v3.3.11

fixes #2916

.github/ISSUE_TEMPLATE.md

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

CONTRIBUTING.md

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

LICENSE

@@ -1,6 +1,6 @@
 UglifyJS is released under the BSD license:
 
-Copyright 2012-2013 (c) Mihai Bazon <mihai.bazon@gmail.com>
+Copyright 2012-2018 (c) Mihai Bazon <mihai.bazon@gmail.com>
 
 Redistribution and use in source and binary forms, with or without
 modification, are permitted provided that the following conditions

README.md

@@ -1,11 +1,14 @@
-uglify-es
-=========
+UglifyJS 3
+==========
 
-A JavaScript parser, mangler/compressor and beautifier toolkit for ES6+.
+UglifyJS is a JavaScript parser, minifier, compressor and beautifier toolkit.
 
 #### Note:
-- **`uglify-es` is API/CLI compatible with `uglify-js@3`.**
-- **`uglify-es` is not backwards compatible with `uglify-js@2`.**
+- **`uglify-js@3` has a simplified [API](#api-reference) and [CLI](#command-line-usage) that is not backwards compatible with [`uglify-js@2`](https://github.com/mishoo/UglifyJS2/tree/v2.x)**.
+- **Documentation for UglifyJS `2.x` releases can be found [here](https://github.com/mishoo/UglifyJS2/tree/v2.x)**.
+- `uglify-js` only supports ECMAScript 5 (ES5).
+- Those wishing to minify
+ES2015+ (ES6+) should use the `npm` package [**uglify-es**](https://github.com/mishoo/UglifyJS2/tree/harmony).
 
 Install
 -------
@@ -15,11 +18,11 @@ First make sure you have installed the latest version of [node.js](http://nodejs
 
 From NPM for use as a command line app:
 
-    npm install uglify-es -g
+    npm install uglify-js -g
 
 From NPM for programmatic use:
 
-    npm install uglify-es
+    npm install uglify-js
 
 # Command line usage
 
@@ -67,7 +70,7 @@ a double dash to prevent input files being used as option arguments:
                                 `debug`  Add debug prefix and suffix.
                                 `domprops`  Mangle property names that overlaps
                                             with DOM properties.
-                                `keep_quoted`  Only mangle unquoted properies.
+                                `keep_quoted`  Only mangle unquoted properties.
                                 `regex`  Only mangle matched property names.
                                 `reserved`  List of names that should not be mangled.
     -b, --beautify [options]    Beautify output/specify output options:
@@ -102,7 +105,6 @@ a double dash to prevent input files being used as option arguments:
                                 sequences.
     --config-file <file>        Read `minify()` options from JSON file.
     -d, --define <expr>[=value] Global definitions.
-    --ecma <version>            Specifiy ECMAScript release: 5, 6, 7 or 8.
     --ie8                       Support non-standard Internet Explorer 8.
                                 Equivalent to setting `ie8: true` in `minify()`
                                 for `compress`, `mangle` and `output` options.
@@ -151,10 +153,10 @@ Additional options:
 - `--source-map "filename='<NAME>'"` to specify the name of the source map.
 
 - `--source-map "root='<URL>'"` to pass the URL where the original files can be found.
-  Otherwise UglifyJS assumes HTTP `X-SourceMap` is being used and will omit the
-  `//# sourceMappingURL=` directive.
 
 - `--source-map "url='<URL>'"` to specify the URL where the source map can be found.
+  Otherwise UglifyJS assumes HTTP `X-SourceMap` is being used and will omit the
+  `//# sourceMappingURL=` directive.
 
 For example:
 
@@ -201,11 +203,9 @@ Example:
 To enable the mangler you need to pass `--mangle` (`-m`).  The following
 (comma-separated) options are supported:
 
-- `toplevel` — mangle names declared in the top level scope (disabled by
-  default).
+- `toplevel` (default `false`) -- mangle names declared in the top level scope.
 
-- `eval` — mangle names visible in scopes where `eval` or `with` are used
-  (disabled by default).
+- `eval` (default `false`) -- mangle names visible in scopes where `eval` or `with` are used.
 
 When mangling is enabled but you want to prevent certain names from being
 mangled, you can declare those names with `--mangle reserved` — pass a
@@ -221,7 +221,7 @@ to prevent the `require`, `exports` and `$` names from being changed.
 is a separate step, different from variable name mangling.  Pass
 `--mangle-props` to enable it.  It will mangle all properties in the
 input code with the exception of built in DOM properties and properties
-in core javascript classes.  For example:
+in core JavaScript classes.  For example:
 
 ```javascript
 // example.js
@@ -236,7 +236,7 @@ x.bar_ = 2;
 x["baz_"] = 3;
 console.log(x.calc());
 ```
-Mangle all properties (except for javascript `builtins`):
+Mangle all properties (except for JavaScript `builtins`):
 ```bash
 $ uglifyjs example.js -c -m --mangle-props
 ```
@@ -345,7 +345,7 @@ identify mistakes like writing mangled keys to storage.
 Assuming installation via NPM, you can load UglifyJS in your application
 like this:
 ```javascript
-var UglifyJS = require("uglify-es");
+var UglifyJS = require("uglify-js");
 ```
 
 There is a single high level function, **`minify(code, options)`**,
@@ -474,9 +474,6 @@ if (result.error) throw result.error;
 
 ## Minify options
 
-- `ecma` (default `undefined`) - pass `5`, `6`, `7` or `8` to override `parse`,
-  `compress` and `output` options.
-
 - `warnings` (default `false`) — pass `true` to return compressor warnings
   in `result.warnings`. Use the value `"verbose"` for more detailed warnings.
 
@@ -511,6 +508,9 @@ if (result.error) throw result.error;
 
 - `ie8` (default `false`) - set to `true` to support IE8.
 
