a;");
+        console.log();
+    }
+    expect_stdout: ""
+    node_version: ">=6"
+}
+
+eval_let_4: {
+    input: {
+        eval("let a;");
+        console.log();
+    }
+    expect: {
+        eval("let a;");
+        console.log();
+    }
+    expect_stdout: SyntaxError("Block-scoped declarations (let, const, function, class) not yet supported outside strict mode")
+    node_version: "4"
+}
+
+eval_let_0: {
+    input: {
+        eval("let a;");
+        console.log();
+    }
+    expect: {
+        eval("let a;");
+        console.log();
+    }
+    expect_stdout: SyntaxError("Unexpected identifier")
+    node_version: "<=0.12"
+}

test/compress/properties.js

@@ -557,3 +557,105 @@ native_prototype: {
         "".indexOf.call(e, "bar");
     }
 }
+
+accessor_boolean: {
+    input: {
+        var a = 1;
+        var b = {
+            get true() {
+                return a;
+            },
+            set false(c) {
+                a = c;
+            }
+        };
+        console.log(b.true, b.false = 2, b.true);
+    }
+    expect_exact: 'var a=1;var b={get true(){return a},set false(c){a=c}};console.log(b.true,b.false=2,b.true);'
+    expect_stdout: "1 2 2"
+}
+
+accessor_get_set: {
+    input: {
+        var a = 1;
+        var b = {
+            get set() {
+                return a;
+            },
+            set get(c) {
+                a = c;
+            }
+        };
+        console.log(b.set, b.get = 2, b.set);
+    }
+    expect_exact: 'var a=1;var b={get set(){return a},set get(c){a=c}};console.log(b.set,b.get=2,b.set);'
+    expect_stdout: "1 2 2"
+}
+
+accessor_null_undefined: {
+    input: {
+        var a = 1;
+        var b = {
+            get null() {
+                return a;
+            },
+            set undefined(c) {
+                a = c;
+            }
+        };
+        console.log(b.null, b.undefined = 2, b.null);
+    }
+    expect_exact: 'var a=1;var b={get null(){return a},set undefined(c){a=c}};console.log(b.null,b.undefined=2,b.null);'
+    expect_stdout: "1 2 2"
+}
+
+accessor_number: {
+    input: {
+        var a = 1;
+        var b = {
+            get 42() {
+                return a;
+            },
+            set 42(c) {
+                a = c;
+            }
+        };
+        console.log(b[42], b[42] = 2, b[42]);
+    }
+    expect_exact: 'var a=1;var b={get 42(){return a},set 42(c){a=c}};console.log(b[42],b[42]=2,b[42]);'
+    expect_stdout: "1 2 2"
+}
+
+accessor_string: {
+    input: {
+        var a = 1;
+        var b = {
+            get "a-b"() {
+                return a;
+            },
+            set "a-b"(c) {
+                a = c;
+            }
+        };
+        console.log(b["a-b"], b["a-b"] = 2, b["a-b"]);
+    }
+    expect_exact: 'var a=1;var b={get"a-b"(){return a},set"a-b"(c){a=c}};console.log(b["a-b"],b["a-b"]=2,b["a-b"]);'
+    expect_stdout: "1 2 2"
+}
+
+accessor_this: {
+    input: {
+        var a = 1;
+        var b = {
+            get this() {
+                return a;
+            },
+            set this(c) {
+                a = c;
+            }
+        };
+        console.log(b.this, b.this = 2, b.this);
+    }
+    expect_exact: 'var a=1;var b={get this(){return a},set this(c){a=c}};console.log(b.this,b.this=2,b.this);'
+    expect_stdout: "1 2 2"
+}

test/compress/pure_getters.js

@@ -178,3 +178,66 @@ impure_getter_2: {
     }
     expect: {}
 }
+
+issue_2110_1: {
+    options = {
+        cascade: true,
+        pure_getters: "strict",
+        sequences: true,
+        side_effects: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        function f() {
+            function f() {}
+            function g() {
+                return this;
+            }
+            f.g = g;
+            return f.g();
+        }
+        console.log(typeof f());
+    }
+    expect: {
+        function f() {
+            function f() {}
+            return f.g = function() {
+                return this;
+            }, f.g();
+        }
+        console.log(typeof f());
+    }
+    expect_stdout: "function"
+}
+
+issue_2110_2: {
+    options = {
+        collapse_vars: true,
+        pure_getters: "strict",
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        function f() {
+            function f() {}
+            function g() {
+                return this;
+            }
+            f.g = g;
+            return f.g();
+        }
+        console.log(typeof f());
+    }
+    expect: {
+        function f() {
+            function f() {}
+            f.g = function() {
+                return this;
+            };
+            return f.g();
+        }
+        console.log(typeof f());
+    }
+    expect_stdout: "function"
+}

test/compress/reduce_vars.js

@@ -2,6 +2,7 @@ reduce_vars: {
     options = {
         conditionals  : true,
         evaluate      : true,
+        inline        : true,
         global_defs   : {
             C : 0
         },
@@ -1032,6 +1033,7 @@ defun_inline_2: {
 defun_inline_3: {
     options = {
         evaluate: true,
+        inline: true,
         passes: 2,
         reduce_vars: true,
         side_effects: true,
@@ -1054,6 +1056,7 @@ defun_inline_3: {
 
 defun_call: {
     options = {
+        inline: true,
         reduce_vars: true,
         unused: true,
     }
@@ -1080,6 +1083,7 @@ defun_call: {
 
 defun_redefine: {
     options = {
+        inline: true,
         reduce_vars: true,
         unused: true,
     }
@@ -1112,6 +1116,7 @@ defun_redefine: {
 
 func_inline: {
     options = {
+        inline: true,
         reduce_vars: true,
         unused: true,
     }
@@ -1138,6 +1143,7 @@ func_inline: {
 
