v3.12.7

fixes #4614

.github/ISSUE_TEMPLATE.md

@@ -1,25 +0,0 @@
-**Bug report or feature request?**
-
-<!-- Note: sub-optimal but correct code is not a bug -->
-
-**Uglify version (`uglifyjs -V`)**
-
-**JavaScript input**
-
-<!--
-    A complete parsable JS program exhibiting the issue with
-    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.**
-
-**JavaScript output or error produced.**
-
-<!--
-    Note: `uglify-js` only supports JavaScript.
-    Those wishing to minify ES6+ should transpile first.
--->

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,51 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!-- Note: sub-optimal but correct code is not a bug -->
+
+**Uglify version (`uglifyjs -V`)**
+
+**JavaScript input**
+
+<!--
+A complete parsable JS program exhibiting the issue with UglifyJS alone
+- without third party tools or libraries.
+
+Ideally the input should be as small as possible, but may be large if isolating
+the problem proves to be difficult. The most important thing is that the
+standalone program reliably exhibits the bug when minified. Provide a link to a
+gist if necessary.
+
+Solely providing minified output without the original uglify JS input is not
+useful in determining the cause of the problem. Issues without a reproducible
+test case will be closed.
+-->
+
+**The `uglifyjs` CLI command executed or `minify()` options used.**
+
+<!--
+Command-line or API call to UglifyJS without third party tools or libraries.
+
+For users using bundlers or transpilers, you may be able to gather the required
+information through setting the `UGLIFY_BUG_REPORT` environment variable:
+
+    export UGLIFY_BUG_REPORT=1      (bash)
+    set UGLIFY_BUG_REPORT=1         (Command Prompt)
+    $Env:UGLIFY_BUG_REPORT=1        (PowerShell)
+
+before running your usual build process. The resulting "minified" output should
+contain the necessary details for this report.
+-->
+
+**JavaScript output or error produced.**
+
+<!--
+Only minified code that produces different output (or error) from the original
+upon execution would be considered a bug.
+-->

.github/workflows/ci.yml

@@ -7,13 +7,13 @@ jobs:
   test:
     strategy:
       matrix:
-        node: [ "0.8", "0.10", "0.12", "4", "6", "8", "10", "12", latest ]
+        node: [ '0.8', '0.10', '0.12', '4', '6', '8', '10', '12', latest ]
         os: [ ubuntu-latest, windows-latest ]
         script: [ compress, mocha, release/benchmark, release/jetstream ]
         exclude:
-          - node: "0.8"
+          - node: '0.8'
             script: release/benchmark
-          - node: "0.8"
+          - node: '0.8'
             script: release/jetstream
     name: ${{ matrix.node }} ${{ matrix.os }} ${{ matrix.script }}
     runs-on: ${{ matrix.os }}
@@ -29,7 +29,7 @@ jobs:
       - name: Perform tests
         shell: bash
         run: |
-          git clone --branch v1.5.4 --depth 1 https://github.com/jasongin/nvs.git ~/.nvs
+          git clone --branch v1.6.0 --depth 1 https://github.com/jasongin/nvs.git ~/.nvs
           while ! timeout 60 bash -c '. ~/.nvs/nvs.sh add $NODE && nvs use $NODE'; do
             cd ~/.nvs
             while !(git clean -xdf); do echo "'git clean' failed - retrying..."; done

.github/workflows/ufuzz.yml

@@ -2,7 +2,7 @@ name: Fuzzing
 on:
   pull_request:
   schedule:
-    - cron: "*/5 * * * *"
+    - cron: '*/5 * * * *'
 env:
   BASE_URL: https://api.github.com/repos/${{ github.repository }}
   CAUSE: ${{ github.event_name }}
@@ -13,22 +13,41 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ ubuntu-latest, windows-latest ]
-    name: ${{ matrix.os }}
+        include:
+          - node: latest
+            os: macos-latest
+          - node: '8'
+            os: ubuntu-latest
+          - node: '8'
+            os: ubuntu-latest
+          - node: '8'
+            os: windows-latest
+          - node: '8'
+            os: windows-latest
+    name: ${{ matrix.node }} ${{ matrix.os }}
     runs-on: ${{ matrix.os }}
+    env:
+      NODE: ${{ matrix.node }}
     steps:
       - uses: actions/checkout@v2
+      - name: Install GNU Core Utilities
+        if: ${{ startsWith(matrix.os, 'macos') }}
+        env:
+          HOMEBREW_NO_INSTALL_CLEANUP: 1
+        shell: bash
+        run: |
+          brew install coreutils
       - name: Perform fuzzing
         shell: bash
         run: |
-          git clone --branch v1.5.4 --depth 1 https://github.com/jasongin/nvs.git ~/.nvs
-          while ! timeout 60 bash -c '. ~/.nvs/nvs.sh add 8 && nvs use 8'; do
+          git clone --branch v1.6.0 --depth 1 https://github.com/jasongin/nvs.git ~/.nvs
+          while ! timeout 60 bash -c '. ~/.nvs/nvs.sh add $NODE && nvs use $NODE'; do
             cd ~/.nvs
             while !(git clean -xdf); do echo "'git clean' failed - retrying..."; done
             cd -
           done
           . ~/.nvs/nvs.sh --version
-          nvs use 8
+          nvs use $NODE
           node --version
           npm config set audit false
           npm config set optional false

README.md

@@ -135,6 +135,10 @@ a double dash to prevent input files being used as option arguments:
                                        `//# sourceMappingURL`.
     --timings                   Display operations run time on STDERR.
     --toplevel                  Compress and/or mangle variables in top level scope.
+    --v8                        Support non-standard Chrome & Node.js
+                                Equivalent to setting `v8: true` in `minify()`
+                                for `mangle` and `output` options.
+                                By default UglifyJS will not try to be v8-proof.
     --verbose                   Print diagnostic messages.
     --warn                      Print warning messages.
     --webkit                    Support non-standard Safari/Webkit.
@@ -522,6 +526,8 @@ if (result.error) throw result.error;
 - `toplevel` (default `false`) -- set to `true` if you wish to enable top level
   variable and function name mangling and to drop unused variables and functions.
 
+- `v8` (default `false`) -- enable workarounds for Chrome & Node.js bugs.
+
 - `warnings` (default `false`) — pass `true` to return compressor warnings
   in `result.warnings`. Use the value `"verbose"` for more detailed warnings.
 
@@ -621,7 +627,11 @@ to be `false` and all symbol names will be omitted.
 - `arguments` (default: `true`) -- replace `arguments[index]` with function
   parameter name whenever possible.
 
-- `assignments` (default: `true`) -- apply optimizations to assignment expressions.
+- `arrows` (default: `true`) -- apply optimizations to arrow functions
+
+- `assignments` (default: `true`) -- apply optimizations to assignment expressions
+
+- `awaits` (default: `true`) -- apply optimizations to `await` expressions
 
 - `booleans` (default: `true`) -- various optimizations for boolean context,
   for example `!!a ? b : c → a ? b : c`
@@ -638,6 +648,8 @@ to be `false` and all symbol names will be omitted.
 
 - `dead_code` (default: `true`) -- remove unreachable code
 
+- `default_values` (default: `true`) -- drop overshadowed default values
+
 - `directives` (default: `true`) -- remove redundant or non-standard directives
 
 - `drop_console` (default: `false`) -- Pass `true` to discard calls to
@@ -683,13 +695,9 @@ to be `false` and all symbol names will be omitted.
 
 - `join_vars` (default: `true`) -- join consecutive `var` statements
 
-- `keep_fargs` (default: `strict`) -- Discard unused function arguments. Code
-  which relies on `Function.length` will break if this is done indiscriminately,
-  i.e. when passing `true`. Pass `false` to always retain function arguments.
-
-- `keep_fnames` (default: `false`) -- Pass `true` to prevent the
-  compressor from discarding function names.  Useful for code relying on
-  `Function.prototype.name`. See also: the `keep_fnames` [mangle option](#mangle-options).
+- `keep_fargs` (default: `false`) -- discard unused function arguments except
+  when unsafe to do so, e.g. code which relies on `Function.prototype.length`.
+  Pass `true` to always retain function arguments.
 
 - `keep_infinity` (default: `false`) -- Pass `true` to prevent `Infinity` from
   being compressed into `1/0`, which may cause performance issues on Chrome.
@@ -739,6 +747,8 @@ to be `false` and all symbol names will be omitted.
 - `reduce_vars` (default: `true`) -- Improve optimization on variables assigned with and
   used as constant values.
 
+- `rests` (default: `true`) -- apply optimizations to rest parameters
+
 - `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
@@ -753,20 +763,23 @@ to be `false` and all symbol names will be omitted.
   annotation `/*@__PURE__*/` or `/*#__PURE__*/` immediately precedes the call. For
   example: `/*@__PURE__*/foo();`
 
-- `spread` (default: `true`) -- flatten spread expressions.
+- `spreads` (default: `true`) -- flatten spread expressions.
 
 - `strings` (default: `true`) -- compact string concatenations.
 
 - `switches` (default: `true`) -- de-duplicate and remove unreachable `switch` branches
 
-- `toplevel` (default: `false`) -- drop unreferenced functions (`"funcs"`) and/or
-  variables (`"vars"`) in the top level scope (`false` by default, `true` to drop
-  both unreferenced functions and variables)
+- `templates` (default: `true`) -- compact template literals by embedding expressions
+  and/or converting to string literals, e.g. `` `foo ${42}` → "foo 42"``
 
 - `top_retain` (default: `null`) -- prevent specific toplevel functions and
   variables from `unused` removal (can be array, comma-separated, RegExp or
   function. Implies `toplevel`)
 
+- `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)
+
 - `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.
@@ -803,10 +816,6 @@ to be `false` and all symbol names will be omitted.
 - `eval` (default `false`) -- Pass `true` to mangle names visible in scopes
   where `eval` or `with` are used.
 
-- `keep_fnames` (default `false`) -- Pass `true` to not mangle function names.
-  Useful for code relying on `Function.prototype.name`. See also: the `keep_fnames`
-  [compress option](#compress-options).
-
 - `reserved` (default `[]`) -- Pass an array of identifiers that should be
   excluded from mangling. Example: `["foo", "bar"]`.
 
@@ -873,7 +882,7 @@ can pass additional arguments that control the code output:
   comments, `"some"` to preserve multi-line comments that contain `@cc_on`,
   `@license`, or `@preserve` (case-insensitive), a regular expression string
   (e.g. `/^!/`), or a function which returns `boolean`, e.g.
-  ```js
+  ```javascript
   function(node, comment) {
       return comment.value.indexOf("@type " + node.TYPE) >= 0;
   }
@@ -919,8 +928,6 @@ can pass additional arguments that control the code output:
 
 - `shebang` (default `true`) -- preserve shebang `#!` in preamble (bash scripts)
 
-- `v8` (default `false`) -- enable workarounds for Chrome & Node.js bugs
-
 - `width` (default `80`) -- only takes effect when beautification is on, this
   specifies an (orientative) line width that the beautifier will try to
   obey.  It refers to the width of the line text (excluding indentation).
@@ -1146,7 +1153,7 @@ To enable fast minify mode from the CLI use:
 uglifyjs file.js -m
 ```
 To enable fast minify mode with the API use:
-```js
+```javascript
 UglifyJS.minify(code, { compress: false, mangle: true });
 ```
 
@@ -1178,10 +1185,10 @@ To allow for better optimizations, the compiler makes various assumptions:
   `Object.defineProperty()`, `Object.defineProperties()`, `Object.freeze()`,
   `Object.preventExtensions()` or `Object.seal()`).
 - Earlier versions of JavaScript will throw `SyntaxError` with the following:
-  ```js
+  ```javascript
   ({
-    p: 42,
-    get p() {},
+      p: 42,
+      get p() {},
   });
   // SyntaxError: Object literal may not have data and accessor property with
   //              the same name
@@ -1191,7 +1198,7 @@ To allow for better optimizations, the compiler makes various assumptions:
   versions of Chrome and Node.js may be altered.
 - When `toplevel` is enabled, UglifyJS effectively assumes input code is wrapped
   within `function(){ ... }`, thus forbids aliasing of declared global variables:
-  ```js
+  ```javascript
   A = "FAIL";
   var B = "FAIL";
   // can be `global`, `self`, `window` etc.
@@ -1209,3 +1216,57 @@ To allow for better optimizations, the compiler makes various assumptions:
   `function({}, arguments) {}` will result in `SyntaxError` in earlier versions
   of Chrome and Node.js - UglifyJS may modify the input which in turn may
   suppress those errors.
+- Earlier versions of Chrome and Node.js will throw `ReferenceError` with the
+  following:
+  ```javascript
+  var a;
+  try {
+      throw 42;
+  } catch ({
+      [a]: b,
+      // ReferenceError: a is not defined
+  }) {
+      let a;
+  }
+  ```
+  UglifyJS may modify the input which in turn may suppress those errors.
+- Later versions of JavaScript will throw `SyntaxError` with the following:
+  ```javascript
+  a => {
+      let a;
+  };
+  // SyntaxError: Identifier 'a' has already been declared
+  ```
+  UglifyJS may modify the input which in turn may suppress those errors.
+- Later versions of JavaScript will throw `SyntaxError` with the following:
+  ```javascript
+  try {
+      // ...
+  } catch ({ message: a }) {
+      var a;
+  }
+  // SyntaxError: Identifier 'a' has already been declared
+  ```
+  UglifyJS may modify the input which in turn may suppress those errors.
+- Some versions of Chrome and Node.js will throw `ReferenceError` with the
+  following:
+  ```javascript
+  console.log(((a, b = function() {
+      return a;
+      // ReferenceError: a is not defined
+  }()) => b)());
+  ```
+  UglifyJS may modify the input which in turn may suppress those errors.
+- Some arithmetic operations with `BigInt` may throw `TypeError`:
+  ```javascript
+  1n + 1;
+  // TypeError: can't convert BigInt to number
+  ```
+  UglifyJS may modify the input which in turn may suppress those errors.
+- Some versions of JavaScript will throw `SyntaxError` with the
+  following:
+  ```javascript
+  console.log(String.raw`\uFo`);
+  // SyntaxError: Invalid Unicode escape sequence
+  ```
+  UglifyJS may modify the input which in turn may suppress those errors.

bin/uglifyjs

@@ -3,7 +3,7 @@
 
 "use strict";
 
-require("../tools/exit");
+require("../tools/tty");
 
 var fs = require("fs");
 var info = require("../package.json");
@@ -265,7 +265,7 @@ if (paths.length) {
     process.stdin.on("data", function(chunk) {
         chunks.push(chunk);
     }).on("end", function() {
-        files = [ chunks.join("") ];
+        files = { STDIN: chunks.join("") };
         run();
     });
     process.stdin.resume();

lib/ast.js

@@ -160,6 +160,8 @@ var restore_transforms = [];
 AST_Node.enable_validation = function() {
     AST_Node.disable_validation();
     (function validate_transform(ctor) {
+        ctor.SUBCLASSES.forEach(validate_transform);
+        if (!HOP(ctor.prototype, "transform")) return;
         var transform = ctor.prototype.transform;
         ctor.prototype.transform = function(tw, in_list) {
             var node = transform.call(this, tw, in_list);
@@ -173,7 +175,6 @@ AST_Node.enable_validation = function() {
         restore_transforms.push(function() {
             ctor.prototype.transform = transform;
         });
-        ctor.SUBCLASSES.forEach(validate_transform);
     })(this);
 };
 
@@ -207,13 +208,23 @@ var AST_EmptyStatement = DEFNODE("EmptyStatement", null, {
     $documentation: "The empty statement (empty block or simply a semicolon)"
 }, AST_Statement);
 
-function must_be_expression(node, prop) {
-    if (!(node[prop] instanceof AST_Node)) throw new Error(prop + " must be AST_Node");
-    if (node[prop] instanceof AST_Hole) throw new Error(prop + " cannot be AST_Hole");
-    if (node[prop] instanceof AST_Spread) throw new Error(prop + " cannot be AST_Spread");
-    if (node[prop] instanceof AST_Statement && !is_function(node[prop])) {
-        throw new Error(prop + " cannot be AST_Statement");
+function validate_expression(value, prop, multiple, allow_spread, allow_hole) {
+    multiple = multiple ? "contain" : "be";
+    if (!(value instanceof AST_Node)) throw new Error(prop + " must " + multiple + " AST_Node");
+    if (value instanceof AST_DefaultValue) throw new Error(prop + " cannot " + multiple + " AST_DefaultValue");
+    if (value instanceof AST_Destructured) throw new Error(prop + " cannot " + multiple + " AST_Destructured");
+    if (value instanceof AST_Hole && !allow_hole) throw new Error(prop + " cannot " + multiple + " AST_Hole");
+    if (value instanceof AST_Spread && !allow_spread) throw new Error(prop + " cannot " + multiple + " AST_Spread");
+    if (value instanceof AST_Statement && !is_function(value)) {
+        throw new Error(prop + " cannot " + multiple + " AST_Statement");
     }
+    if (value instanceof AST_SymbolDeclaration) {
+        throw new Error(prop + " cannot " + multiple + " AST_SymbolDeclaration");
+    }
+}
+
+function must_be_expression(node, prop) {
+    validate_expression(node[prop], prop);
 }
 
 var AST_SimpleStatement = DEFNODE("SimpleStatement", "body", {
@@ -238,7 +249,7 @@ var AST_BlockScope = DEFNODE("BlockScope", "enclosed functions make_def parent_s
         enclosed: "[SymbolDef*/S] a list of all symbol definitions that are accessed from this scope or any subscopes",
         functions: "[Object/S] like `variables`, but only lists function declarations",
         parent_scope: "[AST_Scope?/S] link to the parent scope",
-        variables: "[Object/S] a map of name -> SymbolDef for all variables/functions defined in this scope",
+        variables: "[Object/S] a map of name ---> SymbolDef for all variables/functions defined in this scope",
     },
     clone: function(deep) {
         var node = this._clone(deep);
@@ -461,7 +472,7 @@ var AST_Scope = DEFNODE("Scope", "uses_eval uses_with", {
 var AST_Toplevel = DEFNODE("Toplevel", "globals", {
     $documentation: "The toplevel scope",
     $propdoc: {
-        globals: "[Object/S] a map of name -> SymbolDef for all undeclared names",
+        globals: "[Object/S] a map of name ---> SymbolDef for all undeclared names",
     },
     wrap: function(name) {
         var body = this.body;
@@ -502,15 +513,19 @@ var AST_Toplevel = DEFNODE("Toplevel", "globals", {
     }
 }, AST_Scope);
 
-var AST_Lambda = DEFNODE("Lambda", "name argnames length_read uses_arguments", {
+var AST_Lambda = DEFNODE("Lambda", "argnames length_read rest uses_arguments", {
     $documentation: "Base class for functions",
     $propdoc: {
-        name: "[AST_SymbolDeclaration?] the name of this function",
-        argnames: "[(AST_Destructured|AST_SymbolFunarg)*] array of function arguments and/or destructured literals",
+        argnames: "[(AST_DefaultValue|AST_Destructured|AST_SymbolFunarg)*] array of function arguments and/or destructured literals",
+        rest: "[(AST_Destructured|AST_SymbolFunarg)?] rest parameter, or null if absent",
         uses_arguments: "[boolean/S] tells whether this function accesses the arguments array",
     },
     each_argname: function(visit) {
         var tw = new TreeWalker(function(node) {
+            if (node instanceof AST_DefaultValue) {
+                node.name.walk(tw);
+                return true;
+            }
             if (node instanceof AST_DestructuredKeyVal) {
                 node.value.walk(tw);
                 return true;
@@ -520,6 +535,7 @@ var AST_Lambda = DEFNODE("Lambda", "name argnames length_read uses_arguments", {
         this.argnames.forEach(function(argname) {
             argname.walk(tw);
         });
+        if (this.rest) this.rest.walk(tw);
     },
     walk: function(visitor) {
         var node = this;
@@ -528,6 +544,7 @@ var AST_Lambda = DEFNODE("Lambda", "name argnames length_read uses_arguments", {
             node.argnames.forEach(function(argname) {
                 argname.walk(visitor);
             });
+            if (node.rest) node.rest.walk(visitor);
             walk_body(node, visitor);
         });
     },
@@ -535,24 +552,104 @@ var AST_Lambda = DEFNODE("Lambda", "name argnames length_read uses_arguments", {
         this.argnames.forEach(function(node) {
             validate_destructured(node, function(node) {
                 if (!(node instanceof AST_SymbolFunarg)) throw new Error("argnames must be AST_SymbolFunarg[]");
-            });
+            }, true);
+        });
+        if (this.rest != null) validate_destructured(this.rest, function(node) {
+            if (!(node instanceof AST_SymbolFunarg)) throw new Error("rest must be AST_SymbolFunarg");
         });
     },
 }, AST_Scope);
 
 var AST_Accessor = DEFNODE("Accessor", null, {
-    $documentation: "A setter/getter function.  The `name` property is always null.",
+    $documentation: "A getter/setter function",
     _validate: function() {
         if (this.name != null) throw new Error("name must be null");
     },
 }, AST_Lambda);
 
-function is_function(node) {
-    return node instanceof AST_AsyncFunction || node instanceof AST_Function;
+function is_arrow(node) {
+    return node instanceof AST_AsyncArrow || node instanceof AST_Arrow;
 }
 
-var AST_AsyncFunction = DEFNODE("AsyncFunction", "inlined", {
+function is_function(node) {
+    return is_arrow(node) || node instanceof AST_AsyncFunction || node instanceof AST_Function;
+}
+
+function walk_lambda(node, tw) {
+    if (is_arrow(node) && node.value) {
+        node.value.walk(tw);
+    } else {
+        walk_body(node, tw);
+    }
+}
+
+var AST_Arrow = DEFNODE("Arrow", "inlined value", {
+    $documentation: "An arrow function expression",
+    $propdoc: {
+        value: "[AST_Node?] simple return expression, or null if using function body.",
+    },
+    walk: function(visitor) {
+        var node = this;
+        visitor.visit(node, function() {
+            node.argnames.forEach(function(argname) {
+                argname.walk(visitor);
+            });
+            if (node.rest) node.rest.walk(visitor);
+            if (node.value) {
+                node.value.walk(visitor);
+            } else {
+                walk_body(node, visitor);
+            }
+        });
+    },
+    _validate: function() {
+        if (this.name != null) throw new Error("name must be null");
+        if (this.uses_arguments) throw new Error("uses_arguments must be false");
+        if (this.value != null) {
+            must_be_expression(this, "value");
+            if (this.body.length) throw new Error("body must be empty if value exists");
+        }
+    },
+}, AST_Lambda);
+
+function is_async(node) {
+    return node instanceof AST_AsyncArrow || node instanceof AST_AsyncDefun || node instanceof AST_AsyncFunction;
+}
+
+var AST_AsyncArrow = DEFNODE("AsyncArrow", "inlined value", {
+    $documentation: "An asynchronous arrow function expression",
+    $propdoc: {
+        value: "[AST_Node?] simple return expression, or null if using function body.",
+    },
+    walk: function(visitor) {
+        var node = this;
+        visitor.visit(node, function() {
+            node.argnames.forEach(function(argname) {
+                argname.walk(visitor);
+            });
+            if (node.rest) node.rest.walk(visitor);
+            if (node.value) {
+                node.value.walk(visitor);
+            } else {
+                walk_body(node, visitor);
+            }
+        });
+    },
+    _validate: function() {
+        if (this.name != null) throw new Error("name must be null");
+        if (this.uses_arguments) throw new Error("uses_arguments must be false");
+        if (this.value != null) {
+            must_be_expression(this, "value");
+            if (this.body.length) throw new Error("body must be empty if value exists");
+        }
+    },
+}, AST_Lambda);
+
+var AST_AsyncFunction = DEFNODE("AsyncFunction", "inlined name", {
     $documentation: "An asynchronous function expression",
+    $propdoc: {
+        name: "[AST_SymbolLambda?] the name of this function",
+    },
     _validate: function() {
         if (this.name != null) {
             if (!(this.name instanceof AST_SymbolLambda)) throw new Error("name must be AST_SymbolLambda");
@@ -560,8 +657,11 @@ var AST_AsyncFunction = DEFNODE("AsyncFunction", "inlined", {
     },
 }, AST_Lambda);
 
-var AST_Function = DEFNODE("Function", "inlined", {
+var AST_Function = DEFNODE("Function", "inlined name", {
     $documentation: "A function expression",
+    $propdoc: {
+        name: "[AST_SymbolLambda?] the name of this function",
+    },
     _validate: function() {
         if (this.name != null) {
             if (!(this.name instanceof AST_SymbolLambda)) throw new Error("name must be AST_SymbolLambda");
@@ -573,15 +673,21 @@ function is_defun(node) {
     return node instanceof AST_AsyncDefun || node instanceof AST_Defun;
 }
 
-var AST_AsyncDefun = DEFNODE("AsyncDefun", "inlined", {
+var AST_AsyncDefun = DEFNODE("AsyncDefun", "inlined name", {
     $documentation: "An asynchronous function definition",
+    $propdoc: {
+        name: "[AST_SymbolDefun] the name of this function",
+    },
     _validate: function() {
         if (!(this.name instanceof AST_SymbolDefun)) throw new Error("name must be AST_SymbolDefun");
     },
 }, AST_Lambda);
 
-var AST_Defun = DEFNODE("Defun", "inlined", {
+var AST_Defun = DEFNODE("Defun", "inlined name", {
     $documentation: "A function definition",
+    $propdoc: {
+        name: "[AST_SymbolDefun] the name of this function",
+    },
     _validate: function() {
         if (!(this.name instanceof AST_SymbolDefun)) throw new Error("name must be AST_SymbolDefun");
     },
@@ -747,7 +853,7 @@ 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?] symbol for the exception, or null if not present",
+        argname: "[(AST_Destructured|AST_SymbolCatch)?] symbol for the exception, or null if not present",
     },
     walk: function(visitor) {
         var node = this;
@@ -757,9 +863,9 @@ var AST_Catch = DEFNODE("Catch", "argname", {
         });
     },
     _validate: function() {
-        if (this.argname != null) {
-            if (!(this.argname instanceof AST_SymbolCatch)) throw new Error("argname must be AST_SymbolCatch");
-        }
+        if (this.argname != null) validate_destructured(this.argname, function(node) {
+            if (!(node instanceof AST_SymbolCatch)) throw new Error("argname must be AST_SymbolCatch");
+        });
     },
 }, AST_Block);
 
@@ -795,7 +901,6 @@ var AST_Const = DEFNODE("Const", null, {
             validate_destructured(node.name, function(node) {
                 if (!(node instanceof AST_SymbolConst)) throw new Error("name must be AST_SymbolConst");
             });
-            if (node.value != null) must_be_expression(node, "value");
         });
     },
 }, AST_Definitions);
@@ -808,7 +913,6 @@ var AST_Let = DEFNODE("Let", null, {
             validate_destructured(node.name, function(node) {
                 if (!(node instanceof AST_SymbolLet)) throw new Error("name must be AST_SymbolLet");
             });
-            if (node.value != null) must_be_expression(node, "value");
         });
     },
 }, AST_Definitions);
@@ -821,7 +925,6 @@ var AST_Var = DEFNODE("Var", null, {
             validate_destructured(node.name, function(node) {
                 if (!(node instanceof AST_SymbolVar)) throw new Error("name must be AST_SymbolVar");
             });
-            if (node.value != null) must_be_expression(node, "value");
         });
     },
 }, AST_Definitions);
@@ -829,8 +932,8 @@ var AST_Var = DEFNODE("Var", null, {
 var AST_VarDef = DEFNODE("VarDef", "name value", {
     $documentation: "A variable declaration; only appears in a AST_Definitions node",
     $propdoc: {
-        name: "[AST_SymbolVar] name of the variable",
-        value: "[AST_Node?] initializer, or null of there's no initializer"
+        name: "[AST_Destructured|AST_SymbolVar] name of the variable",
+        value: "[AST_Node?] initializer, or null of there's no initializer",
     },
     walk: function(visitor) {
         var node = this;
@@ -839,18 +942,34 @@ var AST_VarDef = DEFNODE("VarDef", "name value", {
             if (node.value) node.value.walk(visitor);
         });
     },
+    _validate: function() {
+        if (this.value != null) must_be_expression(this, "value");
+    },
 });
 