+- `keep_fnames` (default: `false`) - pass `true` to prevent discarding or mangling
+  of function names.  Useful for code relying on `Function.prototype.name`.
+
 ## Minify options structure
 
 ```javascript
@@ -534,7 +534,6 @@ if (result.error) throw result.error;
     sourceMap: {
         // source map options
     },
-    ecma: 5, // specify one of: 5, 6, 7 or 8
     nameCache: null, // or specify a name cache object
     toplevel: false,
     ie8: false,
@@ -592,125 +591,90 @@ If you're using the `X-SourceMap` header instead, you can just omit `sourceMap.u
 ## Parse options
 
 - `bare_returns` (default `false`) -- support top level `return` statements
-- `ecma` (default: `8`) -- specify one of `5`, `6`, `7` or `8`. Note: this setting
-  is not presently enforced except for ES8 optional trailing commas in function
-  parameter lists and calls with `ecma` `8`.
+
 - `html5_comments` (default `true`)
+
 - `shebang` (default `true`) -- support `#!command` as the first line
 
 ## Compress options
 
-- `sequences` (default: true) -- join consecutive simple statements using the
-  comma operator.  May be set to a positive integer to specify the maximum number
-  of consecutive comma sequences that will be generated. If this option is set to
-  `true` then the default `sequences` limit is `200`. Set option to `false` or `0`
-  to disable. The smallest `sequences` length is `2`. A `sequences` value of `1`
-  is grandfathered to be equivalent to `true` and as such means `200`. On rare
-  occasions the default sequences limit leads to very slow compress times in which
-  case a value of `20` or less is recommended.
+- `booleans` (default: `true`) -- various optimizations for boolean context,
+  for example `!!a ? b : c → a ? b : c`
 
-- `properties` -- rewrite property access using the dot notation, for
-  example `foo["bar"] → foo.bar`
+- `collapse_vars` (default: `true`) -- Collapse single-use non-constant variables,
+  side effects permitting.
 
-- `dead_code` -- remove unreachable code
-
-- `drop_debugger` -- remove `debugger;` statements
-
-- `unsafe` (default: false) -- apply "unsafe" transformations (discussion below)
-
-- `unsafe_comps` (default: false) -- Reverse `<` and `<=` to `>` and `>=` to
-  allow improved compression. This might be unsafe when an at least one of two
-  operands is an object with computed values due the use of methods like `get`,
-  or `valueOf`. This could cause change in execution order after operands in the
-  comparison are switching. Compression only works if both `comparisons` and
-  `unsafe_comps` are both set to true.
-
-- `unsafe_Func` (default: false) -- compress and mangle `Function(args, code)`
-  when both `args` and `code` are string literals.
-
-- `unsafe_math` (default: false) -- optimize numerical expressions like
-  `2 * x * 3` into `6 * x`, which may give imprecise floating point results.
-
-- `unsafe_proto` (default: false) -- optimize expressions like
-  `Array.prototype.slice.call(a)` into `[].slice.call(a)`
-
-- `unsafe_regexp` (default: false) -- enable substitutions of variables with
-  `RegExp` values the same way as if they are constants.
-
-- `conditionals` -- apply optimizations for `if`-s and conditional
-  expressions
-
-- `comparisons` -- apply certain optimizations to binary nodes, for example:
-  `!(a <= b) → a > b` (only when `unsafe_comps`), attempts to negate binary
+- `comparisons` (default: `true`) -- apply certain optimizations to binary nodes,
+  e.g. `!(a <= b) → a > b` (only when `unsafe_comps`), attempts to negate binary
   nodes, e.g. `a = !b && !c && !d && !e → a=!(b||c||d||e)` etc.
 
-- `evaluate` -- attempt to evaluate constant expressions
+- `conditionals` (default: `true`) -- apply optimizations for `if`-s and conditional
+  expressions
 
-- `arrows` (default `true`) -- Converts `()=>{return x}` to `()=>x`. Class
-  and object literal methods will also be converted to arrow expressions if
-  the resultant code is shorter: `m(){return x}` becomes `m:()=>x`.
-  This transform requires that the `ecma` compress option is set to `6` or greater.
+- `dead_code` (default: `true`) -- remove unreachable code
 
-- `unsafe_arrows` (default `false`) -- Convert ES5 style anonymous function
-  expressions to arrow functions if the function body does not reference `this`.
-  Note: it is not always safe to perform this conversion if code relies on the
-  the function having a `prototype`, which arrow functions lack.
-  This transform requires that the `ecma` compress option is set to `6` or greater.
+- `drop_console` (default: `false`) -- Pass `true` to discard calls to
+  `console.*` functions. If you wish to drop a specific function call
+  such as `console.info` and/or retain side effects from function arguments
+  after dropping the function call then use `pure_funcs` instead.
 
-- `booleans` -- various optimizations for boolean context, for example `!!a
-  ? b : c → a ? b : c`
+- `drop_debugger` (default: `true`) -- remove `debugger;` statements
 
-- `typeofs` -- default `true`.  Transforms `typeof foo == "undefined"` into
-  `foo === void 0`.  Note: recommend to set this value to `false` for IE10 and
-  earlier versions due to known issues.
+- `evaluate` (default: `true`) -- attempt to evaluate constant expressions
 
-- `loops` -- optimizations for `do`, `while` and `for` loops when we can
-  statically determine the condition
+- `expression` (default: `false`) -- Pass `true` to preserve completion values
+  from terminal statements without `return`, e.g. in bookmarklets.
 
-- `unused` -- drop unreferenced functions and variables (simple direct variable
-  assignments do not count as references unless set to `"keep_assign"`)
+- `global_defs` (default: `{}`) -- see [conditional compilation](#conditional-compilation)
 
-- `toplevel` -- drop unreferenced functions (`"funcs"`) and/or variables (`"vars"`)
-  in the top level scope (`false` by default, `true` to drop both unreferenced
-  functions and variables)
+- `hoist_funs` (default: `false`) -- hoist function declarations
 
-- `top_retain` -- prevent specific toplevel functions and variables from `unused`
-  removal (can be array, comma-separated, RegExp or function. Implies `toplevel`)
+- `hoist_props` (default: `true`) -- hoist properties from constant object and
+  array literals into regular variables subject to a set of constraints. For example:
+  `var o={p:1, q:2}; f(o.p, o.q);` is converted to `f(1, 2);`. Note: `hoist_props`
+  works best with `mangle` enabled, the `compress` option `passes` set to `2` or higher,
+  and the `compress` option `toplevel` enabled.
 
-- `hoist_funs` -- hoist function declarations
-
-- `hoist_vars` (default: false) -- hoist `var` declarations (this is `false`
+- `hoist_vars` (default: `false`) -- hoist `var` declarations (this is `false`
   by default because it seems to increase the size of the output in general)
 
-- `if_return` -- optimizations for if/return and if/continue
+- `if_return` (default: `true`) -- optimizations for if/return and if/continue
 
-- `inline` -- embed simple functions
+- `inline` (default: `true`) -- inline calls to function with simple/`return` statement:
+  - `false` -- same as `0`
+  - `0` -- disabled inlining
+  - `1` -- inline simple functions
+  - `2` -- inline functions with arguments
+  - `3` -- inline functions with arguments and variables
+  - `true` -- same as `3`
 
-- `join_vars` -- join consecutive `var` statements
+- `join_vars` (default: `true`) -- join consecutive `var` statements
 
-- `cascade` -- small optimization for sequences, transform `x, x` into `x`
-  and `x = something(), x` into `x = something()`
+- `keep_fargs` (default: `true`) -- Prevents the compressor from discarding unused
+  function arguments.  You need this for code which relies on `Function.length`.
 
-- `collapse_vars` -- Collapse single-use non-constant variables - side
-  effects permitting.
+- `keep_fnames` (default: `false`) -- Pass `true` to prevent the
+  compressor from discarding function names.  Useful for code relying on
+  `Function.prototype.name`. See also: the `keep_fnames` [mangle option](#mangle).
 
-- `reduce_vars` -- Improve optimization on variables assigned with and
-  used as constant values.
+- `keep_infinity` (default: `false`) -- Pass `true` to prevent `Infinity` from
+  being compressed into `1/0`, which may cause performance issues on Chrome.
 
-- `warnings` -- display warnings when dropping unreachable code or unused
-  declarations etc.
+- `loops` (default: `true`) -- optimizations for `do`, `while` and `for` loops
+  when we can statically determine the condition.
 
-- `negate_iife` -- negate "Immediately-Called Function Expressions"
+- `negate_iife` (default: `true`) -- negate "Immediately-Called Function Expressions"
   where the return value is discarded, to avoid the parens that the
   code generator would insert.
 
-- `pure_getters` -- the default is `false`.  If you pass `true` for
-  this, UglifyJS will assume that object property access
-  (e.g. `foo.bar` or `foo["bar"]`) doesn't have any side effects.
-  Specify `"strict"` to treat `foo.bar` as side-effect-free only when
-  `foo` is certain to not throw, i.e. not `null` or `undefined`.
+- `passes` (default: `1`) -- The maximum number of times to run compress.
+  In some cases more than one pass leads to further compressed code.  Keep in
+  mind more passes will take more time.
 
-- `pure_funcs` -- default `null`.  You can pass an array of names and
+- `properties` (default: `true`) -- rewrite property access using the dot notation, for
+  example `foo["bar"] → foo.bar`
+
+- `pure_funcs` (default: `null`) -- You can pass an array of names and
   UglifyJS will assume that those functions do not produce side
   effects.  DANGER: will not check if the name is redefined in scope.
   An example case here, for instance `var q = Math.floor(a/b)`.  If
@@ -721,57 +685,94 @@ If you're using the `X-SourceMap` header instead, you can just omit `sourceMap.u
   statement would get discarded.  The current implementation adds some
   overhead (compression will be slower).
 
-- `drop_console` -- default `false`.  Pass `true` to discard calls to
-  `console.*` functions. If you wish to drop a specific function call
-  such as `console.info` and/or retain side effects from function arguments
-  after dropping the function call then use `pure_funcs` instead.
+- `pure_getters` (default: `"strict"`) -- If you pass `true` for
+  this, UglifyJS will assume that object property access
+  (e.g. `foo.bar` or `foo["bar"]`) doesn't have any side effects.
+  Specify `"strict"` to treat `foo.bar` as side-effect-free only when
+  `foo` is certain to not throw, i.e. not `null` or `undefined`.
 
-- `expression` -- default `false`.  Pass `true` to preserve completion values
-  from terminal statements without `return`, e.g. in bookmarklets.
+- `reduce_funcs` (default: `true`) -- Allows single-use functions to be
+  inlined as function expressions when permissible allowing further
+  optimization.  Enabled by default.  Option depends on `reduce_vars`
+  being enabled.  Some code runs faster in the Chrome V8 engine if this
+  option is disabled.  Does not negatively impact other major browsers.
 
-- `keep_fargs` -- default `true`.  Prevents the
-  compressor from discarding unused function arguments.  You need this
-  for code which relies on `Function.length`.
+- `reduce_vars` (default: `true`) -- Improve optimization on variables assigned with and
+  used as constant values.
 
-- `keep_fnames` -- default `false`.  Pass `true` to prevent the
-  compressor from discarding function names.  Useful for code relying on
-  `Function.prototype.name`. See also: the `keep_fnames` [mangle option](#mangle).
+- `sequences` (default: `true`) -- join consecutive simple statements using the
+  comma operator.  May be set to a positive integer to specify the maximum number
+  of consecutive comma sequences that will be generated. If this option is set to
+  `true` then the default `sequences` limit is `200`. Set option to `false` or `0`
+  to disable. The smallest `sequences` length is `2`. A `sequences` value of `1`
+  is grandfathered to be equivalent to `true` and as such means `200`. On rare
+  occasions the default sequences limit leads to very slow compress times in which
+  case a value of `20` or less is recommended.
 
-- `passes` -- default `1`. The maximum number of times to run compress.
-  In some cases more than one pass leads to further compressed code.  Keep in
-  mind more passes will take more time.
-
-- `keep_infinity` -- default `false`. Pass `true` to prevent `Infinity` from
-  being compressed into `1/0`, which may cause performance issues on Chrome.
-
-- `side_effects` -- default `true`. Pass `false` to disable potentially dropping
+- `side_effects` (default: `true`) -- Pass `false` to disable potentially dropping
   functions marked as "pure".  A function call is marked as "pure" if a comment
   annotation `/*@__PURE__*/` or `/*#__PURE__*/` immediately precedes the call. For
   example: `/*@__PURE__*/foo();`
 
-- `ecma` -- default `5`. Pass `6` or greater to enable `compress` options that
-  will transform ES5 code into smaller ES6+ equivalent forms.
+- `switches` (default: `true`) -- de-duplicate and remove unreachable `switch` branches
+
+- `toplevel` (default: `false`) -- drop unreferenced functions (`"funcs"`) and/or
+  variables (`"vars"`) in the top level scope (`false` by default, `true` to drop
+  both unreferenced functions and variables)
+
+- `top_retain` (default: `null`) -- prevent specific toplevel functions and
+  variables from `unused` removal (can be array, comma-separated, RegExp or
+  function. Implies `toplevel`)
+
+- `typeofs` (default: `true`) -- Transforms `typeof foo == "undefined"` into
+  `foo === void 0`.  Note: recommend to set this value to `false` for IE10 and
+  earlier versions due to known issues.
+
+- `unsafe` (default: `false`) -- apply "unsafe" transformations (discussion below)
+
+- `unsafe_comps` (default: `false`) -- Reverse `<` and `<=` to `>` and `>=` to
+  allow improved compression. This might be unsafe when an at least one of two
+  operands is an object with computed values due the use of methods like `get`,
+  or `valueOf`. This could cause change in execution order after operands in the
+  comparison are switching. Compression only works if both `comparisons` and
+  `unsafe_comps` are both set to true.
+
+- `unsafe_Function` (default: `false`) -- compress and mangle `Function(args, code)`
+  when both `args` and `code` are string literals.
+
+- `unsafe_math` (default: `false`) -- optimize numerical expressions like
+  `2 * x * 3` into `6 * x`, which may give imprecise floating point results.
+
+- `unsafe_proto` (default: `false`) -- optimize expressions like
+  `Array.prototype.slice.call(a)` into `[].slice.call(a)`
+
+- `unsafe_regexp` (default: `false`) -- enable substitutions of variables with
+  `RegExp` values the same way as if they are constants.
+
+- `unsafe_undefined` (default: `false`) -- substitute `void 0` if there is a
+  variable named `undefined` in scope (variable name will be mangled, typically
+  reduced to a single character)
+
+- `unused` (default: `true`) -- drop unreferenced functions and variables (simple
+  direct variable assignments do not count as references unless set to `"keep_assign"`)
+
+- `warnings` (default: `false`) -- display warnings when dropping unreachable
+  code or unused declarations etc.
 
 ## Mangle options
 
-- `reserved` (default `[]`). Pass an array of identifiers that should be
-  excluded from mangling. Example: `["foo", "bar"]`.
+- `eval` (default `false`) -- Pass `true` to mangle names visible in scopes
+  where `eval` or `with` are used.
 
-- `toplevel` (default `false`). Pass `true` to mangle names declared in the
-  top level scope.
-
-- `keep_classnames` (default `false`).  Pass `true` to not mangle class names.
-
-- `keep_fnames` (default `false`).  Pass `true` to not mangle function names.
+- `keep_fnames` (default `false`) -- Pass `true` to not mangle function names.
   Useful for code relying on `Function.prototype.name`. See also: the `keep_fnames`
   [compress option](#compress-options).
 
-- `eval` (default `false`). Pass `true` to mangle names visible in scopes
-  where `eval` or `with` are used.
+- `reserved` (default `[]`) -- Pass an array of identifiers that should be
+  excluded from mangling. Example: `["foo", "bar"]`.
 
-- `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".
+- `toplevel` (default `false`) -- Pass `true` to mangle names declared in the
+  top level scope.
 
 Examples:
 
@@ -797,16 +798,20 @@ UglifyJS.minify(code, { mangle: { toplevel: true } }).code;
 
 ### 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.
 
+- `debug` (default: `false`) -— Mangle names with the original name still present.
+  Pass an empty string `""` to enable, or a non-empty string to set the debug suffix.
+
+- `keep_quoted` (default: `false`) -— Only mangle unquoted property names.
+
+- `regex` (default: `null`) -— Pass a RegExp literal to only mangle property
+  names matching the regular expression.
+
+- `reserved` (default: `[]`) -- Do not mangle property names listed in the
+  `reserved` array.
+
 ## Output options
 
 The code generator tries to output shortest code possible by default.  In
@@ -815,37 +820,43 @@ 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. Set `ecma` to `6` or
-  greater to emit shorthand object properties - i.e.: `{a}` instead of `{a: a}`.
-  The `ecma` option will only change the output in direct control of the
-  beautifier. Non-compatible features in the abstract syntax tree will still
-  be output as is. For example: an `ecma` setting of `5` will **not** convert
-  ES6+ code to ES5.
-- `indent_level` (default 4)
-- `indent_start` (default 0) -- prefix all lines by that many spaces
+
+- `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
@@ -853,16 +864,23 @@ can pass additional arguments that control the code output:
   - `1` -- always use single quotes
   - `2` -- always use double quotes
   - `3` -- always use the original quotes
+
 - `semicolons` (default `true`) -- separate statements with semicolons.  If
   you pass `false` then whenever possible we will use a newline instead of a
   semicolon, leading to more readable output of uglified code (size before
   gzip could be smaller; size after gzip insignificantly larger).
+
 - `shebang` (default `true`) -- preserve shebang `#!` in preamble (bash scripts)
-- `width` (default 80) -- only takes effect when beautification is on, this
+
+- `webkit` (default `false`) -- enable workarounds for WebKit bugs.
+  PhantomJS users should set this option to `true`.
+
+- `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.
@@ -908,9 +926,6 @@ when this flag is on:
 - `new Object()` → `{}`
 - `String(exp)` or `exp.toString()` → `"" + exp`
 - `new Object/RegExp/Function/Error/Array (...)` → we discard the `new`
-- `void 0` → `undefined` (if there is a variable named "undefined" in
-  scope; we do it because the variable name will be mangled, typically
-  reduced to a single character)
 
 ### Conditional compilation
 
@@ -1064,7 +1079,7 @@ in total it's a bit more than just using UglifyJS's own parser.
 ### Uglify Fast Minify Mode
 
 It's not well known, but whitespace removal and symbol mangling accounts
-for 95% of the size reduction in minified code for most javascript - not
+for 95% of the size reduction in minified code for most JavaScript - not
 elaborate code transforms. One can simply disable `compress` to speed up
 Uglify builds by 3 to 4 times. In this fast `mangle`-only mode Uglify has
 comparable minify speeds and gzip sizes to
@@ -1087,3 +1102,27 @@ To enable fast minify mode with the API use:
 ```js
 UglifyJS.minify(code, { compress: false, mangle: true });
 ```
+
+#### Source maps and debugging
+
+Various `compress` transforms that simplify, rearrange, inline and remove code
+are known to have an adverse effect on debugging with source maps. This is
+expected as code is optimized and mappings are often simply not possible as
+some code no longer exists. For highest fidelity in source map debugging
+disable the Uglify `compress` option and just use `mangle`.
+
+### Compiler assumptions
+
+To allow for better optimizations, the compiler makes various assumptions:
+
+- `.toString()` and `.valueOf()` don't have side effects, and for built-in
+  objects they have not been overridden.
+- `undefined`, `NaN` and `Infinity` have not been externally redefined.
+- `arguments.callee`, `arguments.caller` and `Function.prototype.caller` are not used.
+- The code doesn't expect the contents of `Function.prototype.toString()` or
+  `Error.prototype.stack` to be anything in particular.
+- Getting and setting properties on a plain object does not cause other side effects
+  (using `.watch()` or `Proxy`).
+- Object properties can be added, removed and modified (not prevented with
+  `Object.defineProperty()`, `Object.defineProperties()`, `Object.freeze()`,
+  `Object.preventExtensions()` or `Object.seal()`).

appveyor.yml

@@ -1,24 +1,20 @@
 environment:
   matrix:
-  - nodejs_version: "0.10"
-  - nodejs_version: "0.12"
-  - nodejs_version: "4.0"
-  - nodejs_version: "6.0"
-
+    - nodejs_version: "0.10"
+    - nodejs_version: "0.12"
+    - nodejs_version: "4"
+    - nodejs_version: "6"
+    - nodejs_version: "8"
+install:
+  - ps: Install-Product node $env:nodejs_version
+  - set UGLIFYJS_TEST_ALL=1
+  - npm install
+build: off
+cache:
+  - tmp
 matrix:
   fast_finish: true
-
-platform:
-  - x86
-  - x64
-
-install:
-  - ps: Install-Product node $env:nodejs_version $env:platform
-  - npm install
-
 test_script:
   - node --version
   - npm --version
   - npm test
-
-build: off

bin/uglifyjs

@@ -3,11 +3,7 @@
 
 "use strict";
 
-// workaround for tty output truncation upon process.exit()
-[process.stdout, process.stderr].forEach(function(stream){
-    if (stream._handle && stream._handle.setBlocking)
-        stream._handle.setBlocking(true);
-});
+require("../tools/exit");
 
 var fs = require("fs");
 var info = require("../package.json");
@@ -15,7 +11,7 @@ var path = require("path");
 var program = require("commander");
 var UglifyJS = require("../tools/node");
 
-var skip_keys = [ "cname", "enclosed", "parent_scope", "scope", "thedef", "uses_eval", "uses_with" ];
+var skip_keys = [ "cname", "inlined", "parent_scope", "scope", "uses_eval", "uses_with" ];
 var files = {};
 var options = {
     compress: false,
@@ -44,10 +40,11 @@ program.option("-o, --output <file>", "Output file (default STDOUT).");
 program.option("--comments [filter]", "Preserve copyright comments in the output.");
 program.option("--config-file <file>", "Read minify() options from JSON file.");
 program.option("-d, --define <expr>[=value]", "Global definitions.", parse_js("define"));
-program.option("--ecma <version>", "Specifiy ECMAScript release: 5, 6, 7 or 8.");
 program.option("--ie8", "Support non-standard Internet Explorer 8.");
 program.option("--keep-fnames", "Do not mangle/drop function names. Useful for code relying on Function.prototype.name.");
 program.option("--name-cache <file>", "File to hold mangled name mappings.");
+program.option("--rename", "Force symbol expansion.");
+program.option("--no-rename", "Disable symbol expansion.");
 program.option("--self", "Build UglifyJS as a library (implies --wrap UglifyJS)");
 program.option("--source-map [options]", "Enable source map/specify source map options.", parse_source_map());
 program.option("--timings", "Display operations run time on STDERR.")
@@ -74,10 +71,6 @@ if (!program.output && program.sourceMap && program.sourceMap.url != "inline") {
         options[name] = program[name];
     }
 });
-if ("ecma" in program) {
-    if (program.ecma != (program.ecma | 0)) fatal("ERROR: ecma must be an integer");
-    options.ecma = program.ecma | 0;
-}
 if (program.beautify) {
     options.output = typeof program.beautify == "object" ? program.beautify : {};
     if (!("beautify" in options.output)) {
@@ -127,6 +120,11 @@ if (program.parse) {
         fatal("ERROR: inline source map only works with built-in parser");
     }
 }
+if (~program.rawArgs.indexOf("--rename")) {
+    options.rename = true;
+} else if (!program.rename) {
+    options.rename = false;
+}
 var convert_path = function(name) {
     return name;
 };
@@ -229,7 +227,20 @@ function run() {
         }
         fatal(ex);
     } else if (program.output == "ast") {
+        if (!options.compress && !options.mangle) {
+            result.ast.figure_out_scope({});
+        }
         print(JSON.stringify(result.ast, function(key, value) {
+            if (value) switch (key) {
+              case "thedef":
+                return symdef(value);
+              case "enclosed":
+                return value.length ? value.map(symdef) : undefined;
+              case "variables":
+              case "functions":
+              case "globals":
+                return value.size() ? value.map(symdef) : undefined;
+            }
             if (skip_key(key)) return;
             if (value instanceof UglifyJS.AST_Token) return;
             if (value instanceof UglifyJS.Dictionary) return;
@@ -383,6 +394,12 @@ function skip_key(key) {
     return skip_keys.indexOf(key) >= 0;
 }
 
+function symdef(def) {
+    var ret = (1e6 + def.id) + " " + def.name;
+    if (def.mangled_name) ret += " " + def.mangled_name;
+    return ret;
+}
+
 function format_object(obj) {
     var lines = [];
     var padding = "";

lib/ast.js

@@ -87,7 +87,7 @@ function DEFNODE(type, props, methods, base) {
     return ctor;
 };
 
-var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before file raw", {
+var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos nlb comments_before comments_after file raw", {
 }, null);
 
 var AST_Node = DEFNODE("Node", "start end", {
@@ -134,11 +134,10 @@ var AST_Debugger = DEFNODE("Debugger", null, {
     $documentation: "Represents a debugger statement",
 }, AST_Statement);
 
-var AST_Directive = DEFNODE("Directive", "value scope quote", {
+var AST_Directive = DEFNODE("Directive", "value quote", {
     $documentation: "Represents a directive, like \"use strict\";",
     $propdoc: {
         value: "[string] The value of this directive as a plain string (it's not an AST_String!)",
-        scope: "[AST_Scope/S] The scope that this directive affects",
         quote: "[string] the original quote character"
     },
 }, AST_Statement);
@@ -157,7 +156,7 @@ var AST_SimpleStatement = DEFNODE("SimpleStatement", "body", {
 
 function walk_body(node, visitor) {
     var body = node.body;
-    if (body instanceof AST_Node) {
+    if (body instanceof AST_Statement) {
         body._walk(visitor);
     }
     else for (var i = 0, len = body.length; i < len; i++) {
@@ -268,11 +267,10 @@ var AST_For = DEFNODE("For", "init condition step", {
     }
 }, AST_IterationStatement);
 
-var AST_ForIn = DEFNODE("ForIn", "init name object", {
+var AST_ForIn = DEFNODE("ForIn", "init object", {
     $documentation: "A `for ... in` statement",
     $propdoc: {
         init: "[AST_Node] the `for/in` initialization code",
-        name: "[AST_SymbolRef?] the loop variable, only if `init` is AST_Var",
         object: "[AST_Node] the object that we're looping through"
     },
     _walk: function(visitor) {
@@ -284,10 +282,6 @@ var AST_ForIn = DEFNODE("ForIn", "init name object", {
     }
 }, AST_IterationStatement);
 
-var AST_ForOf = DEFNODE("ForOf", null, {
-    $documentation: "A `for ... of` statement",
-}, AST_ForIn);
-
 var AST_With = DEFNODE("With", "expression", {
     $documentation: "A `with` statement",
     $propdoc: {
@@ -303,10 +297,9 @@ var AST_With = DEFNODE("With", "expression", {
 
 /* -----[ scope and functions ]----- */
 
-var AST_Scope = DEFNODE("Scope", "directives variables functions uses_with uses_eval parent_scope enclosed cname", {
+var AST_Scope = DEFNODE("Scope", "variables functions uses_with uses_eval parent_scope enclosed cname", {
     $documentation: "Base class for all statements introducing a lexical scope",
     $propdoc: {
-        directives: "[string*/S] an array of directives declared in this scope",
         variables: "[Object/S] a map of name -> SymbolDef for all variables/functions defined in this scope",
         functions: "[Object/S] like `variables`, but only lists function declarations",
         uses_with: "[boolean/S] tells whether this scope uses the `with` statement",
@@ -315,12 +308,12 @@ var AST_Scope = DEFNODE("Scope", "directives variables functions uses_with uses_
         enclosed: "[SymbolDef*/S] a list of all symbol definitions that are accessed from this scope or any subscopes",
         cname: "[integer/S] current index for mangling variables (used internally by the mangler)",
     },
-    get_defun_scope: function () {
-        var self = this;
-        while (self.is_block_scope() && self.parent_scope) {
-            self = self.parent_scope;
-        }
-        return self;
+    clone: function(deep) {
+        var node = this._clone(deep);
+        if (this.variables) node.variables = this.variables.clone();
+        if (this.functions) node.functions = this.functions.clone();
+        if (this.enclosed) node.enclosed = this.enclosed.slice();
+        return node;
     }
 }, AST_Block);
 
@@ -342,38 +335,12 @@ var AST_Toplevel = DEFNODE("Toplevel", "globals", {
     }
 }, AST_Scope);
 
-var AST_Expansion = DEFNODE("Expansion", "expression", {
-    $documentation: "An expandible argument, such as ...rest, a splat, such as [1,2,...all], or an expansion in a variable declaration, such as var [first, ...rest] = list",
-    $propdoc: {
-        expression: "[AST_Node] the thing to be expanded"
-    },
-    _walk: function(visitor) {
-        var self = this;
-        return visitor._visit(this, function(){
-            self.expression.walk(visitor);
-        });
-    }
-});
-
-var AST_Lambda = DEFNODE("Lambda", "name argnames uses_arguments is_generator async", {
+var AST_Lambda = DEFNODE("Lambda", "name argnames uses_arguments", {
     $documentation: "Base class for functions",
     $propdoc: {
         name: "[AST_SymbolDeclaration?] the name of this function",
-        argnames: "[AST_SymbolFunarg|AST_Destructuring|AST_Expansion|AST_DefaultAssign*] array of function arguments, destructurings, or expanding arguments",
-        uses_arguments: "[boolean/S] tells whether this function accesses the arguments array",
-        is_generator: "[boolean] is this a generator method",
-        async: "[boolean] is this method async",
-    },
-    args_as_names: function () {
-        var out = [];
-        for (var i = 0; i < this.argnames.length; i++) {
-            if (this.argnames[i] instanceof AST_Destructuring) {
-                out = out.concat(this.argnames[i].all_symbols());
-            } else {
-                out.push(this.argnames[i]);
-            }
-        }
-        return out;
+        argnames: "[AST_SymbolFunarg*] array of function arguments",
+        uses_arguments: "[boolean/S] tells whether this function accesses the arguments array"
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
@@ -391,82 +358,14 @@ var AST_Accessor = DEFNODE("Accessor", null, {
     $documentation: "A setter/getter function.  The `name` property is always null."
 }, AST_Lambda);
 
-var AST_Function = DEFNODE("Function", null, {
+var AST_Function = DEFNODE("Function", "inlined", {
     $documentation: "A function expression"
 }, AST_Lambda);
 
-var AST_Arrow = DEFNODE("Arrow", null, {
-    $documentation: "An ES6 Arrow function ((a) => b)"
-}, AST_Lambda);
-
-var AST_Defun = DEFNODE("Defun", null, {
+var AST_Defun = DEFNODE("Defun", "inlined", {
     $documentation: "A function definition"
 }, AST_Lambda);
 
-/* -----[ DESTRUCTURING ]----- */
-var AST_Destructuring = DEFNODE("Destructuring", "names is_array", {
-    $documentation: "A destructuring of several names. Used in destructuring assignment and with destructuring function argument names",
-    $propdoc: {
-        "names": "[AST_Node*] Array of properties or elements",
-        "is_array": "[Boolean] Whether the destructuring represents an object or array"
-    },
-    _walk: function(visitor) {
-        return visitor._visit(this, function(){
-            this.names.forEach(function(name){
-                name._walk(visitor);
-            });
-        });
-    },
-    all_symbols: function() {
-        var out = [];
-        this.walk(new TreeWalker(function (node) {
-            if (node instanceof AST_Symbol) {
-                out.push(node);
-            }
-            if (node instanceof AST_Expansion) {
-                out.push(node.expression);
-            }
-        }));
-        return out;
-    }
-});
-
-var AST_PrefixedTemplateString = DEFNODE("PrefixedTemplateString", "template_string prefix", {
-    $documentation: "A templatestring with a prefix, such as String.raw`foobarbaz`",
-    $propdoc: {
-        template_string: "[AST_TemplateString] The template string",
-        prefix: "[AST_SymbolRef|AST_PropAccess] The prefix, which can be a symbol such as `foo` or a dotted expression such as `String.raw`."
-    },
-    _walk: function(visitor) {
-        this.prefix._walk(visitor);
-        this.template_string._walk(visitor);
-    }
-})
-
-var AST_TemplateString = DEFNODE("TemplateString", "segments", {
-    $documentation: "A template string literal",
-    $propdoc: {
-        segments: "[AST_Node*] One or more segments, starting with AST_TemplateSegment. AST_Node may follow AST_TemplateSegment, but each AST_Node must be followed by AST_TemplateSegment."
-    },
-    _walk: function(visitor) {
-        return visitor._visit(this, function(){
-            this.segments.forEach(function(seg, i){
-                if (i % 2 !== 0) {
-                    seg._walk(visitor);
-                }
-            });
-        });
-    }
-});
-
-var AST_TemplateSegment = DEFNODE("TemplateSegment", "value raw", {
-    $documentation: "A segment of a template string literal",
-    $propdoc: {
-        value: "Content of the segment",
-        raw: "Raw content of the segment"
-    }
-});
-
 /* -----[ JUMPS ]----- */
 
 var AST_Jump = DEFNODE("Jump", null, {
@@ -586,7 +485,7 @@ var AST_Try = DEFNODE("Try", "bcatch bfinally", {
 var AST_Catch = DEFNODE("Catch", "argname", {
     $documentation: "A `catch` node; only makes sense as part of a `try` statement",
     $propdoc: {
-        argname: "[AST_SymbolCatch|AST_Destructuring|AST_Expansion|AST_DefaultAssign] symbol for the exception"
+        argname: "[AST_SymbolCatch] symbol for the exception"
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
@@ -600,10 +499,10 @@ var AST_Finally = DEFNODE("Finally", null, {
     $documentation: "A `finally` node; only makes sense as part of a `try` statement"
 }, AST_Block);
 
-/* -----[ VAR/CONST ]----- */
+/* -----[ VAR ]----- */
 
 var AST_Definitions = DEFNODE("Definitions", "definitions", {
-    $documentation: "Base class for `var` or `const` nodes (variable declarations/initializations)",
+    $documentation: "Base class for `var` nodes (variable declarations/initializations)",
     $propdoc: {
         definitions: "[AST_VarDef*] array of variable definitions"
     },
@@ -621,83 +520,10 @@ var AST_Var = DEFNODE("Var", null, {
     $documentation: "A `var` statement"
 }, AST_Definitions);
 
-var AST_Let = DEFNODE("Let", null, {
-    $documentation: "A `let` statement"
-}, AST_Definitions);
-
-var AST_Const = DEFNODE("Const", null, {
-    $documentation: "A `const` statement"
-}, AST_Definitions);
-
-var AST_NameMapping = DEFNODE("NameMapping", "foreign_name name", {
-    $documentation: "The part of the export/import statement that declare names from a module.",
-    $propdoc: {
-        foreign_name: "[AST_SymbolExportForeign|AST_SymbolImportForeign] The name being exported/imported (as specified in the module)",
-        name: "[AST_SymbolExport|AST_SymbolImport] The name as it is visible to this module."
-    },
-    _walk: function (visitor) {
-        return visitor._visit(this, function() {
-            this.foreign_name._walk(visitor);
-            this.name._walk(visitor);
-        });
-    }
-})
-
-var AST_Import = DEFNODE("Import", "imported_name imported_names module_name", {
-    $documentation: "An `import` statement",
-    $propdoc: {
-        imported_name: "[AST_SymbolImport] The name of the variable holding the module's default export.",
-        imported_names: "[AST_NameMapping*] The names of non-default imported variables",
-        module_name: "[AST_String] String literal describing where this module came from",
-    },
-    _walk: function(visitor) {
-        return visitor._visit(this, function() {
-            if (this.imported_name) {
-                this.imported_name._walk(visitor);
-            }
-            if (this.imported_names) {
-                this.imported_names.forEach(function(name_import) {
-                    name_import._walk(visitor);
-                });
-            }
-            this.module_name._walk(visitor);
-        });
-    }
-});
-
-var AST_Export = DEFNODE("Export", "exported_definition exported_value is_default exported_names module_name", {
-    $documentation: "An `export` statement",
-    $propdoc: {
-        exported_definition: "[AST_Defun|AST_Definitions|AST_DefClass?] An exported definition",
-        exported_value: "[AST_Node?] An exported value",
-        exported_names: "[AST_NameMapping*?] List of exported names",
-        module_name: "[AST_String?] Name of the file to load exports from",
-        is_default: "[Boolean] Whether this is the default exported value of this module"
-    },
-    _walk: function (visitor) {
-        visitor._visit(this, function () {
-            if (this.exported_definition) {
-                this.exported_definition._walk(visitor);
-            }
-            if (this.exported_value) {
-                this.exported_value._walk(visitor);
-            }
-            if (this.exported_names) {
-                this.exported_names.forEach(function(name_export) {
-                    name_export._walk(visitor);
-                });
-            }
-            if (this.module_name) {
-                this.module_name._walk(visitor);
-            }
-        });
-    }
-}, AST_Statement);
-
 var AST_VarDef = DEFNODE("VarDef", "name value", {
     $documentation: "A variable declaration; only appears in a AST_Definitions node",
     $propdoc: {
-        name: "[AST_Destructuring|AST_SymbolConst|AST_SymbolLet|AST_SymbolVar] name of the variable",
+        name: "[AST_SymbolVar] name of the variable",
         value: "[AST_Node?] initializer, or null of there's no initializer"
     },
     _walk: function(visitor) {
@@ -828,10 +654,6 @@ var AST_Assign = DEFNODE("Assign", null, {
     $documentation: "An assignment expression — `a = b + 5`",
 }, AST_Binary);
 
-var AST_DefaultAssign = DEFNODE("DefaultAssign", null, {
-    $documentation: "A default assignment expression like in `(a = 3) => a`"
-}, AST_Binary);
-
 /* -----[ LITERALS ]----- */
 
 var AST_Array = DEFNODE("Array", "elements", {
@@ -867,13 +689,11 @@ var AST_Object = DEFNODE("Object", "properties", {
 var AST_ObjectProperty = DEFNODE("ObjectProperty", "key value", {
     $documentation: "Base class for literal object properties",
     $propdoc: {
-        key: "[string|AST_Node] the property name converted to a string for ObjectKeyVal. For setters, getters and computed property this is an arbitrary AST_Node",
-        value: "[AST_Node] property value.  For setters and getters this is an AST_Accessor."
+        key: "[string|AST_SymbolAccessor] property name. For ObjectKeyVal this is a string. For getters and setters this is an AST_SymbolAccessor.",
+        value: "[AST_Node] property value.  For getters and setters this is an AST_Accessor."
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
-            if (this.key instanceof AST_Node)
-                this.key._walk(visitor);
             this.value._walk(visitor);
         });
     }
@@ -886,95 +706,35 @@ var AST_ObjectKeyVal = DEFNODE("ObjectKeyVal", "quote", {
     }
 }, AST_ObjectProperty);
 
-var AST_ObjectSetter = DEFNODE("ObjectSetter", "quote static", {
-    $propdoc: {
-        quote: "[string|undefined] the original quote character, if any",
-        static: "[boolean] whether this is a static setter (classes only)"
-    },
+var AST_ObjectSetter = DEFNODE("ObjectSetter", null, {
     $documentation: "An object setter property",
 }, AST_ObjectProperty);
 
-var AST_ObjectGetter = DEFNODE("ObjectGetter", "quote static", {
-    $propdoc: {
-        quote: "[string|undefined] the original quote character, if any",
-        static: "[boolean] whether this is a static getter (classes only)"
-    },
+var AST_ObjectGetter = DEFNODE("ObjectGetter", null, {
     $documentation: "An object getter property",
 }, AST_ObjectProperty);
 
-var AST_ConciseMethod = DEFNODE("ConciseMethod", "quote static is_generator async", {
-    $propdoc: {
-        quote: "[string|undefined] the original quote character, if any",
-        static: "[boolean] is this method static (classes only)",
-        is_generator: "[boolean] is this a generator method",
-        async: "[boolean] is this method async",
-    },
-    $documentation: "An ES6 concise method inside an object or class"
-}, AST_ObjectProperty);
-
-var AST_Class = DEFNODE("Class", "name extends properties", {
-    $propdoc: {
-        name: "[AST_SymbolClass|AST_SymbolDefClass?] optional class name.",
-        extends: "[AST_Node]? optional parent class",
-        properties: "[AST_ObjectProperty*] array of properties"
-    },
-    $documentation: "An ES6 class",
-    _walk: function(visitor) {
-        return visitor._visit(this, function(){
-            if (this.name) {
-                this.name._walk(visitor);
-            }
-            if (this.extends) {
-                this.extends._walk(visitor);
-            }
-            this.properties.forEach(function(prop){
-                prop._walk(visitor);
-            });
-        });
-    },
-}, AST_Scope);
-
-var AST_DefClass = DEFNODE("DefClass", null, {
-    $documentation: "A class definition",
-}, AST_Class);
-
-var AST_ClassExpression = DEFNODE("ClassExpression", null, {
-    $documentation: "A class expression."
-}, AST_Class);
-
 var AST_Symbol = DEFNODE("Symbol", "scope name thedef", {
     $propdoc: {
         name: "[string] name of this symbol",
         scope: "[AST_Scope/S] the current scope (not necessarily the definition scope)",
         thedef: "[SymbolDef/S] the definition of this symbol"
     },
-    $documentation: "Base class for all symbols"
+    $documentation: "Base class for all symbols",
 });
 
-var AST_NewTarget = DEFNODE("NewTarget", null, {
-    $documentation: "A reference to new.target"
-});
+var AST_SymbolAccessor = DEFNODE("SymbolAccessor", null, {
+    $documentation: "The name of a property accessor (setter/getter function)"
+}, AST_Symbol);
 
 var AST_SymbolDeclaration = DEFNODE("SymbolDeclaration", "init", {
-    $documentation: "A declaration symbol (symbol in var/const, function name or argument, symbol in catch)",
+    $documentation: "A declaration symbol (symbol in var, function name or argument, symbol in catch)",
 }, AST_Symbol);
 
 var AST_SymbolVar = DEFNODE("SymbolVar", null, {
     $documentation: "Symbol defining a variable",
 }, AST_SymbolDeclaration);
 
-var AST_SymbolBlockDeclaration = DEFNODE("SymbolBlockDeclaration", null, {
-    $documentation: "Base class for block-scoped declaration symbols"
-}, AST_SymbolDeclaration);
-
-var AST_SymbolConst = DEFNODE("SymbolConst", null, {
-    $documentation: "A constant declaration"
-}, AST_SymbolBlockDeclaration);
-
-var AST_SymbolLet = DEFNODE("SymbolLet", null, {
-    $documentation: "A block-scoped `let` declaration"
-}, AST_SymbolBlockDeclaration);
-
 var AST_SymbolFunarg = DEFNODE("SymbolFunarg", null, {
     $documentation: "Symbol naming a function argument",
 }, AST_SymbolVar);
@@ -983,33 +743,13 @@ var AST_SymbolDefun = DEFNODE("SymbolDefun", null, {
     $documentation: "Symbol defining a function",
 }, AST_SymbolDeclaration);
 
-var AST_SymbolMethod = DEFNODE("SymbolMethod", null, {
-    $documentation: "Symbol in an object defining a method",
-}, AST_Symbol);
-
 var AST_SymbolLambda = DEFNODE("SymbolLambda", null, {
     $documentation: "Symbol naming a function expression",
 }, AST_SymbolDeclaration);
 
-var AST_SymbolDefClass = DEFNODE("SymbolDefClass", null, {
-    $documentation: "Symbol naming a class's name in a class declaration. Lexically scoped to its containing scope, and accessible within the class."
-}, AST_SymbolBlockDeclaration);
-
-var AST_SymbolClass = DEFNODE("SymbolClass", null, {
-    $documentation: "Symbol naming a class's name. Lexically scoped to the class."
-}, AST_SymbolDeclaration);
-
 var AST_SymbolCatch = DEFNODE("SymbolCatch", null, {
     $documentation: "Symbol naming the exception in catch",
-}, AST_SymbolBlockDeclaration);
-
-var AST_SymbolImport = DEFNODE("SymbolImport", null, {
-    $documentation: "Symbol referring to an imported name",
-}, AST_SymbolBlockDeclaration);
-
-var AST_SymbolImportForeign = DEFNODE("SymbolImportForeign", null, {
-    $documentation: "A symbol imported from a module, but it is defined in the other module, and its real name is irrelevant for this module's purposes",
-}, AST_Symbol);
+}, AST_SymbolDeclaration);
 
 var AST_Label = DEFNODE("Label", "references", {
     $documentation: "Symbol naming a label (declaration)",
@@ -1026,14 +766,6 @@ var AST_SymbolRef = DEFNODE("SymbolRef", null, {
     $documentation: "Reference to some symbol (not definition/declaration)",
 }, AST_Symbol);
 
-var AST_SymbolExport = DEFNODE("SymbolExport", null, {
-    $documentation: "Symbol referring to a name to export",
-}, AST_SymbolRef);
-
-var AST_SymbolExportForeign = DEFNODE("SymbolExportForeign", null, {
-    $documentation: "A symbol exported from this module, but it is used in the other module, and its real name is irrelevant for this module's purposes",
-}, AST_Symbol);
-
 var AST_LabelRef = DEFNODE("LabelRef", null, {
     $documentation: "Reference to a label symbol",
 }, AST_Symbol);
@@ -1042,10 +774,6 @@ var AST_This = DEFNODE("This", null, {
     $documentation: "The `this` symbol",
 }, AST_Symbol);
 
-var AST_Super = DEFNODE("Super", null, {
-    $documentation: "The `super` symbol",
-}, AST_Symbol);
-
 var AST_Constant = DEFNODE("Constant", null, {
     $documentation: "Base class for all constants",
     getValue: function() {
@@ -1119,31 +847,6 @@ var AST_True = DEFNODE("True", null, {
     value: true
 }, AST_Boolean);
 
-var AST_Await = DEFNODE("Await", "expression", {
-    $documentation: "An `await` statement",
-    $propdoc: {
-        expression: "[AST_Node] the mandatory expression being awaited",
-    },
-    _walk: function(visitor) {
-        return visitor._visit(this, function(){
-            this.expression._walk(visitor);
-        });
-    }
-});
-
-var AST_Yield = DEFNODE("Yield", "expression is_star", {
-    $documentation: "A `yield` statement",
-    $propdoc: {
-        expression: "[AST_Node?] the value returned or thrown by this statement; could be null (representing undefined) but only when is_star is set to false",
-        is_star: "[Boolean] Whether this is a yield or yield* statement"
-    },
-    _walk: function(visitor) {
-        return visitor._visit(this, this.expression && function(){
-            this.expression._walk(visitor);
-        });
-    }
-});
-
 /* -----[ TreeWalker ]----- */
 
 function TreeWalker(callback) {
@@ -1171,17 +874,11 @@ TreeWalker.prototype = {
             this.directives = Object.create(this.directives);
         } else if (node instanceof AST_Directive && !this.directives[node.value]) {
             this.directives[node.value] = node;
-        } else if (node instanceof AST_Class) {
-            this.directives = Object.create(this.directives);
-            if (!this.directives["use strict"]) {
-                this.directives["use strict"] = node;
-            }
         }
         this.stack.push(node);
     },
     pop: function() {
-        var node = this.stack.pop();
-        if (node instanceof AST_Lambda || node instanceof AST_Class) {
+        if (this.stack.pop() instanceof AST_Lambda) {
             this.directives = Object.getPrototypeOf(this.directives);
         }
     },
@@ -1199,7 +896,7 @@ TreeWalker.prototype = {
         var dir = this.directives[type];
         if (dir) return dir;
         var node = this.stack[this.stack.length - 1];
-        if (node instanceof AST_Scope && node.body) {
+        if (node instanceof AST_Scope) {
             for (var i = 0; i < node.body.length; ++i) {
                 var st = node.body[i];
                 if (!(st instanceof AST_Directive)) break;
@@ -1207,24 +904,6 @@ TreeWalker.prototype = {
             }
         }
     },
-    in_boolean_context: function() {
-        var stack = this.stack;
-        var i = stack.length, self = stack[--i];
-        while (i > 0) {
-            var p = stack[--i];
-            if ((p instanceof AST_If           && p.condition === self) ||
-                (p instanceof AST_Conditional  && p.condition === self) ||
-                (p instanceof AST_DWLoop       && p.condition === self) ||
-                (p instanceof AST_For          && p.condition === self) ||
-                (p instanceof AST_UnaryPrefix  && p.operator == "!" && p.expression === self))
-            {
-                return true;
-            }
-            if (!(p instanceof AST_Binary && (p.operator == "&&" || p.operator == "||")))
-                return false;
-            self = p;
-        }
-    },
     loopcontrol_target: function(node) {
         var stack = this.stack;
         if (node.label) for (var i = stack.length; --i >= 0;) {

lib/minify.js

@@ -29,7 +29,6 @@ function set_shorthand(name, options, keys) {
 
 function init_cache(cache) {
     if (!cache) return;
-    if (!("cname" in cache)) cache.cname = -1;
     if (!("props" in cache)) {
         cache.props = new Dictionary();
     } else if (!(cache.props instanceof Dictionary)) {
@@ -39,7 +38,6 @@ function init_cache(cache) {
 
 function to_json(cache) {
     return {
-        cname: cache.cname,
         props: cache.props.toObject()
     };
 }
@@ -49,13 +47,13 @@ function minify(files, options) {
     try {
         options = defaults(options, {
             compress: {},
-            ecma: undefined,
             ie8: false,
