Merge branch 'master' into harmony

Also add .gitattributes to checkout lf eol style

README.md

@@ -10,9 +10,6 @@ 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
 -------
 
@@ -70,13 +67,10 @@ 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 6/7/8.
+                                Internet Explorer 6-8 quirks.
                                 By default UglifyJS will not try to be IE-proof.
-  --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.
-                                Note: `--support-ie8` may generate incorrect code
-                                for `try`/`catch` in ES5 compliant browsers.
+  --support-ie8                 Use this flag to support Internet Explorer 6-8 quirks.
+                                Note: may break standards compliant `catch` identifiers.
   --expr                        Parse a single expression, rather than a
                                 program (for parsing JSON)
   -p, --prefix                  Skip prefix for original filenames that appear
@@ -90,9 +84,10 @@ 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, e.g.
-                                `-c 'if_return=false,pure_funcs=["Math.pow","console.log"]'`
-                                Use `-c` with no argument to enable default compression
+  -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
                                 options.
   -d, --define                  Global definitions
   -e, --enclose                 Embed everything in a big function, with a
@@ -153,10 +148,8 @@ 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                  Functions that can be safely removed if their
-                                return value is not used, e.g.
-                                `--pure-funcs Math.floor console.info`
-                                (requires `--compress`)
+  --pure-funcs                  List of functions that can be safely removed if
+                                their return value is not used           [array]
 ```
 
 Specify `--output` (`-o`) to declare the output file.  Otherwise the output
@@ -292,17 +285,6 @@ 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
@@ -350,9 +332,6 @@ 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_proto` (default: false) -- optimize expressions like
-  `Array.prototype.slice.call(a)` into `[].slice.call(a)`
-
 - `conditionals` -- apply optimizations for `if`-s and conditional
   expressions
 
@@ -368,15 +347,7 @@ 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 (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`)
+- `unused` -- drop unreferenced functions and variables
 
 - `hoist_funs` -- hoist function declarations
 
@@ -419,9 +390,7 @@ 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. 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.
+  `console.*` functions.
 
 - `keep_fargs` -- default `true`.  Prevents the
   compressor from discarding unused function arguments.  You need this
@@ -463,8 +432,6 @@ 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.
@@ -475,6 +442,8 @@ 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.
 ```
 
@@ -485,8 +454,7 @@ 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 which does not support `const`,
-using `var` with `reduce_vars` (enabled by default) should suffice.
+them. If you are targeting < ES6 environments, use `/** @const */ var`.
 
 <a name="codegen-options"></a>
 
@@ -550,6 +518,9 @@ can pass additional arguments that control the code output:
   - `3` -- always use the original quotes
 - `keep_quoted_props` (default `false`) -- when turned on, prevents stripping
   quotes from property names in object literals.
+- `ecma` (default `5`) -- set output printing mode.  This will only change the
+  output in direct control of the beautifier.  Non-compatible features in the
+  abstract syntax tree will still be outputted as is.
 
 ### Keeping copyright notices or other comments
 
@@ -621,7 +592,7 @@ function uglify(ast, options, mangle) {
 
   // Compression
   uAST.figure_out_scope();
-  uAST = UglifyJS.Compressor(options).compress(uAST);
+  uAST = uAST.transform(UglifyJS.Compressor(options));
 
   // Mangling (optional)
   if (mangle) {
@@ -865,7 +836,7 @@ toplevel.figure_out_scope()
 Like this:
 ```javascript
 var compressor = UglifyJS.Compressor(options);
-var compressed_ast = compressor.compress(toplevel);
+var compressed_ast = toplevel.transform(compressor);
 ```
 
 The `options` can be missing.  Available options are discussed above in
@@ -969,20 +940,3 @@ 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

@@ -26,8 +26,8 @@ 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 6/7/8. This flag is enabled by default.")
-    .describe("support-ie8", "Support non-standard Internet Explorer 6/7/8 javascript. Note: may generate incorrect code for try/catch in ES5 compliant browsers.")
+    .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("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. \
@@ -228,10 +228,9 @@ if (ARGS.mangle_props === true) {
 }
 
 var OUTPUT_OPTIONS = {
-    beautify     : BEAUTIFY ? true : false,
-    max_line_len : 32000,
-    preamble     : ARGS.preamble || null,
-    quote_style  : ARGS.quotes != null ? ARGS.quotes : 0,
+    beautify    : BEAUTIFY ? true : false,
+    preamble    : ARGS.preamble || null,
+    quote_style : ARGS.quotes != null ? ARGS.quotes : 0
 };
 
 if (ARGS.mangle_props == 2) {
@@ -282,29 +281,21 @@ if (ARGS.self) {
 
 var ORIG_MAP = ARGS.in_source_map;
 