 /* -----[ OTHER ]----- */
 
+var AST_DefaultValue = DEFNODE("DefaultValue", "name value", {
+    $documentation: "A default value declaration",
+    $propdoc: {
+        name: "[AST_Destructured|AST_SymbolDeclaration] name of the variable",
+        value: "[AST_Node] value to assign if variable is `undefined`",
+    },
+    walk: function(visitor) {
+        var node = this;
+        visitor.visit(node, function() {
+            node.name.walk(visitor);
+            node.value.walk(visitor);
+        });
+    },
+    _validate: function() {
+        must_be_expression(this, "value");
+    },
+});
+
 function must_be_expressions(node, prop, allow_spread, allow_hole) {
     node[prop].forEach(function(node) {
-        if (!(node instanceof AST_Node)) throw new Error(prop + " must be AST_Node[]");
-        if (!allow_hole && node instanceof AST_Hole) throw new Error(prop + " cannot be AST_Hole");
-        if (!allow_spread && node instanceof AST_Spread) throw new Error(prop + " cannot be AST_Spread");
-        if (node instanceof AST_Statement && !is_function(node)) {
-            throw new Error(prop + " cannot contain AST_Statement");
-        }
+        validate_expression(node, prop, true, allow_spread, allow_hole);
     });
 }
 
@@ -1005,7 +1124,7 @@ var AST_Binary = DEFNODE("Binary", "operator left right", {
         });
     },
     _validate: function() {
-        must_be_expression(this, "left");
+        if (!(this instanceof AST_Assign)) must_be_expression(this, "left");
         if (typeof this.operator != "string") throw new Error("operator must be string");
         must_be_expression(this, "right");
     },
@@ -1084,24 +1203,31 @@ var AST_Array = DEFNODE("Array", "elements", {
     },
 });
 
-var AST_Destructured = DEFNODE("Destructured", null, {
+var AST_Destructured = DEFNODE("Destructured", "rest", {
     $documentation: "Base class for destructured literal",
+    $propdoc: {
+        rest: "[(AST_Destructured|AST_SymbolDeclaration|AST_SymbolRef)?] rest parameter, or null if absent",
+    },
 });
 
-function validate_destructured(node, check) {
-    if (node instanceof AST_DestructuredArray) return node.elements.forEach(function(node) {
-        if (!(node instanceof AST_Hole)) validate_destructured(node, check);
-    });
-    if (node instanceof AST_DestructuredObject) return node.properties.forEach(function(prop) {
-        validate_destructured(prop.value, check);
-    });
+function validate_destructured(node, check, allow_default) {
+    if (node instanceof AST_DefaultValue && allow_default) return validate_destructured(node.name, check);
+    if (node instanceof AST_Destructured) {
+        if (node.rest != null) validate_destructured(node.rest, check);
+        if (node instanceof AST_DestructuredArray) return node.elements.forEach(function(node) {
+            if (!(node instanceof AST_Hole)) validate_destructured(node, check, true);
+        });
+        if (node instanceof AST_DestructuredObject) return node.properties.forEach(function(prop) {
+            validate_destructured(prop.value, check, true);
+        });
+    }
     check(node);
 }
 
 var AST_DestructuredArray = DEFNODE("DestructuredArray", "elements", {
     $documentation: "A destructured array literal",
     $propdoc: {
-        elements: "[AST_Node*] array of elements",
+        elements: "[(AST_DefaultValue|AST_Destructured|AST_SymbolDeclaration|AST_SymbolRef)*] array of elements",
     },
     walk: function(visitor) {
         var node = this;
@@ -1109,6 +1235,7 @@ var AST_DestructuredArray = DEFNODE("DestructuredArray", "elements", {
             node.elements.forEach(function(element) {
                 element.walk(visitor);
             });
+            if (node.rest) node.rest.walk(visitor);
         });
     },
 }, AST_Destructured);
@@ -1117,7 +1244,7 @@ var AST_DestructuredKeyVal = DEFNODE("DestructuredKeyVal", "key value", {
     $documentation: "A key: value destructured property",
     $propdoc: {
         key: "[string|AST_Node] property name.  For computed property this is an AST_Node.",
-        value: "[AST_Node] property value",
+        value: "[AST_DefaultValue|AST_Destructured|AST_SymbolDeclaration|AST_SymbolRef] property value",
     },
     walk: function(visitor) {
         var node = this;
@@ -1131,7 +1258,7 @@ var AST_DestructuredKeyVal = DEFNODE("DestructuredKeyVal", "key value", {
             if (!(this.key instanceof AST_Node)) throw new Error("key must be string or AST_Node");
             must_be_expression(this, "key");
         }
-        must_be_expression(this, "value");
+        if (!(this.value instanceof AST_Node)) throw new Error("value must be AST_Node");
     },
 });
 
@@ -1146,6 +1273,7 @@ var AST_DestructuredObject = DEFNODE("DestructuredObject", "properties", {
             node.properties.forEach(function(prop) {
                 prop.walk(visitor);
             });
+            if (node.rest) node.rest.walk(visitor);
         });
     },
     _validate: function() {
@@ -1275,7 +1403,7 @@ var AST_Label = DEFNODE("Label", "references", {
     }
 }, AST_Symbol);
 
-var AST_SymbolRef = DEFNODE("SymbolRef", "fixed", {
+var AST_SymbolRef = DEFNODE("SymbolRef", "fixed in_arg redef", {
     $documentation: "Reference to some symbol (not definition/declaration)",
 }, AST_Symbol);
 
@@ -1290,6 +1418,34 @@ var AST_This = DEFNODE("This", null, {
     },
 }, AST_Symbol);
 
+var AST_Template = DEFNODE("Template", "expressions strings tag", {
+    $documentation: "A template literal, i.e. tag`str1${expr1}...strN${exprN}strN+1`",
+    $propdoc: {
+        expressions: "[AST_Node*] the placeholder expressions",
+        strings: "[string*] the raw text segments",
+        tag: "[AST_Node] tag function, or null if absent",
+    },
+    walk: function(visitor) {
+        var node = this;
+        visitor.visit(node, function() {
+            if (node.tag) node.tag.walk(visitor);
+            node.expressions.forEach(function(expr) {
+                expr.walk(visitor);
+            });
+        });
+    },
+    _validate: function() {
+        if (this.expressions.length + 1 != this.strings.length) {
+            throw new Error("malformed template with " + this.expressions.length + " placeholder(s) but " + this.strings.length + " text segment(s)");
+        }
+        must_be_expressions(this, "expressions");
+        this.strings.forEach(function(string) {
+            if (typeof string != "string") throw new Error("strings must contain string");
+        });
+        if (this.tag != null) must_be_expression(this, "tag");
+    },
+});
+
 var AST_Constant = DEFNODE("Constant", null, {
     $documentation: "Base class for all constants",
 });
@@ -1312,6 +1468,19 @@ var AST_Number = DEFNODE("Number", "value", {
     },
     _validate: function() {
         if (typeof this.value != "number") throw new Error("value must be number");
+        if (!isFinite(this.value)) throw new Error("value must be finite");
+        if (this.value < 0) throw new Error("value cannot be negative");
+    },
+}, AST_Constant);
+
+var AST_BigInt = DEFNODE("BigInt", "value", {
+    $documentation: "A BigInt literal",
+    $propdoc: {
+        value: "[string] the numeric representation",
+    },
+    _validate: function() {
+        if (typeof this.value != "string") throw new Error("value must be string");
+        if (this.value[0] == "-") throw new Error("value cannot be negative");
     },
 }, AST_Constant);
 

lib/minify.js

@@ -87,6 +87,7 @@ function minify(files, options) {
             sourceMap: false,
             timings: false,
             toplevel: false,
+            v8: false,
             validate: false,
             warnings: false,
             webkit: false,
@@ -102,6 +103,7 @@ function minify(files, options) {
         set_shorthand("ie8", options, [ "compress", "mangle", "output" ]);
         set_shorthand("keep_fnames", options, [ "compress", "mangle" ]);
         set_shorthand("toplevel", options, [ "compress", "mangle" ]);
+        set_shorthand("v8", options, [ "mangle", "output" ]);
         set_shorthand("webkit", options, [ "mangle", "output" ]);
         var quoted_props;
         if (options.mangle) {
@@ -113,6 +115,7 @@ function minify(files, options) {
                 properties: false,
                 reserved: [],
                 toplevel: false,
+                v8: false,
                 webkit: false,
             }, true);
             if (options.mangle.properties) {

lib/output.js

@@ -678,39 +678,47 @@ function OutputStream(options) {
     // same goes for an object literal, because otherwise it would be
     // interpreted as a block of code.
     function needs_parens_obj(output) {
-        return !output.has_parens() && first_in_statement(output);
+        return !output.has_parens() && first_in_statement(output, true);
     }
     PARENS(AST_Object, needs_parens_obj);
 
     PARENS(AST_Unary, function(output) {
         var p = output.parent();
+        // (-x) ** y
+        if (p instanceof AST_Binary) return p.operator == "**" && p.left === this;
+        // (x++).toString(3)
+        // (typeof x).length
         return (p instanceof AST_Call || p instanceof AST_PropAccess) && p.expression === this;
     });
 
     PARENS(AST_Sequence, function(output) {
         var p = output.parent();
-            // [ 1, (2, 3), 4 ] ==> [ 1, 3, 4 ]
+            // [ 1, (2, 3), 4 ] ---> [ 1, 3, 4 ]
         return p instanceof AST_Array
+            // () ---> (foo, bar)
+            || is_arrow(p) && p.value === this
             // await (foo, bar)
             || p instanceof AST_Await
-            // 1 + (2, 3) + 4 ==> 8
+            // 1 + (2, 3) + 4 ---> 8
             || p instanceof AST_Binary
             // new (foo, bar) or foo(1, (2, 3), 4)
             || p instanceof AST_Call
             // (false, true) ? (a = 10, b = 20) : (c = 30)
-            // ==> 20 (side effect, set a := 10 and b := 20)
+            // ---> 20 (side effect, set a := 10 and b := 20)
             || p instanceof AST_Conditional
-            // { [(1, 2)]: 3 }[2] ==> 3
-            // { foo: (1, 2) }.foo ==> 2
+            // [ a = (1, 2) ] = [] ---> a == 2
+            || p instanceof AST_DefaultValue
+            // { [(1, 2)]: 3 }[2] ---> 3
+            // { foo: (1, 2) }.foo ---> 2
             || p instanceof AST_DestructuredKeyVal
             || p instanceof AST_ObjectProperty
-            // (1, {foo:2}).foo or (1, {foo:2})["foo"] ==> 2
+            // (1, {foo:2}).foo or (1, {foo:2})["foo"] ---> 2
             || p instanceof AST_PropAccess && p.expression === this
             // ...(foo, bar, baz)
             || p instanceof AST_Spread
             // !(foo, bar, baz)
             || p instanceof AST_Unary
-            // var a = (1, 2), b = a + a; ==> b == 4
+            // var a = (1, 2), b = a + a; ---> b == 4
             || p instanceof AST_VarDef;
     });
 
@@ -718,11 +726,14 @@ function OutputStream(options) {
         var p = output.parent();
         // await (foo && bar)
         if (p instanceof AST_Await) return true;
-        // this deals with precedence: 3 * (2 + 1)
+        // this deals with precedence:
+        //   3 * (2 + 1)
+        //   3 - (2 - 1)
+        //   (1 ** 2) ** 3
         if (p instanceof AST_Binary) {
             var po = p.operator, pp = PRECEDENCE[po];
             var so = this.operator, sp = PRECEDENCE[so];
-            return pp > sp || (pp == sp && this === p.right);
+            return pp > sp || (pp == sp && this === p[po == "**" ? "left" : "right"]);
         }
         // (foo && bar)()
         if (p instanceof AST_Call) return p.expression === this;
@@ -769,18 +780,16 @@ function OutputStream(options) {
         // (new foo)(bar)
         if (p instanceof AST_Call) return p.expression === this;
         // (new Date).getTime(), (new Date)["getTime"]()
-        return p instanceof AST_PropAccess;
+        if (p instanceof AST_PropAccess) return true;
+        // (new foo)`bar`
+        if (p instanceof AST_Template) return p.tag === this;
     });
 
     PARENS(AST_Number, function(output) {
+        if (!output.option("galio")) return false;
+        // https://github.com/mishoo/UglifyJS/pull/1009
         var p = output.parent();
-        if (p instanceof AST_PropAccess && p.expression === this) {
-            var value = this.value;
-                // https://github.com/mishoo/UglifyJS/issues/115
-            return value < 0
-                // https://github.com/mishoo/UglifyJS/pull/1009
-                || output.option("galio") && /^0/.test(make_num(value));
-        }
+        return p instanceof AST_PropAccess && p.expression === this && /^0/.test(make_num(this.value));
     });
 
     function needs_parens_assign_cond(self, output) {
@@ -795,23 +804,33 @@ function OutputStream(options) {
         if (p instanceof AST_Conditional) return p.condition === self;
         // (a = foo)["prop"] —or— (a = foo).prop
         if (p instanceof AST_PropAccess) return p.expression === self;
+        // (a = foo)`bar`
+        if (p instanceof AST_Template) return p.tag === self;
         // !(a = false) → true
         if (p instanceof AST_Unary) return true;
     }
+    PARENS(AST_Arrow, function(output) {
+        return needs_parens_assign_cond(this, output);
+    });
     PARENS(AST_Assign, function(output) {
         if (needs_parens_assign_cond(this, output)) return true;
-        //  v8 parser bug   =>     workaround
-        // f([1], [a] = []) => f([1], ([a] = []))
+        //  v8 parser bug   --->     workaround
+        // f([1], [a] = []) ---> f([1], ([a] = []))
         if (output.option("v8")) return this.left instanceof AST_Destructured;
         // ({ p: a } = o);
         if (this.left instanceof AST_DestructuredObject) return needs_parens_obj(output);
     });
+    PARENS(AST_AsyncArrow, function(output) {
+        return needs_parens_assign_cond(this, output);
+    });
     PARENS(AST_Conditional, function(output) {
         return needs_parens_assign_cond(this, output);
     });
 
     PARENS(AST_Await, function(output) {
         var p = output.parent();
+        // (await x) ** y
+        if (p instanceof AST_Binary) return p.operator == "**" && p.left === this;
         // new (await foo)
         // (await foo)(bar)
         if (p instanceof AST_Call) return p.expression === this;
@@ -985,17 +1004,48 @@ function OutputStream(options) {
     });
 
     /* -----[ functions ]----- */
-    function print_lambda(self, output) {
-        if (self.name) {
-            output.space();
-            self.name.print(output);
-        }
+    function print_funargs(self, output) {
         output.with_parens(function() {
             self.argnames.forEach(function(arg, i) {
                 if (i) output.comma();
                 arg.print(output);
             });
+            if (self.rest) {
+                if (self.argnames.length) output.comma();
+                output.print("...");
+                self.rest.print(output);
+            }
         });
+    }
+    function print_arrow(self, output) {
+        if (self.argnames.length == 1 && self.argnames[0] instanceof AST_SymbolFunarg && !self.rest) {
+            self.argnames[0].print(output);
+        } else {
+            print_funargs(self, output);
+        }
+        output.space();
+        output.print("=>");
+        output.space();
+        if (self.value) {
+            self.value.print(output);
+        } else {
+            print_braced(self, output, true);
+        }
+    }
+    DEFPRINT(AST_Arrow, function(output) {
+        print_arrow(this, output);
+    });
+    DEFPRINT(AST_AsyncArrow, function(output) {
+        output.print("async");
+        output.space();
+        print_arrow(this, output);
+    });
+    function print_lambda(self, output) {
+        if (self.name) {
+            output.space();
+            self.name.print(output);
+        }
+        print_funargs(self, output);
         output.space();
         print_braced(self, output, true);
     }
@@ -1174,11 +1224,9 @@ function OutputStream(options) {
         // need to take some precautions here:
         //    https://github.com/mishoo/UglifyJS/issues/60
         if (noin) node.walk(new TreeWalker(function(node) {
-            if (parens || node instanceof AST_Scope) return true;
-            if (node instanceof AST_Binary && node.operator == "in") {
-                parens = true;
-                return true;
-            }
+            if (parens) return true;
+            if (node instanceof AST_Binary && node.operator == "in") return parens = true;
+            if (node instanceof AST_Scope && !(is_arrow(node) && node.value)) return true;
         }));
         node.print(output, parens);
     }
@@ -1196,6 +1244,15 @@ function OutputStream(options) {
         }
     });
 
+    DEFPRINT(AST_DefaultValue, function(output) {
+        var self = this;
+        self.name.print(output);
+        output.space();
+        output.print("=");
+        output.space();
+        self.value.print(output);
+    });
+
     /* -----[ other expressions ]----- */
     function print_call_args(self, output) {
         if (self.expression instanceof AST_Call || self.expression instanceof AST_Lambda) {
@@ -1322,25 +1379,30 @@ function OutputStream(options) {
         } : noop);
     });
     DEFPRINT(AST_DestructuredArray, function(output) {
-        var a = this.elements, len = a.length;
-        output.with_square(len > 0 ? function() {
+        var a = this.elements, len = a.length, rest = this.rest;
+        output.with_square(len || rest ? function() {
             output.space();
             a.forEach(function(exp, i) {
                 if (i) output.comma();
                 exp.print(output);
+            });
+            if (rest) {
+                if (len) output.comma();
+                output.print("...");
+                rest.print(output);
+            } else if (a[len - 1] instanceof AST_Hole) {
                 // 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 && exp instanceof AST_Hole)
-                  output.comma();
-            });
+                output.comma();
+            }
             output.space();
         } : noop);
     });
     DEFPRINT(AST_DestructuredKeyVal, print_key_value);
     DEFPRINT(AST_DestructuredObject, function(output) {
-        var props = this.properties;
-        if (props.length > 0) output.with_block(function() {
+        var props = this.properties, len = props.length, rest = this.rest;
+        if (len || rest) output.with_block(function() {
             props.forEach(function(prop, i) {
                 if (i) {
                     output.print(",");
@@ -1349,6 +1411,15 @@ function OutputStream(options) {
                 output.indent();
                 prop.print(output);
             });
+            if (rest) {
+                if (len) {
+                    output.print(",");
+                    output.newline();
+                }
+                output.indent();
+                output.print("...");
+                rest.print(output);
+            }
             output.newline();
         });
         else print_braced_empty(this, output);
@@ -1419,6 +1490,19 @@ function OutputStream(options) {
     DEFPRINT(AST_This, function(output) {
         output.print("this");
     });
+    DEFPRINT(AST_Template, function(output) {
+        var self = this;
+        if (self.tag) self.tag.print(output);
+        output.print("`");
+        for (var i = 0; i < self.expressions.length; i++) {
+            output.print(self.strings[i]);
+            output.print("${");
+            self.expressions[i].print(output);
+            output.print("}");
+        }
+        output.print(self.strings[i]);
+        output.print("`");
+    });
     DEFPRINT(AST_Constant, function(output) {
         output.print(this.value);
     });

lib/propmangle.js

@@ -228,7 +228,7 @@ function mangle_properties(ast, options) {
         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_.
+                // debug mode: use a prefix and suffix to preserve readability, e.g. o.foo ---> o._$foo$NNN_.
                 var debug_mangled = "_$" + name + "$" + debug_suffix + "_";
                 if (can_mangle(debug_mangled)) mangled = debug_mangled;
             }

lib/scope.js

@@ -48,7 +48,6 @@ function SymbolDef(id, scope, orig, init) {
     this.global = false;
     this.id = id;
     this.init = init;
-    this.lambda = orig instanceof AST_SymbolLambda;
     this.mangled_name = null;
     this.name = orig.name;
     this.orig = [ orig ];
@@ -100,6 +99,16 @@ SymbolDef.prototype = {
     },
 };
 
+var unary_side_effects = makePredicate("delete ++ --");
+
+function is_lhs(node, parent) {
+    if (parent instanceof AST_Assign) return parent.left === node && node;
+    if (parent instanceof AST_DefaultValue) return parent.name === node && node;
+    if (parent instanceof AST_Destructured) return node;
+    if (parent instanceof AST_DestructuredKeyVal) return node;
+    if (parent instanceof AST_Unary) return unary_side_effects[parent.operator] && parent.expression;
+}
+
 AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
     options = defaults(options, {
         cache: null,
@@ -118,6 +127,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
                 node.argnames.forEach(function(argname) {
                     argname.walk(tw);
                 });
+                if (node.rest) node.rest.walk(tw);
                 walk_body(node, tw);
             });
             return true;
@@ -206,32 +216,46 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
     self.globals = new Dictionary();
     var in_arg = [];
     var tw = new TreeWalker(function(node) {
+        if (node instanceof AST_Catch) {
+            if (!(node.argname instanceof AST_Destructured)) return;
+            in_arg.push(node);
+            node.argname.walk(tw);
+            in_arg.pop();
+            walk_body(node, tw);
+            return true;
+        }
         if (node instanceof AST_Lambda) {
             in_arg.push(node);
             node.argnames.forEach(function(argname) {
                 argname.walk(tw);
             });
+            if (node.rest) node.rest.walk(tw);
             in_arg.pop();
-            walk_body(node, tw);
+            walk_lambda(node, tw);
             return true;
         }
         if (node instanceof AST_LoopControl) {
             if (node.label) node.label.thedef.references.push(node);
             return true;
         }
-        // ensure mangling works if `catch` reuses a scope variable
-        if (node instanceof AST_SymbolCatch) {
-            var def = node.definition().redefined();
-            if (def) for (var s = node.scope; s; s = s.parent_scope) {
-                push_uniq(s.enclosed, def);
-                if (s === def.scope) break;
+        if (node instanceof AST_SymbolDeclaration) {
+            if (node instanceof AST_SymbolCatch) {
+                // ensure mangling works if `catch` reuses a scope variable
+                var def = node.definition().redefined();
+                if (def) for (var s = node.scope; s; s = s.parent_scope) {
+                    push_uniq(s.enclosed, def);
+                    if (s === def.scope) break;
+                }
+            } else if (node instanceof AST_SymbolConst) {
+                // ensure compression works if `const` reuses a scope variable
+                var redef = node.definition().redefined();
+                if (redef) redef.const_redefs = true;
             }
-            return true;
-        }
-        // ensure compression works if `const` reuses a scope variable
-        if (node instanceof AST_SymbolConst) {
-            var redef = node.definition().redefined();
-            if (redef) redef.const_redefs = true;
+            if (node.name != "arguments") return true;
+            var parent = node instanceof AST_SymbolVar && tw.parent();
+            if (parent instanceof AST_VarDef && !parent.value) return true;
+            var sym = node.scope.resolve().find_variable("arguments");
+            if (sym && is_arguments(sym)) sym.scope.uses_arguments = 3;
             return true;
         }
         if (node instanceof AST_SymbolRef) {
@@ -241,7 +265,9 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
                 i = in_arg.lastIndexOf(sym.scope, i - 1);
                 if (i < 0) break;
                 var decl = sym.orig[0];
-                if (decl instanceof AST_SymbolFunarg || decl instanceof AST_SymbolLambda) {
+                if (decl instanceof AST_SymbolCatch
+                    || decl instanceof AST_SymbolFunarg
+                    || decl instanceof AST_SymbolLambda) {
                     node.in_arg = true;
                     break;
                 }
@@ -249,9 +275,13 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
             }
             if (!sym) {
                 sym = self.def_global(node);
-            } else if (name == "arguments" && sym.scope instanceof AST_Lambda) {
-                if (!(tw.parent() instanceof AST_PropAccess)) {
-                    sym.scope.uses_arguments = "d";
+            } else if (name == "arguments" && is_arguments(sym)) {
+                var parent = tw.parent();
+                if (is_lhs(node, parent)) {
+                    sym.scope.uses_arguments = 3;
+                } else if (sym.scope.uses_arguments < 2
+                    && !(parent instanceof AST_PropAccess && parent.expression === node)) {
+                    sym.scope.uses_arguments = 2;
                 } else if (!sym.scope.uses_arguments) {
                     sym.scope.uses_arguments = true;
                 }
@@ -288,8 +318,9 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
         }
         if (node instanceof AST_SymbolLambda) {
             var def = node.thedef;
-            redefine(node, node.scope.parent_scope.resolve());
-            if (typeof node.thedef.init !== "undefined") {
+            if (!redefine(node, node.scope.parent_scope.resolve())) {
+                delete def.defun;
+            } else if (typeof node.thedef.init !== "undefined") {
                 node.thedef.init = false;
             } else if (def.init) {
                 node.thedef.init = def.init;
@@ -298,12 +329,18 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
         }
     }));
 
+    function is_arguments(sym) {
+        return sym.orig[0] instanceof AST_SymbolFunarg
+            && !(sym.orig[1] instanceof AST_SymbolFunarg || sym.orig[2] instanceof AST_SymbolFunarg)
+            && !is_arrow(sym.scope);
+    }
+
     function redefine(node, scope) {
         var name = node.name;
         var old_def = node.thedef;
         if (!all(old_def.orig, function(sym) {
             return !(sym instanceof AST_SymbolConst || sym instanceof AST_SymbolLet);
-        })) return;
+        })) return false;
         var new_def = scope.find_variable(name);
         if (new_def) {
             var redef = new_def.redefined();
@@ -318,12 +355,12 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
         }
         old_def.defun = new_def.scope;
         old_def.forEach(function(node) {
-            node.redef = true;
+            node.redef = old_def;
             node.thedef = new_def;
             node.reference(options);
         });
-        if (old_def.lambda) new_def.lambda = true;
         if (new_def.undeclared) self.variables.set(name, new_def);
+        return true;
     }
 });
 
@@ -360,6 +397,12 @@ AST_BlockScope.DEFMETHOD("init_vars", function(parent_scope) {
 AST_Scope.DEFMETHOD("init_vars", function(parent_scope) {
     init_scope_vars(this, parent_scope);
 });
+AST_Arrow.DEFMETHOD("init_vars", function(parent_scope) {
+    init_scope_vars(this, parent_scope);
+});
+AST_AsyncArrow.DEFMETHOD("init_vars", function(parent_scope) {
+    init_scope_vars(this, parent_scope);
+});
 AST_Lambda.DEFMETHOD("init_vars", function(parent_scope) {
     init_scope_vars(this, parent_scope);
     this.uses_arguments = false;
@@ -485,6 +528,7 @@ function _default_mangler_options(options) {
         keep_fnames : false,
         reserved    : [],
         toplevel    : false,
+        v8          : false,
         webkit      : false,
     });
     if (!Array.isArray(options.reserved)) options.reserved = [];
@@ -516,7 +560,7 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options) {
             // lname is incremented when we get to the AST_Label
             var save_nesting = lname;
             descend();
-            lname = save_nesting;
+            if (!options.v8 || !in_label(tw)) lname = save_nesting;
             return true;
         }
         if (node instanceof AST_BlockScope) {
@@ -575,6 +619,7 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options) {
             if (!(sym instanceof AST_SymbolConst)) return false;
             var scope = def.scope.resolve();
             if (def.scope === scope) return false;
+            if (def.scope.parent_scope.find_variable(sym.name)) return false;
             redef = scope.def_variable(sym);
             scope.to_mangle.push(redef);
         }
@@ -589,6 +634,14 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options) {
             sym.thedef = def;
         }
     }
+
+    function in_label(tw) {
+        var level = 0, parent;
+        while (parent = tw.parent(level++)) {
+            if (parent instanceof AST_Block) return parent instanceof AST_Toplevel && !options.toplevel;
+            if (parent instanceof AST_LabeledStatement) return true;
+        }
+    }
 });
 