 func_modified: {
     options = {
+        inline: true,
         reduce_vars: true,
         unused: true,
     }
@@ -1311,19 +1317,47 @@ iife_func_side_effects: {
         unused: true,
     }
     input: {
+        function x() {
+            console.log("x");
+        }
+        function y() {
+            console.log("y");
+        }
+        function z() {
+            console.log("z");
+        }
         (function(a, b, c) {
-            return b();
+            function y() {
+                console.log("FAIL");
+            }
+            return y + b();
         })(x(), function() {
             return y();
         }, z());
     }
     expect: {
+        function x() {
+            console.log("x");
+        }
+        function y() {
+            console.log("y");
+        }
+        function z() {
+            console.log("z");
+        }
         (function(a, b, c) {
             return function() {
+                console.log("FAIL");
+            } + b();
+        })(x(), function() {
             return y();
-            }();
+        }, z());
-        })(x(), 0, z());
     }
+    expect_stdout: [
+        "x",
+        "z",
+        "y",
+    ]
 }
 
 issue_1595_1: {
@@ -1687,6 +1721,7 @@ redefine_arguments_1: {
 redefine_arguments_2: {
     options = {
         evaluate: true,
+        inline: true,
         keep_fargs: false,
         reduce_vars: true,
         side_effects: true,
@@ -1723,6 +1758,7 @@ redefine_arguments_2: {
 redefine_arguments_3: {
     options = {
         evaluate: true,
+        inline: true,
         keep_fargs: false,
         passes: 3,
         reduce_vars: true,
@@ -1799,6 +1835,7 @@ redefine_farg_1: {
 redefine_farg_2: {
     options = {
         evaluate: true,
+        inline: true,
         keep_fargs: false,
         reduce_vars: true,
         side_effects: true,
@@ -1835,6 +1872,7 @@ redefine_farg_2: {
 redefine_farg_3: {
     options = {
         evaluate: true,
+        inline: true,
         keep_fargs: false,
         passes: 3,
         reduce_vars: true,
@@ -2537,3 +2575,53 @@ accessor: {
     }
     expect_stdout: "1 1"
 }
+
+issue_2090_1: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+    }
+    input: {
+        console.log(function() {
+            var x = 1;
+            [].forEach(() => x = 2);
+            return x;
+        }());
+    }
+    expect: {
+        console.log(function() {
+            var x = 1;
+            [].forEach(() => x = 2);
+            return x;
+        }());
+    }
+    expect_stdout: "1"
+    node_version: ">=4"
+}
+
+issue_2090_2: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+    }
+    input: {
+        console.log(function() {
+            var x = 1;
+            [].forEach(() => {
+                x = 2;
+            });
+            return x;
+        }());
+    }
+    expect: {
+        console.log(function() {
+            var x = 1;
+            [].forEach(() => {
+                x = 2;
+            });
+            return x;
+        }());
+    }
+    expect_stdout: "1"
+    node_version: ">=4"
+}

test/compress/sandbox.js

@@ -0,0 +1,14 @@
+console_log: {
+    input: {
+        console.log("%% %s");
+        console.log("%% %s", "%s");
+    }
+    expect: {
+        console.log("%% %s");
+        console.log("%% %s", "%s");
+    }
+    expect_stdout: [
+        "%% %s",
+        "% %s",
+    ]
+}

test/compress/sequences.js

@@ -734,3 +734,23 @@ reassign_const: {
     }
     expect_stdout: true
 }
+
+issue_2062: {
+    options = {
+        booleans: true,
+        cascade: true,
+        conditionals: true,
+        side_effects: true,
+    }
+    input: {
+        var a = 1;
+        if ([ a || a++ + a--, a++ + a--, a && a.var ]);
+        console.log(a);
+    }
+    expect: {
+        var a = 1;
+        a || (a++, a--), a++, --a && a.var;
+        console.log(a);
+    }
+    expect_stdout: "1"
+}

test/compress/string-literal.js

@@ -8,3 +8,12 @@ octal_escape_sequence: {
         var border_check = "\x20\x30\x38\x30\x00\x30\xc0\x30";
     }
 }
+
+issue_1929: {
+    input: {
+        function f(s) {
+            return s.split(/[\\/]/);
+        }
+    }
+    expect_exact: "function f(s){return s.split(/[\\\\/]/)}"
+}

test/compress/yield.js

@@ -190,3 +190,12 @@ yield_sub: {
     }
     expect_exact: 'function*foo(){yield x["foo"];(yield x)["foo"];yield(yield obj.foo())["bar"]()}'
 }
+
+yield_as_ES5_property: {
+    input: {
+        "use strict";
+        console.log({yield: 42}.yield);
+    }
+    expect_exact: '"use strict";console.log({yield:42}.yield);'
+    expect_stdout: "42"
+}

test/fetch.js

@@ -0,0 +1,31 @@
+var fs = require("fs");
+var path = require("path");
+
+try {
+    fs.mkdirSync("./tmp");
+} catch (e) {
+    if (e.code != "EEXIST") throw e;
+}
+
+function local(url) {
+    return path.join("./tmp", encodeURIComponent(url));
+}
+
+function read(url) {
+    return fs.createReadStream(local(url));
+}
+
+module.exports = function(url, callback) {
+    var result = read(url);
+    result.on("error", function(e) {
+        if (e.code != "ENOENT") return callback(e);
+        require(url.slice(0, url.indexOf(":"))).get(url, function(res) {
+            if (res.statusCode !== 200) return callback(res);
+            res.pipe(fs.createWriteStream(local(url)).on("close", function() {
+                callback(null, read(url));
+            }));
+        });
+    }).on("open", function() {
+        callback(null, result);
+    });
+};

test/input/invalid/else.js

@@ -0,0 +1 @@
+if (0) else 1;

test/input/invalid/return.js

@@ -0,0 +1 @@
+return 42;

test/input/issue-2082/sample.js

@@ -0,0 +1 @@
+console.log(x);

test/input/issue-2082/sample.js.map

@@ -0,0 +1 @@
+{"version": 3,"sources": ["index.js"],"mappings": ";"}

test/input/issue-505/input.js

@@ -0,0 +1,5 @@
+function test(callback) {
+    'aaaaaaaaaaaaaaaa';
+    callback(err, data);
+    callback(err, data);
+}