-if (ORIG_MAP && ORIG_MAP != "inline") {
+if (ORIG_MAP) {
     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);
@@ -316,19 +307,37 @@ 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 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) {
     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, '/');
@@ -364,21 +373,7 @@ 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);
-                        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.message);
                         print_error(ex.stack);
                         process.exit(1);
                     }
@@ -389,28 +384,6 @@ async.eachLimit(files, 1, function (file, cb) {
         cb();
     });
 }, function () {
-    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);
     });
@@ -455,11 +428,10 @@ 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(MANGLE || { screw_ie8: screw_ie8, cache: TL_CACHE });
+            TOPLEVEL.figure_out_scope({ screw_ie8: screw_ie8, cache: TL_CACHE });
             if (ARGS.lint) {
                 TOPLEVEL.scope_warnings();
             }
@@ -474,7 +446,7 @@ async.eachLimit(files, 1, function (file, cb) {
 
     if (SCOPE_IS_NEEDED) {
         time_it("scope", function(){
-            TOPLEVEL.figure_out_scope(MANGLE || { screw_ie8: screw_ie8, cache: TL_CACHE });
+            TOPLEVEL.figure_out_scope({ screw_ie8: screw_ie8, cache: TL_CACHE });
             if (MANGLE && !TL_CACHE) {
                 TOPLEVEL.compute_char_frequency(MANGLE);
             }
@@ -482,6 +454,7 @@ async.eachLimit(files, 1, function (file, cb) {
     }
 
     if (MANGLE) time_it("mangle", function(){
+        MANGLE.cache = TL_CACHE;
         TOPLEVEL.mangle_names(MANGLE);
     });
 
@@ -567,7 +540,7 @@ 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().replace(/-/g, "_");
+                var name = node.left.print_to_string({ beautify: false }).replace(/-/g, "_");
                 var value = node.right;
                 if (constants)
                     value = new Function("return (" + value.print_to_string() + ")")();
@@ -575,7 +548,7 @@ 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().replace(/-/g, "_");
+                var name = node.print_to_string({ beautify: false }).replace(/-/g, "_");
                 ret[name] = true;
                 return true;    // no descend
             }
@@ -602,15 +575,6 @@ 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

@@ -81,9 +81,7 @@ function DEFNODE(type, props, methods, base) {
     ctor.DEFMETHOD = function(name, method) {
         this.prototype[name] = method;
     };
-    if (typeof exports !== "undefined") {
-        exports["AST_" + type] = ctor;
-    }
+    exports["AST_" + type] = ctor;
     return ctor;
 };
 
@@ -145,13 +143,12 @@ var AST_SimpleStatement = DEFNODE("SimpleStatement", "body", {
 }, AST_Statement);
 
 function walk_body(node, visitor) {
-    var body = node.body;
-    if (body instanceof AST_Statement) {
-        body._walk(visitor);
-    }
-    else for (var i = 0, len = body.length; i < len; i++) {
-        body[i]._walk(visitor);
+    if (node.body instanceof AST_Node) {
+        node.body._walk(visitor);
     }
+    else node.body.forEach(function(stat){
+        stat._walk(visitor);
+    });
 };
 
 var AST_Block = DEFNODE("Block", "body", {
@@ -266,6 +263,10 @@ var AST_ForIn = DEFNODE("ForIn", "init name object", {
     }
 }, AST_IterationStatement);
 
+var AST_ForOf = DEFNODE("ForOf", null, {
+    $documentation: "A `for ... of` statement",
+}, AST_ForIn);
+
 var AST_With = DEFNODE("With", "expression", {
     $documentation: "A `with` statement",
     $propdoc: {
@@ -293,6 +294,13 @@ var AST_Scope = DEFNODE("Scope", "directives variables functions uses_with uses_
         enclosed: "[SymbolDef*/S] a list of all symbol definitions that are accessed from this scope or any subscopes",
         cname: "[integer/S] current index for mangling variables (used internally by the mangler)",
     },
+    get_defun_scope: function () {
+        var self = this;
+        while (self.is_block_scope() && self.parent_scope) {
+            self = self.parent_scope;
+        }
+        return self;
+    }
 }, AST_Block);
 
 var AST_Toplevel = DEFNODE("Toplevel", "globals", {
@@ -362,20 +370,103 @@ var AST_Toplevel = DEFNODE("Toplevel", "globals", {
     }
 }, AST_Scope);
 