             keep_fnames: false,
             mangle: {},
             nameCache: null,
             output: {},
             parse: {},
+            rename: undefined,
             sourceMap: false,
             timings: false,
             toplevel: false,
@@ -65,7 +63,9 @@ function minify(files, options) {
         var timings = options.timings && {
             start: Date.now()
         };
-        set_shorthand("ecma", options, [ "parse", "compress", "output" ]);
+        if (options.rename === undefined) {
+            options.rename = options.compress && options.mangle;
+        }
         set_shorthand("ie8", options, [ "compress", "mangle", "output" ]);
         set_shorthand("keep_fnames", options, [ "compress", "mangle" ]);
         set_shorthand("toplevel", options, [ "compress", "mangle" ]);
@@ -76,11 +76,9 @@ function minify(files, options) {
                 cache: options.nameCache && (options.nameCache.vars || {}),
                 eval: false,
                 ie8: false,
-                keep_classnames: false,
                 keep_fnames: false,
                 properties: false,
                 reserved: [],
-                safari10: false,
                 toplevel: false,
             }, true);
             if (options.mangle.properties) {
@@ -141,11 +139,14 @@ function minify(files, options) {
         if (options.wrap) {
             toplevel = toplevel.wrap_commonjs(options.wrap);
         }
-        if (timings) timings.scope1 = Date.now();
-        if (options.compress) toplevel.figure_out_scope(options.mangle);
+        if (timings) timings.rename = Date.now();
+        if (options.rename) {
+            toplevel.figure_out_scope(options.mangle);
+            toplevel.expand_names(options.mangle);
+        }
         if (timings) timings.compress = Date.now();
         if (options.compress) toplevel = new Compressor(options.compress).compress(toplevel);
-        if (timings) timings.scope2 = Date.now();
+        if (timings) timings.scope = Date.now();
         if (options.mangle) toplevel.figure_out_scope(options.mangle);
         if (timings) timings.mangle = Date.now();
         if (options.mangle) {
@@ -203,9 +204,10 @@ 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),
+                parse: 1e-3 * (timings.rename - timings.parse),
+                rename: 1e-3 * (timings.compress - timings.rename),
+                compress: 1e-3 * (timings.scope - timings.compress),
+                scope: 1e-3 * (timings.mangle - timings.scope),
                 mangle: 1e-3 * (timings.properties - timings.mangle),
                 properties: 1e-3 * (timings.output - timings.properties),
                 output: 1e-3 * (timings.end - timings.output),

lib/mozilla-ast.js

@@ -118,7 +118,7 @@
                 value    : from_moz(M.value)
             };
             if (M.kind == "init") return new AST_ObjectKeyVal(args);
-            args.key = new AST_SymbolMethod({
+            args.key = new AST_SymbolAccessor({
                 name: args.key
             });
             args.value = new AST_Accessor(args.value);
@@ -168,7 +168,7 @@
             });
         },
         VariableDeclaration: function(M) {
-            return new (M.kind === "const" ? AST_Const : AST_Var)({
+            return new AST_Var({
                 start       : my_start_token(M),
                 end         : my_end_token(M),
                 definitions : M.declarations.map(from_moz)
@@ -204,7 +204,7 @@
         Identifier: function(M) {
             var p = FROM_MOZ_STACK[FROM_MOZ_STACK.length - 2];
             return new (  p.type == "LabeledStatement" ? AST_Label
-                        : p.type == "VariableDeclarator" && p.id === M ? (p.kind == "const" ? AST_SymbolConst : AST_SymbolVar)
+                        : p.type == "VariableDeclarator" && p.id === M ? AST_SymbolVar
                         : p.type == "FunctionExpression" ? (p.id === M ? AST_SymbolLambda : AST_SymbolFunarg)
                         : p.type == "FunctionDeclaration" ? (p.id === M ? AST_SymbolDefun : AST_SymbolFunarg)
                         : p.type == "CatchClause" ? AST_SymbolCatch
@@ -324,7 +324,7 @@
     def_to_moz(AST_Definitions, function To_Moz_VariableDeclaration(M) {
         return {
             type: "VariableDeclaration",
-            kind: M instanceof AST_Const ? "const" : "var",
+            kind: "var",
             declarations: M.definitions.map(to_moz)
         };
     });
@@ -381,7 +381,7 @@
     def_to_moz(AST_ObjectProperty, function To_Moz_Property(M) {
         var key = {
             type: "Literal",
-            value: M.key instanceof AST_SymbolMethod ? M.key.name : M.key
+            value: M.key instanceof AST_SymbolAccessor ? M.key.name : M.key
         };
         var kind;
         if (M instanceof AST_ObjectKeyVal) {

lib/output.js

@@ -52,12 +52,12 @@ function is_some_comments(comment) {
 
 function OutputStream(options) {
 
+    var readonly = !options;
     options = defaults(options, {
         ascii_only       : false,
         beautify         : false,
         bracketize       : false,
         comments         : false,
-        ecma             : 5,
         ie8              : false,
         indent_level     : 4,
         indent_start     : 0,
@@ -70,16 +70,12 @@ function OutputStream(options) {
         quote_style      : 0,
         semicolons       : true,
         shebang          : true,
-        shorthand        : undefined,
         source_map       : null,
         webkit           : false,
         width            : 80,
         wrap_iife        : false,
     }, true);
 
-    if (options.shorthand === undefined)
-        options.shorthand = options.ecma > 5;
-
     // Convert comment option to RegExp if neccessary and set up comments filter
     var comment_filter = return_false; // Default case, throw all comments away
     if (options.comments) {
@@ -115,12 +111,6 @@ function OutputStream(options) {
     var OUTPUT = "";
 
     var to_utf8 = options.ascii_only ? function(str, identifier) {
-        if (options.ecma >= 6) {
-            str = str.replace(/[\ud800-\udbff][\udc00-\udfff]/g, function(ch) {
-                var code = get_full_char_code(ch, 0).toString(16);
-                return "\\u{" + code + "}";
-            });
-        }
         return str.replace(/[\u0000-\u001f\u007f-\uffff]/g, function(ch) {
             var code = ch.charCodeAt(0).toString(16);
             if (code.length <= 2 && !identifier) {
@@ -132,11 +122,16 @@ function OutputStream(options) {
             }
         });
     } : function(str) {
-        return str.replace(/[\ud800-\udbff](?![\udc00-\udfff])/g, function(ch) {
-            return "\\u" + ch.charCodeAt(0).toString(16);
-        }).replace(/(^|[^\ud800-\udbff])([\udc00-\udfff])/g, function(match, prefix, ch) {
-            return prefix + "\\u" + ch.charCodeAt(0).toString(16);
-        });
+        var s = "";
+        for (var i = 0, len = str.length; i < len; i++) {
+            if (is_surrogate_pair_head(str[i]) && !is_surrogate_pair_tail(str[i + 1])
+                || is_surrogate_pair_tail(str[i]) && !is_surrogate_pair_head(str[i - 1])) {
+                s += "\\u" + str.charCodeAt(i).toString(16);
+            } else {
+                s += str[i];
+            }
+        }
+        return s;
     };
 
     function make_string(str, quote) {
@@ -157,7 +152,7 @@ function OutputStream(options) {
               case "\u2029": return "\\u2029";
               case "\ufeff": return "\\ufeff";
               case "\0":
-                  return /[0-9]/.test(get_full_char(str, i+1)) ? "\\x00" : "\\0";
+                  return /[0-9]/.test(str.charAt(i+1)) ? "\\x00" : "\\0";
             }
             return s;
         });
@@ -167,11 +162,7 @@ function OutputStream(options) {
         function quote_double() {
             return '"' + str.replace(/\x22/g, '\\"') + '"';
         }
-        function quote_template() {
-            return '`' + str.replace(/`/g, '\\`') + '`';
-        }
         str = to_utf8(str);
-        if (quote === "`") return quote_template();
         switch (options.quote_style) {
           case 1:
             return quote_single();
@@ -209,6 +200,9 @@ function OutputStream(options) {
     var might_need_space = false;
     var might_need_semicolon = false;
     var might_add_newline = 0;
+    var need_newline_indented = false;
+    var need_space = false;
+    var newline_insert = -1;
     var last = "";
     var mapping_token, mapping_name, mappings = options.source_map && [];
 
@@ -266,8 +260,22 @@ function OutputStream(options) {
 
     function print(str) {
         str = String(str);
-        var ch = get_full_char(str, 0);
-        var prev = get_full_char(last, last.length - 1);
+        var ch = str.charAt(0);
+        if (need_newline_indented && ch) {
+            need_newline_indented = false;
+            if (ch != "\n") {
+                print("\n");
+                indent();
+            }
+        }
+        if (need_space && ch) {
+            need_space = false;
+            if (!/[\s;})]/.test(ch)) {
+                space();
+            }
+        }
+        newline_insert = -1;
+        var prev = last.charAt(last.length - 1);
         if (might_need_semicolon) {
             might_need_semicolon = false;
 
@@ -343,10 +351,6 @@ function OutputStream(options) {
         last = str;
     };
 
-    var star = function(){
-        print("*");
-    }
-
     var space = options.beautify ? function() {
         print(" ");
     } : function() {
@@ -369,7 +373,13 @@ function OutputStream(options) {
     } : function(col, cont) { return cont() };
 
     var newline = options.beautify ? function() {
-        print("\n");
+        if (newline_insert < 0) return print("\n");
+        if (OUTPUT[newline_insert] != "\n") {
+            OUTPUT = OUTPUT.slice(0, newline_insert) + "\n" + OUTPUT.slice(newline_insert);
+            current_pos++;
+            current_line++;
+        }
+        newline_insert++;
     } : options.max_line_len ? function() {
         ensure_line_len();
         might_add_newline = OUTPUT.length;
@@ -441,6 +451,123 @@ function OutputStream(options) {
         return OUTPUT;
     };
 
+    function has_nlb() {
+        var index = OUTPUT.lastIndexOf("\n");
+        return /^ *$/.test(OUTPUT.slice(index + 1));
+    }
+
+    function prepend_comments(node) {
+        var self = this;
+        var start = node.start;
+        if (!start) return;
+        if (start.comments_before && start.comments_before._dumped === self) return;
+        var comments = start.comments_before;
+        if (!comments) {
+            comments = start.comments_before = [];
+        }
+        comments._dumped = self;
+
+        if (node instanceof AST_Exit && node.value) {
+            var tw = new TreeWalker(function(node) {
+                var parent = tw.parent();
+                if (parent instanceof AST_Exit
+                    || parent instanceof AST_Binary && parent.left === node
+                    || parent.TYPE == "Call" && parent.expression === node
+                    || parent instanceof AST_Conditional && parent.condition === node
+                    || parent instanceof AST_Dot && parent.expression === node
+                    || parent instanceof AST_Sequence && parent.expressions[0] === node
+                    || parent instanceof AST_Sub && parent.expression === node
+                    || parent instanceof AST_UnaryPostfix) {
+                    var text = node.start.comments_before;
+                    if (text && text._dumped !== self) {
+                        text._dumped = self;
+                        comments = comments.concat(text);
+                    }
+                } else {
+                    return true;
+                }
+            });
+            tw.push(node);
+            node.value.walk(tw);
+        }
+
+        if (current_pos == 0) {
+            if (comments.length > 0 && options.shebang && comments[0].type == "comment5") {
+                print("#!" + comments.shift().value + "\n");
+                indent();
+            }
+            var preamble = options.preamble;
+            if (preamble) {
+                print(preamble.replace(/\r\n?|[\n\u2028\u2029]|\s*$/g, "\n"));
+            }
+        }
+
+        comments = comments.filter(comment_filter, node);
+        if (comments.length == 0) return;
+        var last_nlb = has_nlb();
+        comments.forEach(function(c, i) {
+            if (!last_nlb) {
+                if (c.nlb) {
+                    print("\n");
+                    indent();
+                    last_nlb = true;
+                } else if (i > 0) {
+                    space();
+                }
+            }
+            if (/comment[134]/.test(c.type)) {
+                print("//" + c.value.replace(/[@#]__PURE__/g, ' ') + "\n");
+                indent();
+                last_nlb = true;
+            } else if (c.type == "comment2") {
+                print("/*" + c.value.replace(/[@#]__PURE__/g, ' ') + "*/");
+                last_nlb = false;
+            }
+        });
+        if (!last_nlb) {
+            if (start.nlb) {
+                print("\n");
+                indent();
+            } else {
+                space();
+            }
+        }
+    }
+
+    function append_comments(node, tail) {
+        var self = this;
+        var token = node.end;
+        if (!token) return;
+        var comments = token[tail ? "comments_before" : "comments_after"];
+        if (!comments || comments._dumped === self) return;
+        if (!(node instanceof AST_Statement || all(comments, function(c) {
+            return !/comment[134]/.test(c.type);
+        }))) return;
+        comments._dumped = self;
+        var insert = OUTPUT.length;
+        comments.filter(comment_filter, node).forEach(function(c, i) {
+            need_space = false;
+            if (need_newline_indented) {
+                print("\n");
+                indent();
+                need_newline_indented = false;
+            } else if (c.nlb && (i > 0 || !has_nlb())) {
+                print("\n");
+                indent();
+            } else if (i > 0 || !tail) {
+                space();
+            }
+            if (/comment[134]/.test(c.type)) {
+                print("//" + c.value.replace(/[@#]__PURE__/g, ' '));
+                need_newline_indented = true;
+            } else if (c.type == "comment2") {
+                print("/*" + c.value.replace(/[@#]__PURE__/g, ' ') + "*/");
+                need_space = true;
+            }
+        });
+        if (OUTPUT.length > insert) newline_insert = insert;
+    }
+
     var stack = [];
     return {
         get             : get,
@@ -451,7 +578,6 @@ function OutputStream(options) {
         should_break    : function() { return options.width && this.current_width() >= options.width },
         newline         : newline,
         print           : print,
-        star            : star,
         space           : space,
         comma           : comma,
         colon           : colon,
@@ -471,10 +597,6 @@ function OutputStream(options) {
             }
             print(encoded);
         },
-        print_template_string_chars: function(str) {
-            var encoded = encode_string(str, '`').replace(/\${/g, "\\${");
-            return print(encoded.substr(1, encoded.length - 2));
-        },
         encode_string   : encode_string,
         next_indent     : next_indent,
         with_indent     : with_indent,
@@ -483,7 +605,8 @@ function OutputStream(options) {
         with_square     : with_square,
         add_mapping     : add_mapping,
         option          : function(opt) { return options[opt] },
-        comment_filter  : comment_filter,
+        prepend_comments: readonly ? noop : prepend_comments,
+        append_comments : readonly || comment_filter === return_false ? noop : append_comments,
         line            : function() { return current_line },
         col             : function() { return current_col },
         pos             : function() { return current_pos },
@@ -506,18 +629,23 @@ function OutputStream(options) {
         nodetype.DEFMETHOD("_codegen", generator);
     };
 
-    var use_asm = false;
     var in_directive = false;
+    var active_scope = null;
+    var use_asm = null;
 
     AST_Node.DEFMETHOD("print", function(stream, force_parens){
-        var self = this, generator = self._codegen, prev_use_asm = use_asm;
-        if (self instanceof AST_Directive && self.value == "use asm" && stream.parent() instanceof AST_Scope) {
-            use_asm = true;
+        var self = this, generator = self._codegen;
+        if (self instanceof AST_Scope) {
+            active_scope = self;
+        }
+        else if (!use_asm && self instanceof AST_Directive && self.value == "use asm") {
+            use_asm = active_scope;
         }
         function doit() {
-            self.add_comments(stream);
+            stream.prepend_comments(self);
             self.add_source_map(stream);
             generator(self, stream);
+            stream.append_comments(self);
         }
         stream.push_node(self);
         if (force_parens || self.needs_parens(stream)) {
@@ -526,85 +654,18 @@ function OutputStream(options) {
             doit();
         }
         stream.pop_node();
-        if (self instanceof AST_Scope) {
-            use_asm = prev_use_asm;
+        if (self === use_asm) {
+            use_asm = null;
         }
     });
     AST_Node.DEFMETHOD("_print", AST_Node.prototype.print);
 
     AST_Node.DEFMETHOD("print_to_string", function(options){
         var s = OutputStream(options);
-        if (!options) s._readonly = true;
         this.print(s);
         return s.get();
     });
 
-    /* -----[ comments ]----- */
-
-    AST_Node.DEFMETHOD("add_comments", function(output){
-        if (output._readonly) return;
-        var self = this;
-        var start = self.start;
-        if (start && !start._comments_dumped) {
-            start._comments_dumped = true;
-            var comments = start.comments_before || [];
-
-            // XXX: ugly fix for https://github.com/mishoo/UglifyJS2/issues/112
-            //               and https://github.com/mishoo/UglifyJS2/issues/372
-            if (self instanceof AST_Exit && self.value) {
-                self.value.walk(new TreeWalker(function(node){
-                    if (node.start && node.start.comments_before) {
-                        comments = comments.concat(node.start.comments_before);
-                        node.start.comments_before = [];
-                    }
-                    if (node instanceof AST_Function ||
-                        node instanceof AST_Array ||
-                        node instanceof AST_Object)
-                    {
-                        return true; // don't go inside.
-                    }
-                }));
-            }
-
-            if (output.pos() == 0) {
-                if (comments.length > 0 && output.option("shebang") && comments[0].type == "comment5") {
-                    output.print("#!" + comments.shift().value + "\n");
-                    output.indent();
-                }
-                var preamble = output.option("preamble");
-                if (preamble) {
-                    output.print(preamble.replace(/\r\n?|[\n\u2028\u2029]|\s*$/g, "\n"));
-                }
-            }
-
-            comments = comments.filter(output.comment_filter, self);
-
-            // Keep single line comments after nlb, after nlb
-            if (!output.option("beautify") && comments.length > 0 &&
-                /comment[134]/.test(comments[0].type) &&
-                output.col() !== 0 && comments[0].nlb)
-            {
-                output.print("\n");
-            }
-
-            comments.forEach(function(c){
-                if (/comment[134]/.test(c.type)) {
-                    output.print("//" + c.value + "\n");
-                    output.indent();
-                }
-                else if (c.type == "comment2") {
-                    output.print("/*" + c.value + "*/");
-                    if (start.nlb) {
-                        output.print("\n");
-                        output.indent();
-                    } else {
-                        output.space();
-                    }
-                }
-            });
-        }
-    });
-
     /* -----[ PARENTHESES ]----- */
 
     function PARENS(nodetype, func) {
@@ -617,9 +678,7 @@ function OutputStream(options) {
         }
     };
 
-    PARENS(AST_Node, function(){
-        return false;
-    });
+    PARENS(AST_Node, return_false);
 
     // a function expression needs parens around it when it's provably
     // the first token to appear in a statement.
@@ -643,34 +702,11 @@ function OutputStream(options) {
         return false;
     });
 
-    PARENS(AST_Arrow, function(output){
-        var p = output.parent();
-        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){
-        return first_in_statement(output);
-    });
+    PARENS(AST_Object, first_in_statement);
 
     PARENS(AST_Unary, function(output){
-        var p = output.parent();
-        return p instanceof AST_PropAccess && p.expression === this
-            || p instanceof AST_Call && p.expression === this
-            || p instanceof AST_Binary
-                && p.operator === "**"
-                && this instanceof AST_UnaryPrefix
-                && p.left === this
-                && this.operator !== "++"
-                && this.operator !== "--";
-    });
-
-    PARENS(AST_Await, function(output){
         var p = output.parent();
         return p instanceof AST_PropAccess && p.expression === this
             || p instanceof AST_Call && p.expression === this;
@@ -678,18 +714,15 @@ function OutputStream(options) {
 
     PARENS(AST_Sequence, function(output){
         var p = output.parent();
-        return p instanceof AST_Call                          // (foo, bar)() or foo(1, (2, 3), 4)
-            || p instanceof AST_Unary                         // !(foo, bar, baz)
-            || p instanceof AST_Binary                        // 1 + (2, 3) + 4 ==> 8
-            || p instanceof AST_VarDef                        // var a = (1, 2), b = a + a; ==> b == 4
-            || p instanceof AST_PropAccess                    // (1, {foo:2}).foo or (1, {foo:2})["foo"] ==> 2
-            || p instanceof AST_Array                         // [ 1, (2, 3), 4 ] ==> [ 1, 3, 4 ]
-            || p instanceof AST_ObjectProperty                // { foo: (1, 2) }.foo ==> 2
-            || p instanceof AST_Conditional                   /* (false, true) ? (a = 10, b = 20) : (c = 30)
-                                                               * ==> 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_Expansion                     // [...(a, b)]
+        return p instanceof AST_Call             // (foo, bar)() or foo(1, (2, 3), 4)
+            || p instanceof AST_Unary            // !(foo, bar, baz)
+            || p instanceof AST_Binary           // 1 + (2, 3) + 4 ==> 8
+            || p instanceof AST_VarDef           // var a = (1, 2), b = a + a; ==> b == 4
+            || p instanceof AST_PropAccess       // (1, {foo:2}).foo or (1, {foo:2})["foo"] ==> 2
+            || p instanceof AST_Array            // [ 1, (2, 3), 4 ] ==> [ 1, 3, 4 ]
+            || p instanceof AST_ObjectProperty   // { foo: (1, 2) }.foo ==> 2
+            || p instanceof AST_Conditional      /* (false, true) ? (a = 10, b = 20) : (c = 30)
+                                                  * ==> 20 (side effect, set a := 10 and b := 20) */
         ;
     });
 
@@ -716,24 +749,6 @@ function OutputStream(options) {
         }
     });
 
-    PARENS(AST_Yield, function(output){
-        var p = output.parent();
-        // (yield 1) + (yield 2)
-        // a = yield 3
-        if (p instanceof AST_Binary && p.operator !== "=")
-            return true;
-        // (yield 1) ? yield 2 : yield 3
-        if (p instanceof AST_Conditional && p.condition === this)
-            return true;
-        // -(yield 4)
-        if (p instanceof AST_Unary)
-            return true;
-        // (yield x).foo
-        // (yield x)['foo']
-        if (p instanceof AST_PropAccess && p.expression === this)
-            return true;
-    });
-
     PARENS(AST_PropAccess, function(output){
         var p = output.parent();
         if (p instanceof AST_New && p.expression === this) {
@@ -804,9 +819,6 @@ function OutputStream(options) {
         // (a = foo)["prop"] —or— (a = foo).prop
         if (p instanceof AST_PropAccess && p.expression === this)
             return true;
-        // ({a, b} = {a: 1, b: 2}), a destructuring assignment
-        if (this instanceof AST_Assign && this.left instanceof AST_Destructuring && this.left.is_array === false)
-            return true;
     });
 
     /* -----[ PRINTERS ]----- */
@@ -815,26 +827,6 @@ function OutputStream(options) {
         output.print_string(self.value, self.quote);
         output.semicolon();
     });
-
-    DEFPRINT(AST_Expansion, function (self, output) {
-        output.print('...');
-        self.expression.print(output);
-    });
-
-    DEFPRINT(AST_Destructuring, function (self, output) {
-        output.print(self.is_array ? "[" : "{");
-        var len = self.names.length;
-        self.names.forEach(function (name, i) {
-            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) output.comma();
-        });
-        output.print(self.is_array ? "]" : "}");
-    });
-
     DEFPRINT(AST_Debugger, function(self, output){
         output.print("debugger");
         output.semicolon();
@@ -891,14 +883,21 @@ function OutputStream(options) {
         self.body.print(output);
         output.semicolon();
     });
-    function print_bracketed(body, output, allow_directives) {
-        if (body.length > 0) output.with_block(function(){
-            display_body(body, false, output, allow_directives);
-        });
-        else output.print("{}");
+    function print_bracketed(self, output, allow_directives) {
+        if (self.body.length > 0) {
+            output.with_block(function() {
+                display_body(self.body, false, output, allow_directives);
+            });
+        } else {
+            output.print("{");
+            output.with_indent(output.next_indent(), function() {
+                output.append_comments(self, true);
+            });
+            output.print("}");
+        }
     };
     DEFPRINT(AST_BlockStatement, function(self, output){
-        print_bracketed(self.body, output);
+        print_bracketed(self, output);
     });
     DEFPRINT(AST_EmptyStatement, function(self, output){
         output.semicolon();
@@ -959,11 +958,7 @@ function OutputStream(options) {
         output.with_parens(function(){
             self.init.print(output);
             output.space();
-            if (self instanceof AST_ForOf) {
-                output.print("of");
-            } else {
-                output.print("in");
-            }
+            output.print("in");
             output.space();
             self.object.print(output);
         });
@@ -984,24 +979,11 @@ function OutputStream(options) {
     AST_Lambda.DEFMETHOD("_do_print", function(output, nokeyword){
         var self = this;
         if (!nokeyword) {
-            if (self.async) {
-                output.print("async");
-                output.space();
-            }
             output.print("function");
-            if (self.is_generator) {
-                output.star();
-            }
-            if (self.name) {
-                output.space();
-            }
         }
-        if (self.name instanceof AST_Symbol) {
+        if (self.name) {
+            output.space();
             self.name.print(output);
-        } else if (nokeyword && self.name instanceof AST_Node) {
-            output.with_square(function() {
-                self.name.print(output); // Computed method name
-            });
         }
         output.with_parens(function(){
             self.argnames.forEach(function(arg, i){
@@ -1010,66 +992,12 @@ function OutputStream(options) {
             });
         });
         output.space();
-        print_bracketed(self.body, output, true);
+        print_bracketed(self, output, true);
     });
     DEFPRINT(AST_Lambda, function(self, output){
         self._do_print(output);
     });
 
-    DEFPRINT(AST_PrefixedTemplateString, function(self, output) {
-        self.prefix.print(output);
-        self.template_string.print(output);
-    });
-    DEFPRINT(AST_TemplateString, function(self, output) {
-        var is_tagged = output.parent() instanceof AST_PrefixedTemplateString;
-
-        output.print("`");
-        for (var i = 0; i < self.segments.length; i++) {
-            if (!(self.segments[i] instanceof AST_TemplateSegment)) {
-                output.print("${");
-                self.segments[i].print(output);
-                output.print("}");
-            } else if (is_tagged) {
-                output.print(self.segments[i].raw);
-            } else {
-                output.print_template_string_chars(self.segments[i].value);
-            }
-        }
-        output.print("`");
-    });
-
-    AST_Arrow.DEFMETHOD("_do_print", function(output){
-        var self = this;
-        var parent = output.parent();
-        var needs_parens = parent instanceof AST_Binary ||
-            parent instanceof AST_Unary ||
-            (parent instanceof AST_Call && self === parent.expression);
-        if (needs_parens) { output.print("(") }
-        if (self.async) {
-            output.print("async");
-            output.space();
-        }
-        if (self.argnames.length === 1 && self.argnames[0] instanceof AST_Symbol) {
-            self.argnames[0].print(output);
-        } else {
-            output.with_parens(function(){
-                self.argnames.forEach(function(arg, i){
-                    if (i) output.comma();
-                    arg.print(output);
-                });
-            });
-        }
-        output.space();
-        output.print('=>');
-        output.space();
-        if (self.body instanceof AST_Node) {
-            self.body.print(output);
-        } else {
-            print_bracketed(self.body, output);
-        }
-        if (needs_parens) { output.print(")") }
-    });
-
     /* -----[ exits ]----- */
     AST_Exit.DEFMETHOD("_do_print", function(output, kind){
         output.print(kind);
@@ -1086,33 +1014,6 @@ function OutputStream(options) {
         self._do_print(output, "throw");
     });
 
-    /* -----[ yield ]----- */
-
-    DEFPRINT(AST_Yield, function(self, output){
-        var star = self.is_star ? "*" : "";
-        output.print("yield" + star);
-        if (self.expression) {
-            output.space();
-            self.expression.print(output);
-        }
-    });
-
-    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);
@@ -1222,7 +1123,7 @@ function OutputStream(options) {
     DEFPRINT(AST_Try, function(self, output){
         output.print("try");
         output.space();
-        print_bracketed(self.body, output);
+        print_bracketed(self, output);
         if (self.bcatch) {
             output.space();
             self.bcatch.print(output);
@@ -1239,12 +1140,12 @@ function OutputStream(options) {
             self.argname.print(output);
         });
         output.space();
-        print_bracketed(self.body, output);
+        print_bracketed(self, output);
     });
     DEFPRINT(AST_Finally, function(self, output){
         output.print("finally");
         output.space();
-        print_bracketed(self.body, output);
+        print_bracketed(self, output);
     });
 
     /* -----[ var/const ]----- */
@@ -1261,111 +1162,9 @@ function OutputStream(options) {
         if (!avoid_semicolon)
             output.semicolon();
     });
-    DEFPRINT(AST_Let, function(self, output){
-        self._do_print(output, "let");
-    });
     DEFPRINT(AST_Var, function(self, output){
         self._do_print(output, "var");
     });
-    DEFPRINT(AST_Const, function(self, output){
-        self._do_print(output, "const");
-    });
-    DEFPRINT(AST_Import, function(self, output) {
-        output.print("import");
-        output.space();
-        if (self.imported_name) {
-            self.imported_name.print(output);
-        }
-        if (self.imported_name && self.imported_names) {
-            output.print(",");
-            output.space();
-        }
-        if (self.imported_names) {
-            if (self.imported_names.length === 1 && self.imported_names[0].foreign_name.name === "*") {
-                self.imported_names[0].print(output);
-            } else {
-                output.print("{");
-                self.imported_names.forEach(function (name_import, i) {
-                    output.space();
-                    name_import.print(output);
-                    if (i < self.imported_names.length - 1) {
-                        output.print(",");
-                    }
-                });
-                output.space();
-                output.print("}");
-            }
-        }
-        if (self.imported_name || self.imported_names) {
-            output.space();
-            output.print("from")
-            output.space();
-        }
-        self.module_name.print(output);
-        output.semicolon();
-    });
-
-    DEFPRINT(AST_NameMapping, function(self, output) {
-        var is_import = output.parent() instanceof AST_Import;
-        var definition = self.name.definition();
-        var names_are_different =
-            (definition && definition.mangled_name || self.name.name) !==
-            self.foreign_name.name;
-        if (names_are_different) {
-            if (is_import) {
-                output.print(self.foreign_name.name);
-            } else {
-                self.name.print(output);
-            }
-            output.space();
-            output.print("as");
-            output.space();
-            if (is_import) {
-                self.name.print(output);
-            } else {
-                output.print(self.foreign_name.name);
-            }
-        } else {
-            self.name.print(output);
-        }
-    });
-
-    DEFPRINT(AST_Export, function(self, output) {
-        output.print("export");
-        output.space();
-        if (self.is_default) {
-            output.print("default");
-            output.space();
-        }
-        if (self.exported_names) {
-            if (self.exported_names.length === 1 && self.exported_names[0].name.name === "*") {
-                self.exported_names[0].print(output);
-            } else {
-                output.print("{");
-                self.exported_names.forEach(function(name_export, i) {
-                    output.space();
-                    name_export.print(output);
-                    if (i < self.exported_names.length - 1) {
-                        output.print(",");
-                    }
-                });
-                output.space();
-                output.print("}");
-            }
-        }
-        else if (self.exported_value) {
-            self.exported_value.print(output);
-        } else if (self.exported_definition) {
-            self.exported_definition.print(output);
-        }
-        if (self.module_name) {
-            output.space();
-            output.print("from");
-            output.space();
-            self.module_name.print(output);
-        }
-        output.semicolon();
-    });
 
     function parenthesize_for_noin(node, output, noin) {
         var parens = false;
@@ -1547,56 +1346,11 @@ function OutputStream(options) {
         });
         else output.print("{}");
     });
-    DEFPRINT(AST_Class, function(self, output){
-        output.print("class");
-        output.space();
-        if (self.name) {
-            self.name.print(output);
-            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) {
-                    output.newline();
-                }
-                output.indent();
-                prop.print(output);
-            });
-            output.newline();
-        });
-        else output.print("{}");
-    });
-    DEFPRINT(AST_NewTarget, function(self, output) {
-        output.print("new.target");
-    });
 
     function print_property_name(key, quote, output) {
         if (output.option("quote_keys")) {
-            output.print_string(key + "");
-        } else if ((typeof key == "number"
-                    || !output.option("beautify")
-                    && +key + "" == key)
-                   && parseFloat(key) >= 0) {
+            output.print_string(key);
+        } else if ("" + +key == key && key >= 0) {
             output.print(make_num(key));
         } else if (RESERVED_WORDS(key) ? !output.option("ie8") : is_identifier_string(key)) {
             if (quote && output.option("keep_quoted_props")) {
@@ -1610,60 +1364,15 @@ function OutputStream(options) {
     }
 
     DEFPRINT(AST_ObjectKeyVal, function(self, output){
-        function get_name(self) {
-            var def = self.definition();
-            return def ? def.mangled_name || def.name : self.name;
-        }
-
-        var allowShortHand = output.option("shorthand");
-        if (allowShortHand &&
-            self.value instanceof AST_Symbol &&
-            is_identifier_string(self.key) &&
-            get_name(self.value) === self.key
-        ) {
-            print_property_name(self.key, self.quote, output);
-
-        } else if (allowShortHand &&
-            self.value instanceof AST_DefaultAssign &&
-            self.value.left instanceof AST_Symbol &&
-            is_identifier_string(self.key) &&
-            get_name(self.value.left) === self.key
-        ) {
-            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)) {
-                print_property_name(self.key, self.quote, output);
-            } else {
-                output.with_square(function() {
-                    self.key.print(output);
-                });
-            }
-            output.colon();
-            self.value.print(output);
-        }
+        print_property_name(self.key, self.quote, output);
+        output.colon();
+        self.value.print(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) {
-            print_property_name(self.key.name, self.quote, output);
-        } else {
-            output.with_square(function() {
-                self.key.print(output);
-            });
-        }
-        self.value._do_print(output, true);
+        output.print(type);
+        output.space();
+        print_property_name(this.key.name, this.quote, output);
+        this.value._do_print(output, true);
     });
     DEFPRINT(AST_ObjectSetter, function(self, output){
         self._print_getter_setter("set", output);
@@ -1671,26 +1380,14 @@ function OutputStream(options) {
     DEFPRINT(AST_ObjectGetter, function(self, output){
         self._print_getter_setter("get", output);
     });
-    DEFPRINT(AST_ConciseMethod, function(self, output){
-        self._print_getter_setter(self.is_generator && "*" || self.async && "async", output);
-    });
-    AST_Symbol.DEFMETHOD("_do_print", function(output){
-        var def = this.definition();
-        output.print_name(def ? def.mangled_name || def.name : this.name);
-    });
-    DEFPRINT(AST_Symbol, function (self, output) {
-        self._do_print(output);
-    });
-    DEFPRINT(AST_SymbolDeclaration, function(self, output){
-        self._do_print(output);
+    DEFPRINT(AST_Symbol, function(self, output){
+        var def = self.definition();
+        output.print_name(def ? def.mangled_name || def.name : self.name);
     });
     DEFPRINT(AST_Hole, noop);
     DEFPRINT(AST_This, function(self, output){
         output.print("this");
     });
-    DEFPRINT(AST_Super, function(self, output){
-        output.print("super");
-    });
     DEFPRINT(AST_Constant, function(self, output){
         output.print(self.getValue());
     });

lib/propmangle.js

@@ -44,16 +44,6 @@
 "use strict";
 
 function find_builtins(reserved) {
-
-    // Compatibility fix for some standard defined globals not defined on every js environment
-    var new_globals = ["Symbol", "Map", "Promise", "Proxy", "Reflect", "Set", "WeakMap", "WeakSet"];
-    var objects = {};
-    var global_ref = typeof global === "object" ? global : self;
-
-    new_globals.forEach(function (new_global) {
-        objects[new_global] = global_ref[new_global] || new Function();
-    });
-
     // NaN will be included due to Number.NaN
     [
         "null",
@@ -65,15 +55,7 @@ function find_builtins(reserved) {
     ].forEach(add);
     [ Object, Array, Function, Number,
       String, Boolean, Error, Math,
-      Date, RegExp, objects.Symbol, ArrayBuffer,
-      DataView, decodeURI, decodeURIComponent,
-      encodeURI, encodeURIComponent, eval, EvalError,
-      Float32Array, Float64Array, Int8Array, Int16Array,
-      Int32Array, isFinite, isNaN, JSON, objects.Map, parseFloat,
-      parseInt, objects.Promise, objects.Proxy, RangeError, ReferenceError,
-      objects.Reflect, objects.Set, SyntaxError, TypeError, Uint8Array,
-      Uint8ClampedArray, Uint16Array, Uint32Array, URIError,
-      objects.WeakMap, objects.WeakSet
+      Date, RegExp
     ].forEach(function(ctor){
         Object.getOwnPropertyNames(ctor).map(add);
         if (ctor.prototype) {
@@ -93,8 +75,6 @@ function reserve_quoted_keys(ast, reserved) {
     ast.walk(new TreeWalker(function(node) {
         if (node instanceof AST_ObjectKeyVal && node.quote) {
             add(node.key);
-        } else if (node instanceof AST_ObjectProperty && node.quote) {
-            add(node.key.name);
         } else if (node instanceof AST_Sub) {
             addStrings(node.property, add);
         }
@@ -104,7 +84,7 @@ function reserve_quoted_keys(ast, reserved) {
 function addStrings(node, add) {
     node.walk(new TreeWalker(function(node) {
         if (node instanceof AST_Sequence) {
-            addStrings(node.expressions[node.expressions.length - 1], add);
+            addStrings(node.tail_node(), add);
         } else if (node instanceof AST_String) {
             add(node.value);
         } else if (node instanceof AST_Conditional) {
@@ -130,12 +110,15 @@ function mangle_properties(ast, options) {
     if (!Array.isArray(reserved)) reserved = [];
     if (!options.builtins) find_builtins(reserved);
 
-    var cache = options.cache;
-    if (cache == null) {
-        cache = {
-            cname: -1,
-            props: new Dictionary()
-        };
+    var cname = -1;
+    var cache;
+    if (options.cache) {
+        cache = options.cache.props;
+        cache.each(function(mangled_name) {
+            push_uniq(reserved, mangled_name);
+        });
+    } else {
+        cache = new Dictionary();
     }
 
     var regex = options.regex;
@@ -192,7 +175,7 @@ function mangle_properties(ast, options) {
         if (unmangleable.indexOf(name) >= 0) return false;
         if (reserved.indexOf(name) >= 0) return false;
         if (options.only_cache) {
-            return cache.props.has(name);
+            return cache.has(name);
         }
         if (/^-?[0-9]+(\.[0-9]+)?(e[+-][0-9]+)?$/.test(name)) return false;
         return true;
@@ -201,7 +184,7 @@ function mangle_properties(ast, options) {
     function should_mangle(name) {
         if (regex && !regex.test(name)) return false;
         if (reserved.indexOf(name) >= 0) return false;
-        return cache.props.has(name)
+        return cache.has(name)
             || names_to_mangle.indexOf(name) >= 0;
     }
 
@@ -219,7 +202,7 @@ function mangle_properties(ast, options) {
             return name;
         }
 
-        var mangled = cache.props.get(name);
+        var mangled = cache.get(name);
         if (!mangled) {
             if (debug) {
                 // debug mode: use a prefix and suffix to preserve readability, e.g. o.foo -> o._$foo$NNN_.
@@ -233,11 +216,11 @@ function mangle_properties(ast, options) {
             // either debug mode is off, or it is on and we could not use the mangled name
             if (!mangled) {
                 do {
-                    mangled = base54(++cache.cname);
+                    mangled = base54(++cname);
                 } while (!can_mangle(mangled));
             }
 
-            cache.props.set(name, mangled);
+            cache.set(name, mangled);
         }
         return mangled;
     }

lib/scope.js

@@ -43,16 +43,17 @@
 
 "use strict";
 
-function SymbolDef(scope, index, orig) {
+function SymbolDef(scope, orig, init) {
     this.name = orig.name;
     this.orig = [ orig ];
+    this.init = init;
+    this.eliminated = 0;
     this.scope = scope;
     this.references = [];
+    this.replaced = 0;
     this.global = false;
-    this.export = false;
     this.mangled_name = null;
     this.undeclared = false;
-    this.index = index;
     this.id = SymbolDef.next_id++;
 };
 
@@ -63,16 +64,11 @@ SymbolDef.prototype = {
         if (!options) options = {};
 
         return (this.global && !options.toplevel)
-            || this.export
             || this.undeclared
             || (!options.eval && (this.scope.uses_eval || this.scope.uses_with))
             || (options.keep_fnames
                 && (this.orig[0] instanceof AST_SymbolLambda
-                    || this.orig[0] instanceof AST_SymbolDefun))
-            || this.orig[0] instanceof AST_SymbolMethod
-            || (options.keep_classnames
-                && (this.orig[0] instanceof AST_SymbolClass
-                    || this.orig[0] instanceof AST_SymbolDefClass));
+                    || this.orig[0] instanceof AST_SymbolDefun));
     },
     mangle: function(options) {
         var cache = options.cache && options.cache.props;
@@ -103,7 +99,6 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
     options = defaults(options, {
         cache: null,
         ie8: false,
-        safari10: false,
     });
 
     // pass 1: setup scope chaining and handle definitions
@@ -111,33 +106,15 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
     var scope = self.parent_scope = null;
     var labels = new Dictionary();
     var defun = null;
-    var in_destructuring = null;
-    var for_scopes = [];
     var tw = new TreeWalker(function(node, descend){
-        if (node.is_block_scope()) {
+        if (node instanceof AST_Catch) {
             var save_scope = scope;
-            node.block_scope = scope = new AST_Scope(node);
+            scope = new AST_Scope(node);
             scope.init_scope_vars(save_scope);
-            if (!(node instanceof AST_Scope)) {
-                scope.uses_with = save_scope.uses_with;
-                scope.uses_eval = save_scope.uses_eval;
-                scope.directives = save_scope.directives;
-            }
-            if (options.safari10) {
-                if (node instanceof AST_For || node instanceof AST_ForIn) {
-                    for_scopes.push(scope);
-                }
-            }
             descend();
             scope = save_scope;
             return true;
         }
-        if (node instanceof AST_Destructuring) {
-            in_destructuring = node;  // These don't nest
-            descend();
-            in_destructuring = null;
-            return true;
-        }
         if (node instanceof AST_Scope) {
             node.init_scope_vars(scope);
             var save_scope = scope;
@@ -174,7 +151,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
             node.references = [];
         }
         if (node instanceof AST_SymbolLambda) {
-            defun.def_function(node);
+            defun.def_function(node, node.name == "arguments" ? undefined : defun);
         }
         else if (node instanceof AST_SymbolDefun) {
             // Careful here, the scope where this should be defined is
@@ -182,44 +159,10 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
             // scope when we encounter the AST_Defun node (which is
             // instanceof AST_Scope) but we get to the symbol a bit
             // later.
-            var parent_lambda = defun.parent_scope;
-            while (parent_lambda.is_block_scope()) {
-                parent_lambda = parent_lambda.parent_scope;
-            }
-            mark_export((node.scope = parent_lambda).def_function(node), 1);
+            (node.scope = defun.parent_scope).def_function(node, defun);
         }
-        else if (node instanceof AST_SymbolClass) {
-            mark_export(defun.def_variable(node), 1);
-        }
-        else if (node instanceof AST_SymbolImport) {
-            scope.def_variable(node);
-        }
-        else if (node instanceof AST_SymbolDefClass) {
-            // This deals with the name of the class being available
-            // inside the class.
-            mark_export((node.scope = defun.parent_scope).def_function(node), 1);
-        }
-        else if (node instanceof AST_SymbolVar
-            || node instanceof AST_SymbolLet
-            || node instanceof AST_SymbolConst) {
-            var def = ((node instanceof AST_SymbolBlockDeclaration) ? scope : defun).def_variable(node);
-            if (!all(def.orig, function(sym) {
-                if (sym === node) return true;
-                if (node instanceof AST_SymbolBlockDeclaration) {
-                    return sym instanceof AST_SymbolLambda;
-                }
-                return !(sym instanceof AST_SymbolLet || sym instanceof AST_SymbolConst);
-            })) {
-                js_error(
-                    node.name + " redeclared",
-                    node.start.file,
-                    node.start.line,
-                    node.start.col,
-                    node.start.pos
-                );
-            }
-            if (!(node instanceof AST_SymbolFunarg)) mark_export(def, 2);
-            def.destructuring = in_destructuring;
+        else if (node instanceof AST_SymbolVar) {
+            defun.def_variable(node, node.TYPE == "SymbolVar" ? null : undefined);
             if (defun !== scope) {
                 node.mark_enclosed(options);
                 var def = scope.find_variable(node);
@@ -241,26 +184,6 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
             }));
             node.thedef = sym;
         }
-        if (!(scope instanceof AST_Toplevel) && (node instanceof AST_Export || node instanceof AST_Import)) {