test/input/issue-505/output.js

@@ -0,0 +1,5 @@
+function test(a){
+"aaaaaaaaaaaaaaaa"
+;a(err,data),a(err,data)
+}
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbIjAiXSwibmFtZXMiOlsidGVzdCIsImNhbGxiYWNrIiwiZXJyIiwiZGF0YSJdLCJtYXBwaW5ncyI6IkFBQUEsU0FBU0EsS0FBS0M7QUFDVjtDQUNBQSxFQUFTQyxJQUFLQyxNQUNkRixFQUFTQyxJQUFLQyJ9

test/input/issue-520/output.js

@@ -1,2 +1,2 @@
 new function(){console.log(3)};
-//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInN0ZGluIl0sIm5hbWVzIjpbImNvbnNvbGUiLCJsb2ciXSwibWFwcGluZ3MiOiJBQUErQyxHQUFyQyxZQUFnQkEsUUFBUUMsSUFBSSIsInNvdXJjZXNDb250ZW50IjpbImNsYXNzIEZvbyB7IGNvbnN0cnVjdG9yKCl7Y29uc29sZS5sb2coMSsyKTt9IH0gbmV3IEZvbygpO1xuIl19
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInN0ZGluIl0sIm5hbWVzIjpbImNvbnNvbGUiLCJsb2ciXSwibWFwcGluZ3MiOiJBQUErQyxJQUFyQyxXQUFnQkEsUUFBUUMsSUFBSSIsInNvdXJjZXNDb250ZW50IjpbImNsYXNzIEZvbyB7IGNvbnN0cnVjdG9yKCl7Y29uc29sZS5sb2coMSsyKTt9IH0gbmV3IEZvbygpO1xuIl19

test/jetstream.js

@@ -3,7 +3,7 @@
 
 "use strict";
 
-var site = "http://browserbench.org/JetStream/";
+var site = "http://browserbench.org/JetStream";
 if (typeof phantom == "undefined") {
     // workaround for tty output truncation upon process.exit()
     [process.stdout, process.stderr].forEach(function(stream){
@@ -11,25 +11,38 @@ if (typeof phantom == "undefined") {
             stream._handle.setBlocking(true);
     });
     var args = process.argv.slice(2);
+    var debug = args.indexOf("--debug");
+    if (debug >= 0) {
+        args.splice(debug, 1);
+        debug = true;
+    } else {
+        debug = false;
+    }
     if (!args.length) {
-        args.push("-mc");
+        args.push("-mcb", "beautify=false,webkit");
     }
-    args.push("--stats");
+    args.push("--timings");
     var child_process = require("child_process");
-    try {
+    var fetch = require("./fetch");
-        require("phantomjs-prebuilt");
-    } catch(e) {
-        child_process.execSync("npm install phantomjs-prebuilt@2.1.14");
-    }
     var http = require("http");
     var server = http.createServer(function(request, response) {
         request.resume();
-        var url = decodeURIComponent(request.url.slice(1));
+        var url = site + request.url;
+        fetch(url, function(err, res) {
+            if (err) throw err;
+            response.writeHead(200, {
+                "Content-Type": {
+                    css: "text/css",
+                    js: "application/javascript",
+                    png: "image/png"
+                }[url.slice(url.lastIndexOf(".") + 1)] || "text/html; charset=utf-8"
+            });
+            if (/\.js$/.test(url)) {
                 var stderr = "";
                 var uglifyjs = child_process.fork("bin/uglifyjs", args, {
                     silent: true
                 }).on("exit", function(code) {
-            console.log("uglifyjs", url.indexOf(site) == 0 ? url.slice(site.length) : url, args.join(" "));
+                    console.log("uglifyjs", url.slice(site.length + 1), args.join(" "));
                     console.log(stderr);
                     if (code) throw new Error("uglifyjs failed with code " + code);
                 });
@@ -37,20 +50,31 @@ if (typeof phantom == "undefined") {
                     stderr += data;
                 }).setEncoding("utf8");
                 uglifyjs.stdout.pipe(response);
-        http.get(url, function(res) {
                 res.pipe(uglifyjs.stdin);
+            } else {
+                res.pipe(response);
+            }
         });
-    }).listen().on("listening", function() {
+    }).listen();
-        var phantomjs = require("phantomjs-prebuilt");
+    server.on("listening", function() {
-        var program = phantomjs.exec(process.argv[1], server.address().port);
+        var port = server.address().port;
+        if (debug) {
+            console.log("http://localhost:" + port + "/");
+        } else {
+            child_process.exec("npm install phantomjs-prebuilt@2.1.14 --no-save", function(error) {
+                if (error) throw error;
+                var program = require("phantomjs-prebuilt").exec(process.argv[1], port);
                 program.stdout.pipe(process.stdout);
                 program.stderr.pipe(process.stderr);
                 program.on("exit", function(code) {
                     server.close();
                     if (code) throw new Error("JetStream failed!");
                     console.log("JetStream completed successfully.");
+                    process.exit(0);
                 });
             });
+        }
+    });
     server.timeout = 0;
 } else {
     var page = require("webpage").create();
@@ -63,10 +87,6 @@ if (typeof phantom == "undefined") {
         phantom.exit(1);
     };
     var url = "http://localhost:" + require("system").args[1] + "/";
-    page.onResourceRequested = function(requestData, networkRequest) {
-        if (/\.js$/.test(requestData.url))
-            networkRequest.changeUrl(url + encodeURIComponent(requestData.url));
-    }
     page.onConsoleMessage = function(msg) {
         if (/Error:/i.test(msg)) {
             console.error(msg);
@@ -77,8 +97,8 @@ if (typeof phantom == "undefined") {
             phantom.exit();
         }
     };
-    page.open(site, function(status) {
+    page.open(url, function(status) {
-        if (status != "success") phantomjs.exit(1);
+        if (status != "success") phantom.exit(1);
         page.evaluate(function() {
             JetStream.switchToQuick();
             JetStream.start();

test/mocha/cli.js

@@ -9,7 +9,7 @@ function read(path) {
 describe("bin/uglifyjs", function () {
     var uglifyjscmd = '"' + process.argv[0] + '" bin/uglifyjs';
     it("should produce a functional build when using --self", function (done) {
-        this.timeout(15000);
+        this.timeout(30000);
 
         var command = uglifyjscmd + ' --self -cm --wrap WrappedUglifyJS';
 