 AST_Toplevel.DEFMETHOD("find_colliding_names", function(options) {

lib/sourcemap.js

@@ -144,7 +144,9 @@ function SourceMap(options) {
             add(source, gen_line, gen_col, orig_line, orig_col, name);
         } : add,
         setSourceContent: sources_content ? function(source, content) {
-            sources_content[source] = content;
+            if (!(source in sources_content)) {
+                sources_content[source] = content;
+            }
         } : noop,
         toString: function() {
             return JSON.stringify({

lib/transform.js

@@ -126,11 +126,27 @@ TreeTransformer.prototype = new TreeWalker;
         self.name = self.name.transform(tw);
         if (self.value) self.value = self.value.transform(tw);
     });
+    DEF(AST_DefaultValue, function(self, tw) {
+        self.name = self.name.transform(tw);
+        self.value = self.value.transform(tw);
+    });
     DEF(AST_Lambda, function(self, tw) {
         if (self.name) self.name = self.name.transform(tw);
         self.argnames = do_list(self.argnames, tw);
+        if (self.rest) self.rest = self.rest.transform(tw);
         self.body = do_list(self.body, tw);
     });
+    function transform_arrow(self, tw) {
+        self.argnames = do_list(self.argnames, tw);
+        if (self.rest) self.rest = self.rest.transform(tw);
+        if (self.value) {
+            self.value = self.value.transform(tw);
+        } else {
+            self.body = do_list(self.body, tw);
+        }
+    }
+    DEF(AST_Arrow, transform_arrow);
+    DEF(AST_AsyncArrow, transform_arrow);
     DEF(AST_Call, function(self, tw) {
         self.expression = self.expression.transform(tw);
         self.args = do_list(self.args, tw);
@@ -168,6 +184,7 @@ TreeTransformer.prototype = new TreeWalker;
     });
     DEF(AST_DestructuredArray, function(self, tw) {
         self.elements = do_list(self.elements, tw);
+        if (self.rest) self.rest = self.rest.transform(tw);
     });
     DEF(AST_DestructuredKeyVal, function(self, tw) {
         if (self.key instanceof AST_Node) self.key = self.key.transform(tw);
@@ -175,6 +192,7 @@ TreeTransformer.prototype = new TreeWalker;
     });
     DEF(AST_DestructuredObject, function(self, tw) {
         self.properties = do_list(self.properties, tw);
+        if (self.rest) self.rest = self.rest.transform(tw);
     });
     DEF(AST_Object, function(self, tw) {
         self.properties = do_list(self.properties, tw);
@@ -183,6 +201,10 @@ TreeTransformer.prototype = new TreeWalker;
         if (self.key instanceof AST_Node) self.key = self.key.transform(tw);
         self.value = self.value.transform(tw);
     });
+    DEF(AST_Template, function(self, tw) {
+        if (self.tag) self.tag = self.tag.transform(tw);
+        self.expressions = do_list(self.expressions, tw);
+    });
 })(function(node, descend) {
     node.DEFMETHOD("transform", function(tw, in_list) {
         var x, y;

lib/utils.js

@@ -238,13 +238,15 @@ function HOP(obj, prop) {
 // return true if the node at the top of the stack (that means the
 // innermost node in the current output) is lexically the first in
 // a statement.
-function first_in_statement(stack) {
+function first_in_statement(stack, arrow) {
     var node = stack.parent(-1);
     for (var i = 0, p; p = stack.parent(i++); node = p) {
-        if (p.TYPE == "Call") {
-            if (p.expression === node) continue;
+        if (is_arrow(p)) {
+            return arrow && p.value === node;
         } else if (p instanceof AST_Binary) {
             if (p.left === node) continue;
+        } else if (p.TYPE == "Call") {
+            if (p.expression === node) continue;
         } else if (p instanceof AST_Conditional) {
             if (p.condition === node) continue;
         } else if (p instanceof AST_PropAccess) {
@@ -253,6 +255,8 @@ function first_in_statement(stack) {
             if (p.expressions[0] === node) continue;
         } else if (p instanceof AST_Statement) {
             return p.body === node;
+        } else if (p instanceof AST_Template) {
+            if (p.tag === node) continue;
         } else if (p instanceof AST_UnaryPostfix) {
             if (p.expression === node) continue;
         }

package.json

@@ -3,7 +3,7 @@
   "description": "JavaScript parser, mangler/compressor and beautifier toolkit",
   "author": "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)",
   "license": "BSD-2-Clause",
-  "version": "3.12.2",
+  "version": "3.12.7",
   "engines": {
     "node": ">=0.8.0"
   },

test/compress.js

@@ -1,6 +1,6 @@
 "use strict";
 
-require("../tools/exit");
+require("../tools/tty");
 
 var assert = require("assert");
 var child_process = require("child_process");
@@ -209,7 +209,7 @@ function reminify(orig_options, input_code, input_formatted, stdout) {
         } else {
             var toplevel = sandbox.has_toplevel(options);
             var expected = stdout[toplevel ? 1 : 0];
-            var actual = run_code(result.code, toplevel);
+            var actual = sandbox.run_code(result.code, toplevel);
             if (typeof expected != "string" && typeof actual != "string" && expected.name == actual.name) {
                 actual = expected;
             }
@@ -244,11 +244,6 @@ function reminify(orig_options, input_code, input_formatted, stdout) {
     return true;
 }
 
-function run_code(code, toplevel) {
-    var result = sandbox.run_code(code, toplevel);
-    return typeof result == "string" ? result.replace(/\u001b\[\d+m/g, "") : result;
-}
-
 function test_case(test) {
     log("    Running test [{name}]", { name: test.name });
     U.AST_Node.enable_validation();
@@ -380,7 +375,7 @@ function test_case(test) {
         }
     }
     if (test.expect_stdout && (!test.node_version || semver.satisfies(process.version, test.node_version))) {
-        var stdout = [ run_code(input_code), run_code(input_code, true) ];
+        var stdout = [ sandbox.run_code(input_code), sandbox.run_code(input_code, true) ];
         var toplevel = sandbox.has_toplevel({
             compress: test.options,
             mangle: test.mangle
@@ -409,7 +404,7 @@ function test_case(test) {
             });
             return false;
         }
-        actual = run_code(output_code, toplevel);
+        actual = sandbox.run_code(output_code, toplevel);
         if (!sandbox.same_stdout(test.expect_stdout, actual)) {
             log([
                 "!!! failed",

test/compress/arguments.js

@@ -78,7 +78,7 @@ replace_index_strict: {
     ]
 }
 
-replace_index_keep_fargs: {
+replace_index_drop_fargs_1: {
     options = {
         arguments: true,
         evaluate: true,
@@ -101,6 +101,13 @@ replace_index_keep_fargs: {
             var arguments;
             console.log(arguments[1], arguments["1"], arguments["foo"]);
         })("bar", 42);
+        (function() {
+            var arguments = {
+                1: "foo",
+                foo: "bar",
+            };
+            console.log(arguments[1], arguments["1"], arguments["foo"]);
+        })("bar", 42);
     }
     expect: {
         var arguments = [];
@@ -114,8 +121,15 @@ replace_index_keep_fargs: {
         (function(arguments) {
             console.log(arguments[1], arguments[1], arguments.foo);
         })("bar", 42);
-        (function() {
+        (function(argument_0, argument_1) {
             var arguments;
+            console.log(argument_1, argument_1, arguments.foo);
+        })("bar", 42);
+        (function() {
+            var arguments = {
+                1: "foo",
+                foo: "bar",
+            };
             console.log(arguments[1], arguments[1], arguments.foo);
         })("bar", 42);
     }
@@ -125,10 +139,11 @@ replace_index_keep_fargs: {
         "42 42 undefined",
         "a a undefined",
         "42 42 undefined",
+        "foo foo bar",
     ]
 }
 
-replace_index_keep_fargs_strict: {
+replace_index_drop_fargs_2: {
     options = {
         arguments: true,
         evaluate: true,
@@ -412,7 +427,7 @@ issue_3273_global_strict_reduce_vars: {
     ]
 }
 
-issue_3273_keep_fargs_false: {
+issue_3273_drop_fargs_1: {
     options = {
         arguments: true,
         keep_fargs: false,
@@ -435,10 +450,10 @@ issue_3273_keep_fargs_false: {
     expect_stdout: "1"
 }
 
-issue_3273_keep_fargs_strict: {
+issue_3273_drop_fargs_2: {
     options = {
         arguments: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
     }
     input: {
@@ -633,7 +648,7 @@ issue_3282_2_passes: {
 issue_3420_1: {
     options = {
         arguments: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
     }
     input: {
         console.log(function() {
@@ -655,7 +670,7 @@ issue_3420_1: {
 issue_3420_2: {
     options = {
         arguments: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
     }
     input: {
         var foo = function() {
@@ -675,7 +690,7 @@ issue_3420_2: {
 issue_3420_3: {
     options = {
         arguments: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
     }
     input: {
         "use strict";
@@ -697,7 +712,7 @@ issue_3420_3: {
 issue_3420_4: {
     options = {
         arguments: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
     }
     input: {
         !function() {
@@ -722,7 +737,7 @@ issue_3420_4: {
 issue_3420_5: {
     options = {
         arguments: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
     }
     input: {
         "use strict";
@@ -749,7 +764,7 @@ issue_3420_5: {
 issue_3420_6: {
     options = {
         arguments: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
     }
     input: {
         console.log(function() {
@@ -767,7 +782,7 @@ issue_3420_6: {
 issue_3420_7: {
     options = {
         arguments: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
     }
     input: {
         "use strict";
@@ -811,7 +826,7 @@ issue_4200: {
 issue_4291_1: {
     options = {
         arguments: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
     }
     input: {
         console.log(function() {
@@ -831,7 +846,7 @@ issue_4291_1: {
 issue_4291_2: {
     options = {
         arguments: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
     }
     input: {
         var a = function() {
@@ -851,3 +866,114 @@ issue_4291_2: {
     }
     expect_stdout: "PASS 42 1"
 }
+
+issue_4397: {
+    options = {
+        arguments: true,
+        keep_fargs: false,
+    }
+    input: {
+        console.log(typeof function() {
+            arguments += 0;
+            return arguments[0];
+        }());
+    }
+    expect: {
+        console.log(typeof function() {
+            arguments += 0;
+            return arguments[0];
+        }());
+    }
+    expect_stdout: "string"
+}
+
+issue_4410_1: {
+    options = {
+        arguments: true,
+        conditionals: true,
+        evaluate: true,
+        reduce_vars: true,
+    }
+    input: {
+        (function(a) {
+            console.log(arguments[0] === (a = 0) ? "FAIL" : "PASS");
+        })(1);
+    }
+    expect: {
+        (function(a) {
+            console.log(a === (a = 0) ? "FAIL" : "PASS");
+        })(1);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_4410_2: {
+    options = {
+        arguments: true,
+        conditionals: true,
+        evaluate: true,
+        reduce_vars: true,
+    }
+    input: {
+        (function f(a) {
+            console.log(arguments[0] === (a = 0) ? "FAIL" : "PASS");
+        })(1);
+    }
+    expect: {
+        (function f(a) {
+            console.log(arguments[0] === (a = 0) ? "FAIL" : "PASS");
+        })(1);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_4410_3: {
+    options = {
+        arguments: true,
+    }
+    input: {
+        var a = 1;
+        (function f(b) {
+            a-- && f();
+            for (var c = 2; c--;)
+                switch (arguments[0]) {
+                  case b = 42:
+                  case 42:
+                    console.log("PASS");
+                }
+        })(null);
+    }
+    expect: {
+        var a = 1;
+        (function f(b) {
+            a-- && f();
+            for (var c = 2; c--;)
+                switch (arguments[0]) {
+                  case b = 42:
+                  case 42:
+                    console.log("PASS");
+                }
+        })(null);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_4432: {
+    options = {
+        arguments: true,
+        reduce_vars: true,
+    }
+    input: {
+        console.log(function(a) {
+            for (a in { FAIL: 42 });
+            return arguments[0];
+        }() || "PASS");
+    }
+    expect: {
+        console.log(function(a) {
+            for (a in { FAIL: 42 });
+            return arguments[0];
+        }() || "PASS");
+    }
+    expect_stdout: "PASS"
+}

test/compress/arrays.js

@@ -13,9 +13,10 @@ holes_and_undefined: {
     }
 }
 
-constant_join: {
+constant_join_1: {
     options = {
         evaluate: true,
+        side_effects: true,
         strings: true,
         unsafe: true,
     }
@@ -57,7 +58,7 @@ constant_join: {
         var c5 = [ boo() + bar() + "foo", 1, 2, 3, "bar", bar() + "foo" ].join();
         var c6 = [ "1,2,,,foo,bar", baz() ].join();
         var d = "foo-3bar-baz";
-        var e = [].join(foo + bar);
+        var e = (foo, bar, "");
         var f = "";
         var g = "";
     }

test/compress/arrows.js

@@ -0,0 +1,680 @@
+no_funarg: {
+    input: {
+        (() => console.log(42))();
+    }
+    expect_exact: "(()=>console.log(42))();"
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+single_funarg: {
+    input: {
+        (a => console.log(a))(42);
+    }
+    expect_exact: "(a=>console.log(a))(42);"
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+multiple_funargs: {
+    input: {
+        ((a, b) => console.log(a, b))("foo", "bar");
+    }
+    expect_exact: '((a,b)=>console.log(a,b))("foo","bar");'
+    expect_stdout: "foo bar"
+    node_version: ">=4"
+}
+
+destructured_funarg: {
+    input: {
+        (([ a, b, c ]) => console.log(a, b, c))("foo");
+    }
+    expect_exact: '(([a,b,c])=>console.log(a,b,c))("foo");'
+    expect_stdout: "f o o"
+    node_version: ">=6"
+}
+
+await_parenthesis: {
+    input: {
+        async function f() {
+            await (a => a);
+        }
+    }
+    expect_exact: "async function f(){await(a=>a)}"
+}
+
+for_parenthesis_init: {
+    input: {
+        for (a => (a in a); console.log(42););
+    }
+    expect_exact: "for((a=>a in a);console.log(42););"
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+for_parenthesis_condition: {
+    input: {
+        for (console.log(42); a => (a in a);)
+            break;
+    }
+    expect_exact: "for(console.log(42);a=>a in a;)break;"
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+for_parenthesis_step: {
+    input: {
+        for (; console.log(42); a => (a in a));
+    }
+    expect_exact: "for(;console.log(42);a=>a in a);"
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+for_assign_parenthesis_init: {
+    input: {
+        for (f = a => (a in a); console.log(42););
+    }
+    expect_exact: "for((f=a=>a in a);console.log(42););"
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+for_assign_parenthesis_condition: {
+    input: {
+        for (console.log(42); f = a => (a in a);)
+            break;
+    }
+    expect_exact: "for(console.log(42);f=a=>a in a;)break;"
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+for_assign_parenthesis_step: {
+    input: {
+        for (; console.log(42); f = a => (a in a));
+    }
+    expect_exact: "for(;console.log(42);f=a=>a in a);"
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+for_declaration_parenthesis_init: {
+    input: {
+        for (var f = a => (a in a); console.log(42););
+    }
+    expect_exact: "for(var f=(a=>a in a);console.log(42););"
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+for_statement_parenthesis_init: {
+    input: {
+        for (a => {
+            a in a;
+        }; console.log(42););
+    }
+    expect_exact: "for(a=>{a in a};console.log(42););"
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+body_call: {
+    input: {
+        (() => {
+            console.log("foo");
+            console.log("bar");
+        })();
+    }
+    expect_exact: '(()=>{console.log("foo");console.log("bar")})();'
+    expect_stdout: [
+        "foo",
+        "bar",
+    ]
+    node_version: ">=4"
+}
+
+body_conditional: {
+    input: {
+        console.log((a => {}) ? "PASS" : "FAIL");
+    }
+    expect_exact: 'console.log((a=>{})?"PASS":"FAIL");'
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
+destructured_object_value: {
+    input: {
+        console.log((a => ({} = a))(42));
+    }
+    expect_exact: "console.log((a=>({}=a))(42));"
+    expect_stdout: "42"
+    node_version: ">=6"
+}
+
+function_value: {
+    input: {
+        console.log((a => function() {
+            return a;
+        })(42)());
+    }
+    expect_exact: "console.log((a=>function(){return a})(42)());"
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+in_value: {
+    input: {
+        console.log((a => a in {
+            foo: 42,
+        })("foo"));
+    }
+    expect_exact: 'console.log((a=>a in{foo:42})("foo"));'
+    expect_stdout: "true"
+    node_version: ">=4"
+}
+
+object_value: {
+    input: {
+        console.log((() => ({
+            4: 2,
+        }))()[4]);
+    }
+    expect_exact: "console.log((()=>({4:2}))()[4]);"
+    expect_stdout: "2"
+    node_version: ">=4"
+}
+
+object_first_in_value: {
+    input: {
+        console.log((a => ({
+            p: a,
+        }.p ? "FAIL" : "PASS"))());
+    }
+    expect_exact: 'console.log((a=>({p:a}).p?"FAIL":"PASS")());'
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
+sequence_value: {
+    input: {
+        console.log((a => (console.log("foo"), a))("bar"));
+    }
+    expect_exact: 'console.log((a=>(console.log("foo"),a))("bar"));'
+    expect_stdout: [
+        "foo",
+        "bar",
+    ]
+    node_version: ">=4"
+}
+
+side_effects_value: {
+    options = {
+        side_effects: true,
+    }
+    input: {
+        console.log((a => function() {
+            return a;
+        })(42)());
+    }
+    expect: {
+        console.log((a => function() {
+            return a;
+        })(42)());
+    }
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+arrow_property: {
+    input: {
+        console.log((a => 42).prototype);
+    }
+    expect_exact: "console.log((a=>42).prototype);"
+    expect_stdout: "undefined"
+    node_version: ">=4"
+}
+
+assign_arrow: {
+    input: {
+        var f = a => a;
+        console.log(f(42));
+    }
+    expect_exact: "var f=a=>a;console.log(f(42));"
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+binary_arrow: {
+    input: {
+        console.log(4 || (() => 2));
+    }
+    expect_exact: "console.log(4||(()=>2));"
+    expect_stdout: "4"
+    node_version: ">=4"
+}
+
+unary_arrow: {
+    input: {
+        console.log(+(() => 42));
+    }
+    expect_exact: "console.log(+(()=>42));"
+    expect_stdout: "NaN"
+    node_version: ">=4"
+}
+
+trailing_comma: {
+    input: {
+        ((a,) => console.log(a))(42);
+    }
+    expect_exact: "(a=>console.log(a))(42);"
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+drop_arguments: {
+    options = {
+        arguments: true,
+        keep_fargs: false,
+    }
+    input: {
+        console.log(function() {
+            return () => arguments[0];
+        }("PASS")("FAIL"));
+    }
+    expect: {
+        console.log(function(argument_0) {
+            return () => argument_0;
+        }("PASS")("FAIL"));
+    }
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
+funarg_arguments: {
+    options = {
+        inline: true,
+    }
+    input: {
+        console.log((arguments => arguments)(42));
+    }
+    expect: {
+        console.log(42);
+    }
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+inline_arguments: {
+    options = {
+        inline: true,
+    }
+    input: {
+        console.log(function() {
+            return () => arguments[0];
+        }("PASS")("FAIL"));
+    }
+    expect: {
+        console.log(function() {
+            return () => arguments[0];
+        }("PASS")("FAIL"));
+    }
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
+var_arguments: {
+    options = {
+        inline: true,
+        properties: true,
+        reduce_vars: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        console.log(function() {
+            return () => {
+                var arguments = [ "PASS" ];
+                return arguments;
+            };
+        }("FAIL 1")("FAIL 2")[0]);
+    }
+    expect: {
+        console.log("PASS");
+    }
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
+negate: {
+    options = {
+        conditionals: true,
+    }
+    input: {
+        if (!console ? 0 : () => 1)
+            console.log("PASS");
+    }
+    expect: {
+        (console ? () => 1 : 0) && console.log("PASS");
+    }
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
+inline_this: {
+    options = {
+        inline: true,
+    }
+    input: {
+        var o = {
+            p: function() {
+                return function() {
+                    return () => this.q;
+                }();
+            },
+            q: "FAIL",
+        };
+        q = "PASS";
+        console.log(o.p()());
+    }
+    expect: {
+        var o = {
+            p: function() {
+                return function() {
+                    return () => this.q;
+                }();
+            },
+            q: "FAIL",
+        };
+        q = "PASS";
+        console.log(o.p()());
+    }
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
+trim_body: {
+    options = {
+        arrows: true,
+        if_return: true,
+        side_effects: true,
+    }
+    input: {
+        var f = a => {
+            return a;
+        };
+        var g = b => void b;
+        console.log(f("PASS"), g("FAIL"));
+    }
+    expect: {
+        var f = a => a;
+        var g = b => {};
+        console.log(f("PASS"), g("FAIL"));
+    }
+    expect_stdout: "PASS undefined"
+    node_version: ">=4"
+}
+
+collapse_value: {
+    options = {
+        arrows: true,
+        collapse_vars: true,
+        keep_fargs: false,
+        unused: true,
+    }
+    input: {
+        var a = 42;
+        console.log((b => Math.floor(b))(a));
+    }
+    expect: {
+        var a = 42;
+        console.log((() => Math.floor(a))());
+    }
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+collapse_property_lambda: {
+    options = {
+        collapse_vars: true,
+        pure_getters: "strict",
+    }
+    input: {
+        console.log(function f() {
+            f.g = () => 42;
+            return f.g();
+        }());
+    }
+    expect: {
+        console.log(function f() {
+            return (f.g = () => 42)();
+        }());
+    }
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+drop_return: {
+    options = {
+        side_effects: true,
+    }
+    input: {
+        (a => {
+            while (!console);
+            return console.log(a);
+        })(42);
+    }
+    expect: {
+        (a => {
+            while (!console);
+            console.log(a);
+        })(42);
+    }
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+reduce_iife_1: {
+    options = {
+        evaluate: true,
+        keep_fargs: false,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (a => console.log(a + a))(21);
+    }
+    expect: {
+        (() => console.log(42))();
+    }
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+reduce_iife_2: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = 21;
+        (() => console.log(a + a))();
+    }
+    expect: {
+        (() => console.log(42))();
+    }
+    expect_stdout: "42"
+    node_version: ">=4"
+}
+
+reduce_iife_3: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = "foo";
+        (() => {
+            console.log(a);
+            console.log(a);
+        })();
+        a = "bar";
+    }
+    expect: {
+        (() => {
+            console.log("foo");
+            console.log("foo");
+        })();
+    }
+    expect_stdout: [
+        "foo",
+        "foo",
+    ]
+    node_version: ">=4"
+}
+
+single_use_recursive: {
+    options = {
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        function f() {
+            return (() => f)();
+        }
+        console.log(typeof f());
+    }
+    expect: {
+        console.log(typeof function f() {
+            return (() => f)();
+        }());
+    }
+    expect_stdout: "function"
+    node_version: ">=4"
+}
+
+issue_4388: {
+    options = {
+        inline: true,
+        toplevel: true,
+    }
+    input: {
+        (arguments => console.log(arguments && arguments))();
+    }
+    expect: {
+        (arguments => console.log(arguments && arguments))();
+    }
+    expect_stdout: "undefined"
+    node_version: ">=4"
+}
+
+issue_4390: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        function log() {
+            console.log.apply(console, arguments);
+        }
+        var a = 42, b = "FAIL";
+        b = "PASS";
+        (c => log(b, c))(a);
+        log(b);
+    }
+    expect: {
+        function log() {
+            console.log.apply(console, arguments);
+        }
+        var a = 42, b = "FAIL";
+        b = "PASS";
+        (c => log(b, c))(a);
+        log(b);
+    }
+    expect_stdout: [
+        "PASS 42",
+        "PASS",
+    ]
+    node_version: ">=4"
+}
+
+issue_4401: {
+    options = {
+        merge_vars: true,
+    }
+    input: {
+        (function() {
+            var a = (b => b(a))(console.log || a);
+            var c = console.log;
+            c && c(typeof b);
+        })();
+    }
+    expect: {
+        (function() {
+            var a = (b => b(a))(console.log || a);
+            var c = console.log;
+            c && c(typeof b);
+        })();
+    }
+    expect_stdout: [
+        "undefined",
+        "undefined",
+    ]
+    node_version: ">=4"
+}
+
+issue_4448: {
+    options = {
+        pure_getters: "strict",
+        side_effects: true,
+    }
+    input: {
+        var A;
+        try {
+            (arguments => {
+                arguments[0];
+            })(A);
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect: {
+        var A;
+        try {
+            (arguments => {
+                arguments[0];
+            })(A);
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
+issue_4476: {
+    options = {
+        arguments: true,
+    }
+    input: {
+        (function(a, b) {
+            (a => {
+                console.log(arguments[0], a);
+            })(b);
+        })("foo", "bar");
+    }
+    expect: {
+        (function(a, b) {
+            (a => {
+                console.log(arguments[0], a);
+            })(b);
+        })("foo", "bar");
+    }
+    expect_stdout: "foo bar"
+    node_version: ">=4"
+}

test/compress/assignments.js

@@ -461,3 +461,17 @@ issue_3949_2: {
     }
     expect_stdout: "100"
 }
+
+issue_4521: {
+    options = {
+        assignments: true,
+        dead_code: true,
+    }
+    input: {
+        var a = (a = 42 | a) ? console.log(a) : 0;
+    }
+    expect: {
+        var a = (a |= 42) ? console.log(a) : 0;
+    }
+    expect_stdout: "42"
+}

test/compress/async.js

@@ -1,498 +0,0 @@
-await_await: {
-    input: {
-        (async function() {
-            console.log("PASS");
-            await await 42;
-        })();
-    }
-    expect: {
-        (async function() {
-            console.log("PASS");
-            await await 42;
-        })();
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-defun_name: {
-    input: {
-        async function await() {
-            console.log("PASS");
-        }
-        await();
-    }
-    expect: {
-        async function await() {
-            console.log("PASS");
-        }
-        await();
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-nested_await: {
-    input: {
-        (async function() {
-            console.log(function(await) {
-                return await;
-            }("PASS"));
-        })();
-    }
-    expect: {
-        (async function() {
-            console.log(function(await) {
-                return await;
-            }("PASS"));
-        })();
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-reduce_single_use_defun: {
-    options = {
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        async function f(a) {
-            console.log(a);
-        }
-        f("PASS");
-    }
-    expect: {
-        (async function(a) {
-            console.log(a);
-        })("PASS");
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-dont_inline: {
-    options = {
-        inline: true,
-    }
-    input: {
-        (async function() {
-            A;
-        })().catch(function() {});
-        console.log("PASS");
-    }
-    expect: {
-        (async function() {
-            A;
-        })().catch(function() {});
-        console.log("PASS");
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-evaluate: {
-    options = {
-        evaluate: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var a = async function() {}();
-        console.log(typeof a);
-    }
-    expect: {
-        var a = async function() {}();
-        console.log(typeof a);
-    }
-    expect_stdout: "object"
-    node_version: ">=8"
-}
-
-negate: {
-    options = {
-        side_effects: true,
-    }
-    input: {
-        console && async function() {} && console.log("PASS");
-    }
-    expect: {
-        console && async function() {} && console.log("PASS");
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-negate_iife: {
-    options = {
-        negate_iife: true,
-    }
-    input: {
-        (async function() {
-            console.log("PASS");
-        })();
-    }
-    expect: {
-        !async function() {
-            console.log("PASS");
-        }();
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-collapse_vars_1: {
-    options = {
-        collapse_vars: true,
-    }
-    input: {
-        var a = "FAIL";
-        (async function() {
-            a = "PASS";
-            await 42;
-            return "PASS";
-        })();
-        console.log(a);
-    }
-    expect: {
-        var a = "FAIL";
-        (async function() {
-            a = "PASS";
-            await 42;
-            return "PASS";
-        })();
-        console.log(a);
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-collapse_vars_2: {
-    options = {
-        collapse_vars: true,
-    }
-    input: {
-        var a = "FAIL";
-        (async function() {
-            await (a = "PASS");
-            return "PASS";
-        })();
-        console.log(a);
-    }
-    expect: {
-        var a = "FAIL";
-        (async function() {
-            await (a = "PASS");
-            return "PASS";
-        })();
-        console.log(a);
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-collapse_vars_3: {
-    options = {
-        collapse_vars: true,
-    }
-    input: {
-        var a = "FAIL";
-        (async function() {
-            await (a = "PASS", 42);
-            return "PASS";
-        })();
-        console.log(a);
-    }
-    expect: {
-        var a = "FAIL";
-        (async function() {
-            await (a = "PASS", 42);
-            return "PASS";
-        })();
-        console.log(a);
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-issue_4335_1: {
-    options = {
-        inline: true,
-    }
-    input: {
-        var await = "PASS";
-        (async function() {
-            console.log(function() {
-                return await;
-            }());
-        })();
-    }
-    expect: {
-        var await = "PASS";
-        (async function() {
-            console.log(function() {
-                return await;
-            }());
-        })();
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-issue_4335_2: {
-    options = {
-        inline: true,
-    }
-    input: {
-        (async function() {
-            console.log(function() {
-                function await() {}
-                return "PASS";
-            }());
-        })();
-    }
-    expect: {
-        (async function() {
-            console.log(function() {
-                function await() {}
-                return "PASS";
-            }());
-        })();
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-issue_4337: {
-    options = {
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        (function(a) {
-            a();
-        })(async function() {
-            console.log("PASS");
-        });
-    }
-    expect: {
-        (function(a) {
-            (async function() {
-                console.log("PASS");
-            })();
-        })();
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-issue_4340: {
-    options = {
-        evaluate: true,
-        reduce_vars: true,
-    }
-    input: {
-        (async function a(a) {
-            console.log(a || "PASS");
-        })();
-    }
-    expect: {
-        (async function a(a) {
-            console.log(a || "PASS");
-        })();
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-call_expression: {
-    input: {
-        console.log(typeof async function(log) {
-            (await log)("FAIL");
-        }(console.log).then);
-    }
-    expect_exact: 'console.log(typeof async function(log){(await log)("FAIL")}(console.log).then);'
-    expect_stdout: "function"
-    node_version: ">=8"
-}
-
-property_access_expression: {
-    input: {
-        console.log(typeof async function(con) {
-            (await con).log("FAIL");
-        }(console).then);
-    }
-    expect_exact: 'console.log(typeof async function(con){(await con).log("FAIL")}(console).then);'
-    expect_stdout: "function"
-    node_version: ">=8"
-}
-
-issue_4347_1: {
-    options = {
-        evaluate: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var a = "foo";
-        f();
-        a = "bar";
-        f();
-        async function f() {
-            console.log(a);
-        }
-    }
-    expect: {
-        var a = "foo";
-        f();
-        a = "bar";
-        f();
-        async function f() {
-            console.log(a);
-        }
-    }
-    expect_stdout: [
-        "foo",
-        "bar",
-    ]
-    node_version: ">=8"
-}
-
-issue_4347_2: {
-    options = {
-        evaluate: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var a = "PASS";
-        (async function() {
-            throw 42;
-            a = "FAIL";
-        })();
-        console.log(a);
-    }
-    expect: {
-        var a = "PASS";
-        (async function() {
-            throw 42;
-            a = "FAIL";
-        })();
-        console.log(a);
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-issue_4349_1: {
-    input: {
-        console.log(typeof async function() {
-            await /abc/;
-        }().then);
-    }
-    expect_exact: "console.log(typeof async function(){await/abc/}().then);"
-    expect_stdout: "function"
-    node_version: ">=8"
-}
-
-issue_4349_2: {
-    options = {
-        collapse_vars: true,
-        unused: true,
-    }
-    input: {
-        console.log(typeof async function() {
-            (function(a) {
-                this[a];
-            }(await 0));
-        }().then);
-    }
-    expect: {
-        console.log(typeof async function() {
-            (function(a) {
-                this[a];
-            }(await 0));
-        }().then);
-    }
-    expect_stdout: "function"
-    node_version: ">=8"
-}
-
-issue_4349_3: {
-    options = {
-        collapse_vars: true,
-        unused: true,
-    }
-    input: {
-        console.log(typeof function(await) {
-            return async function(a) {
-                this[a];
-            }(await);
-        }(this).then);
-    }
-    expect: {
-        console.log(typeof function(await) {
-            return async function(a) {
-                this[a];
-            }(await);
-        }(this).then);
-    }
-    expect_stdout: "function"
-    node_version: ">=8"
-}
-
-issue_4359: {
-    options = {
-        collapse_vars: true,
-        unused: true,
-    }
-    input: {
-        try {
-            (async function(a) {
-                return a;
-            })(A);
-        } catch (e) {
-            console.log("PASS");
-        }
-    }
-    expect: {
-        try {
-            (async function(a) {
-                return a;
-            })(A);
-        } catch (e) {
-            console.log("PASS");
-        }
-    }
-    expect_stdout: "PASS"
-    node_version: ">=8"
-}
-
-issue_4377: {
-    options = {
-        dead_code: true,
-        inline: true,
-        side_effects: true,
-    }
-    input: {
-        console.log(typeof function() {
-            return function() {
-                f;
-                async function f() {}
-                return f();
-            }();
-        }().then);
-    }
-    expect: {
-        console.log(typeof function() {
-            return f();
-            async function f() {}
-        }().then);
-    }
-    expect_stdout: "function"
-    node_version: ">=8"
-}