-var AST_Lambda = DEFNODE("Lambda", "name argnames uses_arguments", {
+var AST_Expansion = DEFNODE("Expansion", "expression", {
+    $documentation: "An expandible argument, such as ...rest, a splat, such as [1,2,...all], or an expansion in a variable declaration, such as var [first, ...rest] = list",
+    $propdoc: {
+        expression: "AST_Symbol the thing to be expanded"
+    },
+    _walk: function(visitor) {
+        var self = this;
+        return visitor._visit(this, function(){
+            self.expression.walk(visitor);
+        });
+    }
+});
+
+var AST_ArrowParametersOrSeq = DEFNODE("ArrowParametersOrSeq", "expressions", {
+    $documentation: "A set of arrow function parameters or a sequence expression. This is used because when the parser sees a \"(\" it could be the start of a seq, or the start of a parameter list of an arrow function.",
+    $propdoc: {
+        expressions: "[AST_Expression|AST_Destructuring|AST_Expansion*] array of expressions or argument names or destructurings."
+    },
+    as_params: function (croak) {
+        // We don't want anything which doesn't belong in a destructuring
+        var root = this;
+        return this.expressions.map(function to_fun_args(ex, _, __, default_seen_above) {
+            if (ex instanceof AST_Object) {
+                return new AST_Destructuring({
+                    start: ex.start,
+                    end: ex.end,
+                    is_array: false,
+                    default: default_seen_above,
+                    names: ex.properties.map(to_fun_args)
+                });
+            } 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.value = to_fun_args(ex.value, 0, [ex.key], ex.default);
+                return ex;
+            } 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;
+            } else if (ex instanceof AST_SymbolRef) {
+                return new AST_SymbolFunarg({
+                    name: ex.name,
+                    default: default_seen_above,
+                    start: ex.start,
+                    end: ex.end
+                });
+            } else if (ex instanceof AST_Expansion) {
+                return ex;
+            } else if (ex instanceof AST_Array) {
+                return new AST_Destructuring({
+                    start: ex.start,
+                    end: ex.end,
+                    is_array: true,
+                    default: default_seen_above,
+                    names: ex.elements.map(to_fun_args)
+                });
+            } else if (ex instanceof AST_Assign) {
+                return to_fun_args(ex.left, undefined, undefined, ex.right);
+            } else {
+                croak("Invalid function parameter", ex.start.line, ex.start.col);
+            }
+        });
+    },
+    as_expr: function (croak) {
+        return AST_Seq.from_array(this.expressions);
+    }
+});
+
+var AST_Lambda = DEFNODE("Lambda", "name argnames uses_arguments is_generator", {
     $documentation: "Base class for functions",
     $propdoc: {
+        is_generator: "[boolean] is generatorFn or not",
         name: "[AST_SymbolDeclaration?] the name of this function",
-        argnames: "[AST_SymbolFunarg*] array of function arguments",
+        argnames: "[AST_SymbolFunarg|AST_Destructuring|AST_Expansion*] array of function arguments, destructurings, or expanding arguments",
         uses_arguments: "[boolean/S] tells whether this function accesses the arguments array"
     },
+    args_as_names: function () {
+        var out = [];
+        for (var i = 0; i < this.argnames.length; i++) {
+            if (this.argnames[i] instanceof AST_Destructuring) {
+                out = out.concat(this.argnames[i].all_symbols());
+            } else {
+                out.push(this.argnames[i]);
+            }
+        }
+        return out;
+    },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
             if (this.name) this.name._walk(visitor);
-            var argnames = this.argnames;
-            for (var i = 0, len = argnames.length; i < len; i++) {
-                argnames[i]._walk(visitor);
-            }
+            this.argnames.forEach(function(arg){
+                arg._walk(visitor);
+            });
             walk_body(this, visitor);
         });
     }
@@ -389,10 +480,79 @@ var AST_Function = DEFNODE("Function", null, {
     $documentation: "A function expression"
 }, AST_Lambda);
 
+var AST_Arrow = DEFNODE("Arrow", null, {
+    $documentation: "An ES6 Arrow function ((a) => b)"
+}, AST_Lambda);
+
 var AST_Defun = DEFNODE("Defun", null, {
     $documentation: "A function definition"
 }, AST_Lambda);
 
+/* -----[ DESTRUCTURING ]----- */
+var AST_Destructuring = DEFNODE("Destructuring", "names is_array default", {
+    $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"
+    },
+    _walk: function(visitor) {
+        return visitor._visit(this, function(){
+            this.names.forEach(function(name){
+                name._walk(visitor);
+            });
+        });
+    },
+    all_symbols: function() {
+        var out = [];
+        this.walk(new TreeWalker(function (node) {
+            if (node instanceof AST_Symbol) {
+                out.push(node);
+            }
+            if (node instanceof AST_Expansion) {
+                out.push(node.expression);
+            }
+        }));
+        return out;
+    }
+});
+
+var AST_PrefixedTemplateString = DEFNODE("PrefixedTemplateString", "template_string prefix", {
+    $documentation: "A templatestring with a prefix, such as String.raw`foobarbaz`",
+    $propdoc: {
+        template_string: "[AST_TemplateString] The template string",
+        prefix: "[AST_SymbolRef|AST_PropAccess] The prefix, which can be a symbol such as `foo` or a dotted expression such as `String.raw`."
+    },
+    _walk: function(visitor) {
+        this.prefix._walk(visitor);
+        this.template_string._walk(visitor);
+    }
+})
+
+var AST_TemplateString = DEFNODE("TemplateString", "segments", {
+    $documentation: "A template string literal",
+    $propdoc: {
+        segments: "[AST_TemplateSegment|AST_Expression]* One or more segments, starting with AST_TemplateSegment. AST_Expression may follow AST_TemplateSegment, but each AST_Expression must be followed by AST_TemplateSegment."
+    },
+    _walk: function(visitor) {
+        return visitor._visit(this, function(){
+            this.segments.forEach(function(seg, i){
+                if (i % 2 !== 0) {
+                    seg._walk(visitor);
+                }
+            });
+        });
+    }
+});
+
+var AST_TemplateSegment = DEFNODE("TemplateSegment", "value raw", {
+    $documentation: "A segment of a template string literal",
+    $propdoc: {
+        value: "Content of the segment",
+        raw: "Raw content of the segment"
+    }
+});
+
 /* -----[ JUMPS ]----- */
 
 var AST_Jump = DEFNODE("Jump", null, {
@@ -535,10 +695,9 @@ var AST_Definitions = DEFNODE("Definitions", "definitions", {
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
-            var definitions = this.definitions;
-            for (var i = 0, len = definitions.length; i < len; i++) {
-                definitions[i]._walk(visitor);
-            }
+            this.definitions.forEach(function(def){
+                def._walk(visitor);
+            });
         });
     }
 }, AST_Statement);
@@ -547,16 +706,78 @@ var AST_Var = DEFNODE("Var", null, {
     $documentation: "A `var` statement"
 }, AST_Definitions);
 
