Merge pull request #1591 from alexlamsl/harmony-v2.8.11

Merging from master for 2.8.11

.github/ISSUE_TEMPLATE.md

@@ -0,0 +1,7 @@
+- Bug report or feature request?
+- `uglify-js` version (`uglifyjs -V`)
+- JavaScript input - ideally as small as possible.
+- The `uglifyjs` CLI command executed or `minify()` options used.
+- An example of JavaScript output produced and/or the error or warning.
+
+Note: the release version of `uglify-js` only supports ES5. Those wishing to minify ES6 should use the experimental [`harmony`](https://github.com/mishoo/UglifyJS2#harmony) branch.

.travis.yml

@@ -1,10 +1,13 @@
 language: node_js
 before_install: "npm install -g npm"
 node_js:
-    - "0.12"
     - "0.10"
+    - "0.12"
     - "4"
     - "6"
+    - "7"
+env:
+    - UGLIFYJS_TEST_ALL=1
 matrix:
   fast_finish: true
 sudo: false

README.md

@@ -10,6 +10,9 @@ There's also an
 [in-browser online demo](http://lisperator.net/uglifyjs/#demo) (for Firefox,
 Chrome and probably Safari).
 
+Note: release versions of `uglify-js` only support ECMAScript 5 (ES5). If you wish to minify
+ES2015+ (ES6+) code then please use the [harmony](#harmony) development branch.
+
 Install
 -------
 
@@ -67,10 +70,11 @@ The available options are:
                                 JS that was generated from some other original
                                 code.
   --screw-ie8                   Use this flag if you don't wish to support
-                                Internet Explorer 6-8 quirks.
+                                Internet Explorer 6/7/8.
                                 By default UglifyJS will not try to be IE-proof.
-  --support-ie8                 Use this flag to support Internet Explorer 6-8 quirks.
-                                Note: may break standards compliant `catch` identifiers.
+  --support-ie8                 Use this flag to support Internet Explorer 6/7/8.
+                                Equivalent to setting `screw_ie8: false` in `minify()`
+                                for `compress`, `mangle` and `output` options.
   --expr                        Parse a single expression, rather than a
                                 program (for parsing JSON)
   -p, --prefix                  Skip prefix for original filenames that appear
@@ -84,10 +88,9 @@ The available options are:
   -b, --beautify                Beautify output/specify output options.
   -m, --mangle                  Mangle names/pass mangler options.
   -r, --reserved                Reserved names to exclude from mangling.
-  -c, --compress                Enable compressor/pass compressor options. Pass
-                                options like -c
-                                hoist_vars=false,if_return=false. Use -c with
-                                no argument to use the default compression
+  -c, --compress                Enable compressor/pass compressor options, e.g.
+                                `-c 'if_return=false,pure_funcs=["Math.pow","console.log"]'`
+                                Use `-c` with no argument to enable default compression
                                 options.
   -d, --define                  Global definitions
   -e, --enclose                 Embed everything in a big function, with a
@@ -148,8 +151,10 @@ The available options are:
                                 them explicitly on the command line.
   --mangle-regex                Only mangle property names matching the regex
   --name-cache                  File to hold mangled names mappings
-  --pure-funcs                  List of functions that can be safely removed if
-                                their return value is not used           [array]
+  --pure-funcs                  Functions that can be safely removed if their
+                                return value is not used, e.g.
+                                `--pure-funcs Math.floor console.info`
+                                (requires `--compress`)
 ```
 
 Specify `--output` (`-o`) to declare the output file.  Otherwise the output
@@ -285,6 +290,17 @@ of mangled property names.
 Using the name cache is not necessary if you compress all your files in a
 single call to UglifyJS.
 
+#### Mangling unquoted names (`--mangle-props=unquoted` or `--mangle-props=2`)
+
+Using quoted property name (`o["foo"]`) reserves the property name (`foo`)
+so that it is not mangled throughout the entire script even when used in an
+unquoted style (`o.foo`). Example:
+
+```
+$ echo 'var o={"foo":1, bar:3}; o.foo += o.bar; console.log(o.foo);' | uglifyjs --mangle-props=2 -mc
+var o={"foo":1,a:3};o.foo+=o.a,console.log(o.foo);
+```
+
 #### Debugging property name mangling
 
 You can also pass `--mangle-props-debug` in order to mangle property names
@@ -332,6 +348,12 @@ to set `true`; it's effectively a shortcut for `foo=true`).
   comparison are switching. Compression only works if both `comparisons` and
   `unsafe_comps` are both set to true.
 
+- `unsafe_math` (default: false) -- optimize numerical expressions like
+  `2 * x * 3` into `6 * x`, which may give imprecise floating point results.
+
+- `unsafe_proto` (default: false) -- optimize expressions like
+  `Array.prototype.slice.call(a)` into `[].slice.call(a)`
+
 - `conditionals` -- apply optimizations for `if`-s and conditional
   expressions
 
@@ -347,7 +369,15 @@ to set `true`; it's effectively a shortcut for `foo=true`).
 - `loops` -- optimizations for `do`, `while` and `for` loops when we can
   statically determine the condition
 
-- `unused` -- drop unreferenced functions and variables
+- `unused` -- drop unreferenced functions and variables (simple direct variable
+  assignments do not count as references unless set to `"keep_assign"`)
+
+- `toplevel` -- drop unreferenced functions (`"funcs"`) and/or variables (`"vars"`)
+  in the toplevel scope (`false` by default, `true` to drop both unreferenced
+  functions and variables)
+
+- `top_retain` -- prevent specific toplevel functions and variables from `unused`
+  removal (can be array, comma-separated, RegExp or function. Implies `toplevel`)
 
 - `hoist_funs` -- hoist function declarations
 
@@ -361,11 +391,11 @@ to set `true`; it's effectively a shortcut for `foo=true`).
 - `cascade` -- small optimization for sequences, transform `x, x` into `x`
   and `x = something(), x` into `x = something()`
 
-- `collapse_vars` -- default `false`. Collapse single-use `var` and `const`
-  definitions when possible.
+- `collapse_vars` -- Collapse single-use `var` and `const` definitions
+  when possible.
 
-- `reduce_vars` -- default `false`. Improve optimization on variables assigned
-  with and used as constant values.
+- `reduce_vars` -- Improve optimization on variables assigned with and
+  used as constant values.
 
 - `warnings` -- display warnings when dropping unreachable code or unused
   declarations etc.
@@ -390,7 +420,12 @@ to set `true`; it's effectively a shortcut for `foo=true`).
   overhead (compression will be slower).
 
 - `drop_console` -- default `false`.  Pass `true` to discard calls to
-  `console.*` functions.
+  `console.*` functions. If you wish to drop a specific function call
+  such as `console.info` and/or retain side effects from function arguments
+  after dropping the function call then use `pure_funcs` instead.
+
+- `expression` -- default `false`.  Pass `true` to preserve completion values
+  from terminal statements without `return`, e.g. in bookmarklets.
 
 - `keep_fargs` -- default `true`.  Prevents the
   compressor from discarding unused function arguments.  You need this
@@ -432,6 +467,8 @@ if (DEBUG) {
 }
 ```
 
+You can specify nested constants in the form of `--define env.DEBUG=false`.
+
 UglifyJS will warn about the condition being always false and about dropping
 unreachable code; for now there is no option to turn off only this specific
 warning, you can pass `warnings=false` to turn off *all* warnings.
@@ -442,8 +479,6 @@ separate file and include it into the build.  For example you can have a
 ```javascript
 const DEBUG = false;
 const PRODUCTION = true;
-// Alternative for environments that don't support `const`
-/** @const */ var STAGING = false;
 // etc.
 ```
 
@@ -454,7 +489,8 @@ and build your code like this:
 UglifyJS will notice the constants and, since they cannot be altered, it
 will evaluate references to them to the value itself and drop unreachable
 code as usual.  The build will contain the `const` declarations if you use
-them. If you are targeting < ES6 environments, use `/** @const */ var`.
+them. If you are targeting < ES6 environments which does not support `const`,
+using `var` with `reduce_vars` (enabled by default) should suffice.
 
 <a name="codegen-options"></a>
 
@@ -592,7 +628,7 @@ function uglify(ast, options, mangle) {
 
   // Compression
   uAST.figure_out_scope();
-  uAST = uAST.transform(UglifyJS.Compressor(options));
+  uAST = UglifyJS.Compressor(options).compress(uAST);
 
   // Mangling (optional)
   if (mangle) {
@@ -836,7 +872,7 @@ toplevel.figure_out_scope()
 Like this:
 ```javascript
 var compressor = UglifyJS.Compressor(options);
-var compressed_ast = toplevel.transform(compressor);
+var compressed_ast = compressor.compress(toplevel);
 ```
 
 The `options` can be missing.  Available options are discussed above in
@@ -940,3 +976,20 @@ The `source_map_options` (optional) can contain the following properties:
   [codegen]: http://lisperator.net/uglifyjs/codegen
   [compressor]: http://lisperator.net/uglifyjs/compress
   [parser]: http://lisperator.net/uglifyjs/parser
+
+#### Harmony
+
+If you wish to use the experimental [harmony](https://github.com/mishoo/UglifyJS2/commits/harmony)
+branch to minify ES2015+ (ES6+) code please use the following in your `package.json` file:
+
+```
+"uglify-js": "git+https://github.com/mishoo/UglifyJS2.git#harmony"
+```
+
+or to directly install the experimental harmony version of uglify:
+
+```
+npm install --save-dev uglify-js@github:mishoo/UglifyJS2#harmony
+```
+
+See [#448](https://github.com/mishoo/UglifyJS2/issues/448) for additional details.

bin/uglifyjs

@@ -8,7 +8,6 @@ var sys = require("util");
 var yargs = require("yargs");
 var fs = require("fs");
 var path = require("path");
-var async = require("async");
 var acorn;
 var screw_ie8 = true;
 var ARGS = yargs
@@ -26,8 +25,8 @@ mangling you need to use `-c` and `-m`.\
     .describe("source-map-inline", "Write base64-encoded source map to the end of js output.  Disabled by default")
     .describe("source-map-include-sources", "Pass this flag if you want to include the content of source files in the source map as sourcesContent property.")
     .describe("in-source-map", "Input source map, useful if you're compressing JS that was generated from some other original code.")
-    .describe("screw-ie8", "Do not support Internet Explorer 6-8 quirks. This flag is enabled by default.")
-    .describe("support-ie8", "Support non-standard Internet Explorer 6-8 javascript. Note: may break standards compliant `catch` identifiers.")
+    .describe("screw-ie8", "Do not support Internet Explorer 6/7/8. This flag is enabled by default.")
+    .describe("support-ie8", "Support non-standard Internet Explorer 6/7/8 javascript.")
     .describe("expr", "Parse a single expression, rather than a program (for parsing JSON)")
     .describe("p", "Skip prefix for original filenames that appear in source maps. \
 For example -p 3 will drop 3 directories from file names and ensure they are relative paths. \
@@ -228,9 +227,10 @@ if (ARGS.mangle_props === true) {
 }
 
 var OUTPUT_OPTIONS = {
-    beautify    : BEAUTIFY ? true : false,
-    preamble    : ARGS.preamble || null,
-    quote_style : ARGS.quotes != null ? ARGS.quotes : 0
+    beautify     : BEAUTIFY ? true : false,
+    max_line_len : 32000,
+    preamble     : ARGS.preamble || null,
+    quote_style  : ARGS.quotes != null ? ARGS.quotes : 0,
 };
 
 if (ARGS.mangle_props == 2) {
@@ -281,21 +281,29 @@ if (ARGS.self) {
 
 var ORIG_MAP = ARGS.in_source_map;
 
-if (ORIG_MAP) {
+if (ORIG_MAP && ORIG_MAP != "inline") {
     ORIG_MAP = JSON.parse(fs.readFileSync(ORIG_MAP));
     if (files.length == 0) {
         print_error("INFO: Using file from the input source map: " + ORIG_MAP.file);
         files = [ ORIG_MAP.file ];
     }
-    if (ARGS.source_map_root == null) {
-        ARGS.source_map_root = ORIG_MAP.sourceRoot;
-    }
 }
 
 if (files.length == 0) {
     files = [ "-" ];
 }
 
+if (ORIG_MAP == "inline") {
+    if (files.length > 1) {
+        print_error("ERROR: Inline source map only works with singular input");
+        process.exit(1);
+    }
+    if (ARGS.acorn || ARGS.spidermonkey) {
+        print_error("ERROR: Inline source map only works with built-in parser");
+        process.exit(1);
+    }
+}
+
 if (files.indexOf("-") >= 0 && ARGS.source_map) {
     print_error("ERROR: Source map doesn't work with input from STDIN");
     process.exit(1);
@@ -307,37 +315,22 @@ if (files.filter(function(el){ return el == "-" }).length > 1) {
 }
 
 var STATS = {};
-var OUTPUT_FILE = ARGS.o;
 var TOPLEVEL = null;
 var P_RELATIVE = ARGS.p && ARGS.p == "relative";
 var SOURCES_CONTENT = {};
+var index = 0;
 
-var SOURCE_MAP = (ARGS.source_map || ARGS.source_map_inline) ? UglifyJS.SourceMap({
-    file: P_RELATIVE ? path.relative(path.dirname(ARGS.source_map), OUTPUT_FILE) : OUTPUT_FILE,
-    root: ARGS.source_map_root,
-    orig: ORIG_MAP,
-}) : null;
-
-OUTPUT_OPTIONS.source_map = SOURCE_MAP;
-
-try {
-    var output = UglifyJS.OutputStream(OUTPUT_OPTIONS);
-    var compressor = COMPRESS && UglifyJS.Compressor(COMPRESS);
-} catch(ex) {
-    if (ex instanceof UglifyJS.DefaultsError) {
-        print_error(ex.msg);
-        print_error("Supported options:");
-        print_error(sys.inspect(ex.defs));
-        process.exit(1);
-    }
-}
-
-async.eachLimit(files, 1, function (file, cb) {
+!function cb() {
+    if (index == files.length) return done();
+    var file = files[index++];
     read_whole_file(file, function (err, code) {
         if (err) {
             print_error("ERROR: can't read file: " + file);
             process.exit(1);
         }
+        if (ORIG_MAP == "inline") {
+            ORIG_MAP = read_source_map(code);
+        }
         if (ARGS.p != null) {
             if (P_RELATIVE) {
                 file = path.relative(path.dirname(ARGS.source_map), file).replace(/\\/g, '/');
@@ -373,7 +366,21 @@ async.eachLimit(files, 1, function (file, cb) {
                 } catch(ex) {
                     if (ex instanceof UglifyJS.JS_Parse_Error) {
                         print_error("Parse error at " + file + ":" + ex.line + "," + ex.col);
-                        print_error(ex.message);
+                        var col = ex.col;
+                        var line = code.split(/\r?\n/)[ex.line - (col ? 1 : 2)];
+                        if (line) {
+                            if (col > 40) {
+                                line = line.slice(col - 40);
+                                col = 40;
+                            }
+                            if (col) {
+                                print_error(line.slice(0, 80));
+                                print_error(line.slice(0, col).replace(/\S/g, " ") + "^");
+                            } else {
+                                print_error(line.slice(-40));
+                                print_error(line.slice(-40).replace(/\S/g, " ") + "^");
+                            }
+                        }
                         print_error(ex.stack);
                         process.exit(1);
                     }
@@ -383,7 +390,31 @@ async.eachLimit(files, 1, function (file, cb) {
         });
         cb();
     });
-}, function () {
+}();
+
+function done() {
+    var OUTPUT_FILE = ARGS.o;
+
+    var SOURCE_MAP = (ARGS.source_map || ARGS.source_map_inline) ? UglifyJS.SourceMap({
+        file: P_RELATIVE ? path.relative(path.dirname(ARGS.source_map), OUTPUT_FILE) : OUTPUT_FILE,
+        root: ARGS.source_map_root || ORIG_MAP && ORIG_MAP.sourceRoot,
+        orig: ORIG_MAP,
+    }) : null;
+
+    OUTPUT_OPTIONS.source_map = SOURCE_MAP;
+
+    try {
+        var output = UglifyJS.OutputStream(OUTPUT_OPTIONS);
+        var compressor = COMPRESS && UglifyJS.Compressor(COMPRESS);
+    } catch(ex) {
+        if (ex instanceof UglifyJS.DefaultsError) {
+            print_error(ex.message);
+            print_error("Supported options:");
+            print_error(sys.inspect(ex.defs));
+            process.exit(1);
+        }
+    }
+
     if (ARGS.acorn || ARGS.spidermonkey) time_it("convert_ast", function(){
         TOPLEVEL = UglifyJS.AST_Node.from_mozilla_ast(TOPLEVEL);
     });
@@ -428,10 +459,11 @@ async.eachLimit(files, 1, function (file, cb) {
 
     var SCOPE_IS_NEEDED = COMPRESS || MANGLE || ARGS.lint
     var TL_CACHE = readNameCache("vars");
+    if (MANGLE) MANGLE.cache = TL_CACHE;
 
     if (SCOPE_IS_NEEDED) {
         time_it("scope", function(){
-            TOPLEVEL.figure_out_scope({ screw_ie8: screw_ie8, cache: TL_CACHE });
+            TOPLEVEL.figure_out_scope(MANGLE || { screw_ie8: screw_ie8, cache: TL_CACHE });
             if (ARGS.lint) {
                 TOPLEVEL.scope_warnings();
             }
@@ -446,7 +478,7 @@ async.eachLimit(files, 1, function (file, cb) {
 
     if (SCOPE_IS_NEEDED) {
         time_it("scope", function(){
-            TOPLEVEL.figure_out_scope({ screw_ie8: screw_ie8, cache: TL_CACHE });
+            TOPLEVEL.figure_out_scope(MANGLE || { screw_ie8: screw_ie8, cache: TL_CACHE });
             if (MANGLE && !TL_CACHE) {
                 TOPLEVEL.compute_char_frequency(MANGLE);
             }
@@ -454,7 +486,6 @@ async.eachLimit(files, 1, function (file, cb) {
     }
 
     if (MANGLE) time_it("mangle", function(){
-        MANGLE.cache = TL_CACHE;
         TOPLEVEL.mangle_names(MANGLE);
     });
 
@@ -510,7 +541,7 @@ async.eachLimit(files, 1, function (file, cb) {
             }));
         }
     }
-});
+}
 
 /* -----[ functions ]----- */
 
@@ -540,7 +571,7 @@ function getOptions(flag, constants) {
         ast.walk(new UglifyJS.TreeWalker(function(node){
             if (node instanceof UglifyJS.AST_Seq) return; // descend
             if (node instanceof UglifyJS.AST_Assign) {
-                var name = node.left.print_to_string({ beautify: false }).replace(/-/g, "_");
+                var name = node.left.print_to_string().replace(/-/g, "_");
                 var value = node.right;
                 if (constants)
                     value = new Function("return (" + value.print_to_string() + ")")();
@@ -548,7 +579,7 @@ function getOptions(flag, constants) {
                 return true;    // no descend
             }
             if (node instanceof UglifyJS.AST_Symbol || node instanceof UglifyJS.AST_Binary) {
-                var name = node.print_to_string({ beautify: false }).replace(/-/g, "_");
+                var name = node.print_to_string().replace(/-/g, "_");
                 ret[name] = true;
                 return true;    // no descend
             }
@@ -575,6 +606,15 @@ function read_whole_file(filename, cb) {
     }
 }
 
+function read_source_map(code) {
+    var match = /\n\/\/# sourceMappingURL=data:application\/json(;.*?)?;base64,(.*)/.exec(code);
+    if (!match) {
+        print_error("WARN: inline source map not found");
+        return null;
+    }
+    return JSON.parse(new Buffer(match[2], "base64"));
+}
+
 function time_it(name, cont) {
     var t1 = new Date().getTime();
     var ret = cont();

lib/ast.js

@@ -81,7 +81,9 @@ function DEFNODE(type, props, methods, base) {
     ctor.DEFMETHOD = function(name, method) {
         this.prototype[name] = method;
     };
-    exports["AST_" + type] = ctor;
+    if (typeof exports !== "undefined") {
+        exports["AST_" + type] = ctor;
+    }
     return ctor;
 };
 
@@ -89,9 +91,20 @@ var AST_Token = DEFNODE("Token", "type value line col pos endline endcol endpos
 }, null);
 
 var AST_Node = DEFNODE("Node", "start end", {
-    clone: function() {
+    _clone: function(deep) {
+        if (deep) {
+            var self = this.clone();
+            return self.transform(new TreeTransformer(function(node) {
+                if (node !== self) {
+                    return node.clone(true);
+                }
+            }));
+        }
         return new this.CTOR(this);
     },
+    clone: function(deep) {
+        return this._clone(deep);
+    },
     $documentation: "Base class of all AST nodes",
     $propdoc: {
         start: "[AST_Token] The first token of this node",
@@ -143,12 +156,13 @@ var AST_SimpleStatement = DEFNODE("SimpleStatement", "body", {
 }, AST_Statement);
 
 function walk_body(node, visitor) {
-    if (node.body instanceof AST_Node) {
-        node.body._walk(visitor);
+    var body = node.body;
+    if (body instanceof AST_Node) {
+        body._walk(visitor);
+    }
+    else for (var i = 0, len = body.length; i < len; i++) {
+        body[i]._walk(visitor);
     }
-    else node.body.forEach(function(stat){
-        stat._walk(visitor);
-    });
 };
 
 var AST_Block = DEFNODE("Block", "body", {
@@ -196,6 +210,20 @@ var AST_LabeledStatement = DEFNODE("LabeledStatement", "label", {
             this.label._walk(visitor);
             this.body._walk(visitor);
         });
+    },
+    clone: function(deep) {
+        var node = this._clone(deep);
+        if (deep) {
+            var refs = node.label.references;
+            var label = this.label;
+            node.walk(new TreeWalker(function(node) {
+                if (node instanceof AST_LoopControl
+                    && node.label && node.label.thedef === label) {
+                    refs.push(node);
+                }
+            }));
+        }
+        return node;
     }
 }, AST_StatementWithBody);
 
@@ -392,46 +420,56 @@ var AST_ArrowParametersOrSeq = DEFNODE("ArrowParametersOrSeq", "expressions", {
         // We don't want anything which doesn't belong in a destructuring
         var root = this;
         return this.expressions.map(function to_fun_args(ex, _, __, default_seen_above) {
+            var insert_default = function(ex, default_value) {
+                if (default_value) {
+                    return new AST_DefaultAssign({
+                        start: ex.start,
+                        left: ex,
+                        operator: "=",
+                        right: default_value,
+                        end: default_value.end
+                    });
+                }
+                return ex;
+            }
             if (ex instanceof AST_Object) {
-                return new AST_Destructuring({
+                return insert_default(new AST_Destructuring({
                     start: ex.start,
                     end: ex.end,
                     is_array: false,
-                    default: default_seen_above,
                     names: ex.properties.map(to_fun_args)
-                });
+                }), default_seen_above);
             } else if (ex instanceof AST_ObjectKeyVal) {
                 if (ex.key instanceof AST_SymbolRef) {
-                    ex.key = to_fun_args(ex.key, 0, [ex.key], ex.default);
+                    ex.key = to_fun_args(ex.key, 0, [ex.key]);
                 }
-                ex.value = to_fun_args(ex.value, 0, [ex.key], ex.default);
-                return ex;
+                ex.value = to_fun_args(ex.value, 0, [ex.key]);
+                return insert_default(ex, default_seen_above);
             } else if (ex instanceof AST_Hole) {
                 return ex;
             } else if (ex instanceof AST_Destructuring) {
                 if (ex.names.length == 0)
                     croak("Invalid destructuring function parameter", ex.start.line, ex.start.col);
                 ex.names = ex.names.map(to_fun_args);
-                return ex;
+                return insert_default(ex, default_seen_above);
             } else if (ex instanceof AST_SymbolRef) {
-                return new AST_SymbolFunarg({
+                return insert_default(new AST_SymbolFunarg({
                     name: ex.name,
-                    default: default_seen_above,
                     start: ex.start,
                     end: ex.end
-                });
+                }), default_seen_above);
             } else if (ex instanceof AST_Expansion) {
-                return ex;
+                ex.expression = to_fun_args(ex.expression);
+                return insert_default(ex, default_seen_above);
             } else if (ex instanceof AST_Array) {
-                return new AST_Destructuring({
+                return insert_default(new AST_Destructuring({
                     start: ex.start,
                     end: ex.end,
                     is_array: true,
-                    default: default_seen_above,
                     names: ex.elements.map(to_fun_args)
-                });
+                }), default_seen_above);
             } else if (ex instanceof AST_Assign) {
-                return to_fun_args(ex.left, undefined, undefined, ex.right);
+                return insert_default(to_fun_args(ex.left, undefined, undefined, ex.right), default_seen_above);
             } else {
                 croak("Invalid function parameter", ex.start.line, ex.start.col);
             }
@@ -447,7 +485,7 @@ var AST_Lambda = DEFNODE("Lambda", "name argnames uses_arguments is_generator",
     $propdoc: {
         is_generator: "[boolean] is generatorFn or not",
         name: "[AST_SymbolDeclaration?] the name of this function",
-        argnames: "[AST_SymbolFunarg|AST_Destructuring|AST_Expansion*] array of function arguments, destructurings, or expanding arguments",
+        argnames: "[AST_SymbolFunarg|AST_Destructuring|AST_Expansion|AST_DefaultAssign*] array of function arguments, destructurings, or expanding arguments",
         uses_arguments: "[boolean/S] tells whether this function accesses the arguments array"
     },
     args_as_names: function () {
@@ -464,9 +502,10 @@ var AST_Lambda = DEFNODE("Lambda", "name argnames uses_arguments is_generator",
     _walk: function(visitor) {
         return visitor._visit(this, function(){
             if (this.name) this.name._walk(visitor);
-            this.argnames.forEach(function(arg){
-                arg._walk(visitor);
-            });
+            var argnames = this.argnames;
+            for (var i = 0, len = argnames.length; i < len; i++) {
+                argnames[i]._walk(visitor);
+            }
             walk_body(this, visitor);
         });
     }
@@ -489,12 +528,11 @@ var AST_Defun = DEFNODE("Defun", null, {
 }, AST_Lambda);
 
 /* -----[ DESTRUCTURING ]----- */
-var AST_Destructuring = DEFNODE("Destructuring", "names is_array default", {
+var AST_Destructuring = DEFNODE("Destructuring", "names is_array", {
     $documentation: "A destructuring of several names. Used in destructuring assignment and with destructuring function argument names",
     $propdoc: {
-        "names": "[AST_Destructuring|AST_Expansion|AST_Hole|AST_ObjectKeyVal|AST_Symbol] Array of properties or elements",
-        "is_array": "[Boolean] Whether the destructuring represents an object or array",
-        "default": "[AST_Node?] Default assign value"
+        "names": "[AST_Node*] Array of properties or elements",
+        "is_array": "[Boolean] Whether the destructuring represents an object or array"
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
@@ -672,7 +710,7 @@ 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"
+        argname: "[AST_SymbolCatch|AST_Destructuring|AST_Expansion|AST_DefaultAssign] symbol for the exception"
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
@@ -695,9 +733,10 @@ var AST_Definitions = DEFNODE("Definitions", "definitions", {
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
-            this.definitions.forEach(function(def){
-                def._walk(visitor);
-            });
+            var definitions = this.definitions;
+            for (var i = 0, len = definitions.length; i < len; i++) {
+                definitions[i]._walk(visitor);
+            }
         });
     }
 }, AST_Statement);
@@ -797,9 +836,10 @@ var AST_Call = DEFNODE("Call", "expression args", {
     _walk: function(visitor) {
         return visitor._visit(this, function(){
             this.expression._walk(visitor);
-            this.args.forEach(function(arg){
-                arg._walk(visitor);
-            });
+            var args = this.args;
+            for (var i = 0, len = args.length; i < len; i++) {
+                args[i]._walk(visitor);
+            }
         });
     }
 });
@@ -957,6 +997,10 @@ var AST_Assign = DEFNODE("Assign", null, {
     $documentation: "An assignment expression — `a = b + 5`",
 }, AST_Binary);
 
+var AST_DefaultAssign = DEFNODE("DefaultAssign", null, {
+    $documentation: "A default assignment expression like in `(a = 3) => a`"
+}, AST_Binary);
+
 /* -----[ LITERALS ]----- */
 
 var AST_Array = DEFNODE("Array", "elements", {
@@ -966,9 +1010,10 @@ var AST_Array = DEFNODE("Array", "elements", {
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
-            this.elements.forEach(function(el){
-                el._walk(visitor);
-            });
+            var elements = this.elements;
+            for (var i = 0, len = elements.length; i < len; i++) {
+                elements[i]._walk(visitor);
+            }
         });
     }
 });
@@ -980,9 +1025,10 @@ var AST_Object = DEFNODE("Object", "properties", {
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
-            this.properties.forEach(function(prop){
-                prop._walk(visitor);
-            });
+            var properties = this.properties;
+            for (var i = 0, len = properties.length; i < len; i++) {
+                properties[i]._walk(visitor);
+            }
         });
     }
 });
@@ -991,8 +1037,7 @@ var AST_ObjectProperty = DEFNODE("ObjectProperty", "key value", {
     $documentation: "Base class for literal object properties",
     $propdoc: {
         key: "[string|AST_Node] the property name converted to a string for ObjectKeyVal. For setters, getters and computed property this is an arbitrary AST_Node",
-        value: "[AST_Node] property value. For setters and getters this is an AST_Function.",
-        default: "[AST_Expression] The default for this parameter, only used when nested inside a binding pattern"
+        value: "[AST_Node] property value. For setters and getters this is an AST_Function."
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
@@ -1003,11 +1048,10 @@ var AST_ObjectProperty = DEFNODE("ObjectProperty", "key value", {
     }
 });
 
-var AST_ObjectKeyVal = DEFNODE("ObjectKeyVal", "quote default", {
+var AST_ObjectKeyVal = DEFNODE("ObjectKeyVal", "quote", {
     $documentation: "A key: value object property",
     $propdoc: {
-        quote: "[string] the original quote character",
-        default: "[AST_Expression] The default parameter value, only used when nested inside a binding pattern"
+        quote: "[string] the original quote character"
     }
 }, AST_ObjectProperty);
 
@@ -1066,19 +1110,13 @@ var AST_ClassExpression = DEFNODE("ClassExpression", null, {
     $documentation: "A class expression."
 }, AST_Class);
 
-var AST_Symbol = DEFNODE("Symbol", "scope name thedef default", {
+var AST_Symbol = DEFNODE("Symbol", "scope name thedef", {
     $propdoc: {
         name: "[string] name of this symbol",
         scope: "[AST_Scope/S] the current scope (not necessarily the definition scope)",
-        thedef: "[SymbolDef/S] the definition of this symbol",
-        default: "[AST_Expression] The default parameter value, only used when nested inside a binding pattern"
+        thedef: "[SymbolDef/S] the definition of this symbol"
     },
-    $documentation: "Base class for all symbols",
-    _walk: function (visitor) {
-        return visitor._visit(this, function() {
-            if (this.default) this.default._walk(visitor);
-        });
-    }
+    $documentation: "Base class for all symbols"
 });
 
 var AST_NewTarget = DEFNODE("NewTarget", null, {
@@ -1091,9 +1129,6 @@ var AST_SymbolAccessor = DEFNODE("SymbolAccessor", null, {
 
 var AST_SymbolDeclaration = DEFNODE("SymbolDeclaration", "init", {
     $documentation: "A declaration symbol (symbol in var/const, function name or argument, symbol in catch)",
-    $propdoc: {
-        init: "[AST_Node*/S] array of initializers for this declaration."
-    },
 }, AST_Symbol);
 
 var AST_SymbolVar = DEFNODE("SymbolVar", null, {

lib/output.js

@@ -46,17 +46,8 @@
 var EXPECT_DIRECTIVE = /^$|[;{][\s\n]*$/;
 
 function is_some_comments(comment) {
-    var text = comment.value;
-    var type = comment.type;
-    if (type == "comment2") {
-        // multiline comment
-        return /@preserve|@license|@cc_on/i.test(text);
-    }
-    return type == "comment5";
-}
-
-function is_comment5(comment) {
-    return comment.type == "comment5";
+    // multiline comment
+    return comment.type == "comment2" && /@preserve|@license|@cc_on/i.test(comment.value);
 }
 
 function OutputStream(options) {
@@ -71,7 +62,7 @@ function OutputStream(options) {
         unescape_regexps : false,
         inline_script    : false,
         width            : 80,
-        max_line_len     : 32000,
+        max_line_len     : false,
         beautify         : false,
         source_map       : null,
         bracketize       : false,
@@ -95,7 +86,7 @@ function OutputStream(options) {
         options.shorthand = options.ecma > 5;
 
     // Convert comment option to RegExp if neccessary and set up comments filter
-    var comment_filter = options.shebang ? is_comment5 : return_false; // Default case, throw all comments away except shebangs
+    var comment_filter = return_false; // Default case, throw all comments away
     if (options.comments) {
         var comments = options.comments;
         if (typeof options.comments === "string" && /^\/.*\/[a-zA-Z]*$/.test(options.comments)) {
@@ -107,12 +98,12 @@ function OutputStream(options) {
         }
         if (comments instanceof RegExp) {
             comment_filter = function(comment) {
-                return comment.type == "comment5" || comments.test(comment.value);
+                return comment.type != "comment5" && comments.test(comment.value);
             };
         }
         else if (typeof comments === "function") {
             comment_filter = function(comment) {
-                return comment.type == "comment5" || comments(this, comment);
+                return comment.type != "comment5" && comments(this, comment);
             };
         }
         else if (comments === "some") {
@@ -232,6 +223,7 @@ function OutputStream(options) {
 
     var might_need_space = false;
     var might_need_semicolon = false;
+    var might_add_newline = 0;
     var last = null;
 
     function last_char() {
@@ -244,10 +236,22 @@ function OutputStream(options) {
         return char;
     };
 
-    function maybe_newline() {
-        if (options.max_line_len && current_col > options.max_line_len)
-            print("\n");
-    };
+    var ensure_line_len = options.max_line_len ? function() {
+        if (current_col > options.max_line_len) {
+            if (might_add_newline) {
+                var left = OUTPUT.slice(0, might_add_newline);
+                var right = OUTPUT.slice(might_add_newline);
+                OUTPUT = left + "\n" + right;
+                current_line++;
+                current_pos++;
+                current_col = right.length;
+            }
+            if (current_col > options.max_line_len) {
+                AST_Node.warn("Output exceeds {max_line_len} characters", options);
+            }
+        }
+        might_add_newline = 0;
+    } : noop;
 
     var requireSemicolonChars = makePredicate("( [ + * / - , .");
 
@@ -263,6 +267,7 @@ function OutputStream(options) {
                     current_col++;
                     current_pos++;
                 } else {
+                    ensure_line_len();
                     OUTPUT += "\n";
                     current_pos++;
                     current_line++;
@@ -283,6 +288,7 @@ function OutputStream(options) {
         if (!options.beautify && options.preserve_line && stack[stack.length - 1]) {
             var target_line = stack[stack.length - 1].start.line;
             while (current_line < target_line) {
+                ensure_line_len();
                 OUTPUT += "\n";
                 current_pos++;
                 current_line++;
@@ -294,8 +300,9 @@ function OutputStream(options) {
         if (might_need_space) {
             var prev = last_char();
             if ((is_identifier_char(prev)
-                 && (is_identifier_char(ch) || ch == "\\"))
-                || (/^[\+\-\/]$/.test(ch) && ch == prev))
+                    && (is_identifier_char(ch) || ch == "\\"))
+                || (ch == "/" && ch == prev)
+                || ((ch == "+" || ch == "-") && ch == last))
             {
                 OUTPUT += " ";
                 current_col++;
@@ -303,16 +310,16 @@ function OutputStream(options) {
             }
             might_need_space = false;
         }
+        OUTPUT += str;
+        current_pos += str.length;
         var a = str.split(/\r?\n/), n = a.length - 1;
         current_line += n;
-        if (n == 0) {
-            current_col += a[n].length;
-        } else {
+        current_col += a[0].length;
+        if (n > 0) {
+            ensure_line_len();
             current_col = a[n].length;
         }
-        current_pos += str.length;
         last = str;
-        OUTPUT += str;
     };
 
     var star = function(){
@@ -342,7 +349,10 @@ function OutputStream(options) {
 
     var newline = options.beautify ? function() {
         print("\n");
-    } : maybe_newline;
+    } : options.max_line_len ? function() {
+        ensure_line_len();
+        might_add_newline = OUTPUT.length;
+    } : noop;
 
     var semicolon = options.beautify ? function() {
         print(";");
@@ -419,13 +429,12 @@ function OutputStream(options) {
     } : noop;
 
     function get() {
+        if (might_add_newline) {
+            ensure_line_len();
+        }
         return OUTPUT;
     };
 
-    if (options.preamble) {
-        print(options.preamble.replace(/\r\n?|[\n\u2028\u2029]|\s*$/g, "\n"));
-    }
-
     var stack = [];
     return {
         get             : get,
@@ -474,7 +483,6 @@ function OutputStream(options) {
         pos             : function() { return current_pos },
         push_node       : function(node) { stack.push(node) },
         pop_node        : function() { return stack.pop() },
-        stack           : function() { return stack },
         parent          : function(n) {
             return stack[stack.length - 2 - (n || 0)];
         }
@@ -551,6 +559,17 @@ function OutputStream(options) {
                 }));
             }
 
+            if (comments.length > 0 && output.pos() == 0) {
+                if (output.option("shebang") && comments[0].type == "comment5") {
+                    output.print("#!" + comments.shift().value + "\n");
+                    output.indent();
+                }
+                var preamble = output.option("preamble");
+                if (preamble) {
+                    output.print(preamble.replace(/\r\n?|[\n\u2028\u2029]|\s*$/g, "\n"));
+                }
+            }
+
             comments = comments.filter(output.comment_filter, self);
 
             // Keep single line comments after nlb, after nlb
@@ -575,10 +594,6 @@ function OutputStream(options) {
                         output.space();
                     }
                 }
-                else if (output.pos() === 0 && c.type == "comment5" && output.option("shebang")) {
-                    output.print("#!" + c.value + "\n");
-                    output.indent();
-                }
             });
         }
     });
@@ -614,6 +629,11 @@ function OutputStream(options) {
         return false;
     });
 
+    PARENS(AST_Arrow, function(output){
+        var p = output.parent();
+        return p instanceof AST_PropAccess && p.expression === this;
+    });
+
     // same goes for an object literal, because otherwise it would be
     // interpreted as a block of code.
     PARENS(AST_Object, function(output){
@@ -641,13 +661,10 @@ function OutputStream(options) {
             || p instanceof AST_PropAccess       // (1, {foo:2}).foo or (1, {foo:2})["foo"] ==> 2
             || p instanceof AST_Array            // [ 1, (2, 3), 4 ] ==> [ 1, 3, 4 ]
             || p instanceof AST_ObjectProperty   // { foo: (1, 2) }.foo ==> 2
-            || (p instanceof AST_SymbolConst && p.default === this) // const { xCover = (0, function() {}) }
-            || (p instanceof AST_SymbolLet && p.default === this) // let { xCover = (0, function() {}) }
-            || (p instanceof AST_SymbolVar && p.default === this) // var { xCover = (0, function() {}) }
-            || (p instanceof AST_SymbolCatch && p.default === this) // } catch (xCover = (0, function() {}) ) {
             || p instanceof AST_Conditional      /* (false, true) ? (a = 10, b = 20) : (c = 30)
                                                   * ==> 20 (side effect, set a := 10 and b := 20) */
             || p instanceof AST_Arrow            // x => (x, x)
+            || p instanceof AST_DefaultAssign    // x => (x = (0, function(){}))
         ;
     });
 
@@ -686,6 +703,10 @@ function OutputStream(options) {
         // -(yield 4)
         if (p instanceof AST_Unary)
             return true;
+        // (yield x).foo
+        // (yield x)['foo']
+        if (p instanceof AST_PropAccess && p.expression === this)
+            return true;
     });
 
     PARENS(AST_PropAccess, function(output){
@@ -757,6 +778,9 @@ function OutputStream(options) {
         // (a = foo)["prop"] —or— (a = foo).prop
         if (p instanceof AST_PropAccess && p.expression === this)
             return true;
+        // ({a, b} = {a: 1, b: 2}), a destructuring assignment
+        if (this instanceof AST_Assign && this.left instanceof AST_Destructuring && this.left.is_array === false)
+            return true;
     });
 
     /* -----[ PRINTERS ]----- */
@@ -785,12 +809,6 @@ function OutputStream(options) {
               output.comma();
         })
         output.print(self.is_array ? "]" : "}");
-        if (self.default) {
-            output.space();
-            output.print('=');
-            output.space();
-            self.default.print(output)
-        }
     });
 
     DEFPRINT(AST_Debugger, function(self, output){
@@ -864,7 +882,7 @@ function OutputStream(options) {
     DEFPRINT(AST_Do, function(self, output){
         output.print("do");
         output.space();
-        self._do_print_body(output);
+        make_block(self.body, output);
         output.space();
         output.print("while");
         output.space();
@@ -951,11 +969,7 @@ function OutputStream(options) {
             }
         }
         if (self.name instanceof AST_Symbol) {
-            if (typeof self.name.name === "string" && !is_identifier_string(self.name.name)) {
-                output.print_string(self.name.name);
-            } else {
-                self.name.print(output);
-            }
+            self.name.print(output);
         } else if (nokeyword && self.name instanceof AST_Node) {
             output.with_square(function() {
                 self.name.print(output); // Computed method name
@@ -1003,7 +1017,7 @@ function OutputStream(options) {
             parent instanceof AST_Unary ||
             (parent instanceof AST_Call && self === parent.expression);
         if (needs_parens) { output.print("(") }
-        if (self.argnames.length === 1 && self.argnames[0] instanceof AST_Symbol && !self.argnames[0].default) {
+        if (self.argnames.length === 1 && self.argnames[0] instanceof AST_Symbol) {
             self.argnames[0].print(output);
         } else {
             output.with_parens(function(){
@@ -1069,10 +1083,10 @@ function OutputStream(options) {
 