test/compress/bigint.js

@@ -0,0 +1,62 @@
+arithmetic: {
+    input: {
+        console.log(((1n + 0x2n) * (0o3n - -4n)) >> (5n - 6n));
+    }
+    expect_exact: "console.log((1n+0x2n)*(0o3n- -4n)>>5n-6n);"
+    expect_stdout: "42n"
+    node_version: ">=10"
+}
+
+minus_dot: {
+    input: {
+        console.log(typeof -42n.toString(), typeof (-42n).toString());
+    }
+    expect_exact: "console.log(typeof-42n.toString(),typeof(-42n).toString());"
+    expect_stdout: "number string"
+    node_version: ">=10"
+}
+
+evaluate: {
+    options = {
+        evaluate: true,
+        unsafe: true,
+    }
+    input: {
+        console.log((0xDEAD_BEEFn).toString(16));
+    }
+    expect: {
+        console.log(0xdeadbeefn.toString(16));
+    }
+    expect_stdout: "deadbeef"
+    node_version: ">=10"
+}
+
+Number: {
+    options = {
+        unsafe: true,
+    }
+    input: {
+        console.log(Number(-0xfeed_dead_beef_badn));
+    }
+    expect: {
+        console.log(+("" + -0xfeed_dead_beef_badn));
+    }
+    expect_stdout: "-1148098955808013200"
+    node_version: ">=10"
+}
+
+issue_4590: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        A = 1;
+        0n || console.log("PASS");
+    }
+    expect: {
+        A = 1;
+        0n || console.log("PASS");
+    }
+    expect_stdout: "PASS"
+    node_version: ">=10"
+}

test/compress/collapse_vars.js

@@ -3145,8 +3145,8 @@ issue_2313_2: {
         var c = 0;
         !function a() {
             a && c++;
-            var a = 0;
-            a && c++;
+            var a;
+            (a = 0) && c++;
         }();
         console.log(c);
     }
@@ -4273,8 +4273,8 @@ issue_2436_14: {
         var b = {};
         (function() {
             a && function(c, d) {
-                console.log(c, d);
-            }(b, a);
+                console.log(b, d);
+            }(0, a);
         })();
     }
     expect_stdout: true
@@ -5502,8 +5502,7 @@ collapse_rhs_lhs_2: {
     expect: {
         var b = 1;
         (function f(f) {
-            f = b;
-            f[b] = 0;
+            b[b] = 0;
         })();
         console.log("PASS");
     }
@@ -5609,6 +5608,7 @@ collapse_rhs_array: {
 collapse_rhs_boolean_1: {
     options = {
         collapse_vars: true,
+        evaluate: true,
     }
     input: {
         var a, b;
@@ -5634,6 +5634,7 @@ collapse_rhs_boolean_1: {
 collapse_rhs_boolean_2: {
     options = {
         collapse_vars: true,
+        evaluate: true,
     }
     input: {
         var a;
@@ -5668,6 +5669,7 @@ collapse_rhs_boolean_3: {
         booleans: true,
         collapse_vars: true,
         conditionals: true,
+        evaluate: true,
     }
     input: {
         var a, f, g, h, i, n, s, t, x, y;
@@ -5721,6 +5723,7 @@ collapse_rhs_function: {
 collapse_rhs_number: {
     options = {
         collapse_vars: true,
+        evaluate: true,
     }
     input: {
         var a, b;
@@ -5800,6 +5803,7 @@ collapse_rhs_regexp: {
 collapse_rhs_string: {
     options = {
         collapse_vars: true,
+        evaluate: true,
     }
     input: {
         var a, b;
@@ -5996,7 +6000,7 @@ issue_3215_1: {
         }());
     }
     expect: {
-        console.log(typeof 42);
+        console.log("number");
     }
     expect_stdout: "number"
 }
@@ -8602,3 +8606,152 @@ issue_4248: {
     }
     expect_stdout: "1"
 }
+
+issue_4430_1: {
+    options = {
+        collapse_vars: true,
+        pure_getters: "strict",
+    }
+    input: {
+        function f(a) {
+            switch (a = 1, arguments[0]) {
+              case 1:
+                return "PASS";
+              case 2:
+                return "FAIL";
+            }
+        }
+        console.log(f(2));
+    }
+    expect: {
+        function f(a) {
+            switch (a = 1, arguments[0]) {
+              case 1:
+                return "PASS";
+              case 2:
+                return "FAIL";
+            }
+        }
+        console.log(f(2));
+    }
+    expect_stdout: "PASS"
+}
+
+issue_4430_2: {
+    options = {
+        collapse_vars: true,
+        pure_getters: "strict",
+    }
+    input: {
+        function f(a) {
+            switch (a = 0, arguments[0]) {
+              case 0:
+                return "PASS";
+              case 1:
+                return "FAIL";
+            }
+        }
+        console.log(f(1));
+    }
+    expect: {
+        function f(a) {
+            switch (arguments[a = 0]) {
+              case 0:
+                return "PASS";
+              case 1:
+                return "FAIL";
+            }
+        }
+        console.log(f(1));
+    }
+    expect_stdout: "PASS"
+}
+
+collapse_and_assign: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        var log = console.log;
+        var a = {
+            p: "PASS",
+        };
+        console && (a = a.p);
+        log(a);
+    }
+    expect: {
+        var log = console.log;
+        var a = {
+            p: "PASS",
+        };
+        log(a = console ? a.p : a);
+    }
+    expect_stdout: "PASS"
+}
+
+collapse_or_assign: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        var log = console.log;
+        var a = {
+            p: "PASS",
+        };
+        a.q || (a = a.p);
+        log(a);
+    }
+    expect: {
+        var log = console.log;
+        var a = {
+            p: "PASS",
+        };
+        log(a = !a.q ? a.p : a);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_4586_1: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        var a = 42;
+        (function f(b) {
+            var b = a;
+            if (b === arguments[0])
+                console.log("PASS");
+        })(console);
+    }
+    expect: {
+        var a = 42;
+        (function f(b) {
+            var b = a;
+            if (b === arguments[0])
+                console.log("PASS");
+        })(console);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_4586_2: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        var a = 42;
+        (function f(b) {
+            b = a;
+            if (b === arguments[0])
+                console.log("PASS");
+        })(console);
+    }
+    expect: {
+        var a = 42;
+        (function f(b) {
+            if ((b = a) === arguments[0])
+                console.log("PASS");
+        })(console);
+    }
+    expect_stdout: "PASS"
+}

test/compress/const.js

@@ -658,6 +658,30 @@ legacy_scope: {
     expect_stdout: true
 }
 
+hoist_vars: {
+    options = {
+        hoist_vars: true,
+    }
+    input: {
+        {
+            const a = "FAIL";
+            var b = 42;
+        }
+        var a = "PASS";
+        console.log(a, b);
+    }
+    expect: {
+        var b;
+        {
+            const a = "FAIL";
+            b = 42;
+        }
+        var a = "PASS";
+        console.log(a, b);
+    }
+    expect_stdout: true
+}
+
 issue_4191: {
     options = {
         functions: true,
@@ -1375,3 +1399,38 @@ issue_4365_2: {
     }
     expect_stdout: true
 }
+
+issue_4527: {
+    mangle = {}
+    input: {
+        (function() {
+            try {
+                throw 1;
+            } catch (a) {
+                try {
+                    const a = FAIL;
+                } finally {
+                    if (!b)
+                        return console.log("aaaa");
+                }
+            }
+            var b;
+        })();
+    }
+    expect: {
+        (function() {
+            try {
+                throw 1;
+            } catch (a) {
+                try {
+                    const a = FAIL;
+                } finally {
+                    if (!t)
+                        return console.log("aaaa");
+                }
+            }
+            var t;
+        })();
+    }
+    expect_stdout: "aaaa"
+}

test/compress/dead-code.js

@@ -725,7 +725,7 @@ issue_2749: {
     expect: {
         var a = 2, c = "PASS";
         while (a--)
-            b = void 0, b ? c = "FAIL" : b = 1;
+            b = void 0, b ? c = "FAIL" : 1;
         var b;
         console.log(c);
     }
@@ -1399,3 +1399,21 @@ issue_4366: {
     expect_stdout: "PASS"
     node_version: ">=4"
 }
+
+issue_4570: {
+    options = {
+        dead_code: true,
+        inline: true,
+    }
+    input: {
+        var a = function(b) {
+            return a += b;
+        }() ? 0 : a;
+        console.log(a);
+    }
+    expect: {
+        var a = (a += void 0) ? 0 : a;
+        console.log(a);
+    }
+    expect_stdout: "NaN"
+}

test/compress/destructured.js

@@ -40,7 +40,7 @@ redefine_arguments_2: {
 
 redefine_arguments_3: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -188,7 +188,7 @@ funarg_side_effects_1: {
     }
     expect: {
         try {
-            (function({}) {})();
+            [ {} ] = [];
         } catch (e) {
             console.log("PASS");
         }
@@ -259,7 +259,7 @@ funarg_side_effects_3: {
 
 funarg_unused_1: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -318,7 +318,7 @@ funarg_unused_3: {
 
 funarg_unused_4: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         pure_getters: "strict",
         unused: true,
     }
@@ -384,7 +384,7 @@ funarg_unused_6_inline: {
 
 funarg_unused_6_keep_fargs: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -426,7 +426,7 @@ funarg_collapse_vars_1: {
 funarg_collapse_vars_2: {
     options = {
         collapse_vars: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -505,7 +505,7 @@ funarg_reduce_vars_1: {
 funarg_reduce_vars_2: {
     options = {
         evaluate: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         pure_getters: "strict",
         reduce_vars: true,
         unsafe: true,
@@ -682,7 +682,7 @@ funarg_inline: {
     }
     expect: {
         try {
-            (function({}) {})();
+            [ {} ] = [];
         } catch (e) {
             console.log("PASS");
         }
@@ -691,6 +691,28 @@ funarg_inline: {
     node_version: ">=6"
 }
 
+process_boolean_returns: {
+    options = {
+        booleans: true,
+    }
+    input: {
+        console.log(function({ length }) {
+            return length ? "FAIL" : "PASS";
+        }(function() {
+            return 42;
+        }));
+    }
+    expect: {
+        console.log(function({ length }) {
+            return length ? "FAIL" : "PASS";
+        }(function() {
+            return 42;
+        }));
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
 simple_const: {
     options = {
         evaluate: true,
@@ -750,6 +772,46 @@ simple_var: {
     node_version: ">=6"
 }
 
+drop_catch: {
+    options = {
+        dead_code: true,
+    }
+    input: {
+        try {} catch ({
+            [console.log("FAIL")]: e,
+        }) {} finally {
+            console.log("PASS");
+        }
+    }
+    expect: {
+        console.log("PASS");
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+drop_catch_var: {
+    options = {
+        unused: true,
+    }
+    input: {
+        try {
+            throw new Error("PASS");
+        } catch ({ name, message }) {
+            console.log(message);
+        }
+    }
+    expect: {
+        try {
+            throw new Error("PASS");
+        } catch ({ message }) {
+            console.log(message);
+        }
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
 collapse_vars_1: {
     options = {
         collapse_vars: true,
@@ -1061,7 +1123,7 @@ join_vars: {
 
 keep_fargs: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -1296,6 +1358,24 @@ fn_name_unused: {
     node_version: ">=6"
 }
 
+hoist_vars: {
+    options = {
+        hoist_vars: true,
+    }
+    input: {
+        var a = "PASS";
+        var [ b ] = [ 42 ];
+        console.log(a, b);
+    }
+    expect: {
+        var a = "PASS";
+        var [ b ] = [ 42 ];
+        console.log(a, b);
+    }
+    expect_stdout: "PASS 42"
+    node_version: ">=6"
+}
+
 issue_4280: {
     options = {
         evaluate: true,
@@ -1638,10 +1718,14 @@ issue_4312: {
     expect: {
         var a;
         b = "PASS",
-        (function({
-            [a = b]: d,
-        }){})((c = "FAIL") && c);
-        var b, c;
+        c = "FAIL",
+        [
+            {
+                [a = b]: d,
+            },
+        ] = [ c && c ],
+        void 0;
+        var b, c, d;
         console.log(a);
     }
     expect_stdout: "PASS"
@@ -1703,9 +1787,7 @@ issue_4319: {
         function f(a) {
             while (!a);
         }
-        console.log(function({}) {
-            return f(console);
-        }(0));
+        console.log(([ {} ] = [ 0 ], f(console)));
     }
     expect_stdout: "undefined"
     node_version: ">=6"
@@ -1714,7 +1796,7 @@ issue_4319: {
 issue_4321: {
     options = {
         inline: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
     }
     input: {
         try {
@@ -1729,11 +1811,9 @@ issue_4321: {
     }
     expect: {
         try {
-            console.log(function({}) {
-                return function() {
-                    while (!console);
-                }();
-            }());
+            console.log(([ {} ] = [], function() {
+                while (!console);
+            }()));
         } catch (e) {
             console.log("PASS");
         }
@@ -1764,11 +1844,15 @@ issue_4323: {
     }
     expect: {
         var a = 0;
-        (function({
-            [function a() {
-                console.log(typeof a);
-            }()]: d,
-        }) {})(0);
+        [
+            {
+                [function a() {
+                    console.log(typeof a);
+                }()]: d,
+            },
+        ] = [ 0 ],
+        void 0;
+        var d;
         e = 1,
         console.log,
         void e.p;
@@ -1844,3 +1928,631 @@ issue_4372_2: {
     expect_stdout: "PASS"
     node_version: ">=6"
 }
+
+issue_4383: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        unsafe: true,
+    }
+    input: {
+        console.log(function(a) {
+            [ a[0] ] = [];
+            return a.length;
+        }([]));
+    }
+    expect: {
+        console.log(function(a) {
+            [ a[0] ] = [];
+            return a.length;
+        }([]));
+    }
+    expect_stdout: "1"
+    node_version: ">=6"
+}
+
+issue_4386: {
+    options = {
+        arguments: true,
+    }
+    input: {
+        function f({}) {
+            return arguments[0];
+        }
+        console.log(f("PASS"));
+    }
+    expect: {
+        function f({}) {
+            return arguments[0];
+        }
+        console.log(f("PASS"));
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+issue_4395: {
+    options = {
+        arguments: true,
+    }
+    input: {
+        console.log(function(a, {}) {
+            a = "FAIL";
+            return arguments[0];
+        }("PASS", 42));
+    }
+    expect: {
+        console.log(function(a, {}) {
+            a = "FAIL";
+            return arguments[0];
+        }("PASS", 42));
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+issue_4399: {
+    options = {
+        arguments: true,
+    }
+    input: {
+        console.log(function({
+            [arguments[1]]: a,
+        }, b) {
+            return a;
+        }([ "PASS" ], 0));
+    }
+    expect: {
+        console.log(function({
+            [arguments[1]]: a,
+        }, b) {
+            return a;
+        }([ "PASS" ], 0));
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+issue_4420: {
+    options = {
+        unused: true,
+    }
+    input: {
+        console.log(function() {
+            var a = 1;
+            try {
+                throw [ "FAIL", "PASS" ];
+            } catch ({
+                [a]: b,
+            }) {
+                let a = 0;
+                return b;
+            }
+        }());
+    }
+    expect: {
+        console.log(function() {
+            var a = 1;
+            try {
+                throw [ "FAIL", "PASS" ];
+            } catch ({
+                [a]: b,
+            }) {
+                return b;
+            }
+        }());
+    }
+    expect_stdout: "PASS"
+    node_version: ">=8"
+}
+
+issue_4425: {
+    rename = true
+    input: {
+        var a;
+        console.log(function() {
+            try {
+                try {
+                    throw 42;
+                } catch ({
+                    [a]: a,
+                }) {}
+                return "FAIL";
+            } catch (e) {
+                return "PASS";
+            }
+        }());
+    }
+    expect: {
+        var a;
+        console.log(function() {
+            try {
+                try {
+                    throw 42;
+                } catch ({
+                    [b]: b,
+                }) {}
+                return "FAIL";
+            } catch (c) {
+                return "PASS";
+            }
+        }());
+    }
+    expect_stdout: "PASS"
+    node_version: ">=8"
+}
+
+issue_4436_Infinity: {
+    options = {
+        unused: true,
+    }
+    input: {
+        console.log(function({
+            [delete Infinity]: a,
+        }) {
+            var Infinity;
+            return a;
+        }({
+            true: "FAIL",
+            false: "PASS",
+        }));
+    }
+    expect: {
+        console.log(function({
+            [delete Infinity]: a,
+        }) {
+            return a;
+        }({
+            true: "FAIL",
+            false: "PASS",
+        }));
+    }
+    expect_stdout: true
+    node_version: ">=6"
+}
+
+issue_4436_NaN: {
+    options = {
+        unused: true,
+    }
+    input: {
+        console.log(function({
+            [delete NaN]: a,
+        }) {
+            var NaN;
+            return a;
+        }({
+            true: "FAIL",
+            false: "PASS",
+        }));
+    }
+    expect: {
+        console.log(function({
+            [delete NaN]: a,
+        }) {
+            return a;
+        }({
+            true: "FAIL",
+            false: "PASS",
+        }));
+    }
+    expect_stdout: true
+    node_version: ">=6"
+}
+
+issue_4436_undefined: {
+    options = {
+        unused: true,
+    }
+    input: {
+        console.log(function({
+            [delete undefined]: a,
+        }) {
+            var undefined;
+            return a;
+        }({
+            true: "FAIL",
+            false: "PASS",
+        }));
+    }
+    expect: {
+        console.log(function({
+            [delete undefined]: a,
+        }) {
+            return a;
+        }({
+            true: "FAIL",
+            false: "PASS",
+        }));
+    }
+    expect_stdout: true
+    node_version: ">=6"
+}
+
+issue_4446: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        a = "PASS";
+        var a = [ a[0] ] = [ a ];
+        console.log(a[0]);
+    }
+    expect: {
+        a = "PASS";
+        var a = [ a[0] ] = [ a ];
+        console.log(a[0]);
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+issue_4456: {
+    options = {
+        pure_getters: "strict",
+        unused: true,
+    }
+    input: {
+        var o = {
+            set p(v) {
+                console.log(v);
+            },
+        };
+        [ function() {
+            try {
+                return o;
+            } catch ({}) {}
+        }().p ] = [ "PASS" ];
+    }
+    expect: {
+        var o = {
+            set p(v) {
+                console.log(v);
+            },
+        };
+        [ function() {
+            try {
+                return o;
+            } catch ({}) {}
+        }().p ] = [ "PASS" ];
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+issue_4485_1: {
+    options = {
+        pure_getters: "strict",
+        side_effects: true,
+    }
+    input: {
+        (function([]) {
+            var arguments;
+            try {
+                arguments.length;
+            } catch (e) {
+                console.log("PASS");
+            }
+        })([]);
+    }
+    expect: {
+        (function([]) {
+            var arguments;
+            try {
+                arguments.length;
+            } catch (e) {
+                console.log("PASS");
+            }
+        })([]);
+    }
+    expect_stdout: true
+    node_version: ">=6"
+}
+
+issue_4485_2: {
+    options = {
+        pure_getters: "strict",
+        side_effects: true,
+    }
+    input: {
+        (function([]) {
+            var arguments = null;
+            try {
+                arguments.length;
+            } catch (e) {
+                console.log("PASS");
+            }
+        })([]);
+    }
+    expect: {
+        (function([]) {
+            var arguments = null;
+            try {
+                arguments.length;
+            } catch (e) {
+                console.log("PASS");
+            }
+        })([]);
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+issue_4485_3: {
+    options = {
+        keep_fargs: false,
+        unused: true,
+    }
+    input: {
+        (function([]) {
+            var arguments;
+            try {
+                arguments.length;
+            } catch (e) {
+                console.log("PASS");
+            }
+        })([]);
+    }
+    expect: {
+        (function([]) {
+            var arguments;
+            try {
+                arguments.length;
+            } catch (e) {
+                console.log("PASS");
+            }
+        })([]);
+    }
+    expect_stdout: true
+    node_version: ">=6"
+}
+
+issue_4500: {
+    options = {
+        evaluate: true,
+        keep_fnames: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = function f(b) {
+            return [ b ] = [], b;
+        }("FAIL");
+        console.log(a || "PASS");
+    }
+    expect: {
+        var a = function f(b) {
+            return [ b ] = [], b;
+        }("FAIL");
+        console.log(a || "PASS");
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+issue_4504: {
+    options = {
+        inline: true,
+        merge_vars: true,
+    }
+    input: {
+        A = "FAIL";
+        (function f(a) {
+            ({
+                [console.log(a)]: 0[(b => console + b)(A)]
+            } = 0);
+        })("PASS");
+    }
+    expect: {
+        A = "FAIL";
+        (function f(a) {
+            ({
+                [console.log(a)]: 0[b = A, console + b]
+            } = 0);
+            var b;
+        })("PASS");
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+issue_4508: {
+    options = {
+        inline: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        for (var i = 0; i < 2; i++)
+            (function f([ a ]) {
+                var a = console.log(a) && b, b = null;
+            })([ "PASS" ]);
+    }
+    expect: {
+        for (var i = 0; i < 2; i++)
+            [ [ a ] ] = [ [ "PASS" ] ],
+            b = void 0,
+            a = console.log(a) && b,
+            b = null,
+            void 0;
+        var a, b;
+    }
+    expect_stdout: [
+        "PASS",
+        "PASS",
+    ]
+    node_version: ">=6"
+}
+
+issue_4512: {
+    options = {
+        side_effects: true,
+    }
+    input: {
+        console.log(function([ a, b = a ]) {}([]));
+    }
+    expect: {
+        console.log(function([ a, b = a ]) {}([]));
+    }
+    expect_stdout: "undefined"
+    node_version: ">=6"
+}
+
+issue_4519_1: {
+    options = {
+        arguments: true,
+        keep_fargs: false,
+    }
+    input: {
+        try {
+            (function() {
+                var [ arguments ] = [];
+                arguments[0];
+            })();
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect: {
+        try {
+            (function() {
+                var [ arguments ] = [];
+                arguments[0];
+            })();
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+issue_4519_2: {
+    options = {
+        pure_getters: "strict",
+        side_effects: true,
+    }
+    input: {
+        try {
+            (function() {
+                var [ arguments ] = [];
+                arguments[0];
+            })();
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect: {
+        try {
+            (function() {
+                var [ arguments ] = [];
+                arguments[0];
+            })();
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+issue_4554: {
+    options = {
+        collapse_vars: true,
+        unused: true,
+    }
+    input: {
+        A = "PASS";
+        var a = "FAIL";
+        try {
+            (function({}, b) {
+                return b;
+            })(void 0, a = A);
+        } catch (e) {
+            console.log(a);
+        }
+    }
+    expect: {
+        A = "PASS";
+        var a = "FAIL";
+        try {
+            (function({}, b) {
+                return b;
+            })(void 0, a = A);
+        } catch (e) {
+            console.log(a);
+        }
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+issue_4584: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+    }
+    input: {
+        try {
+            (function f({
+                [console.log(a = "FAIL")]: a,
+            }) {})(0);
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect: {
+        try {
+            (function f({
+                [console.log(a = "FAIL")]: a,
+            }) {})(0);
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+issue_4608_1: {
+    options = {
+        arguments: true,
+        keep_fargs: false,
+    }
+    input: {
+        (function() {
+            [ arguments ] = [ "foo" ];
+            console.log(arguments[0]);
+        })();
+    }
+    expect: {
+        (function() {
+            [ arguments ] = [ "foo" ];
+            console.log(arguments[0]);
+        })();
+    }
+    expect_stdout: "f"
+    node_version: ">=6"
+}
+
+issue_4608_2: {
+    options = {
+        arguments: true,
+        reduce_vars: true,
+    }
+    input: {
+        (function(a) {
+            [ arguments ] = [ "foo" ];
+            console.log(arguments[0]);
+        })();
+    }
+    expect: {
+        (function(a) {
+            [ arguments ] = [ "foo" ];
+            console.log(arguments[0]);
+        })();
+    }
+    expect_stdout: "f"
+    node_version: ">=6"
+}

test/compress/drop-unused.js

@@ -4,15 +4,16 @@ unused_funarg_1: {
         unused: true,
     }
     input: {
-        function f(a, b, c, d, e) {
+        console.log(function f(a, b, c, d, e) {
             return a + b;
-        }
+        }(14, 28));
     }
     expect: {
-        function f(a, b) {
+        console.log(function(a, b) {
             return a + b;
-        }
+        }(14, 28));
     }
+    expect_stdout: "42"
 }
 
 unused_funarg_2: {
@@ -21,15 +22,16 @@ unused_funarg_2: {
         unused: true,
     }
     input: {
-        function f(a, b, c, d, e) {
+        console.log(function f(a, b, c, d, e) {
             return a + c;
-        }
+        }(14, 21, 28));
     }
     expect: {
-        function f(a, b, c) {
+        console.log(function(a, c) {
             return a + c;
-        }
+        }(14, 28));
     }
+    expect_stdout: "42"
 }
 