@@ -19,7 +19,9 @@ describe("bin/uglifyjs", function () {
             eval(stdout);
 
             assert.strictEqual(typeof WrappedUglifyJS, 'object');
-            assert.strictEqual(WrappedUglifyJS.minify("foo([true,,2+3]);").code, "foo([!0,,5]);");
+            var result = WrappedUglifyJS.minify("foo([true,,2+3]);");
+            assert.strictEqual(result.error, undefined);
+            assert.strictEqual(result.code, "foo([!0,,5]);");
 
             done();
         });
@@ -61,7 +63,7 @@ describe("bin/uglifyjs", function () {
             if (err) throw err;
 
             assert.strictEqual(stdout, "var bar=function(){function foo(bar){return bar}return foo}();\n" +
-               "//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInRlc3QvaW5wdXQvaXNzdWUtMTMyMy9zYW1wbGUuanMiXSwibmFtZXMiOlsiYmFyIiwiZm9vIl0sIm1hcHBpbmdzIjoiQUFBQSxHQUFJQSxLQUFNLFdBQ04sUUFBU0MsS0FBS0QsS0FDVixNQUFPQSxLQUdYLE1BQU9DIn0=\n");
+                "//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInRlc3QvaW5wdXQvaXNzdWUtMTMyMy9zYW1wbGUuanMiXSwibmFtZXMiOlsiYmFyIiwiZm9vIl0sIm1hcHBpbmdzIjoiQUFBQSxJQUFJQSxJQUFNLFdBQ04sU0FBU0MsSUFBS0QsS0FDVixPQUFPQSxJQUdYLE9BQU9DIn0=\n");
             done();
         });
     });
@@ -75,6 +77,23 @@ describe("bin/uglifyjs", function () {
             done();
         });
     });
+    it("should not consider source map file content as source map file name (issue #2082)", function (done) {
+        var command = [
+            uglifyjscmd,
+            "test/input/issue-2082/sample.js",
+            "--source-map", "content=test/input/issue-2082/sample.js.map",
+            "--source-map", "url=inline",
+        ].join(" ");
+
+        exec(command, function (err, stdout, stderr) {
+            if (err) throw err;
+
+            var stderrLines = stderr.split('\n');
+            assert.strictEqual(stderrLines[0], 'INFO: Using input source map: test/input/issue-2082/sample.js.map');
+            assert.notStrictEqual(stderrLines[1], 'INFO: Using input source map: {"version": 3,"sources": ["index.js"],"mappings": ";"}');
+            done();
+        });
+    });
     it("Should work with --keep-fnames (mangle only)", function (done) {
         var command = uglifyjscmd + ' test/input/issue-1431/sample.js --keep-fnames -m';
 
@@ -173,7 +192,7 @@ describe("bin/uglifyjs", function () {
 
             assert.strictEqual(stdout, [
                 "var bar=function(){function foo(bar){return bar}return foo}();",
-                "//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInRlc3QvaW5wdXQvaXNzdWUtMTMyMy9zYW1wbGUuanMiXSwibmFtZXMiOlsiYmFyIiwiZm9vIl0sIm1hcHBpbmdzIjoiQUFBQSxHQUFJQSxLQUFNLFdBQ04sUUFBU0MsS0FBS0QsS0FDVixNQUFPQSxLQUdYLE1BQU9DIn0=",
+                "//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInRlc3QvaW5wdXQvaXNzdWUtMTMyMy9zYW1wbGUuanMiXSwibmFtZXMiOlsiYmFyIiwiZm9vIl0sIm1hcHBpbmdzIjoiQUFBQSxJQUFJQSxJQUFNLFdBQ04sU0FBU0MsSUFBS0QsS0FDVixPQUFPQSxJQUdYLE9BQU9DIn0=",
                 "",
             ].join("\n"));
             assert.strictEqual(stderr, "WARN: inline source map not found\n");
@@ -484,6 +503,36 @@ describe("bin/uglifyjs", function () {
             done();
         });
     });
+    it("Should throw syntax error (else)", function(done) {
+        var command = uglifyjscmd + ' test/input/invalid/else.js';
+
+        exec(command, function (err, stdout, stderr) {
+            assert.ok(err);
+            assert.strictEqual(stdout, "");
+            assert.strictEqual(stderr.split(/\n/).slice(0, 4).join("\n"), [
+                "Parse error at test/input/invalid/else.js:1,7",
+                "if (0) else 1;",
+                "       ^",
+                "ERROR: Unexpected token: keyword (else)"
+            ].join("\n"));
+            done();
+        });
+    });
+    it("Should throw syntax error (return)", function(done) {
+        var command = uglifyjscmd + ' test/input/invalid/return.js';
+
+        exec(command, function (err, stdout, stderr) {
+            assert.ok(err);
+            assert.strictEqual(stdout, "");
+            assert.strictEqual(stderr.split(/\n/).slice(0, 4).join("\n"), [
+                "Parse error at test/input/invalid/return.js:1,0",
+                "return 42;",
+                "^",
+                "ERROR: 'return' outside of function"
+            ].join("\n"));
+            done();
+        });
+    });
     it("Should handle literal string as source map input", function(done) {
         var command = [
             uglifyjscmd,
@@ -497,7 +546,7 @@ describe("bin/uglifyjs", function () {
 