     /* -----[ if ]----- */
     function make_then(self, output) {
-        if (output.option("bracketize")) {
-            make_block(self.body, output);
-            return;
-        }
+        var b = self.body;
+        if (output.option("bracketize")
+            || !output.option("screw_ie8") && b instanceof AST_Do)
+            return make_block(b, output);
         // The squeezer replaces "block"-s that contain only a single
         // statement with the statement itself; technically, the AST
         // is correct, but this can create problems when we output an
@@ -1080,18 +1094,7 @@ function OutputStream(options) {
         // IF *without* an ELSE block (then the outer ELSE would refer
         // to the inner IF).  This function checks for this case and
         // adds the block brackets if needed.
-        if (!self.body)
-            return output.force_semicolon();
-        if (self.body instanceof AST_Do) {
-            // Unconditionally use the if/do-while workaround for all browsers.
-            // https://github.com/mishoo/UglifyJS/issues/#issue/57 IE
-            // croaks with "syntax error" on code like this: if (foo)
-            // do ... while(cond); else ...  we need block brackets
-            // around do/while
-            make_block(self.body, output);
-            return;
-        }
-        var b = self.body;
+        if (!b) return output.force_semicolon();
         while (true) {
             if (b instanceof AST_If) {
                 if (!b.alternative) {
@@ -1119,7 +1122,10 @@ function OutputStream(options) {
             output.space();
             output.print("else");
             output.space();
-            force_statement(self.alternative, output);
+            if (self.alternative instanceof AST_If)
+                self.alternative.print(output);
+            else
+                force_statement(self.alternative, output);
         } else {
             self._do_print_body(output);
         }
@@ -1497,15 +1503,27 @@ function OutputStream(options) {
     });
     DEFPRINT(AST_ObjectKeyVal, function(self, output){
         function get_name(self) {
-            var def = self.value.definition();
-            return def ? def.mangled_name || def.name : self.value.name;
+            var def = self.definition();
+            return def ? def.mangled_name || def.name : self.name;
         }
-        if (output.option("shorthand") &&
+
+        var allowShortHand = output.option("shorthand");
+        if (allowShortHand &&
             self.value instanceof AST_Symbol &&
             is_identifier_string(self.key) &&
-            get_name(self) === self.key
+            get_name(self.value) === self.key
         ) {
             self.print_property_name(self.key, self.quote, output);
+
+        } else if (allowShortHand &&
+            self.value instanceof AST_DefaultAssign &&
+            self.value.left instanceof AST_Symbol &&
+            is_identifier_string(self.key) &&
+            get_name(self.value.left) === self.key
+        ) {
+            self.print_property_name(self.key, self.quote, output);
+            output.print("=");
+            self.value.right.print(output);
         } else {
             if (!(self.key instanceof AST_Node)) {
                 self.print_property_name(self.key, self.quote, output);
@@ -1517,12 +1535,6 @@ function OutputStream(options) {
             output.colon();
             self.value.print(output);
         }
-        if (self.default) {
-            output.space();
-            output.print('=');
-            output.space();
-            self.default.print(output);
-        }
     });
     AST_ObjectProperty.DEFMETHOD("_print_getter_setter", function(type, self, output) {
         if (self.static) {
@@ -1573,12 +1585,6 @@ function OutputStream(options) {
     });
     DEFPRINT(AST_SymbolDeclaration, function(self, output){
         self._do_print(output);
-        if (self.default) {
-            output.space();
-            output.print('=');
-            output.space();
-            self.default.print(output)
-        }
     });
     DEFPRINT(AST_Undefined, function(self, output){
         output.print("void 0");
@@ -1658,15 +1664,7 @@ function OutputStream(options) {
 
     function force_statement(stat, output) {
         if (output.option("bracketize")) {
-            if (!stat || stat instanceof AST_EmptyStatement)
-                output.print("{}");
-            else if (stat instanceof AST_BlockStatement)
-                stat.print(output);
-            else output.with_block(function(){
-                output.indent();
-                stat.print(output);
-                output.newline();
-            });
+            make_block(stat, output);
         } else {
             if (!stat || stat instanceof AST_EmptyStatement)
                 output.force_semicolon();
@@ -1675,30 +1673,6 @@ function OutputStream(options) {
         }
     };
 
-    // 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(output) {
-        var a = output.stack(), i = a.length, node = a[--i], p = a[--i];
-        while (i > 0) {
-            if (p instanceof AST_Statement && p.body === node)
-                return true;
-            if ((p instanceof AST_Seq           && p.car === node        ) ||
-                (p instanceof AST_Call          && p.expression === node && !(p instanceof AST_New) ) ||
-                (p instanceof AST_Dot           && p.expression === node ) ||
-                (p instanceof AST_Sub           && p.expression === node ) ||
-                (p instanceof AST_Conditional   && p.condition === node  ) ||
-                (p instanceof AST_Binary        && p.left === node       ) ||
-                (p instanceof AST_UnaryPostfix  && p.expression === node ))
-            {
-                node = p;
-                p = a[--i];
-            } else {
-                return false;
-            }
-        }
-    };
-
     // self should be AST_New.  decide if we want to show parens or not.
     function need_constructor_parens(self, output) {
         // Always print parentheses with arguments
@@ -1739,11 +1713,11 @@ function OutputStream(options) {
     };
 
     function make_block(stmt, output) {
-        if (stmt instanceof AST_BlockStatement) {
+        if (!stmt || stmt instanceof AST_EmptyStatement)
+            output.print("{}");
+        else if (stmt instanceof AST_BlockStatement)
             stmt.print(output);
-            return;
-        }
-        output.with_block(function(){
+        else output.with_block(function(){
             output.indent();
             stmt.print(output);
             output.newline();

lib/parse.js

@@ -239,12 +239,11 @@ function JS_Parse_Error(message, filename, line, col, pos) {
     this.line = line;
     this.col = col;
     this.pos = pos;
-    this.stack = new Error().stack;
-};
-
-JS_Parse_Error.prototype.toString = function() {
-    return this.message + " (line: " + this.line + ", col: " + this.col + ", pos: " + this.pos + ")" + "\n\n" + this.stack;
 };
+JS_Parse_Error.prototype = Object.create(Error.prototype);
+JS_Parse_Error.prototype.constructor = JS_Parse_Error;
+JS_Parse_Error.prototype.name = "SyntaxError";
+configure_error_stack(JS_Parse_Error);
 
 function js_error(message, filename, line, col, pos) {
     throw new JS_Parse_Error(message, filename, line, col, pos);
@@ -335,7 +334,8 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
     function token(type, value, is_comment) {
         S.regex_allowed = ((type == "operator" && !UNARY_POSTFIX(value)) ||
                            (type == "keyword" && KEYWORDS_BEFORE_EXPRESSION(value)) ||
-                           (type == "punc" && PUNC_BEFORE_EXPRESSION(value)));
+                           (type == "punc" && PUNC_BEFORE_EXPRESSION(value))) ||
+                           (type == "arrow");
         prev_was_dot = (type == "punc" && value == ".");
         var ret = {
             type    : type,
@@ -403,13 +403,13 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
         });
         if (prefix) num = prefix + num;
         if (RE_OCT_NUMBER.test(num) && next_token.has_directive("use strict")) {
-            parse_error("SyntaxError: Legacy octal literals are not allowed in strict mode");
+            parse_error("Legacy octal literals are not allowed in strict mode");
         }
         var valid = parse_js_number(num);
         if (!isNaN(valid)) {
             return token("num", valid);
         } else {
-            parse_error("SyntaxError: Invalid syntax: " + num);
+            parse_error("Invalid syntax: " + num);
         }
     };
 
@@ -427,13 +427,13 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
             if (peek() == "{") {
                 next(true);
                 if (peek() === "}")
-                    parse_error("SyntaxError: Expecting hex-character between {}");
+                    parse_error("Expecting hex-character between {}");
                 while (peek() == "0") next(true); // No significance
                 var result, length = find("}", true) - S.pos;
                 // Avoid 32 bit integer overflow (1 << 32 === 1)
                 // We know first character isn't 0 and thus out of range anyway
                 if (length > 6 || (result = hex_bytes(length)) > 0x10FFFF) {
-                    parse_error("SyntaxError: Unicode reference out of bounce");
+                    parse_error("Unicode reference out of bounce");
                 }
                 next(true);
                 return from_char_code(result);
@@ -463,7 +463,7 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
         // Parse
         if (ch === "0") return "\0";
         if (ch.length > 0 && next_token.has_directive("use strict"))
-            parse_error("SyntaxError: Legacy octal escape sequences are not allowed in strict mode");
+            parse_error("Legacy octal escape sequences are not allowed in strict mode");
         return String.fromCharCode(parseInt(ch, 8));
     }
 
@@ -472,18 +472,18 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
         for (; n > 0; --n) {
             var digit = parseInt(next(true), 16);
             if (isNaN(digit))
-                parse_error("SyntaxError: Invalid hex-character pattern in string");
+                parse_error("Invalid hex-character pattern in string");
             num = (num << 4) | digit;
         }
         return num;
     };
 
-    var read_string = with_eof_error("SyntaxError: Unterminated string constant", function(quote_char){
+    var read_string = with_eof_error("Unterminated string constant", function(quote_char){
         var quote = next(), ret = "";
         for (;;) {
             var ch = next(true, true);
             if (ch == "\\") ch = read_escaped_char(true);
-            else if (NEWLINE_CHARS(ch)) parse_error("SyntaxError: Unterminated string constant");
+            else if (NEWLINE_CHARS(ch)) parse_error("Unterminated string constant");
             else if (ch == quote) break;
             ret += ch;
         }
@@ -492,7 +492,7 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
         return tok;
     });
 
-    var read_template_characters = with_eof_error("SyntaxError: Unterminated template", function(begin){
+    var read_template_characters = with_eof_error("Unterminated template", function(begin){
         if (begin) {
             S.template_braces.push(S.brace_counter);
         }
@@ -542,7 +542,7 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
         return next_token;
     };
 
-    var skip_multiline_comment = with_eof_error("SyntaxError: Unterminated multiline comment", function(){
+    var skip_multiline_comment = with_eof_error("Unterminated multiline comment", function(){
         var regex_allowed = S.regex_allowed;
         var i = find("*/", true);
         var text = S.text.substring(S.pos, i).replace(/\r\n|\r|\u2028|\u2029/g, '\n');
@@ -554,13 +554,13 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
         return next_token;
     });
 
-    var read_name = with_eof_error("SyntaxError: Unterminated identifier name", function() {
+    var read_name = with_eof_error("Unterminated identifier name", function() {
         var name = "", ch, escaped = false, hex;
         var read_escaped_identifier_char = function() {
             escaped = true;
             next();
             if (peek() !== "u") {
-                parse_error("SyntaxError: Expecting UnicodeEscapeSequence -- uXXXX or u{XXXX}");
+                parse_error("Expecting UnicodeEscapeSequence -- uXXXX or u{XXXX}");
             }
             return read_escaped_char();
         }
@@ -569,7 +569,7 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
         if ((name = peek()) === "\\") {
             name = read_escaped_identifier_char();
             if (!is_identifier_start(name)) {
-                parse_error("SyntaxError: First identifier char is an invalid identifier char");
+                parse_error("First identifier char is an invalid identifier char");
             }
         } else if (is_identifier_start(name)){
             next();
@@ -582,7 +582,7 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
             if ((ch = peek()) === "\\") {
                 ch = read_escaped_identifier_char();
                 if (!is_identifier_char(ch)) {
-                    parse_error("SyntaxError: Invalid escaped identifier char");
+                    parse_error("Invalid escaped identifier char");
                 }
             } else {
                 if (!is_identifier_char(ch)) {
@@ -593,15 +593,15 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
             name += ch;
         }
         if (RESERVED_WORDS(name) && escaped) {
-            parse_error("SyntaxError: Escaped characters are not allowed in keywords");
+            parse_error("Escaped characters are not allowed in keywords");
         }
         return name;
     });
 
-    var read_regexp = with_eof_error("SyntaxError: Unterminated regular expression", function(regexp){
+    var read_regexp = with_eof_error("Unterminated regular expression", function(regexp){
         var prev_backslash = false, ch, in_class = false;
         while ((ch = next(true))) if (NEWLINE_CHARS(ch)) {
-            parse_error("SyntaxError: Unexpected line terminator");
+            parse_error("Unexpected line terminator");
         } else if (prev_backslash) {
             regexp += "\\" + ch;
             prev_backslash = false;
@@ -622,7 +622,7 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
         try {
           return token("regexp", new RegExp(regexp, mods));
         } catch(e) {
-          parse_error("SyntaxError: " + e.message);
+          parse_error(e.message);
         }
     });
 
@@ -700,6 +700,11 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
     function next_token(force_regexp) {
         if (force_regexp != null)
             return read_regexp(force_regexp);
+        if (shebang && S.pos == 0 && looking_at("#!")) {
+            start_token();
+            forward(2);
+            skip_line_comment("comment5");
+        }
         for (;;) {
             skip_whitespace();
             start_token();
@@ -742,16 +747,9 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
             if (PUNC_CHARS(ch)) return token("punc", next());
             if (OPERATOR_CHARS(ch)) return read_operator();
             if (code == 92 || is_identifier_start(ch)) return read_word();
-            if (shebang) {
-                if (S.pos == 0 && looking_at("#!")) {
-                    forward(2);
-                    skip_line_comment("comment5");
-                    continue;
-                }
-            }
             break;
         }
-        parse_error("SyntaxError: Unexpected character '" + ch + "'");
+        parse_error("Unexpected character '" + ch + "'");
     };
 
     next_token.next = next;
@@ -913,14 +911,14 @@ function parse($TEXT, options) {
     function unexpected(token) {
         if (token == null)
             token = S.token;
-        token_error(token, "SyntaxError: Unexpected token: " + token.type + " (" + token.value + ")");
+        token_error(token, "Unexpected token: " + token.type + " (" + token.value + ")");
     };
 
     function expect_token(type, val) {
         if (is(type, val)) {
             return next();
         }
-        token_error(S.token, "SyntaxError: Unexpected token " + S.token.type + " «" + S.token.value + "»" + ", expected " + type + " «" + val + "»");
+        token_error(S.token, "Unexpected token " + S.token.type + " «" + S.token.value + "»" + ", expected " + type + " «" + val + "»");
     };
 
     function expect(punc) { return expect_token("punc", punc); };
@@ -1057,7 +1055,7 @@ function parse($TEXT, options) {
 
               case "return":
                 if (S.in_function == 0 && !options.bare_returns)
-                    croak("SyntaxError: 'return' outside of function");
+                    croak("'return' outside of function");
                 return new AST_Return({
                     value: ( is("punc", ";")
                              ? (next(), null)
@@ -1074,7 +1072,7 @@ function parse($TEXT, options) {
 
               case "throw":
                 if (S.token.nlb)
-                    croak("SyntaxError: Illegal newline after 'throw'");
+                    croak("Illegal newline after 'throw'");
                 return new AST_Throw({
                     value: (tmp = expression(true), semicolon(), tmp)
                 });
@@ -1093,7 +1091,7 @@ function parse($TEXT, options) {
 
               case "with":
                 if (S.input.has_directive("use strict")) {
-                    croak("SyntaxError: Strict mode may not include a with statement");
+                    croak("Strict mode may not include a with statement");
                 }
                 return new AST_With({
                     expression : parenthesised(),
@@ -1105,25 +1103,23 @@ function parse($TEXT, options) {
 
               case "export":
                 return export_();
-
-              default:
-                unexpected();
             }
         }
+        unexpected();
     });
 
     function labeled_statement() {
         var label = as_symbol(AST_Label);
         if (label.name === "yield" && is_in_generator()) {
             // Ecma-262, 12.1.1 Static Semantics: Early Errors
-            token_error(S.prev, "SyntaxError: Yield cannot be used as label inside generators");
+            token_error(S.prev, "Yield cannot be used as label inside generators");
         }
         if (find_if(function(l){ return l.name == label.name }, S.labels)) {
             // ECMA-262, 12.12: An ECMAScript program is considered
             // syntactically incorrect if it contains a
             // LabelledStatement that is enclosed by a
             // LabelledStatement with the same Identifier as label.
-            croak("SyntaxError: Label " + label.name + " defined twice");
+            croak("Label " + label.name + " defined twice");
         }
         expect(":");
         S.labels.push(label);
@@ -1136,7 +1132,7 @@ function parse($TEXT, options) {
             label.references.forEach(function(ref){
                 if (ref instanceof AST_Continue) {
                     ref = ref.label.start;
-                    croak("SyntaxError: Continue label `" + label.name + "` refers to non-IterationStatement.",
+                    croak("Continue label `" + label.name + "` refers to non-IterationStatement.",
                           ref.line, ref.col, ref.pos);
                 }
             });
@@ -1156,11 +1152,11 @@ function parse($TEXT, options) {
         if (label != null) {
             ldef = find_if(function(l){ return l.name == label.name }, S.labels);
             if (!ldef)
-                croak("SyntaxError: Undefined label " + label.name);
+                croak("Undefined label " + label.name);
             label.thedef = ldef;
         }
         else if (S.in_loop == 0)
-            croak("SyntaxError: " + type.TYPE + " not inside a loop or switch");
+            croak(type.TYPE + " not inside a loop or switch");
         semicolon();
         var stat = new type({ label: label });
         if (ldef) ldef.references.push(stat);
@@ -1181,7 +1177,7 @@ function parse($TEXT, options) {
             if (is_in || is_of) {
                 if ((init instanceof AST_Definitions) &&
                         init.definitions.length > 1)
-                    croak("SyntaxError: Only one variable declaration allowed in for..in loop");
+                    croak("Only one variable declaration allowed in for..in loop");
                 next();
                 if (is_in) {
                     return for_in(init);
@@ -1233,7 +1229,7 @@ function parse($TEXT, options) {
 
     var arrow_function = function(args) {
         if (S.token.nlb) {
-            croak("SyntaxError: Unexpected newline before arrow (=>)");
+            croak("Unexpected newline before arrow (=>)");
         }
 
         expect_token("arrow", "=>");
@@ -1303,7 +1299,7 @@ function parse($TEXT, options) {
                           case "eval":
                           case "yield":
                             if (strict_mode) {
-                                token_error(token, "SyntaxError: Unexpected " + token.value + " identifier as parameter inside strict mode");
+                                token_error(token, "Unexpected " + token.value + " identifier as parameter inside strict mode");
                             }
                             break;
                           default:
@@ -1332,7 +1328,7 @@ function parse($TEXT, options) {
             },
             check_strict: function() {
                 if (tracker.is_strict() && duplicate !== false) {
-                    token_error(duplicate, "SyntaxError: Parameter " + duplicate.value + " was used already");
+                    token_error(duplicate, "Parameter " + duplicate.value + " was used already");
                 }
             }
         };
@@ -1383,7 +1379,13 @@ function parse($TEXT, options) {
         if (is("operator", "=") && expand === false) {
             used_parameters.mark_default_assignment(S.token);
             next();
-            param.default = expression(false);
+            param = new AST_DefaultAssign({
+                start: param.start,
+                left: param,
+                operator: "=",
+                right: expression(false),
+                end: S.token
+            });
         }
 
         if (expand !== false) {
@@ -1452,12 +1454,18 @@ function parse($TEXT, options) {
                     }));
                     next();
                 } else {
-                    croak("SyntaxError: Invalid function parameter");
+                    croak("Invalid function parameter");
                 }
                 if (is("operator", "=") && is_expand === false) {
                     used_parameters.mark_default_assignment(S.token);
                     next();
-                    elements[elements.length - 1].default = expression(false);
+                    elements[elements.length - 1] = new AST_DefaultAssign({
+                        start: elements[elements.length - 1].start,
+                        left: elements[elements.length - 1],
+                        operator: "=",
+                        right: expression(false),
+                        end: S.token
+                    });
                 }
                 if (is_expand) {
                     if (!is("punc", "]")) {
@@ -1488,10 +1496,15 @@ function parse($TEXT, options) {
                 }
                 if (is("name") && (is_token(peek(), "punc") || is_token(peek(), "operator")) && [",", "}", "="].indexOf(peek().value) !== -1) {
                     used_parameters.add_parameter(S.token);
-                    elements.push(new symbol_type({
-                        start: S.token,
-                        name: S.token.value,
-                        end: S.token
+                    elements.push(new AST_ObjectKeyVal({
+                        start: prev(),
+                        key: S.token.value,
+                        value: new symbol_type({
+                            start: S.token,
+                            name: S.token.value,
+                            end: S.token
+                        }),
+                        end: prev()
                     }));
                     next();
                 } else if (is("punc", "}")) {
@@ -1502,9 +1515,14 @@ function parse($TEXT, options) {
                     if (property === null) {
                         unexpected(prev());
                     } else if (prev().type === "name" && !is("punc", ":")) {
-                        elements.push(new AST_SymbolFunarg({
+                        elements.push(new AST_ObjectKeyVal({
                             start: prev(),
-                            name: property_token,
+                            key: property,
+                            value: new symbol_type({
+                                start: prev(),
+                                name: property,
+                                end: prev()
+                            }),
                             end: prev()
                         }));
                     } else {
@@ -1512,16 +1530,22 @@ function parse($TEXT, options) {
                         elements.push(new AST_ObjectKeyVal({
                             start: property_token,
                             quote: property_token.quote,
-                            end: prev(),
                             key: property,
-                            value: binding_element(used_parameters, symbol_type)
+                            value: binding_element(used_parameters, symbol_type),
+                            end: prev()
                         }));
                     }
                 }
                 if (is("operator", "=")) {
                     used_parameters.mark_default_assignment(S.token);
                     next();
-                    elements[elements.length - 1].default = expression(false);
+                    elements[elements.length - 1].value = new AST_DefaultAssign({
+                        start: elements[elements.length - 1].value.start,
+                        left: elements[elements.length - 1].value,
+                        operator: "=",
+                        right: expression(false),
+                        end: S.token
+                    });
                 }
             }
             expect("}");
@@ -1541,7 +1565,7 @@ function parse($TEXT, options) {
                 end: prev()
             });
         } else {
-            croak("SyntaxError: Invalid function parameter");
+            croak("Invalid function parameter");
         }
     }
 
@@ -1557,7 +1581,7 @@ function parse($TEXT, options) {
                 next();
                 a.push(new AST_Expansion({
                     start: prev(),
-                    expression: binding_element(undefined, AST_SymbolFunarg),
+                    expression: expression(false),
                     end: S.token,
                 }));
                 if (!is("punc", ")")) {
@@ -1604,7 +1628,7 @@ function parse($TEXT, options) {
     function _yield_expression() {
         // Previous token must be keyword yield and not be interpret as an identifier
         if (!is_in_generator()) {
-            croak("SyntaxError: Unexpected yield expression outside generator function",
+            croak("Unexpected yield expression outside generator function",
                 S.prev.line, S.prev.col, S.prev.pos);
         }
         var star = false;
@@ -1720,7 +1744,7 @@ function parse($TEXT, options) {
             });
         }
         if (!bcatch && !bfinally)
-            croak("SyntaxError: Missing catch/finally blocks");
+            croak("Missing catch/finally blocks");
         return new AST_Try({
             body     : body,
             bcatch   : bcatch,
@@ -1845,7 +1869,7 @@ function parse($TEXT, options) {
             break;
           case "operator":
             if (!is_identifier_string(tok.value)) {
-                croak("SyntaxError: Invalid getter/setter name: " + tok.value,
+                croak("Invalid getter/setter name: " + tok.value,
                     tok.line, tok.col, tok.pos);
             }
             ret = _make_symbol(AST_SymbolRef);
@@ -1864,12 +1888,15 @@ function parse($TEXT, options) {
             switch (start.value) {
               case "(":
                 var ex = params_or_seq_();
-                ex.start = start;
-                ex.end = S.token;
                 if (is("arrow", "=>")) {
+                    ex.start = start;
+                    ex.end = S.token;
                     return arrow_function(ex);
                 }
-                return subscripts(ex.as_expr(croak), allow_calls);
+                ex = ex.as_expr(croak);
+                ex.start = start;
+                ex.end = S.token;
+                return subscripts(ex, allow_calls);
               case "[":
                 return subscripts(array_(), allow_calls);
               case "{":
@@ -1942,7 +1969,7 @@ function parse($TEXT, options) {
                 a.push(new AST_Hole({ start: S.token, end: S.token }));
             } else if (is("expand", "...")) {
                 next();
-                a.push(new AST_Expansion({start: S.token, expression: expression(),end: S.token}));
+                a.push(new AST_Expansion({start: prev(), expression: expression(),end: S.token}));
             } else {
                 a.push(expression(false));
             }
@@ -1958,6 +1985,10 @@ function parse($TEXT, options) {
         });
     });
 
+    var create_accessor = embed_tokens(function(is_generator) {
+        return function_(AST_Accessor, is_generator);
+    });
+
     var object_or_object_destructuring_ = embed_tokens(function() {
         var start = S.token, first = true, a = [];
         expect("{");
@@ -1969,63 +2000,51 @@ function parse($TEXT, options) {
             start = S.token;
             var type = start.type;
             var name = as_property_name();
+            var value;
+
+            // Check property and fetch value
             if (!is("punc", ":")) {
                 var concise = concise_method_or_getset(name, start);
                 if (concise) {
                     a.push(concise);
                     continue;
                 }
+                if (!(start.type !== name)) {
+                    unexpected(S.token);
+                }
+
+                value = new AST_SymbolRef({
+                    start: prev(),
+                    name: name,
+                    end: prev()
+                });
             } else if (name === null) {
                 unexpected(prev());
+            } else {
+                next(); // `:` - see first condition
+                value = expression(false);
             }
 
-            if (type == "punc" && start.value == "[") {
-                expect(":");
-                a.push(new AST_ObjectKeyVal({
-                    start: start,
-                    key: name,
-                    value: expression(false),
-                    end: prev()
-                }));
-                continue;
-            }
-
+            // Check for default value and alter value accordingly if necessary
             if (is("operator", "=")) {
                 next();
-                a.push(new AST_Assign({
+                value = new AST_Assign({
                     start: start,
-                    // Symbol class doesn't matter. This is only meant to carry the symbol name into .as_params() since this is not normally valid.
-                    left: new AST_SymbolRef({
-                        start: start,
-                        end: start,
-                        name: name
-                    }),
+                    left: value,
                     operator: "=",
                     right: expression(false),
                     end: prev()
-                }));
-            } else if (!is("punc", ":")) {
-                // It's one of those object destructurings, the value is its own name
-                a.push(new AST_ObjectKeyVal({
-                    start: start,
-                    key: name,
-                    value: new AST_SymbolRef({
-                        start: start,
-                        end: prev(),
-                        name: name
-                    }),
-                    end: start,
-                }));
-            } else {
-                expect(":");
-                a.push(new AST_ObjectKeyVal({
-                    start : start,
-                    quote : start.quote,
-                    key   : name,
-                    value : expression(false),
-                    end   : prev()
-                }));
+                });
             }
+
+            // Create property
+            a.push(new AST_ObjectKeyVal({
+                start: start,
+                quote: start.quote,
+                key: name,
+                value: value,
+                end: prev()
+            }));
         }
         next();
         return new AST_Object({ properties: a })
@@ -2112,7 +2131,7 @@ function parse($TEXT, options) {
                 key         : name,
                 quote       : name instanceof AST_SymbolMethod ?
                               property_token.quote : undefined,
-                value       : function_(AST_Accessor, is_generator),
+                value       : create_accessor(is_generator),
                 end         : prev()
             });
             return node;
@@ -2127,7 +2146,7 @@ function parse($TEXT, options) {
                     key   : name,
                     quote : name instanceof AST_SymbolMethod ?
                             property_token.quote : undefined,
-                    value : function_(AST_Accessor),
+                    value : create_accessor(),
                     end   : prev()
                 });
             }
@@ -2141,7 +2160,7 @@ function parse($TEXT, options) {
                     key   : name,
                     quote : name instanceof AST_SymbolMethod ?
                             property_token.quote : undefined,
-                    value : function_(AST_Accessor),
+                    value : create_accessor(),
                     end   : prev()
                 });
             }
@@ -2271,7 +2290,7 @@ function parse($TEXT, options) {
             }
           case "name":
             if (tmp.value === "yield" && S.input.has_directive("use strict") && !is_in_generator()) {
-                token_error(tmp, "SyntaxError: Unexpected yield identifier inside strict mode");
+                token_error(tmp, "Unexpected yield identifier inside strict mode");
             }
           case "string":
           case "num":
@@ -2310,11 +2329,11 @@ function parse($TEXT, options) {
 
     function as_symbol(type, noerror) {
         if (!is("name")) {
-            if (!noerror) croak("SyntaxError: Name expected");
+            if (!noerror) croak("Name expected");
             return null;
         }
         if (is("name", "yield") && S.input.has_directive("use strict")) {
-            token_error(S.prev, "SyntaxError: Unexpected yield identifier inside strict mode");
+            token_error(S.prev, "Unexpected yield identifier inside strict mode");
         }
         var sym = _make_symbol(type);
         next();
@@ -2403,7 +2422,7 @@ function parse($TEXT, options) {
 
     function make_unary(ctor, op, expr) {
         if ((op == "++" || op == "--") && !is_assignable(expr))
-            croak("SyntaxError: Invalid use of " + op + " operator");
+            croak("Invalid use of " + op + " operator");
         return new ctor({ operator: op, expression: expr });
     };
 
@@ -2467,7 +2486,7 @@ function parse($TEXT, options) {
                 next();
                 return _yield_expression();
             } else if (S.input.has_directive("use strict")) {
-                token_error(S.token, "SyntaxError: Unexpected yield identifier inside strict mode")
+                token_error(S.token, "Unexpected yield identifier inside strict mode")
             }
         }
 
@@ -2492,6 +2511,55 @@ function parse($TEXT, options) {
 
         if (is("operator") && ASSIGNMENT(val)) {
             if (is_assignable(left)) {
+
+                var walk = function(node) {
+                    var newNode;
+                    if (node instanceof AST_Object) {
+                        newNode = new AST_Destructuring({
+                            start: node.start,
+                            names: node.properties.map(walk),
+                            is_array: false,
+                            end: node.end
+                        });
+                        node = newNode;
+                    } else if (node instanceof AST_Array) {
+                        var names = [];
+
+                        for (var i = 0; i < node.elements.length; i++) {
+                            // Only allow expansion as last element
+                            if (node.elements[i] instanceof AST_Expansion) {
+                                if (i + 1 !== node.elements.length) {
+                                    token_error(node.elements[i].start, "Spread must the be last element in destructuring array");
+                                }
+                                node.elements[i].expression = walk(node.elements[i].expression);
+                            }
+
+                            names.push(walk(node.elements[i]));
+                        }
+
+                        newNode = new AST_Destructuring({
+                            start: node.start,
+                            names: names,
+                            is_array: true,
+                            end: node.end
+                        });
+                        node = newNode;
+                    } else if (node instanceof AST_ObjectProperty) {
+                        node.value = walk(node.value);
+                    } else if (node instanceof AST_Assign) {
+                        node = new AST_DefaultAssign({
+                            start: node.start,
+                            left: node.left,
+                            operator: "=",
+                            right: node.right,
+                            end: node.end
+                        });
+                    }
+
+                    return node;
+                }
+                left = walk(left);
+
                 next();
                 return new AST_Assign({
                     start    : start,
@@ -2501,7 +2569,7 @@ function parse($TEXT, options) {
                     end      : prev()
                 });
             }
-            croak("SyntaxError: Invalid assignment");
+            croak("Invalid assignment");
         }
         return left;
     };

lib/propmangle.js

@@ -174,6 +174,7 @@ function mangle_properties(ast, options) {
     // only function declarations after this line
 
     function can_mangle(name) {
+        if (!is_identifier(name)) return false;
         if (unmangleable.indexOf(name) >= 0) return false;
         if (reserved.indexOf(name) >= 0) return false;
         if (options.only_cache) {

lib/scope.js

@@ -53,7 +53,6 @@ function SymbolDef(scope, index, orig) {
     this.mangled_name = null;
     this.object_destructuring_arg = false;
     this.undeclared = false;
-    this.constant = false;
     this.index = index;
     this.id = SymbolDef.next_id++;
 };
@@ -105,15 +104,14 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
     var scope = self.parent_scope = null;
     var labels = new Dictionary();
     var defun = null;
-    var last_var_had_const_pragma = false;
-    var nesting = 0;
     var in_destructuring = null;
-    var in_export;
+    var in_export = false;
+    var in_block = 0;
     var tw = new TreeWalker(function(node, descend){
         if (node.is_block_scope()) {
             var save_scope = scope;
             scope = new AST_Scope(node);
-            scope.init_scope_vars(nesting);
+            scope.init_scope_vars();
             scope.parent_scope = save_scope;
             if (!(node instanceof AST_Scope)) {
                 scope.uses_with = save_scope.uses_with;
@@ -131,13 +129,13 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
             return true;
         }
         if (node instanceof AST_Scope) {
-            node.init_scope_vars(nesting);
+            node.init_scope_vars();
             var save_scope = node.parent_scope = scope;
             var save_defun = defun;
             var save_labels = labels;
             defun = scope = node;
             labels = new Dictionary();
-            ++nesting; descend(); --nesting;
+            descend();
             scope = save_scope;
             defun = save_defun;
             labels = save_labels;
@@ -147,6 +145,17 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
             in_export = true;
             descend();
             in_export = false;
+            return true;
+        }
+        if (node instanceof AST_BlockStatement
+            || node instanceof AST_Switch
+            || node instanceof AST_Try
+            || node instanceof AST_Catch
+            || node instanceof AST_Finally) {
+            in_block++;
+            descend();
+            in_block--;
+            return true;
         }
         if (node instanceof AST_LabeledStatement) {
             var l = node.label;
@@ -168,14 +177,13 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
         }
         if (node instanceof AST_SymbolFunarg) {
             node.object_destructuring_arg = !!in_destructuring;
-            defun.def_variable(node, in_export);
         }
         if (node instanceof AST_Label) {
             node.thedef = node;
             node.references = [];
         }
         if (node instanceof AST_SymbolLambda) {
-            defun.def_function(node, in_export);
+            defun.def_function(node, in_export, in_block);
         }
         else if (node instanceof AST_SymbolDefun) {
             // Careful here, the scope where this should be defined is
@@ -187,33 +195,27 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
             while (parent_lambda.is_block_scope()) {
                 parent_lambda = parent_lambda.parent_scope;
             }
-            (node.scope = parent_lambda).def_function(node, in_export);
+            (node.scope = parent_lambda).def_function(node, in_export, in_block);
         }
         else if (node instanceof AST_SymbolClass) {
-            defun.def_variable(node, in_export);
+            defun.def_variable(node, in_export, in_block);
         }
         else if (node instanceof AST_SymbolImport) {
-            scope.def_variable(node, in_export);
+            scope.def_variable(node, in_export, in_block);
         }
         else if (node instanceof AST_SymbolDefClass) {
             // This deals with the name of the class being available
             // inside the class.
-            (node.scope = defun.parent_scope).def_function(node, in_export);
-        }
-        else if (node instanceof AST_Var) {
-            last_var_had_const_pragma = node.has_const_pragma();
+            (node.scope = defun.parent_scope).def_function(node, in_export, in_block);
         }
         else if (node instanceof AST_SymbolVar
-                 || node instanceof AST_SymbolConst
-                 || node instanceof AST_SymbolLet) {
-            var def = ((node instanceof AST_SymbolBlockDeclaration) ? scope : defun).def_variable(node, in_export);
-            def.constant = node instanceof AST_SymbolConst || last_var_had_const_pragma;
+            || node instanceof AST_SymbolLet
+            || node instanceof AST_SymbolConst) {
+            var def = ((node instanceof AST_SymbolBlockDeclaration) ? scope : defun).def_variable(node, in_export, in_block);
             def.destructuring = in_destructuring;
-            def.init = tw.parent().value;
         }
         else if (node instanceof AST_SymbolCatch) {
-            (options.screw_ie8 ? scope : defun)
-                .def_variable(node);
+            scope.def_variable(node, in_export, in_block);
         }
         else if (node instanceof AST_LabelRef) {
             var sym = labels.get(node.name);
@@ -252,8 +254,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
         }
         if (node instanceof AST_SymbolRef) {
             var name = node.name;
-            var parent = tw.parent();
-            if (name == "eval" && parent instanceof AST_Call) {
+            if (name == "eval" && tw.parent() instanceof AST_Call) {
                 for (var s = node.scope; s && !s.uses_eval; s = s.parent_scope) {
                     s.uses_eval = true;
                 }
@@ -263,34 +264,52 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
                 node.scope.uses_arguments = true;
             }
             if (!sym) {
-                var g;
-                if (globals.has(name)) {
-                    g = globals.get(name);
-                } else {
-                    g = new SymbolDef(self, globals.size(), node);
-                    g.undeclared = true;
-                    g.global = true;
-                    globals.set(name, g);
-                }
-                sym = g;
+                sym = self.def_global(node);
             }
             node.thedef = sym;
-            if (parent instanceof AST_Unary && (parent.operator === '++' || parent.operator === '--')
-             || parent instanceof AST_Assign && parent.left === node) {
-                sym.modified = true;
-            }
-            node.reference();
+            node.reference(options);
             return true;
         }
     });
     self.walk(tw);
 
+    // pass 3: fix up any scoping issue with IE8
+    if (!options.screw_ie8) {
+        self.walk(new TreeWalker(function(node, descend) {
+            if (node instanceof AST_SymbolCatch) {
+                var name = node.name;
+                var refs = node.thedef.references;
+                var scope = node.thedef.scope.parent_scope;
+                var def = scope.find_variable(name) || self.globals.get(name) || scope.def_variable(node);
+                refs.forEach(function(ref) {
+                    ref.thedef = def;
+                    ref.reference(options);
+                });
+                node.thedef = def;
+                return true;
+            }
+        }));
+    }
+
     if (options.cache) {
         this.cname = options.cache.cname;
     }
 });
 
-AST_Scope.DEFMETHOD("init_scope_vars", function(nesting){
+AST_Toplevel.DEFMETHOD("def_global", function(node){
+    var globals = this.globals, name = node.name;
+    if (globals.has(name)) {
+        return globals.get(name);
+    } else {
+        var g = new SymbolDef(this, globals.size(), node);
+        g.undeclared = true;
+        g.global = true;
+        globals.set(name, g);
+        return g;
+    }
+});
+
+AST_Scope.DEFMETHOD("init_scope_vars", function(){
     this.variables = new Dictionary(); // map name to AST_SymbolVar (variables defined in this scope; includes functions)
     this.functions = new Dictionary(); // map name to AST_SymbolDefun (functions defined in this scope)
     this.uses_with = false;   // will be set to true if this or some nested scope uses the `with` statement
@@ -298,7 +317,6 @@ AST_Scope.DEFMETHOD("init_scope_vars", function(nesting){
     this.parent_scope = null; // the parent scope
     this.enclosed = [];       // a list of variables from this or outer scope(s) that are referenced from this or inner scopes
     this.cname = -1;          // the current index for mangling functions/variables
-    this.nesting = nesting;   // the nesting level of this scope (0 means toplevel)
 });
 
 AST_Node.DEFMETHOD("is_block_scope", function(){
@@ -314,6 +332,10 @@ AST_Block.DEFMETHOD("is_block_scope", function(){
     );
 });
 
+AST_IterationStatement.DEFMETHOD("is_block_scope", function(){
+     return true;
+});
+
 AST_Lambda.DEFMETHOD("init_scope_vars", function(){
     AST_Scope.prototype.init_scope_vars.apply(this, arguments);
     this.uses_arguments = false;
@@ -323,16 +345,20 @@ AST_Lambda.DEFMETHOD("init_scope_vars", function(){
     this.variables.set(symbol.name, def);
 });
 
-AST_SymbolRef.DEFMETHOD("reference", function() {
+AST_SymbolRef.DEFMETHOD("reference", function(options) {
     var def = this.definition();
     def.references.push(this);
     var s = this.scope;
     while (s) {
         push_uniq(s.enclosed, def);
+        if (options.keep_fnames) {
+            s.functions.each(function(d) {
+                push_uniq(def.scope.enclosed, d);
+            });
+        }
         if (s === def.scope) break;
         s = s.parent_scope;
     }
-    this.frame = this.scope.nesting - def.scope.nesting;
 });
 
 AST_Scope.DEFMETHOD("find_variable", function(name){
@@ -341,11 +367,11 @@ AST_Scope.DEFMETHOD("find_variable", function(name){
         || (this.parent_scope && this.parent_scope.find_variable(name));
 });
 
-AST_Scope.DEFMETHOD("def_function", function(symbol, in_export){
-    this.functions.set(symbol.name, this.def_variable(symbol, in_export));
+AST_Scope.DEFMETHOD("def_function", function(symbol, in_export, in_block){
+    this.functions.set(symbol.name, this.def_variable(symbol, in_export, in_block));
 });
 
-AST_Scope.DEFMETHOD("def_variable", function(symbol, in_export){
+AST_Scope.DEFMETHOD("def_variable", function(symbol, in_export, in_block){
     var def;
     if (!this.variables.has(symbol.name)) {
         def = new SymbolDef(this, this.variables.size(), symbol);
@@ -354,7 +380,11 @@ AST_Scope.DEFMETHOD("def_variable", function(symbol, in_export){
         if (in_export) {
             def.export = true;
         }
-        def.global = !this.parent_scope && !(symbol instanceof AST_SymbolBlockDeclaration);
+        if (in_block && symbol instanceof AST_SymbolBlockDeclaration) {
+            def.global = false;
+        } else {
+            def.global = !this.parent_scope;
+        }
     } else {
         def = this.variables.get(symbol.name);
         def.orig.push(symbol);
@@ -401,11 +431,6 @@ AST_Function.DEFMETHOD("next_mangled", function(options, def){
     }
 });
 
-AST_Scope.DEFMETHOD("references", function(sym){
-    if (sym instanceof AST_Symbol) sym = sym.definition();
-    return this.enclosed.indexOf(sym) < 0 ? null : sym;
-});
-
 AST_Symbol.DEFMETHOD("unmangleable", function(options){
     var def = this.definition();
     return def && def.unmangleable(options);
@@ -446,12 +471,6 @@ AST_Symbol.DEFMETHOD("global", function(){
     return this.definition().global;
 });
 
-AST_Var.DEFMETHOD("has_const_pragma", function() {
-    var comments_before = this.start && this.start.comments_before;
-    var lastComment = comments_before && comments_before[comments_before.length - 1];
-    return lastComment && /@const\b/.test(lastComment.value);
-});
-
 AST_Toplevel.DEFMETHOD("_default_mangler_options", function(options){
     return defaults(options, {
         except      : [],

lib/utils.js

@@ -78,13 +78,28 @@ function repeat_string(str, i) {
     return d;
 };
 
+function configure_error_stack(fn) {
+    Object.defineProperty(fn.prototype, "stack", {
+        get: function() {
+            var err = new Error(this.message);
+            err.name = this.name;
+            try {
+                throw err;
+            } catch(e) {
+                return e.stack;
+            }
+        }
+    });
+}
+
 function DefaultsError(msg, defs) {
-    Error.call(this, msg);
-    this.msg = msg;
+    this.message = msg;
     this.defs = defs;
 };
 DefaultsError.prototype = Object.create(Error.prototype);
 DefaultsError.prototype.constructor = DefaultsError;
+DefaultsError.prototype.name = "DefaultsError";
+configure_error_stack(DefaultsError);
 
 DefaultsError.croak = function(msg, defs) {
     throw new DefaultsError(msg, defs);
@@ -170,7 +185,7 @@ function push_uniq(array, el) {
 
 function string_template(text, props) {
     return text.replace(/\{(.+?)\}/g, function(str, p){
-        return props[p];
+        return props && props[p];
     });
 };
 