 unused_nested_function: {
@@ -357,37 +359,6 @@ drop_toplevel_vars: {
     }
 }
 
-drop_toplevel_vars_fargs: {
-    options = {
-        keep_fargs: false,
-        toplevel: "vars",
-        unused: true,
-    }
-    input: {
-        var a, b = 1, c = g;
-        function f(d) {
-            return function() {
-                c = 2;
-            };
-        }
-        a = 2;
-        function g() {}
-        function h() {}
-        console.log(b = 3);
-    }
-    expect: {
-        function f() {
-            return function() {
-                2;
-            };
-        }
-        2;
-        function g() {}
-        function h() {}
-        console.log(3);
-    }
-}
-
 drop_toplevel_all: {
     options = {
         toplevel: true,
@@ -625,13 +596,14 @@ drop_fargs: {
         unused: true,
     }
     input: {
-        function f(a) {
+        console.log(function f(a) {
             var b = a;
-        }
+        }());
     }
     expect: {
-        function f() {}
+        console.log(function() {}());
     }
+    expect_stdout: "undefined"
 }
 
 drop_fnames: {
@@ -2027,7 +1999,7 @@ issue_3192_1: {
 
 issue_3192_2: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -2166,6 +2138,7 @@ issue_3497: {
 issue_3515_1: {
     options = {
         collapse_vars: true,
+        evaluate: true,
         reduce_vars: true,
         unused: true,
     }
@@ -2217,6 +2190,7 @@ issue_3515_2: {
 issue_3515_3: {
     options = {
         collapse_vars: true,
+        evaluate: true,
         unused: true,
     }
     input: {
@@ -2284,6 +2258,7 @@ function_assign: {
 issue_3598: {
     options = {
         collapse_vars: true,
+        evaluate: true,
         reduce_vars: true,
         unused: true,
     }
@@ -2435,7 +2410,7 @@ issue_3673: {
 
 issue_3746: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         side_effects: true,
         unused: true,
     }
@@ -2697,8 +2672,7 @@ issue_3956: {
         })();
     }
     expect: {
-        var c, d;
-        c += 0,
+        var d;
         console.log(NaN),
         d = 1 ^ console.log(1),
         console.log(d);
@@ -2713,7 +2687,7 @@ issue_3956: {
 issue_3962_1: {
     options = {
         evaluate: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
         toplevel: true,
         unused: true,
@@ -2731,13 +2705,13 @@ issue_3962_1: {
     }
     expect: {
         var a = 0;
-        a = (function(c) {
+        (function(c) {
             do {
                 console;
                 0..toString();
             } while (0);
             if (c) console.log("PASS");
-        }(1), 0);
+        })(1);
         void 0;
     }
     expect_stdout: "PASS"
@@ -2745,7 +2719,7 @@ issue_3962_1: {
 
 issue_3962_2: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
         side_effects: true,
         toplevel: true,
@@ -2764,13 +2738,13 @@ issue_3962_2: {
     }
     expect: {
         var a = 0;
-        a = (function(c) {
+        (function(c) {
             do {
                 console;
                 0..toString();
             } while (0);
             if (c) console.log("PASS");
-        }(1), 0);
+        })(1);
     }
     expect_stdout: "PASS"
 }
@@ -2827,7 +2801,9 @@ issue_4017: {
         var a = 0;
         console.log(function() {
             c &= 0;
-            var c = (a++, A = a, 0);
+            var c;
+            a++,
+            A = a;
         }());
     }
     expect_stdout: "undefined"
@@ -2948,7 +2924,7 @@ issue_4133: {
 
 issue_4144: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
         unused: true,
     }
@@ -3112,3 +3088,166 @@ issue_4235: {
     }
     expect_stdout: "undefined"
 }
+
+issue_4404: {
+    options = {
+        pure_getters: "strict",
+        unused: true,
+    }
+    input: {
+        function f(a) {
+            arguments[0] = "PASS";
+            console.log(a);
+        }
+        f("FAIL");
+    }
+    expect: {
+        function f(a) {
+            arguments[0] = "PASS";
+            console.log(a);
+        }
+        f("FAIL");
+    }
+    expect_stdout: "PASS"
+}
+
+issue_4413: {
+    options = {
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        console.log(function f(arguments) {
+            var arguments = function() {};
+            return arguments.length;
+        }());
+    }
+    expect: {
+        console.log(function(arguments) {
+            return function() {}.length;
+        }());
+    }
+    expect_stdout: "0"
+}
+
+issue_4464_1: {
+    options = {
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        function f(a) {
+            var a = function() {};
+            return [ arguments, a ];
+        }
+        console.log(typeof f()[1]);
+    }
+    expect: {
+        function f(a) {
+            a = function() {};
+            return [ arguments, a ];
+        }
+        console.log(typeof f()[1]);
+    }
+    expect_stdout: "function"
+}
+
+issue_4464_2: {
+    options = {
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        function f(a) {
+            var a = function() {};
+            return [ arguments, a ];
+        }
+        console.log(typeof f(42)[0][0]);
+    }
+    expect: {
+        function f(a) {
+            a = function() {};
+            return [ arguments, a ];
+        }
+        console.log(typeof f(42)[0][0]);
+    }
+    expect_stdout: "function"
+}
+
+issue_4464_3: {
+    options = {
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function a(a) {
+            var a = function() {};
+            return [ arguments[0], a ];
+        })(42).forEach(function(b) {
+            console.log(typeof b);
+        });
+    }
+    expect: {
+        (function(a) {
+            a = function() {};
+            return [ arguments[0], a ];
+        })(42).forEach(function(b) {
+            console.log(typeof b);
+        });
+    }
+    expect_stdout: [
+        "function",
+        "function",
+    ]
+}
+
+issue_4558_1: {
+    options = {
+        evaluate: true,
+        pure_getters: true,
+        reduce_vars: true,
+        sequences: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = 0;
+        var b = 1, b = c >>>= a;
+        var c = 0;
+        b && 0[a++],
+        console.log(a);
+    }
+    expect: {
+        var a = 0;
+        var b = c >>>= a;
+        var c;
+        b && a++,
+        console.log(a);
+    }
+    expect_stdout: "0"
+}
+
+issue_4558_2: {
+    options = {
+        evaluate: true,
+        ie8: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function() {
+            var a = 1;
+            var b = (a = NaN) || (console.log("PASS"), 2);
+            return a;
+        })();
+    }
+    expect: {
+        (function() {
+            var a;
+            (a = NaN) || console.log("PASS");
+            return a;
+        })();
+    }
+    expect_stdout: "PASS"
+}

test/compress/evaluate.js

@@ -703,6 +703,7 @@ prototype_function: {
         var g = 0();
         var h = 0();
     }
+    expect_stdout: true
 }
 
 call_args: {
@@ -2800,7 +2801,7 @@ operator_in: {
         console.log("PASS" in { });
         console.log("FAIL" in { });
         console.log("toString" in { });
-        console.log(true);
+        console.log("toString" in { toString: 3 });
     }
     expect_stdout: [
         "true",
@@ -3074,3 +3075,104 @@ issue_4271: {
         "PASS",
     ]
 }
+
+issue_4393: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+    }
+    input: {
+        (function f(a) {
+            a = "PASS";
+            console.log(arguments[0]);
+        })("FAIL");
+    }
+    expect: {
+        (function f(a) {
+            a = "PASS";
+            console.log(arguments[0]);
+        })("FAIL");
+    }
+    expect_stdout: "PASS"
+}
+
+issue_4422: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        console.log(function f(a) {
+            a = "FAIL 1";
+            arguments[0] = "PASS";
+            return a;
+        }("FAIL 2"));
+    }
+    expect: {
+        console.log(function(a) {
+            a = "FAIL 1";
+            arguments[0] = "PASS";
+            return a;
+        }("FAIL 2"));
+    }
+    expect_stdout: "PASS"
+}
+
+issue_4480: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        var a = function f(b) {
+            b = "FAIL";
+            arguments[0] = "PASS";
+            var arguments = 0;
+            console.log(b);
+        }(a);
+    }
+    expect: {
+        var a = function(b) {
+            b = "FAIL";
+            arguments[0] = "PASS";
+            var arguments = 0;
+            console.log(b);
+        }(a);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_4552: {
+    options = {
+        evaluate: true,
+        keep_fnames: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = function f(b) {
+            return function() {
+                b++;
+                try {
+                    return b;
+                } catch (e) {}
+            }();
+        }();
+        console.log(a);
+    }
+    expect: {
+        var a = function f(b) {
+            return function() {
+                b++;
+                try {
+                    return b;
+                } catch (e) {}
+            }();
+        }();
+        console.log(a);
+    }
+    expect_stdout: "NaN"
+}

test/compress/exponentiation.js

@@ -0,0 +1,58 @@
+precedence_1: {
+    input: {
+        console.log(-4 ** 3 ** 2);
+    }
+    expect_exact: "console.log((-4)**3**2);"
+    expect_stdout: "-262144"
+    node_version: ">=8"
+}
+
+precedence_2: {
+    input: {
+        console.log(-4 ** (3 ** 2));
+    }
+    expect_exact: "console.log((-4)**3**2);"
+    expect_stdout: "-262144"
+    node_version: ">=8"
+}
+
+precedence_3: {
+    input: {
+        console.log(-(4 ** 3) ** 2);
+    }
+    expect_exact: "console.log((-(4**3))**2);"
+    expect_stdout: "4096"
+    node_version: ">=8"
+}
+
+precedence_4: {
+    input: {
+        console.log((-4 ** 3) ** 2);
+    }
+    expect_exact: "console.log(((-4)**3)**2);"
+    expect_stdout: "4096"
+    node_version: ">=8"
+}
+
+await: {
+    input: {
+        (async a => a * await a ** ++a % a)(2).then(console.log);
+    }
+    expect_exact: "(async a=>a*(await a)**++a%a)(2).then(console.log);"
+    expect_stdout: "1"
+    node_version: ">=8"
+}
+
+evaluate: {
+    options = {
+        evaluate: true,
+    }
+    input: {
+        console.log(1 + 2 ** 3 - 4);
+    }
+    expect: {
+        console.log(5);
+    }
+    expect_stdout: "5"
+    node_version: ">=8"
+}

test/compress/functions.js

@@ -229,7 +229,7 @@ issue_203: {
     }
     expect: {
         var m = {};
-        var fn = Function("n,o", "o.exports=42");
+        var fn = Function("n,o,t", "o.exports=42");
         fn(null, m, m.exports);
         console.log(m.exports);
     }
@@ -2175,7 +2175,7 @@ issue_3016_3: {
     expect: {
         var b = 1;
         do {
-            console.log((a = void 0, a ? "FAIL" : a = "PASS"));
+            console.log((a = void 0, a ? "FAIL" : "PASS"));
         } while (b--);
         var a;
     }
@@ -2208,7 +2208,7 @@ issue_3016_3_ie8: {
     expect: {
         var b = 1;
         do {
-            console.log((a = void 0, a ? "FAIL" : a = "PASS"));
+            console.log((a = void 0, a ? "FAIL" : "PASS"));
         } while (b--);
         var a;
     }
@@ -4230,7 +4230,7 @@ substitute: {
 substitute_add_farg: {
     options = {
         inline: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
     }
     input: {
         function f(g) {
@@ -4411,7 +4411,9 @@ substitute_drop_farg: {
                 return f;
             },
             function() {
-                return f;
+                return function(d, e) {
+                    return f(d, e);
+                };
             },
         ].forEach(function(g) {
             console.log(g()(o), g().call(o, o));
@@ -4594,7 +4596,7 @@ substitute_use_strict: {
 issue_3833: {
     options = {
         inline: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
         toplevel: true,
         unused: true,
@@ -4751,7 +4753,7 @@ issue_4006: {
         dead_code: true,
         evaluate: true,
         inline: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
         sequences: true,
         side_effects: true,
@@ -5132,8 +5134,8 @@ issue_4259: {
         console.log(typeof a);
     }
     expect: {
-        function a() {
-            for (a in a);
+        var a = function b() {
+            for (b in b);
         }
         a();
         console.log(typeof a);
@@ -5223,3 +5225,185 @@ trailing_comma: {
     expect_exact: 'new function(a,b){console.log(b,a)}(42,"PASS");'
     expect_stdout: "PASS 42"
 }
+
+issue_4451: {
+    options = {
+        functions: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = function f() {
+            for (f in "foo")
+                return f;
+        };
+        while (console.log(typeof a()));
+    }
+    expect: {
+        var a = function f() {
+            for (f in "foo")
+                return f;
+        };
+        while (console.log(typeof a()));
+    }
+    expect_stdout: "function"
+}
+
+issue_4471: {
+    options = {
+        inline: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        f(f());
+        function f() {
+            return g();
+        }
+        function g() {
+            {
+                console.log("PASS");
+            }
+        }
+    }
+    expect: {
+        f(g());
+        function f() {
+            return g();
+        }
+        function g() {
+            console.log("PASS");
+        }
+    }
+    expect_stdout: [
+        "PASS",
+        "PASS",
+    ]
+}
+
+issue_4612_1: {
+    options = {
+        evaluate: true,
+        inline: true,
+        reduce_vars: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        console.log(function() {
+            function f() {
+                return g();
+            }
+            function g(a) {
+                return a || f();
+            }
+            return g("PASS");
+        }());
+    }
+    expect: {
+        console.log("PASS");
+    }
+    expect_stdout: "PASS"
+}
+
+issue_4612_2: {
+    options = {
+        evaluate: true,
+        inline: true,
+        reduce_vars: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        console.log(function() {
+            function fn() {
+                return h();
+            }
+            function g() {
+                return fn();
+            }
+            function h(a) {
+                return a || fn();
+            }
+            return h("PASS");
+        }());
+    }
+    expect: {
+        console.log("PASS");
+    }
+    expect_stdout: "PASS"
+}
+
+issue_4612_3: {
+    options = {
+        inline: true,
+        reduce_vars: true,
+    }
+    input: {
+        console.log(typeof function() {
+            return g();
+            function f() {
+                return g;
+            }
+            function g() {
+                {
+                    return f;
+                }
+            }
+        }());
+    }
+    expect: {
+        console.log(typeof function() {
+            return g();
+            function f() {
+                return g;
+            }
+            function g() {
+                return f;
+            }
+        }());
+    }
+    expect_stdout: "function"
+}
+
+issue_4612_4: {
+    options = {
+        booleans: true,
+        evaluate: true,
+        reduce_vars: true,
+    }
+    input: {
+        console.log(function() {
+            function f() {
+                return h();
+            }
+            function g() {
+                {
+                    return h();
+                }
+            }
+            function h() {
+                {
+                    return g();
+                }
+            }
+        }());
+    }
+    expect: {
+        console.log(function() {
+            function f() {
+                return h();
+            }
+            function g() {
+                return h();
+            }
+            function h() {
+                return g();
+            }
+        }());
+    }
+    expect_stdout: "undefined"
+}

test/compress/hoist_vars.js

@@ -89,6 +89,31 @@ sequences_funs: {
     }
 }
 
+catch_var: {
+    options = {
+        dead_code: true,
+        hoist_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = "PASS";
+        try {
+            a;
+        } catch (a) {
+            var a = 0;
+            a;
+        }
+        console.log(a);
+    }
+    expect: {
+        var a = "PASS";
+        console.log(a);
+    }
+    expect_stdout: "PASS"
+}
+
 issue_2295: {
     options = {
         collapse_vars: true,
@@ -109,3 +134,76 @@ issue_2295: {
         }
     }
 }
+
+issue_4487: {
+    options = {
+        functions: true,
+        hoist_vars: true,
+        keep_fnames: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = function f() {
+            var f = console.log(typeof f);
+        };
+        var b = a();
+    }
+    expect: {
+        function a() {
+            var a = console.log(typeof a);
+        }
+        a();
+    }
+    expect_stdout: "undefined"
+}
+
+issue_4489: {
+    options = {
+        collapse_vars: true,
+        evaluate: true,
+        hoist_vars: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        A = 0;
+        var o = !0 || null;
+        for (var k in o);
+        console.log(k);
+    }
+    expect: {
+        !(A = 0);
+        for (var k in true);
+        console.log(k);
+    }
+    expect_stdout: "undefined"
+}
+
+issue_4517: {
+    options = {
+        collapse_vars: true,
+        hoist_vars: true,
+        join_vars: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        console.log(function() {
+            var a = 2;
+            A = a;
+            var b = typeof !1;
+            return A + b;
+        }());
+    }
+    expect: {
+        console.log(function() {
+            var a = 2;
+            A = a;
+            return A + typeof !1;
+        }());
+    }
+    expect_stdout: "2boolean"
+}

test/compress/ie8.js

@@ -2900,3 +2900,22 @@ issue_4250: {
     }
     expect_stdout: "0"
 }
+
+issue_4568: {
+    options = {
+        ie8: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        console.log(typeof f, function(a) {
+            return a.length;
+        }([ function f() {} ]));
+    }
+    expect: {
+        console.log(typeof f, function(a) {
+            return a.length;
+        }([ function f() {} ]));
+    }
+    expect_stdout: "undefined 1"
+}

test/compress/issue-269.js

@@ -17,7 +17,7 @@ issue_269_1: {
     expect: {
         var x = {};
         console.log(
-            x + "", +x, !!x,
+            "" + x, +("" + x), !!x,
             "", 0, false
         );
     }

test/compress/issue-976.js

@@ -63,42 +63,81 @@ eval_unused: {
         unused: true,
     }
     input: {
-        function f1(a, eval, c, d, e) {
-            return a('c') + eval;
-        }
-        function f2(a, b, c, d, e) {
-            return a + eval('c');
-        }
-        function f3(a, eval, c, d, e) {
-            return a + eval('c');
+        function o(k) {
+            return { c: 14 }[k];
         }
+        console.log(function f1(a, eval, c, d, e) {
+            return a("c") + eval;
+        }(o, 28, true));
+        console.log(function f2(a, b, c, d, e) {
+            return a + eval("c");
+        }(14, true, 28));
+        console.log(function f3(a, eval, c, d, e) {
+            return a + eval("c");
+        }(28, o, true));
     }
     expect: {
-        function f1(a, eval) {
-            return a('c') + eval;
-        }
-        function f2(a, b, c, d, e) {
-            return a + eval('c');
-        }
-        function f3(a, eval, c, d, e) {
-            return a + eval('c');
+        function o(k) {
+            return { c: 14 }[k];
         }
+        console.log(function(a, eval) {
+            return a("c") + eval;
+        }(o, 28));
+        console.log(function f2(a, b, c, d, e) {
+            return a + eval("c");
+        }(14, true, 28));
+        console.log(function f3(a, eval, c, d, e) {
+            return a + eval("c");
+        }(28, o, true));
     }
+    expect_stdout: [
+        "42",
+        "42",
+        "42",
+    ]
 }
 
 eval_mangle: {
-    mangle = {
-    };
-    input: {
-        function f1(a, eval, c, d, e) {
-            return a('c') + eval;
-        }
-        function f2(a, b, c, d, e) {
-            return a + eval('c');
-        }
-        function f3(a, eval, c, d, e) {
-            return a + eval('c');
-        }
+    mangle = {}
+    beautify = {
+        beautify: true,
     }
-    expect_exact: 'function f1(n,c,e,a,f){return n("c")+c}function f2(a,b,c,d,e){return a+eval("c")}function f3(a,eval,c,d,e){return a+eval("c")}'
+    input: {
+        function o(k) {
+            return { cc: 14 }[k + "c"];
+        }
+        console.log(function f1(a, eval, c, d, e) {
+            return a("c") + eval;
+        }(o, 28, true));
+        console.log(function f2(a, b, c, d, e) {
+            return a + eval("c");
+        }(14, true, 28));
+        console.log(function f3(a, eval, c, d, e) {
+            return a + eval("c");
+        }(28, o, true));
+    }
+    expect_exact: [
+        "function o(o) {",
+        "    return {",
+        "        cc: 14",
+        '    }[o + "c"];',
+        "}",
+        "",
+        "console.log(function o(c, e, n, r, t) {",
+        '    return c("c") + e;',
+        "}(o, 28, true));",
+        "",
+        "console.log(function f2(a, b, c, d, e) {",
+        '    return a + eval("c");',
+        "}(14, true, 28));",
+        "",
+        "console.log(function f3(a, eval, c, d, e) {",
+        '    return a + eval("c");',
+        "}(28, o, true));",
+    ]
+    expect_stdout: [
+        "42",
+        "42",
+        "42",
+    ]
 }

test/compress/join_vars.js

@@ -790,7 +790,7 @@ issue_3795: {
         dead_code: true,
         evaluate: true,
         join_vars: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         loops: true,
         passes: 2,
         reduce_vars: true,

test/compress/keep_fargs.js

@@ -18,43 +18,6 @@ keep_fargs_false: {
         function j(e) {}
         console.log(h(), i().length, j.length);
     }
-    expect: {
-        console.log(function f() {
-            return f.length;
-        }(), function g() {
-            return g;
-        }().length);
-        function h() {
-            return h.length;
-        }
-        function i() {
-            return i;
-        }
-        function j() {}
-        console.log(h(), i().length, j.length);
-    }
-}
-
-keep_fargs_strict: {
-    options = {
-        keep_fargs: "strict",
-        unused: true,
-    }
-    input: {
-        console.log(function f(a) {
-            return f.length;
-        }(), function g(b) {
-            return g;
-        }().length);
-        function h(c) {
-            return h.length;
-        }
-        function i(d) {
-            return i;
-        }
-        function j(e) {}
-        console.log(h(), i().length, j.length);
-    }
     expect: {
         console.log(function f(a) {
             return f.length;
@@ -117,61 +80,11 @@ keep_fargs_true: {
     ]
 }
 
-replace_index: {
-    options = {
-        arguments: true,
-        evaluate: true,
-        keep_fargs: "strict",
-        properties: true,
-    }
-    input: {
-        var arguments = [];
-        console.log(arguments[0]);
-        (function() {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-        (function(a, b) {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-        (function(arguments) {
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-        (function() {
-            var arguments;
-            console.log(arguments[1], arguments["1"], arguments["foo"]);
-        })("bar", 42);
-    }
-    expect: {
-        var arguments = [];
-        console.log(arguments[0]);
-        (function(argument_0, argument_1) {
-            console.log(argument_1, argument_1, arguments.foo);
-        })("bar", 42);
-        (function(a, b) {
-            console.log(b, b, arguments.foo);
-        })("bar", 42);
-        (function(arguments) {
-            console.log(arguments[1], arguments[1], arguments.foo);
-        })("bar", 42);
-        (function() {
-            var arguments;
-            console.log(arguments[1], arguments[1], arguments.foo);
-        })("bar", 42);
-    }
-    expect_stdout: [
-        "undefined",
-        "42 42 undefined",
-        "42 42 undefined",
-        "a a undefined",
-        "42 42 undefined",
-    ]
-}
-
 replace_index_strict: {
     options = {
         arguments: true,
         evaluate: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         properties: true,
         reduce_vars: true,
     }
@@ -202,7 +115,7 @@ replace_index_strict: {
 issue_1858: {
     options = {
         collapse_vars: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         pure_getters: true,
         unused: true,
     }
@@ -224,7 +137,7 @@ issue_1858: {
 issue_2187_2: {
     options = {
         collapse_vars: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -245,7 +158,7 @@ issue_2187_2: {
 issue_2203_2: {
     options = {
         collapse_vars: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -280,7 +193,7 @@ issue_2203_2: {
 issue_2298: {
     options = {
         collapse_vars: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         passes: 2,
         reduce_funcs: true,
         reduce_vars: true,
@@ -323,7 +236,7 @@ issue_2298: {
 issue_2319_1: {
     options = {
         collapse_vars: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -346,7 +259,7 @@ issue_2319_1: {
 issue_2319_2: {
     options = {
         collapse_vars: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -371,7 +284,7 @@ issue_2319_2: {
 issue_2319_3: {
     options = {
         collapse_vars: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -396,7 +309,7 @@ issue_2319_3: {
 issue_2425_1: {
     options = {
         collapse_vars: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -419,7 +332,7 @@ issue_2425_1: {
 issue_2425_2: {
     options = {
         collapse_vars: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -442,7 +355,7 @@ issue_2425_2: {
 issue_2425_3: {
     options = {
         collapse_vars: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -465,7 +378,7 @@ issue_2425_3: {
 issue_2436_13: {
     options = {
         collapse_vars: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         passes: 2,
         reduce_vars: true,
         unused: true,
@@ -499,7 +412,7 @@ issue_2436_13: {
 issue_2506: {
     options = {
         collapse_vars: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         passes: 2,
         reduce_vars: true,
         unused: true,
@@ -538,7 +451,7 @@ issue_2506: {
 
 issue_2226_1: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         side_effects: true,
         unused: true,
     }
@@ -585,7 +498,7 @@ issue_2226_1: {
 issue_2226_2: {
     options = {
         collapse_vars: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         sequences: true,
         side_effects: true,
         unused: true,
@@ -607,7 +520,7 @@ issue_2226_2: {
 issue_2226_3: {
     options = {
         collapse_vars: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         side_effects: true,
         unused: true,
     }
@@ -627,7 +540,7 @@ issue_2226_3: {
 
 issue_3192: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -657,7 +570,7 @@ issue_3192: {
 if_increment: {
     options = {
         evaluate: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
         unused: true,
     }
@@ -679,7 +592,7 @@ if_increment: {
 try_increment: {
     options = {
         evaluate: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
         unused: true,
     }
@@ -703,7 +616,7 @@ try_increment: {
 issue_2630_3: {
     options = {
         inline: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
         unused: true,
     }
@@ -740,7 +653,7 @@ issue_2630_3: {
 issue_3364: {
     options = {
         functions: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
         toplevel: true,
         unused: true,
@@ -805,7 +718,7 @@ issue_3364: {
 
 defun_label: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         passes: 2,
         reduce_funcs: true,
         reduce_vars: true,
@@ -837,7 +750,7 @@ defun_label: {
 
 iife_func_side_effects: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_funcs: true,
         reduce_vars: true,
         unused: true,
@@ -889,7 +802,7 @@ iife_func_side_effects: {
 issue_1595_1: {
     options = {
         evaluate: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_funcs: true,
         reduce_vars: true,
         unused: true,
@@ -909,7 +822,7 @@ issue_1595_1: {
 issue_1595_2: {
     options = {
         evaluate: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_funcs: true,
         reduce_vars: true,
         unused: true,
@@ -929,7 +842,7 @@ issue_1595_2: {
 issue_1595_3: {
     options = {
         evaluate: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         passes: 2,
         reduce_funcs: true,
         reduce_vars: true,
@@ -950,7 +863,7 @@ issue_1595_3: {
 issue_1595_4: {
     options = {
         evaluate: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_funcs: true,
         reduce_vars: true,
         unused: true,
@@ -972,7 +885,7 @@ issue_1595_4: {
 
 duplicate_lambda_defun_name_1: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
     }
     input: {
@@ -992,7 +905,7 @@ duplicate_lambda_defun_name_1: {
 
 duplicate_lambda_defun_name_2: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         passes: 2,
         reduce_vars: true,
         unused: true,
@@ -1013,7 +926,7 @@ duplicate_lambda_defun_name_2: {
 
 function_name_mangle: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         keep_fnames: true,
         reduce_vars: true,
         unused: true,
@@ -1031,7 +944,7 @@ function_name_mangle: {
 
 function_name_mangle_ie8: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         keep_fnames: true,
         reduce_vars: true,
         unused: true,
@@ -1052,7 +965,7 @@ function_name_mangle_ie8: {
 
 issue_3420_1: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -1075,7 +988,7 @@ issue_3420_1: {
 issue_3420_2: {
     options = {
         inline: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -1096,7 +1009,7 @@ issue_3420_2: {
 issue_3420_3: {
     options = {
         inline: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
         unused: true,
     }
@@ -1118,7 +1031,7 @@ issue_3420_3: {
 
 issue_3423_1: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -1138,7 +1051,7 @@ issue_3423_1: {
 
 issue_3423_2: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -1165,7 +1078,7 @@ collapse_vars_repeated: {
         hoist_funs: true,
         if_return: true,
         join_vars: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         loops: true,
         properties: true,
         reduce_funcs: true,
@@ -1212,7 +1125,7 @@ collapse_vars_repeated: {
 chained_3: {
     options = {
         collapse_vars: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -1236,7 +1149,7 @@ replace_all_var_scope: {
     rename = true
     options = {
         collapse_vars: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     mangle = {}
@@ -1265,7 +1178,7 @@ replace_all_var_scope: {
 
 issue_1583: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         passes: 2,
         reduce_funcs: true,
         reduce_vars: true,
@@ -1302,7 +1215,7 @@ issues_3267_1: {
         dead_code: true,
         evaluate: true,
         inline: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
         sequences: true,
         side_effects: true,
@@ -1331,7 +1244,7 @@ issues_3267_1: {
 