+var AST_Let = DEFNODE("Let", null, {
+    $documentation: "A `let` statement"
+}, AST_Definitions);
+
 var AST_Const = DEFNODE("Const", null, {
     $documentation: "A `const` statement"
 }, AST_Definitions);
 
+var AST_NameImport = DEFNODE("NameImport", "foreign_name name", {
+    $documentation: "The part of the import statement that imports names from a module.",
+    $propdoc: {
+        foreign_name: "[AST_SymbolImportForeign] The name being imported (as specified in the module)",
+        name: "[AST_SymbolImport] The name as it becomes available to this module."
+    },
+    _walk: function (visitor) {
+        return visitor._visit(this, function() {
+            this.foreign_name._walk(visitor);
+            this.name._walk(visitor);
+        });
+    }
+})
+
+var AST_Import = DEFNODE("Import", "imported_name imported_names module_name", {
+    $documentation: "An `import` statement",
+    $propdoc: {
+        imported_name: "[AST_SymbolImport] The name of the variable holding the module's default export.",
+        imported_names: "[AST_NameImport*] The names of non-default imported variables",
+        module_name: "[AST_String] String literal describing where this module came from",
+    },
+    _walk: function(visitor) {
+        return visitor._visit(this, function() {
+            if (this.imported_name) {
+                this.imported_name._walk(visitor);
+            }
+            if (this.imported_names) {
+                this.imported_names.forEach(function (name_import) {
+                    name_import._walk(visitor);
+                });
+            }
+            this.module_name._walk(visitor);
+        });
+    }
+});
+
+var AST_Export = DEFNODE("Export", "exported_definition exported_value is_default", {
+    $documentation: "An `export` statement",
+    $propdoc: {
+        exported_definition: "[AST_Defun|AST_Definitions|AST_DefClass?] An exported definition",
+        exported_value: "[AST_Node?] An exported value",
+        is_default: "[Boolean] Whether this is the default exported value of this module"
+    },
+    _walk: function (visitor) {
+        visitor._visit(this, function () {
+            if (this.exported_definition) {
+                this.exported_definition._walk(visitor);
+            }
+            if (this.exported_value) {
+                this.exported_value._walk(visitor);
+            }
+        });
+    }
+}, AST_Statement);
+
 var AST_VarDef = DEFNODE("VarDef", "name value", {
     $documentation: "A variable declaration; only appears in a AST_Definitions node",
     $propdoc: {
-        name: "[AST_SymbolVar|AST_SymbolConst] name of the variable",
+        name: "[AST_SymbolVar|AST_SymbolConst|AST_Destructuring] name of the variable",
         value: "[AST_Node?] initializer, or null of there's no initializer"
     },
+    is_destructuring: function() {
+        return this.name instanceof AST_Destructuring;
+    },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
             this.name._walk(visitor);
@@ -576,10 +797,9 @@ var AST_Call = DEFNODE("Call", "expression args", {
     _walk: function(visitor) {
         return visitor._visit(this, function(){
             this.expression._walk(visitor);
-            var args = this.args;
-            for (var i = 0, len = args.length; i < len; i++) {
-                args[i]._walk(visitor);
-            }
+            this.args.forEach(function(arg){
+                arg._walk(visitor);
+            });
         });
     }
 });
@@ -746,10 +966,9 @@ var AST_Array = DEFNODE("Array", "elements", {
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
-            var elements = this.elements;
-            for (var i = 0, len = elements.length; i < len; i++) {
-                elements[i]._walk(visitor);
-            }
+            this.elements.forEach(function(el){
+                el._walk(visitor);
+            });
         });
     }
 });
@@ -761,10 +980,9 @@ var AST_Object = DEFNODE("Object", "properties", {
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
-            var properties = this.properties;
-            for (var i = 0, len = properties.length; i < len; i++) {
-                properties[i]._walk(visitor);
-            }
+            this.properties.forEach(function(prop){
+                prop._walk(visitor);
+            });
         });
     }
 });
@@ -772,38 +990,99 @@ var AST_Object = DEFNODE("Object", "properties", {
 var AST_ObjectProperty = DEFNODE("ObjectProperty", "key value", {
     $documentation: "Base class for literal object properties",
     $propdoc: {
-        key: "[string] the property name converted to a string for ObjectKeyVal.  For setters and getters this is an arbitrary AST_Node.",
-        value: "[AST_Node] property value.  For setters and getters this is an AST_Function."
+        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"
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
+            if (this.key instanceof AST_Node)
+                this.key._walk(visitor);
             this.value._walk(visitor);
         });
     }
 });
 