@@ -320,3 +335,26 @@ Dictionary.fromObject = function(obj) {
 function HOP(obj, prop) {
     return Object.prototype.hasOwnProperty.call(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) {
+    var node = stack.parent(-1);
+    for (var i = 0, p; p = stack.parent(i); i++) {
+        if (p instanceof AST_Statement && p.body === node)
+            return true;
+        if ((p instanceof AST_Seq           && p.car === node        ) ||
+            (p instanceof AST_Call          && p.expression === node && !(p instanceof AST_New) ) ||
+            (p instanceof AST_Dot           && p.expression === node ) ||
+            (p instanceof AST_Sub           && p.expression === node ) ||
+            (p instanceof AST_Conditional   && p.condition === node  ) ||
+            (p instanceof AST_Binary        && p.left === node       ) ||
+            (p instanceof AST_UnaryPostfix  && p.expression === node ))
+        {
+            node = p;
+        } else {
+            return false;
+        }
+    }
+}

npm-shrinkwrap.json

@@ -1,128 +0,0 @@
-{
-  "name": "uglify-js",
-  "version": "2.4.24",
-  "dependencies": {
-    "abbrev": {
-      "version": "1.0.7",
-      "from": "abbrev@>=1.0.0 <2.0.0",
-      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.0.7.tgz"
-    },
-    "amdefine": {
-      "version": "1.0.0",
-      "from": "amdefine@>=0.0.4",
-      "resolved": "https://registry.npmjs.org/amdefine/-/amdefine-1.0.0.tgz"
-    },
-    "async": {
-      "version": "0.2.10",
-      "from": "async@>=0.2.6 <0.3.0",
-      "resolved": "https://registry.npmjs.org/async/-/async-0.2.10.tgz"
-    },
-    "camelcase": {
-      "version": "1.2.1",
-      "from": "camelcase@>=1.0.2 <2.0.0",
-      "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-1.2.1.tgz"
-    },
-    "decamelize": {
-      "version": "1.0.0",
-      "from": "decamelize@>=1.0.0 <2.0.0",
-      "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.0.0.tgz"
-    },
-    "deep-is": {
-      "version": "0.1.3",
-      "from": "deep-is@>=0.1.2 <0.2.0",
-      "resolved": "https://registry.npmjs.org/deep-is/-/deep-is-0.1.3.tgz"
-    },
-    "esprima": {
-      "version": "1.1.1",
-      "from": "esprima@>=1.1.1 <1.2.0",
-      "resolved": "https://registry.npmjs.org/esprima/-/esprima-1.1.1.tgz"
-    },
-    "estraverse": {
-      "version": "1.5.1",
-      "from": "estraverse@>=1.5.1 <1.6.0",
-      "resolved": "https://registry.npmjs.org/estraverse/-/estraverse-1.5.1.tgz"
-    },
-    "esutils": {
-      "version": "1.0.0",
-      "from": "esutils@>=1.0.0 <1.1.0",
-      "resolved": "https://registry.npmjs.org/esutils/-/esutils-1.0.0.tgz"
-    },
-    "fast-levenshtein": {
-      "version": "1.0.7",
-      "from": "fast-levenshtein@>=1.0.0 <1.1.0",
-      "resolved": "https://registry.npmjs.org/fast-levenshtein/-/fast-levenshtein-1.0.7.tgz"
-    },
-    "levn": {
-      "version": "0.2.5",
-      "from": "levn@>=0.2.5 <0.3.0",
-      "resolved": "https://registry.npmjs.org/levn/-/levn-0.2.5.tgz"
-    },
-    "nopt": {
-      "version": "2.1.2",
-      "from": "nopt@>=2.1.2 <2.2.0",
-      "resolved": "https://registry.npmjs.org/nopt/-/nopt-2.1.2.tgz"
-    },
-    "optionator": {
-      "version": "0.5.0",
-      "from": "optionator@>=0.5.0 <0.6.0",
-      "resolved": "https://registry.npmjs.org/optionator/-/optionator-0.5.0.tgz"
-    },
-    "prelude-ls": {
-      "version": "1.1.2",
-      "from": "prelude-ls@>=1.1.1 <1.2.0",
-      "resolved": "https://registry.npmjs.org/prelude-ls/-/prelude-ls-1.1.2.tgz"
-    },
-    "reflect": {
-      "version": "0.1.3",
-      "from": "git://github.com/zaach/reflect.js.git",
-      "resolved": "git://github.com/zaach/reflect.js.git#286bcd79661c96ecc404357d3c0e35fdb54a6967"
-    },
-    "source-map": {
-      "version": "0.5.1",
-      "from": "source-map@>=0.5.1 <0.6.0",
-      "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.5.1.tgz"
-    },
-    "type-check": {
-      "version": "0.3.1",
-      "from": "type-check@>=0.3.1 <0.4.0",
-      "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.3.1.tgz"
-    },
-    "uglify-js": {
-      "version": "2.4.24",
-      "from": "git://github.com/mishoo/UglifyJS2.git",
-      "resolved": "git://github.com/mishoo/UglifyJS2.git#2a06c7758e24a64740473c8031eafbb7fefa213f",
-      "dependencies": {
-        "source-map": {
-          "version": "0.1.34",
-          "from": "source-map@0.1.34",
-          "resolved": "https://registry.npmjs.org/source-map/-/source-map-0.1.34.tgz"
-        }
-      }
-    },
-    "uglify-to-browserify": {
-      "version": "1.0.2",
-      "from": "uglify-to-browserify@>=1.0.0 <1.1.0",
-      "resolved": "https://registry.npmjs.org/uglify-to-browserify/-/uglify-to-browserify-1.0.2.tgz"
-    },
-    "window-size": {
-      "version": "0.1.0",
-      "from": "window-size@0.1.0",
-      "resolved": "https://registry.npmjs.org/window-size/-/window-size-0.1.0.tgz"
-    },
-    "wordwrap": {
-      "version": "0.0.2",
-      "from": "wordwrap@0.0.2",
-      "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.2.tgz"
-    },
-    "yargs": {
-      "version": "3.10.0",
-      "from": "yargs@>=3.10.0 <3.11.0",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz"
-    },
-    "zeparser": {
-      "version": "0.0.7",
-      "from": "git://github.com/qfox/ZeParser.git",
-      "resolved": "git://github.com/qfox/ZeParser.git#c99240c5ba7054c467733800ff38265958a2dda9"
-    }
-  }
-}

package.json

@@ -4,7 +4,7 @@
   "homepage": "http://lisperator.net/uglifyjs",
   "author": "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)",
   "license": "BSD-2-Clause",
-  "version": "2.7.5",
+  "version": "2.8.11",
   "engines": {
     "node": ">=0.8.0"
   },
@@ -29,7 +29,6 @@
     "LICENSE"
   ],
   "dependencies": {
-    "async": "~0.2.6",
     "source-map": "~0.5.1",
     "uglify-to-browserify": "~1.0.0",
     "yargs": "~3.10.0"

test/benchmark.js

@@ -0,0 +1,80 @@
+#! /usr/bin/env node
+// -*- js -*-
+
+"use strict";
+
+var createHash = require("crypto").createHash;
+var fork = require("child_process").fork;
+var args = process.argv.slice(2);
+if (!args.length) {
+    args.push("-mc", "warnings=false");
+}
+args.push("--stats");
+var urls = [
+    "https://code.jquery.com/jquery-3.1.1.js",
+    "https://code.angularjs.org/1.6.1/angular.js",
+    "https://cdnjs.cloudflare.com/ajax/libs/mathjs/3.9.0/math.js",
+    "https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.js",
+    "https://unpkg.com/react@15.3.2/dist/react.js",
+    "http://builds.emberjs.com/tags/v2.11.0/ember.prod.js",
+    "https://cdn.jsdelivr.net/lodash/4.17.4/lodash.js",
+    "https://cdnjs.cloudflare.com/ajax/libs/d3/4.5.0/d3.js",
+];
+var results = {};
+var remaining = 2 * urls.length;
+function done() {
+    if (!--remaining) {
+        var failures = [];
+        urls.forEach(function(url) {
+            var info = results[url];
+            console.log();
+            console.log(url);
+            console.log(info.log);
+            var elapsed = 0;
+            info.log.replace(/: ([0-9]+\.[0-9]{3})s/g, function(match, time) {
+                elapsed += parseFloat(time);
+            });
+            console.log("Run-time:", elapsed.toFixed(3), "s");
+            console.log("Original:", info.input, "bytes");
+            console.log("Uglified:", info.output, "bytes");
+            console.log("SHA1 sum:", info.sha1);
+            if (info.code) {
+                failures.push(url);
+            }
+        });
+        if (failures.length) {
+            console.error("Benchmark failed:");
+            failures.forEach(function(url) {
+                console.error(url);
+            });
+            process.exit(1);
+        }
+    }
+}
+urls.forEach(function(url) {
+    results[url] = {
+        input: 0,
+        output: 0,
+        log: ""
+    };
+    require(url.slice(0, url.indexOf(":"))).get(url, function(res) {
+        var uglifyjs = fork("bin/uglifyjs", args, { silent: true });
+        res.on("data", function(data) {
+            results[url].input += data.length;
+        }).pipe(uglifyjs.stdin);
+        uglifyjs.stdout.on("data", function(data) {
+            results[url].output += data.length;
+        }).pipe(createHash("sha1")).on("data", function(data) {
+            results[url].sha1 = data.toString("hex");
+            done();
+        });
+        uglifyjs.stderr.setEncoding("utf8");
+        uglifyjs.stderr.on("data", function(data) {
+            results[url].log += data;
+        });
+        uglifyjs.on("exit", function(code) {
+            results[url].code = code;
+            done();
+        });
+    });
+});

test/compress/arrays.js

@@ -23,10 +23,19 @@ constant_join: {
     input: {
         var a = [ "foo", "bar", "baz" ].join("");
         var a1 = [ "foo", "bar", "baz" ].join();
+        var a2 = [ "foo", "bar", "baz" ].join(null);
+        var a3 = [ "foo", "bar", "baz" ].join(void 0);
+        var a4 = [ "foo", , "baz" ].join();
+        var a5 = [ "foo", null, "baz" ].join();
+        var a6 = [ "foo", void 0, "baz" ].join();
         var b = [ "foo", 1, 2, 3, "bar" ].join("");
         var c = [ boo(), "foo", 1, 2, 3, "bar", bar() ].join("");
         var c1 = [ boo(), bar(), "foo", 1, 2, 3, "bar", bar() ].join("");
         var c2 = [ 1, 2, "foo", "bar", baz() ].join("");
+        var c3 = [ boo() + bar() + "foo", 1, 2, 3, "bar", bar() + "foo" ].join("");
+        var c4 = [ 1, 2, null, undefined, "foo", "bar", baz() ].join("");
+        var c5 = [ boo() + bar() + "foo", 1, 2, 3, "bar", bar() + "foo" ].join();
+        var c6 = [ 1, 2, null, undefined, "foo", "bar", baz() ].join();
         var d = [ "foo", 1 + 2 + "bar", "baz" ].join("-");
         var e = [].join(foo + bar);
         var f = [].join("");
@@ -35,10 +44,19 @@ constant_join: {
     expect: {
         var a = "foobarbaz";
         var a1 = "foo,bar,baz";
+        var a2 = "foonullbarnullbaz";
+        var a3 = "foo,bar,baz";
+        var a4 = "foo,,baz";
+        var a5 = "foo,,baz";
+        var a6 = "foo,,baz";
         var b = "foo123bar";
         var c = boo() + "foo123bar" + bar();
         var c1 = "" + boo() + bar() + "foo123bar" + bar();
         var c2 = "12foobar" + baz();
+        var c3 = boo() + bar() + "foo123bar" + bar() + "foo";
+        var c4 = "12foobar" + baz();
+        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 f = "";
@@ -146,4 +164,89 @@ spread_with_logical_expression_at_middle: {
     expect: {
         var a = [1, 1, ...[2, 3, 5], 8]
     }
-}
+}
+
+constant_join_3: {
+    options = {
+        unsafe: true,
+        evaluate: true,
+    };
+    input: {
+        var a = [ null ].join();
+        var b = [ , ].join();
+        var c = [ , 1, , 3 ].join();
+        var d = [ foo ].join();
+        var e = [ foo, null, undefined, bar ].join("-");
+        var f = [ foo, bar ].join("");
+        var g = [ null, "foo", null, bar + "baz" ].join("");
+        var h = [ null, "foo", null, bar + "baz" ].join("-");
+        var i = [ "foo" + bar, null, baz + "moo" ].join("");
+        var j = [ foo + "bar", baz ].join("");
+        var k = [ foo, "bar" + baz ].join("");
+        var l = [ foo, bar + "baz" ].join("");
+    }
+    expect: {
+        var a = "";
+        var b = "";
+        var c = ",1,,3";
+        var d = "" + foo;
+        var e = [ foo, "-", bar ].join("-");
+        var f = "" + foo + bar;
+        var g = "foo" + bar + "baz";
+        var h = [ "-foo-", bar + "baz" ].join("-");
+        var i = "foo" + bar + baz + "moo";
+        var j = foo + "bar" + baz;
+        var k = foo + "bar" + baz;
+        var l = foo + (bar + "baz");
+    }
+}
+
+for_loop: {
+    options = {
+        unsafe      : true,
+        unused      : true,
+        evaluate    : true,
+        reduce_vars : true
+    };
+    input: {
+        function f0() {
+            var a = [1, 2, 3];
+            for (var i = 0; i < a.length; i++) {
+                console.log(a[i]);
+            }
+        }
+
+        function f1() {
+            var a = [1, 2, 3];
+            for (var i = 0, len = a.length; i < len; i++) {
+                console.log(a[i]);
+            }
+        }
+
+        function f2() {
+            var a = [1, 2, 3];
+            for (var i = 0; i < a.length; i++) {
+                a[i]++;
+            }
+        }
+    }
+    expect: {
+        function f0() {
+            var a = [1, 2, 3];
+            for (var i = 0; i < 3; i++)
+                console.log(a[i]);
+        }
+
+        function f1() {
+            var a = [1, 2, 3];
+            for (var i = 0; i < 3; i++)
+                console.log(a[i]);
+        }
+
+        function f2() {
+            var a = [1, 2, 3];
+            for (var i = 0; i < a.length; i++)
+                a[i]++;
+        }
+    }
+}

test/compress/arrow.js

@@ -126,3 +126,12 @@ arrow_binding_pattern_strict: {
     }
     expect_exact: 'var foo=([,])=>"foo";'
 }
+
+arrow_with_regexp: {
+    input: {
+        num => /\d{11,14}/.test( num )
+    }
+    expect: {
+        num => /\d{11,14}/.test( num )
+    }
+}

test/compress/block-scope.js

@@ -89,6 +89,9 @@ remove_unused_in_global_block: {
     }
     expect: {
         var w;
+        let ex;
+        const why;
+        class Zed {};
         var wut;
         console.log(x, y, Zee);
     }

test/compress/collapse_vars.js

@@ -338,14 +338,15 @@ collapse_vars_while: {
 collapse_vars_do_while: {
     options = {
         collapse_vars:true, sequences:true, properties:true, dead_code:true, conditionals:true,
-        comparisons:true, evaluate:true, booleans:false, loops:false, unused:true, hoist_funs:true,
-        keep_fargs:true, if_return:true, join_vars:true, cascade:true, side_effects:true
+        comparisons:true, evaluate:true, booleans:false, loops:false, unused:"keep_assign",
+        hoist_funs:true, keep_fargs:true, if_return:true, join_vars:true, cascade:true,
+        side_effects:true
     }
     input: {
         function f1(y) {
-            // The constant do-while condition `c` will be replaced.
+            // The constant do-while condition `c` will not be replaced.
             var c = 9;
-            do { } while (c === 77);
+            do {} while (c === 77);
         }
         function f2(y) {
             // The non-constant do-while condition `c` will not be replaced.
@@ -380,7 +381,8 @@ collapse_vars_do_while: {
     }
     expect: {
         function f1(y) {
-            do ; while (false);
+            var c = 9;
+            do ; while (77 === c);
         }
         function f2(y) {
             var c = 5 - y;
@@ -409,6 +411,80 @@ collapse_vars_do_while: {
     }
 }
 
+collapse_vars_do_while_drop_assign: {
+    options = {
+        collapse_vars:true, sequences:true, properties:true, dead_code:true, conditionals:true,
+        comparisons:true, evaluate:true, booleans:false, loops:false, unused:true, hoist_funs:true,
+        keep_fargs:true, if_return:true, join_vars:true, cascade:true, side_effects:true
+    }
+    input: {
+        function f1(y) {
+            // The constant do-while condition `c` will be not replaced.
+            var c = 9;
+            do {} while (c === 77);
+        }
+        function f2(y) {
+            // The non-constant do-while condition `c` will not be replaced.
+            var c = 5 - y;
+            do { } while (c);
+        }
+        function f3(y) {
+            // The constant `x` will be replaced in the do loop body.
+            function fn(n) { console.log(n); }
+            var a = 2, x = 7;
+            do {
+                fn(a = x);
+                break;
+            } while (y);
+        }
+        function f4(y) {
+            // The non-constant `a` will not be replaced in the do loop body.
+            var a = y / 4;
+            do {
+                return a;
+            } while (y);
+        }
+        function f5(y) {
+            function p(x) { console.log(x); }
+            do {
+                // The non-constant `a` will be replaced in p(a)
+                // because it is declared in same block.
+                var a = y - 3;
+                p(a);
+            } while (--y);
+        }
+    }
+    expect: {
+        function f1(y) {
+            var c = 9;
+            do ; while (77 === c);
+        }
+        function f2(y) {
+            var c = 5 - y;
+            do ; while (c);
+        }
+        function f3(y) {
+            function fn(n) { console.log(n); }
+            do {
+                fn(7);
+                break;
+            } while (y);
+        }
+        function f4(y) {
+            var a = y / 4;
+            do
+                return a;
+            while (y);
+        }
+        function f5(y) {
+            function p(x) { console.log(x); }
+            do {
+                p(y - 3);
+            } while (--y);
+        }
+    }
+}
+
 collapse_vars_seq: {
     options = {
         collapse_vars:true, sequences:true, properties:true, dead_code:true, conditionals:true,
@@ -567,8 +643,9 @@ collapse_vars_assignment: {
 collapse_vars_lvalues: {
     options = {
         collapse_vars:true, sequences:true, properties:true, dead_code:true, conditionals:true,
-        comparisons:true, evaluate:true, booleans:true, loops:true, unused:true, hoist_funs:true,
-        keep_fargs:true, if_return:true, join_vars:true, cascade:true, side_effects:true
+        comparisons:true, evaluate:true, booleans:true, loops:true, unused:"keep_assign",
+        hoist_funs:true, keep_fargs:true, if_return:true, join_vars:true, cascade:true,
+        side_effects:true
     }
     input: {
         function f0(x) { var i = ++x; return x += i; }
@@ -593,7 +670,38 @@ collapse_vars_lvalues: {
         function f7(x) { var w = e1(), v = e2(), c = v - x; return (w = x) - c; }
         function f8(x) { var w = e1(), v = e2(); return (w = x) - (v - x); }
         function f9(x) { var w = e1(); return e2() - x - (w = x); }
+    }
+}
 
+collapse_vars_lvalues_drop_assign: {
+    options = {
+        collapse_vars:true, sequences:true, properties:true, dead_code:true, conditionals:true,
+        comparisons:true, evaluate:true, booleans:true, loops:true, unused:true, hoist_funs:true,
+        keep_fargs:true, if_return:true, join_vars:true, cascade:true, side_effects:true
+    }
+    input: {
+        function f0(x) { var i = ++x; return x += i; }
+        function f1(x) { var a = (x -= 3); return x += a; }
+        function f2(x) { var z = x, a = ++z; return z += a; }
+        function f3(x) { var a = (x -= 3), b = x + a; return b; }
+        function f4(x) { var a = (x -= 3); return x + a; }
+        function f5(x) { var w = e1(), v = e2(), c = v = --x, b = w = x; return b - c; }
+        function f6(x) { var w = e1(), v = e2(), c = v = --x, b = w = x; return c - b; }
+        function f7(x) { var w = e1(), v = e2(), c = v - x, b = w = x; return b - c; }
+        function f8(x) { var w = e1(), v = e2(), b = w = x, c = v - x; return b - c; }
+        function f9(x) { var w = e1(), v = e2(), b = w = x, c = v - x; return c - b; }
+    }
+    expect: {
+        function f0(x) { var i = ++x; return x += i; }
+        function f1(x) { var a = (x -= 3); return x += a; }
+        function f2(x) { var z = x, a = ++z; return z += a; }
+        function f3(x) { var a = (x -= 3); return x + a; }
+        function f4(x) { var a = (x -= 3); return x + a; }
+        function f5(x) { var v = (e1(), e2()), c = v = --x; return x - c; }
+        function f6(x) { e1(), e2(); return --x - x; }
+        function f7(x) { var v = (e1(), e2()), c = v - x; return x - c; }
+        function f8(x) { var v = (e1(), e2()); return x - (v - x); }
+        function f9(x) { e1(); return e2() - x - x; }
     }
 }
 
@@ -1035,7 +1143,7 @@ collapse_vars_constants: {
         function f3(x) {
             var b = x.prop;
             sideeffect1();
-            return b + (function() { return -9; })();
+            return b + -9;
         }
     }
 }
@@ -1203,9 +1311,147 @@ collapse_vars_regexp: {
             };
         }
         (function(){
-            var result, rx = /ab*/g;
-            while (result = rx.exec('acdabcdeabbb'))
+            var result, s = "acdabcdeabbb", rx = /ab*/g;
+            while (result = rx.exec(s))
                 console.log(result[0]);
         })();
     }
 }
+
+issue_1537: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        var k = '';
+        for (k in {prop: 'val'}){}
+    }
+    expect: {
+        var k = '';
+        for (k in {prop: 'val'});
+    }
+}
+
+issue_1537_for_of: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        var k = '';
+        for (k of {prop: 'val'}){}
+    }
+    expect: {
+        var k = '';
+        for (k of {prop: 'val'});
+    }
+}
+
+issue_1537_destructuring_1: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        var x = 1, y = 2;
+        [x] = [y];
+    }
+    expect: {
+        var x = 1;
+        [x] = [2];
+    }
+}
+
+issue_1537_destructuring_2: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        var x = foo();
+        [x] = [1];
+    }
+    expect: {
+        var x = foo();
+        [x] = [1];
+    }
+}
+
+issue_1537_destructuring_3: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        var x = Math.random();
+        ({p: x = 9} = {v: 1});
+    }
+    expect: {
+        var x = Math.random();
+        ({p: x = 9} = {v: 1});
+    }
+}
+
+issue_1537_destructuring_for_in: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        var x = 1, y = 2;
+        (function() {
+            for ([[x], y] in a);
+        })();
+    }
+    expect: {
+        var x = 1, y = 2;
+        (function() {
+            for ([[x], y] in a);
+        })();
+    }
+}
+
+issue_1537_destructuring_for_of: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        var x = 1, y = 2;
+        (function() {
+            for ([[x], y] of a);
+        })();
+    }
+    expect: {
+        var x = 1, y = 2;
+        (function() {
+            for ([[x], y] of a);
+        })();
+    }
+}
+
+issue_1562: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        var v = 1, B = 2;
+        for (v in objs) f(B);
+
+        var x = 3, C = 10;
+        while(x + 2) bar(C);
+
+        var y = 4, D = 20;
+        do bar(D); while(y + 2);
+
+        var z = 5, E = 30;
+        for (; f(z + 2) ;) bar(E);
+    }
+    expect: {
+        var v = 1;
+        for (v in objs) f(2);
+
+        var x = 3;
+        while(x + 2) bar(10);
+
+        var y = 4;
+        do bar(20); while(y + 2);
+
+        var z = 5;
+        for (; f(z + 2) ;) bar(30);
+    }
+}

test/compress/concat-strings.js

@@ -24,3 +24,193 @@ concat_1: {
         var f = "\x00360\08\0";
     }
 }
+
+concat_2: {
+    options = {};
+    input: {
+        console.log(
+            1 + (2 + 3),
+            1 + (2 + "3"),
+            1 + ("2" + 3),
+            1 + ("2" + "3"),
+            "1" + (2 + 3),
+            "1" + (2 + "3"),
+            "1" + ("2" + 3),
+            "1" + ("2" + "3")
+        );
+    }
+    expect: {
+        console.log(
+            1 + (2 + 3),
+            1 + (2 + "3"),
+            1 + "2" + 3,
+            1 + "2" + "3",
+            "1" + (2 + 3),
+            "1" + 2 + "3",
+            "1" + "2" + 3,
+            "1" + "2" + "3"
+        );
+    }
+}
+
+concat_3: {
+    options = {};
+    input: {
+        console.log(
+            1 + 2 + (3 + 4 + 5),
+            1 + 2 + (3 + 4 + "5"),
+            1 + 2 + (3 + "4" + 5),
+            1 + 2 + (3 + "4" + "5"),
+            1 + 2 + ("3" + 4 + 5),
+            1 + 2 + ("3" + 4 + "5"),
+            1 + 2 + ("3" + "4" + 5),
+            1 + 2 + ("3" + "4" + "5")
+        );
+    }
+    expect: {
+        console.log(
+            1 + 2 + (3 + 4 + 5),
+            1 + 2 + (3 + 4 + "5"),
+            1 + 2 + (3 + "4") + 5,
+            1 + 2 + (3 + "4") + "5",
+            1 + 2 + "3" + 4 + 5,
+            1 + 2 + "3" + 4 + "5",
+            1 + 2 + "3" + "4" + 5,
+            1 + 2 + "3" + "4" + "5"
+        );
+    }
+}
+
+concat_4: {
+    options = {};
+    input: {
+        console.log(
+            1 + "2" + (3 + 4 + 5),
+            1 + "2" + (3 + 4 + "5"),
+            1 + "2" + (3 + "4" + 5),
+            1 + "2" + (3 + "4" + "5"),
+            1 + "2" + ("3" + 4 + 5),
+            1 + "2" + ("3" + 4 + "5"),
+            1 + "2" + ("3" + "4" + 5),
+            1 + "2" + ("3" + "4" + "5")
+        );
+    }
+    expect: {
+        console.log(
+            1 + "2" + (3 + 4 + 5),
+            1 + "2" + (3 + 4) + "5",
+            1 + "2" + 3 + "4" + 5,
+            1 + "2" + 3 + "4" + "5",
+            1 + "2" + "3" + 4 + 5,
+            1 + "2" + "3" + 4 + "5",
+            1 + "2" + "3" + "4" + 5,
+            1 + "2" + "3" + "4" + "5"
+        );
+    }
+}
+
+concat_5: {
+    options = {};
+    input: {
+        console.log(
+            "1" + 2 + (3 + 4 + 5),
+            "1" + 2 + (3 + 4 + "5"),
+            "1" + 2 + (3 + "4" + 5),
+            "1" + 2 + (3 + "4" + "5"),
+            "1" + 2 + ("3" + 4 + 5),
+            "1" + 2 + ("3" + 4 + "5"),
+            "1" + 2 + ("3" + "4" + 5),
+            "1" + 2 + ("3" + "4" + "5")
+        );
+    }
+    expect: {
+        console.log(
+            "1" + 2 + (3 + 4 + 5),
+            "1" + 2 + (3 + 4) + "5",
+            "1" + 2 + 3 + "4" + 5,
+            "1" + 2 + 3 + "4" + "5",
+            "1" + 2 + "3" + 4 + 5,
+            "1" + 2 + "3" + 4 + "5",
+            "1" + 2 + "3" + "4" + 5,
+            "1" + 2 + "3" + "4" + "5"
+        );
+    }
+}
+
+concat_6: {
+    options = {};
+    input: {
+        console.log(
+            "1" + "2" + (3 + 4 + 5),
+            "1" + "2" + (3 + 4 + "5"),
+            "1" + "2" + (3 + "4" + 5),
+            "1" + "2" + (3 + "4" + "5"),
+            "1" + "2" + ("3" + 4 + 5),
+            "1" + "2" + ("3" + 4 + "5"),
+            "1" + "2" + ("3" + "4" + 5),
+            "1" + "2" + ("3" + "4" + "5")
+        );
+    }
+    expect: {
+        console.log(
+            "1" + "2" + (3 + 4 + 5),
+            "1" + "2" + (3 + 4) + "5",
+            "1" + "2" + 3 + "4" + 5,
+            "1" + "2" + 3 + "4" + "5",
+            "1" + "2" + "3" + 4 + 5,
+            "1" + "2" + "3" + 4 + "5",
+            "1" + "2" + "3" + "4" + 5,
+            "1" + "2" + "3" + "4" + "5"
+        );
+    }
+}
+
+concat_7: {
+    input: {
+        console.log(
+            "" + 1,
+            "" + "1",
+            "" + 1 + 2,
+            "" + 1 + "2",
+            "" + "1" + 2,
+            "" + "1" + "2",
+            "" + (x += "foo")
+        );
+    }
+    expect: {
+        console.log(
+            "" + 1,
+            "1",
+            "" + 1 + 2,
+            1 + "2",
+            "1" + 2,
+            "1" + "2",
+            x += "foo"
+        );
+    }
+}
+
+concat_8: {
+    input: {
+        console.log(
+            1 + "",
+            "1" + "",
+            1 + 2 + "",
+            1 + "2" + "",
+            "1" + 2 + "",
+            "1" + "2" + "",
+            (x += "foo") + ""
+        );
+    }
+    expect: {
+        console.log(
+            1 + "",
+            "1",
+            1 + 2 + "",
+            1 + "2",
+            "1" + 2,
+            "1" + "2",
+            x += "foo"
+        );
+    }
+}

test/compress/conditionals.js

@@ -50,7 +50,8 @@ ifs_3_should_warn: {
         conditionals : true,
         dead_code    : true,
         evaluate     : true,
-        booleans     : true
+        booleans     : true,
+        side_effects : true,
     };
     input: {
         var x, y;
@@ -135,16 +136,28 @@ ifs_6: {
         comparisons: true
     };
     input: {
-        var x;
+        var x, y;
         if (!foo && !bar && !baz && !boo) {
             x = 10;
         } else {
             x = 20;
         }
+        if (y) {
+            x[foo] = 10;
+        } else {
+            x[foo] = 20;
+        }
+        if (foo) {
+            x[bar] = 10;
+        } else {
+            x[bar] = 20;
+        }
     }
     expect: {
-        var x;
+        var x, y;
         x = foo || bar || baz || boo ? 20 : 10;
+        x[foo] = y ? 10 : 20;
+        foo ? x[bar] = 10 : x[bar] = 20;
     }
 }
 
@@ -159,10 +172,16 @@ cond_1: {
         } else {
             do_something(y);
         }
+        if (some_condition()) {
+            side_effects(x);
+        } else {
+            side_effects(y);
+        }
     }
     expect: {
         var do_something;
         do_something(some_condition() ? x : y);
+        some_condition() ? side_effects(x) : side_effects(y);
     }
 }
 
@@ -213,10 +232,16 @@ cond_4: {
         } else {
             do_something();
         }
+        if (some_condition()) {
+            side_effects();
+        } else {
+            side_effects();
+        }
     }
     expect: {
         var do_something;
         some_condition(), do_something();
+        some_condition(), side_effects();
     }
 }
 
@@ -250,7 +275,8 @@ cond_5: {
 cond_7: {
     options = {
         conditionals: true,
-        evaluate    : true
+        evaluate    : true,
+        side_effects: true,
     };
     input: {
         var x, y, z, a, b;
@@ -635,166 +661,6 @@ ternary_boolean_alternative: {
     }
 }
 
-conditional_and: {
-    options = {
-        conditionals: true,
-        evaluate    : true
-    };
-    input: {
-        var a;
-        // compress these
-
-        a = true     && condition;
-        a = 1        && console.log("a");
-        a = 2 * 3    && 2 * condition;
-        a = 5 == 5   && condition + 3;
-        a = "string" && 4 - condition;
-        a = 5 + ""   && condition / 5;
-        a = -4.5     && 6 << condition;
-        a = 6        && 7;
-
-        a = false     && condition;
-        a = NaN       && console.log("b");
-        a = 0         && console.log("c");
-        a = undefined && 2 * condition;
-        a = null      && condition + 3;
-        a = 2 * 3 - 6 && 4 - condition;
-        a = 10 == 7   && condition / 5;
-        a = !"string" && 6 % condition;
-        a = 0         && 7;
-
-        // don't compress these
-
-        a = condition        && true;
-        a = console.log("a") && 2;
-        a = 4 - condition    && "string";
-        a = 6 << condition   && -4.5;
-
-        a = condition        && false;
-        a = console.log("b") && NaN;
-        a = console.log("c") && 0;
-        a = 2 * condition    && undefined;
-        a = condition + 3    && null;
-
-    }
-    expect: {
-        var a;
-
-        a = condition;
-        a = console.log("a");
-        a = 2 * condition;
-        a = condition + 3;
-        a = 4 - condition;
-        a = condition / 5;
-        a = 6 << condition;
-        a = 7;
-
-        a = false;
-        a = NaN;
-        a = 0;
-        a = void 0;
-        a = null;
-        a = 0;
-        a = false;
-        a = false;
-        a = 0;
-
-        a = condition        && true;
-        a = console.log("a") && 2;
-        a = 4 - condition    && "string";
-        a = 6 << condition   && -4.5;
-
-        a = condition        && false;
-        a = console.log("b") && NaN;
-        a = console.log("c") && 0;
-        a = 2 * condition    && void 0;
-        a = condition + 3    && null;
-    }
-}
-
-conditional_or: {
-    options = {
-        conditionals: true,
-        evaluate    : true
-    };
-    input: {
-        var a;
-        // compress these
-
-        a = true     || condition;
-        a = 1        || console.log("a");
-        a = 2 * 3    || 2 * condition;
-        a = 5 == 5   || condition + 3;
-        a = "string" || 4 - condition;
-        a = 5 + ""   || condition / 5;
-        a = -4.5     || 6 << condition;
-        a = 6        || 7;
-
-        a = false     || condition;
-        a = 0         || console.log("b");
-        a = NaN       || console.log("c");
-        a = undefined || 2 * condition;
-        a = null      || condition + 3;
-        a = 2 * 3 - 6 || 4 - condition;
-        a = 10 == 7   || condition / 5;
-        a = !"string" || 6 % condition;
-        a = null      || 7;
-
-        a = console.log(undefined && condition || null);
-        a = console.log(undefined || condition && null);
-
-        // don't compress these
-
-        a = condition        || true;
-        a = console.log("a") || 2;
-        a = 4 - condition    || "string";
-        a = 6 << condition   || -4.5;
-
-        a = condition        || false;
-        a = console.log("b") || NaN;
-        a = console.log("c") || 0;
-        a = 2 * condition    || undefined;
-        a = condition + 3    || null;
-
-    }
-    expect: {
-        var a;
-
-        a = true;
-        a = 1;
-        a = 6;
-        a = true;
-        a = "string";
-        a = "5";
-        a = -4.5;
-        a = 6;
-
-        a = condition;
-        a = console.log("b");
-        a = console.log("c");
-        a = 2 * condition;
-        a = condition + 3;
-        a = 4 - condition;
-        a = condition / 5;
-        a = 6 % condition;
-        a = 7;
-
-        a = console.log(null);
-        a = console.log(condition && null);
-
-        a = condition        || true;
-        a = console.log("a") || 2;
-        a = 4 - condition    || "string";
-        a = 6 << condition   || -4.5;
-
-        a = condition        || false;
-        a = console.log("b") || NaN;
-        a = console.log("c") || 0;
-        a = 2 * condition    || void 0;
-        a = condition + 3    || null;
-    }
-}
-
 trivial_boolean_ternary_expressions : {
     options = {
         conditionals: true,
@@ -874,6 +740,7 @@ issue_1154: {
         conditionals: true,
         evaluate    : true,
         booleans    : true,
+        side_effects: true,
     };
     input: {
         function f1(x) { return x ? -1 : -1; }
@@ -902,7 +769,31 @@ issue_1154: {
         function g2() { return g(), 2; }
         function g3() { return g(), -4; }
         function g4() { return g(), !1; }
-        function g5() { return g(), void 0; }
+        function g5() { return void g(); }
         function g6() { return g(), "number"; }
     }
 }
+
+no_evaluate: {
+    options = {
+        conditionals: true,
+        evaluate    : false,
+        side_effects: true,
+    }
+    input: {
+        function f(b) {
+            a = b ? !0 : !0;
+            a = b ? ~1 : ~1;
+            a = b ? -2 : -2;
+            a = b ? +3 : +3;
+        }
+    }
+    expect: {
+        function f(b) {
+            a = !0;
+            a = ~1;
+            a = -2;
+            a = +3;
+        }
+    }
+}

test/compress/const.js

@@ -0,0 +1,165 @@
+issue_1191: {
+    options = {
+        evaluate      : true,
+        booleans      : true,
+        comparisons   : true,
+        dead_code     : true,
+        conditionals  : true,
+        side_effects  : true,
+        unused        : true,
+        hoist_funs    : true,
+        if_return     : true,
+        join_vars     : true,
+        sequences     : false,
+        collapse_vars : false,
+        reduce_vars   : true,
+    }
+    input: {
+        function foo(rot) {
+            const rotTol = 5;
+            if (rot < -rotTol || rot > rotTol)
+                bar();
+            baz();
+        }
+    }
+    expect: {
+        function foo(rot) {
+            (rot < -5 || rot > 5) && bar();
+            baz();
+        }
+    }
+}
+
+issue_1194: {
+    options = {
+        evaluate      : true,
+        booleans      : true,
+        comparisons   : true,
+        dead_code     : true,
+        conditionals  : true,
+        side_effects  : true,
+        unused        : true,
+        hoist_funs    : true,
+        if_return     : true,
+        join_vars     : true,
+        sequences     : false,
+        collapse_vars : false,
+        reduce_vars   : true,
+    }
+    input: {
+        function f1() {const a = "X"; return a + a;}
+        function f2() {const aa = "X"; return aa + aa;}
+        function f3() {const aaa = "X"; return aaa + aaa;}
+    }
+    expect: {
+        function f1(){return"XX"}
+        function f2(){return"XX"}
+        function f3(){return"XX"}
+    }
+}
+
+issue_1396: {
+    options = {
+        evaluate      : true,
+        booleans      : true,
+        comparisons   : true,
+        dead_code     : true,
+        conditionals  : true,
+        side_effects  : true,
+        unused        : true,
+        hoist_funs    : true,
+        if_return     : true,
+        join_vars     : true,
+        sequences     : false,
+        collapse_vars : false,
+        reduce_vars   : true,
+    }
+    input: {
+        function foo(a) {
+            const VALUE = 1;
+            console.log(2 | VALUE);
+            console.log(VALUE + 1);
+            console.log(VALUE);
+            console.log(a & VALUE);
+        }
+        function bar() {
+            const s = "01234567890123456789";
+            console.log(s + s + s + s + s);
+
+            const CONSTANT = "abc";
+            console.log(CONSTANT + CONSTANT + CONSTANT + CONSTANT + CONSTANT);
+        }
+    }
+    expect: {
+        function foo(a) {
+            console.log(3);
+            console.log(2);
+            console.log(1);
+            console.log(1 & a);
+        }
+        function bar() {
+            const s = "01234567890123456789";
+            console.log(s + s + s + s + s);
+
+            console.log("abcabcabcabcabc");
+        }
+    }
+}
+
+unused_regexp_literal: {
+    options = {
+        evaluate      : true,
+        booleans      : true,
+        comparisons   : true,
+        dead_code     : true,
+        conditionals  : true,
+        side_effects  : true,
+        unused        : true,
+        hoist_funs    : true,
+        if_return     : true,
+        join_vars     : true,
+        sequences     : false,
+        collapse_vars : false,
+    }
+    input: {
+        function f(){ var a = /b/; }
+    }
+    expect: {
+        function f(){}
+    }
+}
+
+regexp_literal_not_const: {
+    options = {
+        evaluate      : true,
+        booleans      : true,
+        comparisons   : true,
+        dead_code     : true,
+        conditionals  : true,
+        side_effects  : true,
+        unused        : true,
+        hoist_funs    : true,
+        if_return     : true,
+        join_vars     : true,
+        sequences     : false,
+        collapse_vars : false,
+        reduce_vars   : true,
+    }
+    input: {
+        (function(){
+            var result;
+            const s = 'acdabcdeabbb';
+            const REGEXP_LITERAL = /ab*/g;
+            while (result = REGEXP_LITERAL.exec(s)) {
+                console.log(result[0]);
+            }
+        })();
+    }
+    expect: {
+        (function() {
+            var result;
+            const REGEXP_LITERAL = /ab*/g;
+            while (result = REGEXP_LITERAL.exec("acdabcdeabbb")) console.log(result[0]);
+        })();
+    }
+}

test/compress/dead-code.js

@@ -64,7 +64,8 @@ dead_code_constant_boolean_should_warn_more: {
         loops        : true,
         booleans     : true,
         conditionals : true,
-        evaluate     : true
+        evaluate     : true,
+        side_effects : true,
     };
     input: {
         while (!((foo && bar) || (x + "0"))) {
@@ -116,7 +117,8 @@ dead_code_const_declaration: {
         loops        : true,
         booleans     : true,
         conditionals : true,
-        evaluate     : true
+        evaluate     : true,
+        reduce_vars  : true,
     };
     input: {
         var unused;
@@ -141,7 +143,9 @@ dead_code_const_annotation: {
         loops        : true,
         booleans     : true,
         conditionals : true,
-        evaluate     : true
+        evaluate     : true,
+        reduce_vars  : true,
+        toplevel     : true,
     };
     input: {
         var unused;
@@ -189,7 +193,9 @@ dead_code_const_annotation_complex_scope: {
         loops        : true,
         booleans     : true,
         conditionals : true,
-        evaluate     : true
+        evaluate     : true,
+        reduce_vars  : true,
+        toplevel     : true,
     };
     input: {
         var unused_var;
@@ -223,6 +229,5 @@ dead_code_const_annotation_complex_scope: {
         var beef = 'good';
         var meat = 'beef';
         var pork = 'bad';
-        'good' === pork && console.log('reached, not const');
     }
 }

test/compress/destructuring.js

@@ -50,6 +50,9 @@ destructuring_objects: {
 }
 
 destructuring_objects_trailing_elision: {
+    beautify = {
+        ecma: 6
+    }
     input: {
         var {cc,} = foo;
     }
@@ -57,6 +60,9 @@ destructuring_objects_trailing_elision: {
 }
 
 nested_destructuring_objects: {
+    beautify = {
+        ecma: 6
+    }
     input: {
         const [{a},b] = c;
         let [{a},b] = c;
@@ -66,6 +72,9 @@ nested_destructuring_objects: {
 }
 
 destructuring_constdef_in_loops: {
+    beautify = {
+        ecma: 6
+    }
     input: {
         for (const [x,y] in pairs);
         for (const [a] = 0;;);
@@ -75,6 +84,9 @@ destructuring_constdef_in_loops: {
 }
 
 destructuring_letdef_in_loops: {
+    beautify = {
+        ecma: 6
+    }
     input: {
         for (let [x,y] in pairs);
         for (let [a] = 0;;);
@@ -84,6 +96,9 @@ destructuring_letdef_in_loops: {
 }
 
 destructuring_vardef_in_loops: {
+    beautify = {
+        ecma: 6
+    }
     input: {
         for (var [x,y] in pairs);
         for (var [a] = 0;;);
@@ -104,3 +119,177 @@ destructuring_expressions: {
     expect_exact: "({a,b});[{a}];f({x});"
 }
 