 trailing_argument_side_effects: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -1355,7 +1268,7 @@ trailing_argument_side_effects: {
 
 recursive_iife_1: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
         unused: true,
     }
@@ -1374,7 +1287,7 @@ recursive_iife_1: {
 
 recursive_iife_2: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
         unused: true,
     }
@@ -1455,7 +1368,7 @@ issue_3619: {
 
 issue_4353_1: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
         unused: true,
     }
@@ -1470,7 +1383,7 @@ issue_4353_1: {
 
 issue_4353_2: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
         unused: true,
     }

test/compress/labels.js

@@ -207,3 +207,123 @@ labels_10: {
         }
     }
 }
+
+issue_4466_1: {
+    mangle = {
+        v8: false,
+    }
+    input: {
+        A: if (console.log("PASS"))
+            B:;
+        else
+            C:;
+    }
+    expect: {
+        e: if (console.log("PASS"))
+            l:;
+        else
+            l:;
+    }
+    expect_stdout: "PASS"
+    node_version: ">=12"
+}
+
+issue_4466_1_v8: {
+    mangle = {
+        v8: true,
+    }
+    input: {
+        A: if (console.log("PASS"))
+            B:;
+        else
+            C:;
+    }
+    expect: {
+        e: if (console.log("PASS"))
+            l:;
+        else
+            o:;
+    }
+    expect_stdout: "PASS"
+    node_version: ">=12"
+}
+
+issue_4466_2: {
+    mangle = {
+        toplevel: false,
+        v8: false,
+    }
+    input: {
+        if (console.log("PASS"))
+            A:;
+        else
+            B:;
+    }
+    expect: {
+        if (console.log("PASS"))
+            e:;
+        else
+            e:;
+    }
+    expect_stdout: "PASS"
+}
+
+issue_4466_2_v8: {
+    mangle = {
+        toplevel: false,
+        v8: true,
+    }
+    input: {
+        if (console.log("PASS"))
+            A:;
+        else
+            B:;
+    }
+    expect: {
+        if (console.log("PASS"))
+            e:;
+        else
+            l:;
+    }
+    expect_stdout: "PASS"
+}
+
+issue_4466_2_toplevel: {
+    mangle = {
+        toplevel: true,
+        v8: false,
+    }
+    input: {
+        if (console.log("PASS"))
+            A:;
+        else
+            B:;
+    }
+    expect: {
+        if (console.log("PASS"))
+            e:;
+        else
+            e:;
+    }
+    expect_stdout: "PASS"
+}
+
+issue_4466_2_toplevel_v8: {
+    mangle = {
+        toplevel: true,
+        v8: true,
+    }
+    input: {
+        if (console.log("PASS"))
+            A:;
+        else
+            B:;
+    }
+    expect: {
+        if (console.log("PASS"))
+            e:;
+        else
+            e:;
+    }
+    expect_stdout: "PASS"
+}

test/compress/let.js

@@ -359,6 +359,28 @@ reduce_block_2_toplevel: {
     node_version: ">=4"
 }
 
+reduce_vars: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        "use strict";
+        let a = "PASS";
+        console.log(a);
+        a = "FAIL";
+    }
+    expect: {
+        "use strict";
+        console.log("PASS");
+        "FAIL";
+    }
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
 hoist_props: {
     options = {
         hoist_props: true,
@@ -1228,3 +1250,92 @@ issue_1753_toplevel: {
     expect_stdout: "0"
     node_version: ">=4"
 }
+
+issue_4438: {
+    options = {
+        if_return: true,
+    }
+    input: {
+        "use strict";
+        function f() {
+            if (console) {
+                {
+                    let a = console.log;
+                    return void a("PASS");
+                }
+            }
+        }
+        f();
+    }
+    expect: {
+        "use strict";
+        function f() {
+            if (!console)
+                ;
+            else {
+                let a = console.log;
+                a("PASS");
+            }
+        }
+        f();
+    }
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
+issue_4531_1: {
+    mangle = {
+        ie8: true,
+        toplevel: true,
+    }
+    input: {
+        "use strict";
+        var a;
+        console.log(function a() {
+            let a;
+            var b;
+        }());
+    }
+    expect: {
+        "use strict";
+        var o;
+        console.log(function o() {
+            let o;
+            var t;
+        }());
+    }
+    expect_stdout: "undefined"
+    node_version: ">=4"
+}
+
+issue_4531_2: {
+    options = {
+        evaluate: true,
+        ie8: true,
+        toplevel: true,
+    }
+    mangle = {
+        ie8: true,
+        toplevel: true,
+    }
+    input: {
+        "use strict";
+        var a = console;
+        console.log(typeof a, function a() {
+            let { [console]: a } = 0 && a;
+            var b = console;
+            while (!b);
+        }());
+    }
+    expect: {
+        "use strict";
+        var o = console;
+        console.log(typeof o, function o() {
+            let { [console]: o } = 0;
+            var e = console;
+            while (!e);
+        }());
+    }
+    expect_stdout: "object undefined"
+    node_version: ">=6"
+}

test/compress/loops.js

@@ -1026,7 +1026,7 @@ issue_4075: {
 
 issue_4082: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         loops: true,
         unused: true,
     }
@@ -1050,7 +1050,7 @@ issue_4082: {
 
 issue_4084: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         loops: true,
         passes: 2,
         reduce_vars: true,
@@ -1280,3 +1280,33 @@ issue_4355: {
     }
     expect_stdout: "PASS"
 }
+
+issue_4564: {
+    options = {
+        loops: true,
+        unused: true,
+    }
+    input: {
+        try {
+            throw null;
+        } catch (a) {
+            var a;
+            (function() {
+                for (a in "foo");
+            })();
+            console.log(a);
+        }
+    }
+    expect: {
+        try {
+            throw null;
+        } catch (a) {
+            var a;
+            (function() {
+                for (a in "foo");
+            })();
+            console.log(a);
+        }
+    }
+    expect_stdout: "2"
+}

test/compress/merge_vars.js

@@ -327,7 +327,7 @@ issue_4103: {
 
 issue_4107: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         merge_vars: true,
         reduce_vars: true,
         unused: true,

test/compress/numbers.js

@@ -338,7 +338,7 @@ evaluate_3: {
         console.log(1 + Number(x) + 2);
     }
     expect: {
-        console.log(+x + 3);
+        console.log(+("" + x) + 3);
     }
 }
 
@@ -1386,3 +1386,75 @@ issue_4142: {
     }
     expect_stdout: "0"
 }
+
+issue_4542_1: {
+    options = {
+        evaluate: true,
+        unsafe_math: true,
+    }
+    input: {
+        console.log(function(a) {
+            return a / (1 / (a[0] = 2));
+        }([ 3 ]));
+    }
+    expect: {
+        console.log(function(a) {
+            return a / (1 / (a[0] = 2));
+        }([ 3 ]));
+    }
+    expect_stdout: "4"
+}
+
+issue_4542_2: {
+    options = {
+        evaluate: true,
+        unsafe_math: true,
+    }
+    input: {
+        console.log(function(a) {
+            return a / (1 / --a[0]);
+        }([ 3 ]));
+    }
+    expect: {
+        console.log(function(a) {
+            return a / (1 / --a[0]);
+        }([ 3 ]));
+    }
+    expect_stdout: "4"
+}
+
+issue_4542_3: {
+    options = {
+        evaluate: true,
+        unsafe_math: true,
+    }
+    input: {
+        console.log(function(a) {
+            return a / (0 / (a[0] = 0, 1));
+        }([ 1 ]));
+    }
+    expect: {
+        console.log(function(a) {
+            return a / (0 / (a[0] = 0, 1));
+        }([ 1 ]));
+    }
+    expect_stdout: "NaN"
+}
+
+issue_4542_4: {
+    options = {
+        evaluate: true,
+        unsafe_math: true,
+    }
+    input: {
+        console.log(function(a) {
+            return a / (1 / (a.length = 1));
+        }([ 2, 3 ]));
+    }
+    expect: {
+        console.log(function(a) {
+            return a / (1 / (a.length = 1));
+        }([ 2, 3 ]));
+    }
+    expect_stdout: "2"
+}

test/compress/objects.js

@@ -257,6 +257,29 @@ keep_computed_key: {
     node_version: ">=4"
 }
 
+shorthand_keywords: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        toplevel: true,
+        unsafe: true,
+        unused: true,
+    }
+    input: {
+        var async = 1, get = 2, set = 3, o = {
+            async,
+            get,
+            set,
+        };
+        console.log(o.async, o.get, o.set);
+    }
+    expect: {
+        console.log(1, 2, 3);
+    }
+    expect_stdout: "1 2 3"
+    node_version: ">=6"
+}
+
 issue_4269_1: {
     options = {
         evaluate: true,
@@ -413,3 +436,22 @@ issue_4380: {
     expect_stdout: "PASS"
     node_version: ">=4"
 }
+
+issue_4415: {
+    options = {
+        evaluate: true,
+        objects: true,
+    }
+    input: {
+        console.log({
+            ["00"]: "FAIL",
+        }[0] || "PASS");
+    }
+    expect: {
+        console.log({
+            "00": "FAIL",
+        }[0] || "PASS");
+    }
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}

test/compress/pure_funcs.js

@@ -685,7 +685,7 @@ issue_3858: {
     options = {
         collapse_vars: true,
         inline: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -711,7 +711,7 @@ inline_pure_call_1: {
     options = {
         collapse_vars: true,
         inline: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
         sequences: true,
         side_effects: true,
@@ -733,7 +733,7 @@ inline_pure_call_2: {
     options = {
         collapse_vars: true,
         inline: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
         sequences: true,
         side_effects: true,
@@ -756,7 +756,7 @@ inline_pure_call_3: {
         collapse_vars: true,
         evaluate: true,
         inline: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         passes: 2,
         reduce_vars: true,
         toplevel: true,

test/compress/pure_getters.js

@@ -248,6 +248,35 @@ issue_2110_2: {
     expect_stdout: "function"
 }
 
+issue_2110_3: {
+    options = {
+        collapse_vars: true,
+        pure_getters: "strict",
+        reduce_vars: true,
+    }
+    input: {
+        function g() {
+            return this;
+        }
+        console.log(typeof function() {
+            function f() {}
+            f.g = g;
+            return f.g();
+        }());
+    }
+    expect: {
+        function g() {
+            return this;
+        }
+        console.log(typeof function() {
+            function f() {}
+            f.g = g;
+            return f.g();
+        }());
+    }
+    expect_stdout: "function"
+}
+
 set_immutable_1: {
     options = {
         collapse_vars: true,
@@ -979,6 +1008,7 @@ collapse_vars_2_strict: {
 collapse_rhs_true: {
     options = {
         collapse_vars: true,
+        evaluate: true,
         pure_getters: true,
     }
     input: {
@@ -1015,6 +1045,7 @@ collapse_rhs_true: {
 collapse_rhs_false: {
     options = {
         collapse_vars: true,
+        evaluate: true,
         pure_getters: false,
     }
     input: {
@@ -1051,6 +1082,7 @@ collapse_rhs_false: {
 collapse_rhs_strict: {
     options = {
         collapse_vars: true,
+        evaluate: true,
         pure_getters: "strict",
     }
     input: {
@@ -1087,6 +1119,7 @@ collapse_rhs_strict: {
 collapse_rhs_setter: {
     options = {
         collapse_vars: true,
+        evaluate: true,
         pure_getters: "strict",
     }
     input: {
@@ -1208,3 +1241,32 @@ issue_3427: {
     expect: {}
     expect_stdout: true
 }
+
+issue_4440: {
+    options = {
+        pure_getters: "strict",
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        try {
+            (function() {
+                arguments = null;
+                console.log(arguments.p = "FAIL");
+            })();
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect: {
+        try {
+            (function() {
+                arguments = null;
+                console.log(arguments.p = "FAIL");
+            })();
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect_stdout: "PASS"
+}

test/compress/reduce_vars.js

@@ -2373,7 +2373,7 @@ redefine_farg_1: {
         function f(a) {
             return typeof a;
         }
-        function g() {
+        function g(a) {
             return "number";
         }
         function h(a, b) {
@@ -6928,7 +6928,7 @@ issue_3622: {
     options = {
         evaluate: true,
         inline: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         reduce_vars: true,
         sequences: true,
         toplevel: true,
@@ -7196,7 +7196,7 @@ issue_3894: {
 issue_3922: {
     options = {
         evaluate: true,
-        keep_fargs: "strict",
+        keep_fargs: false,
         pure_getters: "strict",
         reduce_vars: true,
         side_effects: true,
@@ -7601,3 +7601,32 @@ issue_4188_2: {
     }
     expect_stdout: "number undefined"
 }
+
+issue_4568: {
+    options = {
+        booleans: true,
+        conditionals: true,
+        dead_code: true,
+        evaluate: true,
+        loops: true,
+        passes: 2,
+        reduce_vars: true,
+        sequences: true,
+        unused: true,
+    }
+    input: {
+        (function(a) {
+            a && console.log("FAIL");
+            if (1)
+                do {
+                    if (!console.log("PASS")) break;
+                } while (1);
+        })(!(0 !== delete NaN));
+    }
+    expect: {
+        (function(a) {
+            for (a && console.log("FAIL"), 1; console.log("PASS"); ) 1;
+        })(!(0 !== delete NaN));
+    }
+    expect_stdout: "PASS"
+}

test/compress/rests.js

@@ -0,0 +1,698 @@
+arrow_1: {
+    input: {
+        console.log.apply(console, ((...a) => a)("PASS", 42));
+    }
+    expect_exact: 'console.log.apply(console,((...a)=>a)("PASS",42));'
+    expect_stdout: "PASS 42"
+    node_version: ">=6"
+}
+
+arrow_2: {
+    input: {
+        console.log.apply(console, ((a, ...b) => b)("FAIL", "PASS", 42));
+    }
+    expect_exact: 'console.log.apply(console,((a,...b)=>b)("FAIL","PASS",42));'
+    expect_stdout: "PASS 42"
+    node_version: ">=6"
+}
+
+arrow_destructured_array_1: {
+    input: {
+        console.log.apply(console, (([ ...a ]) => a)("PASS"));
+    }
+    expect_exact: 'console.log.apply(console,(([...a])=>a)("PASS"));'
+    expect_stdout: "P A S S"
+    node_version: ">=6"
+}
+
+arrow_destructured_array_2: {
+    input: {
+        console.log.apply(console, (([ a, ...b ]) => b)([ "FAIL", "PASS", 42 ]));
+    }
+    expect_exact: 'console.log.apply(console,(([a,...b])=>b)(["FAIL","PASS",42]));'
+    expect_stdout: "PASS 42"
+    node_version: ">=6"
+}
+
+arrow_destructured_array_3: {
+    input: {
+        console.log((([ [ ...a ] = "FAIL" ]) => a)([ "PASS" ]).join("|"));
+    }
+    expect_exact: 'console.log((([[...a]="FAIL"])=>a)(["PASS"]).join("|"));'
+    expect_stdout: "P|A|S|S"
+    node_version: ">=6"
+}
+
+arrow_destructured_object_1: {
+    input: {
+        var f = ({ ...a }) => a, o = f({ PASS: 42 });
+        for (var k in o)
+            console.log(k, o[k]);
+    }
+    expect_exact: "var f=({...a})=>a,o=f({PASS:42});for(var k in o)console.log(k,o[k]);"
+    expect_stdout: "PASS 42"
+    node_version: ">=8"
+}
+
+arrow_destructured_object_2: {
+    input: {
+        var f = ({ FAIL: a, ...b }) => b, o = f({ PASS: 42, FAIL: null });
+        for (var k in o)
+            console.log(k, o[k]);
+    }
+    expect_exact: "var f=({FAIL:a,...b})=>b,o=f({PASS:42,FAIL:null});for(var k in o)console.log(k,o[k]);"
+    expect_stdout: "PASS 42"
+    node_version: ">=8"
+}
+
+arrow_destructured_object_3: {
+    input: {
+        var f = ([ { ...a } = [ "FAIL" ] ]) => a;
+        var o = f([ "PASS" ]);
+        for (var k in o)
+            console.log(k, o[k]);
+    }
+    expect_exact: 'var f=([{...a}=["FAIL"]])=>a;var o=f(["PASS"]);for(var k in o)console.log(k,o[k]);'
+    expect_stdout: [
+        "0 P",
+        "1 A",
+        "2 S",
+        "3 S",
+    ]
+    node_version: ">=8"
+}
+
+funarg_1: {
+    input: {
+        console.log.apply(console, function(...a) {
+            return a;
+        }("PASS", 42));
+    }
+    expect_exact: 'console.log.apply(console,function(...a){return a}("PASS",42));'
+    expect_stdout: "PASS 42"
+    node_version: ">=6"
+}
+
+funarg_2: {
+    input: {
+        console.log.apply(console, function(a, ...b) {
+            return b;
+        }("FAIL", "PASS", 42));
+    }
+    expect_exact: 'console.log.apply(console,function(a,...b){return b}("FAIL","PASS",42));'
+    expect_stdout: "PASS 42"
+    node_version: ">=6"
+}
+
+destructured_array_1: {
+    input: {
+        var [ ...a ] = [ "PASS", 42 ];
+        console.log.apply(console, a);
+    }
+    expect_exact: 'var[...a]=["PASS",42];console.log.apply(console,a);'
+    expect_stdout: "PASS 42"
+    node_version: ">=6"
+}
+
+destructured_array_2: {
+    input: {
+        var [ a, ...b ] = [ "FAIL", "PASS", 42 ];
+        console.log.apply(console, b);
+    }
+    expect_exact: 'var[a,...b]=["FAIL","PASS",42];console.log.apply(console,b);'
+    expect_stdout: "PASS 42"
+    node_version: ">=6"
+}
+
+destructured_object_1: {
+    input: {
+        var { ...a } = [ "FAIL", "PASS", 42 ];
+        console.log(a[1], a[2]);
+    }
+    expect_exact: 'var{...a}=["FAIL","PASS",42];console.log(a[1],a[2]);'
+    expect_stdout: "PASS 42"
+    node_version: ">=8"
+}
+
+destructured_object_2: {
+    input: {
+        var { 0: a, ...b } = [ "FAIL", "PASS", 42 ];
+        console.log(b[1], b[2]);
+    }
+    expect_exact: 'var{0:a,...b}=["FAIL","PASS",42];console.log(b[1],b[2]);'
+    expect_stdout: "PASS 42"
+    node_version: ">=8"
+}
+
+drop_fargs: {
+    options = {
+        keep_fargs: false,
+        rests: true,
+        unused: true,
+    }
+    input: {
+        console.log(function(a, ...b) {
+            return b[0];
+        }("FAIL", "PASS"));
+    }
+    expect: {
+        console.log(function(b) {
+            return b[0];
+        }([ "PASS" ]));
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+inline: {
+    options = {
+        inline: true,
+        toplevel: true,
+    }
+    input: {
+        console.log(function(a, ...[ b, c ]) {
+            return c + b + a;
+        }("SS", "A", "P"));
+    }
+    expect: {
+        console.log(([ a, ...[ b, c ] ] = [ "SS", "A", "P" ], c + b + a));
+        var a, b, c;
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+retain_var: {
+    options = {
+        unused: true,
+    }
+    input: {
+        var [ ...a ] = [ "PASS" ];
+        console.log(a[0]);
+    }
+    expect: {
+        var [ ...a ] = [ "PASS" ];
+        console.log(a[0]);
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+reduce_destructured_array: {
+    options = {
+        reduce_vars: true,
+        rests: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var [ ...a ] = [ "PASS" ];
+        console.log(a[0]);
+    }
+    expect: {
+        console.log([ "PASS" ][0]);
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+reduce_destructured_object: {
+    options = {
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var { ...a } = [ "PASS" ];
+        console.log(a[0]);
+    }
+    expect: {
+        var { ...a } = [ "PASS" ];
+        console.log(a[0]);
+    }
+    expect_stdout: "PASS"
+    node_version: ">=8"
+}
+
+retain_destructured_array: {
+    options = {
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var [ a, ...b ] = [ "FAIL", "PASS", 42 ];
+        console.log.apply(console, b);
+    }
+    expect: {
+        var [ , ...b ] = [ "FAIL", "PASS", 42 ];
+        console.log.apply(console, b);
+    }
+    expect_stdout: "PASS 42"
+    node_version: ">=6"
+}
+
+retain_destructured_object_1: {
+    options = {
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var { 0: a, ...b } = [ "FAIL", "PASS", 42 ];
+        for (var k in b)
+            console.log(k, b[k]);
+    }
+    expect: {
+        var { 0: a, ...b } = [ "FAIL", "PASS", 42 ];
+        for (var k in b)
+            console.log(k, b[k]);
+    }
+    expect_stdout: [
+        "1 PASS",
+        "2 42",
+    ]
+    node_version: ">=8"
+}
+
+retain_destructured_object_2: {
+    options = {
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var { foo: [ a ], ...b } = { foo: [ "FAIL" ], bar: "PASS", baz: 42 };
+        for (var k in b)
+            console.log(k, b[k]);
+    }
+    expect: {
+        var { foo: [], ...b } = { foo: [ "FAIL" ], bar: "PASS", baz: 42 };
+        for (var k in b)
+            console.log(k, b[k]);
+    }
+    expect_stdout: [
+        "bar PASS",
+        "baz 42",
+    ]
+    node_version: ">=8"
+}
+
+retain_funarg_destructured_array_1: {
+    options = {
+        inline: true,
+        keep_fargs: false,
+        pure_getters: "strict",
+        unused: true,
+    }
+    input: {
+        console.log((([ ...a ]) => a)([ "PASS" ])[0]);
+    }
+    expect: {
+        console.log((([ ...a ]) => a)([ "PASS" ])[0]);
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+retain_funarg_destructured_array_2: {
+    options = {
+        unused: true,
+    }
+    input: {
+        console.log(function([ a, ...b ]) {
+            return b;
+        }("bar")[1]);
+    }
+    expect: {
+        console.log(function([ , ...b ]) {
+            return b;
+        }("bar")[1]);
+    }
+    expect_stdout: "r"
+    node_version: ">=6"
+}
+
+retain_funarg_destructured_object_1: {
+    options = {
+        inline: true,
+        keep_fargs: false,
+        pure_getters: "strict",
+        unused: true,
+    }
+    input: {
+        console.log((({ ...a }) => a)([ "PASS" ])[0]);
+    }
+    expect: {
+        console.log((({ ...a }) => a)([ "PASS" ])[0]);
+    }
+    expect_stdout: "PASS"
+    node_version: ">=8"
+}
+
+retain_funarg_destructured_object_2: {
+    options = {
+        unused: true,
+    }
+    input: {
+        console.log(function({ p: a, ... b }) {
+            return b;
+        }({ p: "FAIL" }).p || "PASS");
+    }
+    expect: {
+        console.log(function({ p: a, ... b }) {
+            return b;
+        }({ p: "FAIL" }).p || "PASS");
+    }
+    expect_stdout: "PASS"
+    node_version: ">=8"
+}
+
+drop_unused_call_args_1: {
+    options = {
+        rests: true,
+        unused: true,
+    }
+    input: {
+        (function(...a) {
+            console.log(a[0]);
+        })(42, console.log("PASS"));
+    }
+    expect: {
+        (function(a) {
+            console.log(a[0]);
+        })([ 42, console.log("PASS") ]);
+    }
+    expect_stdout: [
+        "PASS",
+        "42",
+    ]
+    node_version: ">=6"
+}
+
+drop_unused_call_args_2: {
+    options = {
+        keep_fargs: false,
+        rests: true,
+        unused: true,
+    }
+    input: {
+        console.log(function(a, ...b) {
+            return b;
+        }(console).length);
+    }
+    expect: {
+        console.log(function(b) {
+            return b;
+        }((console, [])).length);
+    }
+    expect_stdout: "0"
+    node_version: ">=6"
+}
+
+merge_funarg: {
+    options = {
+        merge_vars: true,
+    }
+    input: {
+        (function(...a) {
+            var b = a.length;
+            console.log(b);
+        })();
+    }
+    expect: {
+        (function(...b) {
+            var b = b.length;
+            console.log(b);
+        })();
+    }
+    expect_stdout: "0"
+    node_version: ">=6"
+}
+
+merge_funarg_destructured_array: {
+    options = {
+        merge_vars: true,
+    }
+    input: {
+        (function([ ...a ]) {
+            var b = a.length;
+            console.log(b);
+        })([]);
+    }
+    expect: {
+        (function([ ...b ]) {
+            var b = b.length;
+            console.log(b);
+        })([]);
+    }
+    expect_stdout: "0"
+    node_version: ">=6"
+}
+
+merge_funarg_destructured_object: {
+    options = {
+        merge_vars: true,
+    }
+    input: {
+        (function({ ...a }) {
+            var b = a[0];
+            console.log(b);
+        })([ "PASS" ]);
+    }
+    expect: {
+        (function({ ...b }) {
+            var b = b[0];
+            console.log(b);
+        })([ "PASS" ]);
+    }
+    expect_stdout: "PASS"
+    node_version: ">=8"
+}
+
+keep_arguments: {
+    options = {
+        arguments: true,
+        keep_fargs: false,
+    }
+    input: {
+        (function(...[ {} ]) {
+            console.log(arguments[0]);
+        })("PASS");
+    }
+    expect: {
+        (function(...[ {} ]) {
+            console.log(arguments[0]);
+        })("PASS");
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+drop_rest_array: {
+    options = {
+        rests: true,
+    }
+    input: {
+        var [ ...[ a ]] = [ "PASS" ];
+        console.log(a);
+    }
+    expect: {
+        var [ a ] = [ "PASS" ];
+        console.log(a);
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+drop_rest_arrow: {
+    options = {
+        arrows: true,
+        keep_fargs: false,
+        reduce_vars: true,
+        rests: true,
+    }
+    input: {
+        console.log(((...[ a ]) => a)("PASS"));
+    }
+    expect: {
+        console.log((a => a)("PASS"));
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+drop_rest_lambda: {
+    options = {
+        keep_fargs: false,
+        reduce_vars: true,
+        rests: true,
+        toplevel: true,
+    }
+    input: {
+        function f(...[ a ]) {
+            return a;
+        }
+        console.log(f("PASS"), f(42));
+    }
+    expect: {
+        function f(a) {
+            return a;
+        }
+        console.log(f("PASS"), f(42));
+    }
+    expect_stdout: "PASS 42"
+    node_version: ">=6"
+}
+
+issue_4525_1: {
+    options = {
+        arguments: true,
+    }
+    input: {
+        console.log(function(a, ...[]) {
+            a = "FAIL";
+            return arguments[0];
+        }("PASS"));
+    }
+    expect: {
+        console.log(function(a, ...[]) {
+            a = "FAIL";
+            return arguments[0];
+        }("PASS"));
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+issue_4525_2: {
+    options = {
+        unused: true,
+    }
+    input: {
+        console.log(function(a, ...[]) {
+            a = "FAIL";
+            return arguments[0];
+        }("PASS"));
+    }
+    expect: {
+        console.log(function(a, ...[]) {
+            a = "FAIL";
+            return arguments[0];
+        }("PASS"));
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+issue_4538: {
+    options = {
+        rests: true,
+        unused: true,
+    }
+    input: {
+        console.log(typeof function f(...a) {
+            return a.p, f;
+        }()());
+    }
+    expect: {
+        console.log(typeof function f(...a) {
+            return a.p, f;
+        }()());
+    }
+    expect_stdout: "function"
+    node_version: ">=6"
+}
+
+issue_4544_1: {
+    options = {
+        keep_fnames: true,
+        side_effects: true,
+    }
+    input: {
+        try {
+            (function f(...[ {} ]) {})();
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect: {
+        try {
+            [ ...[ {} ] ] = [];
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+issue_4544_2: {
+    options = {
+        keep_fnames: true,
+        side_effects: true,
+    }
+    input: {
+        try {
+            (function f(a, ...[ {} ]) {})([]);
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect: {
+        try {
+            [ , ...[ {} ] ] = [ [] ];
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+issue_4562: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        rests: true,
+        unsafe: true,
+    }
+    input: {
+        console.log((([ ...[ a ] ]) => a)("foo"));
+    }
+    expect: {
+        console.log((([ a ]) => a)("foo"));
+    }
+    expect_stdout: "f"
+    node_version: ">=6"
+}
+
+issue_4575: {
+    options = {
+        collapse_vars: true,
+        ie8: true,
+        reduce_vars: true,
+        rests: true,
+        unused: true,
+    }
+    input: {
+        A = "PASS";
+        (function() {
+            var a = 0, b = a;
+            var c = function a(...b) {
+                A;
+                var d = A;
+                console.log(d, b.length);
+            }();
+        })();
+    }
+    expect: {
+        A = "PASS";
+        (function() {
+            (function(b) {
+                A;
+                var d = A;
+                console.log(d, b.length);
+            })([]);
+        })();
+    }
+    expect_stdout: "PASS 0"
+    node_version: ">=6"
+}

test/compress/sandbox.js

@@ -13,6 +13,23 @@ console_log: {
     ]
 }
 
+console_log_console: {
+    input: {
+        var log = console.log;
+        log(console);
+        log(typeof console.log);
+    }
+    expect: {
+        var log = console.log;
+        log(console);
+        log(typeof console.log);
+    }
+    expect_stdout: [
+        "{ log: 'function(){}' }",
+        "function",
+    ]
+}
+
 typeof_arguments: {
     options = {
         evaluate: true,
@@ -81,6 +98,63 @@ log_global: {
     expect_stdout: "[object global]"
 }
 