-var AST_ObjectKeyVal = DEFNODE("ObjectKeyVal", "quote", {
+var AST_ObjectKeyVal = DEFNODE("ObjectKeyVal", "quote default", {
     $documentation: "A key: value object property",
     $propdoc: {
-        quote: "[string] the original quote character"
+        quote: "[string] the original quote character",
+        default: "[AST_Expression] The default parameter value, only used when nested inside a binding pattern"
     }
 }, AST_ObjectProperty);
 
-var AST_ObjectSetter = DEFNODE("ObjectSetter", null, {
+var AST_ObjectSetter = DEFNODE("ObjectSetter", "quote static", {
+    $propdoc: {
+        quote: "[string|undefined] the original quote character, if any",
+        static: "[boolean] whether this is a static setter (classes only)"
+    },
     $documentation: "An object setter property",
 }, AST_ObjectProperty);
 
-var AST_ObjectGetter = DEFNODE("ObjectGetter", null, {
+var AST_ObjectGetter = DEFNODE("ObjectGetter", "quote static", {
+    $propdoc: {
+        quote: "[string|undefined] the original quote character, if any",
+        static: "[boolean] whether this is a static getter (classes only)"
+    },
     $documentation: "An object getter property",
 }, AST_ObjectProperty);
 
-var AST_Symbol = DEFNODE("Symbol", "scope name thedef", {
+var AST_ConciseMethod = DEFNODE("ConciseMethod", "quote static is_generator", {
+    $propdoc: {
+        quote: "[string|undefined] the original quote character, if any",
+        static: "[boolean] whether this method is static (classes only)",
+        is_generator: "[boolean] is generatorFn or not",
+    },
+    $documentation: "An ES6 concise method inside an object or class"
+}, AST_ObjectProperty);
+
+var AST_Class = DEFNODE("Class", "name extends properties", {
+    $propdoc: {
+        name: "[AST_SymbolClass|AST_SymbolDefClass?] optional class name.",
+        extends: "[AST_Node]? optional parent class",
+        properties: "[AST_ObjectProperty*] array of properties"
+    },
+    $documentation: "An ES6 class",
+    _walk: function(visitor) {
+        return visitor._visit(this, function(){
+            if (this.name) {
+                this.name._walk(visitor);
+            }
+            if (this.extends) {
+                this.extends._walk(visitor);
+            }
+            this.properties.forEach(function(prop){
+                prop._walk(visitor);
+            });
+        });
+    },
+}, AST_Scope);
+
+var AST_DefClass = DEFNODE("DefClass", null, {
+    $documentation: "A class definition",
+}, AST_Class);
+
+var AST_ClassExpression = DEFNODE("ClassExpression", null, {
+    $documentation: "A class expression."
+}, AST_Class);
+
+var AST_Symbol = DEFNODE("Symbol", "scope name thedef default", {
     $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"
+        thedef: "[SymbolDef/S] the definition of this symbol",
+        default: "[AST_Expression] The default parameter value, only used when nested inside a binding pattern"
     },
     $documentation: "Base class for all symbols",
+    _walk: function (visitor) {
+        return visitor._visit(this, function() {
+            if (this.default) this.default._walk(visitor);
+        });
+    }
+});
+
+var AST_NewTarget = DEFNODE("NewTarget", null, {
+    $documentation: "A reference to new.target"
 });
 
 var AST_SymbolAccessor = DEFNODE("SymbolAccessor", null, {
@@ -814,16 +1093,24 @@ 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, {
     $documentation: "Symbol defining a variable",
 }, AST_SymbolDeclaration);
 
+var AST_SymbolBlockDeclaration = DEFNODE("SymbolBlockDeclaration", null, {
+    $documentation: "Base class for block-scoped declaration symbols"
+}, AST_SymbolDeclaration);
+
 var AST_SymbolConst = DEFNODE("SymbolConst", null, {
     $documentation: "A constant declaration"
-}, AST_SymbolDeclaration);
+}, AST_SymbolBlockDeclaration);
+
+var AST_SymbolLet = DEFNODE("SymbolLet", null, {
+    $documentation: "A block-scoped `let` declaration"
+}, AST_SymbolBlockDeclaration);
 
 var AST_SymbolFunarg = DEFNODE("SymbolFunarg", null, {
     $documentation: "Symbol naming a function argument",
@@ -833,13 +1120,33 @@ var AST_SymbolDefun = DEFNODE("SymbolDefun", null, {
     $documentation: "Symbol defining a function",
 }, AST_SymbolDeclaration);
 
+var AST_SymbolMethod = DEFNODE("SymbolMethod", null, {
+    $documentation: "Symbol in an object defining a method",
+}, AST_Symbol);
+
 var AST_SymbolLambda = DEFNODE("SymbolLambda", null, {
     $documentation: "Symbol naming a function expression",
 }, AST_SymbolDeclaration);
 