+destructuring_remove_unused_1: {
+    options = {
+        unused: true
+    }
+    input: {
+        function a() {
+            var unused = "foo";
+            var a = [1];
+            var [b] = a;
+            f(b);
+        }
+        function b() {
+            var unused = "foo";
+            var a = {b: 1};
+            var {b} = a;
+            f(b);
+        }
+        function c() {
+            var unused = "foo";
+            var a = [[1]];
+            var [[b]] = a;
+            f(b);
+        }
+        function d() {
+            var unused = "foo";
+            var a = {b: {b:1}};
+            var {b:{b}} = a;
+            f(b);
+        }
+        function e() {
+            var unused = "foo";
+            var a = [1, 2, 3, 4, 5];
+            var [b, ...c] = a;
+            f(b, c);
+        }
+    }
+    expect: {
+        function a() {
+            var a = [1];
+            var [b] = a;
+            f(b);
+        }
+        function b() {
+            var a = {b: 1};
+            var {b} = a;
+            f(b);
+        }
+        function c() {
+            var a = [[1]];
+            var [[b]] = a;
+            f(b);
+        }
+        function d() {
+            var a = {b: {b:1}};
+            var {b:{b}} = a;
+            f(b);
+        }
+        function e() {
+            var a = [1, 2, 3, 4, 5];
+            var [b, ...c] = a;
+            f(b, c);
+        }
+    }
+}
+
+destructuring_remove_unused_2: {
+    options = {
+        unused: true
+    }
+    input: {
+        function a() {
+            var unused = "foo";
+            var a = [,,1];
+            var [b] = a;
+            f(b);
+        }
+        function b() {
+            var unused = "foo";
+            var a = [{a: [1]}];
+            var [{b: a}] = a;
+            f(b);
+        }
+    }
+    expect: {
+        function a() {
+            var a = [,,1];
+            var [b] = a;
+            f(b);
+        }
+        function b() {
+            var a = [{a: [1]}];
+            var [{b: a}] = a;
+            f(b);
+        }
+    }
+}
+
+object_destructuring_may_need_parentheses: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        ({a, b} = {a: 1, b: 2});
+    }
+    expect_exact: "({a,b}={a:1,b:2});"
+}
+
+destructuring_with_undefined_as_default_assignment: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        [foo = undefined] = bar;
+        [foo = void 0] = bar;
+    }
+    expect: {
+        [foo] = bar;
+        [foo] = bar;
+    }
+}
+
+destructuring_dont_evaluate_with_undefined_as_default_assignment: {
+    options = {
+        evaluate: false
+    }
+    input: {
+        [foo = undefined] = bar;
+    }
+    expect: {
+        [foo = void 0] = bar;
+    }
+}
+
+reduce_vars: {
+    options = {
+        reduce_vars: true,
+    }
+    input: {
+        {const [aa, [bb, cc]] = dd;}
+        {let [aa, [bb, cc]] = dd;}
+        var [aa, [bb, cc]] = dd;
+        [aa, [bb, cc]] = dd;
+        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
+        ({aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}});
+        const [{a},b] = c;
+        let [{a},b] = c;
+        var [{a},b] = c;
+        [{a},b] = c;
+        for (const [x,y] in pairs);
+        for (let [x,y] in pairs);
+        for (var [x,y] in pairs);
+        for ([x,y] in pairs);
+    }
+    expect: {
+        {const [aa, [bb, cc]] = dd;}
+        {let [aa, [bb, cc]] = dd;}
+        var [aa, [bb, cc]] = dd;
+        [aa, [bb, cc]] = dd;
+        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
+        ({aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}});
+        const [{a},b] = c;
+        let [{a},b] = c;
+        var [{a},b] = c;
+        [{a},b] = c;
+        for (const [x,y] in pairs);
+        for (let [x,y] in pairs);
+        for (var [x,y] in pairs);
+        for ([x,y] in pairs);
+    }
+}

test/compress/drop-console.js

@@ -1,24 +1,24 @@
-drop_console_1: {
-    options = {};
-    input: {
-        console.log('foo');
-        console.log.apply(console, arguments);
-    }
-    expect: {
-        console.log('foo');
-        console.log.apply(console, arguments);
-    }
-}
-
-drop_console_1: {
-    options = { drop_console: true };
-    input: {
-        console.log('foo');
-        console.log.apply(console, arguments);
-    }
-    expect: {
-        // with regular compression these will be stripped out as well
-        void 0;
-        void 0;
-    }
-}
+drop_console_1: {
+    options = {};
+    input: {
+        console.log('foo');
+        console.log.apply(console, arguments);
+    }
+    expect: {
+        console.log('foo');
+        console.log.apply(console, arguments);
+    }
+}
+
+drop_console_2: {
+    options = { drop_console: true };
+    input: {
+        console.log('foo');
+        console.log.apply(console, arguments);
+    }
+    expect: {
+        // with regular compression these will be stripped out as well
+        void 0;
+        void 0;
+    }
+}

test/compress/drop-unused.js

@@ -258,3 +258,617 @@ keep_fnames: {
         }
     }
 }
+
+drop_assign: {
+    options = { unused: true };
+    input: {
+        function f1() {
+            var a;
+            a = 1;
+        }
+        function f2() {
+            var a = 1;
+            a = 2;
+        }
+        function f3(a) {
+            a = 1;
+        }
+        function f4() {
+            var a;
+            return a = 1;
+        }
+        function f5() {
+            var a;
+            return function() {
+                a = 1;
+            }
+        }
+    }
+    expect: {
+        function f1() {
+            1;
+        }
+        function f2() {
+            2;
+        }
+        function f3(a) {
+            1;
+        }
+        function f4() {
+            return 1;
+        }
+        function f5() {
+            var a;
+            return function() {
+                a = 1;
+            }
+        }
+    }
+}
+
+keep_assign: {
+    options = { unused: "keep_assign" };
+    input: {
+        function f1() {
+            var a;
+            a = 1;
+        }
+        function f2() {
+            var a = 1;
+            a = 2;
+        }
+        function f3(a) {
+            a = 1;
+        }
+        function f4() {
+            var a;
+            return a = 1;
+        }
+        function f5() {
+            var a;
+            return function() {
+                a = 1;
+            }
+        }
+    }
+    expect: {
+        function f1() {
+            var a;
+            a = 1;
+        }
+        function f2() {
+            var a = 1;
+            a = 2;
+        }
+        function f3(a) {
+            a = 1;
+        }
+        function f4() {
+            var a;
+            return a = 1;
+        }
+        function f5() {
+            var a;
+            return function() {
+                a = 1;
+            }
+        }
+    }
+}
+
+drop_toplevel_funcs: {
+    options = { toplevel: "funcs", 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: {
+        var a, b = 1, c = g;
+        a = 2;
+        function g() {}
+        console.log(b = 3);
+    }
+}
+
+drop_toplevel_vars: {
+    options = { 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: {
+        var c = g;
+        function f(d) {
+            return function() {
+                c = 2;
+            }
+        }
+        2;
+        function g() {}
+        function h() {}
+        console.log(3);
+    }
+}
+
+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: {
+        var c = g;
+        function f() {
+            return function() {
+                c = 2;
+            }
+        }
+        2;
+        function g() {}
+        function h() {}
+        console.log(3);
+    }
+}
+
+drop_toplevel_all: {
+    options = { toplevel: true, 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: {
+        2;
+        console.log(3);
+    }
+}
+
+drop_toplevel_retain: {
+    options = { top_retain: "f,a,o", 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: {
+        var a, c = g;
+        function f(d) {
+            return function() {
+                c = 2;
+            }
+        }
+        a = 2;
+        function g() {}
+        console.log(3);
+    }
+}
+
+drop_toplevel_retain_array: {
+    options = { top_retain: [ "f", "a", "o" ], 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: {
+        var a, c = g;
+        function f(d) {
+            return function() {
+                c = 2;
+            }
+        }
+        a = 2;
+        function g() {}
+        console.log(3);
+    }
+}
+
+drop_toplevel_retain_regex: {
+    options = { top_retain: /^[fao]$/, 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: {
+        var a, c = g;
+        function f(d) {
+            return function() {
+                c = 2;
+            }
+        }
+        a = 2;
+        function g() {}
+        console.log(3);
+    }
+}
+
+drop_toplevel_all_retain: {
+    options = { toplevel: true, top_retain: "f,a,o", 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: {
+        var a, c = g;
+        function f(d) {
+            return function() {
+                c = 2;
+            }
+        }
+        a = 2;
+        function g() {}
+        console.log(3);
+    }
+}
+
+drop_toplevel_funcs_retain: {
+    options = { toplevel: "funcs", top_retain: "f,a,o", 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: {
+        var a, b = 1, c = g;
+        function f(d) {
+            return function() {
+                c = 2;
+            }
+        }
+        a = 2;
+        function g() {}
+        console.log(b = 3);
+    }
+}
+
+drop_toplevel_vars_retain: {
+    options = { toplevel: "vars", top_retain: "f,a,o", 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: {
+        var a, c = g;
+        function f(d) {
+            return function() {
+                c = 2;
+            }
+        }
+        a = 2;
+        function g() {}
+        function h() {}
+        console.log(3);
+    }
+}
+
+drop_toplevel_keep_assign: {
+    options = { toplevel: true, unused: "keep_assign" };
+    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: {
+        var a, b = 1;
+        a = 2;
+        console.log(b = 3);
+    }
+}
+
+drop_fargs: {
+    options = {
+        keep_fargs: false,
+        unused: true,
+    }
+    input: {
+        function f(a) {
+            var b = a;
+        }
+    }
+    expect: {
+        function f() {}
+    }
+}
+
+drop_fnames: {
+    options = {
+        keep_fnames: false,
+        unused: true,
+    }
+    input: {
+        function f() {
+            return function g() {
+                var a = g;
+            };
+        }
+    }
+    expect: {
+        function f() {
+            return function() {};
+        }
+    }
+}
+
+global_var: {
+    options = {
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        var a;
+        function foo(b) {
+            a;
+            b;
+            c;
+            typeof c === "undefined";
+            c + b + a;
+            b && b.ar();
+            return b;
+        }
+    }
+    expect: {
+        var a;
+        function foo(b) {
+            c;
+            c;
+            b && b.ar();
+            return b;
+        }
+    }
+}
+
+iife: {
+    options = {
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        function f() {
+            var a;
+            ~function() {}(b);
+        }
+    }
+    expect: {
+        function f() {
+            b;
+        }
+    }
+}
+
+drop_value: {
+    options = {
+        side_effects: true,
+    }
+    input: {
+        (1, [2, foo()], 3, {a:1, b:bar()});
+    }
+    expect: {
+        foo(), bar();
+    }
+}
+
+const_assign: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        function f() {
+            const b = 2;
+            return 1 + b;
+        }
+
+        function g() {
+            const b = 2;
+            b = 3;
+            return 1 + b;
+        }
+    }
+    expect: {
+        function f() {
+            return 3;
+        }
+
+        function g() {
+            const b = 2;
+            b = 3;
+            return 1 + b;
+        }
+    }
+}
+
+issue_1539: {
+    options = {
+        cascade: true,
+        sequences: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        function f() {
+            var a, b;
+            a = b = 42;
+            return a;
+        }
+    }
+    expect: {
+        function f() {
+            return 42;
+        }
+    }
+}
+
+vardef_value: {
+    options = {
+        keep_fnames: false,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        function f() {
+            function g(){
+                return x();
+            }
+            var a = g();
+            return a(42);
+        }
+    }
+    expect: {
+        function f() {
+            var a = function(){
+                return x();
+            }();
+            return a(42);
+        }
+    }
+}
+
+assign_binding: {
+    options = {
+        cascade: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        function f() {
+            var a;
+            a = f.g, a();
+        }
+    }
+    expect: {
+        function f() {
+            (0, f.g)();
+        }
+    }
+}
+
+assign_chain: {
+    options = {
+        unused: true,
+    }
+    input: {
+        function f() {
+            var a, b;
+            x = a = y = b = 42;
+        }
+    }
+    expect: {
+        function f() {
+            x = y = 42;
+        }
+    }
+}
+
+issue_1583: {
+    options = {
+        keep_fargs: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        function m(t) {
+            (function(e) {
+                t = e();
+            })(function() {
+                return (function(a) {
+                    return a;
+                })(function(a) {});
+            });
+        }
+    }
+    expect: {
+        function m(t) {
+            (function(e) {
+                t = (function() {
+                    return (function(a) {
+                        return a;
+                    })(function(a) {});
+                })();
+            })();
+        }
+    }
+}

test/compress/evaluate.js

@@ -1,3 +1,187 @@
+and: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        var a;
+        // compress these
+
+        a = true     && condition;
+        a = 1        && console.log("a");
+        a = 2 * 3    && 2 * condition;
+        a = 5 == 5   && condition + 3;
+        a = "string" && 4 - condition;
+        a = 5 + ""   && condition / 5;
+        a = -4.5     && 6 << condition;
+        a = 6        && 7;
+
+        a = false     && condition;
+        a = NaN       && console.log("b");
+        a = 0         && console.log("c");
+        a = undefined && 2 * condition;
+        a = null      && condition + 3;
+        a = 2 * 3 - 6 && 4 - condition;
+        a = 10 == 7   && condition / 5;
+        a = !"string" && 6 % condition;
+        a = 0         && 7;
+
+        // don't compress these
+
+        a = condition        && true;
+        a = console.log("a") && 2;
+        a = 4 - condition    && "string";
+        a = 6 << condition   && -4.5;
+
+        a = condition        && false;
+        a = console.log("b") && NaN;
+        a = console.log("c") && 0;
+        a = 2 * condition    && undefined;
+        a = condition + 3    && null;
+
+    }
+    expect: {
+        var a;
+
+        a = condition;
+        a = console.log("a");
+        a = 2 * condition;
+        a = condition + 3;
+        a = 4 - condition;
+        a = condition / 5;
+        a = 6 << condition;
+        a = 7;
+
+        a = false;
+        a = NaN;
+        a = 0;
+        a = void 0;
+        a = null;
+        a = 0;
+        a = false;
+        a = false;
+        a = 0;
+
+        a = condition        && true;
+        a = console.log("a") && 2;
+        a = 4 - condition    && "string";
+        a = 6 << condition   && -4.5;
+
+        a = condition        && false;
+        a = console.log("b") && NaN;
+        a = console.log("c") && 0;
+        a = 2 * condition    && void 0;
+        a = condition + 3    && null;
+    }
+}
+
+or: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        var a;
+        // compress these
+
+        a = true     || condition;
+        a = 1        || console.log("a");
+        a = 2 * 3    || 2 * condition;
+        a = 5 == 5   || condition + 3;
+        a = "string" || 4 - condition;
+        a = 5 + ""   || condition / 5;
+        a = -4.5     || 6 << condition;
+        a = 6        || 7;
+
+        a = false     || condition;
+        a = 0         || console.log("b");
+        a = NaN       || console.log("c");
+        a = undefined || 2 * condition;
+        a = null      || condition + 3;
+        a = 2 * 3 - 6 || 4 - condition;
+        a = 10 == 7   || condition / 5;
+        a = !"string" || 6 % condition;
+        a = null      || 7;
+
+        a = console.log(undefined && condition || null);
+        a = console.log(undefined || condition && null);
+
+        // don't compress these
+
+        a = condition        || true;
+        a = console.log("a") || 2;
+        a = 4 - condition    || "string";
+        a = 6 << condition   || -4.5;
+
+        a = condition        || false;
+        a = console.log("b") || NaN;
+        a = console.log("c") || 0;
+        a = 2 * condition    || undefined;
+        a = condition + 3    || null;
+
+    }
+    expect: {
+        var a;
+
+        a = true;
+        a = 1;
+        a = 6;
+        a = true;
+        a = "string";
+        a = "5";
+        a = -4.5;
+        a = 6;
+
+        a = condition;
+        a = console.log("b");
+        a = console.log("c");
+        a = 2 * condition;
+        a = condition + 3;
+        a = 4 - condition;
+        a = condition / 5;
+        a = 6 % condition;
+        a = 7;
+
+        a = console.log(null);
+        a = console.log(condition && null);
+
+        a = condition        || true;
+        a = console.log("a") || 2;
+        a = 4 - condition    || "string";
+        a = 6 << condition   || -4.5;
+
+        a = condition        || false;
+        a = console.log("b") || NaN;
+        a = console.log("c") || 0;
+        a = 2 * condition    || void 0;
+        a = condition + 3    || null;
+    }
+}
+
+unary_prefix: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        a = !0 && b;
+        a = !0 || b;
+        a = ~1 && b;
+        a = ~1 || b;
+        a = -2 && b;
+        a = -2 || b;
+        a = +3 && b;
+        a = +3 || b;
+    }
+    expect: {
+        a = b;
+        a = !0;
+        a = b;
+        a = -2;
+        a = b;
+        a = -2;
+        a = b;
+        a = 3;
+    }
+}
+
 negative_zero: {
     options = { evaluate: true }
     input: {
@@ -95,12 +279,18 @@ pow_with_number_constants: {
         evaluate: true
     }
     input: {
-        var a = 5 ** NaN; /* NaN exponent results to NaN */
-        var b = 42 ** +0; /* +0 exponent results to NaN */
-        var c = 42 ** -0; /* -0 exponent results to NaN */
-        var d = NaN ** 1; /* NaN with non-zero exponent is NaN */
-        var e = 2 ** Infinity; /* abs(base) > 1 with Infinity as exponent is Infinity */
-        var f = 2 ** -Infinity; /* abs(base) > 1 with -Infinity as exponent is +0 */
+        var a = 5 ** NaN;
+        /* NaN exponent results to NaN */
+        var b = 42 ** +0;
+        /* +0 exponent results to NaN */
+        var c = 42 ** -0;
+        /* -0 exponent results to NaN */
+        var d = NaN ** 1;
+        /* NaN with non-zero exponent is NaN */
+        var e = 2 ** Infinity;
+        /* abs(base) > 1 with Infinity as exponent is Infinity */
+        var f = 2 ** -Infinity;
+        /* abs(base) > 1 with -Infinity as exponent is +0 */
         var g = (-7) ** (0.5);
         var h = 2324334 ** 34343443;
         var i = (-2324334) ** 34343443;
@@ -125,3 +315,483 @@ pow_with_number_constants: {
         var m = 3 ** -10;
     }
 }
+
+unsafe_constant: {
+    options = {
+        evaluate  : true,
+        unsafe    : true
+    }
+    input: {
+        console.log(
+            true.a,
+            false.a,
+            null.a,
+            undefined.a
+        );
+    }
+    expect: {
+        console.log(
+            true.a,
+            false.a,
+            null.a,
+            (void 0).a
+        );
+    }
+}
+
+unsafe_object: {
+    options = {
+        evaluate  : true,
+        unsafe    : true
+    }
+    input: {
+        console.log(
+            ({a:1}) + 1,
+            ({a:1}).a + 1,
+            ({a:1}).b + 1,
+            ({a:1}).a.b + 1
+        );
+    }
+    expect: {
+        console.log(
+            ({a:1}) + 1,
+            2,
+            ({a:1}).b + 1,
+            1..b + 1
+        );
+    }
+}
+
+unsafe_object_nested: {
+    options = {
+        evaluate  : true,
+        unsafe    : true
+    }
+    input: {
+        console.log(
+            ({a:{b:1}}) + 1,
+            ({a:{b:1}}).a + 1,
+            ({a:{b:1}}).b + 1,
+            ({a:{b:1}}).a.b + 1
+        );
+    }
+    expect: {
+        console.log(
+            ({a:{b:1}}) + 1,
+            ({a:{b:1}}).a + 1,
+            ({a:{b:1}}).b + 1,
+            2
+        );
+    }
+}
+
+unsafe_object_complex: {
+    options = {
+        evaluate  : true,
+        unsafe    : true
+    }
+    input: {
+        console.log(
+            ({a:{b:1},b:1}) + 1,
+            ({a:{b:1},b:1}).a + 1,
+            ({a:{b:1},b:1}).b + 1,
+            ({a:{b:1},b:1}).a.b + 1
+        );
+    }
+    expect: {
+        console.log(
+            ({a:{b:1},b:1}) + 1,
+            ({a:{b:1},b:1}).a + 1,
+            2,
+            2
+        );
+    }
+}
+
+unsafe_object_repeated: {
+    options = {
+        evaluate  : true,
+        unsafe    : true
+    }
+    input: {
+        console.log(
+            ({a:{b:1},a:1}) + 1,
+            ({a:{b:1},a:1}).a + 1,
+            ({a:{b:1},a:1}).b + 1,
+            ({a:{b:1},a:1}).a.b + 1
+        );
+    }
+    expect: {
+        console.log(
+            ({a:{b:1},a:1}) + 1,
+            2,
+            ({a:{b:1},a:1}).b + 1,
+            1..b + 1
+        );
+    }
+}
+
+unsafe_object_accessor: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        unsafe: true,
+    }
+    input: {
+        function f() {
+            var a = {
+                get b() {},
+                set b() {}
+            };
+            return {a:a};
+        }
+    }
+    expect: {
+        function f() {
+            var a = {
+                get b() {},
+                set b() {}
+            };
+            return {a:a};
+        }
+    }
+}
+
+unsafe_function: {
+    options = {
+        evaluate  : true,
+        unsafe    : true
+    }
+    input: {
+        console.log(
+            ({a:{b:1},b:function(){}}) + 1,
+            ({a:{b:1},b:function(){}}).a + 1,
+            ({a:{b:1},b:function(){}}).b + 1,
+            ({a:{b:1},b:function(){}}).a.b + 1
+        );
+    }
+    expect: {
+        console.log(
+            ({a:{b:1},b:function(){}}) + 1,
+            ({a:{b:1},b:function(){}}).a + 1,
+            ({a:{b:1},b:function(){}}).b + 1,
+            ({a:{b:1},b:function(){}}).a.b + 1
+        );
+    }
+}
+
+unsafe_integer_key: {
+    options = {
+        evaluate  : true,
+        unsafe    : true
+    }
+    input: {
+        console.log(
+            ({0:1}) + 1,
+            ({0:1})[0] + 1,
+            ({0:1})["0"] + 1,
+            ({0:1})[1] + 1,
+            ({0:1})[0][1] + 1,
+            ({0:1})[0]["1"] + 1
+        );
+    }
+    expect: {
+        console.log(
+            ({0:1}) + 1,
+            2,
+            2,
+            ({0:1})[1] + 1,
+            1[1] + 1,
+            1["1"] + 1
+        );
+    }
+}
+
+unsafe_integer_key_complex: {
+    options = {
+        evaluate  : true,
+        unsafe    : true
+    }
+    input: {
+        console.log(
+            ({0:{1:1},1:1}) + 1,
+            ({0:{1:1},1:1})[0] + 1,
+            ({0:{1:1},1:1})["0"] + 1,
+            ({0:{1:1},1:1})[1] + 1,
+            ({0:{1:1},1:1})[0][1] + 1,
+            ({0:{1:1},1:1})[0]["1"] + 1
+        );
+    }
+    expect: {
+        console.log(
+            ({0:{1:1},1:1}) + 1,
+            "[object Object]1",
+            "[object Object]1",
+            2,
+            2,
+            2
+        );
+    }
+}
+
+unsafe_float_key: {
+    options = {
+        evaluate  : true,
+        unsafe    : true
+    }
+    input: {
+        console.log(
+            ({2.72:1}) + 1,
+            ({2.72:1})[2.72] + 1,
+            ({2.72:1})["2.72"] + 1,
+            ({2.72:1})[3.14] + 1,
+            ({2.72:1})[2.72][3.14] + 1,
+            ({2.72:1})[2.72]["3.14"] + 1
+        );
+    }
+    expect: {
+        console.log(
+            ({2.72:1}) + 1,
+            2,
+            2,
+            ({2.72:1})[3.14] + 1,
+            1[3.14] + 1,
+            1["3.14"] + 1
+        );
+    }
+}
+
+unsafe_float_key_complex: {
+    options = {
+        evaluate  : true,
+        unsafe    : true
+    }
+    input: {
+        console.log(
+            ({2.72:{3.14:1},3.14:1}) + 1,
+            ({2.72:{3.14:1},3.14:1})[2.72] + 1,
+            ({2.72:{3.14:1},3.14:1})["2.72"] + 1,
+            ({2.72:{3.14:1},3.14:1})[3.14] + 1,
+            ({2.72:{3.14:1},3.14:1})[2.72][3.14] + 1,
+            ({2.72:{3.14:1},3.14:1})[2.72]["3.14"] + 1
+        );
+    }
+    expect: {
+        console.log(
+            "[object Object]1",
+            "[object Object]1",
+            "[object Object]1",
+            2,
+            2,
+            2
+        );
+    }
+}
+
+unsafe_array: {
+    options = {
+        evaluate  : true,
+        unsafe    : true
+    }
+    input: {
+        console.log(
+            [1, , 3][1],
+            [1, 2, 3, a] + 1,
+            [1, 2, 3, 4] + 1,
+            [1, 2, 3, a][0] + 1,
+            [1, 2, 3, 4][0] + 1,
+            [1, 2, 3, 4][6 - 5] + 1,
+            [1, , 3, 4][6 - 5] + 1,
+            [[1, 2], [3, 4]][0] + 1,
+            [[1, 2], [3, 4]][6 - 5][1] + 1,
+            [[1, 2], , [3, 4]][6 - 5][1] + 1
+        );
+    }
+    expect: {
+        console.log(
+            void 0,
+            [1, 2, 3, a] + 1,
+            "1,2,3,41",
+            [1, 2, 3, a][0] + 1,
+            2,
+            3,
+            NaN,
+            "1,21",
+            5,
+            (void 0)[1] + 1
+        );
+    }
+}
+
+unsafe_string: {
+    options = {
+        evaluate  : true,
+        unsafe    : true
+    }
+    input: {
+        console.log(
+            "1234" + 1,
+            "1234"[0] + 1,
+            "1234"[6 - 5] + 1,
+            ("12" + "34")[0] + 1,
+            ("12" + "34")[6 - 5] + 1,
+            [1, 2, 3, 4].join("")[0] + 1
+        );
+    }
+    expect: {
+        console.log(
+            "12341",
+            "11",
+            "21",
+            "11",
+            "21",
+            "11"
+        );
+    }
+}
+
+unsafe_array_bad_index: {
+    options = {
+        evaluate  : true,
+        unsafe    : true
+    }
+    input: {
+        console.log(
+            [1, 2, 3, 4].a + 1,
+            [1, 2, 3, 4]["a"] + 1,
+            [1, 2, 3, 4][3.14] + 1
+        );
+    }
+    expect: {
+        console.log(
+            [1, 2, 3, 4].a + 1,
+            [1, 2, 3, 4]["a"] + 1,
+            [1, 2, 3, 4][3.14] + 1
+        );
+    }
+}
+
+unsafe_string_bad_index: {
+    options = {
+        evaluate  : true,
+        unsafe    : true
+    }
+    input: {
+        console.log(
+            "1234".a + 1,
+            "1234"["a"] + 1,
+            "1234"[3.14] + 1
+        );
+    }
+    expect: {
+        console.log(
+            "1234".a + 1,
+            "1234"["a"] + 1,
+            "1234"[3.14] + 1
+        );
+    }
+}
+
+unsafe_prototype_function: {
+    options = {
+        evaluate  : true,
+        unsafe    : true
+    }
+    input: {
+        var a = ({valueOf: 0}) < 1;
+        var b = ({toString: 0}) < 1;
+        var c = ({valueOf: 0}) + "";
+        var d = ({toString: 0}) + "";
+        var e = (({valueOf: 0}) + "")[2];
+        var f = (({toString: 0}) + "")[2];
+        var g = ({valueOf: 0}).valueOf();
+        var h = ({toString: 0}).toString();
+    }
+    expect: {
+        var a = ({valueOf: 0}) < 1;
+        var b = ({toString: 0}) < 1;
+        var c = ({valueOf: 0}) + "";
+        var d = ({toString: 0}) + "";
+        var e = (({valueOf: 0}) + "")[2];
+        var f = (({toString: 0}) + "")[2];
+        var g = ({valueOf: 0}).valueOf();
+        var h = "" + ({toString: 0});
+    }
+}
+
+call_args: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+    }
+    input: {
+        const a = 1;
+        console.log(a);
+        +function(a) {
+            return a;
+        }(a);
+    }
+    expect: {
+        const a = 1;
+        console.log(1);
+        +(1, 1);
+    }
+}
+
+call_args_drop_param: {
+    options = {
+        evaluate: true,
+        keep_fargs: false,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        const a = 1;
+        console.log(a);
+        +function(a) {
+            return a;
+        }(a, b);
+    }
+    expect: {
+        const a = 1;
+        console.log(1);
+        +(b, 1);
+    }
+}
+
+in_boolean_context: {
+    options = {
+        booleans: true,
+        evaluate: true,
+        sequences: true,
+        side_effects: true,
+    }
+    input: {
+        console.log(
+            !42,
+            !"foo",
+            ![1, 2],
+            !/foo/,
+            !b(42),
+            !b("foo"),
+            !b([1, 2]),
+            !b(/foo/),
+            ![1, foo()],
+            ![1, foo(), 2]
+        );
+    }
+    expect: {
+        console.log(
+            !1,
+            !1,
+            !1,
+            !1,
+            !b(42),
+            !b("foo"),
+            !b([1, 2]),
+            !b(/foo/),
+            ![1, foo()],
+            (foo(), !1)
+        );
+    }
+}

test/compress/functions.js

@@ -0,0 +1,93 @@
+non_ascii_function_identifier_name: {
+    input: {
+        function fooλ(δλ) {}
+        function λ(δλ) {}
+        (function λ(δλ) {})()
+    }
+    expect_exact: "function fooλ(δλ){}function λ(δλ){}(function λ(δλ){})();"
+}
+
+iifes_returning_constants_keep_fargs_true: {
+    options = {
+        keep_fargs    : true,
+        side_effects  : true,
+        evaluate      : true,
+        unused        : true,
+        dead_code     : true,
+        conditionals  : true,
+        comparisons   : true,
+        booleans      : true,
+        if_return     : true,
+        join_vars     : true,
+        reduce_vars   : true,
+        cascade       : true,
+    }
+    input: {
+        (function(){ return -1.23; }());
+        console.log( function foo(){ return "okay"; }() );
+        console.log( function foo(x, y, z){ return 123; }() );
+        console.log( function(x, y, z){ return z; }() );
+        console.log( function(x, y, z){ if (x) return y; return z; }(1, 2, 3) );
+        console.log( function(x, y){ return x * y; }(2, 3) );
+        console.log( function(x, y){ return x * y; }(2, 3, a(), b()) );
+    }
+    expect: {
+        console.log("okay");
+        console.log(123);
+        console.log(void 0);
+        console.log(2);
+        console.log(6);
+        console.log((a(), b(), 6));
+    }
+}
+
+iifes_returning_constants_keep_fargs_false: {
+    options = {
+        keep_fargs    : false,
+        side_effects  : true,
+        evaluate      : true,
+        unused        : true,
+        dead_code     : true,
+        conditionals  : true,
+        comparisons   : true,
+        booleans      : true,
+        if_return     : true,
+        join_vars     : true,
+        reduce_vars   : true,
+        cascade       : true,
+    }
+    input: {
+        (function(){ return -1.23; }());
+        console.log( function foo(){ return "okay"; }() );
+        console.log( function foo(x, y, z){ return 123; }() );
+        console.log( function(x, y, z){ return z; }() );
+        console.log( function(x, y, z){ if (x) return y; return z; }(1, 2, 3) );
+        console.log( function(x, y){ return x * y; }(2, 3) );
+        console.log( function(x, y){ return x * y; }(2, 3, a(), b()) );
+    }
+    expect: {
+        console.log("okay");
+        console.log(123);
+        console.log(void 0);
+        console.log(2);
+        console.log(6);
+        console.log((a(), b(), 6));
+    }
+}
+
+issue_485_crashing_1530: {
+    options = {
+        conditionals: true,
+        dead_code: true,
+        evaluate: true,
+    }
+    input: {
+        (function(a) {
+            if (true) return;
+            var b = 42;
+        })(this);
+    }
+    expect: {
+        this, void 0;
+    }
+}

test/compress/global_defs.js

@@ -0,0 +1,147 @@
+must_replace: {
+    options = {
+        global_defs: {
+            D: "foo bar",
+        }
+    }
+    input: {
+        console.log(D);
+    }
+    expect: {
+        console.log("foo bar");
+    }
+}
+
+keyword: {
+    options = {
+        global_defs: {
+            undefined: 0,
+            NaN: 1,
+            Infinity: 2,
+        },
+    }
+    input: {
+        console.log(undefined, NaN, Infinity);
+    }
+    expect: {
+        console.log(0, 1, 2);
+    }
+}
+
+object: {
+    options = {
+        evaluate: true,
+        global_defs: {
+            CONFIG: {
+                DEBUG: [ 0 ],
+                VALUE: 42,
+            },
+        },
+        unsafe: true,
+    }
+    input: {
+        function f(CONFIG) {
+            // CONFIG not global - do not replace
+            return CONFIG.VALUE;
+        }
+        function g() {
+            var CONFIG = { VALUE: 1 };
+            // CONFIG not global - do not replace
+            return CONFIG.VALUE;
+        }
+        function h() {
+            return CONFIG.VALUE;
+        }
+        if (CONFIG.DEBUG[0])
+            console.debug("foo");
+    }
+    expect: {
+        function f(CONFIG) {
+            return CONFIG.VALUE;
+        }
+        function g() {
+            var CONFIG = { VALUE: 1 };
+            return CONFIG.VALUE;
+        }
+        function h() {
+            return 42;
+        }
+        if (0)
+            console.debug("foo");
+    }
+}
+
+expanded: {
+    options = {
+        global_defs: {
+            "CONFIG.DEBUG": [ 0 ],
+            "CONFIG.VALUE": 42,
+        },
+    }
+    input: {
+        function f(CONFIG) {
+            // CONFIG not global - do not replace
+            return CONFIG.VALUE;
+        }
+        function g() {
+            var CONFIG = { VALUE: 1 };
+            // CONFIG not global - do not replace
+            return CONFIG.VALUE;
+        }
+        function h() {
+            return CONFIG.VALUE;
+        }
+        if (CONFIG.DEBUG[0])
+            console.debug("foo");
+    }
+    expect: {
+        function f(CONFIG) {
+            return CONFIG.VALUE;
+        }
+        function g() {
+            var CONFIG = { VALUE: 1 };
+            return CONFIG.VALUE;
+        }
+        function h() {
+            return 42;
+        }
+        if ([0][0])
+            console.debug("foo");
+    }
+}
+
+mixed: {
+    options = {
+        evaluate: true,
+        global_defs: {
+            "CONFIG.VALUE": 42,
+            "FOO.BAR": "moo",
+        },
+        properties: true,
+    }
+    input: {
+        const FOO = { BAR: 0 };
+        console.log(FOO.BAR);
+        console.log(++CONFIG.DEBUG);
+        console.log(++CONFIG.VALUE);
+        console.log(++CONFIG["VAL" + "UE"]);
+        console.log(++DEBUG[CONFIG.VALUE]);
+        CONFIG.VALUE.FOO = "bar";
+        console.log(CONFIG);
+    }
+    expect: {
+        const FOO = { BAR: 0 };
+        console.log("moo");
+        console.log(++CONFIG.DEBUG);
+        console.log(++CONFIG.VALUE);
+        console.log(++CONFIG.VALUE);
+        console.log(++DEBUG[42]);
+        CONFIG.VALUE.FOO = "bar";
+        console.log(CONFIG);
+    }
+    expect_warnings: [
+        'WARN: global_defs CONFIG.VALUE redefined [test/compress/global_defs.js:126,22]',
+        'WARN: global_defs CONFIG.VALUE redefined [test/compress/global_defs.js:127,22]',
+        'WARN: global_defs CONFIG.VALUE redefined [test/compress/global_defs.js:129,8]',
+    ]
+}

test/compress/harmony.js

@@ -200,7 +200,7 @@ export_statement: {
 }
 
 import_statement_mangling: {
-    mangle = { };
+    mangle = { toplevel: true };
     input: {
         import Foo from "foo";
         import Bar, {Food} from "lel";

test/compress/hoist_vars.js

@@ -0,0 +1,90 @@
+statements: {
+    options = {
+        hoist_funs: false,
+        hoist_vars: true,
+    }
+    input: {
+        function f() {
+            var a = 1;
+            var b = 2;
+            var c = 3;
+            function g() {}
+            return g(a, b, c);
+        }
+    }
+    expect: {
+        function f() {
+            var a = 1, b = 2, c = 3;
+            function g() {}
+            return g(a, b, c);
+        }
+    }
+}
+
+statements_funs: {
+    options = {
+        hoist_funs: true,
+        hoist_vars: true,
+    }
+    input: {
+        function f() {
+            var a = 1;
+            var b = 2;
+            var c = 3;
+            function g() {}
+            return g(a, b, c);
+        }
+    }
+    expect: {
+        function f() {
+            function g() {}
+            var a = 1, b = 2, c = 3;
+            return g(a, b, c);
+        }
+    }
+}
+
+sequences: {
+    options = {
+        hoist_funs: false,
+        hoist_vars: true,
+    }
+    input: {
+        function f() {
+            var a = 1, b = 2;
+            function g() {}
+            var c = 3;
+            return g(a, b, c);
+        }
+    }
+    expect: {
+        function f() {
+            var c, a = 1, b = 2;
+            function g() {}
+            c = 3;
+            return g(a, b, c);
+        }
+    }
+}
+
+sequences_funs: {
+    options = {
+        hoist_funs: true,
+        hoist_vars: true,
+    }
+    input: {
+        function f() {
+            var a = 1, b = 2;
+            function g() {}
+            var c = 3;
+            return g(a, b, c);
+        }
+    }
+    expect: {
+        function f() {
+            function g() {}
+            var a = 1, b = 2, c = 3;
+            return g(a, b, c);
+        }
+    }
+}

test/compress/if_return.js

@@ -170,8 +170,51 @@ if_return_7: {
         }
     }
     expect: {
-        // suboptimal
-        function f(x){return!!x||(foo(),void bar())}
+        function f(x){if(x)return!0;foo(),bar()}
+    }
+}
+
+if_return_8: {
+    options = {
+        if_return:     true,
+        sequences:     true,
+        conditionals:  true,
+        side_effects : true,
+    }
+    input: {
+        function f(e) {
+            if (2 == e) return foo();
+            if (3 == e) return bar();
+            if (4 == e) return baz();
+            fail(e);
+        }
+
+        function g(e) {
+            if (a(e)) return foo();
+            if (b(e)) return bar();
+            if (c(e)) return baz();
+            fail(e);
+        }
+
+        function h(e) {
+            if (a(e)) return foo();
+            else if (b(e)) return bar();
+            else if (c(e)) return baz();
+            else fail(e);
+        }
+
+        function i(e) {
+            if (a(e)) return foo();
+            else if (b(e)) return bar();
+            else if (c(e)) return baz();
+            fail(e);
+        }
+    }
+    expect: {
+        function f(e){return 2==e?foo():3==e?bar():4==e?baz():void fail(e)}
+        function g(e){return a(e)?foo():b(e)?bar():c(e)?baz():void fail(e)}
+        function h(e){return a(e)?foo():b(e)?bar():c(e)?baz():void fail(e)}
+        function i(e){return a(e)?foo():b(e)?bar():c(e)?baz():void fail(e)}
     }
 }
 