+log_nested: {
+    options = {
+        unused: true,
+    }
+    input: {
+        var o = { p: 42 };
+        for (var i = 0; i < 10; i++)
+            o = {
+                p: o,
+                q: function foo() {},
+            };
+        console.log(o);
+    }
+    expect: {
+        var o = { p: 42 };
+        for (var i = 0; i < 10; i++)
+            o = {
+                p: o,
+                q: function() {},
+            };
+        console.log(o);
+    }
+    expect_stdout: true
+}
+
+timers: {
+    options = {
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var count = 0, interval = 1000, duration = 3210;
+        var timer = setInterval(function() {
+            console.log(++count);
+        }, interval);
+        setTimeout(function() {
+            clearInterval(timer);
+        }, duration);
+    }
+    expect: {
+        var count = 0;
+        var timer = setInterval(function() {
+            console.log(++count);
+        }, 1000);
+        setTimeout(function() {
+            clearInterval(timer);
+        }, 3210);
+    }
+    expect_stdout: [
+        "1",
+        "2",
+        "3",
+    ]
+    node_version: ">=0.12"
+}
+
 issue_4054: {
     input: {
         console.log({

test/compress/side_effects.js

@@ -436,7 +436,7 @@ trim_new: {
 
 issue_4325: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         passes: 2,
         pure_getters: "strict",
         reduce_vars: true,

test/compress/spreads.js

@@ -85,6 +85,28 @@ collapse_vars_4: {
     node_version: ">=6"
 }
 
+conditionals_farg: {
+    options = {
+        conditionals: true,
+    }
+    input: {
+        function log(msg) {
+            console.log(msg);
+        }
+        var a = 42, b = [ "PASS" ], c = [ "FAIL" ];
+        a ? log(...b) : log(...c);
+    }
+    expect: {
+        function log(msg) {
+            console.log(msg);
+        }
+        var a = 42, b = [ "PASS" ], c = [ "FAIL" ];
+        log(...a ? b : c);
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
 dont_inline: {
     options = {
         inline: true,
@@ -106,7 +128,7 @@ dont_inline: {
 do_inline: {
     options = {
         inline: true,
-        spread: true,
+        spreads: true,
     }
     input: {
         console.log(function(a) {
@@ -145,7 +167,7 @@ drop_empty_call_1: {
 drop_empty_call_2: {
     options = {
         side_effects: true,
-        spread: true,
+        spreads: true,
     }
     input: {
         (function() {})(...[ console.log("PASS") ]);
@@ -159,7 +181,7 @@ drop_empty_call_2: {
 
 convert_hole: {
     options = {
-        spread: true,
+        spreads: true,
     }
     input: {
         console.log(...[ "PASS", , 42 ]);
@@ -192,7 +214,7 @@ keep_property_access: {
 
 keep_fargs: {
     options = {
-        keep_fargs: "strict",
+        keep_fargs: false,
         unused: true,
     }
     input: {
@@ -253,7 +275,7 @@ reduce_vars_2: {
 convert_setter: {
     options = {
         objects: true,
-        spread: true,
+        spreads: true,
     }
     input: {
         var o = {
@@ -397,7 +419,7 @@ keep_getter_4: {
 keep_accessor: {
     options = {
         objects: true,
-        spread: true,
+        spreads: true,
     }
     input: {
         var o = {
@@ -445,7 +467,7 @@ keep_accessor: {
 object_key_order_1: {
     options = {
         objects: true,
-        spread: true,
+        spreads: true,
     }
     input: {
         var o = {
@@ -475,7 +497,7 @@ object_key_order_1: {
 object_key_order_2: {
     options = {
         objects: true,
-        spread: true,
+        spreads: true,
     }
     input: {
         var o = {
@@ -505,7 +527,7 @@ object_key_order_2: {
 object_key_order_3: {
     options = {
         objects: true,
-        spread: true,
+        spreads: true,
     }
     input: {
         var o = {
@@ -535,7 +557,7 @@ object_key_order_3: {
 object_key_order_4: {
     options = {
         objects: true,
-        spread: true,
+        spreads: true,
     }
     input: {
         var o = {
@@ -565,7 +587,7 @@ object_key_order_4: {
 object_spread_array: {
     options = {
         objects: true,
-        spread: true,
+        spreads: true,
     }
     input: {
         var o = {
@@ -591,7 +613,7 @@ object_spread_array: {
 object_spread_string: {
     options = {
         objects: true,
-        spread: true,
+        spreads: true,
     }
     input: {
         var o = {
@@ -648,7 +670,7 @@ unused_var_side_effects: {
 issue_4329: {
     options = {
         objects: true,
-        spread: true,
+        spreads: true,
     }
     input: {
         console.log({
@@ -727,7 +749,7 @@ issue_4342: {
 issue_4345: {
     options = {
         objects: true,
-        spread: true,
+        spreads: true,
     }
     input: {
         console.log({
@@ -787,7 +809,7 @@ issue_4361: {
 issue_4363: {
     options = {
         objects: true,
-        spread: true,
+        spreads: true,
     }
     input: {
         ({
@@ -804,3 +826,124 @@ issue_4363: {
     expect_stdout: "PASS"
     node_version: ">=8"
 }
+
+issue_4556: {
+    options = {
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        console.log(function() {
+            var a = "" + [ a++ ];
+            var b = [ ...a ];
+        }());
+    }
+    expect: {
+        console.log(function() {
+            var a;
+        }());
+    }
+    expect_stdout: "undefined"
+    node_version: ">=6"
+}
+
+issue_4560_1: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        toplevel: true,
+    }
+    input: {
+        var a = 0;
+        (function(...{
+            [a++]: {},
+        }) {})(2);
+        console.log(a);
+    }
+    expect: {
+        var a = 0;
+        (function(...{
+            [a++]: {},
+        }) {})(2);
+        console.log(a);
+    }
+    expect_stdout: "1"
+    node_version: ">=6"
+}
+
+issue_4560_2: {
+    options = {
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = 0;
+        (function(...{
+            [a++]: {},
+        }) {})(2);
+        console.log(a);
+    }
+    expect: {
+        var a = 0;
+        (function(...{
+            [a++]: {},
+        }) {})(2);
+        console.log(a);
+    }
+    expect_stdout: "1"
+    node_version: ">=6"
+}
+
+issue_4560_3: {
+    options = {
+        collapse_vars: true,
+        reduce_vars: true,
+        toplevel: true,
+    }
+    input: {
+        var a = 0, b;
+        [ ...{
+            [a++]: b,
+        } ] = [ "PASS" ];
+        console.log(b);
+    }
+    expect: {
+        var a = 0, b;
+        [ ...{
+            [a++]: b,
+        } ] = [ "PASS" ];
+        console.log(b);
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+issue_4614: {
+    options = {
+        pure_getters: "strict",
+        side_effects: true,
+    }
+    input: {
+        try {
+            (function(...[]) {
+                var arguments;
+                arguments[0];
+            })();
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect: {
+        try {
+            (function(...[]) {
+                var arguments;
+                arguments[0];
+            })();
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect_stdout: true
+    node_version: ">=6"
+}

test/compress/templates.js

@@ -0,0 +1,285 @@
+simple: {
+    input: {
+        console.log(`foo
+        bar\nbaz`);
+    }
+    expect_exact: "console.log(`foo\n        bar\\nbaz`);"
+    expect_stdout: [
+        "foo",
+        "        bar",
+        "baz",
+    ]
+    node_version: ">=4"
+}
+
+placeholder: {
+    input: {
+        console.log(`foo ${ function(a, b) {
+            return a * b;
+        }(6, 7) }`);
+    }
+    expect_exact: "console.log(`foo ${function(a,b){return a*b}(6,7)}`);"
+    expect_stdout: "foo 42"
+    node_version: ">=4"
+}
+
+nested: {
+    input: {
+        console.log(`P${`A${"S"}`}S`);
+    }
+    expect_exact: 'console.log(`P${`A${"S"}`}S`);'
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
+tagged: {
+    input: {
+        console.log(String.raw`foo\nbar`);
+    }
+    expect_exact: "console.log(String.raw`foo\\nbar`);"
+    expect_stdout: "foo\\nbar"
+    node_version: ">=4"
+}
+
+tagged_chain: {
+    input: {
+        function f(strings) {
+            return strings.join("") || f;
+        }
+        console.log(f```${42}``pass`.toUpperCase());
+    }
+    expect_exact: 'function f(strings){return strings.join("")||f}console.log(f```${42}``pass`.toUpperCase());'
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
+tag_parenthesis_arrow: {
+    input: {
+        console.log((s => s.raw[0])`\tPASS`.slice(2));
+    }
+    expect_exact: "console.log((s=>s.raw[0])`\\tPASS`.slice(2));"
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
+tag_parenthesis_new: {
+    input: {
+        (new function() {
+            return console.log;
+        })`foo`;
+    }
+    expect_exact: "(new function(){return console.log})`foo`;"
+    expect_stdout: true
+    node_version: ">=4"
+}
+
+malformed_escape: {
+    input: {
+        (function(s) {
+            s.forEach((c, i) => console.log(i, c, s.raw[i]));
+            return () => console.log(arguments);
+        })`\uFo${42}`();
+    }
+    expect_exact: "(function(s){s.forEach((c,i)=>console.log(i,c,s.raw[i]));return()=>console.log(arguments)})`\\uFo${42}`();"
+    expect_stdout: true
+    node_version: ">=4"
+}
+
+evaluate: {
+    options = {
+        evaluate: true,
+        templates: false,
+    }
+    input: {
+        console.log(`foo ${ function(a, b) {
+            return a * b;
+        }(6, 7) }`);
+    }
+    expect: {
+        console.log(`foo ${42}`);
+    }
+    expect_stdout: "foo 42"
+    node_version: ">=4"
+}
+
+evaluate_templates: {
+    options = {
+        evaluate: true,
+        templates: true,
+    }
+    input: {
+        console.log(`foo ${ function(a, b) {
+            return a * b;
+        }(6, 7) }`);
+    }
+    expect: {
+        console.log("foo 42");
+    }
+    expect_stdout: "foo 42"
+    node_version: ">=4"
+}
+
+partial_evaluate: {
+    options = {
+        evaluate: true,
+        templates: true,
+    }
+    input: {
+        console.log(`${6 * 7} foo ${console ? `PA` + "SS" : `FA` + `IL`}`);
+    }
+    expect: {
+        console.log(`42 foo ${console ? "PASS" : "FAIL"}`);
+    }
+    expect_stdout: "42 foo PASS"
+    node_version: ">=4"
+}
+
+malformed_evaluate_1: {
+    options = {
+        evaluate: true,
+        templates: true,
+    }
+    input: {
+        console.log(`\67 ${6 * 7}`);
+    }
+    expect: {
+        console.log(`\67 42`);
+    }
+    expect_stdout: true
+    node_version: ">=4"
+}
+
+malformed_evaluate_2: {
+    options = {
+        evaluate: true,
+        templates: true,
+    }
+    input: {
+        console.log(`\u0${0}b${5}`);
+    }
+    expect: {
+        console.log(`\u0${0}b5`);
+    }
+    expect_stdout: true
+    node_version: ">=4"
+}
+
+malformed_evaluate_3: {
+    options = {
+        evaluate: true,
+        templates: true,
+    }
+    input: {
+        console.log(`\u${0}b${5}`);
+    }
+    expect: {
+        console.log(`\u0b5`);
+    }
+    expect_stdout: true
+    node_version: ">=4"
+}
+
+malformed_evaluate_4: {
+    options = {
+        evaluate: true,
+        templates: true,
+        unsafe: true,
+    }
+    input: {
+        console.log(String.raw`\u0${0}b${5}`);
+    }
+    expect: {
+        console.log("\\u00b5");
+    }
+    expect_stdout: "\\u00b5"
+    node_version: ">=8"
+}
+
+unsafe_evaluate: {
+    options = {
+        evaluate: true,
+        templates: true,
+        unsafe: true,
+    }
+    input: {
+        console.log(String.raw`\uFo`);
+    }
+    expect: {
+        console.log("\\uFo");
+    }
+    expect_stdout: "\\uFo"
+    node_version: ">=8"
+}
+
+side_effects: {
+    options = {
+        side_effects: true,
+    }
+    input: {
+        `42`;
+        `${console.log("foo")}`;
+        console.log`\nbar`;
+    }
+    expect: {
+        console.log("foo");
+        console.log`\nbar`;
+    }
+    expect_stdout: true
+    node_version: ">=4"
+}
+
+unsafe_side_effects: {
+    options = {
+        side_effects: true,
+        unsafe: true,
+    }
+    input: {
+        `42`;
+        `${console.log("foo")}`;
+        String.raw`\nbar`;
+    }
+    expect: {
+        console.log("foo");
+    }
+    expect_stdout: "foo"
+    node_version: ">=4"
+}
+
+issue_4604: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        var a = 0, log = console.log;
+        a = "FAIL";
+        (function() {
+            a = "PASS";
+        })``;
+        log(a);
+    }
+    expect: {
+        var a = 0, log = console.log;
+        a = "FAIL";
+        (function() {
+            a = "PASS";
+        })``;
+        log(a);
+    }
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
+issue_4606: {
+    options = {
+        evaluate: true,
+        templates: true,
+    }
+    input: {
+        console.log(`${typeof A} ${"\r"} ${"\\"} ${"`"}`);
+    }
+    expect: {
+        console.log(`${typeof A} \r \\ \``);
+    }
+    expect_stdout: "undefined \r \\ `"
+    node_version: ">=4"
+}

test/input/invalid/destructured_var.js

@@ -0,0 +1,8 @@
+function f() {
+    var { eval } = null;
+}
+
+function g() {
+    "use strict";
+    var { eval } = 42;
+}

test/input/reduce/destructured_assign.js

@@ -0,0 +1,3 @@
+var o = {};
+[ o[1 + .1 + .1] ] = [ 42 ];
+console.log(o[1.2]);

test/input/reduce/destructured_assign.reduced.js

@@ -0,0 +1,17 @@
+// (beautified)
+var o = {};
+
+[ o[1 + .1 + .1] ] = [];
+
+console.log(o);
+// output: { '1.2000000000000002': undefined }
+// 
+// minify: { '1.2': undefined }
+// 
+// options: {
+//   "compress": {
+//     "unsafe_math": true
+//   },
+//   "mangle": false,
+//   "validate": true
+// }

test/input/reduce/destructured_catch.js

@@ -0,0 +1,7 @@
+try {
+    "foo" in 42;
+} catch ({
+    message,
+}) {
+    console.log(message);
+}

test/input/reduce/destructured_catch.reduced.js

@@ -0,0 +1,13 @@
+// (beautified)
+try {
+    1 in 0;
+} catch (message) {
+    console.log(message);
+}
+// output: TypeError: Cannot use 'in' operator to search for '1' in 0
+// 
+// minify: TypeError: Cannot use 'in' operator to search for '0' in 0
+// 
+// options: {
+//   "mangle": false
+// }

test/input/reduce/diff_error.js

@@ -1,5 +1,5 @@
-(function f(a) {
-    do {
-        console.log(f.length);
-    } while (console.log(f += 0));
-})();
+console.log(function(undefined) {
+    return undefined[function() {
+        {}
+    }] || 1 + .1 + .1;
+}(42));

test/input/reduce/diff_error.reduced.js

@@ -1,19 +1,14 @@
 // (beautified)
-(function f(a) {
-    do {
-        console.log(f.length);
-    } while (console.log(f += 0));
-})();
-// output: 1
-// function(){}0
+console.log(function() {
+    return 1 + .1 + .1;
+}());
+// output: 1.2000000000000002
 // 
-// minify: 0
-// function(){}0
+// minify: 1.2
 // 
 // options: {
 //   "compress": {
-//     "keep_fargs": false,
-//     "unsafe": true
+//     "unsafe_math": true
 //   },
 //   "mangle": false
 // }

test/input/reduce/setter.js

@@ -1,8 +1,5 @@
-console.log(function f(a) {
-    ({
-        set p(v) {
-            f++;
-        }
-    });
-    return f.length;
-}());
+({
+    set p(v) {
+        console.log(+v + .1 + .1);
+    }
+}).p = 1;

test/input/reduce/setter.reduced.js

@@ -1,20 +1,16 @@
 // (beautified)
-console.log(function f(a) {
-    ({
-        set p(v) {
-            f++;
-        }
-    });
-    return f.length;
-}());
-// output: 1
+({
+    set p(v) {
+        console.log(1 + .1 + .1);
+    }
+}).p = 0;
+// output: 1.2000000000000002
 // 
-// minify: 0
+// minify: 1.2
 // 
 // options: {
 //   "compress": {
-//     "keep_fargs": false,
-//     "unsafe": true
+//     "unsafe_math": true
 //   },
 //   "mangle": false
 // }

test/jetstream.js

@@ -5,7 +5,7 @@
 
 var site = "https://browserbench.org/JetStream1.1";
 if (typeof phantom == "undefined") {
-    require("../tools/exit");
+    require("../tools/tty");
     var args = process.argv.slice(2);
     var debug = args.indexOf("--debug");
     if (debug < 0) {

test/mocha/bug-report.js

@@ -0,0 +1,40 @@
+var assert = require("assert");
+var exec = require("child_process").exec;
+
+describe("UGLIFY_BUG_REPORT", function() {
+    var env = Object.create(process.env);
+    env.UGLIFY_BUG_REPORT = 1;
+    it("Should generate bug report via API", function(done) {
+        exec('"' + process.argv[0] + '"', { env: env }, function(err, stdout) {
+            if (err) throw err;
+            assert.strictEqual(stdout, [
+                "// UGLIFY_BUG_REPORT",
+                "// <<undefined>>",
+                "",
+                "//-------------------------------------------------------------",
+                "// INPUT CODE",
+                "...---...",
+                "",
+            ].join("\n"));
+            done();
+        }).stdin.end('console.log(require("./").minify("...---...").code);');
+    });
+    it("Should generate bug report via CLI", function(done) {
+        exec('"' + process.argv[0] + '" bin/uglifyjs -mc', { env: env }, function(err, stdout) {
+            if (err) throw err;
+            assert.strictEqual(stdout, [
+                "// UGLIFY_BUG_REPORT",
+                "// {",
+                '//   "mangle": {},',
+                '//   "compress": {}',
+                "// }",
+                "",
+                "//-------------------------------------------------------------",
+                "// STDIN",
+                "...---...",
+                "",
+            ].join("\n"));
+            done();
+        }).stdin.end("...---...");
+    });
+});

test/mocha/cli.js

@@ -56,7 +56,7 @@ describe("bin/uglifyjs", function() {
             "--source-map", [
                 "names=true",
                 "url=inline",
-            ].join(","),
+            ].join(),
         ].join(" "), function(err, stdout) {
             if (err) throw err;
             var expected = [
@@ -84,7 +84,7 @@ describe("bin/uglifyjs", function() {
             "--source-map", [
                 "names=false",
                 "url=inline",
-            ].join(","),
+            ].join(),
         ].join(" "), function(err, stdout) {
             if (err) throw err;
             var expected = [
@@ -171,7 +171,7 @@ describe("bin/uglifyjs", function() {
                 "content=" + mapFile,
                 "includeSources",
                 "url=inline",
-            ].join(","),
+            ].join(),
         ].join(" ");
 
         var child = exec(command, function(err, stdout) {
@@ -573,6 +573,20 @@ describe("bin/uglifyjs", function() {
             done();
         });
     });
+    it("Should throw syntax error (var { eval })", function(done) {
+        var command = uglifyjscmd + " test/input/invalid/destructured_var.js";
+        exec(command, function(err, stdout, stderr) {
+            assert.ok(err);
+            assert.strictEqual(stdout, "");
+            assert.strictEqual(stderr.split(/\n/).slice(0, 4).join("\n"), [
+                "Parse error at test/input/invalid/destructured_var.js:7,10",
+                "    var { eval } = 42;",
+                "          ^",
+                "ERROR: Unexpected eval in strict mode"
+            ].join("\n"));
+            done();
+        });
+    });
     it("Should throw syntax error (else)", function(done) {
         var command = uglifyjscmd + " test/input/invalid/else.js";
         exec(command, function(err, stdout, stderr) {

test/mocha/getter-setter.js

@@ -3,7 +3,7 @@ var UglifyJS = require("../node");
 
 describe("Getters and setters", function() {
     it("Should not accept operator symbols as getter/setter name", function() {
-        var illegalOperators = [
+        [
             "++",
             "--",
             "+",
@@ -42,43 +42,26 @@ describe("Getters and setters", function() {
             "&=",
             "&&",
             "||"
-        ];
-        var generator = function() {
-            var results = [];
-
-            for (var i in illegalOperators) {
-                results.push({
-                    code: "var obj = { get " + illegalOperators[i] + "() { return test; }};",
-                    operator: illegalOperators[i],
-                    method: "get"
-                });
-                results.push({
-                    code: "var obj = { set " + illegalOperators[i] + "(value) { test = value}};",
-                    operator: illegalOperators[i],
-                    method: "set"
-                });
-            }
-
-            return results;
-        };
-        var testCase = function(data) {
-            return function() {
-                UglifyJS.parse(data.code);
-            };
-        };
-        var fail = function(data) {
-            return function(e) {
+        ].reduce(function(tests, illegalOperator) {
+            tests.push({
+                code: "var obj = { get " + illegalOperator + "() { return test; }};",
+                operator: illegalOperator,
+            });
+            tests.push({
+                code: "var obj = { set " + illegalOperator + "(value) { test = value; }};",
+                operator: illegalOperator,
+            });
+            return tests;
+        }, []).forEach(function(test) {
+            assert.throws(function() {
+                UglifyJS.parse(test.code);
+            }, test.operator == "=" ? function(e) {
                 return e instanceof UglifyJS.JS_Parse_Error
-                    && e.message === "Unexpected token: operator «" + data.operator + "»";
-            };
-        };
-        var errorMessage = function(data) {
-            return "Expected but didn't get a syntax error while parsing following line:\n" + data.code;
-        };
-        var tests = generator();
-        for (var i = 0; i < tests.length; i++) {
-            var test = tests[i];
-            assert.throws(testCase(test), fail(test), errorMessage(test));
-        }
+                    && /^Unexpected token: punc «{», expected: punc «.*?»$/.test(e.message);
+            } : function(e) {
+                return e instanceof UglifyJS.JS_Parse_Error
+                    && e.message === "Unexpected token: operator «" + test.operator + "»";
+            }, "Expected but didn't get a syntax error while parsing following line:\n" + test.code);
+        });
     });
 });

test/mocha/number-literal.js

@@ -89,4 +89,13 @@ describe("Number literals", function() {
             }, code);
         });
     });
+    it("Should reject invalid syntax under expression=true", function() {
+        assert.throws(function() {
+            UglifyJS.parse("42.g", {
+                expression: true,
+            });
+        }, function(e) {
+            return e instanceof UglifyJS.JS_Parse_Error;
+        });
+    });
 });

test/mocha/reduce.js

@@ -37,8 +37,7 @@ describe("test/reduce.js", function() {
     it("Should retain setter arguments", function() {
         var result = reduce_test(read("test/input/reduce/setter.js"), {
             compress: {
-                keep_fargs: false,
-                unsafe: true,
+                unsafe_math: true,
             },
             mangle: false,
         }, {
@@ -110,28 +109,24 @@ describe("test/reduce.js", function() {
     });
     it("Should print correct output for irreducible test case", function() {
         var result = reduce_test([
-            "console.log(function f(a) {",
-            "    return f.length;",
-            "}());",
+            "console.log(1 + .1 + .1);",
         ].join("\n"), {
             compress: {
-                keep_fargs: false,
+                unsafe_math: true,
             },
             mangle: false,
         });
         if (result.error) throw result.error;
         assert.strictEqual(result.code, [
             "// (beautified)",
-            "console.log(function f(a) {",
-            "    return f.length;",
-            "}());",
-            "// output: 1",
+            "console.log(1 + .1 + .1);",
+            "// output: 1.2000000000000002",
             "// ",
-            "// minify: 0",
+            "// minify: 1.2",
             "// ",
             "// options: {",
             '//   "compress": {',
-            '//     "keep_fargs": false',
+            '//     "unsafe_math": true',
             "//   },",
             '//   "mangle": false',
             "// }",
@@ -303,8 +298,7 @@ describe("test/reduce.js", function() {
         if (semver.satisfies(process.version, "<=0.10")) return;
         var result = reduce_test(read("test/input/reduce/diff_error.js"), {
             compress: {
-                keep_fargs: false,
-                unsafe: true,
+                unsafe_math: true,
             },
             mangle: false,
         }, {
@@ -313,4 +307,24 @@ describe("test/reduce.js", function() {
         if (result.error) throw result.error;
         assert.strictEqual(result.code, read("test/input/reduce/diff_error.reduced.js"));
     });
+    it("Should maintain valid LHS in destructuring assignments", function() {
+        if (semver.satisfies(process.version, "<6")) return;
+        var result = reduce_test(read("test/input/reduce/destructured_assign.js"), {
+            compress: {
+                unsafe_math: true,
+            },
+            mangle: false,
+            validate: true,
+        });
+        if (result.error) throw result.error;
+        assert.strictEqual(result.code, read("test/input/reduce/destructured_assign.reduced.js"));
+    });
+    it("Should handle destructured catch expressions", function() {
+        if (semver.satisfies(process.version, "<6")) return;
+        var result = reduce_test(read("test/input/reduce/destructured_catch.js"), {
+            mangle: false,
+        });
+        if (result.error) throw result.error;
+        assert.strictEqual(result.code, read("test/input/reduce/destructured_catch.reduced.js"));
+    });
 });

test/mocha/sourcemaps.js

@@ -244,6 +244,39 @@ describe("sourcemaps", function() {
             assert.strictEqual(result.code, '(function(){console.log("hello")}).call(this);');
             assert.strictEqual(result.map, '{"version":3,"sources":["main.coffee"],"names":["console","log"],"mappings":"CAAA,WAAAA,QAAQC,IAAI"}');
         });
+        it("Should not overwrite existing sourcesContent", function() {
+            var result = UglifyJS.minify({
+                "in.js": [
+                    '"use strict";',
+                    "",
+                    "var _window$foo = window.foo,",
+                    "    a = _window$foo[0],",
+                    "    b = _window$foo[1];",
+                ].join("\n"),
+            }, {
+                compress: false,
+                mangle: false,
+                sourceMap: {
+                    content: {
+                        version: 3,
+                        sources: [ "in.js" ],
+                        names: [
+                            "window",
+                            "foo",
+                            "a",
+                            "b",
+                        ],
+                        mappings: ";;kBAAaA,MAAM,CAACC,G;IAAfC,C;IAAGC,C",
+                        file: "in.js",
+                        sourcesContent: [ "let [a, b] = window.foo;\n" ],
+                    },
+                    includeSources: true,
+                },
+            });
+            if (result.error) throw result.error;
+            assert.strictEqual(result.code, '"use strict";var _window$foo=window.foo,a=_window$foo[0],b=_window$foo[1];');
+            assert.strictEqual(result.map, '{"version":3,"sources":["in.js"],"sourcesContent":["let [a, b] = window.foo;\\n"],"names":["window","foo","a","b"],"mappings":"6BAAaA,OAAOC,IAAfC,E,eAAGC,E"}');
+        });
     });
 
     describe("sourceMapInline", function() {

test/mocha/string-literal.js

@@ -115,8 +115,8 @@ describe("String literals", function() {
                 UglifyJS.parse(test);
             }, function(e) {
                 return e instanceof UglifyJS.JS_Parse_Error
-                    && e.message === "Invalid hex-character pattern in string";
-            });
+                    && /^Invalid escape sequence: \\u/.test(e.message);
+            }, test);
         });
     });
     it("Should reject invalid code points in Unicode escape sequence", function() {
@@ -130,8 +130,8 @@ describe("String literals", function() {
                 UglifyJS.parse(test);
             }, function(e) {
                 return e instanceof UglifyJS.JS_Parse_Error
-                    && /^Invalid character code: /.test(e.message);
-            });
+                    && /^Invalid escape sequence: \\u{1/.test(e.message);
+            }, test);
         });
     });
 });

test/mocha/templates.js

@@ -0,0 +1,67 @@
+var assert = require("assert");
+var run_code = require("../sandbox").run_code;
+var semver = require("semver");
+var UglifyJS = require("../node");
+
+describe("Template literals", function() {
+    it("Should reject invalid literal", function() {
+        [
+            "`foo\\`",
+            "`foo${bar`",
+            "`foo${bar}",
+        ].forEach(function(input) {
+            assert.throws(function() {
+                UglifyJS.parse(input);
+            }, function(e) {
+                return e instanceof UglifyJS.JS_Parse_Error
+                    && e.message === "Unterminated template literal";
+            }, input);
+        });
+    });
+    it("Should reject invalid expression", function() {
+        [
+            "`foo${bar;}`",
+            "`foo${42bar}`",
+        ].forEach(function(input) {
+            assert.throws(function() {
+                UglifyJS.parse(input);
+            }, function(e) {
+                return e instanceof UglifyJS.JS_Parse_Error;
+            }, input);
+        });
+    });
+    it("Should process line-break characters correctly", function() {
+        [
+            // native line breaks
+            [ "`foo\nbar`", "`foo\nbar`" ],
+            [ "`foo\rbar`", "`foo\rbar`" ],
+            [ "`foo\r\nbar`", "`foo\nbar`" ],
+            [ "`foo\r\n\rbar`", "`foo\n\rbar`" ],
+            // escaped line breaks
+            [ "`foo\\nbar`", "`foo\\nbar`" ],
+            [ "`foo\\rbar`", "`foo\\rbar`" ],
+            [ "`foo\r\\nbar`", "`foo\r\\nbar`" ],
+            [ "`foo\\r\nbar`", "`foo\\r\nbar`" ],
+            [ "`foo\\r\\nbar`", "`foo\\r\\nbar`" ],
+            // continuation
+            [ "`foo\\\nbar`", "`foo\\\nbar`" ],
+            [ "`foo\\\rbar`", "`foo\\\rbar`" ],
+            [ "`foo\\\r\nbar`", "`foo\\\nbar`" ],
+            [ "`foo\\\r\n\rbar`", "`foo\\\n\rbar`" ],
+            [ "`foo\\\\nbar`", "`foo\\\\nbar`" ],
+            [ "`foo\\\\rbar`", "`foo\\\\rbar`" ],
+            [ "`foo\\\\r\nbar`", "`foo\\\\r\nbar`" ],
+        ].forEach(function(test) {
+            var input = "console.log(" + test[0] + ");";
+            var result = UglifyJS.minify(input, {
+                compress: false,
+                mangle: false,
+            });
+            if (result.error) throw result.error;
+            var expected = "console.log(" + test[1] + ");";
+            assert.strictEqual(result.code, expected, test[0]);
+            if (semver.satisfies(process.version, "<4")) return;
+            assert.strictEqual(run_code(result.code), run_code(input), test[0]);
+        });
+    });
+});

test/reduce.js

@@ -70,8 +70,8 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
     } else if (differs.error) {
         differs.warnings = warnings;
         return differs;
-    } else if (is_error(differs.unminified_result)
-        && is_error(differs.minified_result)
+    } else if (sandbox.is_error(differs.unminified_result)
+        && sandbox.is_error(differs.minified_result)
         && differs.unminified_result.name == differs.minified_result.name) {
         return {
             code: [
@@ -104,15 +104,14 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
 