             assert.strictEqual(stdout, [
                 '"use strict";var foo=function foo(x){return"foo "+x};console.log(foo("bar"));',
-                "//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbImluZGV4LmpzIl0sIm5hbWVzIjpbImZvbyIsIngiLCJjb25zb2xlIiwibG9nIl0sIm1hcHBpbmdzIjoiWUFBQSxJQUFJQSxLQUFNLFFBQU5BLEtBQU1DLEdBQUEsTUFBSyxPQUFTQSxFQUN4QkMsU0FBUUMsSUFBSUgsSUFBSSJ9",
+                "//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbImluZGV4LmpzIl0sIm5hbWVzIjpbImZvbyIsIngiLCJjb25zb2xlIiwibG9nIl0sIm1hcHBpbmdzIjoiYUFBQSxJQUFJQSxJQUFNLFNBQU5BLElBQU1DLEdBQUEsTUFBSyxPQUFTQSxHQUN4QkMsUUFBUUMsSUFBSUgsSUFBSSJ9",
                 ""
             ].join("\n"));
             done();
@@ -520,4 +569,33 @@ describe("bin/uglifyjs", function () {
             done();
         });
     });
+    it("Should print supported options on invalid option syntax", function(done) {
+        var command = uglifyjscmd + " test/input/comments/filter.js -b ascii-only";
+        exec(command, function (err, stdout, stderr) {
+            assert.ok(err);
+            assert.strictEqual(stdout, "");
+            assert.ok(/^Supported options:\n[\s\S]*?\nERROR: `ascii-only` is not a supported option/.test(stderr), stderr);
+            done();
+        });
+    });
+    it("Should work with --mangle reserved=[]", function (done) {
+        var command = uglifyjscmd + ' test/input/issue-505/input.js -m reserved=[callback]';
+
+        exec(command, function (err, stdout) {
+            if (err) throw err;
+
+            assert.strictEqual(stdout, 'function test(callback){"aaaaaaaaaaaaaaaa";callback(err,data);callback(err,data)}\n');
+            done();
+        });
+    });
+    it("Should work with --mangle reserved=false", function (done) {
+        var command = uglifyjscmd + ' test/input/issue-505/input.js -m reserved=false';
+
+        exec(command, function (err, stdout) {
+            if (err) throw err;
+
+            assert.strictEqual(stdout, 'function test(a){"aaaaaaaaaaaaaaaa";a(err,data);a(err,data)}\n');
+            done();
+        });
+    });
 });

test/mocha/glob.js

@@ -31,7 +31,7 @@ describe("bin/uglifyjs with input file globs", function() {
         exec(command, function(err, stdout) {
             if (err) throw err;
 
-            assert.strictEqual(stdout, 'var print=console.log.bind(console),a=function(n){return 3*n}(3),b=function(n){return n/2}(12);print("qux",a,b),function(n){print("Foo:",2*n)}(11);\n');
+            assert.strictEqual(stdout, 'var print=console.log.bind(console);print("qux",9,6),print("Foo:",2*11);\n');
             done();
         });
     });

test/mocha/minify.js

@@ -13,6 +13,13 @@ describe("minify", function() {
         assert.strictEqual(result.code, 'function foo(n){return n?3:7}');
     });
 
+    it("Should skip inherited keys from `files`", function() {
+        var files = Object.create({ skip: this });
+        files[0] = "alert(1 + 1)";
+        var result = Uglify.minify(files);
+        assert.strictEqual(result.code, "alert(2);");
+    });
+
     describe("keep_quoted_props", function() {
         it("Should preserve quotes in object literals", function() {
             var js = 'var foo = {"x": 1, y: 2, \'z\': 3};';
@@ -106,7 +113,7 @@ describe("minify", function() {
                         content: "inline"
                     }
                 });
-                assert.strictEqual(result.code, "var bar=function(){function foo(bar){return bar}return foo}();");
+                assert.strictEqual(result.code, "var bar=function(){return function(bar){return bar}}();");
                 assert.strictEqual(warnings.length, 1);
                 assert.strictEqual(warnings[0], "inline source map not found");
             } finally {
@@ -138,13 +145,25 @@ describe("minify", function() {
             });
             var code = result.code;
             assert.strictEqual(code, "var a=function(n){return n};\n" +
-                "//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbIjAiXSwibmFtZXMiOlsiYSIsImZvbyJdLCJtYXBwaW5ncyI6IkFBQUEsR0FBSUEsR0FBSSxTQUFTQyxHQUFPLE1BQU9BIn0=");
+                "//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbIjAiXSwibmFtZXMiOlsiYSIsImZvbyJdLCJtYXBwaW5ncyI6IkFBQUEsSUFBSUEsRUFBSSxTQUFTQyxHQUFPLE9BQU9BIn0=");
         });
         it("should not append source map to output js when sourceMapInline is not enabled", function() {
             var result = Uglify.minify('var a = function(foo) { return foo; };');
             var code = result.code;
             assert.strictEqual(code, "var a=function(n){return n};");
         });
+        it("should work with max_line_len", function() {
+            var result = Uglify.minify(read("./test/input/issue-505/input.js"), {
+                output: {
+                    max_line_len: 20
+                },
+                sourceMap: {
+                    url: "inline"
+                }
+            });
+            assert.strictEqual(result.error, undefined);
+            assert.strictEqual(result.code, read("./test/input/issue-505/output.js"));
+        });
     });
 
     describe("#__PURE__", function() {
@@ -181,4 +200,31 @@ describe("minify", function() {
             assert.strictEqual(err.col, 12);
         });
     });
+
+    describe("global_defs", function() {
+        it("should throw for non-trivial expressions", function() {
+            var result = Uglify.minify("alert(42);", {
+                compress: {
+                    global_defs: {
+                        "@alert": "debugger"
+                    }
+                }
+            });
+            var err = result.error;
+            assert.ok(err instanceof Error);
+            assert.strictEqual(err.stack.split(/\n/)[0], "Error: Can't handle expression: debugger");
+        });
+        it("should skip inherited properties", function() {
+            var foo = Object.create({ skip: this });
+            foo.bar = 42;
+            var result = Uglify.minify("alert(FOO);", {
+                compress: {
+                    global_defs: {
+                        FOO: foo
+                    }
+                }
+            });
+            assert.strictEqual(result.code, "alert({bar:42});");
+        });
+    });
 });

test/mocha/release.js

@@ -1,23 +1,20 @@
 var assert = require("assert");
+var semver = require("semver");
 var spawn = require("child_process").spawn;
 
 if (!process.env.UGLIFYJS_TEST_ALL) return;
 
 function run(command, args, done) {
-    var id = setInterval(function() {
-        process.stdout.write("\0");
-    }, 5 * 60 * 1000);
     spawn(command, args, {
-        stdio: "ignore"
+        stdio: [ "ignore", 1, 2 ]
     }).on("exit", function(code) {
-        clearInterval(id);
         assert.strictEqual(code, 0);
         done();
     });
 }
 
 describe("test/benchmark.js", function() {
-    this.timeout(5 * 60 * 1000);
+    this.timeout(10 * 60 * 1000);
     [
         "-b",
         "-b bracketize",
@@ -36,11 +33,9 @@ describe("test/benchmark.js", function() {
     });
 });
 