-            js_error(
-                node.TYPE + " statement may only appear at top level",
-                node.start.file,
-                node.start.line,
-                node.start.col,
-                node.start.pos
-            );
-        }
-
-        function mark_export(def, level) {
-            if (in_destructuring) {
-                var i = 0;
-                do {
-                    level++;
-                } while (tw.parent(i++) !== in_destructuring);
-            }
-            var node = tw.parent(level);
-            def.export = node instanceof AST_Export;
-        }
     });
     self.walk(tw);
 
@@ -278,9 +201,8 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
                     s.uses_eval = true;
                 }
             }
-            var sym;
-            if (tw.parent() instanceof AST_NameMapping && tw.parent(1).module_name
-                || !(sym = node.scope.find_variable(name))) {
+            var sym = node.scope.find_variable(name);
+            if (!sym) {
                 sym = self.def_global(node);
             } else if (sym.scope instanceof AST_Lambda && name == "arguments") {
                 sym.scope.uses_arguments = true;
@@ -320,23 +242,6 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
             }
         }));
     }
-
-    // pass 4: add symbol definitions to loop scopes
-    // Safari/Webkit bug workaround - loop init let variable shadowing argument.
-    // https://github.com/mishoo/UglifyJS2/issues/1753
-    // https://bugs.webkit.org/show_bug.cgi?id=171041
-    if (options.safari10) {
-        for (var i = 0; i < for_scopes.length; i++) {
-            var scope = for_scopes[i];
-            scope.parent_scope.variables.each(function(def) {
-                push_uniq(scope.enclosed, def);
-            });
-        }
-    }
-
-    if (options.cache) {
-        this.cname = options.cache.cname;
-    }
 });
 
 AST_Toplevel.DEFMETHOD("def_global", function(node){
@@ -344,7 +249,7 @@ AST_Toplevel.DEFMETHOD("def_global", function(node){
     if (globals.has(name)) {
         return globals.get(name);
     } else {
-        var g = new SymbolDef(this, globals.size(), node);
+        var g = new SymbolDef(this, node);
         g.undeclared = true;
         g.global = true;
         globals.set(name, g);
@@ -362,14 +267,6 @@ AST_Scope.DEFMETHOD("init_scope_vars", function(parent_scope){
     this.cname = -1;                    // the current index for mangling functions/variables
 });
 
-AST_Node.DEFMETHOD("is_block_scope", return_false);
-AST_Class.DEFMETHOD("is_block_scope", return_false);
-AST_Lambda.DEFMETHOD("is_block_scope", return_false);
-AST_Toplevel.DEFMETHOD("is_block_scope", return_false);
-AST_SwitchBranch.DEFMETHOD("is_block_scope", return_false);
-AST_Block.DEFMETHOD("is_block_scope", return_true);
-AST_IterationStatement.DEFMETHOD("is_block_scope", return_true);
-
 AST_Lambda.DEFMETHOD("init_scope_vars", function(){
     AST_Scope.prototype.init_scope_vars.apply(this, arguments);
     this.uses_arguments = false;
@@ -406,34 +303,37 @@ AST_Scope.DEFMETHOD("find_variable", function(name){
         || (this.parent_scope && this.parent_scope.find_variable(name));
 });
 
-AST_Scope.DEFMETHOD("def_function", function(symbol){
-    var def = this.def_variable(symbol);
+AST_Scope.DEFMETHOD("def_function", function(symbol, init){
+    var def = this.def_variable(symbol, init);
+    if (!def.init || def.init instanceof AST_Defun) def.init = init;
     this.functions.set(symbol.name, def);
     return def;
 });
 
-AST_Scope.DEFMETHOD("def_variable", function(symbol){
-    var def;
-    if (!this.variables.has(symbol.name)) {
-        def = new SymbolDef(this, this.variables.size(), symbol);
+AST_Scope.DEFMETHOD("def_variable", function(symbol, init){
+    var def = this.variables.get(symbol.name);
+    if (def) {
+        def.orig.push(symbol);
+        if (def.init && (def.scope !== symbol.scope || def.init instanceof AST_Function)) {
+            def.init = init;
+        }
+    } else {
+        def = new SymbolDef(this, symbol, init);
         this.variables.set(symbol.name, def);
         def.global = !this.parent_scope;
-    } else {
-        def = this.variables.get(symbol.name);
-        def.orig.push(symbol);
     }
     return symbol.thedef = def;
 });
 
-AST_Scope.DEFMETHOD("next_mangled", function(options){
-    var ext = this.enclosed;
+function next_mangled(scope, options) {
+    var ext = scope.enclosed;
     out: while (true) {
-        var m = base54(++this.cname);
+        var m = base54(++scope.cname);
         if (!is_identifier(m)) continue; // skip over "do"
 
         // https://github.com/mishoo/UglifyJS2/issues/242 -- do not
         // shadow a name reserved from mangling.
-        if (options.reserved.indexOf(m) >= 0) continue;
+        if (member(m, options.reserved)) continue;
 
         // we must ensure that the mangled name does not shadow a name
         // from some parent scope that is referenced in this or in
@@ -445,6 +345,18 @@ AST_Scope.DEFMETHOD("next_mangled", function(options){
         }
         return m;
     }
+}
+
+AST_Scope.DEFMETHOD("next_mangled", function(options){
+    return next_mangled(this, options);
+});
+
+AST_Toplevel.DEFMETHOD("next_mangled", function(options){
+    var name;
+    do {
+        name = next_mangled(this, options);
+    } while (member(name, this.mangled_names));
+    return name;
 });
 
 AST_Function.DEFMETHOD("next_mangled", function(options, def){
@@ -458,7 +370,7 @@ AST_Function.DEFMETHOD("next_mangled", function(options, def){
     var tricky_name = tricky_def ? tricky_def.mangled_name || tricky_def.name : null;
 
     while (true) {
-        var name = AST_Lambda.prototype.next_mangled.call(this, options, def);
+        var name = next_mangled(this, options);
         if (!tricky_name || tricky_name != name)
             return name;
     }
@@ -485,25 +397,23 @@ AST_Symbol.DEFMETHOD("global", function(){
     return this.definition().global;
 });
 
-AST_Toplevel.DEFMETHOD("_default_mangler_options", function(options){
+AST_Toplevel.DEFMETHOD("_default_mangler_options", function(options) {
     options = defaults(options, {
         eval        : false,
         ie8         : false,
-        keep_classnames: false,
         keep_fnames : false,
         reserved    : [],
         toplevel    : false,
     });
     if (!Array.isArray(options.reserved)) options.reserved = [];
+    // Never mangle arguments
+    push_uniq(options.reserved, "arguments");
     return options;
 });
 
 AST_Toplevel.DEFMETHOD("mangle_names", function(options){
     options = this._default_mangler_options(options);
 
-    // Never mangle arguments
-    options.reserved.push('arguments');
-
     // We only need to mangle declaration nodes.  Special logic wired
     // into the code generator will display the mangled name if it's
     // present (and for AST_SymbolRef-s it'll use the mangled name of
@@ -511,12 +421,14 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options){
     var lname = -1;
     var to_mangle = [];
 
+    var mangled_names = this.mangled_names = [];
     if (options.cache) {
-        this.globals.each(function(symbol){
-            if (options.reserved.indexOf(symbol.name) < 0) {
-                to_mangle.push(symbol);
-            }
-        });
+        this.globals.each(collect);
+        if (options.cache.props) {
+            options.cache.props.each(function(mangled_name) {
+                push_uniq(mangled_names, mangled_name);
+            });
+        }
     }
 
     var tw = new TreeWalker(function(node, descend){
@@ -528,13 +440,7 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options){
             return true;        // don't descend again in TreeWalker
         }
         if (node instanceof AST_Scope) {
-            var p = tw.parent(), a = [];
-            node.variables.each(function(symbol){
-                if (options.reserved.indexOf(symbol.name) < 0) {
-                    a.push(symbol);
-                }
-            });
-            to_mangle.push.apply(to_mangle, a);
+            node.variables.each(collect);
             return;
         }
         if (node instanceof AST_Label) {
@@ -543,24 +449,84 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options){
             node.mangled_name = name;
             return true;
         }
-        var mangle_with_block_scope =
-            (!options.ie8 && node instanceof AST_SymbolCatch) ||
-            node instanceof AST_SymbolBlockDeclaration;
-        if (mangle_with_block_scope) {
+        if (!options.ie8 && node instanceof AST_SymbolCatch) {
             to_mangle.push(node.definition());
             return;
         }
     });
     this.walk(tw);
-    to_mangle.forEach(function(def){
-        def.mangle(options);
-    });
+    to_mangle.forEach(function(def){ def.mangle(options) });
 
-    if (options.cache) {
-        options.cache.cname = this.cname;
+    function collect(symbol) {
+        if (!member(symbol.name, options.reserved)) {
+            to_mangle.push(symbol);
+        }
     }
 });
 
+AST_Toplevel.DEFMETHOD("find_colliding_names", function(options) {
+    var cache = options.cache && options.cache.props;
+    var avoid = Object.create(null);
+    options.reserved.forEach(to_avoid);
+    this.globals.each(add_def);
+    this.walk(new TreeWalker(function(node) {
+        if (node instanceof AST_Scope) node.variables.each(add_def);
+        if (node instanceof AST_SymbolCatch) add_def(node.definition());
+    }));
+    return avoid;
+
+    function to_avoid(name) {
+        avoid[name] = true;
+    }
+
+    function add_def(def) {
+        var name = def.name;
+        if (def.global && cache && cache.has(name)) name = cache.get(name);
+        else if (!def.unmangleable(options)) return;
+        to_avoid(name);
+    }
+});
+
+AST_Toplevel.DEFMETHOD("expand_names", function(options) {
+    base54.reset();
+    base54.sort();
+    options = this._default_mangler_options(options);
+    var avoid = this.find_colliding_names(options);
+    var cname = 0;
+    this.globals.each(rename);
+    this.walk(new TreeWalker(function(node) {
+        if (node instanceof AST_Scope) node.variables.each(rename);
+        if (node instanceof AST_SymbolCatch) rename(node.definition());
+    }));
+
+    function next_name() {
+        var name;
+        do {
+            name = base54(cname++);
+        } while (avoid[name] || !is_identifier(name));
+        return name;
+    }
+
+    function rename(def) {
+        if (def.global && options.cache) return;
+        if (def.unmangleable(options)) return;
+        if (member(def.name, options.reserved)) return;
+        var d = def.redefined();
+        def.name = d ? d.name : next_name();
+        def.orig.forEach(function(sym) {
+            sym.name = def.name;
+        });
+        def.references.forEach(function(sym) {
+            sym.name = def.name;
+        });
+    }
+});
+
+AST_Node.DEFMETHOD("tail_node", return_this);
+AST_Sequence.DEFMETHOD("tail_node", function() {
+    return this.expressions[this.expressions.length - 1];
+});
+
 AST_Toplevel.DEFMETHOD("compute_char_frequency", function(options){
     options = this._default_mangler_options(options);
     try {
@@ -589,7 +555,7 @@ AST_Toplevel.DEFMETHOD("compute_char_frequency", function(options){
             skip_string(node.consequent);
             skip_string(node.alternative);
         } else if (node instanceof AST_Sequence) {
-            skip_string(node.expressions[node.expressions.length - 1]);
+            skip_string(node.tail_node());
         }
     }
 });

lib/transform.js

@@ -60,12 +60,9 @@ TreeTransformer.prototype = new TreeWalker;
             tw.push(this);
             if (tw.before) x = tw.before(this, descend, in_list);
             if (x === undefined) {
-                if (!tw.after) {
-                    x = this;
-                    descend(x, tw);
-                } else {
-                    tw.stack[tw.stack.length - 1] = x = this;
-                    descend(x, tw);
+                x = this;
+                descend(x, tw);
+                if (tw.after) {
                     y = tw.after(x, in_list);
                     if (y !== undefined) x = y;
                 }
@@ -163,18 +160,10 @@ TreeTransformer.prototype = new TreeWalker;
         if (self.value) self.value = self.value.transform(tw);
     });
 
-    _(AST_Destructuring, function(self, tw) {
-        self.names = do_list(self.names, tw);
-    });
-
     _(AST_Lambda, function(self, tw){
         if (self.name) self.name = self.name.transform(tw);
         self.argnames = do_list(self.argnames, tw);
-        if (self.body instanceof AST_Node) {
-            self.body = self.body.transform(tw);
-        } else {
-            self.body = do_list(self.body, tw);
-        }
+        self.body = do_list(self.body, tw);
     });
 
     _(AST_Call, function(self, tw){
@@ -195,14 +184,6 @@ TreeTransformer.prototype = new TreeWalker;
         self.property = self.property.transform(tw);
     });
 
-    _(AST_Yield, function(self, tw){
-        if (self.expression) self.expression = self.expression.transform(tw);
-    });
-
-    _(AST_Await, function(self, tw){
-        self.expression = self.expression.transform(tw);
-    });
-
     _(AST_Unary, function(self, tw){
         self.expression = self.expression.transform(tw);
     });
@@ -227,50 +208,7 @@ TreeTransformer.prototype = new TreeWalker;
     });
 
     _(AST_ObjectProperty, function(self, tw){
-        if (self.key instanceof AST_Node) {
-            self.key = self.key.transform(tw);
-        }
         self.value = self.value.transform(tw);
     });
 
-    _(AST_Class, function(self, tw){
-        if (self.name) self.name = self.name.transform(tw);
-        if (self.extends) self.extends = self.extends.transform(tw);
-        self.properties = do_list(self.properties, tw);
-    });
-
-    _(AST_Expansion, function(self, tw){
-        self.expression = self.expression.transform(tw);
-    });
-
-    _(AST_NameMapping, function(self, tw) {
-        self.foreign_name = self.foreign_name.transform(tw);
-        self.name = self.name.transform(tw);
-    });
-
-    _(AST_Import, function(self, tw) {
-        if (self.imported_name) self.imported_name = self.imported_name.transform(tw);
-        if (self.imported_names) do_list(self.imported_names, tw);
-        self.module_name = self.module_name.transform(tw);
-    });
-
-    _(AST_Export, function(self, tw) {
-        if (self.exported_definition) self.exported_definition = self.exported_definition.transform(tw);
-        if (self.exported_value) self.exported_value = self.exported_value.transform(tw);
-        if (self.exported_names) do_list(self.exported_names, tw);
-        if (self.module_name) self.module_name = self.module_name.transform(tw);
-    });
-
-    _(AST_TemplateString, function(self, tw) {
-        for (var i = 0; i < self.segments.length; i++) {
-            if (!(self.segments[i] instanceof AST_TemplateSegment)) {
-                self.segments[i] = self.segments[i].transform(tw);
-            }
-        }
-    });
-
-    _(AST_PrefixedTemplateString, function(self, tw) {
-        self.template_string = self.template_string.transform(tw);
-    });
-
 })();

lib/utils.js

@@ -43,10 +43,6 @@
 
 "use strict";
 
-function slice(a, start) {
-    return Array.prototype.slice.call(a, start || 0);
-};
-
 function characters(str) {
     return str.split("");
 };
@@ -214,18 +210,6 @@ function mergeSort(array, cmp) {
     return _ms(array);
 };
 
-function set_difference(a, b) {
-    return a.filter(function(el){
-        return b.indexOf(el) < 0;
-    });
-};
-
-function set_intersection(a, b) {
-    return a.filter(function(el){
-        return b.indexOf(el) >= 0;
-    });
-};
-
 // this function is taken from Acorn [1], written by Marijn Haverbeke
 // [1] https://github.com/marijnh/acorn
 function makePredicate(words) {
@@ -319,6 +303,13 @@ Dictionary.prototype = {
             ret.push(f(this._values[i], i.substr(1)));
         return ret;
     },
+    clone: function() {
+        var ret = new Dictionary();
+        for (var i in this._values)
+            ret._values[i] = this._values[i];
+        ret._size = this._size;
+        return ret;
+    },
     toObject: function() { return this._values }
 };
 Dictionary.fromObject = function(obj) {
@@ -340,7 +331,7 @@ function first_in_statement(stack) {
         if (p instanceof AST_Statement && p.body === node)
             return true;
         if ((p instanceof AST_Sequence      && p.expressions[0] === node) ||
-            (p instanceof AST_Call          && p.expression === node && !(p instanceof AST_New) ) ||
+            (p.TYPE == "Call"               && p.expression === node ) ||
             (p instanceof AST_Dot           && p.expression === node ) ||
             (p instanceof AST_Sub           && p.expression === node ) ||
             (p instanceof AST_Conditional   && p.condition === node  ) ||

package.json

@@ -1,20 +1,18 @@
 {
-  "name": "uglify-es",
-  "description": "JavaScript parser, mangler/compressor and beautifier toolkit for ES6+",
-  "homepage": "https://github.com/mishoo/UglifyJS2/tree/harmony",
+  "name": "uglify-js",
+  "description": "JavaScript parser, mangler/compressor and beautifier toolkit",
+  "homepage": "http://lisperator.net/uglifyjs",
   "author": "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)",
   "license": "BSD-2-Clause",
-  "version": "3.1.1",
+  "version": "3.3.11",
   "engines": {
     "node": ">=0.8.0"
   },
   "maintainers": [
+    "Alex Lam <alexlamsl@gmail.com>",
     "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)"
   ],
-  "repository": "git+https://github.com/mishoo/UglifyJS2.git#harmony",
-  "bugs": {
-    "url": "https://github.com/mishoo/UglifyJS2/issues"
-  },
+  "repository": "mishoo/UglifyJS2",
   "main": "tools/node.js",
   "bin": {
     "uglifyjs": "bin/uglifyjs"
@@ -26,33 +24,16 @@
     "LICENSE"
   ],
   "dependencies": {
-    "commander": "~2.11.0",
-    "source-map": "~0.5.1"
+    "commander": "~2.14.1",
+    "source-map": "~0.6.1"
   },
   "devDependencies": {
-    "acorn": "~5.1.1",
+    "acorn": "~5.4.1",
     "mocha": "~3.5.1",
-    "semver": "~5.4.1"
+    "semver": "~5.5.0"
   },
   "scripts": {
     "test": "node test/run-tests.js"
   },
-  "keywords": [
-    "uglify",
-    "uglify-es",
-    "uglify-js",
-    "minify",
-    "minifier",
-    "javascript",
-    "ecmascript",
-    "es5",
-    "es6",
-    "es7",
-    "es8",
-    "es2015",
-    "es2016",
-    "es2017",
-    "async",
-    "await"
-  ]
+  "keywords": ["uglify", "uglify-js", "minify", "minifier", "es5"]
 }

test/benchmark.js

@@ -21,6 +21,7 @@ var urls = [
     "http://builds.emberjs.com/tags/v2.11.0/ember.prod.js",
     "https://cdn.jsdelivr.net/lodash/4.17.4/lodash.js",
     "https://cdnjs.cloudflare.com/ajax/libs/d3/4.5.0/d3.js",
+    "https://raw.githubusercontent.com/kangax/html-minifier/v3.5.7/dist/htmlminifier.js",
 ];
 var results = {};
 var remaining = 2 * urls.length;

test/compress/arrays.js

@@ -1,5 +1,3 @@
-// NOTE trailing comma doesn't contribute to length of an array
-// That also means the array changes length if previous element is a hole too and got cut off
 holes_and_undefined: {
     input: {
         w = [1,,];
@@ -93,79 +91,6 @@ constant_join_2: {
     }
 }
 
-spread_with_variable_as_last_element: {
-    input: {
-        var values = [4, 5, 6];
-        var a = [1, 2, 3, ...values];
-    }
-    expect: {
-        var values = [4, 5, 6];
-        var a = [1, 2, 3, ...values];
-    }
-}
-
-spread_with_variable_in_middle: {
-    input: {
-        var values = [4, 5, 6];
-        var a = [1, 2, 3, ...values, 7,,,];
-    }
-    expect: {
-        var values = [4, 5, 6];
-        var a = [1, 2, 3, ...values, 7,,,];
-    }
-}
-
-spread_with_variable_at_front: {
-    input: {
-        var values = [1, 2, 3];
-        var a = [...values, 4, 5, 6];
-    }
-    expect: {
-        var values = [1, 2, 3];
-        var a = [...values, 4, 5, 6];
-    }
-}
-
-spread_with_variable_at_front_after_elisions: {
-    input: {
-        var values = [1, 2, 3];
-        var a = [,,,...values, 4, 5, 6];
-    }
-    expect: {
-        var values = [1, 2, 3];
-        var a = [,,,...values, 4, 5, 6];
-    }
-}
-
-spread_with_array_at_end: {
-    input: {
-        var a = [1, 2, ...[4, 5, 6]];
-    }
-    expect: {
-        var a = [1, 2, ...[4, 5, 6]];
-    }
-}
-
-spread_with_logical_expression_at_end: {
-    options = { evaluate: true }
-    input: {
-        var a = [1, 2, 3, ...[2+2]]
-    }
-    expect: {
-        var a = [1, 2, 3, ...[4]]
-    }
-}
-
-spread_with_logical_expression_at_middle: {
-    options = { evaluate: true }
-    input: {
-        var a = [1, 1, ...[1+1, 1+2, 2+3], 8]
-    }
-    expect: {
-        var a = [1, 1, ...[2, 3, 5], 8]
-    }
-}
-
 constant_join_3: {
     options = {
         unsafe: true,
@@ -203,50 +128,114 @@ constant_join_3: {
 
 for_loop: {
     options = {
-        unsafe      : true,
-        unused      : true,
-        evaluate    : true,
-        reduce_vars : true
+        evaluate: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        unsafe: true,
+        unused: true,
     };
     input: {
         function f0() {
             var a = [1, 2, 3];
-            for (var i = 0; i < a.length; i++) {
-                console.log(a[i]);
-            }
+            var b = 0;
+            for (var i = 0; i < a.length; i++)
+                b += a[i];
+            return b;
         }
-
         function f1() {
             var a = [1, 2, 3];
-            for (var i = 0, len = a.length; i < len; i++) {
-                console.log(a[i]);
-            }
+            var b = 0;
+            for (var i = 0, len = a.length; i < len; i++)
+                b += a[i];
+            return b;
         }
-
-        function f2() {
-            var a = [1, 2, 3];
-            for (var i = 0; i < a.length; i++) {
-                a[i]++;
-            }
-        }
-    }
-    expect: {
-        function f0() {
-            var a = [1, 2, 3];
-            for (var i = 0; i < 3; i++)
-                console.log(a[i]);
-        }
-
-        function f1() {
-            var a = [1, 2, 3];
-            for (var i = 0; i < 3; i++)
-                console.log(a[i]);
-        }
-
         function f2() {
             var a = [1, 2, 3];
             for (var i = 0; i < a.length; i++)
                 a[i]++;
+            return a[2];
         }
+        console.log(f0(), f1(), f2());
     }
+    expect: {
+        function f0() {
+            var a = [1, 2, 3];
+            var b = 0;
+            for (var i = 0; i < 3; i++)
+                b += a[i];
+            return b;
+        }
+        function f1() {
+            var a = [1, 2, 3];
+            var b = 0;
+            for (var i = 0; i < 3; i++)
+                b += a[i];
+            return b;
+        }
+        function f2() {
+            var a = [1, 2, 3];
+            for (var i = 0; i < a.length; i++)
+                a[i]++;
+            return a[2];
+        }
+        console.log(f0(), f1(), f2());
+    }
+    expect_stdout: "6 6 4"
+}
+
+index: {
+    options = {
+        evaluate: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unsafe: true,
+        unused: true,
+    }
+    input: {
+        var a = [ 1, 2 ];
+        console.log(a[0], a[1]);
+    }
+    expect: {
+        console.log(1, 2);
+    }
+    expect_stdout: "1 2"
+}
+
+length: {
+    options = {
+        evaluate: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unsafe: true,
+        unused: true,
+    }
+    input: {
+        var a = [ 1, 2 ];
+        console.log(a.length);
+    }
+    expect: {
+        console.log(2);
+    }
+    expect_stdout: "2"
+}
+
+index_length: {
+    options = {
+        evaluate: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unsafe: true,
+        unused: true,
+    }
+    input: {
+        var a = [ 1, 2 ];
+        console.log(a[0], a.length);
+    }
+    expect: {
+        console.log(1, 2);
+    }
+    expect_stdout: "1 2"
 }

test/compress/arrow.js

@@ -1,632 +0,0 @@
-arrow_functions_without_body: {
-    input: {
-        var a1 = () => 42;
-        var a2 = (p) => p;
-        var a3 = p => p;
-        var a4 = (...p) => p;
-        var a5 = (b, c) => b + c;
-        var a6 = (b, ...c) => b + c[0];
-        var a7 = (...b) => b.join();
-    }
-    expect: {
-        var a1 = () => 42;
-        var a2 = (p) => p;
-        var a3 = p => p;
-        var a4 = (...p) => p;
-        var a5 = (b, c) => b + c;
-        var a6 = (b, ...c) => b + c[0];
-        var a7 = (...b) => b.join();
-    }
-}
-
-arrow_functions_with_body: {
-    input: {
-        var a1 = () => {
-            var a = 42 * Math.random();
-            return a;
-        };
-        var a2 = (p) => {
-            var a = Math.random() * p;
-            return a;
-        };
-        var a3 = p => {
-            var a = Math.random() * p;
-            return a;
-        };
-        var a4 = (...p) => {
-            var a = Math.random() * p;
-            return a;
-        };
-        var a5 = (b, c) => {
-            var result = b * c + b / c;
-            return result
-        };
-        var a6 = (b, ...c) => {
-            var result = b;
-            for (var i = 0; i < c.length; i++)
-                result += c[i];
-            return result
-        };
-        var a7 = (...b) => {
-            b.join();
-        }
-    }
-    expect: {
-        var a1 = () => {
-            var a = 42 * Math.random();
-            return a;
-        };
-        var a2 = (p) => {
-            var a = Math.random() * p;
-            return a;
-        };
-        var a3 = p => {
-            var a = Math.random() * p;
-            return a;
-        };
-        var a4 = (...p) => {
-            var a = Math.random() * p;
-            return a;
-        };
-        var a5 = (b, c) => {
-            var result = b * c + b / c;
-            return result
-        };
-        var a6 = (b, ...c) => {
-            var result = b;
-            for (var i = 0; i < c.length; i++)
-                result += c[i];
-            return result
-        };
-        var a7 = (...b) => {
-            b.join();
-        };
-    }
-}
-
-arrow_function_with_single_parameter_with_default: {
-    input: {
-        var foo = (a = 0) => doSomething(a);
-    }
-    expect_exact: "var foo=(a=0)=>doSomething(a);"
-}
-
-arrow_binding_pattern: {
-    input: {
-        var foo = ([]) => "foo";
-        var bar = ({}) => "bar";
-        var with_default = (foo = "default") => foo;
-        var object_with_default = ({foo = "default", bar: baz = "default"}) => foo;
-        var array_after_spread = (...[foo]) => foo;
-        var array_after_spread = (...{foo}) => foo;
-        var computed = ({ [compute()]: x }) => {};
-        var array_hole = ([, , ...x] = [1, 2]) => {};
-        var object_trailing_elision = ({foo,}) => {};
-        var spread_empty_array = (...[]) => "foo";
-        var spread_empty_object = (...{}) => "foo";
-    }
-    expect: {
-        var foo = ([]) => "foo";
-        var bar = ({}) => "bar";
-        var with_default = (foo = "default") => foo;
-        var object_with_default = ({foo = "default", bar: baz = "default"}) => foo;
-        var array_after_spread = (...[foo]) => foo;
-        var array_after_spread = (...{foo}) => foo;
-        var computed = ({ [compute()]: x }) => {};
-        var array_hole = ([, , ...x] = [1, 2]) => {};
-        var object_trailing_elision = ({foo,}) => {};
-        var spread_empty_array = (...[]) => "foo";
-        var spread_empty_object = (...{}) => "foo";
-    }
-}
-
-arrow_binding_pattern_strict: {
-    input: {
-        var foo = ([,]) => "foo";
-    }
-    expect_exact: 'var foo=([,])=>"foo";'
-}
-
-arrow_with_regexp: {
-    input: {
-        num => /\d{11,14}/.test( num )
-    }
-    expect: {
-        num => /\d{11,14}/.test( num )
-    }
-}
-
-arrow_unused: {
-    options = {
-        toplevel: false,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        top => dog;
-        let fn = a => { console.log(a * a); };
-        let u = (x, y) => x - y + g;
-        (() => { console.log("0"); })();
-        !function(x) {
-            (() => { console.log("1"); })();
-            let unused = x => { console.log(x); };
-            let baz = e => e + e;
-            console.log(baz(x));
-        }(1);
-        fn(3);
-    }
-    expect: {
-        let fn = a => { console.log(a * a); };
-        let u = (x, y) => x - y + g;
-        (() => { console.log("0"); })();
-        !function(x) {
-            (() => { console.log("1"); })();
-            let baz = e => e + e;
-            console.log(baz(x));
-        }(1);
-        fn(3);
-    }
-    expect_stdout: [ "0", "1", "2", "9" ]
-    node_version: ">=6"
-}
-
-arrow_unused_toplevel: {
-    options = {
-        toplevel: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        top => dog;
-        let fn = a => { console.log(a * a); };
-        let u = (x, y) => x - y + g;
-        (() => { console.log("0"); })();
-        !function(x) {
-            (() => { console.log("1"); })();
-            let unused = x => { console.log(x); };
-            let baz = e => e + e;
-            console.log(baz(x));
-        }(1);
-        fn(3);
-    }
-    expect: {
-        let fn = a => { console.log(a * a); };
-        (() => { console.log("0"); })();
-        !function(x) {
-            (() => { console.log("1"); })();
-            let baz = e => e + e;
-            console.log(baz(x));
-        }(1);
-        fn(3);
-    }
-    expect_stdout: [ "0", "1", "2", "9" ]
-    node_version: ">=6"
-}
-
-no_leading_parentheses: {
-    input: {
-        (x,y) => x(y);
-        async (x,y) => await x(y);
-    }
-    expect_exact: "(x,y)=>x(y);async(x,y)=>await x(y);"
-}
-
-async_identifiers: {
-    options = {
-        unsafe_arrows: true,
-        ecma: 6,
-    }
-    input: {
-        var async = function(x){ console.log("async", x); };
-        var await = function(x){ console.log("await", x); };
-        async(1);
-        await(2);
-    }
-    expect: {
-        var async = x => { console.log("async", x); };
-        var await = x => { console.log("await", x); };
-        async(1);
-        await(2);
-    }
-    expect_stdout: [
-        "async 1",
-        "await 2",
-    ]
-    node_version: ">=4"
-}
-
-async_function_expression: {
-    options = {
-        unsafe_arrows: true,
-        ecma: 6,
-        evaluate: true,
-        side_effects: true,
-    }
-    input: {
-        var named = async function foo() {
-            await bar(1 + 0) + (2 + 0);
-        }
-        var anon = async function() {
-            await (1 + 0) + bar(2 + 0);
-        }
-    }
-    expect: {
-        var named = async function foo() {
-            await bar(1);
-        };
-        var anon = async () => {
-            await 1, bar(2);
-        };
-    }
-}
-
-issue_27: {
-    options = {
-        unsafe_arrows: true,
-        collapse_vars: true,
-        ecma: 6,
-        unused: true,
-    }
-    input: {
-        (function(jQuery) {
-            var $;
-            $ = jQuery;
-            $("body").addClass("foo");
-        })(jQuery);
-    }
-    expect: {
-        (jQuery => {
-            jQuery("body").addClass("foo");
-        })(jQuery);
-    }
-}
-
-issue_2105_1: {
-    options = {
-        unsafe_arrows: true,
-        collapse_vars: true,
-        ecma: 6,
-        inline: true,
-        passes: 3,
-        reduce_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: {
-        (() => {
-            var quux = () => {
-                console.log("PASS");
-            };
-            return {
-                prop() {
-                    console.log;
-                    quux();
-                }
-            };
-        })().prop();
-    }
-    expect_stdout: "PASS"
-    node_version: ">=4"
-}
-
-issue_2105_2: {
-    options = {
-        collapse_vars: true,
-        inline: true,
-        passes: 2,
-        reduce_vars: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        ((factory) => {
-            factory();
-        })( () => {
-            return ((fn) => {
-                fn()().prop();
-            })( () => {
-                let bar = () => {
-                    var quux = () => {
-                        console.log("PASS");
-                    }, foo = () => {
-                        console.log;
-                        quux();
-                    };
-                    return { prop: foo };
-                };
-                return bar;
-            } );
-        });
-    }
-    expect: {
-        (() => {
-            var quux = () => {
-                console.log("PASS");
-            };
-            return {
-                prop: () => {
-                    console.log;
-                    quux();
-                }
-            };
-        })().prop();
-    }
-    expect_stdout: "PASS"
-    node_version: ">=6"
-}
-
-issue_2136_2: {
-    options = {
-        arrows: true,
-        collapse_vars: true,
-        ecma: 6,
-        inline: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        function f(x) {
-            console.log(x);
-        }
-        !function(a, ...b) {
-            f(b[0]);
-        }(1, 2, 3);
-    }
-    expect: {
-        function f(x) {
-            console.log(x);
-        }
-        f([2,3][0]);
-    }
-    expect_stdout: "2"
-    node_version: ">=6"
-}
-
-issue_2136_3: {
-    options = {
-        arrows: true,
-        collapse_vars: true,
-        ecma: 6,
-        evaluate: true,
-        inline: true,
-        passes: 3,
-        reduce_vars: true,
-        side_effects: true,
-        toplevel: true,
-        unsafe: true,
-        unused: true,
-    }
-    input: {
-        function f(x) {
-            console.log(x);
-        }
-        !function(a, ...b) {
-            f(b[0]);
-        }(1, 2, 3);
-    }
-    expect: {
-        console.log(2);
-    }
-    expect_stdout: "2"
-    node_version: ">=6"
-}
-
-call_args: {
-    options = {
-        arrows: true,
-        ecma: 6,
-        evaluate: true,
-        inline: true,
-        reduce_vars: true,
-    }
-    input: {
-        const a = 1;
-        console.log(a);
-        +function(a) {
-            return a;
-        }(a);
-    }
-    expect: {
-        const a = 1;
-        console.log(1);
-        +(1, 1);
-    }
-    expect_stdout: true
-}
-
-call_args_drop_param: {
-    options = {
-        arrows: true,
-        ecma: 6,
-        evaluate: true,
-        inline: true,
-        keep_fargs: false,
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        const a = 1;
-        console.log(a);
-        +function(a) {
-            return a;
-        }(a, b);
-    }
-    expect: {
-        const a = 1;
-        console.log(1);
-        +(b, 1);
-    }
-    expect_stdout: true
-}
-
-issue_485_crashing_1530: {
-    options = {
-        arrows: true,
-        conditionals: true,
-        dead_code: true,
-        ecma: 6,
-        evaluate: true,
-        inline: true,
-    }
-    input: {
-        (function(a) {
-            if (true) return;
-            var b = 42;
-        })(this);
-    }
-    expect: {
-        this, void 0;
-    }
-}
-
-issue_2084: {
-    options = {
-        unsafe_arrows: true,
-        collapse_vars: true,
-        conditionals: true,
-        ecma: 6,
-        evaluate: true,
-        inline: true,
-        passes: 2,
-        reduce_vars: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        var c = 0;
-        !function() {
-            !function(c) {
-                c = 1 + c;
-                var c = 0;
-                function f14(a_1) {
-                    if (c = 1 + c, 0 !== 23..toString())
-                        c = 1 + c, a_1 && (a_1[0] = 0);
-                }
-                f14();
-            }(-1);
-        }();
-        console.log(c);
-    }
-    expect: {
-        var c = 0;
-        ((c) => {
-            c = 1 + c,
-            c = 1 + (c = 0),
-            0 !== 23..toString() && (c = 1 + c);
-        })(-1),
-        console.log(c);
-    }
-    expect_stdout: "0"
-    node_version: ">=4"
-}
-
-export_default_object_expression: {
-    options = {
-        arrows: true,
-        evaluate: true,
-    }
-    input: {
-        export default {
-            foo: 1 + 2,
-            bar() { return 4; },
-            get baz() { return this.foo; },
-        };
-    }
-    expect_exact: "export default{foo:3,bar:()=>4,get baz(){return this.foo}};"
-}
-
-concise_methods_with_computed_property2: {
-    options = {
-        arrows: true,
-        evaluate: true,
-    }
-    input: {
-        var foo = {
-            [[1]](v) {
-                return v;
-            }
-        };
-        console.log(foo[[1]]("PASS"));
-    }
-    expect_exact: 'var foo={[[1]]:v=>v};console.log(foo[[1]]("PASS"));'
-    expect_stdout: "PASS"
-    node_version: ">=4"
-}
-
-async_object_literal: {
-    options = {
-        arrows: true,
-        unsafe_arrows: true,
-        ecma: 6,
-        evaluate: true,
-    }
-    input: {
-        var obj = {
-            async a() {
-                return await foo(1 + 0);
-            },
-            anon: async function() {
-                return await foo(2 + 0);
-            }
-        };
-    }
-    expect: {
-        var obj = {
-            a: async () => await foo(1),
-            anon: async () => await foo(2)
-        };
-    }
-}
-
-issue_2271: {
-    options = {
-        arrows: true,
-        ecma: 6,
-        evaluate: true,
-        unsafe_arrows: false,
-    }
-    input: {
-        var Foo = function() {};
-        Foo.prototype.set = function(value) {
-            this.value = value;
-            return this;
-        }
-        Foo.prototype.print = function() {
-            console.log(this.value);
-        }
-        new Foo().set("PASS").print();
-    }
-    expect: {
-        var Foo = function() {};
-        Foo.prototype.set = function(value) {
-            this.value = value;
-            return this;
-        }
-        Foo.prototype.print = function() {
-            console.log(this.value);
-        }
-        new Foo().set("PASS").print();
-    }
-    expect_stdout: "PASS"
-}

test/compress/asm.js

@@ -16,7 +16,6 @@ asm_mixed: {
         hoist_vars    : true,
         if_return     : true,
         join_vars     : true,
-        cascade       : true,
         side_effects  : true,
         negate_iife   : true
     };
@@ -104,3 +103,65 @@ asm_mixed: {
     }
 }
 
+asm_toplevel: {
+    options = {}
+    input: {
+        "use asm";
+        0.0;
+        function f() {
+            0.0;
+            (function(){
+                0.0;
+            });
+        }
+        0.0;
+    }
+    expect_exact: '"use asm";0.0;function f(){0.0;(function(){0.0})}0.0;'
+}
+
+asm_function_expression: {
+    options = {}
+    input: {
+        0.0;
+        var a = function() {
+            "use asm";
+            0.0;
+        }
+        function f() {
+            0.0;
+            return function(){
+                "use asm";
+                0.0;
+            }
+            0.0;
+        }
+        0.0;
+    }
+    expect_exact: '0;var a=function(){"use asm";0.0};function f(){0;return function(){"use asm";0.0};0}0;'
+}
+
+asm_nested_functions: {
+    options = {}
+    input: {
+        0.0;
+        function a() {
+            "use asm";
+            0.0;
+        }
+        0.0;
+        function b() {
+            0.0;
+            function c(){
+                "use asm";
+                0.0;
+            }
+            0.0;
+            function d(){
+                0.0;
+            }
+            0.0;
+        }
+        0.0;
+    }
+    expect_exact: '0;function a(){"use asm";0.0}0;function b(){0;function c(){"use asm";0.0}0;function d(){0}0}0;'
+}

test/compress/async.js

@@ -1,294 +0,0 @@
-await_precedence: {
-    input: {
-        async function f1() { await x + y; }
-        async function f2() { await (x + y); }
-    }
-    expect_exact: "async function f1(){await x+y}async function f2(){await(x+y)}"
-}
-
-await_precedence_prop: {
-    input: {
-        async function f1(){ return (await foo()).bar; }
-        async function f2(){ return (await foo().bar); }
-    }
-    expect_exact: "async function f1(){return(await foo()).bar}async function f2(){return await foo().bar}"
-}
-
-await_precedence_call: {
-    input: {
-        async function f3(){ return (await foo())(); }
-        async function f4(){ return await (foo()()); }
-    }
-    expect_exact: "async function f3(){return(await foo())()}async function f4(){return await foo()()}"
-}
-
-async_function_declaration: {
-    options = {
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        async function f0() {}
-        async function f1() { await x + y; }
-        async function f2() { await (x + y); }
-        async function f3() { await x + await y; }
-        async function f4() { await (x + await y); }
-        async function f5() { await x; await y; }
-        async function f6() { await x, await y; }
-    }
-    expect: {
-        async function f0() {}
-        async function f1() { await x, y; }
-        async function f2() { await (x + y); }
-        async function f3() { await x, await y; }
-        async function f4() { await (x + await y); }
-        async function f5() { await x; await y; }
-        async function f6() { await x, await y; }
-    }
-}
-
-async_function_expression: {
-    options = {
-        evaluate: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        var named = async function foo() {
-            await bar(1 + 0) + (2 + 0);
-        }
-        var anon = async function() {
-            await (1 + 0) + bar(2 + 0);
-        }
-    }
-    expect: {
-        var named = async function() {
-            await bar(1);
-        };
-        var anon = async function() {
-            await 1, bar(2);
-        };
-    }
-}
-
-async_class: {
-    options = {
-        evaluate: true,
-    }
-    input: {
-        class Foo {
-            async m1() {
-                return await foo(1 + 2);
-            }
-            static async m2() {
-                return await foo(3 + 4);
-            }
-        }
-    }
-    expect: {
-        class Foo {
-            async m1() {
-                return await foo(3);
-            }
-            static async m2() {
-                return await foo(7);
-            }
-        }
-    }
-}
-
-async_object_literal: {
-    options = {
-        evaluate: true,
-    }
-    input: {
-        var obj = {
-            async a() {
-                await foo(1 + 0);
-            },
-            anon: async function(){
-                await foo(2 + 0);
-            }
-        };
-    }
-    expect: {
-        var obj = {
-            async a() {
-                await foo(1);
-            },
-            anon: async function() {
-                await foo(2);
-            }
-        };
-    }
-}
-
-async_export: {
-    input: {
-        export async function run() {};
-        export default async function def() {};
-    }
-    expect: {
-        export async function run() {};
-        export default async function def() {};
-    }
-}
-
-async_inline: {
-    options = {
-        collapse_vars: true,
-        conditionals: true,
-        evaluate: true,
-        inline: true,
-        negate_iife: true,
-        reduce_vars: true,
-        side_effects: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        (async function(){ return await 3; })();
-        (async function(x){ await console.log(x); })(4);
-
-        function echo(x) { return x; }
-        echo( async function(){ return await 1; }() );
-        echo( async function(x){ await console.log(x); }(2) );
-
-        function top() { console.log("top"); }
-        top();
-
-        async function async_top() { console.log("async_top"); }
-        async_top();
-    }
-    expect: {
-        !async function(){await 3}();
-        !async function(x){await console.log(4)}();
-
-        function echo(x){return x}
-        echo(async function(){return await 1}());
-        echo(async function(x){await console.log(2)}());
-
-        console.log("top");
-
-        !async function(){console.log("async_top")}();
-    }
-    expect_stdout: [
-        "4",
-        "2",
-        "top",
-        "async_top",
-    ]
-    node_version: ">=8"
-}
-
-async_identifiers: {
-    input: {
-        var async = function(x){ console.log("async", x); };
-        var await = function(x){ console.log("await", x); };
-        async(1);
-        await(2);
-    }
-    expect: {
-        var async = function(x){ console.log("async", x); };
-        var await = function(x){ console.log("await", x); };
-        async(1);
-        await(2);
-    }
-    expect_stdout: [
-        "async 1",
-        "await 2",
-    ]
-}
-
-async_shorthand_property: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        function print(o) { console.log(o.async + " " + o.await); }
-        var async = "Async", await = "Await";
-
-        print({ async });
-        print({ await });
-        print({ async, await });
-        print({ await, async });
-
-        print({ async: async });
-        print({ await: await });
-        print({ async: async, await: await });
-        print({ await: await, async: async });
-    }
-    expect: {
-        function a(a) { console.log(a.async + " " + a.await); }
-        var n = "Async", c = "Await";
-
-        a({ async: n });
-        a({ await: c });
-        a({ async: n, await: c });
-        a({ await: c, async: n });
-
-        a({ async: n });
-        a({ await: c });
-        a({ async: n, await: c });
-        a({ await: c, async: n });
-    }
-    expect_stdout: [
-        "Async undefined",
-        "undefined Await",
-        "Async Await",
-        "Async Await",
-        "Async undefined",
-        "undefined Await",
-        "Async Await",
-        "Async Await",
-    ]
-    node_version: ">=4"
-}
-
-async_arrow: {
-    input: {
-        let a1 = async x => await foo(x);
-        let a2 = async () => await bar();
-        let a3 = async (x) => await baz(x);
-        let a4 = async (x, y) => { await far(x, y); }
-        let a5 = async ({x = [1], y: z = 2}) => { await wow(x, z); }
-    }
-    expect: {
-        let a1 = async x => await foo(x);
-        let a2 = async () => await bar();
-        let a3 = async (x) => await baz(x);
-        let a4 = async (x, y) => { await far(x, y); }
-        let a5 = async ({x = [1], y: z = 2}) => { await wow(x, z); }
-    }
-}
-
-async_arrow_wait: {
-    input: {
-        var a = async (x, y) => await x(y);
-    }
-    expect_exact: "var a=async(x,y)=>await x(y);"
-}
-
-async_arrow_iife: {
-    input: {
-        (async () => {
-            await fetch({});
-        })();
-    }
-    expect_exact: "(async()=>{await fetch({})})();"
-}
-
-async_arrow_iife_negate_iife: {
-    options = {
-        negate_iife: true,
-    }
-    input: {
-        (async () => {
-            await fetch();
-        })();
-        (() => {
-            plain();
-        })();
-    }
-    expect_exact: "(async()=>{await fetch()})();(()=>{plain()})();"
-}

test/compress/block-scope.js

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

test/compress/blocks.js

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

test/compress/comparing.js

@@ -73,4 +73,245 @@ dont_change_in_or_instanceof_expressions: {
         1 instanceof 1;
         null instanceof null;
     }
-}
+}
+
+self_comparison_1: {
+    options = {
+        comparisons: true,
+    }
+    input: {
+        a === a;
+        a !== b;
+        b.c === a.c;
+        b.c !== b.c;
+    }
+    expect: {
+        a == a;
+        a !== b;
+        b.c === a.c;
+        b.c != b.c;
+    }
+}
+
+self_comparison_2: {
+    options = {
+        comparisons: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+    }
+    input: {
+        function f() {}
+        var o = {};
+        console.log(f != f, o === o);
+    }
+    expect: {
+        function f() {}
+        var o = {};
+        console.log(false, true);
+    }
+    expect_stdout: "false true"
+}
+
+issue_2857_1: {
+    options = {
+        comparisons: true,
+    }
+    input: {
+        function f1(a) {
+            a === undefined || a === null;
+            a === undefined || a !== null;
+            a !== undefined || a === null;
+            a !== undefined || a !== null;
+            a === undefined && a === null;
+            a === undefined && a !== null;
+            a !== undefined && a === null;
+            a !== undefined && a !== null;
+        }
+        function f2(a) {
+            a === null || a === undefined;
+            a === null || a !== undefined;
+            a !== null || a === undefined;
+            a !== null || a !== undefined;
+            a === null && a === undefined;
+            a === null && a !== undefined;
+            a !== null && a === undefined;
+            a !== null && a !== undefined;
+        }
+    }
+    expect: {
+        function f1(a) {
+            null == a;
+            void 0 === a || null !== a;
+            void 0 !== a || null === a;
+            void 0 !== a || null !== a;
+            void 0 === a && null === a;
+            void 0 === a && null !== a;
+            void 0 !== a && null === a;
+            null != a;
+        }
+        function f2(a) {
+            null == a;
+            null === a || void 0 !== a;
+            null !== a || void 0 === a;
+            null !== a || void 0 !== a;
+            null === a && void 0 === a;
+            null === a && void 0 !== a;
+            null !== a && void 0 === a;
+            null != a;
+        }
+    }
+}
+
+issue_2857_2: {
+    options = {
+        comparisons: true,
+    }
+    input: {
+        function f(a, p) {
+            a === undefined || a === null || p;
+            a === undefined || a !== null || p;
+            a !== undefined || a === null || p;
+            a !== undefined || a !== null || p;
+            a === undefined && a === null || p;
+            a === undefined && a !== null || p;
+            a !== undefined && a === null || p;
+            a !== undefined && a !== null || p;
+        }
+    }
+    expect: {
+        function f(a, p) {
+            null == a || p;
+            void 0 === a || null !== a || p;
+            void 0 !== a || null === a || p;
+            void 0 !== a || null !== a || p;
+            void 0 === a && null === a || p;
+            void 0 === a && null !== a || p;