@@ -205,3 +248,57 @@ issue_1089: {
         }
     }
 }
+
+issue_1437: {
+    options = {
+        if_return    : true,
+        sequences    : true,
+        conditionals : false
+    }
+    input: {
+        function x() {
+            if (a())
+                return b();
+            if (c())
+                return d();
+            else
+                e();
+            f();
+        }
+    }
+    expect: {
+        function x() {
+            if (a())
+                return b();
+            if (c())
+                return d();
+            else
+                e()
+            f();
+        }
+    }
+}
+
+issue_1437_conditionals: {
+    options = {
+        conditionals : true,
+        if_return    : true,
+        sequences    : true
+    }
+    input: {
+        function x() {
+            if (a())
+                return b();
+            if (c())
+                return d();
+            else
+                e();
+            f();
+        }
+    }
+    expect: {
+        function x() {
+            return a() ? b() : c() ? d() : (e(), f(), void 0);
+        }
+    }
+}

test/compress/issue-1041.js

@@ -13,7 +13,8 @@ const_declaration: {
 
 const_pragma: {
     options = {
-        evaluate: true
+        evaluate: true,
+        reduce_vars: true,
     };
 
     input: {
@@ -27,7 +28,8 @@ const_pragma: {
 // for completeness' sake
 not_const: {
     options = {
-        evaluate: true
+        evaluate: true,
+        reduce_vars: true,
     };
 
     input: {

test/compress/issue-105.js

@@ -1,25 +0,0 @@
-typeof_eq_undefined: {
-    options = {
-        comparisons: true
-    };
-    input: { a = typeof b.c != "undefined" }
-    expect: { a = "undefined" != typeof b.c }
-}
-
-typeof_eq_undefined_unsafe: {
-    options = {
-        comparisons: true,
-        unsafe: true
-    };
-    input: { a = typeof b.c != "undefined" }
-    expect: { a = void 0 !== b.c }
-}
-
-typeof_eq_undefined_unsafe2: {
-    options = {
-        comparisons: true,
-        unsafe: true
-    };
-    input: { a = "undefined" != typeof b.c }
-    expect: { a = void 0 !== b.c }
-}

test/compress/issue-1261.js

@@ -0,0 +1,176 @@
+pure_function_calls: {
+    options = {
+        evaluate     : true,
+        conditionals : true,
+        comparisons  : true,
+        side_effects : true,
+        booleans     : true,
+        unused       : true,
+        if_return    : true,
+        join_vars    : true,
+        cascade      : true,
+        negate_iife  : true,
+    }
+    input: {
+        // pure top-level IIFE will be dropped
+        // @__PURE__ - comment
+        (function() {
+            console.log("iife0");
+        })();
+
+        // pure top-level IIFE assigned to unreferenced var will not be dropped
+        var iife1 = /*@__PURE__*/(function() {
+            console.log("iife1");
+            function iife1() {}
+            return iife1;
+        })();
+
+        (function(){
+            // pure IIFE in function scope assigned to unreferenced var will be dropped
+            var iife2 = /*#__PURE__*/(function() {
+                console.log("iife2");
+                function iife2() {}
+                return iife2;
+            })();
+        })();
+
+        // comment #__PURE__ comment
+        bar(), baz(), quux();
+        a.b(), /* @__PURE__ */ c.d.e(), f.g();
+    }
+    expect: {
+        var iife1 = function() {
+            console.log("iife1");
+            function iife1() {}
+            return iife1;
+        }();
+
+        baz(), quux();
+        a.b(), f.g();
+    }
+    expect_warnings: [
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:17,8]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:17,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:30,37]",
+        "WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:30,16]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:28,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:38,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:39,31]",
+    ]
+}
+
+pure_function_calls_toplevel: {
+    options = {
+        evaluate     : true,
+        conditionals : true,
+        comparisons  : true,
+        side_effects : true,
+        booleans     : true,
+        unused       : true,
+        if_return    : true,
+        join_vars    : true,
+        cascade      : true,
+        negate_iife  : true,
+        toplevel     : true,
+    }
+    input: {
+        // pure top-level IIFE will be dropped
+        // @__PURE__ - comment
+        (function() {
+            console.log("iife0");
+        })();
+
+        // pure top-level IIFE assigned to unreferenced var will be dropped
+        var iife1 = /*@__PURE__*/(function() {
+            console.log("iife1");
+            function iife1() {}
+            return iife1;
+        })();
+
+        (function(){
+            // pure IIFE in function scope assigned to unreferenced var will be dropped
+            var iife2 = /*#__PURE__*/(function() {
+                console.log("iife2");
+                function iife2() {}
+                return iife2;
+            })();
+        })();
+
+        // comment #__PURE__ comment
+        bar(), baz(), quux();
+        a.b(), /* @__PURE__ */ c.d.e(), f.g();
+    }
+    expect: {
+        baz(), quux();
+        a.b(), f.g();
+    }
+    expect_warnings: [
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:79,8]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:79,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:92,37]",
+        "WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:92,16]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:90,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:100,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:101,31]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:84,33]",
+        "WARN: Dropping unused variable iife1 [test/compress/issue-1261.js:84,12]",
+    ]
+}
+
+should_warn: {
+    options = {
+        booleans: true,
+        conditionals: true,
+        evaluate: true,
+        side_effects: true,
+    }
+    input: {
+        /* @__PURE__ */(function(){x})(), void/* @__PURE__ */(function(){y})();
+        /* @__PURE__ */(function(){x})() || true ? foo() : bar();
+        true || /* @__PURE__ */(function(){y})() ? foo() : bar();
+        /* @__PURE__ */(function(){x})() && false ? foo() : bar();
+        false && /* @__PURE__ */(function(){y})() ? foo() : bar();
+        /* @__PURE__ */(function(){x})() + "foo" ? bar() : baz();
+        "foo" + /* @__PURE__ */(function(){y})() ? bar() : baz();
+        /* @__PURE__ */(function(){x})() ? foo() : foo();
+        [/* @__PURE__ */(function(){x})()] ? foo() : bar();
+        !{ foo: /* @__PURE__ */(function(){x})() } ? bar() : baz();
+    }
+    expect: {
+        foo();
+        foo();
+        bar();
+        bar();
+        bar();
+        bar();
+        foo();
+        foo();
+        baz();
+    }
+    expect_warnings: [
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:128,61]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:128,23]",
+        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:128,23]",
+        "WARN: Boolean || always true [test/compress/issue-1261.js:129,23]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:129,23]",
+        "WARN: Condition always true [test/compress/issue-1261.js:129,23]",
+        "WARN: Boolean || always true [test/compress/issue-1261.js:130,8]",
+        "WARN: Condition always true [test/compress/issue-1261.js:130,8]",
+        "WARN: Boolean && always false [test/compress/issue-1261.js:131,23]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:131,23]",
+        "WARN: Condition always false [test/compress/issue-1261.js:131,23]",
+        "WARN: Boolean && always false [test/compress/issue-1261.js:132,8]",
+        "WARN: Condition always false [test/compress/issue-1261.js:132,8]",
+        "WARN: + in boolean context always true [test/compress/issue-1261.js:133,23]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:133,23]",
+        "WARN: Condition always true [test/compress/issue-1261.js:133,23]",
+        "WARN: + in boolean context always true [test/compress/issue-1261.js:134,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:134,31]",
+        "WARN: Condition always true [test/compress/issue-1261.js:134,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:135,23]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:136,24]",
+        "WARN: Condition always true [test/compress/issue-1261.js:136,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:137,31]",
+        "WARN: Condition always false [test/compress/issue-1261.js:137,8]",
+    ]
+}

test/compress/issue-1275.js

@@ -35,7 +35,7 @@ string_plus_optimization: {
                 throw "nope";
             }
             try {
-                console.log('0' + throwing_function() ? "yes" : "no");
+                console.log((throwing_function(), "yes"));
             } catch (ex) {
                 console.log(ex);
             }

test/compress/issue-1431.js

@@ -0,0 +1,151 @@
+level_zero: {
+    options = {
+        keep_fnames: true
+    }
+    mangle = {
+        keep_fnames: true
+    }
+    input: {
+        function f(x) {
+            function n(a) {
+                return a * a;
+            }
+            return function() {
+                return x;
+            };
+        }
+    }
+    expect: {
+        function f(r) {
+            function n(n) {
+                return n * n;
+            }
+            return function() {
+                return r;
+            };
+        }
+    }
+}
+
+level_one: {
+    options = {
+        keep_fnames: true
+    }
+    mangle = {
+        keep_fnames: true
+    }
+    input: {
+        function f(x) {
+            return function() {
+                function n(a) {
+                    return a * a;
+                }
+                return x(n);
+            };
+        }
+    }
+    expect: {
+        function f(r) {
+            return function() {
+                function n(n) {
+                    return n * n;
+                }
+                return r(n);
+            };
+        }
+    }
+}
+
+level_two: {
+    options = {
+        keep_fnames: true
+    }
+    mangle = {
+        keep_fnames: true
+    }
+    input: {
+        function f(x) {
+            return function() {
+                function r(a) {
+                    return a * a;
+                }
+                return function() {
+                    function n(a) {
+                        return a * a;
+                    }
+                    return x(n);
+                };
+            };
+        }
+    }
+    expect: {
+        function f(t) {
+            return function() {
+                function r(n) {
+                    return n * n;
+                }
+                return function() {
+                    function n(n) {
+                        return n * n;
+                    }
+                    return t(n);
+                };
+            };
+        }
+    }
+}
+
+level_three: {
+    options = {
+        keep_fnames: true
+    }
+    mangle = {
+        keep_fnames: true
+    }
+    input: {
+        function f(x) {
+            return function() {
+                function r(a) {
+                    return a * a;
+                }
+                return [
+                    function() {
+                        function t(a) {
+                            return a * a;
+                        }
+                        return t;
+                    },
+                    function() {
+                        function n(a) {
+                            return a * a;
+                        }
+                        return x(n);
+                    }
+                ];
+            };
+        }
+    }
+    expect: {
+        function f(t) {
+            return function() {
+                function r(n) {
+                    return n * n;
+                }
+                return [
+                    function() {
+                        function t(n) {
+                            return n * n;
+                        }
+                        return t;
+                    },
+                    function() {
+                        function n(n) {
+                            return n * n;
+                        }
+                        return t(n);
+                    }
+                ];
+            };
+        }
+    }
+}

test/compress/issue-1443.js

@@ -0,0 +1,61 @@
+// tests assume that variable `undefined` not redefined and has `void 0` as value
+
+unsafe_undefined: {
+    options = {
+        conditionals: true,
+        if_return: true,
+        unsafe: true
+    }
+    mangle = {}
+    input: {
+        function f(undefined) {
+            return function() {
+                if (a)
+                    return b;
+                if (c)
+                    return d;
+            };
+        }
+    }
+    expect: {
+        function f(n) {
+            return function() {
+                return a ? b : c ? d : n;
+            };
+        }
+    }
+}
+
+keep_fnames: {
+    options = {
+        conditionals: true,
+        if_return: true,
+        unsafe: true
+    }
+    mangle = {
+        keep_fnames: true
+    }
+    input: {
+        function f(undefined) {
+            return function() {
+                function n(a) {
+                    return a * a;
+                }
+                if (a)
+                    return b;
+                if (c)
+                    return d;
+            };
+        }
+    }
+    expect: {
+        function f(r) {
+            return function() {
+                function n(n) {
+                    return n * n;
+                }
+                return a ? b : c ? d : r;
+            };
+        }
+    }
+}

test/compress/issue-1446.js

@@ -0,0 +1,71 @@
+typeof_eq_undefined: {
+    options = {
+        comparisons: true
+    }
+    input: {
+        var a = typeof b != "undefined";
+        b = typeof a != "undefined";
+        var c = typeof d.e !== "undefined";
+        var f = "undefined" === typeof g;
+        g = "undefined" === typeof f;
+        var h = "undefined" == typeof i.j;
+    }
+    expect: {
+        var a = "undefined" != typeof b;
+        b = void 0 !== a;
+        var c = void 0 !== d.e;
+        var f = "undefined" == typeof g;
+        g = void 0 === f;
+        var h = void 0 === i.j;
+    }
+}
+
+typeof_eq_undefined_ie8: {
+    options = {
+        comparisons: true,
+        screw_ie8: false
+    }
+    input: {
+        var a = typeof b != "undefined";
+        b = typeof a != "undefined";
+        var c = typeof d.e !== "undefined";
+        var f = "undefined" === typeof g;
+        g = "undefined" === typeof f;
+        var h = "undefined" == typeof i.j;
+    }
+    expect: {
+        var a = "undefined" != typeof b;
+        b = void 0 !== a;
+        var c = "undefined" != typeof d.e;
+        var f = "undefined" == typeof g;
+        g = void 0 === f;
+        var h = "undefined" == typeof i.j;
+    }
+}
+
+undefined_redefined: {
+    options = {
+        comparisons: true
+    }
+    input: {
+        function f(undefined) {
+            var n = 1;
+            return typeof n == "undefined";
+        }
+    }
+    expect_exact: "function f(undefined){var n=1;return void 0===n}"
+}
+
+undefined_redefined_mangle: {
+    options = {
+        comparisons: true
+    }
+    mangle = {}
+    input: {
+        function f(undefined) {
+            var n = 1;
+            return typeof n == "undefined";
+        }
+    }
+    expect_exact: "function f(n){var r=1;return void 0===r}"
+}

test/compress/issue-1447.js

@@ -0,0 +1,45 @@
+else_with_empty_block: {
+    options = {}
+    input: {
+        if (x)
+            yes();
+        else {
+        }
+    }
+    expect_exact: "if(x)yes();"
+}
+
+else_with_empty_statement: {
+    options = {}
+    input: {
+        if (x)
+            yes();
+        else
+            ;
+    }
+    expect_exact: "if(x)yes();"
+}
+
+conditional_false_stray_else_in_loop: {
+    options = {
+        evaluate     : true,
+        comparisons  : true,
+        booleans     : true,
+        unused       : true,
+        loops        : true,
+        side_effects : true,
+        dead_code    : true,
+        hoist_vars   : true,
+        join_vars    : true,
+        if_return    : true,
+        cascade      : true,
+        conditionals : false,
+    }
+    input: {
+        for (var i = 1; i <= 4; ++i) {
+            if (i <= 2) continue;
+            console.log(i);
+        }
+    }
+    expect_exact: "for(var i=1;i<=4;++i)if(!(i<=2))console.log(i);"
+}

test/compress/issue-1466.js

@@ -0,0 +1,285 @@
+same_variable_in_multiple_for_loop: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: true,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        cascade: true,
+        side_effects: true,
+        collapse_vars: true
+    };
+    mangle = {};
+    input: {
+        for (let i = 0; i < 3; i++) {
+            let a = 100;
+            console.log(i, a);
+            for (let i = 0; i < 2; i++) {
+                console.log(i, a);
+                let c = 2;
+                console.log(c);
+            }
+        }
+    }
+    expect: {
+        for (let o = 0; o < 3; o++) {
+            let l = 100;
+            console.log(o, l);
+            for (let o = 0; o < 2; o++) {
+                console.log(o, l);
+                let c = 2;
+                console.log(c);
+            }
+        }
+    }
+}
+
+same_variable_in_multiple_forOf: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: true,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        cascade: true,
+        side_effects: true,
+        collapse_vars: true
+    };
+    mangle = {};
+    input: {
+        var test = [ "a", "b", "c" ];
+        for (let tmp of test) {
+            console.log(tmp);
+            let dd;
+            dd = [ "e", "f", "g" ];
+            for (let tmp of dd) {
+                console.log(tmp);
+            }
+        }
+    }
+    expect: {
+        var test = [ "a", "b", "c" ];
+        for (let o of test) {
+            console.log(o);
+            let e;
+            e = [ "e", "f", "g" ];
+            for (let o of e) 
+                console.log(o);
+        }
+    }
+}
+
+same_variable_in_multiple_forIn: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: false,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        cascade: true,
+        side_effects: true,
+        collapse_vars: true
+    };
+    mangle = {};
+    input: {
+        var test = [ "a", "b", "c" ];
+        for (let tmp in test) {
+            console.log(tmp);
+            let dd;
+            dd = [ "e", "f", "g" ];
+            for (let tmp in test) {
+                console.log(tmp);
+            }
+        }
+    }
+    expect: {
+        var test = [ "a", "b", "c" ];
+        for (let o in test) {
+            console.log(o);
+            let e;
+            e = [ "e", "f", "g" ];
+            for (let o in test)
+                console.log(o);
+        }
+    }
+}
+
+different_variable_in_multiple_for_loop: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: true,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        cascade: true,
+        side_effects: true,
+        collapse_vars: true
+    };
+    mangle = {};
+    input: {
+        for (let i = 0; i < 3; i++) {
+            let a = 100;
+            console.log(i, a);
+            for (let j = 0; j < 2; j++) {
+                console.log(j, a);
+                let c = 2;
+                console.log(c);
+            }
+        }
+    }
+    expect: {
+        for (let o = 0; o < 3; o++) {
+            let l = 100;
+            console.log(o, l);
+            for (let o = 0; o < 2; o++) {
+                console.log(o, l);
+                let c = 2;
+                console.log(c);
+            }
+        }
+    }
+}
+
+different_variable_in_multiple_forOf: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: true,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        cascade: true,
+        side_effects: true,
+        collapse_vars: true
+    };
+    mangle = {};
+    input: {
+        var test = [ "a", "b", "c" ];
+        for (let tmp of test) {
+            console.log(tmp);
+            let dd;
+            dd = [ "e", "f", "g" ];
+            for (let t of dd) {
+                console.log(t);
+            }
+        }
+    }
+    expect: {
+        var test = [ "a", "b", "c" ];
+        for (let o of test) {
+            console.log(o);
+            let e;
+            e = [ "e", "f", "g" ];
+            for (let o of e)
+                console.log(o);
+        }
+    }
+}
+
+different_variable_in_multiple_forIn: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: false,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        cascade: true,
+        side_effects: true,
+        collapse_vars: true
+    };
+    mangle = {};
+    input: {
+        var test = [ "a", "b", "c" ];
+        for (let tmp in test) {
+            console.log(tmp);
+            let dd;
+            dd = [ "e", "f", "g" ];
+            for (let t in test) {
+                console.log(t);
+            }
+        }
+    }
+    expect: {
+        var test = [ "a", "b", "c" ];
+        for (let o in test) {
+            console.log(o);
+            let e;
+            e = [ "e", "f", "g" ];
+            for (let o in test)
+                console.log(o);
+        }
+    }
+}
+
+more_variable_in_multiple_for: {
+    options = {
+        hoist_funs: true,
+        dead_code: true,
+        conditionals: true,
+        comparisons: true,
+        evaluate: true,
+        booleans: true,
+        loops: true,
+        unused: false,
+        keep_fargs: true,
+        if_return: true,
+        join_vars: true,
+        cascade: true,
+        side_effects: true,
+        collapse_vars: true
+    };
+    mangle = {};
+    input: {
+        for (let a = 9, i = 0; i < 20; i += a) {
+            let b = a++ + i;
+            console.log(a, b, i);
+            for (let k = b, m = b*b, i = 0; i < 10; i++) {
+                console.log(a, b, m, k, i);
+            }
+        }
+    }
+    expect: {
+        for (let o = 9, l = 0; l < 20; l += o) {
+            let c = o++ + l;
+            console.log(o, c, l);
+            for (let l = c, e = c * c, f = 0; f < 10; f++)
+                console.log(o, c, e, l, f);
+        }
+    }
+}
+

test/compress/issue-1569.js

@@ -0,0 +1,19 @@
+inner_reference: {
+    options = {
+        side_effects: true,
+    }
+    input: {
+        !function f(a) {
+            return a && f(a - 1) + a;
+        }(42);
+        !function g(a) {
+            return a;
+        }(42);
+    }
+    expect: {
+        !function f(a) {
+            return a && f(a - 1) + a;
+        }(42);
+        !void 0;
+    }
+}

test/compress/issue-203.js

@@ -13,7 +13,11 @@ compress_new_function: {
 
 compress_new_function_with_destruct: {
     options = {
-        unsafe: true
+        unsafe: true,
+        ecma: 6
+    }
+    beautify = {
+        ecma: 6
     }
     input: {
         new Function("aa, [bb]", 'return aa;');

test/compress/issue-208.js

@@ -1,11 +1,70 @@
 do_not_update_lhs: {
-    options = { global_defs: { DEBUG: false } };
-    input: { DEBUG = false; }
-    expect: { DEBUG = false; }
+    options = {
+        global_defs: { DEBUG: 0 }
+    }
+    input: {
+        DEBUG++;
+        DEBUG += 1;
+        DEBUG = 1;
+    }
+    expect: {
+        DEBUG++;
+        DEBUG += 1;
+        DEBUG = 1;
+    }
 }
 
 do_update_rhs: {
-    options = { global_defs: { DEBUG: false } };
-    input: { MY_DEBUG = DEBUG; }
-    expect: { MY_DEBUG = false; }
+    options = {
+        global_defs: { DEBUG: 0 }
+    }
+    input: {
+        MY_DEBUG = DEBUG;
+        MY_DEBUG += DEBUG;
+    }
+    expect: {
+        MY_DEBUG = 0;
+        MY_DEBUG += 0;
+    }
+}
+
+mixed: {
+    options = {
+        evaluate: true,
+        global_defs: {
+            DEBUG: 0,
+            ENV: 1,
+            FOO: 2,
+        }
+    }
+    input: {
+        const ENV = 3;
+        var FOO = 4;
+        f(ENV * 10);
+        --FOO;
+        DEBUG = 1;
+        DEBUG++;
+        DEBUG += 1;
+        f(DEBUG);
+        x = DEBUG;
+    }
+    expect: {
+        const ENV = 3;
+        var FOO = 4;
+        f(10);
+        --FOO;
+        DEBUG = 1;
+        DEBUG++;
+        DEBUG += 1;
+        f(0);
+        x = 0;
+    }
+    expect_warnings: [
+        'WARN: global_defs ENV redefined [test/compress/issue-208.js:41,14]',
+        'WARN: global_defs FOO redefined [test/compress/issue-208.js:42,12]',
+        'WARN: global_defs FOO redefined [test/compress/issue-208.js:44,10]',
+        'WARN: global_defs DEBUG redefined [test/compress/issue-208.js:45,8]',
+        'WARN: global_defs DEBUG redefined [test/compress/issue-208.js:46,8]',
+        'WARN: global_defs DEBUG redefined [test/compress/issue-208.js:47,8]',
+    ]
 }

test/compress/issue-368.js

@@ -0,0 +1,55 @@
+collapse: {
+    options = {
+        cascade: true,
+        sequences: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        function f1() {
+            var a;
+            a = typeof b === 'function' ? b() : b;
+            return a !== undefined && c();
+        }
+        function f2(b) {
+            var a;
+            b = c();
+            a = typeof b === 'function' ? b() : b;
+            return 'stirng' == typeof a && d();
+        }
+        function f3(c) {
+            var a;
+            a = b(a / 2);
+            if (a < 0) {
+                a++;
+                ++c;
+                return c / 2;
+            }
+        }
+        function f4(c) {
+            var a;
+            a = b(a / 2);
+            if (a < 0) {
+                a++;
+                c++;
+                return c / 2;
+            }
+        }
+    }
+    expect: {
+        function f1() {
+            return void 0 !== ('function' === typeof b ? b() : b) && c();
+        }
+        function f2(b) {
+            return b = c(), 'stirng' == typeof ('function' === typeof b ? b() : b) && d();
+        }
+        function f3(c) {
+            var a;
+            if ((a = b(a / 2)) < 0) return a++, ++c / 2;
+        }
+        function f4(c) {
+            var a;
+            if ((a = b(a / 2)) < 0) return a++, ++c / 2;
+        }
+    }
+}

test/compress/issue-640.js

@@ -0,0 +1,317 @@
+cond_5: {
+    options = {
+        conditionals: true,
+        expression: true,
+    }
+    input: {
+        if (some_condition()) {
+            if (some_other_condition()) {
+                do_something();
+            } else {
+                alternate();
+            }
+        } else {
+            alternate();
+        }
+
+        if (some_condition()) {
+            if (some_other_condition()) {
+                do_something();
+            }
+        }
+    }
+    expect: {
+        some_condition() && some_other_condition() ? do_something() : alternate();
+        if (some_condition() && some_other_condition()) do_something();
+    }
+}
+
+dead_code_const_annotation_regex: {
+    options = {
+        booleans     : true,
+        conditionals : true,
+        dead_code    : true,
+        evaluate     : true,
+        expression   : true,
+        loops        : true,
+    }
+    input: {
+        var unused;
+        // @constraint this shouldn't be a constant
+        var CONST_FOO_ANN = false;
+        if (CONST_FOO_ANN) {
+            console.log("reachable");
+        }
+    }
+    expect: {
+        var unused;
+        var CONST_FOO_ANN = !1;
+        if (CONST_FOO_ANN) console.log('reachable');
+    }
+}
+
+drop_console_2: {
+    options = {
+        drop_console: true,
+        expression: true,
+    }
+    input: {
+        console.log('foo');
+        console.log.apply(console, arguments);
+    }
+    expect: {
+        // with regular compression these will be stripped out as well
+        void 0;
+        void 0;
+    }
+}
+
+drop_value: {
+    options = {
+        expression: true,
+        side_effects: true,
+    }
+    input: {
+        (1, [2, foo()], 3, {a:1, b:bar()});
+    }
+    expect: {
+        foo(), {a:1, b:bar()};
+    }
+}
+
+wrongly_optimized: {
+    options = {
+        conditionals: true,
+        booleans: true,
+        evaluate: true,
+        expression: true,
+    }
+    input: {
+        function func() {
+            foo();
+        }
+        if (func() || true) {
+            bar();
+        }
+    }
+    expect: {
+        function func() {
+            foo();
+        }
+        // TODO: optimize to `func(), bar()`
+        if (func(), !0) bar();
+    }
+}
+
+negate_iife_1: {
+    options = {
+        expression: true,
+        negate_iife: true,
+    }
+    input: {
+        (function(){ stuff() })();
+    }
+    expect: {
+        (function(){ stuff() })();
+    }
+}
+
+negate_iife_3: {
+    options = {
+        conditionals: true,
+        expression: true,
+        negate_iife: true,
+    }
+    input: {
+        (function(){ return t })() ? console.log(true) : console.log(false);
+    }
+    expect: {
+        (function(){ return t })() ? console.log(true) : console.log(false);
+    }
+}
+
+negate_iife_3_off: {
+    options = {
+        conditionals: true,
+        expression: true,
+        negate_iife: false,
+    }
+    input: {
+        (function(){ return t })() ? console.log(true) : console.log(false);
+    }
+    expect: {
+        (function(){ return t })() ? console.log(true) : console.log(false);
+    }
+}
+
+negate_iife_4: {
+    options = {
+        conditionals: true,
+        expression: true,
+        negate_iife: true,
+        sequences: true,
+    }
+    input: {
+        (function(){ return t })() ? console.log(true) : console.log(false);
+        (function(){
+            console.log("something");
+        })();
+    }
+    expect: {
+        (function(){ return t })() ? console.log(true) : console.log(false), function(){
+            console.log("something");
+        }();
+    }
+}
+
+negate_iife_5: {
+    options = {
+        conditionals: true,
+        expression: true,
+        negate_iife: true,
+        sequences: true,
+    }
+    input: {
+        if ((function(){ return t })()) {
+            foo(true);
+        } else {
+            bar(false);
+        }
+        (function(){
+            console.log("something");
+        })();
+    }
+    expect: {
+        (function(){ return t })() ? foo(true) : bar(false), function(){
+            console.log("something");
+        }();
+    }
+}
+
+negate_iife_5_off: {
+    options = {
+        conditionals: true,
+        expression: true,
+        negate_iife: false,
+        sequences: true,
+    };
+    input: {
+        if ((function(){ return t })()) {
+            foo(true);
+        } else {
+            bar(false);
+        }
+        (function(){
+            console.log("something");
+        })();
+    }
+    expect: {
+        (function(){ return t })() ? foo(true) : bar(false), function(){
+            console.log("something");
+        }();
+    }
+}
+
+issue_1254_negate_iife_true: {
+    options = {
+        expression: true,
+        negate_iife: true,
+    }
+    input: {
+        (function() {
+            return function() {
+                console.log('test')
+            };
+        })()();
+    }
+    expect_exact: '(function(){return function(){console.log("test")}})()();'
+}
+
+issue_1254_negate_iife_nested: {
+    options = {
+        expression: true,
+        negate_iife: true,
+    }
+    input: {
+        (function() {
+            return function() {
+                console.log('test')
+            };
+        })()()()()();
+    }
+    expect_exact: '(function(){return function(){console.log("test")}})()()()()();'
+}
+
+conditional: {
+    options = {
+        expression: true,
+        pure_funcs: [ "pure" ],
+        side_effects: true,
+    }
+    input: {
+        pure(1 | a() ? 2 & b() : 7 ^ c());
+        pure(1 | a() ? 2 & b() : 5);
+        pure(1 | a() ? 4 : 7 ^ c());
+        pure(1 | a() ? 4 : 5);
+        pure(3 ? 2 & b() : 7 ^ c());
+        pure(3 ? 2 & b() : 5);
+        pure(3 ? 4 : 7 ^ c());
+        pure(3 ? 4 : 5);
+    }
+    expect: {
+        1 | a() ? b() : c();
+        1 | a() && b();
+        1 | a() || c();
+        a();
+        3 ? b() : c();
+        3 && b();
+        3 || c();
+        pure(3 ? 4 : 5);
+    }
+}
+
+limit_1: {
+    options = {
+        expression: true,
+        sequences: 3,
+    }
+    input: {
+        a;
+        b;
+        c;
+        d;
+        e;
+        f;
+        g;
+        h;
+        i;
+        j;
+        k;
+    }
+    expect: {
+        // Turned into a single return statement
+        // so it can no longer be split into lines
+        a,b,c,d,e,f,g,h,i,j,k;
+    }
+}
+
+iife: {
+    options = {
+        expression: true,
+        sequences: true,
+    }
+    input: {
+        x = 42;
+        (function a() {})();
+        !function b() {}();
+        ~function c() {}();
+        +function d() {}();
+        -function e() {}();
+        void function f() {}();
+        typeof function g() {}();
+    }
+    expect: {
+        x = 42, function a() {}(), function b() {}(), function c() {}(),
+        function d() {}(), function e() {}(), function f() {}(), typeof function g() {}();
+    }
+}

test/compress/issue-979.js

@@ -82,7 +82,7 @@ issue979_test_negated_is_best: {
             1!=a||2!=b||foo();
         }
         function f7() {
-            return 1!=a&&2!=b?bar():void foo();
+            if(1!=a&&2!=b)return bar();foo()
         }
     }
 }

test/compress/loops.js

@@ -187,3 +187,212 @@ keep_collapse_const_in_own_block_scope_2: {
         console.log(c);
     }
 }
+
+evaluate: {
+    options = {
+        loops: true,
+        dead_code: true,
+        evaluate: true,
+    };
+    input: {
+        while (true) {
+            a();
+        }
+        while (false) {
+            b();
+        }
+        do {
+            c();
+        } while (true);
+        do {
+            d();
+        } while (false);
+    }
+    expect: {
+        for(;;)
+            a();
+        for(;;)
+            c();
+        // rule disabled due to issue_1532
+        do d(); while (false);
+    }
+}
+
+issue_1532: {
+    options = {
+        evaluate: true,
+        loops: true,
+    }
+    input: {
+        function f(x, y) {
+            do {
+                if (x) break;
+                foo();
+            } while (false);
+        }
+    }
+    expect: {
+        function f(x, y) {
+            do {
+                if (x) break;
+                foo();
+            } while (false);
+        }
+    }
+}
+
+issue_186: {
+    beautify = {
+        beautify: false,
+        screw_ie8: true,
+    }
+    input: {
+        var x = 3;
+        if (foo())
+            do
+                do
+                    alert(x);
+                while (--x);
+            while (x);
+        else
+            bar();
+    }
+    expect_exact: 'var x=3;if(foo())do{do{alert(x)}while(--x)}while(x);else bar();'
+}
+
+issue_186_ie8: {
+    beautify = {
+        beautify: false,
+        screw_ie8: false,
+    }
+    input: {
+        var x = 3;
+        if (foo())
+            do
+                do
+                    alert(x);
+                while (--x);
+            while (x);
+        else
+            bar();
+    }
+    expect_exact: 'var x=3;if(foo()){do{do{alert(x)}while(--x)}while(x)}else bar();'
+}
+
+issue_186_beautify: {
+    beautify = {
+        beautify: true,
+        screw_ie8: true,
+    }
+    input: {
+        var x = 3;
+        if (foo())
+            do
+                do
+                    alert(x);
+                while (--x);
+            while (x);
+        else
+            bar();
+    }
+    expect_exact: 'var x = 3;\n\nif (foo()) do {\n    do {\n        alert(x);\n    } while (--x);\n} while (x); else bar();'
+}
+
+issue_186_beautify_ie8: {
+    beautify = {
+        beautify: true,
+        screw_ie8: false,
+    }
+    input: {
+        var x = 3;
+        if (foo())
+            do
+                do
+                    alert(x);
+                while (--x);
+            while (x);
+        else
+            bar();
+    }
+    expect_exact: 'var x = 3;\n\nif (foo()) {\n    do {\n        do {\n            alert(x);\n        } while (--x);\n    } while (x);\n} else bar();'
+}
+
+issue_186_bracketize: {
+    beautify = {
+        beautify: false,
+        bracketize: true,
+        screw_ie8: true,
+    }
+    input: {
+        var x = 3;
+        if (foo())
+            do
+                do
+                    alert(x);
+                while (--x);
+            while (x);
+        else
+            bar();
+    }
+    expect_exact: 'var x=3;if(foo()){do{do{alert(x)}while(--x)}while(x)}else{bar()}'
+}
+
+issue_186_bracketize_ie8: {
+    beautify = {
+        beautify: false,
+        bracketize: true,
+        screw_ie8: false,
+    }
+    input: {
+        var x = 3;
+        if (foo())
+            do
+                do
+                    alert(x);
+                while (--x);
+            while (x);
+        else
+            bar();
+    }
+    expect_exact: 'var x=3;if(foo()){do{do{alert(x)}while(--x)}while(x)}else{bar()}'
+}
+
+issue_186_beautify_bracketize: {
+    beautify = {
+        beautify: true,
+        bracketize: true,
+        screw_ie8: true,
+    }
+    input: {
+        var x = 3;
+        if (foo())
+            do
+                do
+                    alert(x);
+                while (--x);
+            while (x);
+        else
+            bar();
+    }
+    expect_exact: 'var x = 3;\n\nif (foo()) {\n    do {\n        do {\n            alert(x);\n        } while (--x);\n    } while (x);\n} else {\n    bar();\n}'
+}
+
+issue_186_beautify_bracketize_ie8: {
+    beautify = {
+        beautify: true,
+        bracketize: true,
+        screw_ie8: false,
+    }
+    input: {
+        var x = 3;
+        if (foo())
+            do
+                do
+                    alert(x);
+                while (--x);
+            while (x);
+        else
+            bar();
+    }
+    expect_exact: 'var x = 3;\n\nif (foo()) {\n    do {\n        do {\n            alert(x);\n        } while (--x);\n    } while (x);\n} else {\n    bar();\n}'
+}

test/compress/max_line_len.js

@@ -0,0 +1,28 @@
+too_short: {
+    beautify = {
+        max_line_len: 10,
+    }
+    input: {
+        function f(a) {
+            return { c: 42, d: a(), e: "foo"};
+        }
+    }
+    expect_exact: 'function f(a){\nreturn{\nc:42,\nd:a(),\ne:"foo"}}'
+    expect_warnings: [
+        "WARN: Output exceeds 10 characters"
+    ]
+}
+
+just_enough: {
+    beautify = {
+        max_line_len: 14,
+    }
+    input: {
+        function f(a) {
+            return { c: 42, d: a(), e: "foo"};
+        }
+    }
+    expect_exact: 'function f(a){\nreturn{c:42,\nd:a(),e:"foo"}\n}'
+    expect_warnings: [
+    ]
+}

test/compress/negate-iife.js

@@ -10,6 +10,16 @@ negate_iife_1: {
     }
 }
 
+negate_iife_1_off: {
+    options = {
+        negate_iife: false,
+    };
+    input: {
+        (function(){ stuff() })();
+    }
+    expect_exact: '(function(){stuff()})();'
+}
+
 negate_iife_2: {
     options = {
         negate_iife: true
@@ -22,44 +32,149 @@ negate_iife_2: {
     }
 }
 
-negate_iife_3: {
+negate_iife_2_side_effects: {
     options = {
         negate_iife: true,
-    };
+        side_effects: true,
+    }
     input: {
-        (function(){ return true })() ? console.log(true) : console.log(false);
+        (function(){ return {} })().x = 10; // should not transform this one
     }
     expect: {
-        !function(){ return true }() ? console.log(false) : console.log(true);
+        (function(){ return {} })().x = 10;
     }
 }
 
 negate_iife_3: {
     options = {
         negate_iife: true,
-        sequences: true
+        conditionals: true
     };
     input: {
-        (function(){ return true })() ? console.log(true) : console.log(false);
-        (function(){
-            console.log("something");
-        })();
+        (function(){ return t })() ? console.log(true) : console.log(false);
     }
     expect: {
-        !function(){ return true }() ? console.log(false) : console.log(true), function(){
-            console.log("something");
-        }();
+        !function(){ return t }() ? console.log(false) : console.log(true);
+    }
+}
+
+negate_iife_3_evaluate: {
+    options = {
+        conditionals: true,
+        evaluate: true,
+        negate_iife: true,
+    }
+    input: {
+        (function(){ return true })() ? console.log(true) : console.log(false);
+    }
+    expect: {
+        console.log(true);
+    }
+}
+
+negate_iife_3_side_effects: {
+    options = {
+        conditionals: true,
+        negate_iife: true,
+        side_effects: true,
+    }
+    input: {
+        (function(){ return t })() ? console.log(true) : console.log(false);
+    }
+    expect: {
+        !function(){ return t }() ? console.log(false) : console.log(true);
+    }
+}
+
+negate_iife_3_off: {
+    options = {
+        negate_iife: false,
+        conditionals: true,
+    };
+    input: {
+        (function(){ return t })() ? console.log(true) : console.log(false);
+    }
+    expect: {
+        !function(){ return t }() ? console.log(false) : console.log(true);
+    }
+}
+
+negate_iife_3_off_evaluate: {
+    options = {
+        conditionals: true,
+        evaluate: true,
+        negate_iife: false,
+    }
+    input: {
+        (function(){ return true })() ? console.log(true) : console.log(false);
+    }
+    expect: {
+        console.log(true);
     }
 }
 
 negate_iife_4: {
+    options = {
+        negate_iife: true,
+        conditionals: true,
+        sequences: true
+    };
+    input: {
+        (function(){ return t })() ? console.log(true) : console.log(false);
+        (function(){
+            console.log("something");
+        })();
+    }
+    expect: {
+        !function(){ return t }() ? console.log(false) : console.log(true), function(){
+            console.log("something");
+        }();
+    }
+}
+
+sequence_off: {
+    options = {
+        negate_iife: false,
+        conditionals: true,
+        sequences: true,
+        passes: 2,
+    };
+    input: {
+        function f() {
+            (function(){ return t })() ? console.log(true) : console.log(false);
+            (function(){
+                console.log("something");
+            })();
+        }
+        function g() {
+            (function(){
+                console.log("something");
+            })();
+            (function(){ return t })() ? console.log(true) : console.log(false);
+        }
+    }
+    expect: {
+        function f() {
+            !function(){ return t }() ? console.log(false) : console.log(true), function(){
+                console.log("something");
+            }();
+        }
+        function g() {
+            (function(){
+                console.log("something");
+            })(), function(){ return t }() ? console.log(true) : console.log(false);
+        }
+    }
+}
+
+negate_iife_5: {
     options = {
         negate_iife: true,
         sequences: true,
         conditionals: true,
     };
     input: {
-        if ((function(){ return true })()) {
+        if ((function(){ return t })()) {
             foo(true);
         } else {
             bar(false);
@@ -69,7 +184,30 @@ negate_iife_4: {
         })();
     }
     expect: {
-        !function(){ return true }() ? bar(false) : foo(true), function(){
+        !function(){ return t }() ? bar(false) : foo(true), function(){
+            console.log("something");
+        }();
+    }
+}
+
+negate_iife_5_off: {
+    options = {
+        negate_iife: false,
+        sequences: true,
+        conditionals: true,
+    };
+    input: {
+        if ((function(){ return t })()) {
+            foo(true);
+        } else {
+            bar(false);
+        }
+        (function(){
+            console.log("something");
+        })();
+    }
+    expect: {
+        !function(){ return t }() ? bar(false) : foo(true), function(){
             console.log("something");
         }();
     }
@@ -107,6 +245,38 @@ negate_iife_nested: {
     }
 }
 
+negate_iife_nested_off: {
+    options = {
+        negate_iife: false,
+        sequences: true,
+        conditionals: true,
+    };
+    input: {
+        function Foo(f) {
+            this.f = f;
+        }
+        new Foo(function() {
+            (function(x) {
+                (function(y) {
+                    console.log(y);
+                })(x);
+            })(7);
+        }).f();
+    }
+    expect: {
+        function Foo(f) {
+            this.f = f;
+        }
+        new Foo(function() {
+            (function(x) {
+                (function(y) {
+                    console.log(y);
+                })(x);
+            })(7);
+        }).f();
+    }
+}
+
 negate_iife_issue_1073: {
     options = {
         negate_iife: true,
@@ -172,3 +342,68 @@ issue_1254_negate_iife_nested: {
     }
     expect_exact: '!function(){return function(){console.log("test")}}()()()()();'
 }
+
+issue_1288: {
+    options = {
+        negate_iife: true,
+        conditionals: true,
+    };
+    input: {
+        if (w) ;
+        else {
+            (function f() {})();
+        }
+        if (!x) {
+            (function() {
+                x = {};
+            })();
+        }
+        if (y)
+            (function() {})();
+        else
+            (function(z) {
+                return z;
+            })(0);
+    }
+    expect: {
+        w || function f() {}();
+        x || function() {
+            x = {};
+        }();
+        y ? function() {}() : function(z) {
+            return z;
+        }(0);
+    }
+}
+
+issue_1288_side_effects: {
+    options = {
+        conditionals: true,
+        negate_iife: true,
+        side_effects: true,
+    }
+    input: {
+        if (w) ;
+        else {
+            (function f() {})();
+        }
+        if (!x) {
+            (function() {
+                x = {};
+            })();
+        }
+        if (y)
+            (function() {})();
+        else
+            (function(z) {
+                return z;
+            })(0);
+    }
+    expect: {
+        w;
+        x || function() {
+            x = {};
+        }();
+        y;
+    }
+}

test/compress/new.js

@@ -82,3 +82,19 @@ new_with_unary_prefix: {
     }
     expect_exact: 'var bar=(+new Date).toString(32);';
 }
+
+new_with_assignement_expression: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        var a;
+        new x(a = 5 * 2, b = [1, 2, 3], c = {a: "a", b: "b", cd: "c" + "d"});
+        new y([a, b] = [3, 4]);
+    }
+    expect: {
+        var a;
+        new x(a = 10, b = [1, 2, 3], c = {a: "a", b: "b", cd: "cd"});
+        new y([a, b] = [3, 4]);
+    }
+}

test/compress/numbers.js

@@ -17,3 +17,139 @@ hex_numbers_in_parentheses_for_prototype_functions: {
     }
     expect_exact: "-2;(-2).toFixed(0);2;2..toFixed(0);.2;.2.toFixed(0);2e-8;2e-8.toFixed(0);0xde0b6b3a7640080;(0xde0b6b3a7640080).toFixed(0);"
 }
+
+comparisons: {
+    options = {
+        comparisons: true,
+    }
+    input: {
+        console.log(
+            ~x === 42,
+            x % n === 42
+        );
+    }
+    expect: {
+        console.log(
+            42 == ~x,
+            x % n == 42
+        );
+    }
+}
+
+evaluate_1: {
+    options = {
+        evaluate: true,
+        unsafe_math: false,
+    }
+    input: {
+        console.log(
+            x + 1 + 2,
+            x * 1 * 2,
+            +x + 1 + 2,
+            1 + x + 2 + 3,
+            1 | x | 2 | 3,
+            1 + x-- + 2 + 3,
+            1 + (x*y + 2) + 3,
+            1 + (2 + x + 3),
+            1 + (2 + ~x + 3),
+            -y + (2 + ~x + 3),
+            1 & (2 & x & 3),
+            1 + (2 + (x |= 0) + 3)
+        );
+    }
+    expect: {
+        console.log(
+            x + 1 + 2,
+            1 * x * 2,
+            +x + 1 + 2,
+            1 + x + 2 + 3,
+            3 | x,
+            1 + x-- + 2 + 3,
+            x*y + 2 + 1 + 3,
+            1 + (2 + x + 3),
+            2 + ~x + 3 + 1,
+            -y + (2 + ~x + 3),
+            0 & x,
+            2 + (x |= 0) + 3 + 1
+        );
+    }
+}
+
+evaluate_2: {
+    options = {
+        evaluate: true,
+        unsafe_math: true,
+    }
+    input: {
+        console.log(
+            x + 1 + 2,
+            x * 1 * 2,
+            +x + 1 + 2,
+            1 + x + 2 + 3,
+            1 | x | 2 | 3,
+            1 + x-- + 2 + 3,
+            1 + (x*y + 2) + 3,
+            1 + (2 + x + 3),
+            1 & (2 & x & 3),
+            1 + (2 + (x |= 0) + 3)
+        );
+    }
+    expect: {
+        console.log(
+            x + 1 + 2,
+            2 * x,
+            3 + +x,
+            1 + x + 2 + 3,
+            3 | x,
+            6 + x--,
+            6 + x*y,
+            1 + (2 + x + 3),
+            0 & x,
+            6 + (x |= 0)
+        );
+    }
+}
+
+evaluate_3: {
+    options = {
+        evaluate: true,
+        unsafe: true,
+        unsafe_math: true,
+    }
+    input: {
+        console.log(1 + Number(x) + 2);
+    }
+    expect: {
+        console.log(3 + +x);
+    }
+}
+
+evaluate_4: {
+    options = {
+        evaluate: true,
+    }
+    input: {
+        console.log(
+            1+ +a,
+            +a+1,
+            1+-a,
+            -a+1,
+            +a+ +b,
+            +a+-b,
+            -a+ +b,
+            -a+-b
+        );
+    }
+    expect: {
+        console.log(
+            +a+1,
+            +a+1,
+            1-a,
+            1-a,
+            +a+ +b,
+            +a-b,
+            -a+ +b,
+            -a-b
+        );
+    }
+}

test/compress/object.js

@@ -170,6 +170,9 @@ shorthand_properties: {
 }
 
 concise_methods: {
+    beautify = {
+        ecma: 6
+    }
     input: {
         x = {
             foo(a, b) {
@@ -299,6 +302,9 @@ concise_methods_and_mangle_props: {
 }
 
 concise_generators: {
+    beautify = {
+        ecma: 6
+    }
     input: {
         x = {
             *foo(a, b) {

test/compress/parameters.js

@@ -119,6 +119,9 @@ destructuring_arguments_2: {
 }
 
 destructuring_arguments_3: {
+    beautify = {
+        ecma: 6
+    }
     input: {
         function fn3({x: {y: {z: {} = 42}}}) {}
         const { cover = (function () {}), xCover = (0, function() {})  } = {};
@@ -129,6 +132,9 @@ destructuring_arguments_3: {
 }
 
 default_arguments: {
+    beautify = {
+        ecma: 6
+    }
     input: {
         function x(a = 6) { }
         function x(a = (6 + 5)) { }
@@ -138,6 +144,9 @@ default_arguments: {
 }
 
 default_values_in_destructurings: {
+    beautify = {
+        ecma: 6
+    }
     input: {
         function x({a=(4), b}) {}
         function x([b, c=(12)]) {}