+var AST_SymbolDefClass = DEFNODE("SymbolDefClass", null, {
+    $documentation: "Symbol naming a class's name in a class declaration. Lexically scoped to its containing scope, and accessible within the class."
+}, AST_SymbolBlockDeclaration);
+
+var AST_SymbolClass = DEFNODE("SymbolClass", null, {
+    $documentation: "Symbol naming a class's name. Lexically scoped to the class."
+}, AST_SymbolDeclaration);
+
 var AST_SymbolCatch = DEFNODE("SymbolCatch", null, {
     $documentation: "Symbol naming the exception in catch",
-}, AST_SymbolDeclaration);
+}, AST_SymbolBlockDeclaration);
+
+var AST_SymbolImport = DEFNODE("SymbolImport", null, {
+    $documentation: "Symbol refering to an imported name",
+}, AST_SymbolBlockDeclaration);
+
+var AST_SymbolImportForeign = DEFNODE("SymbolImportForeign", null, {
+    $documentation: "A symbol imported from a module, but it is defined in the other module, and its real name is irrelevant for this module's purposes",
+}, AST_Symbol);
 
 var AST_Label = DEFNODE("Label", "references", {
     $documentation: "Symbol naming a label (declaration)",
@@ -864,6 +1171,10 @@ var AST_This = DEFNODE("This", null, {
     $documentation: "The `this` symbol",
 }, AST_Symbol);
 
+var AST_Super = DEFNODE("Super", null, {
+    $documentation: "The `super` symbol",
+}, AST_Symbol);
+
 var AST_Constant = DEFNODE("Constant", null, {
     $documentation: "Base class for all constants",
     getValue: function() {
@@ -937,6 +1248,21 @@ var AST_True = DEFNODE("True", null, {
     value: true
 }, AST_Boolean);
 
+/* -----[ Yield ]----- */
+
+var AST_Yield = DEFNODE("Yield", "expression is_star", {
+    $documentation: "A `yield` statement",
+    $propdoc: {
+        expression: "[AST_Node?] the value returned or thrown by this statement; could be null (representing undefined) but only when is_star is set to false",
+        is_star: "[Boolean] Whether this is a yield or yield* statement"
+    },
+    _walk: function(visitor) {
+        return visitor._visit(this, this.expression && function(){
+            this.expression._walk(visitor);
+        });
+    }
+});
+
 /* -----[ TreeWalker ]----- */
 
 function TreeWalker(callback) {
@@ -964,12 +1290,15 @@ TreeWalker.prototype = {
             this.directives = Object.create(this.directives);
         } else if (node instanceof AST_Directive) {
             this.directives[node.value] = this.directives[node.value] ? "up" : true;
+        } else if (node instanceof AST_Class) {
+            this.directives = Object.create(this.directives);
+            this.directives["use strict"] = this.directives["use strict"] ? "up" : true;
         }
         this.stack.push(node);
     },
     pop: function(node) {
         this.stack.pop();
-        if (node instanceof AST_Lambda) {
+        if (node instanceof AST_Lambda || node instanceof AST_Class) {
             this.directives = Object.getPrototypeOf(this.directives);
         }
     },
@@ -987,7 +1316,7 @@ TreeWalker.prototype = {
         var dir = this.directives[type];
         if (dir) return dir;
         var node = this.stack[this.stack.length - 1];
-        if (node instanceof AST_Scope) {
+        if (node instanceof AST_Scope && node.body) {
             for (var i = 0; i < node.body.length; ++i) {
                 var st = node.body[i];
                 if (!(st instanceof AST_Directive)) break;

lib/output.js

@@ -67,10 +67,11 @@ function OutputStream(options) {
         quote_keys       : false,
         space_colon      : true,
         ascii_only       : false,
+        ascii_identifiers: undefined,
         unescape_regexps : false,
         inline_script    : false,
         width            : 80,
-        max_line_len     : false,
+        max_line_len     : 32000,
         beautify         : false,
         source_map       : null,
         bracketize       : false,
@@ -82,9 +83,17 @@ function OutputStream(options) {
         preamble         : null,
         quote_style      : 0,
         keep_quoted_props: false,
+        shorthand        : undefined,
+        ecma             : 5,
         wrap_iife        : false,
     }, true);
 
+    if (typeof options.ascii_identifiers === 'undefined')
+        options.ascii_identifiers = options.ascii_only;
+
+    if (options.shorthand === undefined)
+        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
     if (options.comments) {
@@ -120,9 +129,19 @@ function OutputStream(options) {
     var OUTPUT = "";
 