+            void 0 !== a && null === a || p;
+            null != a || p;
+        }
+    }
+}
+
+issue_2857_3: {
+    options = {
+        comparisons: true,
+    }
+    input: {
+        function f(a, p) {
+            a === undefined || a === null && p;
+            a === undefined || a !== null && p;
+            a !== undefined || a === null && p;
+            a !== undefined || a !== null && p;
+            a === undefined && a === null && p;
+            a === undefined && a !== null && p;
+            a !== undefined && a === null && p;
+            a !== undefined && a !== null && p;
+        }
+    }
+    expect: {
+        function f(a, p) {
+            void 0 === a || null === a && p;
+            void 0 === a || null !== a && p;
+            void 0 !== a || null === a && p;
+            void 0 !== a || null !== a && p;
+            void 0 === a && null === a && p;
+            void 0 === a && null !== a && p;
+            void 0 !== a && null === a && p;
+            null != a && p;
+        }
+    }
+}
+
+issue_2857_4: {
+    options = {
+        comparisons: true,
+    }
+    input: {
+        function f(a, p) {
+            p || a === undefined || a === null;
+            p || a === undefined || a !== null;
+            p || a !== undefined || a === null;
+            p || a !== undefined || a !== null;
+            p || a === undefined && a === null;
+            p || a === undefined && a !== null;
+            p || a !== undefined && a === null;
+            p || a !== undefined && a !== null;
+        }
+    }
+    expect: {
+        function f(a, p) {
+            p || null == a;
+            p || void 0 === a || null !== a;
+            p || void 0 !== a || null === a;
+            p || void 0 !== a || null !== a;
+            p || void 0 === a && null === a;
+            p || void 0 === a && null !== a;
+            p || void 0 !== a && null === a;
+            p || null != a;
+        }
+    }
+}
+
+issue_2857_5: {
+    options = {
+        comparisons: true,
+    }
+    input: {
+        function f(a, p) {
+            p && a === undefined || a === null;
+            p && a === undefined || a !== null;
+            p && a !== undefined || a === null;
+            p && a !== undefined || a !== null;
+            p && a === undefined && a === null;
+            p && a === undefined && a !== null;
+            p && a !== undefined && a === null;
+            p && a !== undefined && a !== null;
+        }
+    }
+    expect: {
+        function f(a, p) {
+            p && void 0 === a || null === a;
+            p && void 0 === a || null !== a;
+            p && void 0 !== a || null === a;
+            p && void 0 !== a || null !== a;
+            p && void 0 === a && null === a;
+            p && void 0 === a && null !== a;
+            p && void 0 !== a && null === a;
+            p && null != a;
+        }
+    }
+}
+
+issue_2857_6: {
+    options = {
+        comparisons: true,
+        pure_getters: "strict",
+        reduce_vars: true,
+    }
+    input: {
+        function f(a) {
+            if (({}).b === undefined || {}.b === null)
+                return a.b !== undefined && a.b !== null;
+        }
+        console.log(f({
+            a: [ null ],
+            get b() {
+                return this.a.shift();
+            }
+        }));
+    }
+    expect: {
+        function f(a) {
+            if (null == {}.b)
+                return void 0 !== a.b && null !== a.b;
+        }
+        console.log(f({
+            a: [ null ],
+            get b() {
+                return this.a.shift();
+            }
+        }));
+    }
+    expect_stdout: "true"
+}

test/compress/conditionals.js

@@ -166,22 +166,24 @@ cond_1: {
         conditionals: true
     };
     input: {
-        var do_something; // if undeclared it's assumed to have side-effects
-        if (some_condition()) {
-            do_something(x);
-        } else {
-            do_something(y);
-        }
-        if (some_condition()) {
-            side_effects(x);
-        } else {
-            side_effects(y);
+        function foo(do_something, some_condition) {
+            if (some_condition) {
+                do_something(x);
+            } else {
+                do_something(y);
+            }
+            if (some_condition) {
+                side_effects(x);
+            } else {
+                side_effects(y);
+            }
         }
     }
     expect: {
-        var do_something;
-        do_something(some_condition() ? x : y);
-        some_condition() ? side_effects(x) : side_effects(y);
+        function foo(do_something, some_condition) {
+            do_something(some_condition ? x : y);
+            some_condition ? side_effects(x) : side_effects(y);
+        }
     }
 }
 
@@ -190,16 +192,18 @@ cond_2: {
         conditionals: true
     };
     input: {
-        var x, FooBar;
-        if (some_condition()) {
-            x = new FooBar(1);
-        } else {
-            x = new FooBar(2);
+        function foo(x, FooBar, some_condition) {
+            if (some_condition) {
+                x = new FooBar(1);
+            } else {
+                x = new FooBar(2);
+            }
         }
     }
     expect: {
-        var x, FooBar;
-        x = new FooBar(some_condition() ? 1 : 2);
+        function foo(x, FooBar, some_condition) {
+            x = new FooBar(some_condition ? 1 : 2);
+        }
     }
 }
 
@@ -605,11 +609,47 @@ cond_8c: {
     }
 }
 
+cond_9: {
+    options = {
+        conditionals: true,
+    }
+    input: {
+        function f(x, y) {
+            g() ? x(1) : x(2);
+            x ? (y || x)() : (y || x)();
+            x ? y(a, b) : y(d, b, c);
+            x ? y(a, b, c) : y(a, b, c);
+            x ? y(a, b, c) : y(a, b, f);
+            x ? y(a, b, c) : y(a, e, c);
+            x ? y(a, b, c) : y(a, e, f);
+            x ? y(a, b, c) : y(d, b, c);
+            x ? y(a, b, c) : y(d, b, f);
+            x ? y(a, b, c) : y(d, e, c);
+            x ? y(a, b, c) : y(d, e, f);
+        }
+    }
+    expect: {
+        function f(x, y) {
+            g() ? x(1) : x(2);
+            x, (y || x)();
+            x ? y(a, b) : y(d, b, c);
+            x, y(a, b, c);
+            y(a, b, x ? c : f);
+            y(a, x ? b : e, c);
+            x ? y(a, b, c) : y(a, e, f);
+            y(x ? a : d, b, c);
+            x ? y(a, b, c) : y(d, b, f);
+            x ? y(a, b, c) : y(d, e, c);
+            x ? y(a, b, c) : y(d, e, f);
+        }
+    }
+}
+
 ternary_boolean_consequent: {
     options = {
         collapse_vars:true, sequences:true, properties:true, dead_code:true, conditionals:true,
         comparisons:true, evaluate:true, booleans:true, loops:true, unused:true, hoist_funs:true,
-        keep_fargs:true, if_return:true, join_vars:true, cascade:true, side_effects:true
+        keep_fargs:true, if_return:true, join_vars:true, side_effects:true
     }
     input: {
         function f1() { return a == b ? true : x; }
@@ -637,7 +677,7 @@ ternary_boolean_alternative: {
     options = {
         collapse_vars:true, sequences:true, properties:true, dead_code:true, conditionals:true,
         comparisons:true, evaluate:true, booleans:true, loops:true, unused:true, hoist_funs:true,
-        keep_fargs:true, if_return:true, join_vars:true, cascade:true, side_effects:true
+        keep_fargs:true, if_return:true, join_vars:true, side_effects:true
     }
     input: {
         function f1() { return a == b ? x : true; }
@@ -1015,3 +1055,215 @@ delete_conditional_2: {
     }
     expect_stdout: true
 }
+
+issue_2535_1: {
+    options = {
+        booleans: true,
+        conditionals: true,
+        evaluate: true,
+        passes: 2,
+        side_effects: true,
+    }
+    input: {
+        if (true || x()) y();
+        if (true && x()) y();
+        if (x() || true) y();
+        if (x() && true) y();
+        if (false || x()) y();
+        if (false && x()) y();
+        if (x() || false) y();
+        if (x() && false) y();
+    }
+    expect: {
+        y();
+        x() && y();
+        (x(), 1) && y();
+        x() && y();
+        x() && y();
+        x() && y();
+        (x(), 0) && y();
+    }
+}
+
+issue_2535_2: {
+    options = {
+        booleans: true,
+        conditionals: true,
+        evaluate: true,
+        side_effects: true,
+    }
+    input: {
+        function x() {}
+        function y() {
+            return "foo";
+        }
+        console.log((x() || true) || y());
+        console.log((y() || true) || x());
+        console.log((x() || true) && y());
+        console.log((y() || true) && x());
+        console.log((x() && true) || y());
+        console.log((y() && true) || x());
+        console.log((x() && true) && y());
+        console.log((y() && true) && x());
+        console.log((x() || false) || y());
+        console.log((y() || false) || x());
+        console.log((x() || false) && y());
+        console.log((y() || false) && x());
+        console.log((x() && false) || y());
+        console.log((y() && false) || x());
+        console.log((x() && false) && y());
+        console.log((y() && false) && x());
+    }
+    expect: {
+        function x() {}
+        function y() {
+            return "foo";
+        }
+        console.log(x() || !0);
+        console.log(y() || !0);
+        console.log((x(), y()));
+        console.log((y(), x()));
+        console.log(!!x() || y());
+        console.log(!!y() || x());
+        console.log(x() && y());
+        console.log(y() && x());
+        console.log(x() || y());
+        console.log(y() || x());
+        console.log(!!x() && y());
+        console.log(!!y() && x());
+        console.log((x(), y()));
+        console.log((y(), x()));
+        console.log(x() && !1);
+        console.log(y() && !1);
+    }
+    expect_stdout: [
+        "true",
+        "foo",
+        "foo",
+        "undefined",
+        "foo",
+        "true",
+        "undefined",
+        "undefined",
+        "foo",
+        "foo",
+        "false",
+        "undefined",
+        "foo",
+        "undefined",
+        "undefined",
+        "false",
+    ]
+}
+
+issue_2560: {
+    options = {
+        conditionals: true,
+        inline: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        function log(x) {
+            console.log(x);
+        }
+        function foo() {
+            return log;
+        }
+        function bar() {
+            if (x !== (x = foo())) {
+                x(1);
+            } else {
+                x(2);
+            }
+        }
+        var x = function() {
+            console.log("init");
+        };
+        bar();
+        bar();
+    }
+    expect: {
+        function log(x) {
+            console.log(x);
+        }
+        function bar() {
+            x !== (x = log) ? x(1) : x(2);
+        }
+        var x = function() {
+            console.log("init");
+        };
+        bar();
+        bar();
+    }
+    expect_stdout: [
+        "1",
+        "2",
+    ]
+}
+
+hoist_decl: {
+    options = {
+        conditionals: true,
+        join_vars: true,
+        sequences: true,
+    }
+    input: {
+        if (x()) {
+            var a;
+            y();
+        } else {
+            z();
+            var b;
+        }
+    }
+    expect: {
+        var a, b;
+        x() ? y() : z();
+    }
+}
+
+to_and_or: {
+    options = {
+        conditionals: true,
+    }
+    input: {
+        var values = [
+            0,
+            null,
+            true,
+            "foo",
+            false,
+            -1 / 0,
+            void 0,
+        ];
+        values.forEach(function(x) {
+            values.forEach(function(y) {
+                values.forEach(function(z) {
+                    console.log(x ? y || z : z);
+                });
+            });
+        });
+    }
+    expect: {
+        var values = [
+            0,
+            null,
+            true,
+            "foo",
+            false,
+            -1 / 0,
+            void 0,
+        ];
+        values.forEach(function(x) {
+            values.forEach(function(y) {
+                values.forEach(function(z) {
+                    console.log(x && y || z);
+                });
+            });
+        });
+    }
+    expect_stdout: true
+}

test/compress/const.js

@@ -1,166 +0,0 @@
-issue_1191: {
-    options = {
-        evaluate      : true,
-        booleans      : true,
-        comparisons   : true,
-        dead_code     : true,
-        conditionals  : true,
-        side_effects  : true,
-        unused        : true,
-        hoist_funs    : true,
-        if_return     : true,
-        join_vars     : true,
-        sequences     : false,
-        collapse_vars : false,
-        reduce_vars   : true,
-    }
-    input: {
-        function foo(rot) {
-            const rotTol = 5;
-            if (rot < -rotTol || rot > rotTol)
-                bar();
-            baz();
-        }
-    }
-    expect: {
-        function foo(rot) {
-            (rot < -5 || rot > 5) && bar();
-            baz();
-        }
-    }
-}
-
-issue_1194: {
-    options = {
-        evaluate      : true,
-        booleans      : true,
-        comparisons   : true,
-        dead_code     : true,
-        conditionals  : true,
-        side_effects  : true,
-        unused        : true,
-        hoist_funs    : true,
-        if_return     : true,
-        join_vars     : true,
-        sequences     : false,
-        collapse_vars : false,
-        reduce_vars   : true,
-    }
-    input: {
-        function f1() {const a = "X"; return a + a;}
-        function f2() {const aa = "X"; return aa + aa;}
-        function f3() {const aaa = "X"; return aaa + aaa;}
-    }
-    expect: {
-        function f1(){return"XX"}
-        function f2(){return"XX"}
-        function f3(){return"XX"}
-    }
-}
-
-issue_1396: {
-    options = {
-        evaluate      : true,
-        booleans      : true,
-        comparisons   : true,
-        dead_code     : true,
-        conditionals  : true,
-        side_effects  : true,
-        unused        : true,
-        hoist_funs    : true,
-        if_return     : true,
-        join_vars     : true,
-        sequences     : false,
-        collapse_vars : false,
-        reduce_vars   : true,
-    }
-    input: {
-        function foo(a) {
-            const VALUE = 1;
-            console.log(2 | VALUE);
-            console.log(VALUE + 1);
-            console.log(VALUE);
-            console.log(a & VALUE);
-        }
-        function bar() {
-            const s = "01234567890123456789";
-            console.log(s + s + s + s + s);
-
-            const CONSTANT = "abc";
-            console.log(CONSTANT + CONSTANT + CONSTANT + CONSTANT + CONSTANT);
-        }
-    }
-    expect: {
-        function foo(a) {
-            console.log(3);
-            console.log(2);
-            console.log(1);
-            console.log(1 & a);
-        }
-        function bar() {
-            const s = "01234567890123456789";
-            console.log(s + s + s + s + s);
-
-            console.log("abcabcabcabcabc");
-        }
-    }
-}
-
-unused_regexp_literal: {
-    options = {
-        evaluate      : true,
-        booleans      : true,
-        comparisons   : true,
-        dead_code     : true,
-        conditionals  : true,
-        side_effects  : true,
-        unused        : true,
-        hoist_funs    : true,
-        if_return     : true,
-        join_vars     : true,
-        sequences     : false,
-        collapse_vars : false,
-    }
-    input: {
-        function f(){ var a = /b/; }
-    }
-    expect: {
-        function f(){}
-    }
-}
-
-regexp_literal_not_const: {
-    options = {
-        evaluate      : true,
-        booleans      : true,
-        comparisons   : true,
-        dead_code     : true,
-        conditionals  : true,
-        side_effects  : true,
-        unused        : true,
-        hoist_funs    : true,
-        if_return     : true,
-        join_vars     : true,
-        sequences     : false,
-        collapse_vars : false,
-        reduce_vars   : true,
-    }
-    input: {
-        (function(){
-            var result;
-            const s = 'acdabcdeabbb';
-            const REGEXP_LITERAL = /ab*/g;
-            while (result = REGEXP_LITERAL.exec(s)) {
-                console.log(result[0]);
-            }
-        })();
-    }
-    expect: {
-        (function() {
-            var result;
-            const REGEXP_LITERAL = /ab*/g;
-            while (result = REGEXP_LITERAL.exec("acdabcdeabbb")) console.log(result[0]);
-        })();
-    }
-    expect_stdout: true
-}

test/compress/dead-code.js

@@ -54,52 +54,12 @@ dead_code_2_should_warn: {
             x = 10;
             throw new Error("foo");
             var x;
-            var g;
+            function g(){};
         }
         f();
     }
     expect_stdout: true
-    node_version: ">=6"
-}
-
-dead_code_2_should_warn_strict: {
-    options = {
-        dead_code: true
-    };
-    input: {
-        "use strict";
-        function f() {
-            g();
-            x = 10;
-            throw new Error("foo");
-            // completely discarding the `if` would introduce some
-            // bugs.  UglifyJS v1 doesn't deal with this issue; in v2
-            // we copy any declarations to the upper scope.
-            if (x) {
-                y();
-                var x;
-                function g(){};
-                // but nested declarations should not be kept.
-                (function(){
-                    var q;
-                    function y(){};
-                })();
-            }
-        }
-        f();
-    }
-    expect: {
-        "use strict";
-        function f() {
-            g();
-            x = 10;
-            throw new Error("foo");
-            var x;
-        }
-        f();
-    }
-    expect_stdout: true
-    node_version: ">=4"
+    node_version: "<=4"
 }
 
 dead_code_constant_boolean_should_warn_more: {
@@ -126,198 +86,15 @@ dead_code_constant_boolean_should_warn_more: {
     }
     expect: {
         var foo;
-        var bar;
+        function bar() {}
         // nothing for the while
         // as for the for, it should keep:
+        var moo;
         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: {
-    options = {
-        dead_code    : true,
-        conditionals : true,
-        booleans     : true,
-        evaluate     : true
-    };
-    input: {
-        if (0) {
-            let foo = 6;
-            const bar = 12;
-            class Baz {};
-            var qux;
-        }
-        console.log(foo, bar, Baz);
-    }
-    expect: {
-        var qux;
-        console.log(foo, bar, Baz);
-    }
-}
-
-dead_code_const_declaration: {
-    options = {
-        dead_code    : true,
-        loops        : true,
-        booleans     : true,
-        conditionals : true,
-        evaluate     : true,
-        reduce_vars  : true,
-    };
-    input: {
-        var unused;
-        const CONST_FOO = false;
-        if (CONST_FOO) {
-            console.log("unreachable");
-            var moo;
-            function bar() {}
-        }
-    }
-    expect: {
-        var unused;
-        const CONST_FOO = !1;
-        var moo;
-        var bar;
-    }
-    expect_stdout: true
-}
-
-dead_code_const_annotation: {
-    options = {
-        dead_code    : true,
-        loops        : true,
-        booleans     : true,
-        conditionals : true,
-        evaluate     : true,
-        reduce_vars  : true,
-        toplevel     : true,
-    };
-    input: {
-        var unused;
-        /** @const */ var CONST_FOO_ANN = false;
-        if (CONST_FOO_ANN) {
-            console.log("unreachable");
-            var moo;
-            function bar() {}
-        }
-    }
-    expect: {
-        var unused;
-        var CONST_FOO_ANN = !1;
-        var moo;
-        var bar;
-    }
-    expect_stdout: true
-}
-
-dead_code_const_annotation_regex: {
-    options = {
-        dead_code    : true,
-        loops        : true,
-        booleans     : true,
-        conditionals : true,
-        evaluate     : true
-    };
-    input: {
-        var unused;
-        // @constraint this shouldn't be a constant
-        var CONST_FOO_ANN = false;
-        if (CONST_FOO_ANN) {
-            console.log("reachable");
-        }
-    }
-    expect: {
-        var unused;
-        var CONST_FOO_ANN = !1;
-        CONST_FOO_ANN && console.log('reachable');
-    }
-    expect_stdout: true
-}
-
-dead_code_const_annotation_complex_scope: {
-    options = {
-        dead_code    : true,
-        loops        : true,
-        booleans     : true,
-        conditionals : true,
-        evaluate     : true,
-        reduce_vars  : true,
-        toplevel     : true,
-    };
-    input: {
-        var unused_var;
-        /** @const */ var test = 'test';
-        // @const
-        var CONST_FOO_ANN = false;
-        var unused_var_2;
-        if (CONST_FOO_ANN) {
-            console.log("unreachable");
-            var moo;
-            function bar() {}
-        }
-        if (test === 'test') {
-            var beef = 'good';
-            /** @const */ var meat = 'beef';
-            var pork = 'bad';
-            if (meat === 'pork') {
-                console.log('also unreachable');
-            } else if (pork === 'good') {
-                console.log('reached, not const');
-            }
-        }
-    }
-    expect: {
-        var unused_var;
-        var test = 'test';
-        var CONST_FOO_ANN = !1;
-        var unused_var_2;
-        var moo;
-        var bar;
-        var beef = 'good';
-        var meat = 'beef';
-        var pork = 'bad';
-    }
-    expect_stdout: true
+    node_version: "<=4"
 }
 
 try_catch_finally: {
@@ -325,6 +102,8 @@ try_catch_finally: {
         conditionals: true,
         dead_code: true,
         evaluate: true,
+        passes: 2,
+        side_effects: true,
     }
     input: {
         var a = 1;
@@ -439,6 +218,7 @@ global_timeout_and_interval_symbols: {
 issue_2233_2: {
     options = {
         pure_getters: "strict",
+        reduce_funcs: true,
         reduce_vars: true,
         side_effects: true,
         unsafe: true,
@@ -470,6 +250,7 @@ issue_2233_2: {
 issue_2233_3: {
     options = {
         pure_getters: "strict",
+        reduce_funcs: true,
         reduce_vars: true,
         side_effects: true,
         toplevel: true,
@@ -560,3 +341,579 @@ global_fns: {
         "RangeError",
     ]
 }
+
+collapse_vars_assignment: {
+    options = {
+        collapse_vars: true,
+        dead_code: true,
+        passes: 2,
+        unused: true,
+    }
+    input: {
+        function f0(c) {
+            var a = 3 / c;
+            return a = a;
+        }
+    }
+    expect: {
+        function f0(c) {
+            return 3 / c;
+        }
+    }
+}
+
+collapse_vars_lvalues_drop_assign: {
+    options = {
+        collapse_vars: true,
+        dead_code: true,
+        unused: true,
+    }
+    input: {
+        function f0(x) { var i = ++x; return x += i; }
+        function f1(x) { var a = (x -= 3); return x += a; }
+        function f2(x) { var z = x, a = ++z; return z += a; }
+    }
+    expect: {
+        function f0(x) { var i = ++x; return x + i; }
+        function f1(x) { var a = (x -= 3); return x + a; }
+        function f2(x) { var z = x, a = ++z; return z + a; }
+    }
+}
+
+collapse_vars_misc1: {
+    options = {
+        collapse_vars: true,
+        dead_code: true,
+        unused: true,
+    }
+    input: {
+        function f10(x) { var a = 5, b = 3; return a += b; }
+        function f11(x) { var a = 5, b = 3; return a += --b; }
+    }
+    expect: {
+        function f10(x) { return 5 + 3; }
+        function f11(x) { var b = 3; return 5 + --b; }
+    }
+}
+
+return_assignment: {
+    options = {
+        dead_code: true,
+        unused: true,
+    }
+    input: {
+        function f1(a, b, c) {
+            return a = x(), b = y(), b = a && (c >>= 5);
+        }
+        function f2() {
+            return e = x();
+        }
+        function f3(e) {
+            return e = x();
+        }
+        function f4() {
+            var e;
+            return e = x();
+        }
+        function f5(a) {
+            try {
+                return a = x();
+            } catch (b) {
+                console.log(a);
+            }
+        }
+        function f6(a) {
+            try {
+                return a = x();
+            } finally {
+                console.log(a);
+            }
+        }
+        function y() {
+            console.log("y");
+        }
+        function test(inc) {
+            var counter = 0;
+            x = function() {
+                counter += inc;
+                if (inc < 0) throw counter;
+                return counter;
+            };
+            [ f1, f2, f3, f4, f5, f6 ].forEach(function(f, i) {
+                e = null;
+                try {
+                    i += 1;
+                    console.log("result " + f(10 * i, 100 * i, 1000 * i));
+                } catch (x) {
+                    console.log("caught " + x);
+                }
+                if (null !== e) console.log("e: " + e);
+            });
+        }
+        var x, e;
+        test(1);
+        test(-1);
+    }
+    expect: {
+        function f1(a, b, c) {
+            return a = x(), y(), a && (c >> 5);
+        }
+        function f2() {
+            return e = x();
+        }
+        function f3(e) {
+            return x();
+        }
+        function f4() {
+            return x();
+        }
+        function f5(a) {
+            try {
+                return x();
+            } catch (b) {
+                console.log(a);
+            }
+        }
+        function f6(a) {
+            try {
+                return a = x();
+            } finally {
+                console.log(a);
+            }
+        }
+        function y() {
+            console.log("y");
+        }
+        function test(inc) {
+            var counter = 0;
+            x = function() {
+                counter += inc;
+                if (inc < 0) throw counter;
+                return counter;
+            };
+            [ f1, f2, f3, f4, f5, f6 ].forEach(function(f, i) {
+                e = null;
+                try {
+                    i += 1;
+                    console.log("result " + f(10 * i, 100 * i, 1000 * i));
+                } catch (x) {
+                    console.log("caught " + x);
+                }
+                if (null !== e) console.log("e: " + e);
+            });
+        }
+        var x, e;
+        test(1);
+        test(-1);
+    }
+    expect_stdout: [
+        "y",
+        "result 31",
+        "result 2",
+        "e: 2",
+        "result 3",
+        "result 4",
+        "result 5",
+        "6",
+        "result 6",
+        "caught -1",
+        "caught -2",
+        "caught -3",
+        "caught -4",
+        "50",
+        "result undefined",
+        "60",
+        "caught -6",
+    ]
+}
+
+throw_assignment: {
+    options = {
+        dead_code: true,
+        unused: true,
+    }
+    input: {
+        function f1() {
+            throw a = x();
+        }
+        function f2(a) {
+            throw a = x();
+        }
+        function f3() {
+            var a;
+            throw a = x();
+        }
+        function f4() {
+            try {
+                throw a = x();
+            } catch (b) {
+                console.log(a);
+            }
+        }
+        function f5(a) {
+            try {
+                throw a = x();
+            } catch (b) {
+                console.log(a);
+            }
+        }
+        function f6() {
+            var a;
+            try {
+                throw a = x();
+            } catch (b) {
+                console.log(a);
+            }
+        }
+        function f7() {
+            try {
+                throw a = x();
+            } finally {
+                console.log(a);
+            }
+        }
+        function f8(a) {
+            try {
+                throw a = x();
+            } finally {
+                console.log(a);
+            }
+        }
+        function f9() {
+            var a;
+            try {
+                throw a = x();
+            } finally {
+                console.log(a);
+            }
+        }
+        function test(inc) {
+            var counter = 0;
+            x = function() {
+                counter += inc;
+                if (inc < 0) throw counter;
+                return counter;
+            };
+            [ f1, f2, f3, f4, f5, f6, f7, f8, f9 ].forEach(function(f, i) {
+                a = null;
+                try {
+                    f(10 * (1 + i));
+                } catch (x) {
+                    console.log("caught " + x);
+                }
+                if (null !== a) console.log("a: " + a);
+            });
+        }
+        var x, a;
+        test(1);
+        test(-1);
+    }
+    expect: {
+        function f1() {
+            throw a = x();
+        }
+        function f2(a) {
+            throw x();
+        }
+        function f3() {
+            throw x();
+        }
+        function f4() {
+            try {
+                throw a = x();
+            } catch (b) {
+                console.log(a);
+            }
+        }
+        function f5(a) {
+            try {
+                throw a = x();
+            } catch (b) {
+                console.log(a);
+            }
+        }
+        function f6() {
+            var a;
+            try {
+                throw a = x();
+            } catch (b) {
+                console.log(a);
+            }
+        }
+        function f7() {
+            try {
+                throw a = x();
+            } finally {
+                console.log(a);
+            }
+        }
+        function f8(a) {
+            try {
+                throw a = x();
+            } finally {
+                console.log(a);
+            }
+        }
+        function f9() {
+            var a;
+            try {
+                throw a = x();
+            } finally {
+                console.log(a);
+            }
+        }
+        function test(inc) {
+            var counter = 0;
+            x = function() {
+                counter += inc;
+                if (inc < 0) throw counter;
+                return counter;
+            };
+            [ f1, f2, f3, f4, f5, f6, f7, f8, f9 ].forEach(function(f, i) {
+                a = null;
+                try {
+                    f(10 * (1 + i));
+                } catch (x) {
+                    console.log("caught " + x);
+                }
+                if (null !== a) console.log("a: " + a);
+            });
+        }
+        var x, a;
+        test(1);
+        test(-1);
+    }
+    expect_stdout: [
+        "caught 1",
+        "a: 1",
+        "caught 2",
+        "caught 3",
+        "4",
+        "a: 4",
+        "5",
+        "6",
+        "7",
+        "caught 7",
+        "a: 7",
+        "8",
+        "caught 8",
+        "9",
+        "caught 9",
+        "caught -1",
+        "caught -2",
+        "caught -3",
+        "null",
+        "50",
+        "undefined",
+        "null",
+        "caught -7",
+        "80",
+        "caught -8",
+        "undefined",
+        "caught -9",
+    ]
+}
+
+issue_2597: {
+    options = {
+        dead_code: true,
+    }
+    input: {
+        function f(b) {
+            try {
+                try {
+                    throw "foo";
+                } catch (e) {
+                    return b = true;
+                }
+            } finally {
+                b && (a = "PASS");
+            }
+        }
+        var a = "FAIL";
+        f();
+        console.log(a);
+    }
+    expect: {
+        function f(b) {
+            try {
+                try {
+                    throw "foo";
+                } catch (e) {
+                    return b = true;
+                }
+            } finally {
+                b && (a = "PASS");
+            }
+        }
+        var a = "FAIL";
+        f();
+        console.log(a);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_2666: {
+    options = {
+        dead_code: true,
+    }
+    input: {
+        function f(a) {
+            return a = {
+                p: function() {
+                    return a;
+                }
+            };
+        }
+        console.log(typeof f().p());
+    }
+    expect: {
+        function f(a) {
+            return a = {
+                p: function() {
+                    return a;
+                }
+            };
+        }
+        console.log(typeof f().p());
+    }
+    expect_stdout: "object"
+}
+
+issue_2692: {
+    options = {
+        dead_code: true,
+        reduce_vars: false,
+    }
+    input: {
+        function f(a) {
+            return a = g;
+            function g() {
+                return a;
+            }
+        }
+        console.log(typeof f()());
+    }
+    expect: {
+        function f(a) {
+            return a = g;
+            function g() {
+                return a;
+            }
+        }
+        console.log(typeof f()());
+    }
+    expect_stdout: "function"
+}
+
+issue_2701: {
+    options = {
+        dead_code: true,
+        inline: false,
+    }
+    input: {
+        function f(a) {
+            return a = function() {
+                return function() {
+                    return a;
+                };
+            }();
+        }
+        console.log(typeof f()());
+    }
+    expect: {
+        function f(a) {
+            return a = function() {
+                return function() {
+                    return a;
+                };
+            }();
+        }
+        console.log(typeof f()());
+    }
+    expect_stdout: "function"
+}
+
+issue_2749: {
+    options = {
+        dead_code: true,
+        inline: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = 2, c = "PASS";
+        while (a--)
+            (function() {
+                return b ? c = "FAIL" : b = 1;
+                try {
+                } catch (b) {
+                    var b;
+                }
+            })();
+        console.log(c);
+    }
+    expect: {
+        var a = 2, c = "PASS";
+        while (a--)
+            b = void 0, b ? c = "FAIL" : b = 1;
+        var b;
+        console.log(c);
+    }
+    expect_stdout: "PASS"
+}
+
+unsafe_builtin: {
+    options = {
+        side_effects: true,
+        unsafe: true,
+    }
+    input: {
+        (!w).constructor(x);
+        Math.abs(y);
+        [ 1, 2, z ].valueOf();
+    }
+    expect: {
+        w, x;
+        y;
+        z;
+    }
+}
+
+issue_2860_1: {
+    options = {
+        dead_code: true,
+        evaluate: true,
+        reduce_vars: true,
+    }
+    input: {
+        console.log(function(a) {
+            return a ^= 1;
+        }());
+    }
+    expect: {
+        console.log(function(a) {
+            return 1 ^ a;
+        }());
+    }
+    expect_stdout: "1"
+}
+
+issue_2860_2: {
+    options = {
+        dead_code: true,
+        evaluate: true,
+        inline: true,
+        passes: 2,
+        reduce_vars: true,
+    }
+    input: {
+        console.log(function(a) {
+            return a ^= 1;
+        }());
+    }
+    expect: {
+        console.log(1);
+    }
+    expect_stdout: "1"
+}

test/compress/destructuring.js

@@ -1,661 +0,0 @@
-destructuring_arrays: {
-    input: {
-        {const [aa, bb] = cc;}
-        {const [aa, [bb, cc]] = dd;}
-        {let [aa, bb] = cc;}
-        {let [aa, [bb, cc]] = dd;}
-        var [aa, bb] = cc;
-        var [aa, [bb, cc]] = dd;
-        var [,[,,,,,],,,zz,] = xx; // Trailing comma
-        var [,,zzz,,] = xxx; // Trailing comma after hole
-    }
-    expect: {
-        {const [aa, bb] = cc;}
-        {const [aa, [bb, cc]] = dd;}
-        {let [aa, bb] = cc;}
-        {let [aa, [bb, cc]] = dd;}
-        var [aa, bb] = cc;
-        var [aa, [bb, cc]] = dd;
-        var [,[,,,,,],,,zz] = xx;
-        var [,,zzz,,] = xxx;
-    }
-}
-
-destructuring_arrays_holes: {
-    input: {
-        var [,,,,] = a;
-        var [,,b,] = c;
-        var [d,,]  = e;
-    }
-    expect_exact: "var[,,,,]=a;var[,,b]=c;var[d,,]=e;"
-}
-
-destructuring_objects: {
-    input: {
-        {const {aa, bb} = {aa:1, bb:2};}
-        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
-        {let {aa, bb} = {aa:1, bb:2};}
-        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
-        var {aa, bb} = {aa:1, bb:2};
-        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
-    }
-    expect: {
-        {const {aa, bb} = {aa:1, bb:2};}
-        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
-        {let {aa, bb} = {aa:1, bb:2};}
-        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
-        var {aa, bb} = {aa:1, bb:2};
-        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
-    }
-}
-
-destructuring_objects_trailing_elision: {
-    beautify = {
-        ecma: 6
-    }
-    input: {
-        var {cc,} = foo;
-    }
-    expect_exact: "var{cc}=foo;"
-}
-
-nested_destructuring_objects: {
-    beautify = {
-        ecma: 6
-    }
-    input: {
-        const [{a},b] = c;
-        let [{d},e] = f;
-        var [{g},h] = i;
-    }
-    expect_exact: 'const[{a},b]=c;let[{d},e]=f;var[{g},h]=i;';
-}
-
-destructuring_constdef_in_loops: {
-    beautify = {
-        ecma: 6
-    }
-    input: {
-        for (const [x,y] in pairs);
-        for (const [a] = 0;;);
-        for (const {c} of cees);
-    }
-    expect_exact: "for(const[x,y]in pairs);for(const[a]=0;;);for(const{c}of cees);"
-}
-
-destructuring_letdef_in_loops: {
-    beautify = {
-        ecma: 6
-    }
-    input: {
-        for (let [x,y] in pairs);
-        for (let [a] = 0;;);
-        for (let {c} of cees);
-    }
-    expect_exact: "for(let[x,y]in pairs);for(let[a]=0;;);for(let{c}of cees);"
-}
-
-destructuring_vardef_in_loops: {
-    beautify = {
-        ecma: 6
-    }
-    input: {
-        for (var [x,y] in pairs);
-        for (var [a] = 0;;);
-        for (var {c} of cees);
-    }
-    expect_exact: "for(var[x,y]in pairs);for(var[a]=0;;);for(var{c}of cees);"
-}
-
-destructuring_expressions: {
-    beautify = {
-        ecma: 6
-    }
-    input: {
-        ({a, b});
-        [{a}];
-        f({x});
-    }
-    expect_exact: "({a,b});[{a}];f({x});"
-}
-
-destructuring_remove_unused_1: {
-    options = {
-        unused: true
-    }
-    input: {
-        function a() {
-            var unused = "foo";
-            var a = [1];
-            var [b] = a;
-            f(b);
-        }
-        function b() {
-            var unused = "foo";
-            var a = {b: 1};
-            var {b} = a;
-            f(b);
-        }
-        function c() {
-            var unused = "foo";
-            var a = [[1]];
-            var [[b]] = a;
-            f(b);
-        }
-        function d() {
-            var unused = "foo";
-            var a = {b: {b:1}};
-            var {b:{b}} = a;
-            f(b);
-        }
-        function e() {
-            var unused = "foo";
-            var a = [1, 2, 3, 4, 5];
-            var x = [[1, 2, 3]];
-            var y = {h: 1};
-            var [b, ...c] = a;
-            var [...[e, f]] = x;
-            var [...{g: h}] = y;
-            f(b, c, e, f, g);
-        }
-    }
-    expect: {
-        function a() {
-            var a = [1];
-            var [b] = a;
-            f(b);
-        }
-        function b() {
-            var a = {b: 1};
-            var {b} = a;
-            f(b);
-        }
-        function c() {
-            var a = [[1]];
-            var [[b]] = a;
-            f(b);
-        }
-        function d() {
-            var a = {b: {b:1}};
-            var {b:{b}} = a;
-            f(b);
-        }
-        function e() {
-            var a = [1, 2, 3, 4, 5];
-            var x = [[1, 2, 3]];
-            var y = {h: 1};
-            var [b, ...c] = a;
-            var [...[e, f]] = x;
-            var [...{g: h}] = y;
-            f(b, c, e, f, g);
-        }
-    }
-}
-
-destructuring_remove_unused_2: {
-    options = {
-        unused: true
-    }
-    input: {
-        function a() {
-            var unused = "foo";
-            var a = [,,1];
-            var [b] = a;
-            f(b);
-        }
-        function b() {
-            var unused = "foo";
-            var a = [{a: [1]}];
-            var [{b: a}] = a;
-            f(b);
-        }
-    }
-    expect: {
-        function a() {
-            var a = [,,1];
-            var [b] = a;
-            f(b);
-        }
-        function b() {
-            var a = [{a: [1]}];
-            var [{b: a}] = a;
-            f(b);
-        }
-    }
-}
-
-object_destructuring_may_need_parentheses: {
-    beautify = {
-        ecma: 6
-    }
-    input: {
-        ({a, b} = {a: 1, b: 2});
-    }
-    expect_exact: "({a,b}={a:1,b:2});"
-}
-
-destructuring_with_undefined_as_default_assignment: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        [foo = undefined] = bar;
-        [foo = void 0] = bar;
-    }
-    expect: {
-        [foo] = bar;
-        [foo] = bar;
-    }
-}
-
-destructuring_dont_evaluate_with_undefined_as_default_assignment: {
-    options = {
-        evaluate: false
-    }
-    input: {
-        [foo = undefined] = bar;
-    }
-    expect: {
-        [foo = void 0] = bar;
-    }
-}
-
-reduce_vars: {
-    options = {
-        reduce_vars: true,
-    }
-    input: {
-        {const [aa, [bb, cc]] = dd;}
-        {let [aa, [bb, cc]] = dd;}
-        var [aa, [bb, cc]] = dd;
-        [aa, [bb, cc]] = dd;
-        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
-        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
-        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
-        ({aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}});
-        const [{a},b] = c;
-        let [{d},e] = f;
-        var [{g},h] = i;
-        [{a},b] = c;
-        for (const [x,y] in pairs);
-        for (let [x,y] in pairs);
-        for (var [x,y] in pairs);
-        for ([x,y] in pairs);
-    }
-    expect: {
-        {const [aa, [bb, cc]] = dd;}
-        {let [aa, [bb, cc]] = dd;}
-        var [aa, [bb, cc]] = dd;
-        [aa, [bb, cc]] = dd;
-        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
-        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
-        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
-        ({aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}});
-        const [{a},b] = c;
-        let [{d},e] = f;
-        var [{g},h] = i;
-        [{a},b] = c;
-        for (const [x,y] in pairs);
-        for (let [x,y] in pairs);
-        for (var [x,y] in pairs);
-        for ([x,y] in pairs);
-    }
-}
-
-unused: {
-    options = {
-        unused: true,
-    }
-    input: {
-        let { foo: [, , ...a] } = { foo: [1, 2, 3, 4], bar: 5 };
-        console.log(a);
-    }
-    expect: {
-        let { foo: [, , ...a] } = { foo: [1, 2, 3, 4], bar: 5 };
-        console.log(a);
-    }
-}
-
-issue_1886: {
-    options = {
-        collapse_vars: true,
-    }
-    input: {
-        let [a] = [1];
-        console.log(a);
-    }
-    expect: {
-        let [a] = [1];
-        console.log(a);
-    }
-}
-
-destructuring_decl_of_numeric_key: {
-    options = {
-        evaluate: true,
-        unused: true,
-    }
-    input: {
-        let { 3: x } = { [1 + 2]: 42 };
-        console.log(x);
-    }
-    expect: {
-        let { 3: x } = { [3]: 42 };
-        console.log(x);
-    }
-    expect_stdout: "42"
-    node_version: ">=6"
-}
-
-destructuring_decl_of_computed_key: {
-    options = {
-        evaluate: true,
-        unused: true,
-    }
-    input: {
-        let four = 4;
-        let { [7 - four]: x } = { [1 + 2]: 42 };
-        console.log(x);
-    }
-    expect: {
-        let four = 4;
-        let { [7 - four]: x } = { [3]: 42 };
-        console.log(x);
-    }
-    expect_stdout: "42"
-    node_version: ">=6"
-}
-
-destructuring_assign_of_numeric_key: {
-    options = {
-        evaluate: true,
-        unused: true,
-    }
-    input: {
-        let x;
-        ({ 3: x } = { [1 + 2]: 42 });
-        console.log(x);
-    }
-    expect: {
-        let x;
-        ({ 3: x } = { [3]: 42 });
-        console.log(x);
-    }
-    expect_stdout: "42"
-    node_version: ">=6"
-}
-
-destructuring_assign_of_computed_key: {
-    options = {
-        evaluate: true,
-        unused: true,
-    }
-    input: {
-        let x;
-        let four = 4;
-        ({ [(5 + 2) - four]: x } = { [1 + 2]: 42 });
-        console.log(x);
-    }
-    expect: {
-        let x;
-        let four = 4;
-        ({ [7 - four]: x } = { [3]: 42 });
-        console.log(x);
-    }
-    expect_stdout: "42"
-    node_version: ">=6"
-}
-
-mangle_destructuring_decl: {
-    options = {
-        evaluate: true,
-        unused: true,
-    }
-    mangle = {
-    }
-    input: {
-        function test(opts) {
-            let a = opts.a || { e: 7, n: 8 };
-            let { t, e, n, s =  5 + 4, o, r } = a;
-            console.log(t, e, n, s, o, r);
-        }
-        test({a: { t: 1, e: 2, n: 3, s: 4, o: 5, r: 6 }});
-        test({});
-    }
-    expect: {
-        function test(t) {
-            let e = t.a || { e: 7, n: 8 };
-            let {t: n,  e: o,  n: s,  s: l = 9,  o: a,  r: c} = e;
-            console.log(n, o, s, l, a, c);
-        }
-        test({ a: { t: 1, e: 2, n: 3, s: 4, o: 5, r: 6 } });
-        test({});
-    }
-    expect_stdout: [
-        "1 2 3 4 5 6",
-        "undefined 7 8 9 undefined undefined",
-    ]
-    node_version: ">=6"
-}
-
-mangle_destructuring_assign_toplevel_true: {
-    options = {
-        toplevel: true,
-        evaluate: true,
-        unused: true,
-    }
-    mangle = {
-        toplevel: true,
-    }
-    beautify = {
-        ecma: 6
-    }
-    input: {
-        function test(opts) {
-            let s, o, r;
-            let a = opts.a || { e: 7, n: 8 };
-            ({ t, e, n, s =  5 + 4, o, r } = a);
-            console.log(t, e, n, s, o, r);
-        }
-        let t, e, n;
-        test({a: { t: 1, e: 2, n: 3, s: 4, o: 5, r: 6 }});
-        test({});
-    }
-    expect: {
-        function e(e) {
-            let l, s, a;
-            let c = e.a || { e: 7, n: 8 };
-            ({t: n,  e: o,  n: t,  s: l = 9,  o: s,  r: a} = c);
-            console.log(n, o, t, l, s, a);
-        }
-        let n, o, t;
-        e({ a: { t: 1, e: 2, n: 3, s: 4, o: 5, r: 6 } });
-        e({});
-    }
-    expect_stdout: [
-        "1 2 3 4 5 6",
-        "undefined 7 8 9 undefined undefined",
-    ]
-    node_version: ">=6"
-}
-
-mangle_destructuring_assign_toplevel_false: {
-    options = {
-        toplevel: false,
-        evaluate: true,
-        unused: true,
-    }
-    mangle = {
-        toplevel: false,
-    }
-    beautify = {
-        ecma: 6
-    }
-    input: {
-        function test(opts) {
-            let s, o, r;
-            let a = opts.a || { e: 7, n: 8 };
-            ({ t, e, n, s = 9, o, r } = a);
-            console.log(t, e, n, s, o, r);
-        }
-        let t, e, n;
-        test({a: { t: 1, e: 2, n: 3, s: 4, o: 5, r: 6 }});
-        test({});
-    }
-    expect: {
-        function test(o) {
-            let s, l, a;
-            let c = o.a || { e: 7, n: 8 };
-            ({t,  e,  n,  s = 9,  o: l,  r: a} = c);
-            console.log(t, e, n, s, l, a);
-        }
-        let t, e, n;
-        test({ a: { t: 1, e: 2, n: 3, s: 4, o: 5, r: 6 } });
-        test({});
-    }
-    expect_stdout: [
-        "1 2 3 4 5 6",
-        "undefined 7 8 9 undefined undefined",
-    ]
-    node_version: ">=6"
-}
-
-mangle_destructuring_decl_array: {
-    options = {
-        evaluate: true,
-        unused: true,
-        toplevel: true,
-    }
-    mangle = {
-        toplevel: true,
-    }
-    beautify = {
-        ecma: 6
-    }
-    input: {
-        var [, t, e, n, s, o = 2, r = [ 1 + 2 ]] = [ 9, 8, 7, 6 ];
-        console.log(t, e, n, s, o, r);
-    }
-    expect: {
-        var [, o,  l,  a,  c,  e = 2,  g = [ 3 ]] = [ 9, 8, 7, 6 ];
-        console.log(o, l, a, c, e, g);
-    }
-    expect_stdout: "8 7 6 undefined 2 [ 3 ]"
-    node_version: ">=6"
-}
-
-anon_func_with_destructuring_args: {
-    options = {
-        evaluate: true,
-        unused: true,
-        toplevel: true,
-    }
-    mangle = {
-        toplevel: true,
-    }
-    beautify = {
-        ecma: 5,
-    }
-    input: {
-        (function({foo = 1 + 0, bar = 2}, [car = 3, far = 4]) {
-            console.log(foo, bar, car, far);
-        })({bar: 5 - 0}, [, 6]);
-    }
-    expect: {
-        (function({foo: o = 1, bar: n = 2}, [a = 3, b = 4]) {
-            console.log(o, n, a, b);
-        })({bar: 5}, [, 6]);
-    }
-    expect_stdout: "1 5 3 6"
-    node_version: ">=6"
-}
-
-arrow_func_with_destructuring_args: {
-    options = {
-        evaluate: true,
-        unused: true,
-        toplevel: true,
-    }
-    mangle = {
-        toplevel: true,
-    }
-    beautify = {
-        ecma: 5,
-    }
-    input: {
-        (({foo = 1 + 0, bar = 2}, [car = 3, far = 4]) => {
-            console.log(foo, bar, car, far);
-        })({bar: 5 - 0}, [, 6]);
-    }
-    expect: {
-        (({foo: o = 1, bar: a = 2}, [b = 3, l = 4]) => {
-            console.log(o, a, b, l);
-        })({bar: 5}, [, 6]);
-    }
-    expect_stdout: "1 5 3 6"
-    node_version: ">=6"
-}
-
-issue_2044_ecma_5: {
-    beautify = {
-        beautify: false,
-        ecma: 5,
-    }
-    input: {
-        ({x : a = 1, y = 2 + b, z = 3 - c} = obj);
-    }
-    expect_exact: "({x:a=1,y:y=2+b,z:z=3-c}=obj);"
-}
-
-issue_2044_ecma_6: {
-    beautify = {
-        beautify: false,
-        ecma: 6,
-    }
-    input: {
-        ({x : a = 1, y = 2 + b, z = 3 - c} = obj);
-    }
-    expect_exact: "({x:a=1,y=2+b,z=3-c}=obj);"
-}
-
-issue_2044_ecma_5_beautify: {
-    beautify = {
-        beautify: true,
-        ecma: 5,
-    }
-    input: {
-        ({x : a = 1, y = 2 + b, z = 3 - c} = obj);
-    }
-    expect_exact: "({x: a = 1, y: y = 2 + b, z: z = 3 - c} = obj);"
-}
-
-issue_2044_ecma_6_beautify: {
-    beautify = {
-        beautify: true,
-        ecma: 6,
-    }
-    input: {
-        ({x : a = 1, y = 2 + b, z = 3 - c} = obj);
-    }
-    expect_exact: "({x: a = 1, y = 2 + b, z = 3 - c} = obj);"
-}
-
-issue_2140: {
-    options = {
-        unused: true,
-    }
-    input: {
-        !function() {