+if (semver.satisfies(process.version, "0.12")) return;
 describe("test/jetstream.js", function() {
     this.timeout(20 * 60 * 1000);
-    it("Should install phantomjs-prebuilt", function(done) {
-        run("npm", ["install", "phantomjs-prebuilt@2.1.14"], done);
-    });
     [
         "-mc",
         "-mc keep_fargs=false,passes=3,pure_getters,unsafe,unsafe_comps,unsafe_math,unsafe_proto",
@@ -48,6 +43,7 @@ describe("test/jetstream.js", function() {
         it("Should pass with options " + options, function(done) {
             var args = options.split(/ /);
             args.unshift("test/jetstream.js");
+            args.push("-b", "beautify=false,webkit");
             run(process.argv[0], args, done);
         });
     });

test/mocha/spidermonkey.js

@@ -4,7 +4,7 @@ var uglify = require("../node");
 
 describe("spidermonkey export/import sanity test", function() {
     it("should produce a functional build when using --self with spidermonkey", function(done) {
-        this.timeout(30000);
+        this.timeout(60000);
 
         var uglifyjs = '"' + process.argv[0] + '" bin/uglifyjs';
         var command = uglifyjs + " --self -cm --wrap SpiderUglify -o spidermonkey | " +
@@ -15,7 +15,9 @@ describe("spidermonkey export/import sanity test", function() {
 
             eval(stdout);
             assert.strictEqual(typeof SpiderUglify, "object");
-            assert.strictEqual(SpiderUglify.minify("foo([true,,2+3]);").code, "foo([!0,,5]);");
+            var result = SpiderUglify.minify("foo([true,,2+3]);");
+            assert.strictEqual(result.error, undefined);
+            assert.strictEqual(result.code, "foo([!0,,5]);");
 
             done();
         });

test/mocha/yield.js

@@ -65,9 +65,9 @@ describe("Yield", function() {
         );
     });
 
-    it("Should not allow yield to be used as symbol, identifier or property outside generators in strict mode", function() {
+    it("Should not allow yield to be used as symbol, identifier or shorthand property outside generators in strict mode", function() {
         var tests = [
-            // Fail as as_symbol
+            // Fail in as_symbol
             '"use strict"; import yield from "bar";',
             '"use strict"; yield = 123;',
             '"use strict"; yield: "123";',
@@ -79,13 +79,12 @@ describe("Yield", function() {
             '"use strict"; var yield = "foo";',
             '"use strict"; class yield {}',
 
-            // Fail as maybe_assign
+            // Fail in maybe_assign
             '"use strict"; var foo = yield;',
             '"use strict"; var foo = bar = yield',
 
-            // Fail as as_property_name
+            // Fail in as_property_name
             '"use strict"; var foo = {yield};',
-            '"use strict"; var bar = {yield: "foo"};'
         ];
 
         var fail = function(e) {

test/run-tests.js

@@ -5,6 +5,7 @@ var path = require("path");
 var fs = require("fs");
 var assert = require("assert");
 var sandbox = require("./sandbox");
+var semver = require("semver");
 
 var tests_dir = path.dirname(module.filename);
 var failures = 0;
@@ -164,7 +165,8 @@ function run_compress_tests() {
                         failed_files[file] = 1;
                     }
                 }
-                if (test.expect_stdout) {
+                if (test.expect_stdout
+                    && (!test.node_version || semver.satisfies(process.version, test.node_version))) {
                     var stdout = sandbox.run_code(input_code);
                     if (test.expect_stdout === true) {
                         test.expect_stdout = stdout;
@@ -274,7 +276,14 @@ function parse_test(file) {
             if (node instanceof U.AST_LabeledStatement) {
                 var label = node.label;
                 assert.ok(
-                    ["input", "expect", "expect_exact", "expect_warnings", "expect_stdout"].indexOf(label.name) >= 0,
+                    [
+                        "input",
+                        "expect",
+                        "expect_exact",
+                        "expect_warnings",
+                        "expect_stdout",
+                        "node_version",
+                    ].indexOf(label.name) >= 0,
                     tmpl("Unsupported label {name} [{line},{col}]", {
                         name: label.name,
                         line: label.start.line,
@@ -282,11 +291,25 @@ function parse_test(file) {
                     })
                 );
                 var stat = node.body;
-                if (label.name == "expect_exact") {
+                if (label.name == "expect_exact" || label.name == "node_version") {
                     test[label.name] = read_string(stat);
                 } else if (label.name == "expect_stdout") {
-                    if (stat.TYPE == "SimpleStatement" && stat.body instanceof U.AST_Boolean) {
+                    var body = stat.body;
-                        test[label.name] = stat.body.value;
+                    if (body instanceof U.AST_Boolean) {
+                        test[label.name] = body.value;
+                    } else if (body instanceof U.AST_Call) {
+                        var ctor = global[body.expression.name];
+                        assert.ok(ctor === Error || ctor.prototype instanceof Error, tmpl("Unsupported expect_stdout format [{line},{col}]", {
+                            line: label.start.line,
+                            col: label.start.col
+                        }));
+                        test[label.name] = ctor.apply(null, body.args.map(function(node) {
+                            assert.ok(node instanceof U.AST_Constant, tmpl("Unsupported expect_stdout format [{line},{col}]", {
+                                line: label.start.line,
+                                col: label.start.col
+                            }));
+                            return node.value;
+                        }));
                     } else {
                         test[label.name] = read_string(stat) + "\n";
                     }

test/sandbox.js

@@ -1,3 +1,4 @@
+var semver = require("semver");
 var vm = require("vm");
 
 function safe_log(arg, level) {
@@ -18,23 +19,25 @@ function safe_log(arg, level) {
 