test/compress/properties.js

@@ -54,7 +54,56 @@ dot_properties_es5: {
     }
 }
 
-evaluate_length: {
+sub_properties: {
+    options = {
+        evaluate: true,
+        properties: true
+    };
+    input: {
+        a[0] = 0;
+        a["0"] = 1;
+        a[3.14] = 2;
+        a["3" + ".14"] = 3;
+        a["i" + "f"] = 4;
+        a["foo" + " bar"] = 5;
+        a[0 / 0] = 6;
+        a[null] = 7;
+        a[undefined] = 8;
+    }
+    expect: {
+        a[0] = 0;
+        a[0] = 1;
+        a[3.14] = 2;
+        a[3.14] = 3;
+        a.if = 4;
+        a["foo bar"] = 5;
+        a[NaN] = 6;
+        a[null] = 7;
+        a[void 0] = 8;
+    }
+}
+
+evaluate_array_length: {
+    options = {
+        properties: true,
+        unsafe: true,
+        evaluate: true
+    };
+    input: {
+        a = [1, 2, 3].length;
+        a = [1, 2, 3].join()["len" + "gth"];
+        a = [1, 2, b].length;
+        a = [1, 2, 3].join(b).length;
+    }
+    expect: {
+        a = 3;
+        a = 5;
+        a = [1, 2, b].length;
+        a = [1, 2, 3].join(b).length;
+    }
+}
+
+evaluate_string_length: {
     options = {
         properties: true,
         unsafe: true,
@@ -491,3 +540,19 @@ first_256_hex_chars_as_properties: {
         };
     }
 }
+
+native_prototype: {
+    options = {
+        unsafe_proto: true,
+    }
+    input: {
+        Array.prototype.splice.apply(a, [1, 2, b, c]);
+        Object.prototype.hasOwnProperty.call(d, "foo");
+        String.prototype.indexOf.call(e, "bar");
+    }
+    expect: {
+        [].splice.apply(a, [1, 2, b, c]);
+        ({}).hasOwnProperty.call(d, "foo");
+        "".indexOf.call(e, "bar");
+    }
+}

test/compress/pure_funcs.js

@@ -0,0 +1,295 @@
+array: {
+    options = {
+        pure_funcs: [ "Math.floor" ],
+        side_effects: true,
+    }
+    input: {
+        var a;
+        function f(b) {
+            Math.floor(a / b);
+            Math.floor(c / b);
+        }
+    }
+    expect: {
+        var a;
+        function f(b) {
+            c;
+        }
+    }
+}
+
+func: {
+    options = {
+        pure_funcs: function(node) {
+            return !~node.args[0].print_to_string().indexOf("a");
+        },
+        side_effects: true,
+    }
+    input: {
+        function f(a, b) {
+            Math.floor(a / b);
+            Math.floor(c / b);
+        }
+    }
+    expect: {
+        function f(a, b) {
+            Math.floor(c / b);
+        }
+    }
+}
+
+side_effects: {
+    options = {
+        pure_funcs: [ "console.log" ],
+        side_effects: true,
+    }
+    input: {
+        function f(a, b) {
+            console.log(a());
+            console.log(b);
+        }
+    }
+    expect: {
+        function f(a, b) {
+            a();
+        }
+    }
+}
+
+unused: {
+    options = {
+        pure_funcs: [ "pure" ],
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        function foo() {
+            var u = pure(1);
+            var x = pure(2);
+            var y = pure(x);
+            var z = pure(pure(side_effects()));
+            return pure(3);
+        }
+    }
+    expect: {
+        function foo() {
+            side_effects();
+            return pure(3);
+        }
+    }
+}
+
+babel: {
+    options = {
+        pure_funcs: [ "_classCallCheck" ],
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        function _classCallCheck(instance, Constructor) {
+            if (!(instance instanceof Constructor))
+                throw new TypeError("Cannot call a class as a function");
+        }
+        var Foo = function Foo() {
+            _classCallCheck(this, Foo);
+        };
+    }
+    expect: {
+        function _classCallCheck(instance, Constructor) {
+            if (!(instance instanceof Constructor))
+                throw new TypeError("Cannot call a class as a function");
+        }
+        var Foo = function() {
+        };
+    }
+}
+
+conditional: {
+    options = {
+        pure_funcs: [ "pure" ],
+        side_effects: true,
+    }
+    input: {
+        pure(1 | a() ? 2 & b() : 7 ^ c());
+        pure(1 | a() ? 2 & b() : 5);
+        pure(1 | a() ? 4 : 7 ^ c());
+        pure(1 | a() ? 4 : 5);
+        pure(3 ? 2 & b() : 7 ^ c());
+        pure(3 ? 2 & b() : 5);
+        pure(3 ? 4 : 7 ^ c());
+        pure(3 ? 4 : 5);
+    }
+    expect: {
+        1 | a() ? b() : c();
+        1 | a() && b();
+        1 | a() || c();
+        a();
+        3 ? b() : c();
+        3 && b();
+        3 || c();
+    }
+}
+
+relational: {
+    options = {
+        pure_funcs: [ "foo" ],
+        side_effects :true,
+    }
+    input: {
+        foo() in foo();
+        foo() instanceof bar();
+        foo() < "bar";
+        bar() > foo();
+        bar() != bar();
+        bar() !== "bar";
+        "bar" == foo();
+        "bar" === bar();
+        "bar" >= "bar";
+    }
+    expect: {
+        bar();
+        bar();
+        bar(), bar();
+        bar();
+        bar();
+    }
+}
+
+arithmetic: {
+    options = {
+        pure_funcs: [ "foo" ],
+        side_effects :true,
+    }
+    input: {
+        foo() + foo();
+        foo() - bar();
+        foo() * "bar";
+        bar() / foo();
+        bar() & bar();
+        bar() | "bar";
+        "bar" >> foo();
+        "bar" << bar();
+        "bar" >>> "bar";
+    }
+    expect: {
+        bar();
+        bar();
+        bar(), bar();
+        bar();
+        bar();
+    }
+}
+
+boolean_and: {
+    options = {
+        pure_funcs: [ "foo" ],
+        side_effects :true,
+    }
+    input: {
+        foo() && foo();
+        foo() && bar();
+        foo() && "bar";
+        bar() && foo();
+        bar() && bar();
+        bar() && "bar";
+        "bar" && foo();
+        "bar" && bar();
+        "bar" && "bar";
+    }
+    expect: {
+        foo() && bar();
+        bar();
+        bar() && bar();
+        bar();
+        "bar" && bar();
+    }
+}
+
+boolean_or: {
+    options = {
+        pure_funcs: [ "foo" ],
+        side_effects :true,
+    }
+    input: {
+        foo() || foo();
+        foo() || bar();
+        foo() || "bar";
+        bar() || foo();
+        bar() || bar();
+        bar() || "bar";
+        "bar" || foo();
+        "bar" || bar();
+        "bar" || "bar";
+    }
+    expect: {
+        foo() || bar();
+        bar();
+        bar() || bar();
+        bar();
+        "bar" || bar();
+    }
+}
+
+assign: {
+    options = {
+        pure_funcs: [ "foo" ],
+        side_effects :true,
+    }
+    input: {
+        var a;
+        function f(b) {
+            a = foo();
+            b *= 4 + foo();
+            c >>= 0 | foo();
+        }
+    }
+    expect: {
+        var a;
+        function f(b) {
+            a = foo();
+            b *= 4 + foo();
+            c >>= 0 | foo();
+        }
+    }
+}
+
+unary: {
+    options = {
+        pure_funcs: [ "foo" ],
+        side_effects :true,
+    }
+    input: {
+        typeof foo();
+        typeof bar();
+        typeof "bar";
+        void foo();
+        void bar();
+        void "bar";
+        delete a[foo()];
+        delete a[bar()];
+        delete a["bar"];
+        a[foo()]++;
+        a[bar()]++;
+        a["bar"]++;
+        --a[foo()];
+        --a[bar()];
+        --a["bar"];
+        ~foo();
+        ~bar();
+        ~"bar";
+    }
+    expect: {
+        bar();
+        bar();
+        delete a[foo()];
+        delete a[bar()];
+        delete a["bar"];
+        a[foo()]++;
+        a[bar()]++;
+        a["bar"]++;
+        --a[foo()];
+        --a[bar()];
+        --a["bar"];
+        bar();
+    }
+}

test/compress/screw-ie8.js

@@ -17,6 +17,26 @@ dont_screw: {
     expect_exact: 'f("\\x0B");';
 }
 
+do_screw_constants: {
+    options = {
+        screw_ie8: true,
+    }
+    input: {
+        f(undefined, Infinity);
+    }
+    expect_exact: "f(void 0,1/0);"
+}
+
+dont_screw_constants: {
+    options = {
+        screw_ie8: false,
+    }
+    input: {
+        f(undefined, Infinity);
+    }
+    expect_exact: "f(undefined,Infinity);"
+}
+
 do_screw_try_catch: {
     options = { screw_ie8: true };
     mangle = { screw_ie8: true };
@@ -62,11 +82,11 @@ dont_screw_try_catch: {
     }
     expect: {
         bad = function(n){
-            return function(n){
+            return function(t){
                 try{
-                    t()
-                } catch(t) {
-                    n(t)
+                    n()
+                } catch(n) {
+                    t(n)
                 }
             }
         };
@@ -117,14 +137,84 @@ dont_screw_try_catch_undefined: {
         };
     }
     expect: {
-        function a(o){
+        function a(n){
             try{
                 throw "Stuff"
-            } catch (n) {
-                console.log("caught: "+n)
+            } catch (undefined) {
+                console.log("caught: " + undefined)
             }
-            console.log("undefined is " + void 0);
-            return void 0===o
+            console.log("undefined is " + undefined);
+            return n === undefined
         }
     }
 }
+
+reduce_vars: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        screw_ie8: false,
+        unused: true,
+    }
+    mangle = {
+        screw_ie8: false,
+    }
+    input: {
+        function f() {
+            var a;
+            try {
+                x();
+            } catch (a) {
+                y();
+            }
+            alert(a);
+        }
+    }
+    expect: {
+        function f() {
+            var t;
+            try {
+                x();
+            } catch (t) {
+                y();
+            }
+            alert(t);
+        }
+    }
+}
+
+issue_1586_1: {
+    options = {
+        screw_ie8: false,
+    }
+    mangle = {
+        screw_ie8: false,
+    }
+    input: {
+        function f() {
+            try {
+            } catch (err) {
+                console.log(err.message);
+            }
+        }
+    }
+    expect_exact: "function f(){try{}catch(c){console.log(c.message)}}"
+}
+
+issue_1586_2: {
+    options = {
+        screw_ie8: true,
+    }
+    mangle = {
+        screw_ie8: true,
+    }
+    input: {
+        function f() {
+            try {
+            } catch (err) {
+                console.log(err.message);
+            }
+        }
+    }
+    expect_exact: "function f(){try{}catch(c){console.log(c.message)}}"
+}

test/compress/sequences.js

@@ -169,3 +169,118 @@ for_sequences: {
         for (y = 5; false;);
     }
 }
+
+limit_1: {
+    options = {
+        sequences: 3,
+    };
+    input: {
+        a;
+        b;
+        c;
+        d;
+        e;
+        f;
+        g;
+        h;
+        i;
+        j;
+        k;
+    }
+    expect: {
+        a, b, c;
+        d, e, f;
+        g, h, i;
+        j, k;
+    }
+}
+
+limit_2: {
+    options = {
+        sequences: 3,
+    };
+    input: {
+        a, b;
+        c, d;
+        e, f;
+        g, h;
+        i, j;
+        k;
+    }
+    expect: {
+        a, b, c, d;
+        e, f, g, h;
+        i, j, k;
+    }
+}
+
+negate_iife_for: {
+    options = {
+        sequences: true,
+        negate_iife: true,
+    };
+    input: {
+        (function() {})();
+        for (i = 0; i < 5; i++) console.log(i);
+
+        (function() {})();
+        for (; i < 5; i++) console.log(i);
+    }
+    expect: {
+        for (!function() {}(), i = 0; i < 5; i++) console.log(i);
+        for (function() {}(); i < 5; i++) console.log(i);
+    }
+}
+
+iife: {
+    options = {
+        sequences: true,
+    };
+    input: {
+        x = 42;
+        (function a() {})();
+        !function b() {}();
+        ~function c() {}();
+        +function d() {}();
+        -function e() {}();
+        void function f() {}();
+        typeof function g() {}();
+    }
+    expect: {
+        x = 42, function a() {}(), function b() {}(), function c() {}(),
+        function d() {}(), function e() {}(), function f() {}(), function g() {}();
+    }
+}
+
+unsafe_undefined: {
+    options = {
+        conditionals: true,
+        if_return: true,
+        sequences: true,
+        side_effects: true,
+        unsafe: true,
+    }
+    input: {
+        function f(undefined) {
+            if (a)
+                return b;
+            if (c)
+                return d;
+        }
+        function g(undefined) {
+            if (a)
+                return b;
+            if (c)
+                return d;
+            e();
+        }
+    }
+    expect: {
+        function f(undefined) {
+            return a ? b : c ? d : undefined;
+        }
+        function g(undefined) {
+            return a ? b : c ? d : void e();
+        }
+    }
+}

test/compress/template-string.js

@@ -376,4 +376,4 @@ template_ending_with_newline: {
 `;
         };
     } expect_exact: "function foo(e){return`this is a template string!\n`}"
-}
+}

test/compress/try-catch.js

@@ -1,4 +1,7 @@
 catch_destructuring_with_sequence: {
+    beautify = {
+        ecma: 6
+    }
     input: {
         try {
             throw {};

test/compress/typeof.js

@@ -29,6 +29,7 @@ typeof_in_boolean_context: {
         booleans     : true,
         evaluate     : true,
         conditionals : true,
+        side_effects : true,
     };
     input: {
         function f1(x) { return typeof x ? "yes" : "no"; }
@@ -36,12 +37,14 @@ typeof_in_boolean_context: {
         typeof 0 ? foo() : bar();
         !typeof console.log(1);
         var a = !typeof console.log(2);
+        if (typeof (1 + foo()));
     }
     expect: {
         function f1(x) { return "yes"; }
         function f2() { return g(), "Yes"; }
         foo();
-        !(console.log(1), !0);
+        console.log(1);
         var a = !(console.log(2), !0);
+        foo();
     }
 }

test/compress/yield.js

@@ -163,4 +163,30 @@ empty_generator_as_parameter_without_side_effects: {
         evaluate(GeneratorPrototype);
     }
     expect_exact: "var GeneratorPrototype=Object.getPrototypeOf(Object.getPrototypeOf(function*(){}()));evaluate(GeneratorPrototype);"
-}
+}
+
+yield_dot: {
+    options = {
+    }
+    input: {
+        function* foo(){
+            yield x.foo;
+            (yield x).foo;
+            yield (yield obj.foo()).bar();
+        }
+    }
+    expect_exact: "function*foo(){yield x.foo;(yield x).foo;yield(yield obj.foo()).bar()}"
+}
+
+yield_sub: {
+    options = {
+    }
+    input: {
+        function* foo(){
+            yield x['foo'];
+            (yield x)['foo'];
+            yield (yield obj.foo())['bar']();
+        }
+    }
+    expect_exact: 'function*foo(){yield x["foo"];(yield x)["foo"];yield(yield obj.foo())["bar"]()}'
+}

test/input/global_defs/nested.js

@@ -0,0 +1 @@
+console.log(C.V, C.D);

test/input/global_defs/simple.js

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

test/input/invalid/eof.js

@@ -0,0 +1 @@
+foo, bar(

test/input/invalid/loop-no-body.js

@@ -0,0 +1 @@
+for (var i = 0; i < 1; i++) 

test/input/invalid/simple.js

@@ -0,0 +1 @@
+function f(a{}

test/input/invalid/tab.js

@@ -0,0 +1 @@
+		foo(	xyz, 0abc);

test/input/issue-1431/sample.js

@@ -0,0 +1,14 @@
+function f(x) {
+    return function() {
+        function n(a) {
+            return a * a;
+        }
+        return x(n);
+    };
+}
+
+function g(op) {
+    return op(1) + op(2);
+}
+
+console.log(f(g)() == 5);

test/input/issue-1482/bracketize.js

@@ -0,0 +1,73 @@
+if (x) {
+    foo();
+}
+
+if (x) {
+    foo();
+} else {
+    baz();
+}
+
+if (x) {
+    foo();
+} else if (y) {
+    bar();
+} else {
+    baz();
+}
+
+if (x) {
+    if (y) {
+        foo();
+    } else {
+        bar();
+    }
+} else {
+    baz();
+}
+
+if (x) {
+    foo();
+} else if (y) {
+    bar();
+} else if (z) {
+    baz();
+} else {
+    moo();
+}
+
+function f() {
+    if (x) {
+        foo();
+    }
+    if (x) {
+        foo();
+    } else {
+        baz();
+    }
+    if (x) {
+        foo();
+    } else if (y) {
+        bar();
+    } else {
+        baz();
+    }
+    if (x) {
+        if (y) {
+            foo();
+        } else {
+            bar();
+        }
+    } else {
+        baz();
+    }
+    if (x) {
+        foo();
+    } else if (y) {
+        bar();
+    } else if (z) {
+        baz();
+    } else {
+        moo();
+    }
+}

test/input/issue-1482/default.js

@@ -0,0 +1,17 @@
+if (x) foo();
+
+if (x) foo(); else baz();
+
+if (x) foo(); else if (y) bar(); else baz();
+
+if (x) if (y) foo(); else bar(); else baz();
+
+if (x) foo(); else if (y) bar(); else if (z) baz(); else moo();
+
+function f() {
+    if (x) foo();
+    if (x) foo(); else baz();
+    if (x) foo(); else if (y) bar(); else baz();
+    if (x) if (y) foo(); else bar(); else baz();
+    if (x) foo(); else if (y) bar(); else if (z) baz(); else moo();
+}

test/input/issue-1482/input.js

@@ -0,0 +1,12 @@
+if (x) foo();
+if (x) foo(); else baz();
+if (x) foo(); else if (y) bar(); else baz();
+if (x) if (y) foo(); else bar(); else baz();
+if (x) foo(); else if (y) bar(); else if (z) baz(); else moo();
+function f() {
+if (x) foo();
+if (x) foo(); else baz();
+if (x) foo(); else if (y) bar(); else baz();
+if (x) if (y) foo(); else bar(); else baz();
+if (x) foo(); else if (y) bar(); else if (z) baz(); else moo();
+}

test/input/issue-520/input.js

@@ -0,0 +1,3 @@
+var Foo = function Foo(){console.log(1+2);}; new Foo();
+
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJmaWxlIjpudWxsLCJzb3VyY2VzIjpbInN0ZGluIl0sInNvdXJjZXNDb250ZW50IjpbImNsYXNzIEZvbyB7IGNvbnN0cnVjdG9yKCl7Y29uc29sZS5sb2coMSsyKTt9IH0gbmV3IEZvbygpO1xuIl0sIm5hbWVzIjpbXSwibWFwcGluZ3MiOiJBQUFBLElBQU0sR0FBRyxHQUFDLEFBQUUsWUFBVyxFQUFFLENBQUMsT0FBTyxDQUFDLEdBQUcsQ0FBQyxDQUFDLENBQUMsQ0FBQyxDQUFDLENBQUMsQ0FBQyxDQUFBLEFBQUUsQ0FBQyxJQUFJLEdBQUcsRUFBRSxDQUFDOyJ9

test/input/issue-520/output.js

@@ -0,0 +1,2 @@
+new function(){console.log(3)};
+//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInN0ZGluIl0sIm5hbWVzIjpbImNvbnNvbGUiLCJsb2ciXSwibWFwcGluZ3MiOiJBQUErQyxHQUFyQyxZQUFnQkEsUUFBUUMsSUFBSSIsInNvdXJjZXNDb250ZW50IjpbImNsYXNzIEZvbyB7IGNvbnN0cnVjdG9yKCl7Y29uc29sZS5sb2coMSsyKTt9IH0gbmV3IEZvbygpO1xuIl19

test/jetstream.js

@@ -0,0 +1,87 @@
+#! /usr/bin/env node
+// -*- js -*-
+
+"use strict";
+
+var site = "http://browserbench.org/JetStream/";
+if (typeof phantom == "undefined") {
+    // workaround for tty output truncation upon process.exit()
+    [process.stdout, process.stderr].forEach(function(stream){
+        if (stream._handle && stream._handle.setBlocking)
+            stream._handle.setBlocking(true);
+    });
+    var args = process.argv.slice(2);
+    if (!args.length) {
+        args.push("-mc", "warnings=false");
+    }
+    args.push("--stats");
+    var child_process = require("child_process");
+    try {
+        require("phantomjs-prebuilt");
+    } catch(e) {
+        child_process.execSync("npm install phantomjs-prebuilt@2.1.14");
+    }
+    var http = require("http");
+    var server = http.createServer(function(request, response) {
+        request.resume();
+        var url = decodeURIComponent(request.url.slice(1));
+        var stderr = "";
+        var uglifyjs = child_process.fork("bin/uglifyjs", args, {
+            silent: true
+        }).on("exit", function(code) {
+            console.log("uglifyjs", url.indexOf(site) == 0 ? url.slice(site.length) : url, args.join(" "));
+            console.log(stderr);
+            if (code) throw new Error("uglifyjs failed with code " + code);
+        });
+        uglifyjs.stderr.on("data", function(data) {
+            stderr += data;
+        }).setEncoding("utf8");
+        uglifyjs.stdout.pipe(response);
+        http.get(url, function(res) {
+            res.pipe(uglifyjs.stdin);
+        });
+    }).listen().on("listening", function() {
+        var phantomjs = require("phantomjs-prebuilt");
+        var program = phantomjs.exec(process.argv[1], server.address().port);
+        program.stdout.pipe(process.stdout);
+        program.stderr.pipe(process.stderr);
+        program.on("exit", function(code) {
+            server.close();
+            if (code) throw new Error("JetStream failed!");
+            console.log("JetStream completed successfully.");
+        });
+    });
+    server.timeout = 0;
+} else {
+    var page = require("webpage").create();
+    page.onError = function(msg, trace) {
+        var body = [ msg ];
+        if (trace) trace.forEach(function(t) {
+            body.push("  " + (t.function || "Anonymous function") + " (" + t.file + ":" + t.line + ")");
+        });
+        console.error(body.join("\n"));
+        phantom.exit(1);
+    };
+    var url = "http://localhost:" + require("system").args[1] + "/";
+    page.onResourceRequested = function(requestData, networkRequest) {
+        if (/\.js$/.test(requestData.url))
+            networkRequest.changeUrl(url + encodeURIComponent(requestData.url));
+    }
+    page.onConsoleMessage = function(msg) {
+        if (/Error:/i.test(msg)) {
+            console.error(msg);
+            phantom.exit(1);
+        }
+        console.log(msg);
+        if (~msg.indexOf("Raw results:")) {
+            phantom.exit();
+        }
+    };
+    page.open(site, function(status) {
+        if (status != "success") phantomjs.exit(1);
+        page.evaluate(function() {
+            JetStream.switchToQuick();
+            JetStream.start();
+        });
+    });
+}

test/mocha/accessorTokens-1492.js

@@ -0,0 +1,32 @@
+var UglifyJS = require('../../');
+var assert = require("assert");
+
+describe("Accessor tokens", function() {
+    it("Should fill the token information for accessors (issue #1492)", function() {
+        // location               0         1         2         3         4
+        //                        01234567890123456789012345678901234567890123456789
+        var ast = UglifyJS.parse("var obj = { get latest() { return undefined; } }");
+
+        // test all AST_ObjectProperty tokens are set as expected
+        var checkedAST_ObjectProperty = false;
+        var checkWalker = new UglifyJS.TreeWalker(function(node, descend) {
+            if (node instanceof UglifyJS.AST_ObjectProperty) {
+                checkedAST_ObjectProperty = true;
+
+                assert.equal(node.start.pos, 12);
+                assert.equal(node.end.endpos, 46);
+
+                assert(node.key instanceof UglifyJS.AST_SymbolMethod);
+                assert.equal(node.key.start.pos, 12);
+                assert.equal(node.key.end.endpos, 22);
+
+                assert(node.value instanceof UglifyJS.AST_Accessor);
+                assert.equal(node.value.start.pos, 22);
+                assert.equal(node.value.end.endpos, 46);
+
+            }
+        });
+        ast.walk(checkWalker);
+        assert(checkedAST_ObjectProperty, "AST_ObjectProperty not found");
+    });
+});

test/mocha/arguments.js

@@ -27,4 +27,253 @@ describe("arguments", function() {
         assert.strictEqual(ast.body[0].body[0].uses_arguments, true);
         assert.strictEqual(ast.body[0].body[0].body[0].uses_arguments, false);
     });
-});
+
+    it("Should parse a function containing default assignment correctly", function() {
+        var ast = UglifyJS.parse("function foo(a = 123) {}");
+        assert(ast.body[0] instanceof UglifyJS.AST_Defun);
+        assert.strictEqual(ast.body[0].argnames.length, 1);
+
+        // First argument
+        assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_DefaultAssign);
+        assert(ast.body[0].argnames[0].left instanceof UglifyJS.AST_SymbolFunarg);
+        assert.strictEqual(ast.body[0].argnames[0].operator, "=");
+        assert(ast.body[0].argnames[0].right instanceof UglifyJS.AST_Number);
+
+        ast = UglifyJS.parse("function foo(a = a) {}");
+        assert(ast.body[0] instanceof UglifyJS.AST_Defun);
+        assert.strictEqual(ast.body[0].argnames.length, 1);
+
+        // First argument
+        assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_DefaultAssign);
+        assert(ast.body[0].argnames[0].left instanceof UglifyJS.AST_SymbolFunarg);
+        assert.strictEqual(ast.body[0].argnames[0].operator, "=");
+        assert(ast.body[0].argnames[0].right instanceof UglifyJS.AST_SymbolRef);
+    });
+
+    it("Should parse a function containing default assignments in destructuring correctly", function() {
+        var ast = UglifyJS.parse("function foo([a = 123]) {}");
+        assert(ast.body[0] instanceof UglifyJS.AST_Defun);
+        assert.strictEqual(ast.body[0].argnames.length, 1);
+
+        // First argument
+        assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
+        assert.strictEqual(ast.body[0].argnames[0].is_array, true);
+        assert.strictEqual(ast.body[0].argnames[0].names.length, 1);
+        assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_DefaultAssign);
+        assert(ast.body[0].argnames[0].names[0].left instanceof UglifyJS.AST_SymbolFunarg);
+        assert.strictEqual(ast.body[0].argnames[0].names[0].operator, "=");
+        assert(ast.body[0].argnames[0].names[0].right instanceof UglifyJS.AST_Number);
+
+
+        ast = UglifyJS.parse("function foo({a = 123}) {}");
+        assert(ast.body[0] instanceof UglifyJS.AST_Defun);
+        assert.strictEqual(ast.body[0].argnames.length, 1);
+
+        // First argument
+        assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
+        assert.strictEqual(ast.body[0].argnames[0].is_array, false);
+        assert.strictEqual(ast.body[0].argnames[0].names.length, 1);
+        assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_ObjectKeyVal);
+        assert.strictEqual(ast.body[0].argnames[0].names[0].key, "a");
+
+        // Property a of first argument
+        assert(ast.body[0].argnames[0].names[0].value instanceof UglifyJS.AST_DefaultAssign);
+        assert(ast.body[0].argnames[0].names[0].value.left instanceof UglifyJS.AST_SymbolFunarg);
+        assert.strictEqual(ast.body[0].argnames[0].names[0].value.operator, "=");
+        assert(ast.body[0].argnames[0].names[0].value.right instanceof UglifyJS.AST_Number);
+
+
+        ast = UglifyJS.parse("function foo({a: a = 123}) {}");
+        assert(ast.body[0] instanceof UglifyJS.AST_Defun);
+        assert.strictEqual(ast.body[0].argnames.length, 1);
+
+        // First argument
+        assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
+        assert.strictEqual(ast.body[0].argnames[0].is_array, false);
+        assert.strictEqual(ast.body[0].argnames[0].names.length, 1);
+
+        // Content destructuring of first argument
+        assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_ObjectKeyVal);
+        assert.strictEqual(ast.body[0].argnames[0].names[0].key, "a");
+        assert(ast.body[0].argnames[0].names[0].value instanceof UglifyJS.AST_DefaultAssign);
+
+        // Property a of first argument
+        assert(ast.body[0].argnames[0].names[0].value instanceof UglifyJS.AST_DefaultAssign);
+        assert(ast.body[0].argnames[0].names[0].value.left instanceof UglifyJS.AST_SymbolFunarg);
+        assert.strictEqual(ast.body[0].argnames[0].names[0].value.operator, "=");
+        assert(ast.body[0].argnames[0].names[0].value.right instanceof UglifyJS.AST_Number);
+    });
+
+    it("Should parse a function containing default assignments in complex destructuring correctly", function() {
+        var ast = UglifyJS.parse("function foo([a, [b = 123]]){}");
+        assert(ast.body[0] instanceof UglifyJS.AST_Defun);
+        assert.strictEqual(ast.body[0].argnames.length, 1);
+
+        // Check first argument
+        assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
+        assert.strictEqual(ast.body[0].argnames[0].is_array, true);
+        assert.strictEqual(ast.body[0].argnames[0].names.length, 2);
+
+        // Check whole destructuring structure of first argument
+        assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_SymbolFunarg);
+        assert(ast.body[0].argnames[0].names[1] instanceof UglifyJS.AST_Destructuring);
+        assert.strictEqual(ast.body[0].argnames[0].names[1].is_array, true);
+
+        // Check content of second destructuring element (which is the nested destructuring pattern)
+        assert(ast.body[0].argnames[0].names[1].names[0] instanceof UglifyJS.AST_DefaultAssign);
+        assert(ast.body[0].argnames[0].names[1].names[0].left instanceof UglifyJS.AST_SymbolFunarg);
+        assert.strictEqual(ast.body[0].argnames[0].names[1].names[0].operator, "=");
+        assert(ast.body[0].argnames[0].names[1].names[0].right instanceof UglifyJS.AST_Number);
+
+
+        ast = UglifyJS.parse("function foo([a, {b: c = 123}]){}");
+        assert(ast.body[0] instanceof UglifyJS.AST_Defun);
+        assert.strictEqual(ast.body[0].argnames.length, 1);
+
+        // Check first argument
+        assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
+        assert.strictEqual(ast.body[0].argnames[0].is_array, true);
+        assert.strictEqual(ast.body[0].argnames[0].names.length, 2);
+
+        // Check whole destructuring structure of first argument
+        assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_SymbolFunarg);
+        assert(ast.body[0].argnames[0].names[1] instanceof UglifyJS.AST_Destructuring);
+        assert.strictEqual(ast.body[0].argnames[0].names[1].is_array, false);
+
+        // Check content of second destructuring element (which is the nested destructuring pattern)
+        assert(ast.body[0].argnames[0].names[1].names[0] instanceof UglifyJS.AST_ObjectKeyVal);
+        assert.strictEqual(ast.body[0].argnames[0].names[1].names[0].key, "b");
+        assert(ast.body[0].argnames[0].names[1].names[0].value instanceof UglifyJS.AST_DefaultAssign);
+
+        // Property b of second argument
+        assert(ast.body[0].argnames[0].names[1].names[0].value instanceof UglifyJS.AST_DefaultAssign);
+        assert(ast.body[0].argnames[0].names[1].names[0].value.left instanceof UglifyJS.AST_SymbolFunarg);
+        assert.strictEqual(ast.body[0].argnames[0].names[1].names[0].value.operator, "=");
+        assert(ast.body[0].argnames[0].names[1].names[0].value.right instanceof UglifyJS.AST_Number);
+
+
+        ast = UglifyJS.parse("function foo({a, b: {b = 123}}){}");
+        assert(ast.body[0] instanceof UglifyJS.AST_Defun);
+        assert.strictEqual(ast.body[0].argnames.length, 1);
+
+        // Check first argument
+        assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
+        assert.strictEqual(ast.body[0].argnames[0].is_array, false);
+        assert.strictEqual(ast.body[0].argnames[0].names.length, 2);
+
+        // Check whole destructuring structure of first argument
+        assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_ObjectKeyVal);
+        assert.strictEqual(ast.body[0].argnames[0].names[0].key, "a");
+        assert(ast.body[0].argnames[0].names[0].value instanceof UglifyJS.AST_SymbolFunarg);
+        assert(ast.body[0].argnames[0].names[1] instanceof UglifyJS.AST_ObjectKeyVal);
+        assert.strictEqual(ast.body[0].argnames[0].names[1].key, "b");
+        assert(ast.body[0].argnames[0].names[1].value instanceof UglifyJS.AST_Destructuring);
+
+        // Check content of nested destructuring in first parameter
+        var content = ast.body[0].argnames[0].names[1].value
+        assert.strictEqual(content.is_array, false);
+        assert.strictEqual(content.names.length, 1);
+        assert(content.names[0] instanceof UglifyJS.AST_ObjectKeyVal);
+        assert.strictEqual(content.names[0].key, "b");
+        assert(content.names[0].value instanceof UglifyJS.AST_DefaultAssign);
+        assert(content.names[0].value.left instanceof UglifyJS.AST_SymbolFunarg);
+        assert.strictEqual(content.names[0].value.operator, "=");
+        assert(content.names[0].value.right instanceof UglifyJS.AST_Number);
+
+
+        ast = UglifyJS.parse("function foo({a: {b = 123}}){}");
+        assert(ast.body[0] instanceof UglifyJS.AST_Defun);
+        assert.strictEqual(ast.body[0].argnames.length, 1);
+
+        // Check first argument
+        assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
+        assert.strictEqual(ast.body[0].argnames[0].is_array, false);
+        assert.strictEqual(ast.body[0].argnames[0].names.length, 1);
+
+        // Check whole destructuring structure of first argument
+        assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_ObjectKeyVal);
+        assert.strictEqual(ast.body[0].argnames[0].names[0].key, "a");
+        assert(ast.body[0].argnames[0].names[0].value instanceof UglifyJS.AST_Destructuring);
+
+        // Check content of nested destructuring
+        content = ast.body[0].argnames[0].names[0].value
+        assert.strictEqual(content.is_array, false);
+        assert.strictEqual(content.names.length, 1);
+        assert(content.names[0] instanceof UglifyJS.AST_ObjectKeyVal);
+        assert.strictEqual(content.names[0].key, "b");
+        assert(content.names[0].value instanceof UglifyJS.AST_DefaultAssign);
+        assert(content.names[0].value.left instanceof UglifyJS.AST_SymbolFunarg);
+        assert.strictEqual(content.names[0].value.operator, "=");
+        assert(content.names[0].value.right instanceof UglifyJS.AST_Number);
+    });
+
+    it("Should parse spread correctly", function() {
+        var ast = UglifyJS.parse("function foo(a, b, ...c){}");
+        assert(ast.body[0] instanceof UglifyJS.AST_Defun);
+        assert.strictEqual(ast.body[0].argnames.length, 3);
+
+        // Check parameters
+        assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_SymbolFunarg);
+        assert(ast.body[0].argnames[1] instanceof UglifyJS.AST_SymbolFunarg);
+        assert(ast.body[0].argnames[2] instanceof UglifyJS.AST_Expansion);
+        assert(ast.body[0].argnames[2].expression instanceof UglifyJS.AST_SymbolFunarg);
+
+
+        ast = UglifyJS.parse("function foo([a, b, ...c]){}");
+        assert(ast.body[0] instanceof UglifyJS.AST_Defun);
+        assert.strictEqual(ast.body[0].argnames.length, 1);
+
+        // Check first parameter
+        assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
+        assert.strictEqual(ast.body[0].argnames[0].is_array, true);
+
+        // Check content first parameter
+        assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_SymbolFunarg);
+        assert(ast.body[0].argnames[0].names[1] instanceof UglifyJS.AST_SymbolFunarg);
+        assert(ast.body[0].argnames[0].names[2] instanceof UglifyJS.AST_Expansion);
+        assert(ast.body[0].argnames[0].names[2].expression instanceof UglifyJS.AST_SymbolFunarg);
+
+
+        ast = UglifyJS.parse("function foo([a, b, [c, ...d]]){}");
+        assert(ast.body[0] instanceof UglifyJS.AST_Defun);
+        assert.strictEqual(ast.body[0].argnames.length, 1);
+
+        // Check first parameter
+        assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
+        assert.strictEqual(ast.body[0].argnames[0].is_array, true);
+
+        // Check content outer destructuring array
+        assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_SymbolFunarg);
+        assert(ast.body[0].argnames[0].names[1] instanceof UglifyJS.AST_SymbolFunarg);
+        assert(ast.body[0].argnames[0].names[2] instanceof UglifyJS.AST_Destructuring);
+        assert.strictEqual(ast.body[0].argnames[0].names[2].is_array, true);
+
+        // Check content nested destructuring array
+        assert.strictEqual(ast.body[0].argnames[0].names[2].names.length, 2);
+        assert(ast.body[0].argnames[0].names[2].names[0] instanceof UglifyJS.AST_SymbolFunarg);
+        assert(ast.body[0].argnames[0].names[2].names[1] instanceof UglifyJS.AST_Expansion);
+        assert(ast.body[0].argnames[0].names[2].names[1].expression instanceof UglifyJS.AST_SymbolFunarg);
+
+
+        ast = UglifyJS.parse("function foo({a: [b, ...c]}){}");
+        assert(ast.body[0] instanceof UglifyJS.AST_Defun);
+        assert.strictEqual(ast.body[0].argnames.length, 1);
+
+        // Check first parameter
+        assert(ast.body[0].argnames[0] instanceof UglifyJS.AST_Destructuring);
+        assert.strictEqual(ast.body[0].argnames[0].is_array, false);
+
+        // Check outer destructuring object
+        assert.strictEqual(ast.body[0].argnames[0].names.length, 1);
+        assert(ast.body[0].argnames[0].names[0] instanceof UglifyJS.AST_ObjectKeyVal);
+        assert.strictEqual(ast.body[0].argnames[0].names[0].key, "a");
+        assert(ast.body[0].argnames[0].names[0].value instanceof UglifyJS.AST_Destructuring);
+        assert.strictEqual(ast.body[0].argnames[0].names[0].value.is_array, true);
+
+        // Check content nested destructuring array
+        assert.strictEqual(ast.body[0].argnames[0].names[0].value.names.length, 2);
+        assert(ast.body[0].argnames[0].names[0].value.names[0] instanceof UglifyJS.AST_SymbolFunarg);
+        assert(ast.body[0].argnames[0].names[0].value.names[1] instanceof UglifyJS.AST_Expansion);
+        assert(ast.body[0].argnames[0].names[0].value.names[1].expression instanceof UglifyJS.AST_SymbolFunarg);
+    });
+});

test/mocha/arrow.js

@@ -15,7 +15,7 @@ describe("Arrow functions", function() {
         }
         var error = function(e) {
             return e instanceof uglify.JS_Parse_Error &&
-                e.message === "SyntaxError: Unexpected token: expand (...)";
+                e.message === "Unexpected token: expand (...)";
         }
 
         for (var i = 0; i < tests.length; i++) {
@@ -33,7 +33,7 @@ describe("Arrow functions", function() {
         }
         var error = function(e) {
             return e instanceof uglify.JS_Parse_Error &&
-                e.message === "SyntaxError: Unexpected token: punc (,)";
+                e.message === "Unexpected token: punc (,)";
         }
 
         for (var i = 0; i < tests.length; i++) {
@@ -54,7 +54,7 @@ describe("Arrow functions", function() {
         }
         var error = function(e) {
             return e instanceof uglify.JS_Parse_Error &&
-                e.message === "SyntaxError: Unexpected newline before arrow (=>)";
+                e.message === "Unexpected newline before arrow (=>)";
         }
 
         for (var i = 0; i < tests.length; i++) {
@@ -73,11 +73,331 @@ describe("Arrow functions", function() {
         }
         var error = function(e) {
             return e instanceof uglify.JS_Parse_Error &&
-                e.message === "SyntaxError: Unexpected token: arrow (=>)";
+                e.message === "Unexpected token: arrow (=>)";
         }
 