-            var t = {};
-            console.log(([t.a] = [42])[0]);
-        }();
-    }
-    expect: {
-        !function() {
-            var t = {};
-            console.log(([t.a] = [42])[0]);
-        }();
-    }
-    expect_stdout: "42"
-    node_version: ">=6"
-}

test/compress/directives.js

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

test/compress/evaluate.js

@@ -1,6 +1,7 @@
 and: {
     options = {
-        evaluate: true
+        evaluate: true,
+        side_effects: true,
     }
     input: {
         var a;
@@ -76,7 +77,8 @@ and: {
 
 or: {
     options = {
-        evaluate: true
+        evaluate: true,
+        side_effects: true,
     }
     input: {
         var a;
@@ -158,7 +160,8 @@ or: {
 
 unary_prefix: {
     options = {
-        evaluate: true
+        evaluate: true,
+        side_effects: true,
     }
     input: {
         a = !0 && b;
@@ -224,100 +227,6 @@ positive_zero: {
     expect_stdout: true
 }
 
-pow: {
-    options = { evaluate: true }
-    input: {
-        var a = 5 ** 3;
-    }
-    expect: {
-        var a = 125;
-    }
-}
-
-pow_sequence: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        var a = 2 ** 3 ** 2;
-    }
-    expect: {
-        var a = 512;
-    }
-}
-
-pow_mixed: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        var a = 5 + 2 ** 3 + 5;
-        var b = 5 * 3 ** 2;
-        var c = 5 ** 3 * 2;
-        var d = 5 ** +3;
-    }
-    expect: {
-        var a = 18;
-        var b = 45;
-        var c = 250;
-        var d = 125;
-    }
-}
-
-pow_with_right_side_evaluating_to_unary: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        var a = (4 - 7) ** foo;
-        var b = ++bar ** 3;
-        var c = --baz ** 2;
-    }
-    expect_exact: "var a=(-3)**foo;var b=++bar**3;var c=--baz**2;"
-}
-
-pow_with_number_constants: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        var a = 5 ** NaN;
-        /* NaN exponent results to NaN */
-        var b = 42 ** +0;
-        /* +0 exponent results to NaN */
-        var c = 42 ** -0;
-        /* -0 exponent results to NaN */
-        var d = NaN ** 1;
-        /* NaN with non-zero exponent is NaN */
-        var e = 2 ** Infinity;
-        /* abs(base) > 1 with Infinity as exponent is Infinity */
-        var f = 2 ** -Infinity;
-        /* abs(base) > 1 with -Infinity as exponent is +0 */
-        var g = (-7) ** (0.5);
-        var h = 2324334 ** 34343443;
-        var i = (-2324334) ** 34343443;
-        var j = 2 ** (-3);
-        var k = 2.0 ** -3;
-        var l = 2.0 ** (5 - 7);
-        var m = 3 ** -10;  // Result will be 0.000016935087808430286, which is too long
-    }
-    expect: {
-        var a = NaN;
-        var b = 1;
-        var c = 1;
-        var d = NaN;
-        var e = 1/0;
-        var f = 0;
-        var g = NaN;
-        var h = 1/0;
-        var i = -1/0;
-        var j = .125;
-        var k = .125;
-        var l = .25;
-        var m = 3 ** -10;
-    }
-}
-
 unsafe_constant: {
     options = {
         evaluate  : true,
@@ -345,6 +254,7 @@ unsafe_constant: {
 unsafe_object: {
     options = {
         evaluate: true,
+        reduce_funcs: true,
         reduce_vars: true,
         toplevel: true,
         unsafe: true,
@@ -373,6 +283,7 @@ unsafe_object: {
 unsafe_object_nested: {
     options = {
         evaluate: true,
+        reduce_funcs: true,
         reduce_vars: true,
         toplevel: true,
         unsafe: true,
@@ -401,6 +312,7 @@ unsafe_object_nested: {
 unsafe_object_complex: {
     options = {
         evaluate: true,
+        reduce_funcs: true,
         reduce_vars: true,
         toplevel: true,
         unsafe: true,
@@ -429,6 +341,7 @@ unsafe_object_complex: {
 unsafe_object_repeated: {
     options = {
         evaluate: true,
+        reduce_funcs: true,
         reduce_vars: true,
         toplevel: true,
         unsafe: true,
@@ -457,6 +370,7 @@ unsafe_object_repeated: {
 unsafe_object_accessor: {
     options = {
         evaluate: true,
+        reduce_funcs: true,
         reduce_vars: true,
         unsafe: true,
     }
@@ -480,10 +394,11 @@ unsafe_object_accessor: {
     }
 }
 
-unsafe_function: {
+prop_function: {
     options = {
-        evaluate  : true,
-        unsafe    : true
+        evaluate: true,
+        properties: true,
+        side_effects: true,
     }
     input: {
         console.log(
@@ -496,9 +411,9 @@ unsafe_function: {
     expect: {
         console.log(
             ({a:{b:1},b:function(){}}) + 1,
-            ({b:function(){}}, {b:1}) + 1,
-            ({a:{b:1}}, function(){}) + 1,
-            ({b:function(){}}, {b:1}).b + 1
+            ({b:1}) + 1,
+            function(){} + 1,
+            2
         );
     }
     expect_stdout: true
@@ -724,10 +639,11 @@ unsafe_string_bad_index: {
     expect_stdout: true
 }
 
-unsafe_prototype_function: {
+prototype_function: {
     options = {
-        evaluate  : true,
-        unsafe    : true
+        evaluate: true,
+        properties: true,
+        side_effects: true,
     }
     input: {
         var a = ({valueOf: 0}) < 1;
@@ -746,8 +662,8 @@ unsafe_prototype_function: {
         var d = ({toString: 0}) + "";
         var e = (({valueOf: 0}) + "")[2];
         var f = (({toString: 0}) + "")[2];
-        var g = ({}, 0)();
-        var h = ({}, 0)();
+        var g = 0();
+        var h = 0();
     }
 }
 
@@ -755,17 +671,19 @@ call_args: {
     options = {
         evaluate: true,
         inline: true,
+        reduce_funcs: true,
         reduce_vars: true,
+        toplevel: true,
     }
     input: {
-        const a = 1;
+        var a = 1;
         console.log(a);
         +function(a) {
             return a;
         }(a);
     }
     expect: {
-        const a = 1;
+        var a = 1;
         console.log(1);
         +(1, 1);
     }
@@ -777,18 +695,19 @@ call_args_drop_param: {
         evaluate: true,
         inline: true,
         keep_fargs: false,
+        reduce_funcs: true,
         reduce_vars: true,
+        toplevel: true,
         unused: true,
     }
     input: {
-        const a = 1;
+        var a = 1;
         console.log(a);
         +function(a) {
             return a;
         }(a, b);
     }
     expect: {
-        const a = 1;
         console.log(1);
         +(b, 1);
     }
@@ -1107,6 +1026,7 @@ Infinity_NaN_undefined_LHS: {
 issue_1964_1: {
     options = {
         evaluate: true,
+        reduce_funcs: true,
         reduce_vars: true,
         unsafe_regexp: false,
         unused: true,
@@ -1114,6 +1034,7 @@ issue_1964_1: {
     input: {
         function f() {
             var long_variable_name = /\s/;
+            console.log(long_variable_name.source);
             return "a b c".split(long_variable_name)[1];
         }
         console.log(f());
@@ -1121,16 +1042,21 @@ issue_1964_1: {
     expect: {
         function f() {
             var long_variable_name = /\s/;
+            console.log(long_variable_name.source);
             return "a b c".split(long_variable_name)[1];
         }
         console.log(f());
     }
-    expect_stdout: "b"
+    expect_stdout: [
+        "\\s",
+        "b",
+    ]
 }
 
 issue_1964_2: {
     options = {
         evaluate: true,
+        reduce_funcs: true,
         reduce_vars: true,
         unsafe_regexp: true,
         unused: true,
@@ -1138,17 +1064,22 @@ issue_1964_2: {
     input: {
         function f() {
             var long_variable_name = /\s/;
+            console.log(long_variable_name.source);
             return "a b c".split(long_variable_name)[1];
         }
         console.log(f());
     }
     expect: {
         function f() {
+            console.log(/\s/.source);
             return "a b c".split(/\s/)[1];
         }
         console.log(f());
     }
-    expect_stdout: "b"
+    expect_stdout: [
+        "\\s",
+        "b",
+    ]
 }
 
 array_slice_index: {
@@ -1263,6 +1194,9 @@ issue_2231_1: {
         console.log(Object.keys(void 0));
     }
     expect_stdout: true
+    expect_warnings: [
+        "WARN: Error evaluating Object.keys(void 0) [test/compress/evaluate.js:1191,20]",
+    ]
 }
 
 issue_2231_2: {
@@ -1277,4 +1211,281 @@ issue_2231_2: {
         console.log(Object.getOwnPropertyNames(null));
     }
     expect_stdout: true
+    expect_warnings: [
+        "WARN: Error evaluating Object.getOwnPropertyNames(null) [test/compress/evaluate.js:1208,20]",
+    ]
+}
+
+issue_2231_3: {
+    options = {
+        evaluate: true,
+        unsafe: true,
+    }
+    input: {
+        console.log(Object.keys({ foo: "bar" })[0]);
+    }
+    expect: {
+        console.log("foo");
+    }
+    expect_stdout: "foo"
+}
+
+self_comparison_1: {
+    options = {
+        evaluate: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unsafe: true,
+        unused: true,
+    }
+    input: {
+        var o = { n: NaN };
+        console.log(o.n == o.n, o.n === o.n, o.n != o.n, o.n !== o.n, typeof o.n);
+    }
+    expect: {
+        console.log(false, false, true, true, "number");
+    }
+    expect_stdout: "false false true true 'number'"
+}
+
+self_comparison_2: {
+    options = {
+        evaluate: true,
+        hoist_props: true,
+        passes: 2,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = { n: NaN };
+        console.log(o.n == o.n, o.n === o.n, o.n != o.n, o.n !== o.n, typeof o.n);
+    }
+    expect: {
+        console.log(false, false, true, true, "number");
+    }
+    expect_stdout: "false false true true 'number'"
+}
+
+issue_2535_1: {
+    options = {
+        booleans: true,
+        evaluate: true,
+        sequences: true,
+        side_effects: true,
+    }
+    input: {
+        if ((x() || true) || y()) z();
+        if ((x() || true) && y()) z();
+        if ((x() && true) || y()) z();
+        if ((x() && true) && y()) z();
+        if ((x() || false) || y()) z();
+        if ((x() || false) && y()) z();
+        if ((x() && false) || y()) z();
+        if ((x() && false) && y()) z();
+    }
+    expect: {
+        if (x(), 1) z();
+        if (x(), y()) z();
+        if (x() || y()) z();
+        if (x() && y()) z();
+        if (x() || y()) z();
+        if (x() && y()) z();
+        if (x(), y()) z();
+        if (x(), 0) z();
+    }
+}
+
+issue_2535_2: {
+    options = {
+        booleans: true,
+        evaluate: true,
+        sequences: true,
+        side_effects: true,
+    }
+    input: {
+        (x() || true) || y();
+        (x() || true) && y();
+        (x() && true) || y();
+        (x() && true) && y();
+        (x() || false) || y();
+        (x() || false) && y();
+        (x() && false) || y();
+        (x() && false) && y();
+    }
+    expect: {
+        x(),
+        x(), y(),
+        x() || y(),
+        x() && y(),
+        x() || y(),
+        x() && y(),
+        x(), y(),
+        x();
+    }
+}
+
+issue_2535_3: {
+    options = {
+        booleans: true,
+        evaluate: true,
+    }
+    input: {
+        console.log(Object(1) && 1 && 2);
+        console.log(Object(1) && true && 1 && 2 && Object(2));
+        console.log(Object(1) && true && 1 && null && 2 && Object(2));
+        console.log(2 == Object(1) || 0 || void 0 || null);
+        console.log(2 == Object(1) || 0 || void 0 || null || Object(2));
+        console.log(2 == Object(1) || 0 || void 0 || "ok" || null || Object(2));
+    }
+    expect: {
+        console.log(Object(1) && 2);
+        console.log(Object(1) && Object(2));
+        console.log(Object(1) && null);
+        console.log(2 == Object(1) || null);
+        console.log(2 == Object(1) || Object(2));
+        console.log(2 == Object(1) || "ok");
+    }
+    expect_stdout: true
+    expect_warnings: [
+        "WARN: Dropping side-effect-free && [test/compress/evaluate.js:1336,20]",
+        "WARN: Dropping side-effect-free && [test/compress/evaluate.js:1337,20]",
+        "WARN: Dropping side-effect-free && [test/compress/evaluate.js:1338,20]",
+        "WARN: Condition left of && always false [test/compress/evaluate.js:1338,20]",
+        "WARN: Dropping side-effect-free || [test/compress/evaluate.js:1339,20]",
+        "WARN: Dropping side-effect-free || [test/compress/evaluate.js:1340,20]",
+        "WARN: Dropping side-effect-free || [test/compress/evaluate.js:1341,20]",
+        "WARN: Condition left of || always true [test/compress/evaluate.js:1341,20]",
+    ]
+}
+
+issue_2822: {
+    options = {
+        evaluate: true,
+        unsafe: true,
+    }
+    input: {
+        console.log([ function() {}, "PASS", "FAIL" ][1]);
+    }
+    expect: {
+        console.log("PASS");
+    }
+    expect_stdout: "PASS"
+}
+
+string_case: {
+    options = {
+        evaluate: true,
+        unsafe: true,
+    }
+    input: {
+        console.log("İ".toLowerCase().charCodeAt(0));
+        console.log("I".toLowerCase().charCodeAt(0));
+        console.log("Ş".toLowerCase().charCodeAt(0));
+        console.log("Ğ".toLowerCase().charCodeAt(0));
+        console.log("Ü".toLowerCase().charCodeAt(0));
+        console.log("Ö".toLowerCase().charCodeAt(0));
+        console.log("Ç".toLowerCase().charCodeAt(0));
+        console.log("i".toUpperCase().charCodeAt(0));
+        console.log("ı".toUpperCase().charCodeAt(0));
+        console.log("ş".toUpperCase().charCodeAt(0));
+        console.log("ğ".toUpperCase().charCodeAt(0));
+        console.log("ü".toUpperCase().charCodeAt(0));
+        console.log("ö".toUpperCase().charCodeAt(0));
+        console.log("ç".toUpperCase().charCodeAt(0));
+    }
+    expect: {
+        console.log(105);
+        console.log(105);
+        console.log(351);
+        console.log(287);
+        console.log(252);
+        console.log(246);
+        console.log(231);
+        console.log(73);
+        console.log(73);
+        console.log(350);
+        console.log(286);
+        console.log(220);
+        console.log(214);
+        console.log(199);
+    }
+    expect_stdout: [
+        "105",
+        "105",
+        "351",
+        "287",
+        "252",
+        "246",
+        "231",
+        "73",
+        "73",
+        "350",
+        "286",
+        "220",
+        "214",
+        "199",
+    ]
+}
+
+issue_2916_1: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        unsafe: true,
+    }
+    input: {
+        var c = "PASS";
+        (function(a, b) {
+            (function(d) {
+                d[0] = 1;
+            })(b);
+            a == b && (c = "FAIL");
+        })("", []);
+        console.log(c);
+    }
+    expect: {
+        var c = "PASS";
+        (function(a, b) {
+            (function(d) {
+                d[0] = 1;
+            })(b);
+            a == b && (c = "FAIL");
+        })("", []);
+        console.log(c);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_2916_2: {
+    options = {
+        collapse_vars: true,
+        evaluate: true,
+        inline: true,
+        reduce_vars: true,
+        side_effects: true,
+        unsafe: true,
+        unused: true,
+    }
+    input: {
+        var c = "FAIL";
+        (function(b) {
+            (function(d) {
+                d[0] = 1;
+            })(b);
+            +b && (c = "PASS");
+        })([]);
+        console.log(c);
+    }
+    expect: {
+        var c = "FAIL";
+        (function(b) {
+            b[0] = 1;
+            +b && (c = "PASS");
+        })([]);
+        console.log(c);
+    }
+    expect_stdout: "PASS"
 }

test/compress/expansions.js

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

test/compress/export.js

@@ -1,228 +0,0 @@
-issue_2038_1: {
-    options = {
-        toplevel: true,
-        unused: true,
-    }
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        export var V = 1;
-        export let L = 2;
-        export const C = 3;
-    }
-    expect: {
-        export var V = 1;
-        export let L = 2;
-        export const C = 3;
-    }
-}
-
-issue_2038_2: {
-    options = {
-        toplevel: true,
-        unused: true,
-    }
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        let LET = 1;
-        const CONST = 2;
-        var VAR = 3;
-        export { LET, CONST, VAR };
-    }
-    expect: {
-        let t = 1;
-        const e = 2;
-        var o = 3;
-        export { t as LET, e as CONST, o as VAR };
-    }
-}
-
-issue_2126: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        import { foo as bar, cat as dog } from "stuff";
-        console.log(bar, dog);
-        export { bar as qux };
-        export { dog };
-    }
-    expect: {
-        import { foo as o, cat as s } from "stuff";
-        console.log(o, s);
-        export { o as qux };
-        export { s as dog };
-    }
-}
-
-beautify: {
-    beautify = {
-        beautify: true,
-    }
-    input: {
-        export { A as B, C as D };
-    }
-    expect_exact: "export { A as B, C as D };"
-}
-
-issue_2131: {
-    options = {
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        function no() {
-            console.log(42);
-        }
-        function go() {
-            console.log(42);
-        }
-        var X = 1, Y = 2;
-        export function main() {
-            go(X);
-        };
-    }
-    expect: {
-        function go() {
-            console.log(42);
-        }
-        var X = 1;
-        export function main() {
-            go(X);
-        };
-    }
-}
-
-issue_2129: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        export const { keys } = Object;
-    }
-    expect: {
-        export const { keys } = Object;
-    }
-}
-
-async_func: {
-    options = {
-        keep_fargs: false,
-        unused: true,
-    }
-    input: {
-        export async function Foo(x){};
-    }
-    expect: {
-        export async function Foo(){};
-    }
-}
-
-issue_2134_1: {
-    options = {
-        keep_fargs: false,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        export function Foo(x){};
-        Foo.prototype = {};
-    }
-    expect: {
-        export function Foo(){};
-        Foo.prototype = {};
-    }
-}
-
-issue_2134_2: {
-    options = {
-        keep_fargs: false,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        export async function Foo(x){};
-        Foo.prototype = {};
-    }
-    expect: {
-        export async function Foo(){};
-        Foo.prototype = {};
-    }
-}
-
-redirection: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        let foo = 1, bar = 2;
-        export { foo as delete };
-        export { bar as default };
-        export { foo as var } from "module.js";
-    }
-    expect: {
-        let e = 1, o = 2;
-        export { e as delete };
-        export { o as default };
-        export { foo as var } from "module.js";
-    }
-}
-
-keyword_invalid_1: {
-    input: {
-        export { default };
-    }
-    expect: {
-        export { default };
-    }
-}
-
-keyword_invalid_2: {
-    input: {
-        export { default as Alias };
-    }
-    expect: {
-        export { default as Alias };
-    }
-}
-
-keyword_invalid_3: {
-    input: {
-        export { default as default };
-    }
-    expect: {
-        export { default as default };
-    }
-}
-
-keyword_valid_1: {
-    input: {
-        export { default } from "module.js";
-    }
-    expect: {
-        export { default } from "module.js";
-    }
-}
-
-keyword_valid_2: {
-    input: {
-        export { default as Alias } from "module.js";
-    }
-    expect: {
-        export { default as Alias } from "module.js";
-    }
-}
-
-keyword_valid_3: {
-    input: {
-        export { default as default } from "module.js";
-    }
-    expect: {
-        export { default as default } from "module.js";
-    }
-}

test/compress/expression.js

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

test/compress/global_defs.js

@@ -121,7 +121,7 @@ mixed: {
         properties: true,
     }
     input: {
-        const FOO = { BAR: 0 };
+        var FOO = { BAR: 0 };
         console.log(FOO.BAR);
         console.log(++CONFIG.DEBUG);
         console.log(++CONFIG.VALUE);
@@ -131,7 +131,7 @@ mixed: {
         console.log(CONFIG);
     }
     expect: {
-        const FOO = { BAR: 0 };
+        var FOO = { BAR: 0 };
         console.log("moo");
         console.log(++CONFIG.DEBUG);
         console.log(++CONFIG.VALUE);
@@ -184,6 +184,7 @@ issue_2167: {
         global_defs: {
             "@isDevMode": "function(){}",
         },
+        passes: 2,
         side_effects: true,
     }
     input: {

test/compress/harmony.js

@@ -1,806 +0,0 @@
-arrow_function_parens: {
-    input: {
-        something && (() => {});
-    }
-    expect_exact: "something&&(()=>{});"
-}
-arrow_function_parens_2: {
-    input: {
-        (() => null)();
-    }
-    expect_exact: "(()=>null)();"
-}
-
-typeof_arrow_functions: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        var foo = typeof (x => null);
-        console.log(foo);
-    }
-    expect_exact: "var foo=\"function\";console.log(foo);"
-    expect_stdout: "function"
-    node_version: ">=4"
-}
-
-classes: {
-    input: {
-        class SomeClass {
-            constructor() {
-            };
-            foo() {};
-        };
-        class NoSemi {
-            constructor(...args) {
-            }
-            foo() {}
-        };
-        class ChildClass extends SomeClass {};
-        var asExpression = class AsExpression {};
-        var nameless = class {};
-    }
-    expect_exact: "class SomeClass{constructor(){}foo(){}}class NoSemi{constructor(...args){}foo(){}}class ChildClass extends SomeClass{}var asExpression=class AsExpression{};var nameless=class{};"
-}
-
-class_statics: {
-    input: {
-        x = class {
-            static staticMethod() {}
-            static get foo() {}
-            static set bar() {}
-            static() { /* "static" can be a method name! */ }
-            get() { /* "get" can be a method name! */ }
-            set() { /* "set" can be a method name! */ }
-        }
-    }
-    expect_exact: "x=class{static staticMethod(){}static get foo(){}static set bar(){}static(){}get(){}set(){}};"
-}
-
-class_name_can_be_mangled: {
-    mangle = { };
-    input: {
-        function x() {
-            class Foo {
-            }
-            var class1 = Foo;
-            var class2 = class Bar {};
-        }
-    }
-    expect: {
-        function x() {
-            class a { }
-            var s = a;
-            var c = class a {};
-        }
-    }
-}
-
-class_name_can_be_preserved: {
-    mangle = {
-        keep_classnames: true
-    }
-    input: {
-        function x() {
-            (class Baz { });
-            class Foo {};
-        }
-    }
-    expect: {
-        function x() {
-            (class Baz { });
-            class Foo {};
-        }
-    }
-}
-
-classes_can_have_generators: {
-    input: {
-        class Foo {
-            *bar() {}
-            static *baz() {}
-        }
-    }
-    expect: {
-        class Foo {
-            *bar() {}
-            static *baz() {}
-        }
-    }
-}
-
-classes_can_have_computed_generators: {
-    input: {
-        class C4 {
-            *['constructor']() {}
-        }
-    }
-    expect: {
-        class C4 {
-            *['constructor']() {}
-        }
-    }
-}
-
-classes_can_have_computed_static: {
-    input: {
-        class C4 {
-            static ['constructor']() {}
-        }
-    }
-    expect: {
-        class C4 {
-            static ['constructor']() {}
-        }
-    }
-}
-
-class_methods_and_getters_with_keep_quoted_props_enabled: {
-    beautify = {
-        quote_style: 3,
-        keep_quoted_props: true,
-    }
-    input: {
-        class clss {
-            a() {}
-            "b"() {}
-            get c() { return "c"}
-            get "d"() { return "d"}
-            set e(a) { doSomething(a); }
-            set 'f'(a) { doSomething(b); }
-            static g() {}
-            static "h"() {}
-        }
-    }
-    expect_exact: 'class clss{a(){}"b"(){}get c(){return"c"}get"d"(){return"d"}set e(a){doSomething(a)}set\'f\'(a){doSomething(b)}static g(){}static"h"(){}}'
-}
-
-classes_with_expression_as_expand: {
-    input: {
-        class D extends (calls++, C) {}
-    }
-    expect_exact: "class D extends(calls++,C){}"
-}
-
-new_target: {
-    input: {
-        new.target;
-        new.target.name;
-    }
-    expect_exact: "new.target;new.target.name;"
-}
-
-number_literals: {
-    input: {
-        0b1001;
-        0B1001;
-        0o11;
-        0O11;
-    }
-
-    expect: {
-        9;
-        9;
-        9;
-        9;
-    }
-}
-
-import_statement: {
-    input: {
-        import "mod-name";
-        import Foo from "bar";
-        import { Bar, Baz } from 'lel';
-        import Bar, { Foo } from 'lel';
-        import { Bar as kex, Baz as food } from 'lel';
-    }
-    expect_exact: 'import"mod-name";import Foo from"bar";import{Bar,Baz}from"lel";import Bar,{Foo}from"lel";import{Bar as kex,Baz as food}from"lel";'
-}
-
-import_all_statement: {
-    input: {
-        import * from 'lel';
-        import * as Lel from 'lel';
-    }
-    expect_exact: 'import*from"lel";import*as Lel from"lel";'
-}
-
-export_statement: {
-    options = {
-        evaluate: true,
-    }
-    input: {
-        export default 1 + 2;
-        export var a = 4;
-        export let b = 6;
-        export const c = 6;
-        export function d() {};
-        export class e {};
-    }
-    expect_exact: "export default 3;export var a=4;export let b=6;export const c=6;export function d(){};export class e{};"
-}
-
-export_default_object_expression: {
-    options = {
-        evaluate: true,
-    }
-    input: {
-        export default {
-            foo: 1 + 2,
-            bar() { return 4; },
-            get baz() { return this.foo; },
-        };
-    }
-    expect_exact: "export default{foo:3,bar(){return 4},get baz(){return this.foo}};"
-}
-
-export_default_array: {
-    options = {
-        evaluate: true,
-    }
-    input: {
-        export default [ 1 + 2, foo ];
-    }
-    expect_exact: "export default[3,foo];"
-}
-
-export_default_anon_function: {
-    options = {
-        evaluate: true,
-    }
-    input: {
-        export default function(){
-            console.log(1 + 2);
-        }
-    }
-    expect_exact: "export default function(){console.log(3)};"
-}
-
-export_default_anon_class: {
-    options = {
-        evaluate: true,
-    }
-    input: {
-        export default class {
-            foo() { console.log(1 + 2); }
-        }
-    }
-    expect_exact: "export default class{foo(){console.log(3)}};"
-}
-
-export_module_statement: {
-    input: {
-        export * from "a.js";
-        export {A} from "a.js";
-        export {A, B} from "a.js";
-        export {C};
-    }
-    expect_exact: 'export*from"a.js";export{A}from"a.js";export{A,B}from"a.js";export{C};'
-}
-
-import_statement_mangling: {
-    mangle = { toplevel: true };
-    input: {
-        import Foo from "foo";
-        import Bar, {Food} from "lel";
-        import {What as Whatever} from "lel";
-        Foo();
-        Bar();
-        Food();
-        Whatever();
-    }
-    expect: {
-        import o from "foo";
-        import m, {Food as r} from "lel";
-        import {What as f} from "lel";
-        o();
-        m();
-        r();
-        f();
-    }
-}
-
-export_statement_mangling: {
-    mangle = { };
-    input: {
-        export var foo = 6;
-        export function bar() { }
-        export class Baz { }
-        bar(foo, Baz)
-    }
-    expect: {
-        export var foo = 6;
-        export function bar() { }
-        export class Baz { }
-        bar(foo, Baz)
-    }
-}
-
-// https://github.com/mishoo/UglifyJS2/issues/1021
-regression_for_of_const: {
-    input: {
-        for (const x of y) {}
-        for (const x in y) {}
-    }
-    expect: {
-        for (const x of y);for (const x in y);
-    }
-}
-
-// Fabio: My patches accidentally caused a crash whenever
-// there's an extraneous set of parens around an object.
-regression_cannot_destructure: {
-    input: {
-        var x = ({ x : 3 });
-        x(({ x: 3 }));
-    }
-    expect_exact: "var x={x:3};x({x:3});";
-}
-
-regression_cannot_use_of: {
-    input: {
-        function of() {
-        }
-        var of = "is a valid variable name";
-        of = { of: "is ok" };
-        x.of;
-        of: foo()
-    }
-    expect: {
-        function of(){}
-        var of="is a valid variable name";
-        of={of:"is ok"};
-        x.of;
-        foo();  /* Label statement missing? No prob. */
-    }
-}
-
-fat_arrow_as_param: {
-    input: {
-        foo(x => x);
-        foo(x => x, y => y);
-
-        foo(x => (x, x));
-        foo(x => (x, x), y => (y, y));
-    }
-    expect_exact: "foo(x=>x);foo(x=>x,y=>y);foo(x=>(x,x));foo(x=>(x,x),y=>(y,y));"
-}
-
-default_assign: {
-    options = {
-        keep_fargs: false,
-        unused: true,
-    }
-    input: {
-        function f(a, b = 3) {
-            console.log(a);
-        }
-
-        g = ([[] = 123]) => {};
-        h = ([[x, y, z] = [4, 5, 6]] = []) => {};
-
-        function i([[x, y, z] = [4, 5, 6]] = []) {
-            console.log(b);
-        };
-    }
-    expect: {
-        function f(a) {
-            console.log(a);
-        }
-
-        g = ([[] = 123]) => {};
-        h = ([[x, y, z] = [4, 5, 6]] = []) => {};
-
-        function i([[x, y, z] = [4, 5, 6]] = []) {
-            console.log(b);
-        };
-    }
-}
-
-expansion: {
-    options = {
-        keep_fargs: false,
-        unused: true,
-    }
-    input: {
-        function f(a, ...b) {
-            console.log(a);
-        }
-    }
-    expect: {
-        function f(a) {
-            console.log(a);
-        }
-    }
-}
-
-issue_1613: {
-  mangle = { toplevel: true };
-  input: {
-    const name = 1;
-    const foo = {
-      name
-    };
-  }
-  expect_exact: "const n=1;const c={name:n};"
-}
-
-format_methods: {
-    beautify = {
-        beautify: true,
-    }
-    input: {
-        class A extends B {constructor(a){x()} static s(b,c){y()} run(d,e,f){z()}}
-    }
-    expect_exact: [
-        "class A extends B {",
-        "    constructor(a) {",
-        "        x();",
-        "    }",
-        "    static s(b, c) {",
-        "        y();",
-        "    }",
-        "    run(d, e, f) {",
-        "        z();",
-        "    }",
-        "}",
-    ]
-}
-
-issue_1898: {
-    options = {
-    }
-    mangle = {
-    }
-    input: {
-        class Foo {
-            bar() {
-                for (const x of [ 6, 5 ]) {
-                    for (let y of [ 4, 3 ]) {
-                        for (var z of [ 2, 1 ]) {
-                            console.log(x, y, z);
-                        }
-                    }
-                }
-            }
-        }
-        new Foo().bar();
-    }
-    expect: {
-        class Foo {
-            bar() {
-                for (const f of [ 6, 5 ])
-                    for (let r of [ 4, 3 ])
-                        for (var o of [ 2, 1 ])
-                            console.log(f, r, o);
-            }
-        }
-        new Foo().bar();
-    }
-}
-
-issue_1753: {
-    mangle = { safari10: true };
-    input: {
-        class SomeClass {
-            constructor(props) {
-                let pickedSets = [];
-                for (let i = 0; i < 6; i++) {
-                    pickedSets.push({
-                        mainDrawNumbers: [],
-                        extraDrawNumbers: []
-                    });
-                }
-            }
-        }
-    }
-    expect: {
-        class SomeClass {
-            constructor(r) {
-                let s = [];
-                for (let a = 0; a < 6; a++)
-                    s.push({
-                        mainDrawNumbers: [],
-                        extraDrawNumbers: []
-                    });
-            }
-        }
-    }
-}
-
-issue_1753_disable: {
-    mangle = { safari10: false }
-    input: {
-        class SomeClass {
-            constructor(props) {
-                let pickedSets = [];
-                for (let i = 0; i < 6; i++) {
-                    pickedSets.push({
-                        mainDrawNumbers: [],
-                        extraDrawNumbers: []
-                    });
-                }
-            }
-        }
-    }
-    expect: {
-        class SomeClass {
-            constructor(r) {
-                let s = [];
-                for (let r = 0; r < 6; r++)
-                    s.push({
-                        mainDrawNumbers: [],
-                        extraDrawNumbers: []
-                    });
-            }
-        }
-    }
-}
-
-class_extends: {
-    options = {
-        evaluate: true,
-    }
-    input: {
-        function f() {
-            class foo extends bar {}
-            class pro extends some.prop {}
-            class arr extends stuff[1 - 1] {}
-            class bin extends (a || b) {}
-            class seq extends (a, b) {}
-            class ter extends (a ? b : c) {}
-            class uni extends (!0) {}
-        }
-    }
-    expect_exact: "function f(){class foo extends bar{}class pro extends some.prop{}class arr extends stuff[0]{}class bin extends(a||b){}class seq extends(a,b){}class ter extends(a?b:c){}class uni extends(!0){}}"
-}
-
-class_extends_class: {
-    options = {
-    }
-    input: {
-        class anon extends class {} {}
-        class named extends class base {} {}
-    }
-    expect_exact: "class anon extends class{}{}class named extends class base{}{}"
-}
-
-class_extends_function: {
-    options = {
-    }
-    input: {
-        class anon extends function(){} {}
-        class named extends function base(){} {}
-    }
-    expect_exact: "class anon extends function(){}{}class named extends function base(){}{}"
-}
-
-class_extends_regex: {
-    options = {
-    }
-    input: {
-        function f() {
-            class rx1 extends (/rx/) {}
-            // class rx2 extends /rx/ {}  // FIXME - parse error
-        }
-    }
-    expect_exact: "function f(){class rx1 extends(/rx/){}}"
-}
-
-issue_2028: {
-    options = {
-        side_effects: true,
-    }
-    input: {
-        var a = {};
-        (function(x) {
-            x.X = function() {
-                return X;
-            };
-            class X {
-                static hello() {
-                    console.log("hello");
-                }
-            }
-        }(a));
-        a.X().hello();
-    }
-    expect: {
-        var a = {};
-        (function(x) {
-            x.X = function() {
-                return X;
-            };
-            class X {
-                static hello() {
-                    console.log("hello");
-                }
-            }
-        }(a));
-        a.X().hello();
-    }
-    expect_stdout: "hello"
-    node_version: ">=6"
-}
-
-class_expression_statement: {
-    options = {
-        toplevel: false,
-        side_effects: false,
-        unused: false,
-    }
-    input: {
-        (class {});
-        (class NamedClassExpr {});
-        let expr = (class AnotherClassExpr {});
-        class C {}
-    }
-    expect_exact: "(class{});(class NamedClassExpr{});let expr=class AnotherClassExpr{};class C{}"
-}
-
-class_expression_statement_unused: {
-    options = {
-        toplevel: false,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        (class {});
-        (class NamedClassExpr {});
-        let expr = (class AnotherClassExpr {});
-        class C {}
-    }
-    expect_exact: "let expr=class{};class C{}"
-}
-
-class_expression_statement_unused_toplevel: {
-    options = {
-        toplevel: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        (class {});
-        (class NamedClassExpr {});
-        let expr = (class AnotherClassExpr {});
-        class C {}
-    }
-    expect_exact: ""
-}
-
-export_default_function_decl: {
-    options = {
-        toplevel: true,
-        passes: 3,
-        unused: true,
-    }
-    input: {
-        // do not drop "unused" exports
-        export default function Foo() {};
-        export function Far() {};
-    }
-    expect_exact: "export default function Foo(){};export function Far(){};"
-}
-
-export_default_class_decl: {
-    options = {
-        toplevel: true,
-        passes: 3,
-        unused: true,
-    }
-    input: {
-        // do not drop "unused" exports
-        export default class Car {};
-        export class Cab {};
-    }
-    expect_exact: "export default class Car{};export class Cab{};"
-}
-
-object_rest_spread: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        var   { w: w1, ...V } = { w: 7, x: 1, y: 2 }; console.log(w1, V);
-        let   { w: w2, ...L } = { w: 8, x: 3, y: 4 }; console.log(w2, L);
-        const { w: w3, ...C } = { w: 9, x: 5, y: 6 }; console.log(w3, C);
-
-        let b;
-        ({ b, ...V } = { a: 1, b: 2, c: 3 }); console.log(V);
-        ({ b, ...L } = { a: 4, b: 5, c: 6 }); console.log(L);
-
-        (function({ y, ...p }){ console.log(p); })({ x: 1, y: 2, z: 3 });
-        (({ y, ...p }) =>     { console.log(p); })({ x: 4, y: 5, z: 6 });
-
-        const T = { a: 1, b: 2 }; console.log({ ...T, w: 0, ...{}, ...L, ...{K: 9} });
-    }
-    expect: {
-        var   { w: o, ...l } = { w: 7, x: 1, y: 2 }; console.log(o, l);
-        let   { w: c, ...n } = { w: 8, x: 3, y: 4 }; console.log(c, n);
-        const { w: e, ...s } = { w: 9, x: 5, y: 6 }; console.log(e, s);
-
-        let g;
-        ({ b: g, ...l } = { a: 1, b: 2, c: 3 }); console.log(l);
-        ({ b: g, ...n } = { a: 4, b: 5, c: 6 }); console.log(n);
-
-        (function({ y: o, ...l }) { console.log(l); })({ x: 1, y: 2, z: 3 });
-        (({ y: o, ...l }) =>      { console.log(l); })({ x: 4, y: 5, z: 6 });
-
-        const w = { a: 1, b: 2 }; console.log({ ...w, w: 0, ...{}, ...n, ...{ K: 9 } });
-    }
-}
-
-object_spread_unsafe: {
-    options = {
-        collapse_vars: true,
-        evaluate: true,
-        join_vars: true,
-        passes: 3,
-        reduce_vars: true,
-        side_effects: true,
-        toplevel: true,
-        unsafe: true,
-        unused: true,
-    }
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        var o1 = { x: 1, y: 2 };
-        var o2 = { x: 3, z: 4 };
-        var cloned = { ...o1 };
-        var merged = { ...o1, ...o2 };
-        console.log(cloned, merged);
-    }
-    expect: {
-        var o = { x: 1, y: 2 }, l = { ...o }, x = { ...o, ...{ x: 3, z: 4 } };
-        console.log(l, x);
-    }
-}
-
-array_spread_of_sequence: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        var a = [1];
-        console.log([...(a, a)]);
-        console.log([...a, a]);
-        console.log([...(a || a)]);
-        console.log([...a || a]);
-    }
-    expect: {
-        var o = [1];
-        console.log([...(o, o)]);
-        console.log([...o, o]);
-        console.log([...o || o]);
-        console.log([...o || o]);
-    }
-    expect_stdout: [
-        "[ 1 ]",
-        "[ 1, [ 1 ] ]",
-        "[ 1 ]",
-        "[ 1 ]",
-    ]
-    node_version: ">=6"
-}
-
-object_spread_of_sequence: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        var a = {x: 1};
-        console.log({ ...(a, a) });
-        console.log({ ...a, a });
-        console.log({ ...(a || a) });
-        console.log({ ...a || a });
-    }
-    expect: {
-        var o = { x: 1 };
-        console.log({ ...(o, o) });
-        console.log({ ...o, a: o });
-        console.log({ ...o || o });
-        console.log({ ...o || o });
-    }
-}

test/compress/hoist.js

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

test/compress/hoist_props.js

@@ -0,0 +1,688 @@
+issue_2377_1: {
+    options = {
+        evaluate: true,
+        inline: true,
+        hoist_props: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var obj = {
+            foo: 1,
+            bar: 2,
+            square: function(x) {
+                return x * x;
+            },
+            cube: function(x) {
+                return x * x * x;
+            },
+        };
+        console.log(obj.foo, obj.cube(3));
+    }
+    expect: {
+        var obj_foo = 1, obj_cube = function(x) {
+            return x * x * x;
+        };
+        console.log(obj_foo, obj_cube(3));
+    }
+    expect_stdout: "1 27"
+}
+
+issue_2377_2: {
+    options = {
+        evaluate: true,
+        inline: true,
+        hoist_props: true,
+        passes: 2,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var obj = {
+            foo: 1,
+            bar: 2,
+            square: function(x) {
+                return x * x;
+            },
+            cube: function(x) {
+                return x * x * x;
+            },
+        };
+        console.log(obj.foo, obj.cube(3));
+    }
+    expect: {
+        console.log(1, (x = 3, x * x * x));
+        var x;
+    }
+    expect_stdout: "1 27"
+}
+
+issue_2377_3: {
+    options = {
+        evaluate: true,
+        inline: true,
+        hoist_props: true,
+        passes: 4,
+        reduce_funcs: true,
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var obj = {
+            foo: 1,
+            bar: 2,
+            square: function(x) {
+                return x * x;
+            },
+            cube: function(x) {
+                return x * x * x;
+            },
+        };
+        console.log(obj.foo, obj.cube(3));
+    }
+    expect: {
+        console.log(1, 27);
+    }
+    expect_stdout: "1 27"
+}
+
+direct_access_1: {
+    options = {
+        hoist_props: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = 0;
+        var obj = {
+            a: 1,
+            b: 2,
+        };
+        for (var k in obj) a++;
+        console.log(a, obj.a);
+    }
+    expect: {
+        var a = 0;
+        var obj = {
+            a: 1,
+            b: 2,
+        };
+        for (var k in obj) a++;
+        console.log(a, obj.a);
+    }
+    expect_stdout: "2 1"
+}
+
+direct_access_2: {
+    options = {
+        hoist_props: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = { a: 1 };
+        var f = function(k) {
+            if (o[k]) return "PASS";
+        };
+        console.log(f("a"));
+    }
+    expect: {
+        var o = { a: 1 };
+        console.log(function(k) {
+            if (o[k]) return "PASS";
+        }("a"));
+    }
+    expect_stdout: "PASS"
+}
+
+direct_access_3: {
+    options = {
+        hoist_props: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = { a: 1 };
+        o.b;
+        console.log(o.a);
+    }
+    expect: {
+        var o = { a: 1 };
+        o.b;
+        console.log(o.a);
+    }
+    expect_stdout: "1"
+}
+
+single_use: {
+    options = {
+        hoist_props: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var obj = {
+            bar: function() {
+                return 42;
+            },
+        };
+        console.log(obj.bar());
+    }
+    expect: {
+        console.log({
+            bar: function() {
+                return 42;
+            },
+        }.bar());
+    }
+}
+
+name_collision_1: {
+    options = {
+        hoist_props: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+    }
+    input: {
+        var obj_foo = 1;
+        var obj_bar = 2;
+        function f() {
+            var obj = {
+                foo: 3,
+                bar: 4,
+                "b-r": 5,
+                "b+r": 6,
+                "b!r": 7,
+            };
+            console.log(obj_foo, obj.foo, obj.bar, obj["b-r"], obj["b+r"], obj["b!r"]);
+        }
+        f();
+    }
+    expect: {
+        var obj_foo = 1;
+        var obj_bar = 2;
+        function f() {
+            var obj_foo$0 = 3,
+                obj_bar = 4,
+                obj_b_r = 5,
+                obj_b_r$0 = 6,
+                obj_b_r$1 = 7;
+            console.log(obj_foo, obj_foo$0, obj_bar, obj_b_r, obj_b_r$0, obj_b_r$1);
+        }
+        f();
+    }
+    expect_stdout: "1 3 4 5 6 7"
+}
+
+name_collision_2: {
+    options = {
+        hoist_props: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+    }
+    input: {
+        var o = {
+            p: 1,
+            0: function(x) {
+                return x;
+            },
+            1: function(x) {
+                return x + 1;
+            }
+        }, o__$0 = 2, o__$1 = 3;
+        console.log(o.p === o.p, o[0](4), o[1](5), o__$0, o__$1);
+    }
+    expect: {
+        var o_p = 1,
+            o__ = function(x) {
+                return x;
+            },
+            o__$2 = function(x) {
+                return x + 1;
+            },
+            o__$0 = 2,
+            o__$1 = 3;
+        console.log(o_p === o_p, o__(4), o__$2(5), o__$0, o__$1);
+    }
+    expect_stdout: "true 4 6 2 3"
+}
+
+name_collision_3: {
+    options = {
+        hoist_props: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+    }
+    input: {
+        var o = {
+            p: 1,
+            0: function(x) {
+                return x;
+            },
+            1: function(x) {
+                return x + 1;
+            }
+        }, o__$0 = 2, o__$1 = 3;
+        console.log(o.p === o.p, o[0](4), o[1](5));
+    }
+    expect: {
+        var o_p = 1,
+            o__ = function(x) {
+                return x;
+            },
+            o__$2 = function(x) {
+                return x + 1;
+            },
+            o__$0 = 2,
+            o__$1 = 3;
+        console.log(o_p === o_p, o__(4), o__$2(5));
+    }
+    expect_stdout: "true 4 6"
+}
+
+contains_this_1: {
+    options = {
+        evaluate: true,
+        hoist_props: true,
+        inline: true,
+        passes: 2,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = {
+            u: function() {
+                return this === this;
+            },
+            p: 1
+        };
+        console.log(o.p, o.p);
+    }
+    expect: {
+        console.log(1, 1);
+    }
+    expect_stdout: "1 1"
+}
+
+contains_this_2: {
+    options = {
+        evaluate: true,
+        hoist_props: true,
+        inline: true,
+        passes: 2,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = {
+            u: function() {
+                return this === this;
+            },
+            p: 1
+        };
+        console.log(o.p, o.p, o.u);
+    }
+    expect: {
+        console.log(1, 1, function() {
+            return this === this;
+        });
+    }
+    expect_stdout: true
+}
+
+contains_this_3: {
+    options = {
+        evaluate: true,
+        hoist_props: true,
+        inline: true,
+        passes: 2,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = {
+            u: function() {
+                return this === this;
+            },
+            p: 1
+        };
+        console.log(o.p, o.p, o.u());
+    }
+    expect: {
+        var o = {
+            u: function() {
+                return this === this;
+            },
+            p: 1
+        };
+        console.log(o.p, o.p, o.u());
+    }
+    expect_stdout: "1 1 true"
+}
+
+new_this: {
+    options = {
+        evaluate: true,
+        hoist_props: true,
+        inline: true,
+        passes: 2,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = {
+            a: 1,
+            b: 2,
+            f: function(a) {
+                this.b = a;
+            }
+        };
+        console.log(new o.f(o.a).b, o.b);
+    }
+    expect: {
+        console.log(new function(a) {
+            this.b = a;
+        }(1).b, 2);
+    }
+    expect_stdout: "1 2"
+}
+
+issue_2473_1: {
+    options = {
+        hoist_props: false,
+        reduce_vars: true,
+        top_retain: [ "x", "y" ],
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var x = {};
+        var y = [];
+        var z = {};
+    }
+    expect: {
+        var x = {};
+        var y = [];
+    }
+}
+
+issue_2473_2: {
+    options = {
+        hoist_props: true,
+        reduce_vars: true,
+        top_retain: [ "x", "y" ],
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var x = {};
+        var y = [];
+        var z = {};
+    }
+    expect: {
+        var x = {};
+        var y = [];
+    }
+}
+
+issue_2473_3: {
+    options = {
+        hoist_props: true,
+        reduce_vars: true,
+        top_retain: "o",
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = {
+            a: 1,
+            b: 2,
+        };
+        console.log(o.a, o.b);
+    }
+    expect: {
+        var o = {
+            a: 1,
+            b: 2,
+        };
+        console.log(o.a, o.b);
+    }
+    expect_stdout: "1 2"
+}
+
+issue_2473_4: {
+    options = {
+        hoist_props: true,
+        reduce_vars: true,
+        top_retain: "o",
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        (function() {
+            var o = {
+                a: 1,
+                b: 2,
+            };
+            console.log(o.a, o.b);
+        })();
+    }
+    expect: {
+        (function() {
+            var o_a = 1, o_b = 2;
+            console.log(o_a, o_b);
+        })();
+    }
+    expect_stdout: "1 2"
+}
+
+issue_2508_1: {
+    options = {
+        collapse_vars: true,
+        hoist_props: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = {
+            a: [ 1 ],
+            f: function(x) {
+                console.log(x);
+            }
+        };
+        o.f(o.a);
+    }
+    expect: {
+        (function(x) {
+            console.log(x);
+        })([ 1 ]);
+    }
+    expect_stdout: true
+}
+
+issue_2508_2: {
+    options = {
+        collapse_vars: true,
+        hoist_props: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = {
+            a: { b: 2 },
+            f: function(x) {
+                console.log(x);
+            }
+        };
+        o.f(o.a);
+    }
+    expect: {
+        (function(x) {
+            console.log(x);
+        })({ b: 2 });
+    }
+    expect_stdout: true
+}
+
+issue_2508_3: {
+    options = {
+        collapse_vars: true,
+        hoist_props: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = {
+            a: [ o ],
+            f: function(x) {
+                console.log(x);
+            }
+        };
+        o.f(o.a);
+    }
+    expect: {
+        var o = {
+            a: [ o ],
+            f: function(x) {
+                console.log(x);
+            }
+        };
+        o.f(o.a);
+    }
+    expect_stdout: true
+}
+
+issue_2508_4: {
+    options = {
+        collapse_vars: true,
+        hoist_props: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = {
+            a: { b: o },
+            f: function(x) {
+                console.log(x);
+            }
+        };
+        o.f(o.a);
+    }
+    expect: {
+        var o = {
+            a: { b: o },
+            f: function(x) {
+                console.log(x);
+            }
+        };
+        o.f(o.a);
+    }
+    expect_stdout: true
+}
+
+issue_2508_5: {
+    options = {