 var FUNC_TOSTRING = [
     "Function.prototype.toString = Function.prototype.valueOf = function() {",
-    "    var id = 0;",
+    "    var id = 100000;",
     "    return function() {",
     '        if (this === Array) return "[Function: Array]";',
     '        if (this === Object) return "[Function: Object]";',
     "        var i = this.name;",
     '        if (typeof i != "number") {',
     "            i = ++id;",
+].concat(Object.getOwnPropertyDescriptor(Function.prototype, "name").configurable ? [
     '            Object.defineProperty(this, "name", {',
     "                get: function() {",
     "                    return i;",
     "                }",
     "            });",
+] : [], [
     "        }",
     '        return "[Function: " + i + "]";',
     "    }",
     "}();",
-].join("\n");
+]).join("\n");
 exports.run_code = function(code) {
     var stdout = "";
     var original_write = process.stdout.write;
@@ -49,7 +52,10 @@ exports.run_code = function(code) {
             "}();",
         ].join("\n"), {
             console: {
-                log: function() {
+                log: function(msg) {
+                    if (arguments.length == 1 && typeof msg == "string") {
+                        return console.log("%s", msg);
+                    }
                     return console.log.apply(console, [].map.call(arguments, function(arg) {
                         return safe_log(arg, 3);
                     }));
@@ -63,7 +69,7 @@ exports.run_code = function(code) {
         process.stdout.write = original_write;
     }
 };
-exports.same_stdout = ~process.version.lastIndexOf("v0.12.", 0) ? function(expected, actual) {
+exports.same_stdout = semver.satisfies(process.version, "0.12") ? function(expected, actual) {
     if (typeof expected != typeof actual) return false;
     if (typeof expected != "string") {
         if (expected.name != actual.name) return false;

test/sourcemaps.js

@@ -1,4 +1,4 @@
-var UglifyJS = require("./node");
+var UglifyJS = require("..");
 var ok = require("assert");
 
 module.exports = function () {
@@ -26,11 +26,11 @@ module.exports = function () {
 }
 
 function source_map(js) {
-    var source_map = UglifyJS.SourceMap();
+    return JSON.parse(UglifyJS.minify(js, {
-    var stream = UglifyJS.OutputStream({ source_map: source_map });
+        compress: false,
-    var parsed = UglifyJS.parse(js);
+        mangle: false,
-    parsed.print(stream);
+        sourceMap: true
-    return JSON.parse(source_map.toString());
+    }).map);
 }
 
 // Run standalone

test/ufuzz.js

@@ -12,7 +12,7 @@
         stream._handle.setBlocking(true);
 });
 
-var UglifyJS = require("./node");
+var UglifyJS = require("..");
 var randomBytes = require("crypto").randomBytes;
 var sandbox = require("./sandbox");
 
@@ -102,23 +102,23 @@ for (var i = 2; i < process.argv.length; ++i) {
       case '--help':
       case '-h':
       case '-?':
-        console.log('** UglifyJS fuzzer help **');
+        println('** UglifyJS fuzzer help **');
-        console.log('Valid options (optional):');
+        println('Valid options (optional):');
-        console.log('<number>: generate this many cases (if used must be first arg)');
+        println('<number>: generate this many cases (if used must be first arg)');
-        console.log('-v: print every generated test case');
+        println('-v: print every generated test case');
-        console.log('-V: print every 100th generated test case');
+        println('-V: print every 100th generated test case');
-        console.log('-t <int>: generate this many toplevels per run (more take longer)');
+        println('-t <int>: generate this many toplevels per run (more take longer)');
-        console.log('-r <int>: maximum recursion depth for generator (higher takes longer)');
+        println('-r <int>: maximum recursion depth for generator (higher takes longer)');
-        console.log('-s1 <statement name>: force the first level statement to be this one (see list below)');
+        println('-s1 <statement name>: force the first level statement to be this one (see list below)');
-        console.log('-s2 <statement name>: force the second level statement to be this one (see list below)');
+        println('-s2 <statement name>: force the second level statement to be this one (see list below)');
-        console.log('--no-catch-redef: do not redefine catch variables');
+        println('--no-catch-redef: do not redefine catch variables');
-        console.log('--no-directive: do not generate directives');
+        println('--no-directive: do not generate directives');
-        console.log('--use-strict: generate "use strict"');
+        println('--use-strict: generate "use strict"');
-        console.log('--stmt-depth-from-func: reset statement depth counter at each function, counts from global otherwise');
+        println('--stmt-depth-from-func: reset statement depth counter at each function, counts from global otherwise');
-        console.log('--only-stmt <statement names>: a comma delimited white list of statements that may be generated');
+        println('--only-stmt <statement names>: a comma delimited white list of statements that may be generated');
-        console.log('--without-stmt <statement names>: a comma delimited black list of statements never to generate');
+        println('--without-stmt <statement names>: a comma delimited black list of statements never to generate');
-        console.log('List of accepted statement names: ' + Object.keys(STMT_ARG_TO_ID));
+        println('List of accepted statement names: ' + Object.keys(STMT_ARG_TO_ID));
-        console.log('** UglifyJS fuzzer exiting **');
+        println('** UglifyJS fuzzer exiting **');
         return 0;
       default:
         // first arg may be a number.
@@ -941,7 +941,17 @@ if (require.main !== module) {
     return;
 }
 
-function try_beautify(code, result) {
+function println(msg) {
+    if (typeof msg != "undefined") process.stdout.write(msg);
+    process.stdout.write("\n");
+}
+
+function errorln(msg) {
+    if (typeof msg != "undefined") process.stderr.write(msg);
+    process.stderr.write("\n");
+}
+
+function try_beautify(code, result, printfn) {
     var beautified = UglifyJS.minify(code, {
         compress: false,
         mangle: false,
@@ -951,51 +961,34 @@ function try_beautify(code, result) {
         },
     });
     if (beautified.error) {
-        console.log("// !!! beautify failed !!!");
+        printfn("// !!! beautify failed !!!");
-        console.log(beautified.error.stack);
+        printfn(beautified.error.stack);
     } else if (sandbox.same_stdout(sandbox.run_code(beautified.code), result)) {
-        console.log("// (beautified)");
+        printfn("// (beautified)");
-        console.log(beautified.code);
+        printfn(beautified.code);
         return;
     }
-    console.log("//");
+    printfn("//");
-    console.log(code);
+    printfn(code);
 }
 