         for (var i = 0; i < tests.length; i++) {
             assert.throws(test(tests[i]), error);
         }
     });
+
+    it("Should parse a function containing default assignment correctly", function() {
+        var ast = uglify.parse("var a = (a = 123) => {}");
+        assert(ast.body[0] instanceof uglify.AST_Var);
+        assert.strictEqual(ast.body[0].definitions.length, 1);
+        assert(ast.body[0].definitions[0] instanceof uglify.AST_VarDef);
+        assert(ast.body[0].definitions[0].name instanceof uglify.AST_SymbolVar);
+        assert(ast.body[0].definitions[0].value instanceof uglify.AST_Arrow);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames.length, 1);
+
+        // First argument
+        assert(ast.body[0].definitions[0].value.argnames[0] instanceof uglify.AST_DefaultAssign);
+        assert(ast.body[0].definitions[0].value.argnames[0].left instanceof uglify.AST_SymbolFunarg);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].operator, "=");
+        assert(ast.body[0].definitions[0].value.argnames[0].right instanceof uglify.AST_Number);
+
+        ast = uglify.parse("var a = (a = a) => {}");
+        assert(ast.body[0] instanceof uglify.AST_Var);
+        assert.strictEqual(ast.body[0].definitions.length, 1);
+        assert(ast.body[0].definitions[0] instanceof uglify.AST_VarDef);
+        assert(ast.body[0].definitions[0].name instanceof uglify.AST_SymbolVar);
+        assert(ast.body[0].definitions[0].value instanceof uglify.AST_Arrow);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames.length, 1);
+
+        // First argument
+        assert(ast.body[0].definitions[0].value.argnames[0] instanceof uglify.AST_DefaultAssign);
+        assert(ast.body[0].definitions[0].value.argnames[0].left instanceof uglify.AST_SymbolFunarg);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].operator, "=");
+        assert(ast.body[0].definitions[0].value.argnames[0].right instanceof uglify.AST_SymbolRef);
+    });
+
+    it("Should parse a function containing default assignments in destructuring correctly", function() {
+        var ast = uglify.parse("var a = ([a = 123]) => {}");
+        assert(ast.body[0] instanceof uglify.AST_Var);
+        assert.strictEqual(ast.body[0].definitions.length, 1);
+        assert(ast.body[0].definitions[0] instanceof uglify.AST_VarDef);
+        assert(ast.body[0].definitions[0].name instanceof uglify.AST_SymbolVar);
+        assert(ast.body[0].definitions[0].value instanceof uglify.AST_Arrow);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames.length, 1);
+
+        // First argument
+        assert(ast.body[0].definitions[0].value.argnames[0] instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].is_array, true);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names.length, 1);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0] instanceof uglify.AST_DefaultAssign);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0].left instanceof uglify.AST_SymbolFunarg);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names[0].operator, "=");
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0].right instanceof uglify.AST_Number);
+
+
+        ast = uglify.parse("var a = ({a = 123}) => {}");
+        assert(ast.body[0] instanceof uglify.AST_Var);
+        assert.strictEqual(ast.body[0].definitions.length, 1);
+        assert(ast.body[0].definitions[0] instanceof uglify.AST_VarDef);
+        assert(ast.body[0].definitions[0].name instanceof uglify.AST_SymbolVar);
+        assert(ast.body[0].definitions[0].value instanceof uglify.AST_Arrow);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames.length, 1);
+
+        // First argument
+        assert(ast.body[0].definitions[0].value.argnames[0] instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].is_array, false);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names.length, 1);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0] instanceof uglify.AST_ObjectKeyVal);
+
+        // First object element in first argument
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names[0].key, "a");
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0].value instanceof uglify.AST_DefaultAssign);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0].value.left instanceof uglify.AST_SymbolFunarg);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names[0].value.operator, "=");
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0].value.right instanceof uglify.AST_Number);
+
+
+        ast = uglify.parse("var a = ({a: a = 123}) => {}");
+        assert(ast.body[0] instanceof uglify.AST_Var);
+        assert.strictEqual(ast.body[0].definitions.length, 1);
+        assert(ast.body[0].definitions[0] instanceof uglify.AST_VarDef);
+        assert(ast.body[0].definitions[0].name instanceof uglify.AST_SymbolVar);
+        assert(ast.body[0].definitions[0].value instanceof uglify.AST_Arrow);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames.length, 1);
+
+        // First argument
+        assert(ast.body[0].definitions[0].value.argnames[0] instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].is_array, false);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names.length, 1);
+
+        // Content destructuring of first argument
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0] instanceof uglify.AST_ObjectProperty);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names[0].key, "a");
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0].value instanceof uglify.AST_DefaultAssign);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0].value.left instanceof uglify.AST_SymbolFunarg);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names[0].value.operator, "=");
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0].value.right instanceof uglify.AST_Number);
+    });
+
+    it("Should parse a function containing default assignments in complex destructuring correctly", function() {
+        var ast = uglify.parse("var a = ([a, [b = 123]]) => {}");
+        assert(ast.body[0] instanceof uglify.AST_Var);
+        assert.strictEqual(ast.body[0].definitions.length, 1);
+        assert(ast.body[0].definitions[0] instanceof uglify.AST_VarDef);
+        assert(ast.body[0].definitions[0].name instanceof uglify.AST_SymbolVar);
+        assert(ast.body[0].definitions[0].value instanceof uglify.AST_Arrow);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames.length, 1);
+
+        // Check first argument
+        assert(ast.body[0].definitions[0].value.argnames[0] instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].is_array, true);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names.length, 2);
+
+        // Check whole destructuring structure of first argument
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0] instanceof uglify.AST_SymbolFunarg);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[1] instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names[1].is_array, true);
+
+        // Check content of second destructuring element (which is the nested destructuring pattern)
+        assert(ast.body[0].definitions[0].value.argnames[0].names[1].names[0] instanceof uglify.AST_DefaultAssign);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[1].names[0].left instanceof uglify.AST_SymbolFunarg);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names[1].names[0].operator, "=");
+        assert(ast.body[0].definitions[0].value.argnames[0].names[1].names[0].right instanceof uglify.AST_Number);
+
+
+        ast = uglify.parse("var a = ([a, {b: c = 123}]) => {}");
+        assert(ast.body[0] instanceof uglify.AST_Var);
+        assert.strictEqual(ast.body[0].definitions.length, 1);
+        assert(ast.body[0].definitions[0] instanceof uglify.AST_VarDef);
+        assert(ast.body[0].definitions[0].name instanceof uglify.AST_SymbolVar);
+        assert(ast.body[0].definitions[0].value instanceof uglify.AST_Arrow);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames.length, 1);
+
+        // Check first argument
+        assert(ast.body[0].definitions[0].value.argnames[0] instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].is_array, true);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names.length, 2);
+
+        // Check whole destructuring structure of first argument
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0] instanceof uglify.AST_SymbolFunarg);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[1] instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names[1].is_array, false);
+
+        // Check content of second destructuring element (which is the nested destructuring pattern)
+        assert(ast.body[0].definitions[0].value.argnames[0].names[1].names[0] instanceof uglify.AST_ObjectKeyVal);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names[1].names[0].key, "b");
+        assert(ast.body[0].definitions[0].value.argnames[0].names[1].names[0].value instanceof uglify.AST_DefaultAssign);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[1].names[0].value.left instanceof uglify.AST_SymbolFunarg);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names[1].names[0].value.operator, "=");
+        assert(ast.body[0].definitions[0].value.argnames[0].names[1].names[0].value.right instanceof uglify.AST_Number);
+
+
+        ast = uglify.parse("var a = ({a, b: {b = 123}}) => {}");
+        assert(ast.body[0] instanceof uglify.AST_Var);
+        assert.strictEqual(ast.body[0].definitions.length, 1);
+        assert(ast.body[0].definitions[0] instanceof uglify.AST_VarDef);
+        assert(ast.body[0].definitions[0].name instanceof uglify.AST_SymbolVar);
+        assert(ast.body[0].definitions[0].value instanceof uglify.AST_Arrow);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames.length, 1);
+
+        // Check first argument
+        assert(ast.body[0].definitions[0].value.argnames[0] instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].is_array, false);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names.length, 2);
+
+        // First argument, property 1
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0] instanceof uglify.AST_ObjectKeyVal);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names[0].key, "a");
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0].value instanceof uglify.AST_SymbolFunarg);
+
+        // First argument, property 2
+        assert(ast.body[0].definitions[0].value.argnames[0].names[1] instanceof uglify.AST_ObjectKeyVal);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names[1].key, "b");
+        assert(ast.body[0].definitions[0].value.argnames[0].names[1].value instanceof uglify.AST_Destructuring);
+
+        // Check content of nested destructuring
+        var content = ast.body[0].definitions[0].value.argnames[0].names[1].value
+        assert.strictEqual(content.is_array, false);
+        assert.strictEqual(content.names.length, 1);
+        assert(content.names[0] instanceof uglify.AST_ObjectKeyVal);
+
+        // Content of first property in nested destructuring
+        assert.strictEqual(content.names[0].key, "b");
+        assert(content.names[0].value instanceof uglify.AST_DefaultAssign);
+        assert(content.names[0].value.left instanceof uglify.AST_SymbolFunarg);
+        assert.strictEqual(content.names[0].value.operator, "=");
+        assert(content.names[0].value.right instanceof uglify.AST_Number);
+
+
+        ast = uglify.parse("var a = ({a: {b = 123}}) => {}");
+        assert(ast.body[0] instanceof uglify.AST_Var);
+        assert.strictEqual(ast.body[0].definitions.length, 1);
+        assert(ast.body[0].definitions[0] instanceof uglify.AST_VarDef);
+        assert(ast.body[0].definitions[0].name instanceof uglify.AST_SymbolVar);
+        assert(ast.body[0].definitions[0].value instanceof uglify.AST_Arrow);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames.length, 1);
+
+        // Check first argument
+        assert(ast.body[0].definitions[0].value.argnames[0] instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].is_array, false);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names.length, 1);
+
+        // Check whole destructuring structure of first argument
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0] instanceof uglify.AST_ObjectKeyVal);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names[0].key, "a");
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0].value instanceof uglify.AST_Destructuring);
+
+        // Check content of nested destructuring
+        content = ast.body[0].definitions[0].value.argnames[0].names[0].value
+        assert.strictEqual(content.is_array, false);
+        assert.strictEqual(content.names.length, 1);
+        assert(content.names[0] instanceof uglify.AST_ObjectKeyVal);
+
+        // Check first property of nested destructuring
+        assert.strictEqual(content.names[0].key, "b");
+        assert(content.names[0].value instanceof uglify.AST_DefaultAssign);
+        assert(content.names[0].value.left instanceof uglify.AST_SymbolFunarg);
+        assert.strictEqual(content.names[0].value.operator, "=");
+        assert(content.names[0].value.right instanceof uglify.AST_Number);
+    });
+
+    it("Should parse spread correctly", function() {
+        var ast = uglify.parse("var a = (a, b, ...c) => {}");
+        assert(ast.body[0] instanceof uglify.AST_Var);
+        assert.strictEqual(ast.body[0].definitions.length, 1);
+        assert(ast.body[0].definitions[0] instanceof uglify.AST_VarDef);
+        assert(ast.body[0].definitions[0].name instanceof uglify.AST_SymbolVar);
+        assert(ast.body[0].definitions[0].value instanceof uglify.AST_Arrow);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames.length, 3);
+
+        // Check parameters
+        assert(ast.body[0].definitions[0].value.argnames[0] instanceof uglify.AST_SymbolFunarg);
+        assert(ast.body[0].definitions[0].value.argnames[1] instanceof uglify.AST_SymbolFunarg);
+        assert(ast.body[0].definitions[0].value.argnames[2] instanceof uglify.AST_Expansion);
+        assert(ast.body[0].definitions[0].value.argnames[2].expression instanceof uglify.AST_SymbolFunarg);
+
+
+        ast = uglify.parse("var a = ([a, b, ...c]) => {}");
+        assert(ast.body[0] instanceof uglify.AST_Var);
+        assert.strictEqual(ast.body[0].definitions.length, 1);
+        assert(ast.body[0].definitions[0] instanceof uglify.AST_VarDef);
+        assert(ast.body[0].definitions[0].name instanceof uglify.AST_SymbolVar);
+        assert(ast.body[0].definitions[0].value instanceof uglify.AST_Arrow);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames.length, 1);
+
+        // Check first parameter
+        assert(ast.body[0].definitions[0].value.argnames[0] instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].is_array, true);
+
+        // Check content first parameter
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0] instanceof uglify.AST_SymbolFunarg);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[1] instanceof uglify.AST_SymbolFunarg);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[2] instanceof uglify.AST_Expansion);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[2].expression instanceof uglify.AST_SymbolFunarg);
+
+
+        ast = uglify.parse("var a = ([a, b, [c, ...d]]) => {}");
+        assert(ast.body[0] instanceof uglify.AST_Var);
+        assert.strictEqual(ast.body[0].definitions.length, 1);
+        assert(ast.body[0].definitions[0] instanceof uglify.AST_VarDef);
+        assert(ast.body[0].definitions[0].name instanceof uglify.AST_SymbolVar);
+        assert(ast.body[0].definitions[0].value instanceof uglify.AST_Arrow);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames.length, 1);
+
+        // Check first parameter
+        assert(ast.body[0].definitions[0].value.argnames[0] instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].is_array, true);
+
+        // Check content outer destructuring array
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0] instanceof uglify.AST_SymbolFunarg);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[1] instanceof uglify.AST_SymbolFunarg);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[2] instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names[2].is_array, true);
+
+        // Check content nested destructuring array
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names[2].names.length, 2);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[2].names[0] instanceof uglify.AST_SymbolFunarg);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[2].names[1] instanceof uglify.AST_Expansion);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[2].names[1].expression instanceof uglify.AST_SymbolFunarg);
+
+
+        ast = uglify.parse("var a = ({a: [b, ...c]}) => {}");
+        assert(ast.body[0] instanceof uglify.AST_Var);
+        assert.strictEqual(ast.body[0].definitions.length, 1);
+        assert(ast.body[0].definitions[0] instanceof uglify.AST_VarDef);
+        assert(ast.body[0].definitions[0].name instanceof uglify.AST_SymbolVar);
+        assert(ast.body[0].definitions[0].value instanceof uglify.AST_Arrow);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames.length, 1);
+
+        // Check first parameter
+        assert(ast.body[0].definitions[0].value.argnames[0] instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].is_array, false);
+
+        // Check outer destructuring object
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names.length, 1);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0] instanceof uglify.AST_ObjectKeyVal);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names[0].key, "a");
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0].value instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names[0].value.is_array, true);
+
+        // Check content nested destructuring array
+        assert.strictEqual(ast.body[0].definitions[0].value.argnames[0].names[0].value.names.length, 2);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0].value.names[0] instanceof uglify.AST_SymbolFunarg);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0].value.names[1] instanceof uglify.AST_Expansion);
+        assert(ast.body[0].definitions[0].value.argnames[0].names[0].value.names[1].expression instanceof uglify.AST_SymbolFunarg);
+    });
+
+    it("Should handle arrow function with bind", function() {
+        function minify(code) {
+            return uglify.minify(code, {
+                fromString: true,
+                mangle: false
+            }).code;
+        }
+
+        assert.strictEqual(
+            minify(minify("test(((index) => { console.log(this, index); }).bind(this, 1));")),
+            "test((index=>{console.log(this,index)}).bind(this,1));"
+        );
+        assert.strictEqual(
+            minify(minify('test(((index) => { console.log(this, index); })["bind"](this, 1));')),
+            "test((index=>{console.log(this,index)}).bind(this,1));"
+        );
+    });
+
 });

test/mocha/class.js

@@ -16,7 +16,7 @@ describe("Class", function() {
         }
         var error = function(e) {
             return e instanceof uglify.JS_Parse_Error &&
-                e.message.substr(0, 31) === "SyntaxError: Unexpected token: ";
+                /^Unexpected token: /.test(e.message);
         }
 
         for (var i = 0; i < tests.length; i++) {

test/mocha/cli.js

@@ -1,5 +1,6 @@
 var assert = require("assert");
 var exec = require("child_process").exec;
+var readFileSync = require("fs").readFileSync;
 
 describe("bin/uglifyjs", function () {
     var uglifyjscmd = '"' + process.argv[0] + '" bin/uglifyjs';
@@ -56,7 +57,7 @@ describe("bin/uglifyjs", function () {
            if (err) throw err;
 
            assert.strictEqual(stdout, "var bar=function(){function foo(bar){return bar}return foo}();\n" +
-               "//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInRlc3QvaW5wdXQvaXNzdWUtMTMyMy9zYW1wbGUuanMiXSwibmFtZXMiOlsiYmFyIiwiZm9vIl0sIm1hcHBpbmdzIjoiQUFBQSxHQUFJQSxLQUFPLFdBQ1AsUUFBU0MsS0FBS0QsS0FDVixNQUFPQSxLQUdYLE1BQU9DIn0=\n");
+               "//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInRlc3QvaW5wdXQvaXNzdWUtMTMyMy9zYW1wbGUuanMiXSwibmFtZXMiOlsiYmFyIiwiZm9vIl0sIm1hcHBpbmdzIjoiQUFBQSxHQUFJQSxLQUFNLFdBQ04sUUFBU0MsS0FBS0QsS0FDVixNQUFPQSxLQUdYLE1BQU9DIn0=\n");
            done();
        });
     });
@@ -70,4 +71,184 @@ describe("bin/uglifyjs", function () {
             done();
         });
     });
+    it("Should work with --keep-fnames (mangle only)", function (done) {
+       var command = uglifyjscmd + ' test/input/issue-1431/sample.js --keep-fnames -m';
+
+       exec(command, function (err, stdout) {
+           if (err) throw err;
+
+           assert.strictEqual(stdout, "function f(r){return function(){function n(n){return n*n}return r(n)}}function g(n){return n(1)+n(2)}console.log(f(g)()==5);\n");
+           done();
+       });
+    });
+    it("Should work with --keep-fnames (mangle & compress)", function (done) {
+       var command = uglifyjscmd + ' test/input/issue-1431/sample.js --keep-fnames -m -c unused=false';
+
+       exec(command, function (err, stdout) {
+           if (err) throw err;
+
+           assert.strictEqual(stdout, "function f(r){return function(){function n(n){return n*n}return r(n)}}function g(n){return n(1)+n(2)}console.log(5==f(g)());\n");
+           done();
+       });
+    });
+    it("Should work with keep_fnames under mangler options", function (done) {
+       var command = uglifyjscmd + ' test/input/issue-1431/sample.js -m keep_fnames=true';
+
+       exec(command, function (err, stdout) {
+           if (err) throw err;
+
+           assert.strictEqual(stdout, "function f(r){return function(){function n(n){return n*n}return r(n)}}function g(n){return n(1)+n(2)}console.log(f(g)()==5);\n");
+           done();
+       });
+    });
+    it("Should work with --define (simple)", function (done) {
+       var command = uglifyjscmd + ' test/input/global_defs/simple.js --define D=5 -c';
+
+       exec(command, function (err, stdout) {
+           if (err) throw err;
+
+           assert.strictEqual(stdout, "console.log(5);\n");
+           done();
+       });
+    });
+    it("Should work with --define (nested)", function (done) {
+       var command = uglifyjscmd + ' test/input/global_defs/nested.js --define C.D=5,C.V=3 -c';
+
+       exec(command, function (err, stdout) {
+           if (err) throw err;
+
+           assert.strictEqual(stdout, "console.log(3,5);\n");
+           done();
+       });
+    });
+    it("Should work with --define (AST_Node)", function (done) {
+       var command = uglifyjscmd + ' test/input/global_defs/simple.js --define console.log=stdout.println -c';
+
+       exec(command, function (err, stdout) {
+           if (err) throw err;
+
+           assert.strictEqual(stdout, "stdout.println(D);\n");
+           done();
+       });
+    });
+    it("Should work with `--beautify`", function (done) {
+       var command = uglifyjscmd + ' test/input/issue-1482/input.js -b';
+
+       exec(command, function (err, stdout) {
+           if (err) throw err;
+
+           assert.strictEqual(stdout, readFileSync("test/input/issue-1482/default.js", "utf8"));
+           done();
+       });
+    });
+    it("Should work with `--beautify bracketize`", function (done) {
+       var command = uglifyjscmd + ' test/input/issue-1482/input.js -b bracketize';
+
+       exec(command, function (err, stdout) {
+           if (err) throw err;
+
+           assert.strictEqual(stdout, readFileSync("test/input/issue-1482/bracketize.js", "utf8"));
+           done();
+       });
+    });
+    it("Should process inline source map", function(done) {
+        var command = uglifyjscmd + ' test/input/issue-520/input.js -cm toplevel --in-source-map inline --source-map-inline';
+
+        exec(command, function (err, stdout) {
+            if (err) throw err;
+
+            assert.strictEqual(stdout, readFileSync("test/input/issue-520/output.js", "utf8"));
+            done();
+        });
+    });
+    it("Should warn for missing inline source map", function(done) {
+        var command = uglifyjscmd + ' test/input/issue-1323/sample.js --in-source-map inline';
+
+        exec(command, function (err, stdout, stderr) {
+            if (err) throw err;
+
+            assert.strictEqual(stdout, "var bar=function(){function foo(bar){return bar}return foo}();\n");
+            assert.strictEqual(stderr, "WARN: inline source map not found\n");
+            done();
+        });
+    });
+    it("Should fail with multiple input and inline source map", function(done) {
+        var command = uglifyjscmd + ' test/input/issue-520/input.js test/input/issue-520/output.js --in-source-map inline --source-map-inline';
+
+        exec(command, function (err, stdout, stderr) {
+            assert.ok(err);
+            assert.strictEqual(stderr, "ERROR: Inline source map only works with singular input\n");
+            done();
+        });
+    });
+    it("Should fail with acorn and inline source map", function(done) {
+        var command = uglifyjscmd + ' test/input/issue-520/input.js --in-source-map inline --source-map-inline --acorn';
+
+        exec(command, function (err, stdout, stderr) {
+            assert.ok(err);
+            assert.strictEqual(stderr, "ERROR: Inline source map only works with built-in parser\n");
+            done();
+        });
+    });
+    it("Should fail with SpiderMonkey and inline source map", function(done) {
+        var command = uglifyjscmd + ' test/input/issue-520/input.js --in-source-map inline --source-map-inline --spidermonkey';
+
+        exec(command, function (err, stdout, stderr) {
+            assert.ok(err);
+            assert.strictEqual(stderr, "ERROR: Inline source map only works with built-in parser\n");
+            done();
+        });
+    });
+    it("Should fail with invalid syntax", function(done) {
+        var command = uglifyjscmd + ' test/input/invalid/simple.js';
+
+        exec(command, function (err, stdout, stderr) {
+            assert.ok(err);
+            var lines = stderr.split(/\n/);
+            assert.strictEqual(lines[0], "Parse error at test/input/invalid/simple.js:1,12");
+            assert.strictEqual(lines[1], "function f(a{}");
+            assert.strictEqual(lines[2], "            ^");
+            assert.strictEqual(lines[3], "SyntaxError: Unexpected token punc «{», expected punc «,»");
+            done();
+        });
+    });
+    it("Should fail with correct marking of tabs", function(done) {
+        var command = uglifyjscmd + ' test/input/invalid/tab.js';
+
+        exec(command, function (err, stdout, stderr) {
+            assert.ok(err);
+            var lines = stderr.split(/\n/);
+            assert.strictEqual(lines[0], "Parse error at test/input/invalid/tab.js:1,12");
+            assert.strictEqual(lines[1], "\t\tfoo(\txyz, 0abc);");
+            assert.strictEqual(lines[2], "\t\t    \t     ^");
+            assert.strictEqual(lines[3], "SyntaxError: Invalid syntax: 0abc");
+            done();
+        });
+    });
+    it("Should fail with correct marking at start of line", function(done) {
+        var command = uglifyjscmd + ' test/input/invalid/eof.js';
+
+        exec(command, function (err, stdout, stderr) {
+            assert.ok(err);
+            var lines = stderr.split(/\n/);
+            assert.strictEqual(lines[0], "Parse error at test/input/invalid/eof.js:2,0");
+            assert.strictEqual(lines[1], "foo, bar(");
+            assert.strictEqual(lines[2], "         ^");
+            assert.strictEqual(lines[3], "SyntaxError: Unexpected token: eof (undefined)");
+            done();
+        });
+    });
+    it("Should fail with a missing loop body", function(done) {
+        var command = uglifyjscmd + ' test/input/invalid/loop-no-body.js';
+
+        exec(command, function (err, stdout, stderr) {
+            assert.ok(err);
+            var lines = stderr.split(/\n/);
+            assert.strictEqual(lines[0], "Parse error at test/input/invalid/loop-no-body.js:2,0");
+            assert.strictEqual(lines[1], "for (var i = 0; i < 1; i++) ");
+            assert.strictEqual(lines[2], "                            ^");
+            assert.strictEqual(lines[3], "SyntaxError: Unexpected token: eof (undefined)");
+            done();
+        });
+    });
 });

test/mocha/comment-filter.js

@@ -72,4 +72,12 @@ describe("comment filters", function() {
         assert.strictEqual(UglifyJS.parse("/* ok */ function a(){}").print_to_string(options), "/* ok */function a(){}");
         assert.strictEqual(UglifyJS.parse("/* ok */ function a(){}").print_to_string(options), "/* ok */function a(){}");
     });
+
+    it("Should handle shebang and preamble correctly", function() {
+        var code = UglifyJS.minify("#!/usr/bin/node\nvar x = 10;", {
+            fromString: true,
+            output: { preamble: "/* Build */" }
+        }).code;
+        assert.strictEqual(code, "#!/usr/bin/node\n/* Build */\nvar x=10;");
+    })
 });

test/mocha/comment.js

@@ -13,7 +13,7 @@ describe("Comment", function() {
 
         var fail = function(e) {
             return e instanceof uglify.JS_Parse_Error &&
-                e.message === "SyntaxError: Unexpected token: operator (>)" &&
+                e.message === "Unexpected token: operator (>)" &&
                 e.line === 2 &&
                 e.col === 0;
         }
@@ -37,7 +37,7 @@ describe("Comment", function() {
 
         var fail = function(e) {
             return e instanceof uglify.JS_Parse_Error &&
-                e.message === "SyntaxError: Unexpected token: operator (>)" &&
+                e.message === "Unexpected token: operator (>)" &&
                 e.line === 5 &&
                 e.col === 0;
         }

test/mocha/comment_before_constant.js

@@ -7,7 +7,7 @@ describe("comment before constant", function() {
     it("Should test comment before constant is retained and output after mangle.", function() {
         var result = Uglify.minify(js, {
             fromString: true,
-            compress: { collapse_vars: false },
+            compress: { collapse_vars: false, reduce_vars: false },
             mangle: {},
             output: { comments: true },
         });
@@ -17,9 +17,9 @@ describe("comment before constant", function() {
     it("Should test code works when comments disabled.", function() {
         var result = Uglify.minify(js, {
             fromString: true,
-            compress: { collapse_vars: false },
+            compress: { collapse_vars: false, reduce_vars: false },
             mangle: {},
-            output: {},
+            output: { comments: false },
         });
         assert.strictEqual(result.code, 'function f(){var n=!1;return n}');
     });

test/mocha/destructuring.js

@@ -0,0 +1,138 @@
+var assert = require("assert");
+var uglify = require("../../");
+
+describe("Destructuring", function() {
+    it("Should generate similar trees for destructuring in left hand side expressions, definitions, functions and arrow functions", function() {
+        var patterns = [
+            "[]",
+            "{}",
+
+            "[a, b, c]",
+            "{a: b, c: d}",
+            "{a}",
+            "{a, b}",
+
+            "{a: {}}",
+            "{a: []}",
+            "[{}]",
+            "[[]]",
+            "{a: {b}}",
+
+            // Can't do `a = 123` with lhs expression, so only test in destructuring
+            "[foo = bar]",
+            "{a = 123}",
+            "[{foo: abc = 123}]",
+            "{foo: [abc = 123]}",
+
+            "[...foo]",
+            "[...{}]",
+            "[...[]]"
+
+            // Can't do `...` because that is an invalid lhs expression, spread in array destructuring should be fine though
+        ];
+
+        var types = [
+            {
+                name: "lhs",
+                symbolType: uglify.AST_SymbolRef,
+                tree: function (ast) {
+                    return ast.body[0].body.left;
+                },
+                generate: function (code) {
+                    return "(" + code + " = a)";
+                }
+            },
+            {
+                name: "var",
+                symbolType: uglify.AST_SymbolVar,
+                tree: function (ast) {
+                    return ast.body[0].definitions[0].name;
+                },
+                generate: function (code) {
+                    return "var " + code + " = a";
+                }
+            },
+            {
+                name: "function",
+                symbolType: uglify.AST_SymbolFunarg,
+                tree: function (ast) {
+                    return ast.body[0].argnames[0];
+                },
+                generate: function (code) {
+                    return "function a(" + code + ") {}";
+                }
+            },
+            {
+                name: "arrow",
+                symbolType: uglify.AST_SymbolFunarg,
+                tree: function (ast) {
+                    return ast.body[0].definitions[0].value.argnames[0];
+                },
+                generate: function (code) {
+                    return "var a = (" + code + ") => {}";
+                }
+            }
+        ];
+
+        var walker = function(type, ref, code, result) {
+            var w = new uglify.TreeWalker(function(node) {
+                if (w.parent() instanceof uglify.AST_DefaultAssign &&
+                    w.parent().right === node
+                ) {
+                    return true; // Don't check the content of the default assignment
+
+                } else if (node instanceof uglify.AST_Symbol) {
+                    assert(node instanceof type.symbolType,
+                        node.TYPE + " while " + type.symbolType.TYPE + " expected at pos " +
+                        node.start.pos + " in `" + code + "`  (" + ref + ")"
+                    );
+
+                    result.push([
+                        new uglify.AST_Symbol({
+                            start: node.start,
+                            name: node.name,
+                            end: node.end
+                        }),
+                        w.parent()
+                    ]);
+
+                    return;
+                }
+
+                result.push([node, w.parent()]);
+            });
+
+            return w;
+        };
+
+        var getNodeType = function(node) {
+            return node[0].TYPE + (node[1] ? " " + node[1].TYPE : "");
+        }
+
+        for (var i = 0; i < patterns.length; i++) {
+            var results = [];
+
+            for (var j = 0; j < types.length; j++) {
+                var code = types[j].generate(patterns[i])
+                var ast = types[j].tree(
+                    uglify.parse(code)
+                );
+                results.push([]);
+                ast.walk(walker(
+                    types[j],
+                    "`" + patterns[i] + "` on " + types[j].name,
+                    code,
+                    results[j]
+                ));
+
+                if (j > 0) {
+                    assert.deepEqual(
+                        results[0].map(getNodeType),
+                        results[j].map(getNodeType),
+                        "AST disagree on " + patterns[i] + " with " + types[j].name
+                    );
+                }
+            }
+        }
+    });
+});

test/mocha/directives.js

@@ -178,7 +178,7 @@ describe("Directives", function() {
                 throw new Error("Expected parser to fail");
             } catch (e) {
                 assert.strictEqual(e instanceof uglify.JS_Parse_Error, true);
-                assert.strictEqual(e.message, "SyntaxError: Unexpected token: punc (])");
+                assert.strictEqual(e.message, "Unexpected token: punc (])");
             }
 
             test_directive(tokenizer, tests[i]);

test/mocha/eof.js

@@ -4,8 +4,7 @@ var uglify = require("../../");
 describe("EOF", function() {
     it("Should test code for at least throwing syntax error when incomplete", function() {
         var error = function(e) {
-            return e instanceof uglify.JS_Parse_Error &&
-                /^SyntaxError: /.test(e.message);
+            return e instanceof uglify.JS_Parse_Error;
         }
         var parse = function(test) {
             return function() {

test/mocha/expression.js

@@ -16,7 +16,7 @@ describe("Expression", function() {
 
         var fail = function(e) {
             return e instanceof uglify.JS_Parse_Error &&
-                /^SyntaxError: Unexpected token: operator \((?:[!+~-]|void|typeof|delete)\)/.test(e.message);
+                /^Unexpected token: operator \((?:[!+~-]|void|typeof|delete)\)/.test(e.message);
         }
 
         var exec = function(test) {

test/mocha/function.js

@@ -47,64 +47,83 @@ describe("Function", function() {
         assert.equal(destruct3.is_array, false);
         assert.equal(destruct4.is_array, true);
 
-        var aAndB = [
-            ['SymbolFunarg', 'a'],
-            ['SymbolFunarg', 'b']
-        ];
-
+        // destruct 1
         assert.deepEqual(
             [
                 destruct1.names[0].TYPE,
-                destruct1.names[0].name
+                destruct1.names[0].key,
+                destruct1.names[0].value.name
             ],
-            aAndB[0]);
+            ['ObjectKeyVal', 'a', 'a']
+        );
         assert.deepEqual(
             [
                 destruct1.names[1].TYPE,
-                destruct1.names[1].name
+                destruct1.names[1].key,
+                destruct1.names[1].value.name
             ],
-            aAndB[1]);
+            ['ObjectKeyVal', 'b', 'b']
+        );
+
+        // destruct 2
         assert.deepEqual(
             [
                 destruct2.names[0].TYPE,
                 destruct2.names[0].name
             ],
-            aAndB[0]);
+            ['SymbolFunarg', 'a']
+        );
         assert.deepEqual(
             [
                 destruct2.names[1].names[0].TYPE,
                 destruct2.names[1].names[0].name
             ],
-            aAndB[1]);
+            ['SymbolFunarg', 'b']
+        );
+
+        // destruct 3
         assert.strictEqual(typeof destruct3.names[0].key, "string");
         assert.strictEqual(destruct3.names[0].key, "a");
+        assert.strictEqual(destruct3.names[0].value.TYPE, "SymbolFunarg");
+        assert.strictEqual(destruct3.names[0].value.name, "a");
         assert.strictEqual(typeof destruct3.names[1].key, "string");
         assert.strictEqual(destruct3.names[1].key, "b");
+        assert.strictEqual(destruct3.names[1].value.TYPE, "SymbolFunarg");
+        assert.strictEqual(destruct3.names[1].value.name, "b");
+
+        // destruct 4
         assert.deepEqual(
             [
                 destruct4.names[0].TYPE,
                 destruct4.names[0].name
             ],
-            aAndB[0]);
+            ['SymbolFunarg', 'a']
+        );
+        assert.strictEqual(destruct4.names[1].TYPE, "Destructuring");
         assert.deepEqual(
             [
                 destruct4.names[1].names[0].TYPE,
                 destruct4.names[1].names[0].name
             ],
-            aAndB[1]);
+            ['SymbolFunarg', 'b']
+        );
 
         assert.deepEqual(
             get_args(destr_fun1.args_as_names()),
-            aAndB);
+            [['SymbolFunarg', 'a'], ['SymbolFunarg', 'b']]
+        );
         assert.deepEqual(
             get_args(destr_fun2.args_as_names()),
-            aAndB);
+            [['SymbolFunarg', 'a'], ['SymbolFunarg', 'b']]
+        );
         assert.deepEqual(
             get_args(destr_fun3.args_as_names()),
-            aAndB);
+            [['SymbolFunarg', 'a'], ['SymbolFunarg', 'b']]
+        );
         assert.deepEqual(
             get_args(destr_fun4.args_as_names()),
-            aAndB);
+            [['SymbolFunarg', 'a'], ['SymbolFunarg', 'b']]
+        );
 
         // Making sure we don't accidentally accept things which
         // Aren't argument destructurings
@@ -158,7 +177,7 @@ describe("Function", function() {
         }
         var error = function(e) {
             return e instanceof uglify.JS_Parse_Error &&
-                e.message.substr(0, 31) === "SyntaxError: Unexpected token: ";
+                /^Unexpected token: /.test(e.message);
         }
 
         for (var i = 0; i < tests.length; i++) {
@@ -177,7 +196,7 @@ describe("Function", function() {
         }
         var error = function(e) {
             return e instanceof uglify.JS_Parse_Error &&
-                e.message === "SyntaxError: Invalid function parameter";
+                e.message === "Invalid function parameter";
         }
         for (var i = 0; i < tests.length; i++) {
             assert.throws(test(tests[i]), error);
@@ -224,7 +243,7 @@ describe("Function", function() {
         }
         var error = function (e) {
             return e instanceof uglify.JS_Parse_Error &&
-                /^SyntaxError: Parameter [a-zA-Z]+ was used already$/.test(e.message);
+                /^Parameter [a-zA-Z]+ was used already$/.test(e.message);
         }
         for (var i = 0; i < tests.length; i++) {
             assert.throws(test(tests[i]), error, tests[i]);

test/mocha/getter-setter.js

@@ -0,0 +1,89 @@
+var UglifyJS = require('../../');
+var assert = require("assert");
+
+describe("Getters and setters", function() {
+    it("Should not accept operator symbols as getter/setter name", function() {
+        var illegalOperators = [
+            "++",
+            "--",
+            "+",
+            "-",
+            "!",
+            "~",
+            "&",
+            "|",
+            "^",
+            "*",
+            "/",
+            "%",
+            ">>",
+            "<<",
+            ">>>",
+            "<",
+            ">",
+            "<=",
+            ">=",
+            "==",
+            "===",
+            "!=",
+            "!==",
+            "?",
+            "=",
+            "+=",
+            "-=",
+            "/=",
+            "*=",
+            "%=",
+            ">>=",
+            "<<=",
+            ">>>=",
+            "|=",
+            "^=",
+            "&=",
+            "&&",
+            "||"
+        ];
+        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) {
+                return e instanceof UglifyJS.JS_Parse_Error &&
+                    /^Unexpected token: /.test(e.message);
+            };
+        };
+
+        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));
+        }
+    });
+
+});

test/mocha/glob.js

@@ -3,17 +3,13 @@ var assert = require("assert");
 
 describe("minify() with input file globs", function() {
     it("minify() with one input file glob string.", function() {
-        var result = Uglify.minify("test/input/issue-1242/foo.*", {
-            compress: { collapse_vars: true }
-        });
+        var result = Uglify.minify("test/input/issue-1242/foo.*");
         assert.strictEqual(result.code, 'function foo(o){print("Foo:",2*o)}var print=console.log.bind(console);');
     });
     it("minify() with an array of one input file glob.", function() {
         var result = Uglify.minify([
             "test/input/issue-1242/b*.es5",
-        ], {
-            compress: { collapse_vars: true }
-        });
+        ]);
         assert.strictEqual(result.code, 'function bar(n){return 3*n}function baz(n){return n/2}');
     });
     it("minify() with an array of multiple input file globs.", function() {
@@ -21,8 +17,8 @@ describe("minify() with input file globs", function() {
             "test/input/issue-1242/???.es5",
             "test/input/issue-1242/*.js",
         ], {
-            compress: { collapse_vars: true }
+            compress: { toplevel: true }
         });
-        assert.strictEqual(result.code, 'function bar(n){return 3*n}function baz(n){return n/2}function foo(n){print("Foo:",2*n)}var print=console.log.bind(console);print("qux",bar(3),baz(12)),foo(11);');
+        assert.strictEqual(result.code, 'var print=console.log.bind(console);print("qux",function(n){return 3*n}(3),function(n){return n/2}(12)),function(n){print("Foo:",2*n)}(11);');
     });
 });

test/mocha/lhs-expressions.js

@@ -7,17 +7,26 @@ describe("Left-hand side expressions", function () {
 
         assert.equal(decls.body[0].TYPE, 'Var');
         assert.equal(decls.body[0].definitions.length, 2);
+
+        // Item 1
         assert.equal(decls.body[0].definitions[0].name.TYPE, 'Destructuring');
         assert.equal(decls.body[0].definitions[0].value.TYPE, 'SymbolRef');
 
+        // Item 2
+        assert.equal(decls.body[0].definitions[1].name.TYPE, 'Destructuring');
+        assert.equal(decls.body[0].definitions[1].value.TYPE, 'SymbolRef');
+
         var nested_def = uglify.parse('var [{x}] = foo').body[0].definitions[0];
 
-        assert.equal(nested_def.name.names[0].names[0].TYPE, 'SymbolVar');
-        assert.equal(nested_def.name.names[0].names[0].name, 'x');
+        assert.equal(nested_def.name.names[0].names[0].TYPE, 'ObjectKeyVal');
+        assert.equal(nested_def.name.names[0].names[0].value.TYPE, 'SymbolVar');
+        assert.equal(nested_def.name.names[0].names[0].key, 'x');
+        assert.equal(nested_def.name.names[0].names[0].value.name, 'x');
 
         var holey_def = uglify.parse('const [,,third] = [1,2,3]').body[0].definitions[0];
 
         assert.equal(holey_def.name.names[0].TYPE, 'Hole');
+        assert.equal(holey_def.name.names[1].TYPE, 'Hole');
         assert.equal(holey_def.name.names[2].TYPE, 'SymbolConst');
 