+        collapse_vars: true,
+        hoist_props: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = {
+            f: function(x) {
+                console.log(x);
+            }
+        };
+        o.f(o.f);
+    }
+    expect: {
+        var o_f = function(x) {
+            console.log(x);
+        };
+        o_f(o_f);
+    }
+    expect_stdout: true
+}
+
+issue_2519: {
+    options = {
+        collapse_vars: true,
+        evaluate: true,
+        hoist_props: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        function testFunc() {
+            var dimensions = {
+                minX: 5,
+                maxX: 6,
+            };
+            var scale = 1;
+            var d = {
+                x: (dimensions.maxX + dimensions.minX) / 2,
+            };
+            return d.x * scale;
+        }
+        console.log(testFunc());
+    }
+    expect: {
+        function testFunc() {
+            return 1 * ((6 + 5) / 2);
+        }
+        console.log(testFunc());
+    }
+    expect_stdout: "5.5"
+}
+
+undefined_key: {
+    options = {
+        evaluate: true,
+        hoist_props: true,
+        join_vars: true,
+        passes: 4,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a, o = {};
+        o[a] = 1;
+        o.b = 2;
+        console.log(o[a] + o.b);
+    }
+    expect: {
+        console.log(3);
+    }
+    expect_stdout: "3"
+}

test/compress/html_comments.js

@@ -53,12 +53,3 @@ html_comment_in_string_literal: {
     }
     expect_exact: 'function f(){return"\\x3c!--HTML--\\x3ecomment in\\x3c!--string literal--\\x3e"}';
 }
-
-html_comment_after_multiline_comment: {
-    input: {
-        var foo; /*
-*/-->   var bar;
-        var foobar;
-    }
-    expect_exact: "var foo;var foobar;"
-}

test/compress/if_return.js

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

test/compress/issue-1001.js

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

test/compress/issue-1034.js

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

test/compress/issue-1041.js

@@ -1,19 +1,7 @@
-const_declaration: {
-    options = {
-        evaluate: true
-    };
-
-    input: {
-        const goog = goog || {};
-    }
-    expect: {
-        const goog = goog || {};
-    }
-}
-
 const_pragma: {
     options = {
         evaluate: true,
+        reduce_funcs: true,
         reduce_vars: true,
     };
 
@@ -29,6 +17,7 @@ const_pragma: {
 not_const: {
     options = {
         evaluate: true,
+        reduce_funcs: true,
         reduce_vars: true,
     };
 

test/compress/issue-1043.js

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

test/compress/issue-1044.js

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

test/compress/issue-1052.js

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

test/compress/issue-1105.js

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

test/compress/issue-1212.js

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

test/compress/issue-1261.js

@@ -8,7 +8,6 @@ pure_function_calls: {
         unused       : true,
         if_return    : true,
         join_vars    : true,
-        cascade      : true,
         negate_iife  : true,
     }
     input: {
@@ -49,13 +48,13 @@ pure_function_calls: {
         a.b(), f.g();
     }
     expect_warnings: [
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:17,8]",
-        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:17,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:30,37]",
-        "WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:30,16]",
-        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:28,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:38,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:39,31]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:16,8]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:16,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:29,37]",
+        "WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:29,16]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:27,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:37,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:38,31]",
     ]
 }
 
@@ -69,7 +68,6 @@ pure_function_calls_toplevel: {
         unused       : true,
         if_return    : true,
         join_vars    : true,
-        cascade      : true,
         negate_iife  : true,
         toplevel     : true,
     }
@@ -112,17 +110,17 @@ pure_function_calls_toplevel: {
         a.b(), f.g();
     }
     expect_warnings: [
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:79,8]",
-        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:79,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:92,37]",
-        "WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:92,16]",
-        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:90,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:107,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:108,31]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:84,33]",
-        "WARN: Dropping unused variable iife1 [test/compress/issue-1261.js:84,12]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:100,45]",
-        "WARN: Dropping unused variable MyClass [test/compress/issue-1261.js:100,12]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:77,8]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:77,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:90,37]",
+        "WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:90,16]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:88,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:105,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:106,31]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:82,33]",
+        "WARN: Dropping unused variable iife1 [test/compress/issue-1261.js:82,12]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:98,45]",
+        "WARN: Dropping unused variable MyClass [test/compress/issue-1261.js:98,12]",
     ]
 }
 
@@ -157,29 +155,29 @@ should_warn: {
         baz();
     }
     expect_warnings: [
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:137,61]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:137,23]",
-        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:137,23]",
-        "WARN: Boolean || always true [test/compress/issue-1261.js:138,23]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:135,61]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:135,23]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:135,23]",
+        "WARN: Boolean || always true [test/compress/issue-1261.js:136,23]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:136,23]",
+        "WARN: Condition always true [test/compress/issue-1261.js:136,23]",
+        "WARN: Condition left of || always true [test/compress/issue-1261.js:137,8]",
+        "WARN: Condition always true [test/compress/issue-1261.js:137,8]",
+        "WARN: Boolean && always false [test/compress/issue-1261.js:138,23]",
         "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:138,23]",
-        "WARN: Condition always true [test/compress/issue-1261.js:138,23]",
-        "WARN: Condition left of || always true [test/compress/issue-1261.js:139,8]",
-        "WARN: Condition always true [test/compress/issue-1261.js:139,8]",
-        "WARN: Boolean && always false [test/compress/issue-1261.js:140,23]",
+        "WARN: Condition always false [test/compress/issue-1261.js:138,23]",
+        "WARN: Condition left of && always false [test/compress/issue-1261.js:139,8]",
+        "WARN: Condition always false [test/compress/issue-1261.js:139,8]",
+        "WARN: + in boolean context always true [test/compress/issue-1261.js:140,23]",
         "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:140,23]",
-        "WARN: Condition always false [test/compress/issue-1261.js:140,23]",
-        "WARN: Condition left of && always false [test/compress/issue-1261.js:141,8]",
-        "WARN: Condition always false [test/compress/issue-1261.js:141,8]",
-        "WARN: + in boolean context always true [test/compress/issue-1261.js:142,23]",
+        "WARN: Condition always true [test/compress/issue-1261.js:140,23]",
+        "WARN: + in boolean context always true [test/compress/issue-1261.js:141,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:141,31]",
+        "WARN: Condition always true [test/compress/issue-1261.js:141,8]",
         "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:142,23]",
-        "WARN: Condition always true [test/compress/issue-1261.js:142,23]",
-        "WARN: + in boolean context always true [test/compress/issue-1261.js:143,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:143,31]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:143,24]",
         "WARN: Condition always true [test/compress/issue-1261.js:143,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:144,23]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:145,24]",
-        "WARN: Condition always true [test/compress/issue-1261.js:145,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:146,31]",
-        "WARN: Condition always false [test/compress/issue-1261.js:146,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:144,31]",
+        "WARN: Condition always false [test/compress/issue-1261.js:144,8]",
     ]
 }

test/compress/issue-1275.js

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

test/compress/issue-1443.js

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

test/compress/issue-1447.js

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

test/compress/issue-1466.js

@@ -1,291 +0,0 @@
-same_variable_in_multiple_for_loop: {
-    options = {
-        hoist_funs: true,
-        dead_code: true,
-        conditionals: true,
-        comparisons: true,
-        evaluate: true,
-        booleans: true,
-        loops: true,
-        unused: true,
-        keep_fargs: true,
-        if_return: true,
-        join_vars: true,
-        cascade: true,
-        side_effects: true,
-        collapse_vars: true,
-    }
-    mangle = {}
-    input: {
-        for (let i = 0; i < 3; i++) {
-            let a = 100;
-            console.log(i, a);
-            for (let i = 0; i < 2; i++) {
-                console.log(i, a);
-                let c = 2;
-                console.log(c);
-            }
-        }
-    }
-    expect: {
-        for (let o = 0; o < 3; o++) {
-            let l = 100;
-            console.log(o, l);
-            for (let o = 0; o < 2; o++) {
-                console.log(o, l);
-                let e = 2;
-                console.log(e);
-            }
-        }
-    }
-    expect_stdout: true
-}
-
-same_variable_in_multiple_forOf: {
-    options = {
-        hoist_funs: true,
-        dead_code: true,
-        conditionals: true,
-        comparisons: true,
-        evaluate: true,
-        booleans: true,
-        loops: true,
-        unused: true,
-        keep_fargs: true,
-        if_return: true,
-        join_vars: true,
-        cascade: true,
-        side_effects: true,
-        collapse_vars: true,
-    }
-    mangle = {}
-    input: {
-        var test = [ "a", "b", "c" ];
-        for (let tmp of test) {
-            console.log(tmp);
-            let dd;
-            dd = [ "e", "f", "g" ];
-            for (let tmp of dd) {
-                console.log(tmp);
-            }
-        }
-    }
-    expect: {
-        var test = [ "a", "b", "c" ];
-        for (let o of test) {
-            console.log(o);
-            let e;
-            e = [ "e", "f", "g" ];
-            for (let o of e)
-                console.log(o);
-        }
-    }
-    expect_stdout: true
-}
-
-same_variable_in_multiple_forIn: {
-    options = {
-        hoist_funs: true,
-        dead_code: true,
-        conditionals: true,
-        comparisons: true,
-        evaluate: true,
-        booleans: true,
-        loops: true,
-        unused: false,
-        keep_fargs: true,
-        if_return: true,
-        join_vars: true,
-        cascade: true,
-        side_effects: true,
-        collapse_vars: true,
-    }
-    mangle = {}
-    input: {
-        var test = [ "a", "b", "c" ];
-        for (let tmp in test) {
-            console.log(tmp);
-            let dd;
-            dd = [ "e", "f", "g" ];
-            for (let tmp in test) {
-                console.log(tmp);
-            }
-        }
-    }
-    expect: {
-        var test = [ "a", "b", "c" ];
-        for (let e in test) {
-            console.log(e);
-            let t;
-            t = [ "e", "f", "g" ];
-            for (let e in test)
-                console.log(e);
-        }
-    }
-    expect_stdout: true
-}
-
-different_variable_in_multiple_for_loop: {
-    options = {
-        hoist_funs: true,
-        dead_code: true,
-        conditionals: true,
-        comparisons: true,
-        evaluate: true,
-        booleans: true,
-        loops: true,
-        unused: true,
-        keep_fargs: true,
-        if_return: true,
-        join_vars: true,
-        cascade: true,
-        side_effects: true,
-        collapse_vars: true,
-    }
-    mangle = {}
-    input: {
-        for (let i = 0; i < 3; i++) {
-            let a = 100;
-            console.log(i, a);
-            for (let j = 0; j < 2; j++) {
-                console.log(j, a);
-                let c = 2;
-                console.log(c);
-            }
-        }
-    }
-    expect: {
-        for (let o = 0; o < 3; o++) {
-            let l = 100;
-            console.log(o, l);
-            for (let o = 0; o < 2; o++) {
-                console.log(o, l);
-                let e = 2;
-                console.log(e);
-            }
-        }
-    }
-    expect_stdout: true
-}
-
-different_variable_in_multiple_forOf: {
-    options = {
-        hoist_funs: true,
-        dead_code: true,
-        conditionals: true,
-        comparisons: true,
-        evaluate: true,
-        booleans: true,
-        loops: true,
-        unused: true,
-        keep_fargs: true,
-        if_return: true,
-        join_vars: true,
-        cascade: true,
-        side_effects: true,
-        collapse_vars: true,
-    }
-    mangle = {}
-    input: {
-        var test = [ "a", "b", "c" ];
-        for (let tmp of test) {
-            console.log(tmp);
-            let dd;
-            dd = [ "e", "f", "g" ];
-            for (let t of dd) {
-                console.log(t);
-            }
-        }
-    }
-    expect: {
-        var test = [ "a", "b", "c" ];
-        for (let o of test) {
-            console.log(o);
-            let e;
-            e = [ "e", "f", "g" ];
-            for (let o of e)
-                console.log(o);
-        }
-    }
-    expect_stdout: true
-}
-
-different_variable_in_multiple_forIn: {
-    options = {
-        hoist_funs: true,
-        dead_code: true,
-        conditionals: true,
-        comparisons: true,
-        evaluate: true,
-        booleans: true,
-        loops: true,
-        unused: false,
-        keep_fargs: true,
-        if_return: true,
-        join_vars: true,
-        cascade: true,
-        side_effects: true,
-        collapse_vars: true,
-    }
-    mangle = {}
-    input: {
-        var test = [ "a", "b", "c" ];
-        for (let tmp in test) {
-            console.log(tmp);
-            let dd;
-            dd = [ "e", "f", "g" ];
-            for (let t in test) {
-                console.log(t);
-            }
-        }
-    }
-    expect: {
-        var test = [ "a", "b", "c" ];
-        for (let e in test) {
-            console.log(e);
-            let t;
-            t = [ "e", "f", "g" ];
-            for (let e in test)
-                console.log(e);
-        }
-    }
-    expect_stdout: true
-}
-
-more_variable_in_multiple_for: {
-    options = {
-        hoist_funs: true,
-        dead_code: true,
-        conditionals: true,
-        comparisons: true,
-        evaluate: true,
-        booleans: true,
-        loops: true,
-        unused: false,
-        keep_fargs: true,
-        if_return: true,
-        join_vars: true,
-        cascade: true,
-        side_effects: true,
-        collapse_vars: true,
-    }
-    mangle = {}
-    input: {
-        for (let a = 9, i = 0; i < 20; i += a) {
-            let b = a++ + i;
-            console.log(a, b, i);
-            for (let k = b, m = b*b, i = 0; i < 10; i++) {
-                console.log(a, b, m, k, i);
-            }
-        }
-    }
-    expect: {
-        for (let o = 9, l = 0; l < 20; l += o) {
-            let e = o++ + l;
-            console.log(o, e, l);
-            for (let l = e, t = e * e, c = 0; c < 10; c++)
-                console.log(o, e, t, l, c);
-        }
-    }
-    expect_stdout: true
-}

test/compress/issue-1588.js

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

test/compress/issue-1609.js

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

test/compress/issue-1639.js

@@ -2,7 +2,7 @@
 issue_1639_1: {
     options = {
         booleans: true,
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         evaluate: true,
         join_vars: true,
@@ -26,7 +26,7 @@ issue_1639_1: {
     }
     expect: {
         for (var a = 100, b = 10, L1 = 5; --L1 > 0;)
-            if (--b, !1) var ignore = 0;
+            if (--b, 0) var ignore = 0;
         console.log(a, b);
     }
     expect_stdout: true
@@ -35,7 +35,7 @@ issue_1639_1: {
 issue_1639_2: {
     options = {
         booleans: true,
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         evaluate: true,
         join_vars: true,
@@ -57,7 +57,7 @@ issue_1639_2: {
     expect: {
         var a = 100, b = 10;
         function f19() {
-            ++a, 1;
+            ++a, 0;
         }
         f19(),
         console.log(a, b);
@@ -68,7 +68,7 @@ issue_1639_2: {
 issue_1639_3: {
     options = {
         booleans: true,
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         evaluate: true,
         sequences: true,

test/compress/issue-1656.js

@@ -1,7 +1,6 @@
 f7: {
     options = {
         booleans: true,
-        cascade: true,
         collapse_vars: true,
         comparisons: true,
         conditionals: true,
@@ -15,6 +14,7 @@ f7: {
         negate_iife: true,
         passes: 3,
         properties: true,
+        reduce_funcs: true,
         reduce_vars: true,
         sequences: true,
         side_effects: true,
@@ -38,7 +38,7 @@ f7: {
         "var b = 10;",
         "",
         "!function() {",
-        "    for (;b = 100, !1; ) ;",
+        "    b = 100;",
         "}(), console.log(100, b);",
     ]
     expect_stdout: true

test/compress/issue-1673.js

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

test/compress/issue-1750.js

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

test/compress/issue-1770.js

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

test/compress/issue-1787.js

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

test/compress/issue-1833.js

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

test/compress/issue-2001.js

@@ -1,281 +0,0 @@
-export_func_1: {
-    options = {
-        hoist_funs: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        export function f(){};
-    }
-    expect_exact: "export function f(){};"
-}
-
-export_func_2: {
-    options = {
-        hoist_funs: true,
-        side_effects: false,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        export function f(){}(1);
-    }
-    expect_exact: "export function f(){};1;"
-}
-
-export_func_3: {
-    options = {
-        hoist_funs: true,
-        side_effects: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        export function f(){}(1);
-    }
-    expect_exact: "export function f(){};"
-}
-
-export_default_func_1: {
-    options = {
-        hoist_funs: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        export default function f(){};
-    }
-    expect_exact: "export default function f(){};"
-}
-
-export_default_func_2: {
-    options = {
-        hoist_funs: true,
-        side_effects: false,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        export default function f(){}(1);
-    }
-    expect_exact: "export default function f(){};1;"
-}
-
-export_default_func_3: {
-    options = {
-        hoist_funs: true,
-        side_effects: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        export default function f(){}(1);
-    }
-    expect_exact: "export default function f(){};"
-}
-
-export_class_1: {
-    options = {
-        hoist_funs: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        export class C {};
-    }
-    expect_exact: "export class C{};"
-}
-
-export_class_2: {
-    options = {
-        hoist_funs: true,
-        side_effects: false,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        export class C {}(1);
-    }
-    expect_exact: "export class C{};1;"
-}
-
-export_class_3: {
-    options = {
-        hoist_funs: true,
-        side_effects: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        export class C {}(1);
-    }
-    expect_exact: "export class C{};"
-}
-
-export_default_class_1: {
-    options = {
-        hoist_funs: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        export default class C {};
-    }
-    expect_exact: "export default class C{};"
-}
-
-export_default_class_2: {
-    options = {
-        hoist_funs: true,
-        side_effects: false,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        export default class C {}(1);
-    }
-    expect_exact: "export default class C{};1;"
-}
-
-export_default_class_3: {
-    options = {
-        hoist_funs: true,
-        side_effects: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        export default class C {}(1);
-    }
-    expect_exact: "export default class C{};"
-}
-
-export_mangle_1: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        export function foo(one, two) {
-            return one - two;
-        };
-    }
-    expect_exact: "export function foo(o,n){return o-n};"
-}
-
-export_mangle_2: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        export default function foo(one, two) {
-            return one - two;
-        };
-    }
-    expect_exact: "export default function foo(o,t){return o-t};"
-}
-
-export_mangle_3: {
-    options = {
-        collapse_vars: true,
-    }
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        export class C {
-            go(one, two) {
-                var z = one;
-                return one - two + z;
-            }
-        };
-    }
-    expect_exact: "export class C{go(r,e){return r-e+r}};"
-}
-
-export_mangle_4: {
-    options = {
-        collapse_vars: true,
-    }
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        export default class C {
-            go(one, two) {
-                var z = one;
-                return one - two + z;
-            }
-        };
-    }
-    expect_exact: "export default class C{go(e,r){return e-r+e}};"
-}
-
-export_mangle_5: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        export default {
-            prop: function(one, two) {
-                return one - two;
-            }
-        };
-    }
-    expect_exact: "export default{prop:function(r,t){return r-t}};"
-}
-
-export_mangle_6: {
-    mangle = {
-        toplevel: true,
-    }
-    input: {
-        var baz = 2;
-        export let foo = 1, bar = baz;
-    }
-    expect_exact: "var o=2;export let foo=1,bar=o;"
-}
-
-export_toplevel_1: {
-    options = {
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        function f(){}
-        export function g(){};
-        export default function h(){};
-    }
-    expect: {
-        export function g(){};
-        export default function h(){};
-    }
-}
-
-export_toplevel_2: {
-    options = {
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        class A {}
-        export class B {};
-        export default class C {};
-    }
-    expect: {
-        export class B {};
-        export default class C {};
-    }
-}
-
-export_default_func_ref: {
-    options = {
-        hoist_funs: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        export default function f(){};
-        f();
-    }
-    expect_exact: "export default function f(){};f();"
-}

test/compress/issue-203.js

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

test/compress/issue-208.js

@@ -38,7 +38,7 @@ mixed: {
         }
     }
     input: {
-        const ENV = 3;
+        var ENV = 3;
         var FOO = 4;
         f(ENV * 10);
         --FOO;
@@ -49,7 +49,7 @@ mixed: {
         x = DEBUG;
     }
     expect: {
-        const ENV = 3;
+        var ENV = 3;
         var FOO = 4;
         f(10);
         --FOO;
@@ -60,7 +60,7 @@ mixed: {
         x = 0;
     }
     expect_warnings: [
-        'WARN: global_defs ENV redefined [test/compress/issue-208.js:41,14]',
+        'WARN: global_defs ENV redefined [test/compress/issue-208.js:41,12]',
         'WARN: global_defs FOO redefined [test/compress/issue-208.js:42,12]',
         'WARN: global_defs FOO redefined [test/compress/issue-208.js:44,10]',
         'WARN: global_defs DEBUG redefined [test/compress/issue-208.js:45,8]',

test/compress/issue-2652.js

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

test/compress/issue-269.js

@@ -64,3 +64,27 @@ strings_concat: {
 		);
 	}
 }
+
+regexp: {
+	options = {
+		evaluate: true,
+		unsafe: true,
+	}
+	input: {
+		RegExp("foo");
+		RegExp("bar", "ig");
+		RegExp(foo);
+		RegExp("bar", ig);
+		RegExp("should", "fail");
+	}
+	expect: {
+		/foo/;
+		/bar/ig;
+		RegExp(foo);
+		RegExp("bar", ig);
+		RegExp("should", "fail");
+	}
+	expect_warnings: [
+		'WARN: Error converting RegExp("should","fail") [test/compress/issue-269.js:78,2]',
+	]
+}

test/compress/issue-2719.js

@@ -0,0 +1,32 @@
+warn: {
+    options = {
+        evaluate: true,
+        inline: true,
+        passes: 2,
+        properties: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        function f() {
+            return g();
+        }
+        function g() {
+            return g["call" + "er"].arguments;
+        }
+        // 3
+        console.log(f(1, 2, 3).length);
+    }
+    expect: {
+        // TypeError: Cannot read property 'arguments' of null
+        console.log(function g() {
+            return g.caller.arguments;
+        }().length);
+    }
+    expect_warnings: [
+        "WARN: Function.protoype.caller not supported [test/compress/issue-2719.js:17,19]",
+        "WARN: Function.protoype.arguments not supported [test/compress/issue-2719.js:17,19]",
+    ]
+}

test/compress/issue-281.js

@@ -3,6 +3,7 @@ collapse_vars_constants: {
         collapse_vars: true,
         evaluate: true,
         inline: true,
+        reduce_funcs: true,
         reduce_vars: true,
         unused: true,
     }
@@ -240,6 +241,7 @@ negate_iife_issue_1073: {
         evaluate: true,
         inline: true,
         negate_iife: true,
+        reduce_funcs: true,
         reduce_vars: true,
         sequences: true,
         unused: true,
@@ -267,6 +269,7 @@ issue_1288_side_effects: {
         evaluate: true,
         inline: true,
         negate_iife: true,
+        reduce_funcs: true,
         reduce_vars: true,
         side_effects: true,
         unused: true,
@@ -299,6 +302,7 @@ inner_var_for_in_1: {
     options = {
         evaluate: true,
         inline: true,
+        reduce_funcs: true,
         reduce_vars: true,
     }
     input: {
@@ -330,6 +334,7 @@ issue_1595_3: {
         evaluate: true,
         inline: true,
         passes: 2,
+        reduce_funcs: true,
         reduce_vars: true,
         unused: true,
     }
@@ -448,7 +453,7 @@ pure_annotation_2: {
 
 drop_fargs: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         inline: true,
         keep_fargs: false,
         side_effects: true,
@@ -471,7 +476,7 @@ drop_fargs: {
 
 keep_fargs: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         inline: true,
         keep_fargs: true,
         side_effects: true,

test/compress/issue-2871.js

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

test/compress/issue-368.js

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

test/compress/issue-637.js

@@ -17,6 +17,6 @@ wrongly_optimized: {
             foo();
         }
         // TODO: optimize to `func(), bar()`
-        (func(), 0) || bar();
+        (func(), 1) && bar();
     }
 }

test/compress/issue-640.js

@@ -100,7 +100,7 @@ wrongly_optimized: {
             foo();
         }
         // TODO: optimize to `func(), bar()`
-        if (func(), !0) bar();
+        if (func(), 1) bar();
     }
 }
 

test/compress/issue-892.js

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

test/compress/issue-926.js

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

test/compress/issue-973.js

@@ -1,7 +1,8 @@
 this_binding_conditionals: {
     options = {
         conditionals: true,
-        evaluate    : true
+        evaluate: true,
+        side_effects: true,
     };
     input: {
         (1 && a)();
@@ -51,6 +52,7 @@ this_binding_collapse_vars: {
     options = {
         collapse_vars: true,
         toplevel: true,
+        unused: true,
     };
     input: {
         var c = a; c();

test/compress/issue-976.js

@@ -2,7 +2,7 @@ eval_collapse_vars: {
     options = {
         collapse_vars:true, sequences:false, properties:true, dead_code:true, conditionals:true,
         comparisons:true, evaluate:true, booleans:true, loops:true, unused:true, hoist_funs:true,
-        keep_fargs:true, if_return:true, join_vars:true, cascade:true, side_effects:true
+        keep_fargs:true, if_return:true, join_vars:true, side_effects:true
     };
     input: {
         function f1() {

test/compress/issue-979.js

@@ -2,7 +2,7 @@ issue979_reported: {
     options = {
         sequences:true, properties:true, dead_code:true, conditionals:true,
         comparisons:true, evaluate:true, booleans:true, loops:true, unused:true, hoist_funs:true,
-        keep_fargs:true, if_return:true, join_vars:true, cascade:true, side_effects:true
+        keep_fargs:true, if_return:true, join_vars:true, side_effects:true
     }
     input: {
         function f1() {
@@ -32,7 +32,7 @@ issue979_test_negated_is_best: {
     options = {
         sequences:true, properties:true, dead_code:true, conditionals:true,
         comparisons:true, evaluate:true, booleans:true, loops:true, unused:true, hoist_funs:true,
-        keep_fargs:true, if_return:true, join_vars:true, cascade:true, side_effects:true
+        keep_fargs:true, if_return:true, join_vars:true, side_effects:true
     }
     input: {
         function f3() {

test/compress/join-vars.js

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

test/compress/loops.js

@@ -146,55 +146,13 @@ parse_do_while_without_semicolon: {
     }
 }
 
-
-keep_collapse_const_in_own_block_scope: {
-    options = {
-        join_vars: true,
-        loops: true
-    }
-    input: {
-        var i=2;
-        const c=5;
-        while(i--)
-            console.log(i);
-        console.log(c);
-    }
-    expect: {
-        var i=2;
-        const c=5;
-        for(;i--;)
-            console.log(i);
-        console.log(c);
-    }
-    expect_stdout: true
-}
-
-keep_collapse_const_in_own_block_scope_2: {
-    options = {
-        join_vars: true,
-        loops: true
-    }
-    input: {
-        const c=5;
-        var i=2; // Moves to loop, while it did not in previous test
-        while(i--)
-            console.log(i);
-        console.log(c);
-    }
-    expect: {
-        const c=5;
-        for(var i=2;i--;)
-            console.log(i);
-        console.log(c);
-    }
-    expect_stdout: true
-}
-
 evaluate: {
     options = {
-        loops: true,
         dead_code: true,
         evaluate: true,
+        loops: true,
+        passes: 2,
+        side_effects: true,
     };
     input: {
         while (true) {
@@ -494,3 +452,173 @@ in_parenthesis_2: {
     }
     expect_exact: 'for(function(){"foo"in{}};0;);'
 }
+
+init_side_effects: {
+    options = {
+        loops: true,
+        side_effects: true,
+    };
+    input: {
+        for (function() {}(), i = 0; i < 5; i++) console.log(i);
+        for (function() {}(); i < 10; i++) console.log(i);
+    }
+    expect: {
+        for (i = 0; i < 5; i++) console.log(i);
+        for (; i < 10; i++) console.log(i);
+    }
+    expect_stdout: true
+}
+
+dead_code_condition: {
+    options = {
+        dead_code: true,
+        evaluate: true,
+        loops: true,
+        sequences: true,
+    }
+    input: {
+        for (var a = 0, b = 5; (a += 1, 3) - 3 && b > 0; b--) {
+            var c = function() {
+                b--;
+            }(a++);
+        }
+        console.log(a);
+    }
+    expect: {
+        var c;
+        var a = 0, b = 5;
+        a += 1, 0,
+        console.log(a);
+    }
+    expect_stdout: "1"
+}
+
+issue_2740_1: {
+    options = {
+        dead_code: true,
+        loops: true,
+    }
+    input: {
+        for (; ; ) break;
+        for (a(); ; ) break;
+        for (; b(); ) break;
+        for (c(); d(); ) break;
+        for (; ; e()) break;
+        for (f(); ; g()) break;
+        for (; h(); i()) break;
+        for (j(); k(); l()) break;
+    }
+    expect: {
+        a();
+        b();
+        c();
+        d();
+        f();
+        h();
+        j();
+        k();
+    }
+}
+
+issue_2740_2: {
+    options = {
+        dead_code: true,
+        loops: true,
+        passes: 2,
+    }
+    input: {
+        L1: while (x()) {
+            break L1;
+        }
+    }
+    expect: {
+        x();
+    }
+}
+
+issue_2740_3: {
+    options = {
+        dead_code: true,
+        loops: true,
+    }
+    input: {
+        L1: for (var x = 0; x < 3; x++) {
+            L2: for (var y = 0; y < 2; y++) {
+                break L1;
+            }
+        }
+        console.log(x, y);
+    }
+    expect: {
+        L1: for (var x = 0; x < 3; x++)
+            for (var y = 0; y < 2; y++)
+                break L1;
+        console.log(x, y);
+    }
+    expect_stdout: "0 0"
+}
+
+issue_2740_4: {
+    options = {
+        dead_code: true,
+        loops: true,
+        passes: 2,
+    }
+    input: {
+        L1: for (var x = 0; x < 3; x++) {
+            L2: for (var y = 0; y < 2; y++) {
+                break L2;
+            }
+        }
+        console.log(x, y);
+    }
+    expect: {
+        for (var x = 0; x < 3; x++) {
+            var y = 0;
+            y < 2;
+        }
+        console.log(x, y);
+    }
+    expect_stdout: "3 0"
+}
+
+issue_2740_5: {
+    options = {
+        dead_code: true,
+        loops: true,
+        passes: 2,
+    }
+    input: {
+        L1: for (var x = 0; x < 3; x++) {
+            break L1;
+            L2: for (var y = 0; y < 2; y++) {
+                break L2;
+            }
+        }
+        console.log(x, y);
+    }
+    expect: {
+        var x = 0;
+        x < 3;
+        var y;
+        console.log(x,y);
+    }
+    expect_stdout: "0 undefined"
+}
+
+issue_2904: {
+    options = {
+        join_vars: true,
+        loops: true,
+    }
+    input: {
+        var a = 1;
+        do {
+            console.log(a);
+        } while (--a);
+    }
+    expect: {
+        for (var a = 1; console.log(a), --a;);
+    }
+    expect_stdout: "1"
+}

test/compress/new.js

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

test/compress/object.js

@@ -1,746 +0,0 @@
-getter_setter: {
-    input: {
-        var get = "bar";
-        var a = {
-            get,
-            set: "foo",
-            get bar() {
-                return this.get;
-            },
-            get 5() {
-                return "five";
-            },
-            get 0xf55() {
-                return "f five five";
-            },
-            get "five"() {
-                return 5;
-            },
-            set one(value) {
-                this._one = value;
-            },
-            set 9(value) {
-                this._nine = value;
-            },
-            set 0b1010(value) {
-                this._ten = value;
-            },
-            set "eleven"(value) {
-                this._eleven = value;
-            }
-        };
-        var b = {
-            get() { return "gift"; },
-            set: function(code) { return "Storing code " + code; }
-        };
-        var c = {
-            ["get"]: "foo",
-            ["set"]: "bar"
-        };
-        var d = {
-            get: "foo",
-            set: "bar"
-        };
-    }
-    expect: {
-        var get = "bar";
-        var a = {
-            get,
-            set: "foo",
-            get bar() {
-                return this.get;
-            },
-            get 5() {
-                return "five";
-            },
-            get 0xf55() {
-                return "f five five";
-            },
-            get "five"() {
-                return 5;
-            },
-            set one(value) {
-                this._one = value;
-            },
-            set 9(value) {
-                this._nine = value;
-            },
-            set 0b1010(value) {
-                this._ten = value;
-            },
-            set "eleven"(value) {
-                this._eleven = value;
-            }
-        };
-        var b = {
-            get() { return "gift"; },
-            set: function(code) { return "Storing code " + code; }
-        };
-        var c = {
-            ["get"]: "foo",
-            ["set"]: "bar"
-        };
-        var d = {
-            get: "foo",
-            set: "bar"
-        };
-    }
-}
-
-getter_setter_mangler: {
-    mangle = {}
-    beautify = {
-        ecma: 6
-    }
-    input: {
-        function f(get,set) {
-            return {
-                get,
-                set,
-                get g(){},
-                set s(n){},
-                c,
-                a:1,
-                m(){}
-            };
-        }
-    }
-    expect_exact: "function f(t,e){return{get:t,set:e,get g(){},set s(t){},c,a:1,m(){}}}"
-}
-
-use_shorthand_opportunity: {
-    beautify = {
-        ecma: 6
-    }
-    input: {
-        var foo = 123;
-        var obj = {foo: foo};
-    }
-    expect_exact: "var foo=123;var obj={foo};"
-}
-
-computed_property_names: {
-    input: {
-        obj({ ["x" + "x"]: 6 });
-    }
-    expect_exact: 'obj({["x"+"x"]:6});'
-}
-
-computed_property_names_evaluated_1: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        obj({
-            [1 + 1]: 2,
-            ["x" + "x"]: 6
-        });
-    }
-    expect_exact: 'obj({[2]:2,["xx"]:6});'
-}
-
-computed_property_names_evaluated_2: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        var foo = something();
-
-        var obj = {
-            [foo]() {
-                return "blah";
-            }
-        }
-    }
-    expect_exact: 'var foo=something();var obj={[foo](){return"blah"}};'
-}
-
-shorthand_properties: {
-    mangle = true;
-    input: {
-        (function() {
-            var prop = 1;
-            const value = {prop};
-            return value;
-        })();
-    }
-    expect: {
-        (function() {
-            var n = 1;
-            const r = {prop:n};
-            return r;
-        })();
-    }
-}
-
-concise_methods: {
-    beautify = {
-        ecma: 6
-    }
-    input: {
-        x = {
-            foo(a, b) {
-                return x;
-            }
-        }
-        y = {
-            foo([{a}]) {
-                return a;
-            },
-            bar(){}
-        }
-    }
-    expect_exact: "x={foo(a,b){return x}};y={foo([{a}]){return a},bar(){}};"
-}
-
-concise_methods_with_computed_property: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        var foo = {
-            [Symbol.iterator]() {
-                return { /* stuff */ }
-            },
-            [1 + 2]() {
-                return 3;
-            },
-            ["1" + "4"]() {
-                return 14;
-            }
-        }
-    }
-    expect: {
-        var foo = {
-            [Symbol.iterator]() {
-                return { /* stuff */ }
-            },
-            [3]() {
-                return 3;
-            },
-            ["14"]() {
-                return 14;
-            }
-        }
-    }
-}
-
-concise_methods_with_computed_property2: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        var foo = {
-            [[1]](){
-                return "success";
-            }
-        };
-        doSomething(foo[[1]]());
-    }
-    expect_exact: 'var foo={[[1]](){return"success"}};doSomething(foo[[1]]());'
-}
-
-concise_methods_with_various_property_names: {
-    input: {
-        var get = "bar";
-        var a = {
-            bar() {
-                return this.get;
-            },
-            5() {
-                return "five";
-            },
-            0xf55() {
-                return "f five five";
-            },
-            "five"() {
-                return 5;
-            },
-            0b1010(value) {
-                this._ten = value;
-            }
-        };
-    }
-    expect: {
-        var get = "bar";
-        var a = {
-            bar() {
-                return this.get;
-            },
-            5() {
-                return "five";
-            },
-            0xf55() {
-                return "f five five";
-            },
-            "five"() {
-                return 5;
-            },
-            0b1010(value) {
-                this._ten = value;
-            }
-        };
-    }
-}
-
-concise_methods_and_mangle_props: {
-    mangle = {
-        properties: {
-            regex: /_/,
-        },
-    }
-    input: {
-        function x() {
-            obj = {
-                _foo() { return 1; }
-            }
-        }
-    }
-    expect: {
-        function x() {
-            obj = {
-                o() { return 1; }
-            }
-        }
-    }
-}
-
-concise_generators: {
-    beautify = {
-        ecma: 6
-    }
-    input: {
-        x = {
-            *foo(a, b) {
-                return x;
-            }
-        }
-        y = {
-            *foo([{a}]) {
-                yield a;
-            },
-            bar(){}
-        }
-    }
-    expect_exact: "x={*foo(a,b){return x}};y={*foo([{a}]){yield a},bar(){}};"
-}
-
-concise_methods_and_keyword_names: {
-    input: {
-        x = {
-            catch() {},
-            throw() {}
-        }
-    }
-    expect: {
-        x={catch(){},throw(){}};
-    }
-}
-
-getter_setter_with_computed_value: {
-    input: {
-        class C {
-            get ['a']() {
-                return 'A';
-            }
-            set ['a'](value) {
-                do_something(a);
-            }
-        }
-        var x = {
-            get [a.b]() {
-                return 42;
-            }
-        };
-        class MyArray extends Array {
-            get [Symbol.species]() {
-                return Array;
-            }
-        }
-    }
-    expect_exact: 'class C{get["a"](){return"A"}set["a"](value){do_something(a)}}var x={get[a.b](){return 42}};class MyArray extends Array{get[Symbol.species](){return Array}}'
-}
-
-property_with_operator_value: {
-    input: {
-        var foo = {
-            "*": 1,
-            get "*"() {
-                return 2;
-            },
-            *"*"() {
-                return 3;
-            },
-            "%": 1,
-            get "%"() {
-                return 2;
-            },
-            *"%"() {
-                return 3;
-            }
-        }
-        class bar {
-            get "*"() {
-                return 1
-            }
-            *"*"() {
-                return 2;
-            }
-            get "%"() {
-                return 1
-            }
-            *"%"() {
-                return 2;
-            }
-        }
-    }
-    expect_exact: 'var foo={"*":1,get"*"(){return 2},*"*"(){return 3},"%":1,get"%"(){return 2},*"%"(){return 3}};class bar{get"*"(){return 1}*"*"(){return 2}get"%"(){return 1}*"%"(){return 2}}'
-}
-
-property_with_unprintable: {
-    input: {
-        var foo = {
-            "\x00\x01": "foo",
-            get "\x00\x01"() {
-                return "bar";
-            },
-            set "\x00\x01"(foo) {
-                save(foo);
-            },
-            *"\x00\x01"() {
-                return "foobar";
-            }
-        }
-        class bar {
-            get "\x00\x01"() {
-                return "bar"
-            }
-            set "\x00\x01"(foo) {
-                save(foo);
-            }
-            *"\x00\x01"() {
-                return "foobar";
-            }
-        }
-    }
-    expect_exact: 'var foo={"\\0\x01":"foo",get"\\0\x01"(){return"bar"},set"\\0\x01"(foo){save(foo)},*"\\0\x01"(){return"foobar"}};class bar{get"\\0\x01"(){return"bar"}set"\\0\x01"(foo){save(foo)}*"\\0\x01"(){return"foobar"}}'
-}
-
-property_with_unprintable_ascii_only: {
-    beautify = {
-        ascii_only: true,
-    }
-    input: {
-        var foo = {
-            "\x00\x01": "foo",
-            get "\x00\x01"() {
-                return "bar";
-            },
-            set "\x00\x01"(foo) {
-                save(foo);
-            },
-            *"\x00\x01"() {
-                return "foobar";
-            }
-        }
-        class bar {
-            get "\x00\x01"() {
-                return "bar"
-            }
-            set "\x00\x01"(foo) {
-                save(foo);
-            }
-            *"\x00\x01"() {
-                return "foobar";
-            }
-        }
-    }
-    expect_exact: 'var foo={"\\0\\x01":"foo",get"\\0\\x01"(){return"bar"},set"\\0\\x01"(foo){save(foo)},*"\\0\\x01"(){return"foobar"}};class bar{get"\\0\\x01"(){return"bar"}set"\\0\\x01"(foo){save(foo)}*"\\0\\x01"(){return"foobar"}}'
-}
-
-property_with_unprintable_ascii_only_static: {
-    beautify = {
-        ascii_only: true
-    }
-    input: {
-        class foo {
-            static get "\x02\x03"() {
-                return "bar";
-            }
-            static set "\x04\x05"(foo) {
-                save(foo);
-            }
-        }
-    }
-    expect_exact: 'class foo{static get"\\x02\\x03"(){return"bar"}static set"\\x04\\x05"(foo){save(foo)}}'
-}
-
-methods_and_getters_with_keep_quoted_props_enabled: {
-    beautify = {
-        quote_style: 3,
-        keep_quoted_props: true,
-    }
-    input: {
-        var obj = {
-            a() {},
-            "b"() {},
-            get c() { return "c"},
-            get "d"() { return "d"},
-            set e(a) { doSomething(a); },
-            set f(a) { doSomething(b); }
-        }
-    }
-    expect_exact: 'var obj={a(){},"b"(){},get c(){return"c"},get"d"(){return"d"},set e(a){doSomething(a)},set f(a){doSomething(b)}};'
-}
-
-allow_assignments_to_property_values: {
-    input: {
-        var foo = {123: foo = 123} = {foo: "456"};
-    }
-    expect: {
-        var foo = {123: foo = 123} = {foo: "456"};
-    }
-}
-
-variable_as_computed_property: {
-    input: {
-        function getLine(header) {
-            return {
-                [header]: {}
-            };
-        }
-    }
-    expect_exact: "function getLine(header){return{[header]:{}}}"
-}
-
-prop_func_to_concise_method: {
-    options = {
-        ecma: 6,
-    }
-    input: {
-        ({
-            emit: function NamedFunctionExpression() {
-                console.log("PASS");
-            },
-            run: function() {
-                this.emit();
-            }
-        }).run();
-    }
-    expect: {
-        ({
-            emit: function NamedFunctionExpression() {
-                console.log("PASS");
-            },
-            run() {
-                this.emit();
-            }
-        }).run();
-    }
-    expect_stdout: "PASS"
-    node_version: ">=6"
-}
-
-prop_arrow_to_concise_method: {
-    options = {
-        ecma: 6,
-    }
-    input: {
-        ({
-            run: () => {
-                console.log("PASS");
-            }
-        }).run();
-    }
-    expect: {
-        ({
-            run() {
-                console.log("PASS");
-            }
-        }).run();
-    }
-    expect_stdout: "PASS"
-    node_version: ">=6"
-}
-
-concise_method_to_prop_arrow: {
-    options = {
-        arrows: true,
-        ecma: 6,
-    }
-    input: {
-        console.log(({ a: () => 1 }).a());
-        console.log(({ a: () => { return 2; } }).a());
-        console.log(({ a() { return 3; } }).a());
-        console.log(({ a() { return this.b; }, b: 4 }).a());
-    }
-    expect: {
-        console.log({ a: () => 1 }.a());
-        console.log({ a: () => 2 }.a());
-        console.log({ a: () => 3 }.a());
-        console.log({ a() { return this.b; }, b: 4 }.a());
-    }
-    expect_stdout: [
-        "1",
-        "2",
-        "3",
-        "4",
-    ]
-    node_version: ">=4"
-}
-
-prop_func_to_async_concise_method: {
-    options = {
-        ecma: 8,
-    }
-    input: {
-        ({
-            run: async function() {
-                console.log("PASS");
-            }
-        }).run();
-    }
-    expect: {
-        ({
-            async run() {
-                console.log("PASS");
-            }
-        }).run();
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-prop_func_to_concise_method_various: {
-    options = {
-        ecma: 6,
-    }
-    input: {
-        ({
-            null: function(x, y){ x(y); },
-            123: function(x, y){ x(y); },
-            "A B": function(x, y){ x(y); },
-            p1: function(x, y){ x(y); },
-            p2: function*(x, y){ yield x(y); },
-            p3: async function(x, y){ await x(y); },
-            [c1]: function(x, y){ x(y); },
-            [c2]: function*(x, y){ yield x(y); },
-            [c3]: async function(x, y){ await x(y); },
-        });
-    }
-    expect: {
-        ({
-            null(x, y) { x(y); },
-            123(x, y) { x(y); },
-            "A B"(x, y) { x(y); },
-            p1(x, y) { x(y); },
-            *p2(x, y) { yield x(y); },
-            async p3(x, y) { await x(y); },
-            [c1](x, y) { x(y); },
-            *[c2](x, y) { yield x(y); },
-            async [c3](x, y) { await x(y); },
-        });
-    }
-}
-
-prop_arrows_to_concise_method_various: {
-    options = {
-        ecma: 6,
-    }
-    input: {
-        ({
-            null: (x, y) => { x(y); },
-            123: (x, y) => { x(y); },
-            "A B": (x, y) => { x(y); },
-            p1: (x, y) => { x(y); },
-            p3: async (x, y) => { await x(y); },
-            [c1]: (x, y) => { x(y); },
-            [c3]: async (x, y) => { await x(y); },
-        });