     function to_ascii(str, identifier) {
-        return str.replace(/[\u0000-\u001f\u007f-\uffff]/g, function(ch) {
-            var code = ch.charCodeAt(0).toString(16);
-            if (code.length <= 2 && !identifier) {
+        return str.replace(/[\ud800-\udbff][\udc00-\udfff]|[\u0000-\u001f\u007f-\uffff]/g, function(ch) {
+            var code = get_full_char_code(ch, 0).toString(16);
+
+            if ((identifier && code.length === 1 && options.ecma >= 6) || code.length > 4) {
+                if (options.ecma < 6) {
+                    if (identifier) {
+                        return ch; // no \u{} support
+                    }
+                    return "\\u" + ch.charCodeAt(0).toString(16) + "\\u"
+                        + ch.charCodeAt(1).toString(16);
+                }
+                return "\\u{" + code + "}";
+            } else if (code.length <= 2 && !identifier) {
                 while (code.length < 2) code = "0" + code;
                 return "\\x" + code;
             } else {
@@ -150,7 +169,7 @@ function OutputStream(options) {
               case "\u2029": return "\\u2029";
               case "\ufeff": return "\\ufeff";
               case "\0":
-                  return /[0-7]/.test(str.charAt(i+1)) ? "\\x00" : "\\0";
+                  return /[0-7]/.test(get_full_char(str, i+1)) ? "\\x00" : "\\0";
             }
             return s;
         });
@@ -160,7 +179,22 @@ function OutputStream(options) {
         function quote_double() {
             return '"' + str.replace(/\x22/g, '\\"') + '"';
         }
+        function quote_template() {
+            if (!options.ascii_only) {
+                str = str.replace(/\\(n|r|u2028|u2029)/g, function(s, c) {
+                    switch(c) {
+                        case "n": return "\n";
+                        case "r": return "\r";
+                        case "u2028": return "\u2028";
+                        case "u2029": return "\u2029";
+                    }
+                    return s;
+                });
+            }
+            return '`' + str.replace(/`/g, '\\`') + '`';
+        }
         if (options.ascii_only) str = to_ascii(str);
+        if (quote === "`") return quote_template();
         switch (options.quote_style) {
           case 1:
             return quote_single();
@@ -185,7 +219,7 @@ function OutputStream(options) {
 
     function make_name(name) {
         name = name.toString();
-        if (options.ascii_only)
+        if (options.ascii_identifiers)
             name = to_ascii(name, true);
         return name;
     };
@@ -198,35 +232,28 @@ function OutputStream(options) {
 
     var might_need_space = false;
     var might_need_semicolon = false;
-    var might_add_newline = 0;
     var last = null;
 
     function last_char() {
-        return last.charAt(last.length - 1);
+        var char = last.charAt(last.length - 1);
+
+        if (is_surrogate_pair_tail(char)) {
+            return last.charAt(last.length - 2) + char;
+        }
+
+        return char;
     };
 
-    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;
+    function maybe_newline() {
+        if (options.max_line_len && current_col > options.max_line_len)
+            print("\n");
+    };
 
     var requireSemicolonChars = makePredicate("( [ + * / - , .");
 
     function print(str) {
         str = String(str);
-        var ch = str.charAt(0);
+        var ch = get_full_char(str, 0);
         if (might_need_semicolon) {
             might_need_semicolon = false;
 
@@ -236,7 +263,6 @@ function OutputStream(options) {
                     current_col++;
                     current_pos++;
                 } else {
-                    ensure_line_len();
                     OUTPUT += "\n";
                     current_pos++;
                     current_line++;
@@ -257,7 +283,6 @@ 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++;
@@ -269,9 +294,8 @@ function OutputStream(options) {
         if (might_need_space) {
             var prev = last_char();
             if ((is_identifier_char(prev)
-                    && (is_identifier_char(ch) || ch == "\\"))
-                || (ch == "/" && ch == prev)
-                || ((ch == "+" || ch == "-") && ch == last))
+                 && (is_identifier_char(ch) || ch == "\\"))
+                || (/^[\+\-\/]$/.test(ch) && ch == prev))
             {
                 OUTPUT += " ";
                 current_col++;
@@ -279,18 +303,22 @@ 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;
-        current_col += a[0].length;
-        if (n > 0) {
-            ensure_line_len();
+        if (n == 0) {
+            current_col += a[n].length;
+        } else {
             current_col = a[n].length;
         }
+        current_pos += str.length;
         last = str;
+        OUTPUT += str;
     };
 
+    var star = function(){
+        print("*");
+    }
+
     var space = options.beautify ? function() {
         print(" ");
     } : function() {
@@ -314,10 +342,7 @@ function OutputStream(options) {
 
     var newline = options.beautify ? function() {
         print("\n");
-    } : options.max_line_len ? function() {
-        ensure_line_len();
-        might_add_newline = OUTPUT.length;
-    } : noop;
+    } : maybe_newline;
 
     var semicolon = options.beautify ? function() {
         print(";");
@@ -394,9 +419,6 @@ function OutputStream(options) {
     } : noop;
 
     function get() {
-        if (might_add_newline) {
-            ensure_line_len();
-        }
         return OUTPUT;
     };
 
@@ -414,6 +436,7 @@ function OutputStream(options) {
         should_break    : function() { return options.width && this.current_width() >= options.width },
         newline         : newline,
         print           : print,
+        star            : star,
         space           : space,
         comma           : comma,
         colon           : colon,
@@ -433,6 +456,10 @@ function OutputStream(options) {
             }
             print(encoded);
         },
+        print_template_string_chars: function(str) {
+            var encoded = encode_string(str, '`').replace(/\${/g, "\\${");
+            return print(encoded.substr(1, encoded.length - 2));
+        },
         encode_string   : encode_string,
         next_indent     : next_indent,
         with_indent     : with_indent,
@@ -447,6 +474,7 @@ 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)];
         }
@@ -595,7 +623,13 @@ function OutputStream(options) {
     PARENS([ AST_Unary, AST_Undefined ], function(output){
         var p = output.parent();
         return p instanceof AST_PropAccess && p.expression === this
-            || p instanceof AST_Call && p.expression === this;
+            || p instanceof AST_Call && p.expression === this
+            || p instanceof AST_Binary
+                && p.operator === "**"
+                && this instanceof AST_UnaryPrefix
+                && p.left === this
+                && this.operator !== "++"
+                && this.operator !== "--";
     });
 