         var expanding_def = uglify.parse('var [first, ...rest] = [1,2,3]').body[0].definitions[0];
@@ -26,4 +35,231 @@ describe("Left-hand side expressions", function () {
         assert.equal(expanding_def.name.names[1].TYPE, 'Expansion');
         assert.equal(expanding_def.name.names[1].expression.TYPE, 'SymbolVar');
     });
+
+    it("Parser should use AST_Array for array literals", function() {
+        var ast = uglify.parse('["foo", "bar"]');
+        assert(ast.body[0] instanceof uglify.AST_SimpleStatement);
+        assert(ast.body[0].body instanceof uglify.AST_Array);
+
+        ast = uglify.parse('a = ["foo"]');
+        assert(ast.body[0] instanceof uglify.AST_SimpleStatement);
+
+        assert(ast.body[0].body instanceof uglify.AST_Assign);
+        assert(ast.body[0].body.left instanceof uglify.AST_SymbolRef);
+        assert.equal(ast.body[0].body.operator, "=");
+        assert(ast.body[0].body.right instanceof uglify.AST_Array);
+    });
+
+    it("Parser should use AST_Object for object literals", function() {
+        var ast = uglify.parse('({foo: "bar"})');
+        assert(ast.body[0] instanceof uglify.AST_SimpleStatement);
+        assert(ast.body[0].body instanceof uglify.AST_Object);
+
+        // This example should be fine though
+        ast = uglify.parse('a = {foo: "bar"}');
+        assert(ast.body[0] instanceof uglify.AST_SimpleStatement);
+
+        assert(ast.body[0].body instanceof uglify.AST_Assign);
+        assert(ast.body[0].body.left instanceof uglify.AST_SymbolRef);
+        assert.equal(ast.body[0].body.operator, "=");
+        assert(ast.body[0].body.right instanceof uglify.AST_Object);
+    });
+
+    it("Parser should use AST_Destructuring for array assignment patterns", function() {
+        var ast = uglify.parse('[foo, bar] = [1, 2]');
+        assert(ast.body[0] instanceof uglify.AST_SimpleStatement);
+
+        assert(ast.body[0].body instanceof uglify.AST_Assign);
+        assert(ast.body[0].body.left instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].body.left.is_array, true);
+        assert.equal(ast.body[0].body.operator, "=");
+        assert(ast.body[0].body.right instanceof uglify.AST_Array);
+    });
+
+    it("Parser should use AST_Destructuring for object assignment patterns", function() {
+        var ast = uglify.parse('({a: b, b: c} = {b: "c", c: "d"})');
+        assert(ast.body[0] instanceof uglify.AST_SimpleStatement);
+
+        assert(ast.body[0].body instanceof uglify.AST_Assign);
+        assert(ast.body[0].body.left instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].body.left.is_array, false);
+        assert.equal(ast.body[0].body.operator, "=");
+        assert(ast.body[0].body.right instanceof uglify.AST_Object);
+    });
+
+    it("Parser should be able to handle nested destructuring", function() {
+        var ast = uglify.parse('[{a,b},[d, e, f, {g, h}]] = [{a: 1, b: 2}, [3, 4, 5, {g: 6, h: 7}]]');
+        assert(ast.body[0] instanceof uglify.AST_SimpleStatement);
+
+        assert(ast.body[0].body instanceof uglify.AST_Assign);
+        assert(ast.body[0].body.left instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].body.left.is_array, true);
+        assert.equal(ast.body[0].body.operator, "=");
+        assert(ast.body[0].body.right instanceof uglify.AST_Array);
+
+        assert(ast.body[0].body.left.names[0] instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].body.left.names[0].is_array, false);
+
+        assert(ast.body[0].body.left.names[1] instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].body.left.names[1].is_array, true);
+
+        assert(ast.body[0].body.left.names[1].names[3] instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].body.left.names[1].names[3].is_array, false);
+    });
+
+    it("Should handle spread operator in destructuring", function() {
+        var ast = uglify.parse("[a, b, ...c] = [1, 2, 3, 4, 5]");
+        assert(ast.body[0] instanceof uglify.AST_SimpleStatement);
+
+        assert(ast.body[0].body instanceof uglify.AST_Assign);
+        assert(ast.body[0].body.left instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].body.left.is_array, true);
+        assert.equal(ast.body[0].body.operator, "=");
+        assert(ast.body[0].body.right instanceof uglify.AST_Array);
+
+        assert(ast.body[0].body.left.names[0] instanceof uglify.AST_SymbolRef);
+        assert(ast.body[0].body.left.names[1] instanceof uglify.AST_SymbolRef);
+
+        assert(ast.body[0].body.left.names[2] instanceof uglify.AST_Expansion);
+    });
+
+    it("Should handle default assignments in destructuring", function() {
+        var ast = uglify.parse("({x: v, z = z + 5} = obj);");
+        assert(ast.body[0] instanceof uglify.AST_SimpleStatement);
+
+        assert(ast.body[0].body instanceof uglify.AST_Assign);
+        assert(ast.body[0].body.left instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].body.left.is_array, false);
+        assert.equal(ast.body[0].body.operator, "=");
+        assert(ast.body[0].body.right instanceof uglify.AST_SymbolRef);
+
+        assert(ast.body[0].body.left.names[0].value instanceof uglify.AST_SymbolRef);
+        assert.strictEqual(ast.body[0].body.left.names[0].start.value, "x");
+
+        assert(ast.body[0].body.left.names[1].value instanceof uglify.AST_DefaultAssign);
+        assert.strictEqual(ast.body[0].body.left.names[1].start.value, "z");
+        assert(ast.body[0].body.left.names[1].value.left instanceof uglify.AST_SymbolRef);
+        assert.strictEqual(ast.body[0].body.left.names[1].value.operator, "=");
+        assert(ast.body[0].body.left.names[1].value.right instanceof uglify.AST_Binary);
+
+
+        ast = uglify.parse("({x = 123} = obj);");
+        assert(ast.body[0] instanceof uglify.AST_SimpleStatement);
+        assert(ast.body[0].body instanceof uglify.AST_Assign);
+        assert(ast.body[0].body.left instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].body.left.is_array, false);
+        assert.equal(ast.body[0].body.operator, "=");
+        assert(ast.body[0].body.right instanceof uglify.AST_SymbolRef);
+
+        assert(ast.body[0].body.left.names[0].value instanceof uglify.AST_DefaultAssign);
+        assert.strictEqual(ast.body[0].body.left.names[0].value.operator, "=");
+        assert(ast.body[0].body.left.names[0].value.left instanceof uglify.AST_SymbolRef);
+
+
+        ast = uglify.parse("[x, y = 5] = foo");
+        assert(ast.body[0] instanceof uglify.AST_SimpleStatement);
+
+        assert(ast.body[0].body instanceof uglify.AST_Assign);
+        assert(ast.body[0].body.left instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].body.left.is_array, true);
+        assert.equal(ast.body[0].body.operator, "=");
+        assert(ast.body[0].body.right instanceof uglify.AST_SymbolRef);
+
+        assert(ast.body[0].body.left.names[0] instanceof uglify.AST_SymbolRef);
+        assert.strictEqual(ast.body[0].body.left.names[0].start.value, "x");
+
+        assert(ast.body[0].body.left.names[1] instanceof uglify.AST_DefaultAssign);
+        assert(ast.body[0].body.left.names[1].left instanceof uglify.AST_SymbolRef);
+        assert.strictEqual(ast.body[0].body.left.names[1].start.value, "y");
+    });
+
+    it("Should handle default assignments containing assignments in a destructuring", function() {
+        var ast = uglify.parse("[x, y = z = 2] = a;");
+        assert(ast.body[0] instanceof uglify.AST_SimpleStatement);
+
+        assert(ast.body[0].body instanceof uglify.AST_Assign);
+        assert(ast.body[0].body.left instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].body.left.is_array, true);
+        assert.equal(ast.body[0].body.operator, "=");
+        assert(ast.body[0].body.right instanceof uglify.AST_SymbolRef);
+
+        assert(ast.body[0].body.left.names[0] instanceof uglify.AST_SymbolRef);
+
+        assert(ast.body[0].body.left.names[1] instanceof uglify.AST_DefaultAssign);
+        assert(ast.body[0].body.left.names[1].left instanceof uglify.AST_SymbolRef);
+        assert.equal(ast.body[0].body.left.names[1].operator, "=");
+        assert(ast.body[0].body.left.names[1].right instanceof uglify.AST_Assign);
+
+        assert(ast.body[0].body.left.names[1].right.left instanceof uglify.AST_SymbolRef);
+        assert.equal(ast.body[0].body.left.names[1].right.operator, "=");
+        assert(ast.body[0].body.left.names[1].right.right instanceof uglify.AST_Number);
+
+        ast = uglify.parse("({a: a = 123} = obj)");
+        assert(ast.body[0] instanceof uglify.AST_SimpleStatement);
+
+        assert(ast.body[0].body instanceof uglify.AST_Assign);
+        assert(ast.body[0].body.left instanceof uglify.AST_Destructuring);
+        assert.strictEqual(ast.body[0].body.left.is_array, false);
+        assert.equal(ast.body[0].body.operator, "=");
+        assert(ast.body[0].body.right instanceof uglify.AST_SymbolRef);
+
+        assert(ast.body[0].body.left.names[0] instanceof uglify.AST_ObjectProperty);
+        assert.strictEqual(ast.body[0].body.left.names[0].key, "a");
+        assert(ast.body[0].body.left.names[0].value instanceof uglify.AST_DefaultAssign);
+        assert(ast.body[0].body.left.names[0].value.left instanceof uglify.AST_SymbolRef);
+        assert.strictEqual(ast.body[0].body.left.names[0].value.operator, "=");
+        assert(ast.body[0].body.left.names[0].value.right instanceof uglify.AST_Number);
+    });
+
+    it("Should allow multiple spread in array literals", function() {
+        var ast = uglify.parse("var a = [1, 2, 3], b = [4, 5, 6], joined; joined = [...a, ...b]");
+        assert(ast.body[0] instanceof uglify.AST_Var);
+        assert(ast.body[1] instanceof uglify.AST_SimpleStatement);
+
+        // Check statement containing array with spreads
+        assert(ast.body[1].body instanceof uglify.AST_Assign);
+        assert(ast.body[1].body.left instanceof uglify.AST_SymbolRef);
+        assert.equal(ast.body[1].body.operator, "=");
+        assert(ast.body[1].body.right instanceof uglify.AST_Array);
+
+        // Check array content
+        assert.strictEqual(ast.body[1].body.right.elements.length, 2);
+        assert(ast.body[1].body.right.elements[0] instanceof uglify.AST_Expansion);
+        assert(ast.body[1].body.right.elements[0].expression instanceof uglify.AST_SymbolRef);
+        assert(ast.body[1].body.right.elements[0].expression.name, "a");
+        assert(ast.body[1].body.right.elements[1] instanceof uglify.AST_Expansion);
+        assert(ast.body[1].body.right.elements[1].expression instanceof uglify.AST_SymbolRef);
+        assert(ast.body[1].body.right.elements[1].expression.name, "b");
+    });
+
+    it("Should not allow spread on invalid locations", function() {
+        var expect = function(input, expected) {
+            var execute = function(input) {
+                return function() {
+                    uglify.parse(input);
+                }
+            }
+            var check = function(e) {
+                return e instanceof uglify.JS_Parse_Error &&
+                    e.message === expected;
+            }
+
+            assert.throws(execute(input), check);
+        }
+
+        // Spreads are not allowed in destructuring array if it's not the last element
+        expect("[...a, ...b] = [1, 2, 3, 4]", "Spread must the be last element in destructuring array");
+
+        // Multiple spreads are not allowed in destructuring array
+        expect("[...a, ...b] = [1, 2, 3, 4]", "Spread must the be last element in destructuring array");
+
+        // Spread in obvious object pattern
+        expect("({...a} = foo)", "Unexpected token: expand (...)");
+
+        // Spread in block should not be allowed
+        expect("{...a} = foo", "Unexpected token: expand (...)");
+
+        // Not in standard yet
+        expect("let foo = {bar: 42}, bar; bar = {...foo}", "Unexpected token: expand (...)");
+    });
 });

test/mocha/line-endings.js

@@ -50,7 +50,7 @@ describe("line-endings", function() {
         }
         var fail = function(e) {
             return e instanceof Uglify.JS_Parse_Error &&
-                e.message === "SyntaxError: Unexpected line terminator";
+                e.message === "Unexpected line terminator";
         }
         for (var i = 0; i < inputs.length; i++) {
             assert.throws(test(inputs[i]), fail);

test/mocha/minify.js

@@ -1,5 +1,6 @@
 var Uglify = require('../../');
 var assert = require("assert");
+var readFileSync = require("fs").readFileSync;
 
 describe("minify", function() {
     it("Should test basic sanity of minify with default options", function() {
@@ -75,6 +76,51 @@ describe("minify", function() {
             assert.equal(map.sourcesContent[0],
                 'let foo = x => "foo " + x;\nconsole.log(foo("bar"));');
         });
+        it("Should process inline source map", function() {
+            var code = Uglify.minify("./test/input/issue-520/input.js", {
+                inSourceMap: "inline",
+                sourceMapInline: true
+            }).code + "\n";
+            assert.strictEqual(code, readFileSync("test/input/issue-520/output.js", "utf8"));
+        });
+        it("Should warn for missing inline source map", function() {
+            var warn_function = Uglify.AST_Node.warn_function;
+            var warnings = [];
+            Uglify.AST_Node.warn_function = function(txt) {
+                warnings.push(txt);
+            };
+            try {
+                var result = Uglify.minify("./test/input/issue-1323/sample.js", {
+                    inSourceMap: "inline",
+                    mangle: false,
+                });
+                assert.strictEqual(result.code, "var bar=function(){function foo(bar){return bar}return foo}();");
+                assert.strictEqual(warnings.length, 1);
+                assert.strictEqual(warnings[0], "inline source map not found");
+            } finally {
+                Uglify.AST_Node.warn_function = warn_function;
+            }
+        });
+        it("Should fail with multiple input and inline source map", function() {
+            assert.throws(function() {
+                Uglify.minify([
+                    "./test/input/issue-520/input.js",
+                    "./test/input/issue-520/output.js"
+                ], {
+                    inSourceMap: "inline",
+                    sourceMapInline: true
+                });
+            });
+        });
+        it("Should fail with SpiderMonkey and inline source map", function() {
+            assert.throws(function() {
+                Uglify.minify("./test/input/issue-520/input.js", {
+                    inSourceMap: "inline",
+                    sourceMapInline: true,
+                    spidermonkey: true
+                });
+            });
+        });
     });
 
     describe("sourceMapInline", function() {
@@ -95,4 +141,54 @@ describe("minify", function() {
             assert.strictEqual(code, "var a=function(n){return n};");
         });
     });
+
+    describe("#__PURE__", function() {
+        it("should drop #__PURE__ hint after use", function() {
+            var result = Uglify.minify('//@__PURE__ comment1 #__PURE__ comment2\n foo(), bar();', {
+                fromString: true,
+                output: {
+                    comments: "all",
+                    beautify: false,
+                }
+            });
+            var code = result.code;
+            assert.strictEqual(code, "//  comment1   comment2\nbar();");
+        });
+        it("should not drop #__PURE__ hint if function is retained", function() {
+            var result = Uglify.minify("var a = /*#__PURE__*/(function(){ foo(); })();", {
+                fromString: true,
+                output: {
+                    comments: "all",
+                    beautify: false,
+                }
+            });
+            var code = result.code;
+            assert.strictEqual(code, "var a=/*#__PURE__*/function(){foo()}();");
+        })
+    });
+
+    describe("JS_Parse_Error", function() {
+        it("should throw syntax error", function() {
+            assert.throws(function() {
+                Uglify.minify("function f(a{}", { fromString: true });
+            }, function(err) {
+                assert.ok(err instanceof Error);
+                assert.strictEqual(err.stack.split(/\n/)[0], "SyntaxError: Unexpected token punc «{», expected punc «,»");
+                assert.strictEqual(err.filename, 0);
+                assert.strictEqual(err.line, 1);
+                assert.strictEqual(err.col, 12);
+                return true;
+            });
+        });
+    });
+
+    describe("Compressor", function() {
+        it("should be backward compatible with ast.transform(compressor)", function() {
+            var ast = Uglify.parse("function f(a){for(var i=0;i<a;i++)console.log(i)}");
+            ast.figure_out_scope();
+            ast = ast.transform(Uglify.Compressor());
+            assert.strictEqual(ast.print_to_string(), "function f(a){for(var i=0;i<a;i++)console.log(i)}");
+        });
+    })
+
 });

test/mocha/new.js

@@ -89,7 +89,7 @@ describe("New", function() {
     it("Should check target in new.target", function() {
         assert.throws(function() {uglify.parse("new.blah")}, function(e) {
             return e instanceof uglify.JS_Parse_Error
-                && e.message === "SyntaxError: Unexpected token name «blah», expected name «target»";
+                && e.message === "Unexpected token name «blah», expected name «target»";
         });
     });
 });

test/mocha/number-literal.js

@@ -15,7 +15,7 @@ describe("Number literals", function () {
         }
         var error = function(e) {
             return e instanceof uglify.JS_Parse_Error &&
-                e.message === "SyntaxError: Legacy octal literals are not allowed in strict mode";
+                e.message === "Legacy octal literals are not allowed in strict mode";
         }
         for (var i = 0; i < inputs.length; i++) {
             assert.throws(test(inputs[i]), error, inputs[i]);

test/mocha/object.js

@@ -107,9 +107,9 @@ describe("Object", function() {
         var fail = function(data) {
             return function (e) {
                 return e instanceof Uglify.JS_Parse_Error && (
-                    e.message === "SyntaxError: Unexpected token: operator (" + data.operator + ")" ||
-                    (e.message === "SyntaxError: Unterminated regular expression" && data.operator[0] === "/") ||
-                    (e.message === "SyntaxError: Unexpected token: punc (()" && data.operator === "*")
+                    e.message === "Unexpected token: operator (" + data.operator + ")" ||
+                    (e.message === "Unterminated regular expression" && data.operator[0] === "/") ||
+                    (e.message === "Unexpected token: punc (()" && data.operator === "*")
                 );
             };
         };

test/mocha/operator.js

@@ -0,0 +1,489 @@
+var UglifyJS = require("../../");
+var assert = require("assert");
+
+describe("operator", function() {
+    it("Should handle mixing of ++/+/--/- correctly", function() {
+        function evaluate(exp) {
+            return new Function("var a=1,b=2,c=" + exp + ";return{a:a,b:b,c:c}")();
+        }
+
+        [ "", "+", "-" ].forEach(function(p) {
+            [ "++a", "--a", "a", "a--", "a++" ].forEach(function(a) {
+                [ "+", "-" ].forEach(function(o) {
+                    [ "", "+", "-" ].forEach(function(q) {
+                        [ "++b", "--b", "b", "b--", "b++" ].forEach(function(b) {
+                            var exp = [p, a, o, q, b].join(" ");
+                            var orig = evaluate(exp);
+                            var uglify = evaluate(UglifyJS.parse(exp).print_to_string());
+                            assert.strictEqual(orig.a, uglify.a);
+                            assert.strictEqual(orig.b, uglify.b);
+                            assert.strictEqual(orig.c, uglify.c);
+                            var beautify = evaluate(UglifyJS.parse(exp).print_to_string({
+                                beautify: true
+                            }));
+                            assert.strictEqual(orig.a, beautify.a);
+                            assert.strictEqual(orig.b, beautify.b);
+                            assert.strictEqual(orig.c, beautify.c);
+                        });
+                    });
+                });
+            });
+        });
+    });
+    it("Should remove extraneous spaces", function() {
+        [
+            [ "++a + ++b", "++a+ ++b" ],
+            [ "++a + --b", "++a+--b" ],
+            [ "++a + b", "++a+b" ],
+            [ "++a + b--", "++a+b--" ],
+            [ "++a + b++", "++a+b++" ],
+            [ "++a + + ++b", "++a+ + ++b" ],
+            [ "++a + + --b", "++a+ +--b" ],
+            [ "++a + + b", "++a+ +b" ],
+            [ "++a + + b--", "++a+ +b--" ],
+            [ "++a + + b++", "++a+ +b++" ],
+            [ "++a + - ++b", "++a+-++b" ],
+            [ "++a + - --b", "++a+- --b" ],
+            [ "++a + - b", "++a+-b" ],
+            [ "++a + - b--", "++a+-b--" ],
+            [ "++a + - b++", "++a+-b++" ],
+            [ "++a - ++b", "++a-++b" ],
+            [ "++a - --b", "++a- --b" ],
+            [ "++a - b", "++a-b" ],
+            [ "++a - b--", "++a-b--" ],
+            [ "++a - b++", "++a-b++" ],
+            [ "++a - + ++b", "++a-+ ++b" ],
+            [ "++a - + --b", "++a-+--b" ],
+            [ "++a - + b", "++a-+b" ],
+            [ "++a - + b--", "++a-+b--" ],
+            [ "++a - + b++", "++a-+b++" ],
+            [ "++a - - ++b", "++a- -++b" ],
+            [ "++a - - --b", "++a- - --b" ],
+            [ "++a - - b", "++a- -b" ],
+            [ "++a - - b--", "++a- -b--" ],
+            [ "++a - - b++", "++a- -b++" ],
+            [ "--a + ++b", "--a+ ++b" ],
+            [ "--a + --b", "--a+--b" ],
+            [ "--a + b", "--a+b" ],
+            [ "--a + b--", "--a+b--" ],
+            [ "--a + b++", "--a+b++" ],
+            [ "--a + + ++b", "--a+ + ++b" ],
+            [ "--a + + --b", "--a+ +--b" ],
+            [ "--a + + b", "--a+ +b" ],
+            [ "--a + + b--", "--a+ +b--" ],
+            [ "--a + + b++", "--a+ +b++" ],
+            [ "--a + - ++b", "--a+-++b" ],
+            [ "--a + - --b", "--a+- --b" ],
+            [ "--a + - b", "--a+-b" ],
+            [ "--a + - b--", "--a+-b--" ],
+            [ "--a + - b++", "--a+-b++" ],
+            [ "--a - ++b", "--a-++b" ],
+            [ "--a - --b", "--a- --b" ],
+            [ "--a - b", "--a-b" ],
+            [ "--a - b--", "--a-b--" ],
+            [ "--a - b++", "--a-b++" ],
+            [ "--a - + ++b", "--a-+ ++b" ],
+            [ "--a - + --b", "--a-+--b" ],
+            [ "--a - + b", "--a-+b" ],
+            [ "--a - + b--", "--a-+b--" ],
+            [ "--a - + b++", "--a-+b++" ],
+            [ "--a - - ++b", "--a- -++b" ],
+            [ "--a - - --b", "--a- - --b" ],
+            [ "--a - - b", "--a- -b" ],
+            [ "--a - - b--", "--a- -b--" ],
+            [ "--a - - b++", "--a- -b++" ],
+            [ "a + ++b", "a+ ++b" ],
+            [ "a + --b", "a+--b" ],
+            [ "a + b", "a+b" ],
+            [ "a + b--", "a+b--" ],
+            [ "a + b++", "a+b++" ],
+            [ "a + + ++b", "a+ + ++b" ],
+            [ "a + + --b", "a+ +--b" ],
+            [ "a + + b", "a+ +b" ],
+            [ "a + + b--", "a+ +b--" ],
+            [ "a + + b++", "a+ +b++" ],
+            [ "a + - ++b", "a+-++b" ],
+            [ "a + - --b", "a+- --b" ],
+            [ "a + - b", "a+-b" ],
+            [ "a + - b--", "a+-b--" ],
+            [ "a + - b++", "a+-b++" ],
+            [ "a - ++b", "a-++b" ],
+            [ "a - --b", "a- --b" ],
+            [ "a - b", "a-b" ],
+            [ "a - b--", "a-b--" ],
+            [ "a - b++", "a-b++" ],
+            [ "a - + ++b", "a-+ ++b" ],
+            [ "a - + --b", "a-+--b" ],
+            [ "a - + b", "a-+b" ],
+            [ "a - + b--", "a-+b--" ],
+            [ "a - + b++", "a-+b++" ],
+            [ "a - - ++b", "a- -++b" ],
+            [ "a - - --b", "a- - --b" ],
+            [ "a - - b", "a- -b" ],
+            [ "a - - b--", "a- -b--" ],
+            [ "a - - b++", "a- -b++" ],
+            [ "a-- + ++b", "a--+ ++b" ],
+            [ "a-- + --b", "a--+--b" ],
+            [ "a-- + b", "a--+b" ],
+            [ "a-- + b--", "a--+b--" ],
+            [ "a-- + b++", "a--+b++" ],
+            [ "a-- + + ++b", "a--+ + ++b" ],
+            [ "a-- + + --b", "a--+ +--b" ],
+            [ "a-- + + b", "a--+ +b" ],
+            [ "a-- + + b--", "a--+ +b--" ],
+            [ "a-- + + b++", "a--+ +b++" ],
+            [ "a-- + - ++b", "a--+-++b" ],
+            [ "a-- + - --b", "a--+- --b" ],
+            [ "a-- + - b", "a--+-b" ],
+            [ "a-- + - b--", "a--+-b--" ],
+            [ "a-- + - b++", "a--+-b++" ],
+            [ "a-- - ++b", "a---++b" ],
+            [ "a-- - --b", "a--- --b" ],
+            [ "a-- - b", "a---b" ],
+            [ "a-- - b--", "a---b--" ],
+            [ "a-- - b++", "a---b++" ],
+            [ "a-- - + ++b", "a---+ ++b" ],
+            [ "a-- - + --b", "a---+--b" ],
+            [ "a-- - + b", "a---+b" ],
+            [ "a-- - + b--", "a---+b--" ],
+            [ "a-- - + b++", "a---+b++" ],
+            [ "a-- - - ++b", "a--- -++b" ],
+            [ "a-- - - --b", "a--- - --b" ],
+            [ "a-- - - b", "a--- -b" ],
+            [ "a-- - - b--", "a--- -b--" ],
+            [ "a-- - - b++", "a--- -b++" ],
+            [ "a++ + ++b", "a+++ ++b" ],
+            [ "a++ + --b", "a+++--b" ],
+            [ "a++ + b", "a+++b" ],
+            [ "a++ + b--", "a+++b--" ],
+            [ "a++ + b++", "a+++b++" ],
+            [ "a++ + + ++b", "a+++ + ++b" ],
+            [ "a++ + + --b", "a+++ +--b" ],
+            [ "a++ + + b", "a+++ +b" ],
+            [ "a++ + + b--", "a+++ +b--" ],
+            [ "a++ + + b++", "a+++ +b++" ],
+            [ "a++ + - ++b", "a+++-++b" ],
+            [ "a++ + - --b", "a+++- --b" ],
+            [ "a++ + - b", "a+++-b" ],
+            [ "a++ + - b--", "a+++-b--" ],
+            [ "a++ + - b++", "a+++-b++" ],
+            [ "a++ - ++b", "a++-++b" ],
+            [ "a++ - --b", "a++- --b" ],
+            [ "a++ - b", "a++-b" ],
+            [ "a++ - b--", "a++-b--" ],
+            [ "a++ - b++", "a++-b++" ],
+            [ "a++ - + ++b", "a++-+ ++b" ],
+            [ "a++ - + --b", "a++-+--b" ],
+            [ "a++ - + b", "a++-+b" ],
+            [ "a++ - + b--", "a++-+b--" ],
+            [ "a++ - + b++", "a++-+b++" ],
+            [ "a++ - - ++b", "a++- -++b" ],
+            [ "a++ - - --b", "a++- - --b" ],
+            [ "a++ - - b", "a++- -b" ],
+            [ "a++ - - b--", "a++- -b--" ],
+            [ "a++ - - b++", "a++- -b++" ],
+            [ "+ ++a + ++b", "+ ++a+ ++b" ],
+            [ "+ ++a + --b", "+ ++a+--b" ],
+            [ "+ ++a + b", "+ ++a+b" ],
+            [ "+ ++a + b--", "+ ++a+b--" ],
+            [ "+ ++a + b++", "+ ++a+b++" ],
+            [ "+ ++a + + ++b", "+ ++a+ + ++b" ],
+            [ "+ ++a + + --b", "+ ++a+ +--b" ],
+            [ "+ ++a + + b", "+ ++a+ +b" ],
+            [ "+ ++a + + b--", "+ ++a+ +b--" ],
+            [ "+ ++a + + b++", "+ ++a+ +b++" ],
+            [ "+ ++a + - ++b", "+ ++a+-++b" ],
+            [ "+ ++a + - --b", "+ ++a+- --b" ],
+            [ "+ ++a + - b", "+ ++a+-b" ],
+            [ "+ ++a + - b--", "+ ++a+-b--" ],
+            [ "+ ++a + - b++", "+ ++a+-b++" ],
+            [ "+ ++a - ++b", "+ ++a-++b" ],
+            [ "+ ++a - --b", "+ ++a- --b" ],
+            [ "+ ++a - b", "+ ++a-b" ],
+            [ "+ ++a - b--", "+ ++a-b--" ],
+            [ "+ ++a - b++", "+ ++a-b++" ],
+            [ "+ ++a - + ++b", "+ ++a-+ ++b" ],
+            [ "+ ++a - + --b", "+ ++a-+--b" ],
+            [ "+ ++a - + b", "+ ++a-+b" ],
+            [ "+ ++a - + b--", "+ ++a-+b--" ],
+            [ "+ ++a - + b++", "+ ++a-+b++" ],
+            [ "+ ++a - - ++b", "+ ++a- -++b" ],
+            [ "+ ++a - - --b", "+ ++a- - --b" ],
+            [ "+ ++a - - b", "+ ++a- -b" ],
+            [ "+ ++a - - b--", "+ ++a- -b--" ],
+            [ "+ ++a - - b++", "+ ++a- -b++" ],
+            [ "+ --a + ++b", "+--a+ ++b" ],
+            [ "+ --a + --b", "+--a+--b" ],
+            [ "+ --a + b", "+--a+b" ],
+            [ "+ --a + b--", "+--a+b--" ],
+            [ "+ --a + b++", "+--a+b++" ],
+            [ "+ --a + + ++b", "+--a+ + ++b" ],
+            [ "+ --a + + --b", "+--a+ +--b" ],
+            [ "+ --a + + b", "+--a+ +b" ],
+            [ "+ --a + + b--", "+--a+ +b--" ],
+            [ "+ --a + + b++", "+--a+ +b++" ],
+            [ "+ --a + - ++b", "+--a+-++b" ],
+            [ "+ --a + - --b", "+--a+- --b" ],
+            [ "+ --a + - b", "+--a+-b" ],
+            [ "+ --a + - b--", "+--a+-b--" ],
+            [ "+ --a + - b++", "+--a+-b++" ],
+            [ "+ --a - ++b", "+--a-++b" ],
+            [ "+ --a - --b", "+--a- --b" ],
+            [ "+ --a - b", "+--a-b" ],
+            [ "+ --a - b--", "+--a-b--" ],
+            [ "+ --a - b++", "+--a-b++" ],
+            [ "+ --a - + ++b", "+--a-+ ++b" ],
+            [ "+ --a - + --b", "+--a-+--b" ],
+            [ "+ --a - + b", "+--a-+b" ],
+            [ "+ --a - + b--", "+--a-+b--" ],
+            [ "+ --a - + b++", "+--a-+b++" ],
+            [ "+ --a - - ++b", "+--a- -++b" ],
+            [ "+ --a - - --b", "+--a- - --b" ],
+            [ "+ --a - - b", "+--a- -b" ],
+            [ "+ --a - - b--", "+--a- -b--" ],
+            [ "+ --a - - b++", "+--a- -b++" ],
+            [ "+ a + ++b", "+a+ ++b" ],
+            [ "+ a + --b", "+a+--b" ],
+            [ "+ a + b", "+a+b" ],
+            [ "+ a + b--", "+a+b--" ],
+            [ "+ a + b++", "+a+b++" ],
+            [ "+ a + + ++b", "+a+ + ++b" ],
+            [ "+ a + + --b", "+a+ +--b" ],
+            [ "+ a + + b", "+a+ +b" ],
+            [ "+ a + + b--", "+a+ +b--" ],
+            [ "+ a + + b++", "+a+ +b++" ],
+            [ "+ a + - ++b", "+a+-++b" ],
+            [ "+ a + - --b", "+a+- --b" ],
+            [ "+ a + - b", "+a+-b" ],
+            [ "+ a + - b--", "+a+-b--" ],
+            [ "+ a + - b++", "+a+-b++" ],
+            [ "+ a - ++b", "+a-++b" ],
+            [ "+ a - --b", "+a- --b" ],
+            [ "+ a - b", "+a-b" ],
+            [ "+ a - b--", "+a-b--" ],
+            [ "+ a - b++", "+a-b++" ],
+            [ "+ a - + ++b", "+a-+ ++b" ],
+            [ "+ a - + --b", "+a-+--b" ],
+            [ "+ a - + b", "+a-+b" ],
+            [ "+ a - + b--", "+a-+b--" ],
+            [ "+ a - + b++", "+a-+b++" ],
+            [ "+ a - - ++b", "+a- -++b" ],
+            [ "+ a - - --b", "+a- - --b" ],
+            [ "+ a - - b", "+a- -b" ],
+            [ "+ a - - b--", "+a- -b--" ],
+            [ "+ a - - b++", "+a- -b++" ],
+            [ "+ a-- + ++b", "+a--+ ++b" ],
+            [ "+ a-- + --b", "+a--+--b" ],
+            [ "+ a-- + b", "+a--+b" ],
+            [ "+ a-- + b--", "+a--+b--" ],
+            [ "+ a-- + b++", "+a--+b++" ],
+            [ "+ a-- + + ++b", "+a--+ + ++b" ],
+            [ "+ a-- + + --b", "+a--+ +--b" ],
+            [ "+ a-- + + b", "+a--+ +b" ],
+            [ "+ a-- + + b--", "+a--+ +b--" ],
+            [ "+ a-- + + b++", "+a--+ +b++" ],
+            [ "+ a-- + - ++b", "+a--+-++b" ],
+            [ "+ a-- + - --b", "+a--+- --b" ],
+            [ "+ a-- + - b", "+a--+-b" ],
+            [ "+ a-- + - b--", "+a--+-b--" ],
+            [ "+ a-- + - b++", "+a--+-b++" ],
+            [ "+ a-- - ++b", "+a---++b" ],
+            [ "+ a-- - --b", "+a--- --b" ],
+            [ "+ a-- - b", "+a---b" ],
+            [ "+ a-- - b--", "+a---b--" ],
+            [ "+ a-- - b++", "+a---b++" ],
+            [ "+ a-- - + ++b", "+a---+ ++b" ],
+            [ "+ a-- - + --b", "+a---+--b" ],
+            [ "+ a-- - + b", "+a---+b" ],
+            [ "+ a-- - + b--", "+a---+b--" ],
+            [ "+ a-- - + b++", "+a---+b++" ],
+            [ "+ a-- - - ++b", "+a--- -++b" ],
+            [ "+ a-- - - --b", "+a--- - --b" ],
+            [ "+ a-- - - b", "+a--- -b" ],
+            [ "+ a-- - - b--", "+a--- -b--" ],
+            [ "+ a-- - - b++", "+a--- -b++" ],
+            [ "+ a++ + ++b", "+a+++ ++b" ],
+            [ "+ a++ + --b", "+a+++--b" ],
+            [ "+ a++ + b", "+a+++b" ],
+            [ "+ a++ + b--", "+a+++b--" ],
+            [ "+ a++ + b++", "+a+++b++" ],
+            [ "+ a++ + + ++b", "+a+++ + ++b" ],
+            [ "+ a++ + + --b", "+a+++ +--b" ],
+            [ "+ a++ + + b", "+a+++ +b" ],
+            [ "+ a++ + + b--", "+a+++ +b--" ],
+            [ "+ a++ + + b++", "+a+++ +b++" ],
+            [ "+ a++ + - ++b", "+a+++-++b" ],
+            [ "+ a++ + - --b", "+a+++- --b" ],
+            [ "+ a++ + - b", "+a+++-b" ],
+            [ "+ a++ + - b--", "+a+++-b--" ],
+            [ "+ a++ + - b++", "+a+++-b++" ],
+            [ "+ a++ - ++b", "+a++-++b" ],
+            [ "+ a++ - --b", "+a++- --b" ],
+            [ "+ a++ - b", "+a++-b" ],
+            [ "+ a++ - b--", "+a++-b--" ],
+            [ "+ a++ - b++", "+a++-b++" ],
+            [ "+ a++ - + ++b", "+a++-+ ++b" ],
+            [ "+ a++ - + --b", "+a++-+--b" ],
+            [ "+ a++ - + b", "+a++-+b" ],
+            [ "+ a++ - + b--", "+a++-+b--" ],
+            [ "+ a++ - + b++", "+a++-+b++" ],
+            [ "+ a++ - - ++b", "+a++- -++b" ],
+            [ "+ a++ - - --b", "+a++- - --b" ],
+            [ "+ a++ - - b", "+a++- -b" ],
+            [ "+ a++ - - b--", "+a++- -b--" ],
+            [ "+ a++ - - b++", "+a++- -b++" ],
+            [ "- ++a + ++b", "-++a+ ++b" ],
+            [ "- ++a + --b", "-++a+--b" ],
+            [ "- ++a + b", "-++a+b" ],
+            [ "- ++a + b--", "-++a+b--" ],
+            [ "- ++a + b++", "-++a+b++" ],
+            [ "- ++a + + ++b", "-++a+ + ++b" ],
+            [ "- ++a + + --b", "-++a+ +--b" ],
+            [ "- ++a + + b", "-++a+ +b" ],
+            [ "- ++a + + b--", "-++a+ +b--" ],
+            [ "- ++a + + b++", "-++a+ +b++" ],
+            [ "- ++a + - ++b", "-++a+-++b" ],
+            [ "- ++a + - --b", "-++a+- --b" ],
+            [ "- ++a + - b", "-++a+-b" ],
+            [ "- ++a + - b--", "-++a+-b--" ],
+            [ "- ++a + - b++", "-++a+-b++" ],
+            [ "- ++a - ++b", "-++a-++b" ],
+            [ "- ++a - --b", "-++a- --b" ],
+            [ "- ++a - b", "-++a-b" ],
+            [ "- ++a - b--", "-++a-b--" ],
+            [ "- ++a - b++", "-++a-b++" ],
+            [ "- ++a - + ++b", "-++a-+ ++b" ],
+            [ "- ++a - + --b", "-++a-+--b" ],
+            [ "- ++a - + b", "-++a-+b" ],
+            [ "- ++a - + b--", "-++a-+b--" ],
+            [ "- ++a - + b++", "-++a-+b++" ],
+            [ "- ++a - - ++b", "-++a- -++b" ],
+            [ "- ++a - - --b", "-++a- - --b" ],
+            [ "- ++a - - b", "-++a- -b" ],
+            [ "- ++a - - b--", "-++a- -b--" ],
+            [ "- ++a - - b++", "-++a- -b++" ],
+            [ "- --a + ++b", "- --a+ ++b" ],
+            [ "- --a + --b", "- --a+--b" ],
+            [ "- --a + b", "- --a+b" ],
+            [ "- --a + b--", "- --a+b--" ],
+            [ "- --a + b++", "- --a+b++" ],
+            [ "- --a + + ++b", "- --a+ + ++b" ],
+            [ "- --a + + --b", "- --a+ +--b" ],
+            [ "- --a + + b", "- --a+ +b" ],
+            [ "- --a + + b--", "- --a+ +b--" ],
+            [ "- --a + + b++", "- --a+ +b++" ],
+            [ "- --a + - ++b", "- --a+-++b" ],
+            [ "- --a + - --b", "- --a+- --b" ],
+            [ "- --a + - b", "- --a+-b" ],
+            [ "- --a + - b--", "- --a+-b--" ],
+            [ "- --a + - b++", "- --a+-b++" ],
+            [ "- --a - ++b", "- --a-++b" ],
+            [ "- --a - --b", "- --a- --b" ],
+            [ "- --a - b", "- --a-b" ],
+            [ "- --a - b--", "- --a-b--" ],
+            [ "- --a - b++", "- --a-b++" ],
+            [ "- --a - + ++b", "- --a-+ ++b" ],
+            [ "- --a - + --b", "- --a-+--b" ],
+            [ "- --a - + b", "- --a-+b" ],
+            [ "- --a - + b--", "- --a-+b--" ],
+            [ "- --a - + b++", "- --a-+b++" ],
+            [ "- --a - - ++b", "- --a- -++b" ],
+            [ "- --a - - --b", "- --a- - --b" ],
+            [ "- --a - - b", "- --a- -b" ],
+            [ "- --a - - b--", "- --a- -b--" ],
+            [ "- --a - - b++", "- --a- -b++" ],
+            [ "- a + ++b", "-a+ ++b" ],
+            [ "- a + --b", "-a+--b" ],
+            [ "- a + b", "-a+b" ],
+            [ "- a + b--", "-a+b--" ],
+            [ "- a + b++", "-a+b++" ],
+            [ "- a + + ++b", "-a+ + ++b" ],
+            [ "- a + + --b", "-a+ +--b" ],
+            [ "- a + + b", "-a+ +b" ],
+            [ "- a + + b--", "-a+ +b--" ],
+            [ "- a + + b++", "-a+ +b++" ],
+            [ "- a + - ++b", "-a+-++b" ],
+            [ "- a + - --b", "-a+- --b" ],
+            [ "- a + - b", "-a+-b" ],
+            [ "- a + - b--", "-a+-b--" ],
+            [ "- a + - b++", "-a+-b++" ],
+            [ "- a - ++b", "-a-++b" ],
+            [ "- a - --b", "-a- --b" ],
+            [ "- a - b", "-a-b" ],
+            [ "- a - b--", "-a-b--" ],
+            [ "- a - b++", "-a-b++" ],
+            [ "- a - + ++b", "-a-+ ++b" ],
+            [ "- a - + --b", "-a-+--b" ],
+            [ "- a - + b", "-a-+b" ],
+            [ "- a - + b--", "-a-+b--" ],
+            [ "- a - + b++", "-a-+b++" ],
+            [ "- a - - ++b", "-a- -++b" ],
+            [ "- a - - --b", "-a- - --b" ],
+            [ "- a - - b", "-a- -b" ],
+            [ "- a - - b--", "-a- -b--" ],
+            [ "- a - - b++", "-a- -b++" ],
+            [ "- a-- + ++b", "-a--+ ++b" ],
+            [ "- a-- + --b", "-a--+--b" ],
+            [ "- a-- + b", "-a--+b" ],
+            [ "- a-- + b--", "-a--+b--" ],
+            [ "- a-- + b++", "-a--+b++" ],
+            [ "- a-- + + ++b", "-a--+ + ++b" ],
+            [ "- a-- + + --b", "-a--+ +--b" ],
+            [ "- a-- + + b", "-a--+ +b" ],
+            [ "- a-- + + b--", "-a--+ +b--" ],
+            [ "- a-- + + b++", "-a--+ +b++" ],
+            [ "- a-- + - ++b", "-a--+-++b" ],
+            [ "- a-- + - --b", "-a--+- --b" ],
+            [ "- a-- + - b", "-a--+-b" ],
+            [ "- a-- + - b--", "-a--+-b--" ],
+            [ "- a-- + - b++", "-a--+-b++" ],
+            [ "- a-- - ++b", "-a---++b" ],
+            [ "- a-- - --b", "-a--- --b" ],
+            [ "- a-- - b", "-a---b" ],
+            [ "- a-- - b--", "-a---b--" ],
+            [ "- a-- - b++", "-a---b++" ],
+            [ "- a-- - + ++b", "-a---+ ++b" ],
+            [ "- a-- - + --b", "-a---+--b" ],
+            [ "- a-- - + b", "-a---+b" ],
+            [ "- a-- - + b--", "-a---+b--" ],
+            [ "- a-- - + b++", "-a---+b++" ],
+            [ "- a-- - - ++b", "-a--- -++b" ],
+            [ "- a-- - - --b", "-a--- - --b" ],
+            [ "- a-- - - b", "-a--- -b" ],
+            [ "- a-- - - b--", "-a--- -b--" ],
+            [ "- a-- - - b++", "-a--- -b++" ],
+            [ "- a++ + ++b", "-a+++ ++b" ],
+            [ "- a++ + --b", "-a+++--b" ],
+            [ "- a++ + b", "-a+++b" ],
+            [ "- a++ + b--", "-a+++b--" ],
+            [ "- a++ + b++", "-a+++b++" ],
+            [ "- a++ + + ++b", "-a+++ + ++b" ],
+            [ "- a++ + + --b", "-a+++ +--b" ],
+            [ "- a++ + + b", "-a+++ +b" ],
+            [ "- a++ + + b--", "-a+++ +b--" ],
+            [ "- a++ + + b++", "-a+++ +b++" ],
+            [ "- a++ + - ++b", "-a+++-++b" ],
+            [ "- a++ + - --b", "-a+++- --b" ],
+            [ "- a++ + - b", "-a+++-b" ],
+            [ "- a++ + - b--", "-a+++-b--" ],
+            [ "- a++ + - b++", "-a+++-b++" ],
+            [ "- a++ - ++b", "-a++-++b" ],
+            [ "- a++ - --b", "-a++- --b" ],
+            [ "- a++ - b", "-a++-b" ],
+            [ "- a++ - b--", "-a++-b--" ],
+            [ "- a++ - b++", "-a++-b++" ],
+            [ "- a++ - + ++b", "-a++-+ ++b" ],
+            [ "- a++ - + --b", "-a++-+--b" ],
+            [ "- a++ - + b", "-a++-+b" ],
+            [ "- a++ - + b--", "-a++-+b--" ],
+            [ "- a++ - + b++", "-a++-+b++" ],
+            [ "- a++ - - ++b", "-a++- -++b" ],
+            [ "- a++ - - --b", "-a++- - --b" ],
+            [ "- a++ - - b", "-a++- -b" ],
+            [ "- a++ - - b--", "-a++- -b--" ],
+            [ "- a++ - - b++", "-a++- -b++" ],
+        ].forEach(function(exp) {
+            assert.strictEqual(UglifyJS.parse(exp[0]).print_to_string(), exp[1] + ";");
+        });
+    });
+});

test/mocha/release.js

@@ -0,0 +1,54 @@
+var assert = require("assert");
+var spawn = require("child_process").spawn;
+
+if (!process.env.UGLIFYJS_TEST_ALL) return;
+
+function run(command, args, done) {
+    var id = setInterval(function() {
+        process.stdout.write("\0");
+    }, 5 * 60 * 1000);
+    spawn(command, args, {
+        stdio: "ignore"
+    }).on("exit", function(code) {
+        clearInterval(id);
+        assert.strictEqual(code, 0);
+        done();
+    });
+}
+
+describe("test/benchmark.js", function() {
+    this.timeout(5 * 60 * 1000);
+    [
+        "-b",
+        "-b bracketize",
+        "-m",
+        "-mc passes=3",
+        "-mc passes=3,toplevel",
+        "-mc passes=3,unsafe",
+        "-mc keep_fargs=false,passes=3",
+        "-mc keep_fargs=false,passes=3,pure_getters,unsafe,unsafe_comps,unsafe_math,unsafe_proto",
+    ].forEach(function(options) {
+        it("Should pass with options " + options, function(done) {
+            var args = options.split(/ /);
+            args.unshift("test/benchmark.js");
+            run(process.argv[0], args, done);
+        });
+    });
+});
+
+describe("test/jetstream.js", function() {
+    this.timeout(20 * 60 * 1000);
+    it("Should install phantomjs-prebuilt", function(done) {
+        run("npm", ["install", "phantomjs-prebuilt@2.1.14"], done);
+    });
+    [
+        "-mc warnings=false",
+        "-mc keep_fargs=false,passes=3,pure_getters,unsafe,unsafe_comps,unsafe_math,unsafe_proto,warnings=false",
+    ].forEach(function(options) {
+        it("Should pass with options " + options, function(done) {
+            var args = options.split(/ /);
+            args.unshift("test/jetstream.js");
+            run(process.argv[0], args, done);
+        });
+    });
+});

test/mocha/string-literal.js

@@ -19,7 +19,7 @@ describe("String literals", function() {
 
         var error = function(e) {
             return e instanceof UglifyJS.JS_Parse_Error &&
-                e.message === "SyntaxError: Unterminated string constant";
+                e.message === "Unterminated string constant";
         };
 
         for (var input in inputs) {
@@ -49,7 +49,7 @@ describe("String literals", function() {
 
         var error = function(e) {
             return e instanceof UglifyJS.JS_Parse_Error &&
-                e.message === "SyntaxError: Legacy octal escape sequences are not allowed in strict mode";
+                e.message === "Legacy octal escape sequences are not allowed in strict mode";
         }
 
         for (var input in inputs) {

test/mocha/template-string.js

@@ -23,7 +23,7 @@ describe("Template string", function() {
 
         var fail = function(e) {
             return e instanceof uglify.JS_Parse_Error
-                && /^SyntaxError: Unexpected token: /.test(e.message);
+                && /^Unexpected token: /.test(e.message);
         };
 
         for (var i = 0; i < tests.length; i++) {