-    }
-    expect: {
-        ({
-            null(x, y) { x(y); },
-            123(x, y) { x(y); },
-            "A B"(x, y) { x(y); },
-            p1(x, y) { x(y); },
-            async p3(x, y) { await x(y); },
-            [c1](x, y) { x(y); },
-            async [c3](x, y) { await x(y); },
-        });
-    }
-}
-
-prop_arrow_with_this: {
-    options = {
-        ecma: 6,
-    }
-    input: {
-        function run(arg) {
-            console.log(arg === this ? "global" : arg === foo ? "foo" : arg);
-        }
-        var foo = {
-            func_no_this: function() { run(); },
-            func_with_this: function() { run(this); },
-            arrow_no_this: () => { run(); },
-            arrow_with_this: () => { run(this); },
-        };
-        for (var key in foo) foo[key]();
-    }
-    expect: {
-        function run(arg) {
-            console.log(arg === this ? "global" : arg === foo ? "foo" : arg);
-        }
-        var foo = {
-            func_no_this() { run(); },
-            func_with_this() { run(this); },
-            arrow_no_this() { run(); },
-            arrow_with_this: () => { run(this); },
-        };
-        for (var key in foo) foo[key]();
-    }
-    expect_stdout: [
-        "undefined",
-        "foo",
-        "undefined",
-        "global",
-    ]
-    node_version: ">=4"
-}
-
-prop_arrow_with_nested_this: {
-    options = {
-        ecma: 6,
-    }
-    input: {
-        function run(arg) {
-            console.log(arg === this ? "global" : arg === foo ? "foo" : arg);
-        }
-        var foo = {
-            func_func_this: function() { (function() { run(this); })(); },
-            func_arrow_this: function() { (() => { run(this); })(); },
-            arrow_func_this: () => { (function() { run(this); })(); },
-            arrow_arrow_this: () => { (() => { run(this); })(); },
-        };
-        for (var key in foo) foo[key]();
-    }
-    expect: {
-        function run(arg) {
-            console.log(arg === this ? "global" : arg === foo ? "foo" : arg);
-        }
-        var foo = {
-            func_func_this() { (function() { run(this); })(); },
-            func_arrow_this() { (() => { run(this); })(); },
-            arrow_func_this() { (function() { run(this); })(); },
-            arrow_arrow_this: () => { (() => { run(this); })(); },
-        };
-        for (var key in foo) foo[key]();
-    }
-    expect_stdout: [
-        "global",
-        "foo",
-        "global",
-        "global",
-    ]
-    node_version: ">=4"
-}

test/compress/parameters.js

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

test/compress/pure_funcs.js

@@ -293,3 +293,245 @@ unary: {
         bar();
     }
 }
+
+issue_2629_1: {
+    options = {
+        side_effects: true,
+    }
+    beautify = {
+        comments: "all",
+    }
+    input: {
+        /*@__PURE__*/ a();
+        /*@__PURE__*/ (b());
+        (/*@__PURE__*/ c)();
+        (/*@__PURE__*/ d());
+    }
+    expect_exact: [
+        "/* */c();",
+    ]
+}
+
+issue_2629_2: {
+    options = {
+        side_effects: true,
+    }
+    beautify = {
+        comments: "all",
+    }
+    input: {
+        /*@__PURE__*/ a(1)(2)(3);
+        /*@__PURE__*/ (b(1))(2)(3);
+        /*@__PURE__*/ (c(1)(2))(3);
+        /*@__PURE__*/ (d(1)(2)(3));
+        (/*@__PURE__*/ e)(1)(2)(3);
+        (/*@__PURE__*/ f(1))(2)(3);
+        (/*@__PURE__*/ g(1)(2))(3);
+        (/*@__PURE__*/ h(1)(2)(3));
+    }
+    expect_exact: [
+        "/* */e(1)(2)(3);",
+        "/* */f(1)(2)(3);",
+        "/* */g(1)(2)(3);",
+    ]
+}
+
+issue_2629_3: {
+    options = {
+        side_effects: true,
+    }
+    beautify = {
+        comments: "all",
+    }
+    input: {
+        /*@__PURE__*/ a.x(1).y(2).z(3);
+        /*@__PURE__*/ (b.x)(1).y(2).z(3);
+        /*@__PURE__*/ (c.x(1)).y(2).z(3);
+        /*@__PURE__*/ (d.x(1).y)(2).z(3);
+        /*@__PURE__*/ (e.x(1).y(2)).z(3);
+        /*@__PURE__*/ (f.x(1).y(2).z)(3);
+        /*@__PURE__*/ (g.x(1).y(2).z(3));
+        (/*@__PURE__*/ h).x(1).y(2).z(3);
+        (/*@__PURE__*/ i.x)(1).y(2).z(3);
+        (/*@__PURE__*/ j.x(1)).y(2).z(3);
+        (/*@__PURE__*/ k.x(1).y)(2).z(3);
+        (/*@__PURE__*/ l.x(1).y(2)).z(3);
+        (/*@__PURE__*/ m.x(1).y(2).z)(3);
+        (/*@__PURE__*/ n.x(1).y(2).z(3));
+    }
+    expect_exact: [
+        "/* */h.x(1).y(2).z(3);",
+        "/* */i.x(1).y(2).z(3);",
+        "/* */j.x(1).y(2).z(3);",
+        "/* */k.x(1).y(2).z(3);",
+        "/* */l.x(1).y(2).z(3);",
+        "/* */m.x(1).y(2).z(3);",
+    ]
+}
+
+issue_2629_4: {
+    options = {
+        side_effects: true,
+    }
+    input: {
+        (/*@__PURE__*/ x(), y());
+        (w(), /*@__PURE__*/ x(), y());
+    }
+    expect: {
+        y();
+        w(), y();
+    }
+}
+
+issue_2629_5: {
+    options = {
+        side_effects: true,
+    }
+    input: {
+        [ /*@__PURE__*/ x() ];
+        [ /*@__PURE__*/ x(), y() ];
+        [ w(), /*@__PURE__*/ x(), y() ];
+    }
+    expect: {
+        y();
+        w(), y();
+    }
+}
+
+issue_2638: {
+    options = {
+        side_effects: true,
+    }
+    beautify = {
+        comments: "all",
+    }
+    input: {
+        /*@__PURE__*/(g() || h())(x(), y());
+        (/*@__PURE__*/ (a() || b()))(c(), d());
+    }
+    expect_exact: [
+        "/* */x(),y();",
+        "/* */(a()||b())(c(),d());",
+    ]
+}
+
+issue_2705_1: {
+    options = {
+        side_effects: true,
+    }
+    beautify = {
+        comments: "all",
+    }
+    input: {
+        /*@__PURE__*/ new a();
+        /*@__PURE__*/ (new b());
+        new (/*@__PURE__*/ c)();
+        (/*@__PURE__*/ new d());
+    }
+    expect_exact: [
+        "new/* */c;",
+    ]
+}
+
+issue_2705_2: {
+    options = {
+        side_effects: true,
+    }
+    beautify = {
+        comments: "all",
+    }
+    input: {
+        /*@__PURE__*/ new a(1)(2)(3);
+        /*@__PURE__*/ new (b(1))(2)(3);
+        /*@__PURE__*/ new (c(1)(2))(3);
+        /*@__PURE__*/ new (d(1)(2)(3));
+        new (/*@__PURE__*/ e)(1)(2)(3);
+        (/*@__PURE__*/ new f(1))(2)(3);
+        (/*@__PURE__*/ new g(1)(2))(3);
+        (/*@__PURE__*/ new h(1)(2)(3));
+    }
+    expect_exact: [
+        "new/* */e(1)(2)(3);",
+        "/* */new f(1)(2)(3);",
+        "/* */new g(1)(2)(3);",
+    ]
+}
+
+issue_2705_3: {
+    options = {
+        side_effects: true,
+    }
+    beautify = {
+        comments: "all",
+    }
+    input: {
+        /*@__PURE__*/ new a.x(1).y(2).z(3);
+        /*@__PURE__*/ new (b.x)(1).y(2).z(3);
+        /*@__PURE__*/ new (c.x(1)).y(2).z(3);
+        /*@__PURE__*/ new (d.x(1).y)(2).z(3);
+        /*@__PURE__*/ new (e.x(1).y(2)).z(3);
+        /*@__PURE__*/ new (f.x(1).y(2).z)(3);
+        /*@__PURE__*/ new (g.x(1).y(2).z(3));
+        new (/*@__PURE__*/ h).x(1).y(2).z(3);
+        /* */ new (/*@__PURE__*/ i.x)(1).y(2).z(3);
+        (/*@__PURE__*/ new j.x(1)).y(2).z(3);
+        (/*@__PURE__*/ new k.x(1).y)(2).z(3);
+        (/*@__PURE__*/ new l.x(1).y(2)).z(3);
+        (/*@__PURE__*/ new m.x(1).y(2).z)(3);
+        (/*@__PURE__*/ new n.x(1).y(2).z(3));
+    }
+    expect_exact: [
+        "new/* */h.x(1).y(2).z(3);",
+        "/* */new/* */i.x(1).y(2).z(3);",
+        "/* */new j.x(1).y(2).z(3);",
+        "/* */new k.x(1).y(2).z(3);",
+        "/* */new l.x(1).y(2).z(3);",
+        "/* */new m.x(1).y(2).z(3);",
+    ]
+}
+
+issue_2705_4: {
+    options = {
+        side_effects: true,
+    }
+    input: {
+        (/*@__PURE__*/ new x(), y());
+        (w(), /*@__PURE__*/ new x(), y());
+    }
+    expect: {
+        y();
+        w(), y();
+    }
+}
+
+issue_2705_5: {
+    options = {
+        side_effects: true,
+    }
+    input: {
+        [ /*@__PURE__*/ new x() ];
+        [ /*@__PURE__*/ new x(), y() ];
+        [ w(), /*@__PURE__*/ new x(), y() ];
+    }
+    expect: {
+        y();
+        w(), y();
+    }
+}
+
+issue_2705_6: {
+    options = {
+        side_effects: true,
+    }
+    beautify = {
+        comments: "all",
+    }
+    input: {
+        /*@__PURE__*/new (g() || h())(x(), y());
+        /* */ new (/*@__PURE__*/ (a() || b()))(c(), d());
+    }
+    expect_exact: [
+        "/* */x(),y();",
+        "/* */new(/* */a()||b())(c(),d());",
+    ]
+}

test/compress/pure_getters.js

@@ -1,6 +1,7 @@
 strict: {
     options = {
         pure_getters: "strict",
+        reduce_funcs: false,
         reduce_vars: false,
         side_effects: true,
         toplevel: true,
@@ -30,6 +31,7 @@ strict: {
 strict_reduce_vars: {
     options = {
         pure_getters: "strict",
+        reduce_funcs: true,
         reduce_vars: true,
         side_effects: true,
         toplevel: true,
@@ -58,6 +60,7 @@ strict_reduce_vars: {
 unsafe: {
     options = {
         pure_getters: true,
+        reduce_funcs: false,
         reduce_vars: false,
         side_effects: true,
         toplevel: true,
@@ -84,6 +87,7 @@ unsafe: {
 unsafe_reduce_vars: {
     options = {
         pure_getters: true,
+        reduce_funcs: true,
         reduce_vars: true,
         side_effects: true,
         toplevel: true,
@@ -181,10 +185,11 @@ impure_getter_2: {
 
 issue_2110_1: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         pure_getters: "strict",
         sequences: true,
         side_effects: true,
+        reduce_funcs: true,
         reduce_vars: true,
         unused: true,
     }
@@ -215,6 +220,7 @@ issue_2110_2: {
     options = {
         collapse_vars: true,
         pure_getters: "strict",
+        reduce_funcs: true,
         reduce_vars: true,
         unused: true,
     }
@@ -247,6 +253,7 @@ set_immutable_1: {
         collapse_vars: true,
         evaluate: true,
         pure_getters: "strict",
+        reduce_funcs: true,
         reduce_vars: true,
         toplevel: true,
         unused: true,
@@ -267,9 +274,10 @@ set_immutable_1: {
 
 set_immutable_2: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         pure_getters: "strict",
+        reduce_funcs: true,
         reduce_vars: true,
         sequences: true,
         side_effects: true,
@@ -293,6 +301,7 @@ set_immutable_3: {
         collapse_vars: true,
         evaluate: true,
         pure_getters: "strict",
+        reduce_funcs: true,
         reduce_vars: true,
         toplevel: true,
         unused: true,
@@ -315,9 +324,10 @@ set_immutable_3: {
 
 set_immutable_4: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         pure_getters: "strict",
+        reduce_funcs: true,
         reduce_vars: true,
         sequences: true,
         side_effects: true,
@@ -338,11 +348,63 @@ set_immutable_4: {
     expect_stdout: true
 }
 
+set_immutable_5: {
+    options = {
+        collapse_vars: true,
+        conditionals: true,
+        evaluate: true,
+        pure_getters: "strict",
+        reduce_funcs: true,
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        "use strict";
+        var a = 1;
+        a.foo += "";
+        if (a.foo) console.log("FAIL");
+        else console.log("PASS");
+    }
+    expect: {
+        "use strict";
+        1..foo += "";
+        1..foo ? console.log("FAIL") : console.log("PASS");
+    }
+    expect_stdout: true
+}
+
+set_immutable_6: {
+    options = {
+        collapse_vars: true,
+        conditionals: true,
+        evaluate: true,
+        pure_getters: "strict",
+        reduce_funcs: true,
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = 1;
+        a.foo += "";
+        if (a.foo) console.log("FAIL");
+        else console.log("PASS");
+    }
+    expect: {
+        1..foo ? console.log("FAIL") : console.log("PASS");
+    }
+    expect_stdout: true
+}
+
 set_mutable_1: {
     options = {
         collapse_vars: true,
         evaluate: true,
         pure_getters: "strict",
+        reduce_funcs: true,
         reduce_vars: true,
         unused: true,
     }
@@ -364,9 +426,10 @@ set_mutable_1: {
 
 set_mutable_2: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         pure_getters: "strict",
+        reduce_funcs: true,
         reduce_vars: true,
         sequences: true,
         side_effects: true,
@@ -386,82 +449,9 @@ set_mutable_2: {
     expect_stdout: "PASS"
 }
 
-issue_2265_1: {
-    options = {
-        pure_getters: "strict",
-        side_effects: true,
-    }
-    input: {
-        ({ ...{} }).p;
-        ({ ...g }).p;
-    }
-    expect: {
-        ({ ...g }).p;
-    }
-}
-
-issue_2265_2: {
-    options = {
-        pure_getters: "strict",
-        reduce_vars: true,
-        side_effects: true,
-        toplevel: true,
-    }
-    input: {
-        var a = {
-            get b() {
-                throw 0;
-            }
-        };
-        ({...a}).b;
-    }
-    expect: {
-        var a = {
-            get b() {
-                throw 0;
-            }
-        };
-        ({...a}).b;
-    }
-}
-
-issue_2265_3: {
-    options = {
-        pure_getters: "strict",
-        reduce_vars: true,
-        side_effects: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var a = {
-            set b() {
-                throw 0;
-            }
-        };
-        ({...a}).b;
-    }
-    expect: {}
-}
-
-issue_2265_4: {
-    options = {
-        pure_getters: "strict",
-        reduce_vars: true,
-        side_effects: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var a = { b: 1 };
-        ({...a}).b;
-    }
-    expect: {}
-}
-
 issue_2313_1: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         pure_getters: "strict",
         sequences: true,
@@ -507,7 +497,7 @@ issue_2313_1: {
 
 issue_2313_2: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         pure_getters: true,
         sequences: true,
@@ -673,50 +663,61 @@ issue_2313_6: {
     }
 }
 
-issue_2313_7: {
+issue_2678: {
     options = {
-        collapse_vars: true,
-        conditionals: true,
-        pure_getters: true,
+        pure_getters: "strict",
+        side_effects: true,
     }
     input: {
-        var a = 0, b = 0;
-        class foo {
-            get c() {
-                a++;
-                return 42;
-            }
-            set c(c) {
-                b++;
-            }
-        }
-        class bar extends foo {
-            d() {
-                super.c++;
-                if (super.c) console.log(a, b);
-            }
-        }
-        new bar().d();
+        var a = 1, c = "FAIL";
+        (function f() {
+            (a-- && f()).p;
+            return {
+                get p() {
+                    c = "PASS";
+                }
+            };
+        })();
+        console.log(c);
     }
     expect: {
-        var a = 0, b = 0;
-        class foo {
-            get c() {
-                a++;
-                return 42;
-            }
-            set c(c) {
-                b++;
-            }
-        }
-        class bar extends foo {
-            d() {
-                super.c++;
-                super.c && console.log(a, b);
-            }
-        }
-        new bar().d();
+        var a = 1, c = "FAIL";
+        (function f() {
+            (a-- && f()).p;
+            return {
+                get p() {
+                    c = "PASS";
+                }
+            };
+        })();
+        console.log(c);
     }
-    expect_stdout: "2 1"
-    node_version: ">=6"
+    expect_stdout: "PASS"
+}
+
+issue_2838: {
+    options = {
+        pure_getters: true,
+        side_effects: true,
+    }
+    input: {
+        function f(a, b) {
+            (a || b).c = "PASS";
+            (function() {
+                return f(a, b);
+            }).prototype.foo = "bar";
+        }
+        var o = {};
+        f(null, o);
+        console.log(o.c);
+    }
+    expect: {
+        function f(a, b) {
+            (a || b).c = "PASS";
+        }
+        var o = {};
+        f(null, o);
+        console.log(o.c);
+    }
+    expect_stdout: "PASS"
 }

test/compress/rename.js

@@ -0,0 +1,536 @@
+mangle_catch: {
+    rename = true
+    options = {
+        ie8: false,
+        toplevel: false,
+    }
+    mangle = {
+        ie8: false,
+        toplevel: false,
+    }
+    input: {
+        var a = "FAIL";
+        try {
+            throw 1;
+        } catch (args) {
+            a = "PASS";
+        }
+        console.log(a);
+    }
+    expect_exact: 'var a="FAIL";try{throw 1}catch(o){a="PASS"}console.log(a);'
+    expect_stdout: "PASS"
+}
+
+mangle_catch_ie8: {
+    rename = true
+    options = {
+        ie8: true,
+        toplevel: false,
+    }
+    mangle = {
+        ie8: true,
+        toplevel: false,
+    }
+    input: {
+        var a = "FAIL";
+        try {
+            throw 1;
+        } catch (args) {
+            a = "PASS";
+        }
+        console.log(a);
+    }
+    expect_exact: 'var a="FAIL";try{throw 1}catch(args){a="PASS"}console.log(a);'
+    expect_stdout: "PASS"
+}
+
+mangle_catch_var: {
+    rename = true
+    options = {
+        ie8: false,
+        toplevel: false,
+    }
+    mangle = {
+        ie8: false,
+        toplevel: false,
+    }
+    input: {
+        var a = "FAIL";
+        try {
+            throw 1;
+        } catch (args) {
+            var a = "PASS";
+        }
+        console.log(a);
+    }
+    expect_exact: 'var a="FAIL";try{throw 1}catch(o){var a="PASS"}console.log(a);'
+    expect_stdout: "PASS"
+}
+
+mangle_catch_var_ie8: {
+    rename = true
+    options = {
+        ie8: true,
+        toplevel: false,
+    }
+    mangle = {
+        ie8: true,
+        toplevel: false,
+    }
+    input: {
+        var a = "FAIL";
+        try {
+            throw 1;
+        } catch (args) {
+            var a = "PASS";
+        }
+        console.log(a);
+    }
+    expect_exact: 'var a="FAIL";try{throw 1}catch(args){var a="PASS"}console.log(a);'
+    expect_stdout: "PASS"
+}
+
+mangle_catch_toplevel: {
+    rename = true
+    options = {
+        ie8: false,
+        toplevel: true,
+    }
+    mangle = {
+        ie8: false,
+        toplevel: true,
+    }
+    input: {
+        var a = "FAIL";
+        try {
+            throw 1;
+        } catch (args) {
+            a = "PASS";
+        }
+        console.log(a);
+    }
+    expect_exact: 'var o="FAIL";try{throw 1}catch(c){o="PASS"}console.log(o);'
+    expect_stdout: "PASS"
+}
+
+mangle_catch_ie8_toplevel: {
+    rename = true
+    options = {
+        ie8: true,
+        toplevel: true,
+    }
+    mangle = {
+        ie8: true,
+        toplevel: true,
+    }
+    input: {
+        var a = "FAIL";
+        try {
+            throw 1;
+        } catch (args) {
+            a = "PASS";
+        }
+        console.log(a);
+    }
+    expect_exact: 'var o="FAIL";try{throw 1}catch(c){o="PASS"}console.log(o);'
+    expect_stdout: "PASS"
+}
+
+mangle_catch_var_toplevel: {
+    rename = true
+    options = {
+        ie8: false,
+        toplevel: true,
+    }
+    mangle = {
+        ie8: false,
+        toplevel: true,
+    }
+    input: {
+        var a = "FAIL";
+        try {
+            throw 1;
+        } catch (args) {
+            var a = "PASS";
+        }
+        console.log(a);
+    }
+    expect_exact: 'var o="FAIL";try{throw 1}catch(r){var o="PASS"}console.log(o);'
+    expect_stdout: "PASS"
+}
+
+mangle_catch_var_ie8_toplevel: {
+    rename = true
+    options = {
+        ie8: true,
+        toplevel: true,
+    }
+    mangle = {
+        ie8: true,
+        toplevel: true,
+    }
+    input: {
+        var a = "FAIL";
+        try {
+            throw 1;
+        } catch (args) {
+            var a = "PASS";
+        }
+        console.log(a);
+    }
+    expect_exact: 'var o="FAIL";try{throw 1}catch(r){var o="PASS"}console.log(o);'
+    expect_stdout: "PASS"
+}
+
+mangle_catch_redef_1: {
+    rename = true
+    options = {
+        ie8: false,
+        toplevel: false,
+    }
+    mangle = {
+        ie8: false,
+        toplevel: false,
+    }
+    input: {
+        var a = "PASS";
+        try {
+            throw "FAIL1";
+        } catch (a) {
+            var a = "FAIL2";
+        }
+        console.log(a);
+    }
+    expect_exact: 'var a="PASS";try{throw"FAIL1"}catch(a){var a="FAIL2"}console.log(a);'
+    expect_stdout: "PASS"
+}
+
+mangle_catch_redef_1_ie8: {
+    rename = true
+    options = {
+        ie8: true,
+        toplevel: false,
+    }
+    mangle = {
+        ie8: true,
+        toplevel: false,
+    }
+    input: {
+        var a = "PASS";
+        try {
+            throw "FAIL1";
+        } catch (a) {
+            var a = "FAIL2";
+        }
+        console.log(a);
+    }
+    expect_exact: 'var a="PASS";try{throw"FAIL1"}catch(a){var a="FAIL2"}console.log(a);'
+    expect_stdout: "PASS"
+}
+
+mangle_catch_redef_1_toplevel: {
+    rename = true
+    options = {
+        ie8: false,
+        toplevel: true,
+    }
+    mangle = {
+        ie8: false,
+        toplevel: true,
+    }
+    input: {
+        var a = "PASS";
+        try {
+            throw "FAIL1";
+        } catch (a) {
+            var a = "FAIL2";
+        }
+        console.log(a);
+    }
+    expect_exact: 'var o="PASS";try{throw"FAIL1"}catch(o){var o="FAIL2"}console.log(o);'
+    expect_stdout: "PASS"
+}
+
+mangle_catch_redef_1_ie8_toplevel: {
+    rename = true
+    options = {
+        ie8: true,
+        toplevel: true,
+    }
+    mangle = {
+        ie8: true,
+        toplevel: true,
+    }
+    input: {
+        var a = "PASS";
+        try {
+            throw "FAIL1";
+        } catch (a) {
+            var a = "FAIL2";
+        }
+        console.log(a);
+    }
+    expect_exact: 'var o="PASS";try{throw"FAIL1"}catch(o){var o="FAIL2"}console.log(o);'
+    expect_stdout: "PASS"
+}
+
+mangle_catch_redef_2: {
+    rename = true
+    options = {
+        ie8: false,
+        toplevel: false,
+    }
+    mangle = {
+        ie8: false,
+        toplevel: false,
+    }
+    input: {
+        try {
+            throw "FAIL1";
+        } catch (a) {
+            var a = "FAIL2";
+        }
+        console.log(a);
+    }
+    expect_exact: 'try{throw"FAIL1"}catch(a){var a="FAIL2"}console.log(a);'
+    expect_stdout: "undefined"
+}
+
+mangle_catch_redef_2_ie8: {
+    rename = true
+    options = {
+        ie8: true,
+        toplevel: false,
+    }
+    mangle = {
+        ie8: true,
+        toplevel: false,
+    }
+    input: {
+        try {
+            throw "FAIL1";
+        } catch (a) {
+            var a = "FAIL2";
+        }
+        console.log(a);
+    }
+    expect_exact: 'try{throw"FAIL1"}catch(a){var a="FAIL2"}console.log(a);'
+    expect_stdout: "undefined"
+}
+
+mangle_catch_redef_2_toplevel: {
+    rename = true
+    options = {
+        ie8: false,
+        toplevel: true,
+    }
+    mangle = {
+        ie8: false,
+        toplevel: true,
+    }
+    input: {
+        try {
+            throw "FAIL1";
+        } catch (a) {
+            var a = "FAIL2";
+        }
+        console.log(a);
+    }
+    expect_exact: 'try{throw"FAIL1"}catch(o){var o="FAIL2"}console.log(o);'
+    expect_stdout: "undefined"
+}
+
+mangle_catch_redef_2_ie8_toplevel: {
+    rename = true
+    options = {
+        ie8: true,
+        toplevel: true,
+    }
+    mangle = {
+        ie8: true,
+        toplevel: true,
+    }
+    input: {
+        try {
+            throw "FAIL1";
+        } catch (a) {
+            var a = "FAIL2";
+        }
+        console.log(a);
+    }
+    expect_exact: 'try{throw"FAIL1"}catch(o){var o="FAIL2"}console.log(o);'
+    expect_stdout: "undefined"
+}
+
+issue_2120_1: {
+    rename = true
+    mangle = {
+        ie8: false,
+    }
+    input: {
+        "aaaaaaaa";
+        var a = 1, b = "FAIL";
+        try {
+            throw 1;
+        } catch (c) {
+            try {
+                throw 0;
+            } catch (a) {
+                if (c) b = "PASS";
+            }
+        }
+        console.log(b);
+    }
+    expect: {
+        "aaaaaaaa";
+        var a = 1, b = "FAIL";
+        try {
+            throw 1;
+        } catch (t) {
+            try {
+                throw 0;
+            } catch (a) {
+                if (t) b = "PASS";
+            }
+        }
+        console.log(b);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_2120_2: {
+    rename = true
+    mangle = {
+        ie8: true,
+    }
+    input: {
+        "aaaaaaaa";
+        var a = 1, b = "FAIL";
+        try {
+            throw 1;
+        } catch (c) {
+            try {
+                throw 0;
+            } catch (a) {
+                if (c) b = "PASS";
+            }
+        }
+        console.log(b);
+    }
+    expect: {
+        "aaaaaaaa";
+        var a = 1, b = "FAIL";
+        try {
+            throw 1;
+        } catch (c) {
+            try {
+                throw 0;
+            } catch (a) {
+                if (c) b = "PASS";
+            }
+        }
+        console.log(b);
+    }
+    expect_stdout: "PASS"
+}
+function_iife_catch: {
+    rename = true
+    mangle = {
+        ie8: false,
+    }
+    input: {
+        function f(n) {
+            !function() {
+                try {
+                    throw 0;
+                } catch (n) {
+                    var a = 1;
+                    console.log(n, a);
+                }
+            }();
+        }
+        f();
+    }
+    expect_exact: "function f(o){!function(){try{throw 0}catch(c){var o=1;console.log(c,o)}}()}f();"
+    expect_stdout: "0 1"
+}
+
+function_iife_catch_ie8: {
+    rename = true
+    mangle = {
+        ie8: true,
+    }
+    input: {
+        function f(n) {
+            !function() {
+                try {
+                    throw 0;
+                } catch (n) {
+                    var a = 1;
+                    console.log(n, a);
+                }
+            }();
+        }
+        f();
+    }
+    expect_exact: "function f(o){!function(){try{throw 0}catch(o){var c=1;console.log(o,c)}}()}f();"
+    expect_stdout: "0 1"
+}
+
+function_catch_catch: {
+    rename = true
+    mangle = {
+        ie8: false,
+    }
+    input: {
+        var o = 0;
+        function f() {
+            try {
+                throw 1;
+            } catch (c) {
+                try {
+                    throw 2;
+                } catch (o) {
+                    var o = 3;
+                    console.log(o);
+                }
+            }
+            console.log(o);
+        }
+        f();
+    }
+    expect_exact: "var o=0;function f(){try{throw 1}catch(c){try{throw 2}catch(o){var o=3;console.log(o)}}console.log(o)}f();"
+    expect_stdout: [
+        "3",
+        "undefined",
+    ]
+}
+
+function_catch_catch_ie8: {
+    rename = true
+    mangle = {
+        ie8: true,
+    }
+    input: {
+        var o = 0;
+        function f() {
+            try {
+                throw 1;
+            } catch (c) {
+                try {
+                    throw 2;
+                } catch (o) {
+                    var o = 3;
+                    console.log(o);
+                }
+            }
+            console.log(o);
+        }
+        f();
+    }
+    expect_exact: "var o=0;function f(){try{throw 1}catch(c){try{throw 2}catch(o){var o=3;console.log(o)}}console.log(o)}f();"
+    expect_stdout: [
+        "3",
+        "undefined",
+    ]
+}

test/compress/return_undefined.js

@@ -17,7 +17,6 @@ return_undefined: {
         keep_fnames   : false,
         hoist_vars    : true,
         join_vars     : true,
-        cascade       : true,
         negate_iife   : true
     };
     input: {
@@ -122,3 +121,25 @@ return_undefined: {
         }
     }
 }
+
+return_void: {
+    options = {
+        if_return: true,
+        inline: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        function f() {
+            function g() {
+                h();
+            }
+            return g();
+        }
+    }
+    expect: {
+        function f() {
+            h();
+        }
+    }
+}

test/compress/screw-ie8.js

@@ -187,6 +187,7 @@ dont_screw_try_catch_undefined: {
 reduce_vars: {
     options = {
         evaluate: true,
+        reduce_funcs: true,
         reduce_vars: true,
         ie8: true,
         unused: true,

test/compress/sequences.js

@@ -252,13 +252,12 @@ negate_iife_for: {
     input: {
         (function() {})();
         for (i = 0; i < 5; i++) console.log(i);
-
         (function() {})();
-        for (; i < 5; i++) console.log(i);
+        for (; i < 10; i++) console.log(i);
     }
     expect: {
         for (!function() {}(), i = 0; i < 5; i++) console.log(i);
-        for (function() {}(); i < 5; i++) console.log(i);
+        for (!function() {}(); i < 10; i++) console.log(i);
     }
     expect_stdout: true
 }
@@ -289,7 +288,7 @@ unsafe_undefined: {
         if_return: true,
         sequences: true,
         side_effects: true,
-        unsafe: true,
+        unsafe_undefined: true,
     }
     input: {
         function f(undefined) {
@@ -318,7 +317,7 @@ unsafe_undefined: {
 
 issue_1685: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         side_effects: true,
     }
     input: {
@@ -342,7 +341,7 @@ issue_1685: {
 
 func_def_1: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         side_effects: true,
     }
     input: {
@@ -362,7 +361,7 @@ func_def_1: {
 
 func_def_2: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         side_effects: true,
     }
     input: {
@@ -380,7 +379,7 @@ func_def_2: {
 
 func_def_3: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         side_effects: true,
     }
     input: {
@@ -402,7 +401,7 @@ func_def_3: {
 
 func_def_4: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         side_effects: true,
     }
     input: {
@@ -428,7 +427,7 @@ func_def_4: {
 
 func_def_5: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         side_effects: true,
     }
     input: {
@@ -635,7 +634,7 @@ side_effects: {
 
 side_effects_cascade_1: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         sequences: true,
         side_effects: true,
@@ -656,7 +655,7 @@ side_effects_cascade_1: {
 
 side_effects_cascade_2: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         side_effects: true,
     }
     input: {
@@ -678,7 +677,7 @@ side_effects_cascade_2: {
 
 side_effects_cascade_3: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         side_effects: true,
     }
@@ -693,14 +692,14 @@ side_effects_cascade_3: {
     expect: {
         function f(a, b) {
             !(b += a) && ((b = a) || (b -= a, b ^= a)),
-            --a;
+            a--;
         }
     }
 }
 
 issue_27: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         passes: 2,
         sequences: true,
         side_effects: true,
@@ -720,34 +719,10 @@ issue_27: {
     }
 }
 
-reassign_const: {
-    options = {
-        cascade: true,
-        sequences: true,
-        side_effects: true,
-    }
-    input: {
-        function f() {
-            const a = 1;
-            a++;
-            return a;
-        }
-        console.log(f());
-    }
-    expect: {
-        function f() {
-            const a = 1;
-            return a++, a;
-        }
-        console.log(f());
-    }
-    expect_stdout: true
-}
-
 issue_2062: {
     options = {
         booleans: true,
-        cascade: true,
+        collapse_vars: true,
         conditionals: true,
         side_effects: true,
     }
@@ -766,7 +741,7 @@ issue_2062: {
 
 issue_2313: {
     options = {
-        cascade: true,
+        collapse_vars: true,
         sequences: true,
         side_effects: true,
     }
@@ -804,3 +779,101 @@ issue_2313: {
     }
     expect_stdout: "2 1"
 }
+
+cascade_assignment_in_return: {
+    options = {
+        collapse_vars: true,
+        unused: true,
+    }
+    input: {
+        function f(a, b) {
+            return a = x(), b(a);
+        }
+    }
+    expect: {
+        function f(a, b) {
+            return b(x());
+        }
+    }
+}
+
+hoist_defun: {
+    options = {
+        join_vars: true,
+        sequences: true,
+    }
+    input: {
+        x();
+        function f() {}
+        y();
+    }
+    expect: {
+        function f() {}
+        x(), y();
+    }
+}
+
+hoist_decl: {
+    options = {
+        join_vars: true,
+        sequences: true,
+    }
+    input: {
+        var a;
+        w();
+        var b = x();
+        y();
+        for (var c; 0;) z();
+        var d;
+    }
+    expect: {
+        var a;
+        w();
+        var b = x(), c, d;
+        for (y(); 0;) z();
+    }
+}
+
+for_init_var: {
+    options = {
+        join_vars: true,
+        unused: false,
+    }
+    input: {
+        var a = "PASS";
+        (function() {
+            var b = 42;
+            for (var c = 5; c > 0;) c--;
+            a = "FAIL";
+            var a;
+        })();
+        console.log(a);
+    }
+    expect: {
+        var a = "PASS";
+        (function() {
+            for (var b = 42, c = 5, a; c > 0;) c--;
+            a = "FAIL";
+        })();
+        console.log(a);
+    }
+    expect_stdout: "PASS"
+}
+
+forin: {
+    options = {
+        sequences: true,
+    }
+    input: {
+        var o = [];
+        o.push("PASS");
+        for (var a in o)
+            console.log(o[a]);
+    }
+    expect: {
+        var o = [];
+        for (var a in o.push("PASS"), o)
+            console.log(o[a]);
+    }
+    expect_stdout: "PASS"
+}

test/compress/super.js

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

test/compress/switch.js

@@ -714,6 +714,7 @@ issue_1705_2: {
     options = {
         dead_code: true,
         evaluate: true,
+        reduce_funcs: true,
         reduce_vars: true,
         sequences: true,
         side_effects: true,
@@ -816,3 +817,50 @@ issue_1758: {
     }
     expect_stdout: "0 3"
 }
+
+issue_2535: {
+    options = {
+        evaluate: true,
+        dead_code: true,
+        switches: true,
+    }
+    input: {
+        switch(w(), 42) {
+            case 13: x();
+            case 42: y();
+            default: z();
+        }
+    }
+    expect: {
+        w(), 42;
+        42;
+        y();
+        z();
+    }
+}
+
+issue_1750: {
+    options = {
+        dead_code: true,
+        evaluate: true,
+        switches: true,
+    }
+    input: {
+        var a = 0, b = 1;
+        switch (true) {
+          case a, true:
+          default:
+            b = 2;
+          case true:
+        }
+        console.log(a, b);
+    }
+    expect: {
+        var a = 0, b = 1;
+        true;
+        a, true;
+        b = 2;
+        console.log(a, b);
+    }
+    expect_stdout: "0 2"
+}

test/compress/template-string.js

@@ -1,402 +0,0 @@
-template_strings: {
-    beautify = {
-        quote_style: 3
-    }
-    input: {
-        ``;
-        `xx\`x`;
-        `${ foo + 2 }`;
-        ` foo ${ bar + `baz ${ qux }` }`;
-    }
-    expect_exact: "``;`xx\\`x`;`${foo+2}`;` foo ${bar+`baz ${qux}`}`;";
-}
-
-template_string_prefixes: {
-    beautify = {
-        quote_style: 3
-    }
-    input: {
-        String.raw`foo`;
-        foo `bar`;
-    }
-    expect_exact: "String.raw`foo`;foo`bar`;";
-}
-
-template_strings_ascii_only: {
-    beautify = {
-        ascii_only: true,
-        quote_style: 3
-    }
-    input: {
-        var foo = `foo
-        bar
-        ↂωↂ`;
-        var bar = `\``;
-    }
-    expect_exact: "var foo=`foo\\n        bar\\n        \\u2182\\u03c9\\u2182`;var bar=`\\``;"
-}
-
-template_strings_without_ascii_only: {
-    beautify = {
-        quote_style: 3
-    }
-    input: {
-        var foo = `foo
-        bar
-        ↂωↂ`
-    }
-    expect_exact: "var foo=`foo\\n        bar\\n        ↂωↂ`;"
-}
-
-template_string_with_constant_expression: {
-    options = {
-        evaluate: true
-    }
-    beautify = {
-        quote_style: 3
-    }
-    input: {
-        var foo = `${4 + 4} equals 4 + 4`;
-    }
-    expect: {
-        var foo = `8 equals 4 + 4`;
-    }
-}
-
-template_string_with_predefined_constants: {
-    options = {
-        evaluate: true
-    }
-    beautify = {
-        quote_style: 3
-    }
-    input: {
-        var foo = `This is ${undefined}`;
-        var bar = `This is ${NaN}`;
-        var baz = `This is ${null}`;
-        var foofoo = `This is ${Infinity}`;
-        var foobar = "This is ${1/0}";
-        var foobaz = 'This is ${1/0}';
-        var barfoo = "This is ${NaN}";
-        var bazfoo = "This is ${null}";
-        var bazbaz = `This is ${1/0}`;
-        var barbar = `This is ${0/0}`;
-        var barbar = "This is ${0/0}";
-        var barber = 'This is ${0/0}';
-
-        var a = `${4**11}`; // 8 in template vs 7 chars - 4194304
-        var b = `${4**12}`; // 8 in template vs 8 chars - 16777216
-        var c = `${4**14}`; // 8 in template vs 9 chars - 268435456
-    }
-    expect: {
-        var foo = `This is undefined`;
-        var bar = `This is NaN`;
-        var baz = `This is null`;
-        var foofoo = `This is ${1/0}`;
-        var foobar = "This is ${1/0}";
-        var foobaz = 'This is ${1/0}';
-        var barfoo = "This is ${NaN}";
-        var bazfoo = "This is ${null}";
-        var bazbaz = `This is ${1/0}`;
-        var barbar = `This is NaN`;
-        var barbar = "This is ${0/0}";
-        var barber = 'This is ${0/0}';
-
-        var a = `4194304`;
-        var b = `16777216`; // Potential for further concatentation
-        var c = `${4**14}`; // Not worth converting
-    }
-}
-
-template_string_evaluate_with_many_segments: {
-    options = {
-        evaluate: true
-    }
-    beautify = {
-        quote_style: 3
-    }
-    input: {
-        var foo = `Hello ${guest()}, welcome to ${location()}${"."}`;
-        var bar = `${1}${2}${3}${4}${5}${6}${7}${8}${9}${0}`;
-        var baz = `${foobar()}${foobar()}${foobar()}${foobar()}`;
-        var buzz = `${1}${foobar()}${2}${foobar()}${3}${foobar()}`;
-    }
-    expect: {
-        var foo = `Hello ${guest()}, welcome to ${location()}.`;
-        var bar = `1234567890`;
-        var baz = `${foobar()}${foobar()}${foobar()}${foobar()}`;
-        var buzz = `1${foobar()}2${foobar()}3${foobar()}`;
-    }
-}
-
-template_string_with_many_segments: {
-    beautify = {
-        quote_style: 3
-    }
-    input: {
-        var foo = `Hello ${guest()}, welcome to ${location()}${"."}`;
-        var bar = `${1}${2}${3}${4}${5}${6}${7}${8}${9}${0}`;
-        var baz = `${foobar()}${foobar()}${foobar()}${foobar()}`;
-        var buzz = `${1}${foobar()}${2}${foobar()}${3}${foobar()}`;
-    }
-    expect: {
-        var foo = `Hello ${guest()}, welcome to ${location()}${"."}`;
-        var bar = `${1}${2}${3}${4}${5}${6}${7}${8}${9}${0}`;
-        var baz = `${foobar()}${foobar()}${foobar()}${foobar()}`;
-        var buzz = `${1}${foobar()}${2}${foobar()}${3}${foobar()}`;
-    }
-}
-
-template_string_to_normal_string: {
-    options = {
-        evaluate: true
-    }
-    beautify = {
-        quote_style: 0
-    }
-    input: {
-        var foo = `This is ${undefined}`;
-        var bar = "Decimals " + `${1}${2}${3}${4}${5}${6}${7}${8}${9}${0}`;
-    }
-    expect: {
-        var foo = `This is undefined`;
-        var bar = "Decimals 1234567890";
-    }
-}
-
-template_concattenating_string: {
-    options = {
-        evaluate: true
-    }
-    beautify = {
-        quote_style: 3 // Yes, keep quotes
-    }
-    input: {
-        var foo = "Have a nice " + `day. ${`day. ` + `day.`}`;
-        var bar = "Have a nice " + `${day()}`;
-    }
-    expect: {
-        var foo = "Have a nice day. day. day.";
-        var bar = "Have a nice " + `${day()}`;
-    }
-}
-
-evaluate_nested_templates: {
-    options = {
-        evaluate: true
-    }
-    beautify = {
-        quote_style: 0
-    }
-    input: {
-        var baz = `${`${`${`foo`}`}`}`;
-    }
-    expect: {
-        var baz = `foo`;
-    }
-}
-
-enforce_double_quotes: {
-    beautify = {
-        quote_style: 1
-    }
-    input: {
-        var foo = `Hello world`;
-        var bar = `Hello ${'world'}`;
-        var baz = `Hello ${world()}`;
-    }
-    expect: {
-        var foo = `Hello world`;
-        var bar = `Hello ${"world"}`;
-        var baz = `Hello ${world()}`;
-    }
-}
-
-enforce_single_quotes: {
-    beautify = {
-        quote_style: 2
-    }
-    input: {
-        var foo = `Hello world`;
-        var bar = `Hello ${"world"}`;
-        var baz = `Hello ${world()}`;
-    }
-    expect: {
-        var foo = `Hello world`;
-        var bar = `Hello ${'world'}`;
-        var baz = `Hello ${world()}`;
-    }
-}
-
-enforce_double_quotes_and_evaluate: {
-    beautify = {
-        quote_style: 1
-    }
-    options = {
-        evaluate: true
-    }
-    input: {
-        var foo = `Hello world`;
-        var bar = `Hello ${'world'}`;
-        var baz = `Hello ${world()}`;
-    }
-    expect: {
-        var foo = `Hello world`;
-        var bar = `Hello world`;
-        var baz = `Hello ${world()}`;
-    }
-}
-
-enforce_single_quotes_and_evaluate: {
-    beautify = {
-        quote_style: 2
-    }
-    options = {
-        evaluate: true
-    }
-    input: {
-        var foo = `Hello world`;
-        var bar = `Hello ${"world"}`;
-        var baz = `Hello ${world()}`;
-    }
-    expect: {
-        var foo = `Hello world`;
-        var bar = `Hello world`;
-        var baz = `Hello ${world()}`;
-    }
-}
-
-respect_inline_script: {
-    beautify = {
-        inline_script: true,
-        quote_style: 3
-    }
-    input: {
-        var foo = `</script>${content}`;
-        var bar = `<!--`;
-        var baz = `-->`;
-    }
-    expect_exact: "var foo=`<\\/script>${content}`;var bar=`\\x3c!--`;var baz=`--\\x3e`;";
-}
-
-do_not_optimize_tagged_template_1: {
-    beautify = {
-        quote_style: 0
-    }
-    options = {
-        evaluate: true
-    }
-    input: {
-        var foo = tag`Shall not be optimized. ${"But " + "this " + "is " + "fine."}`;
-        var bar = tag`Don't even mind changing my quotes!`;
-    }
-    expect_exact:
-        'var foo=tag`Shall not be optimized. ${"But this is fine."}`;var bar=tag`Don\'t even mind changing my quotes!`;';
-}
-
-do_not_optimize_tagged_template_2: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        var foo = tag`test` + " something out";
-    }
-    expect_exact: 'var foo=tag`test`+" something out";';
-}
-
-keep_raw_content_in_tagged_template: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        var foo = tag`\u0020\u{20}\u{00020}\x20\40\040 `;
-    }
-    expect_exact: "var foo=tag`\\u0020\\u{20}\\u{00020}\\x20\\40\\040 `;";
-}
-
-allow_chained_templates: {
-    input: {
-        var foo = tag`a``b``c``d`;
-    }
-    expect: {
-        var foo = tag`a``b``c``d`;
-    }
-}
-
-check_escaped_chars: {
-    input: {
-        var foo = `\u0020\u{20}\u{00020}\x20\40\040 `;
-    }
-    expect_exact: "var foo=`       `;";
-}
-
-escape_dollar_curly: {
-    options = {
-        evaluate: true
-    }
-    input: {
-        console.log(`\$\{ beep \}`)
-        console.log(`${1-0}\${2-0}$\{3-0}${4-0}`)
-        console.log(`$${""}{not an expression}`)
-    }
-    expect_exact: "console.log(`\\${ beep }`);console.log(`1\\${2-0}\\${3-0}4`);console.log(`\\${not an expression}`);"
-}
-
-template_starting_with_newline: {
-    options = {
-        dead_code: true
-    }
-    input: {
-        function foo(e) {
-            return `
-this is a template string!`;
-        };
-    }
-    expect_exact: "function foo(e){return`\\nthis is a template string!`}"
-}
-
-template_with_newline: {
-    options = {
-        dead_code: true
-    }
-    input: {
-        function foo(e) {
-            return `yep,
-this is a template string!`;
-        };
-    }
-    expect_exact: "function foo(e){return`yep,\\nthis is a template string!`}"
-}
-
-template_ending_with_newline: {
-    options = {
-        dead_code: true
-    }
-    input: {
-        function foo(e) {
-            return `this is a template string!
-`;
-        };
-    }
-    expect_exact: "function foo(e){return`this is a template string!\\n`}"
-}
-
-issue_1856: {
-    beautify = {
-        ascii_only: false,
-    }
-    input: {
-        console.log(`\\n\\r\\u2028\\u2029\n\r\u2028\u2029`);
-    }
-    expect_exact: "console.log(`\\\\n\\\\r\\\\u2028\\\\u2029\\n\\r\\u2028\\u2029`);"
-}
-
-issue_1856_ascii_only: {
-    beautify = {
-        ascii_only: true,
-    }
-    input: {
-        console.log(`\\n\\r\\u2028\\u2029\n\r\u2028\u2029`);
-    }
-    expect_exact: "console.log(`\\\\n\\\\r\\\\u2028\\\\u2029\\n\\r\\u2028\\u2029`);"
-}

test/compress/transform.js

@@ -45,9 +45,9 @@ condition_evaluate: {
         if (void 0 == null);
     }
     expect: {
-        while (!1);
-        for (; !0;);
-        if (!0);
+        while (0);
+        for (; 1;);
+        if (1);
     }
 }
 
@@ -68,6 +68,7 @@ label_if_break: {
         conditionals: true,
         dead_code: true,
         evaluate: true,
+        side_effects: true,
     }
     input: {
         L: if (true) {

test/compress/try-catch.js

@@ -1,12 +0,0 @@
-catch_destructuring_with_sequence: {
-    beautify = {
-        ecma: 6
-    }
-    input: {
-        try {
-            throw {};
-        } catch ({xCover = (0, function() {})} ) {
-        }
-    }
-    expect_exact: "try{throw{}}catch({xCover=(0,function(){})}){}"
-}

test/compress/typeof.js

@@ -1,6 +1,7 @@
 typeof_evaluation: {
     options = {
-        evaluate: true
+        evaluate: true,
+        typeofs: true,
     };
     input: {
         a = typeof 1;
@@ -44,7 +45,7 @@ typeof_in_boolean_context: {
         function f2() { return g(), "Yes"; }
         foo();
         console.log(1);
-        var a = !(console.log(2), !0);
+        var a = !(console.log(2), 1);
         foo();
     }
 }
@@ -57,6 +58,246 @@ issue_1668: {
         if (typeof bar);
     }
     expect: {
-        if (!0);
+        if (1);
     }
 }
+
+typeof_defun_1: {
+    options = {
+        evaluate: true,
+        inline: true,
+        passes: 2,
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        typeofs: true,
+        unused: true,
+    }
+    input: {
+        function f() {
+            console.log("YES");
+        }
+        function g() {
+            h = 42;
+            console.log("NOPE");
+        }
+        function h() {
+            console.log("YUP");
+        }
+        g = 42;
+        "function" == typeof f && f();
+        "function" == typeof g && g();
+        "function" == typeof h && h();
+    }
+    expect: {
+        function g() {
+            h = 42;
+            console.log("NOPE");
+        }
+        function h() {
+            console.log("YUP");
+        }
+        g = 42;
+        console.log("YES");
+        "function" == typeof g && g();
+        "function" == typeof h && h();
+    }
+    expect_stdout: [
+        "YES",
+        "YUP",
+    ]
+}
+
+typeof_defun_2: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        toplevel: true,
+        typeofs: true,
+    }
+    input: {
+        var f = function() {
+            console.log(x);
+        };
+        var x = 0;
+        x++ < 2 && typeof f == "function" && f();
+        x++ < 2 && typeof f == "function" && f();
+        x++ < 2 && typeof f == "function" && f();
+    }
+    expect: {
+        var f = function() {
+            console.log(x);
+        };
+        var x = 0;
+        x++ < 2 && f();
+        x++ < 2 && f();
+        x++ < 2 && f();
+    }
+    expect_stdout: [
+        "1",
+        "2",
+    ]
+}
+
+duplicate_defun_arg_name: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        typeofs: true,
+    }
+    input: {
+        function long_name(long_name) {
+            return typeof long_name;
+        }
+        console.log(typeof long_name, long_name());
+    }
+    expect: {
+        function long_name(long_name) {
+            return typeof long_name;
+        }
+        console.log(typeof long_name, long_name());
+    }
+    expect_stdout: "function undefined"
+}
+
+duplicate_lambda_arg_name: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        typeofs: true,
+    }
+    input: {
+        console.log(function long_name(long_name) {
+            return typeof long_name;
+        }());
+    }
+    expect: {
+        console.log(function long_name(long_name) {
+            return typeof long_name;
+        }());
+    }
+    expect_stdout: "undefined"
+}
+
+issue_2728_1: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        typeofs: true,
+    }
+    input: {
+        (function arguments() {
+            console.log(typeof arguments);
+        })();
+    }
+    expect: {
+        (function arguments() {
+            console.log(typeof arguments);
+        })();
+    }
+    expect_stdout: "object"
+}
+
+issue_2728_2: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        typeofs: true,
+    }
+    input: {
+        function arguments() {
+            return typeof arguments;
+        }
+        console.log(typeof arguments, arguments());
+    }
+    expect: {
+        function arguments() {
+            return typeof arguments;
+        }
+        console.log(typeof arguments, arguments());
+    }
+    expect_stdout: "function object"
+}
+
+issue_2728_3: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        typeofs: true,
+    }
+    input: {
+        (function() {
+            function arguments() {
+            }
+            console.log(typeof arguments);
+        })();
+    }
+    expect: {
+        (function() {
+            function arguments() {
+            }
+            console.log("function");
+        })();
+    }
+    expect_stdout: "function"
+}
+
+issue_2728_4: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        toplevel: true,
+        typeofs: true,
+    }
+    input: {
+        function arguments() {
+        }
+        console.log(typeof arguments);
+    }
+    expect: {
+        function arguments() {
+        }
+        console.log("function");
+    }
+    expect_stdout: "function"
+}
+
+issue_2728_5: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        typeofs: true,
+    }
+    input: {
+        (function arguments(arguments) {
+            console.log(typeof arguments);
+        })();
+    }
+    expect: {
+        (function arguments(arguments) {
+            console.log(typeof arguments);
+        })();
+    }
+    expect_stdout: "undefined"
+}
+
+issue_2728_6: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        typeofs: true,
+    }
+    input: {
+        function arguments(arguments) {
+            return typeof arguments;
+        }
+        console.log(typeof arguments, arguments());
+    }
+    expect: {
+        function arguments(arguments) {
+            return typeof arguments;
+        }
+        console.log(typeof arguments, arguments());
+    }
+    expect_stdout: "function undefined"
+}