-function infer_options(ctor) {
+var default_options = UglifyJS.default_options();
-    try {
-        ctor({ 0: 0 });
-    } catch (e) {
-        return e.defs;
-    }
-}
-
-var default_options = {
-    compress: infer_options(UglifyJS.Compressor),
-    mangle: {
-        "cache": null,
-        "eval": false,
-        "ie8": false,
-        "keep_fnames": false,
-        "toplevel": false,
-    },
-    output: infer_options(UglifyJS.OutputStream),
-};
 
 function log_suspects(minify_options, component) {
     var options = component in minify_options ? minify_options[component] : true;
     if (!options) return;
-    options = UglifyJS.defaults(options, default_options[component]);
+    if (typeof options != "object") options = {};
-    var suspects = Object.keys(default_options[component]).filter(function(name) {
+    var defs = default_options[component];
-        if (options[name]) {
+    var suspects = Object.keys(defs).filter(function(name) {
+        if ((name in options ? options : defs)[name]) {
             var m = JSON.parse(JSON.stringify(minify_options));
             var o = JSON.parse(JSON.stringify(options));
             o[name] = false;
             m[component] = o;
             var result = UglifyJS.minify(original_code, m);
             if (result.error) {
-                console.log("Error testing options." + component + "." + name);
+                errorln("Error testing options." + component + "." + name);
-                console.log(result.error);
+                errorln(result.error.stack);
             } else {
                 var r = sandbox.run_code(result.code);
                 return sandbox.same_stdout(original_result, r);
@@ -1003,49 +996,49 @@ function log_suspects(minify_options, component) {
         }
     });
     if (suspects.length > 0) {
-        console.log("Suspicious", component, "options:");
+        errorln("Suspicious " + component + " options:");
         suspects.forEach(function(name) {
-            console.log("  " + name);
+            errorln("  " + name);
         });
-        console.log();
+        errorln();
     }
 }
 
 function log(options) {
-    if (!ok) console.log('\n\n\n\n\n\n!!!!!!!!!!\n\n\n');
+    if (!ok) errorln('\n\n\n\n\n\n!!!!!!!!!!\n\n\n');
-    console.log("//=============================================================");
+    errorln("//=============================================================");
-    if (!ok) console.log("// !!!!!! Failed... round", round);
+    if (!ok) errorln("// !!!!!! Failed... round " + round);
-    console.log("// original code");
+    errorln("// original code");
-    try_beautify(original_code, original_result);
+    try_beautify(original_code, original_result, errorln);
-    console.log();
+    errorln();
-    console.log();
+    errorln();
-    console.log("//-------------------------------------------------------------");
+    errorln("//-------------------------------------------------------------");
     if (typeof uglify_code == "string") {
-        console.log("// uglified code");
+        errorln("// uglified code");
-        try_beautify(uglify_code, uglify_result);
+        try_beautify(uglify_code, uglify_result, errorln);
-        console.log();
+        errorln();
-        console.log();
+        errorln();
-        console.log("original result:");
+        errorln("original result:");
-        console.log(original_result);
+        errorln(typeof original_result == "string" ? original_result : original_result.stack);
-        console.log("uglified result:");
+        errorln("uglified result:");
-        console.log(uglify_result);
+        errorln(typeof uglify_result == "string" ? uglify_result : uglify_result.stack);
     } else {
-        console.log("// !!! uglify failed !!!");
+        errorln("// !!! uglify failed !!!");
-        console.log(uglify_code.stack);
+        errorln(uglify_code.stack);
         if (typeof original_result != "string") {
-            console.log();
+            errorln();
-            console.log();
+            errorln();
-            console.log("original stacktrace:");
+            errorln("original stacktrace:");
-            console.log(original_result.stack);
+            errorln(original_result.stack);
         }
     }
-    console.log("minify(options):");
+    errorln("minify(options):");
     options = JSON.parse(options);
-    console.log(options);
+    errorln(JSON.stringify(options, null, 2));
-    console.log();
+    errorln();
     if (!ok && typeof uglify_code == "string") {
         Object.keys(default_options).forEach(log_suspects.bind(null, options));
-        console.log("!!!!!! Failed... round", round);
+        errorln("!!!!!! Failed... round " + round);
     }
 }
 
@@ -1075,19 +1068,19 @@ for (var round = 1; round <= num_iterations; round++) {
         }
         if (verbose || (verbose_interval && !(round % INTERVAL_COUNT)) || !ok) log(options);
         else if (typeof original_result != "string") {
-            console.log("//=============================================================");
+            println("//=============================================================");
-            console.log("// original code");
+            println("// original code");
-            try_beautify(original_code, original_result);
+            try_beautify(original_code, original_result, println);
-            console.log();
+            println();
-            console.log();
+            println();
-            console.log("original result:");
+            println("original result:");
-            console.log(original_result);
+            println(original_result.stack);
-            console.log();
+            println();
         }
         if (!ok && isFinite(num_iterations)) {
-            console.log();
+            println();
             process.exit(1);
         }
     });
 }
-console.log();
+println();

tools/exports.js

@@ -1,4 +1,5 @@
 exports["Dictionary"] = Dictionary;
 exports["TreeWalker"] = TreeWalker;
+exports["TreeTransformer"] = TreeTransformer;
 exports["minify"] = minify;
 exports["_push_uniq"] = push_uniq;

tools/node.js

@@ -61,5 +61,22 @@ function describe_ast() {
         }
     };
     doitem(AST_Node);
-    return out + "";
+    return out + "\n";
 }
+
+function infer_options(options) {
+    var result = UglifyJS.minify("", options);
+    return result.error && result.error.defs;
+}
+
+UglifyJS.default_options = function() {
+    var defs = {};
+    Object.keys(infer_options({ 0: 0 })).forEach(function(component) {
+        var options = {};
+        options[component] = { 0: 0 };
+        if (options = infer_options(options)) {
+            defs[component] = options;
+        }
+    });
+    return defs;
+};