             // quick ignores
             if (node instanceof U.AST_Accessor) return;
-            if (node instanceof U.AST_Destructured) return;
             if (node instanceof U.AST_Directive) return;
             if (!in_list && node instanceof U.AST_EmptyStatement) return;
             if (node instanceof U.AST_Label) return;
             if (node instanceof U.AST_LabelRef) return;
-            if (!in_list && node instanceof U.AST_SymbolDeclaration) return;
             if (node instanceof U.AST_Toplevel) return;
             var parent = tt.parent();
             if (node instanceof U.AST_SymbolFunarg && parent instanceof U.AST_Accessor) return;
+            if (!in_list && parent.rest !== node && node instanceof U.AST_SymbolDeclaration) return;
 
             // ensure that the _permute prop is a number.
             // can not use `node.start._permute |= 0;` as it will erase fractional part.
@@ -124,7 +123,7 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
 
             // ignore lvalues
             if (parent instanceof U.AST_Assign && parent.left === node) return;
-            if (parent instanceof U.AST_DestructuredArray) return;
+            if (parent instanceof U.AST_DefaultValue && parent.name === node) return;
             if (parent instanceof U.AST_DestructuredKeyVal && parent.value === node) return;
             if (parent instanceof U.AST_Unary && parent.expression === node) switch (parent.operator) {
               case "++":
@@ -153,6 +152,20 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
                     node.left,
                     node.right,
                 ][ permute & 1 ];
+                if (expr instanceof U.AST_Destructured) expr = expr.transform(new U.TreeTransformer(function(node, descend) {
+                    if (node instanceof U.AST_DefaultValue) return new U.AST_Assign({
+                        operator: "=",
+                        left: node.name.transform(this),
+                        right: node.value,
+                        start: {},
+                    });
+                    if (node instanceof U.AST_DestructuredKeyVal) return new U.AST_ObjectKeyVal(node);
+                    if (node instanceof U.AST_Destructured) {
+                        node = new (node instanceof U.AST_DestructuredArray ? U.AST_Array : U.AST_Object)(node);
+                        descend(node, this);
+                    }
+                    return node;
+                }));
                 CHANGED = true;
                 return permute < 2 ? expr : wrap_with_console_log(expr);
             }
@@ -175,6 +188,12 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
                     CHANGED = true;
                     return expr instanceof U.AST_Spread ? expr.expression : expr;
                 }
+                if (node.expression instanceof U.AST_Arrow && node.expression.value) {
+                    var seq = node.args.slice();
+                    seq.push(node.expression.value);
+                    CHANGED = true;
+                    return to_sequence(seq);
+                }
                 if (node.expression instanceof U.AST_Function) {
                     // hoist and return expressions from the IIFE function expression
                     var body = node.expression.body;
@@ -205,6 +224,28 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
                     node.alternative,
                 ][ ((node.start._permute += step) * steps | 0) % 3 ];
             }
+            else if (node instanceof U.AST_DefaultValue) {
+                node.start._permute++;
+                CHANGED = true;
+                return node.name;
+            }
+            else if (node instanceof U.AST_DestructuredArray) {
+                var expr = node.elements[0];
+                if (expr && !(expr instanceof U.AST_Hole)) {
+                    node.start._permute++;
+                    CHANGED = true;
+                    return expr;
+                }
+            }
+            else if (node instanceof U.AST_DestructuredObject) {
+                // first property's value
+                var expr = node.properties[0];
+                if (expr) {
+                    node.start._permute++;
+                    CHANGED = true;
+                    return expr.value;
+                }
+            }
             else if (node instanceof U.AST_Defun) {
                 switch (((node.start._permute += step) * steps | 0) % 2) {
                   case 0:
@@ -298,7 +339,16 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
             }
             else if (node instanceof U.AST_Object) {
                 // first property's value
-                var expr = node.properties[0] instanceof U.AST_ObjectKeyVal && node.properties[0].value;
+                var expr = node.properties[0];
+                if (expr instanceof U.AST_ObjectKeyVal) {
+                    expr = expr.value;
+                } else if (expr instanceof U.AST_Spread) {
+                    expr = expr.expression;
+                } else if (expr && expr.key instanceof U.AST_Node) {
+                    expr = expr.key;
+                } else {
+                    expr = null;
+                }
                 if (expr) {
                     node.start._permute++;
                     CHANGED = true;
@@ -308,7 +358,7 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
             else if (node instanceof U.AST_PropAccess) {
                 var expr = [
                     node.expression,
-                    node.property instanceof U.AST_Node && node.property,
+                    node.property instanceof U.AST_Node && !(parent instanceof U.AST_Destructured) && node.property,
                 ][ node.start._permute++ % 2 ];
                 if (expr) {
                     CHANGED = true;
@@ -410,15 +460,10 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
                     CHANGED = true;
                     return List.skip;
                 }
-
-                // skip element/property from (destructured) array/object
-                if (parent instanceof U.AST_Array
-                    || parent instanceof U.AST_Destructured
-                    || parent instanceof U.AST_Object) {
-                    node.start._permute++;
-                    CHANGED = true;
-                    return List.skip;
-                }
+            } else if (parent.rest === node) {
+                node.start._permute++;
+                CHANGED = true;
+                return null;
             }
 
             // replace this node
@@ -459,7 +504,7 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
                     if (node.TYPE == "Call" && node.expression.print_to_string() == "console.log") {
                         return to_sequence(node.args);
                     }
-                    if (node instanceof U.AST_Catch && node.argname) {
+                    if (node instanceof U.AST_Catch && node.argname instanceof U.AST_SymbolCatch) {
                         descend(node, this);
                         node.body.unshift(new U.AST_SimpleStatement({
                             body: wrap_with_console_log(new U.AST_SymbolRef(node.argname)),
@@ -513,8 +558,8 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
                         log(code);
                         log(diff.error.stack);
                         log("*** Discarding permutation and continuing.");
-                    } else if (is_error(diff.unminified_result)
-                        && is_error(diff.minified_result)
+                    } else if (sandbox.is_error(diff.unminified_result)
+                        && sandbox.is_error(diff.minified_result)
                         && diff.unminified_result.name == diff.minified_result.name) {
                         // ignore difference in error messages caused by minification
                         diff_error_message = testcase;
@@ -555,10 +600,10 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
         }
         var lines = [ "" ];
         if (isNaN(max_timeout)) {
-            lines.push("// minify error: " + to_comment(strip_color_codes(differs.minified_result.stack)));
+            lines.push("// minify error: " + to_comment(differs.minified_result.stack));
         } else {
-            var unminified_result = strip_color_codes(differs.unminified_result);
-            var minified_result = strip_color_codes(differs.minified_result);
+            var unminified_result = differs.unminified_result;
+            var minified_result = differs.minified_result;
             if (trim_trailing_whitespace(unminified_result) == trim_trailing_whitespace(minified_result)) {
                 lines.push(
                     "// (stringified)",
@@ -579,10 +624,6 @@ module.exports = function reduce_test(testcase, minify_options, reduce_options)
     }
 };
 
-function strip_color_codes(value) {
-    return ("" + value).replace(/\u001b\[\d+m/g, "");
-}
-
 function to_comment(value) {
     return ("" + value).replace(/\n/g, "\n// ");
 }
@@ -620,16 +661,16 @@ function has_loopcontrol(body, loop, label) {
     return found;
 }
 
-function is_error(result) {
-    return typeof result == "object" && typeof result.name == "string" && typeof result.message == "string";
-}
-
 function is_timed_out(result) {
-    return is_error(result) && /timed out/.test(result.message);
+    return sandbox.is_error(result) && /timed out/.test(result.message);
 }
 
 function is_statement(node) {
-    return node instanceof U.AST_Statement && !(node instanceof U.AST_AsyncFunction || node instanceof U.AST_Function);
+    return node instanceof U.AST_Statement
+        && !(node instanceof U.AST_Arrow
+            || node instanceof U.AST_AsyncArrow
+            || node instanceof U.AST_AsyncFunction
+            || node instanceof U.AST_Function);
 }
 
 function merge_sequence(array, node) {

test/sandbox.js

@@ -1,93 +1,39 @@
+var readFileSync = require("fs").readFileSync;
 var semver = require("semver");
+var spawnSync = require("child_process").spawnSync;
 var vm = require("vm");
 
-var setupContext = new vm.Script([
-    "[ Array, Boolean, Error, Function, Number, Object, RegExp, String ].forEach(function(f) {",
-    "    f.toString = Function.prototype.toString;",
-    "});",
-    "Function.prototype.toString = function() {",
-    "    var id = 100000;",
-    "    return function() {",
-    "        var n = this.name;",
-    "        if (!/^F[0-9]{6}N$/.test(n)) {",
-    '            n = "F" + ++id + "N";',
-].concat(Object.getOwnPropertyDescriptor(Function.prototype, "name").configurable ? [
-    '            Object.defineProperty(this, "name", {',
-    "                get: function() {",
-    "                    return n;",
-    "                }",
-    "            });",
-] : [], [
-    "        }",
-    '        return "function(){}";',
-    "    };",
-    "}();",
-    "this;",
-]).join("\n"));
-
-function createContext() {
-    var ctx = vm.createContext(Object.defineProperties({}, {
-        console: { value: { log: log } },
-        global: { get: self },
-        self: { get: self },
-        window: { get: self },
-    }));
-    var global = setupContext.runInContext(ctx);
-    return ctx;
-
-    function self() {
-        return this;
-    }
-
-    function safe_log(arg, level) {
-        if (arg) switch (typeof arg) {
-          case "function":
-            return arg.toString();
-          case "object":
-            if (arg === global) return "[object global]";
-            if (/Error$/.test(arg.name)) return arg.toString();
-            if (typeof arg.then == "function") return "[object Promise]";
-            arg.constructor.toString();
-            if (level--) for (var key in arg) {
-                var desc = Object.getOwnPropertyDescriptor(arg, key);
-                if (!desc || !desc.get && !desc.set) arg[key] = safe_log(arg[key], level);
-            }
-        }
-        return arg;
-    }
-
-    function log(msg) {
-        if (arguments.length == 1 && typeof msg == "string") return console.log("%s", msg);
-        return console.log.apply(console, [].map.call(arguments, function(arg) {
-            return safe_log(arg, 3);
-        }));
-    }
-}
-
-exports.run_code = function(code, toplevel, timeout) {
-    timeout = timeout || 5000;
-    var stdout = "";
-    var original_write = process.stdout.write;
-    process.stdout.write = function(chunk) {
-        stdout += chunk;
-    };
-    try {
-        vm.runInContext(toplevel ? "(function(){" + code + "})()" : code, createContext(), { timeout: timeout });
-        return stdout;
-    } catch (ex) {
-        return ex;
-    } finally {
-        process.stdout.write = original_write;
+setup_log();
+var setup_code = "(" + setup + ")(" + [
+    "this",
+    find_builtins(),
+    setup_log,
+    "function(process) {" + readFileSync(require.resolve("../tools/tty", "utf8")) + "}",
+].join(",\n") + ");\n";
+exports.has_toplevel = function(options) {
+    return options.toplevel
+        || options.mangle && options.mangle.toplevel
+        || options.compress && options.compress.toplevel;
+};
+exports.is_error = is_error;
+exports.run_code = semver.satisfies(process.version, "0.8") ? function(code, toplevel, timeout) {
+    var stdout = run_code_vm(code, toplevel, timeout);
+    if (typeof stdout != "string" || !/arguments/.test(code)) return stdout;
+    do {
+        var prev = stdout;
+        stdout = run_code_vm(code, toplevel, timeout);
+    } while (prev !== stdout);
+    return stdout;
+} : semver.satisfies(process.version, "<0.12") ? run_code_vm : function(code, toplevel, timeout) {
+    if (/\basync([ \t]+[^\s()[\]{},.&|!~=*%/+-]+|[ \t]*\([\s\S]*?\))[ \t]*=>|\b(async[ \t]+function|setInterval|setTimeout)\b/.test(code)) {
+        return run_code_exec(code, toplevel, timeout);
+    } else {
+        return run_code_vm(code, toplevel, timeout);
     }
 };
-
-function strip_func_ids(text) {
-    return ("" + text).replace(/F[0-9]{6}N/g, "<F<>N>");
-}
-
 exports.same_stdout = semver.satisfies(process.version, "0.12") ? function(expected, actual) {
     if (typeof expected != typeof actual) return false;
-    if (typeof expected == "object" && typeof expected.name == "string" && typeof expected.message == "string") {
+    if (is_error(expected)) {
         if (expected.name !== actual.name) return false;
         if (typeof actual.message != "string") return false;
         expected = expected.message.slice(expected.message.lastIndexOf("\n") + 1);
@@ -97,8 +43,228 @@ exports.same_stdout = semver.satisfies(process.version, "0.12") ? function(expec
 } : function(expected, actual) {
     return typeof expected == typeof actual && strip_func_ids(expected) == strip_func_ids(actual);
 };
-exports.has_toplevel = function(options) {
-    return options.toplevel
-        || options.mangle && options.mangle.toplevel
-        || options.compress && options.compress.toplevel;
-};
+
+function is_error(result) {
+    return result && typeof result.name == "string" && typeof result.message == "string";
+}
+
+function strip_color_codes(value) {
+    return value.replace(/\u001b\[\d+m/g, "");
+}
+
+function strip_func_ids(text) {
+    return ("" + text).replace(/F[0-9]{6}N/g, "<F<>N>");
+}
+
+function setup_log() {
+    var inspect = require("util").inspect;
+    if (inspect.defaultOptions) {
+        var log_options = {
+            breakLength: Infinity,
+            colors: false,
+            compact: true,
+            customInspect: false,
+            depth: Infinity,
+            maxArrayLength: Infinity,
+            maxStringLength: Infinity,
+            showHidden: false,
+        };
+        for (var name in log_options) {
+            if (name in inspect.defaultOptions) inspect.defaultOptions[name] = log_options[name];
+        }
+    }
+    return inspect;
+}
+
+function find_builtins() {
+    setup_code = "console.log(Object.keys(this));";
+    var builtins = run_code_vm("");
+    if (semver.satisfies(process.version, ">=0.12")) builtins += ".concat(" + run_code_exec("") + ")";
+    return builtins;
+}
+
+function setup(global, builtins, setup_log, setup_tty) {
+    [ Array, Boolean, Error, Function, Number, Object, RegExp, String ].forEach(function(f) {
+        f.toString = Function.prototype.toString;
+    });
+    Function.prototype.toString = function() {
+        var configurable = Object.getOwnPropertyDescriptor(Function.prototype, "name").configurable;
+        var id = 100000;
+        return function() {
+            var n = this.name;
+            if (!/^F[0-9]{6}N$/.test(n)) {
+                n = "F" + ++id + "N";
+                if (configurable) Object.defineProperty(this, "name", {
+                    get: function() {
+                        return n;
+                    }
+                });
+            }
+            return "function(){}";
+        };
+    }();
+    var process = global.process;
+    if (process) {
+        setup_tty(process);
+        var inspect = setup_log();
+        process.on("uncaughtException", function(ex) {
+            var value = ex;
+            if (value instanceof Error) {
+                value = {};
+                for (var name in ex) {
+                    value[name] = ex[name];
+                    delete ex[name];
+                }
+            }
+            process.stderr.write(inspect(value) + "\n\n-----===== UNCAUGHT EXCEPTION =====-----\n\n");
+            throw ex;
+        }).on("unhandledRejection", function() {});
+    }
+    var log = console.log;
+    var safe_console = {
+        log: function(msg) {
+            if (arguments.length == 1 && typeof msg == "string") return log("%s", msg);
+            return log.apply(null, [].map.call(arguments, function(arg) {
+                return safe_log(arg, {
+                    level: 5,
+                    original: [],
+                    replaced: [],
+                });
+            }));
+        },
+    };
+    var props = {
+        // for Node.js v8
+        console: {
+            get: function() {
+                return safe_console;
+            },
+        },
+        global: { get: self },
+        self: { get: self },
+        window: { get: self },
+    };
+    [
+        // for Node.js v0.12
+        "Buffer",
+        "clearInterval",
+        "clearTimeout",
+        // for Node.js v0.12
+        "DTRACE_NET_STREAM_END",
+        // for Node.js v8
+        "process",
+        "setInterval",
+        "setTimeout",
+    ].forEach(function(name) {
+        var value = global[name];
+        props[name] = {
+            get: function() {
+                return value;
+            },
+        };
+    });
+    builtins.forEach(function(name) {
+        try {
+            delete global[name];
+        } catch (e) {}
+    });
+    Object.defineProperties(global, props);
+    // for Node.js v8+
+    global.toString = function() {
+        return "[object global]";
+    };
+
+    function self() {
+        return this;
+    }
+
+    function safe_log(arg, cache) {
+        if (arg) switch (typeof arg) {
+          case "function":
+            return arg.toString();
+          case "object":
+            if (arg === global) return "[object global]";
+            if (/Error$/.test(arg.name)) return arg.toString();
+            if (typeof arg.then == "function") return "[object Promise]";
+            arg.constructor.toString();
+            var index = cache.original.indexOf(arg);
+            if (index >= 0) return cache.replaced[index];
+            if (--cache.level < 0) return "[object Object]";
+            var value = {};
+            cache.original.push(arg);
+            cache.replaced.push(value);
+            for (var key in arg) {
+                var desc = Object.getOwnPropertyDescriptor(arg, key);
+                if (desc && (desc.get || desc.set)) {
+                    Object.defineProperty(value, key, desc);
+                } else {
+                    value[key] = safe_log(arg[key], cache);
+                }
+            }
+            return value;
+        }
+        return arg;
+    }
+}
+
+function run_code_vm(code, toplevel, timeout) {
+    timeout = timeout || 5000;
+    var stdout = "";
+    var original_write = process.stdout.write;
+    process.stdout.write = function(chunk) {
+        stdout += chunk;
+    };
+    try {
+        var ctx = vm.createContext({ console: console });
+        // for Node.js v6
+        vm.runInContext(setup_code, ctx);
+        vm.runInContext(toplevel ? "(function(){" + code + "})();" : code, ctx, { timeout: timeout });
+        return strip_color_codes(stdout);
+    } catch (ex) {
+        return ex;
+    } finally {
+        process.stdout.write = original_write;
+    }
+}
+
+function run_code_exec(code, toplevel, timeout) {
+    if (toplevel) {
+        code = setup_code + "(function(){" + code + "})();";
+    } else {
+        code = code.replace(/^((["'])[^"']*\2(;|$))?/, function(directive) {
+            return directive + setup_code;
+        });
+    }
+    var result = spawnSync(process.argv[0], [ '--max-old-space-size=2048' ], {
+        encoding: "utf8",
+        input: code,
+        stdio: "pipe",
+        timeout: timeout || 5000,
+    });
+    if (result.status === 0) return result.stdout;
+    if (result.error && result.error.code == "ETIMEDOUT" || /FATAL ERROR:/.test(msg)) {
+        return new Error("Script execution timed out.");
+    }
+    if (result.error) return result.error;
+    var msg = result.stderr.replace(/\r\n/g, "\n");
+    var end = msg.indexOf("\n\n-----===== UNCAUGHT EXCEPTION =====-----\n\n");
+    var details;
+    if (end >= 0) {
+        details = msg.slice(0, end).replace(/<([1-9][0-9]*) empty items?>/g, function(match, count) {
+            return new Array(+count).join();
+        });
+        try {
+            details = vm.runInNewContext("(" + details + ")");
+        } catch (e) {}
+    }
+    var match = /\n([^:\s]*Error)(?:: ([\s\S]+?))?\n(    at [\s\S]+)\n$/.exec(msg);
+    if (!match) return details;
+    var ex = new global[match[1]](match[2]);
+    ex.stack = ex.stack.slice(0, ex.stack.indexOf("    at ")) + match[3];
+    if (typeof details == "object") {
+        for (var name in details) ex[name] = details[name];
+    } else if (end >= 0) {
+        ex.details = details;
+    }
+    return ex;
+}

test/ufuzz/actions.js

@@ -10,16 +10,17 @@ exports.init = function(url, auth, num) {
 exports.should_stop = function(callback) {
     read(base + "/actions/runs?per_page=100", function(reply) {
         if (!reply || !Array.isArray(reply.workflow_runs)) return;
-        var runs = reply.workflow_runs.filter(function(workflow) {
-            return workflow.status != "completed";
-        }).sort(function(a, b) {
+        var runs = reply.workflow_runs.sort(function(a, b) {
             return b.run_number - a.run_number;
         });
         var found = false, remaining = 20;
         (function next() {
-            if (!runs.length) return;
-            var workflow = runs.pop();
-            if (workflow.event == "schedule" && workflow.run_number == run_number) found = true;
+            var workflow;
+            do {
+                workflow = runs.pop();
+                if (!workflow) return;
+                if (workflow.event == "schedule" && workflow.run_number == run_number) found = true;
+            } while (!found && workflow.status == "completed");
             read(workflow.jobs_url, function(reply) {
                 if (!reply || !Array.isArray(reply.jobs)) return;
                 if (!reply.jobs.every(function(job) {

test/ufuzz/job.js

@@ -70,7 +70,7 @@ function run() {
 
     function trap(data) {
         stderr += data;
-        if (~stderr.indexOf("\nminify(options):\n")) {
+        if (~stderr.indexOf("!!!!!! Failed... round ")) {
             process.exitCode = 1;
             child.stderr.removeListener("data", trap);
         }

test/ufuzz/options.json

@@ -21,14 +21,16 @@
     },
     {
         "compress": {
+            "hoist_vars": true,
+            "keep_infinity": true,
             "passes": 1e6,
             "unsafe": true
         },
+        "keep_fnames": true,
         "toplevel": true
     },
     {
         "compress": {
-            "keep_fargs": false,
             "passes": 1e6,
             "sequences": 1e6,
             "unsafe": true,

tools/exit.js

@@ -1,15 +0,0 @@
-// workaround for tty output truncation upon process.exit()
-var exit = process.exit;
-process.exit = function() {
-    var args = [].slice.call(arguments);
-    process.once("uncaughtException", function() {
-        (function callback() {
-            if (process.stdout.bufferSize || process.stderr.bufferSize) {
-                setTimeout(callback, 1);
-            } else {
-                exit.apply(process, args);
-            }
-        })();
-    });
-    throw exit;
-};

tools/node.js

@@ -3,11 +3,11 @@ var fs = require("fs");
 exports.FILES = [
     require.resolve("../lib/utils.js"),
     require.resolve("../lib/ast.js"),
-    require.resolve("../lib/parse.js"),
     require.resolve("../lib/transform.js"),
+    require.resolve("../lib/parse.js"),
     require.resolve("../lib/scope.js"),
-    require.resolve("../lib/output.js"),
     require.resolve("../lib/compress.js"),
+    require.resolve("../lib/output.js"),
     require.resolve("../lib/sourcemap.js"),
     require.resolve("../lib/mozilla-ast.js"),
     require.resolve("../lib/propmangle.js"),
@@ -23,6 +23,37 @@ new Function("exports", function() {
     return code.join("\n\n");
 }())(exports);
 
+function to_comment(value) {
+    if (typeof value != "string") value = JSON.stringify(value, function(key, value) {
+        return typeof value == "function" ? "<[ " + value + " ]>" : value;
+    }, 2);
+    return "// " + value.replace(/\n/g, "\n// ");
+}
+
+if (+process.env["UGLIFY_BUG_REPORT"]) exports.minify = function(files, options) {
+    if (typeof options == "undefined") options = "<<undefined>>";
+    var code = [
+        "// UGLIFY_BUG_REPORT",
+        to_comment(options),
+    ];
+    if (typeof files == "string") {
+        code.push("");
+        code.push("//-------------------------------------------------------------")
+        code.push("// INPUT CODE", files);
+    } else for (var name in files) {
+        code.push("");
+        code.push("//-------------------------------------------------------------")
+        code.push(to_comment(name), files[name]);
+    }
+    if (options.sourceMap && options.sourceMap.url) {
+        code.push("");
+        code.push("//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbXSwibmFtZXMiOltdLCJtYXBwaW5ncyI6IiJ9");
+    }
+    var result = { code: code.join("\n") };
+    if (options.sourceMap) result.map = '{"version":3,"sources":[],"names":[],"mappings":""}';
+    return result;
+};
+
 function describe_ast() {
     var out = OutputStream({ beautify: true });
     function doitem(ctor) {

tools/tty.js

@@ -0,0 +1,22 @@
+// workaround for tty output truncation on Node.js
+try {
+    // prevent buffer overflow and other asynchronous bugs
+    process.stdout._handle.setBlocking(true);
+    process.stderr._handle.setBlocking(true);
+} catch (e) {
+    // ensure output buffers are flushed before process termination
+    var exit = process.exit;
+    process.exit = function() {
+        var args = [].slice.call(arguments);
+        process.once("uncaughtException", function() {
+            (function callback() {
+                if (process.stdout.bufferSize || process.stderr.bufferSize) {
+                    setTimeout(callback, 1);
+                } else {
+                    exit.apply(process, args);
+                }
+            })();
+        });
+        throw exit;
+    };
+}