     PARENS(AST_Seq, function(output){
@@ -607,8 +641,13 @@ 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)
         ;
     });
 
@@ -635,6 +674,20 @@ function OutputStream(options) {
         }
     });
 
+    PARENS(AST_Yield, function(output){
+        var p = output.parent();
+        // (yield 1) + (yield 2)
+        // a = yield 3
+        if (p instanceof AST_Binary && p.operator !== "=")
+            return true;
+        // (yield 1) ? yield 2 : yield 3
+        if (p instanceof AST_Conditional && p.condition === this)
+            return true;
+        // -(yield 4)
+        if (p instanceof AST_Unary)
+            return true;
+    });
+
     PARENS(AST_PropAccess, function(output){
         var p = output.parent();
         if (p instanceof AST_New && p.expression === this) {
@@ -712,6 +765,34 @@ function OutputStream(options) {
         output.print_string(self.value, self.quote);
         output.semicolon();
     });
+
+    DEFPRINT(AST_Expansion, function (self, output) {
+        output.print('...');
+        self.expression.print(output);
+    });
+
+    DEFPRINT(AST_Destructuring, function (self, output) {
+        output.print(self.is_array ? "[" : "{");
+        var first = true;
+        var len = self.names.length;
+        self.names.forEach(function (name, i) {
+            if (first) first = false; else { output.comma(); output.space(); }
+            name.print(output);
+            // If the final element is a hole, we need to make sure it
+            // doesn't look like a trailing comma, by inserting an actual
+            // trailing comma.
+            if (i === len - 1 && name instanceof AST_Hole)
+              output.comma();
+        })
+        output.print(self.is_array ? "]" : "}");
+        if (self.default) {
+            output.space();
+            output.print('=');
+            output.space();
+            self.default.print(output)
+        }
+    });
+
     DEFPRINT(AST_Debugger, function(self, output){
         output.print("debugger");
         output.semicolon();
@@ -836,7 +917,11 @@ function OutputStream(options) {
         output.with_parens(function(){
             self.init.print(output);
             output.space();
-            output.print("in");
+            if (self instanceof AST_ForOf) {
+                output.print("of");
+            } else {
+                output.print("in");
+            }
             output.space();
             self.object.print(output);
         });
@@ -858,10 +943,23 @@ function OutputStream(options) {
         var self = this;
         if (!nokeyword) {
             output.print("function");
+            if (this.is_generator) {
+                output.star();
+            }
+            if (self.name) {
+                output.space();
+            }
         }
-        if (self.name) {
-            output.space();
-            self.name.print(output);
+        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);
+            }
+        } else if (nokeyword && self.name instanceof AST_Node) {
+            output.with_square(function() {
+                self.name.print(output); // Computed method name
+            });
         }
         output.with_parens(function(){
             self.argnames.forEach(function(arg, i){
@@ -876,6 +974,56 @@ function OutputStream(options) {
         self._do_print(output);
     });
 
+    DEFPRINT(AST_PrefixedTemplateString, function(self, output) {
+        self.prefix.print(output);
+        self.template_string.print(output);
+    });
+    DEFPRINT(AST_TemplateString, function(self, output) {
+        var is_tagged = output.parent() instanceof AST_PrefixedTemplateString;
+
+        output.print("`");
+        for (var i = 0; i < self.segments.length; i++) {
+            if (!(self.segments[i] instanceof AST_TemplateSegment)) {
+                output.print("${");
+                self.segments[i].print(output);
+                output.print("}");
+            } else if (is_tagged) {
+                output.print(self.segments[i].raw);
+            } else {
+                output.print_template_string_chars(self.segments[i].value);
+            }
+        }
+        output.print("`");
+    });
+
+    AST_Arrow.DEFMETHOD("_do_print", function(output){
+        var self = this;
+        var parent = output.parent();
+        var needs_parens = parent instanceof AST_Binary ||
+            parent instanceof AST_Unary ||
+            (parent instanceof AST_Call && self === parent.expression);
+        if (needs_parens) { output.print("(") }
+        if (self.argnames.length === 1 && self.argnames[0] instanceof AST_Symbol && !self.argnames[0].default) {
+            self.argnames[0].print(output);
+        } else {
+            output.with_parens(function(){
+                self.argnames.forEach(function(arg, i){
+                    if (i) output.comma();
+                    arg.print(output);
+                });
+            });
+        }
+        output.space();
+        output.print('=>');
+        output.space();
+        if (self.body instanceof AST_Node) {
+            this.body.print(output);
+        } else {
+            print_bracketed(this.body, output);
+        }
+        if (needs_parens) { output.print(")") }
+    });
+
     /* -----[ exits ]----- */
     AST_Exit.DEFMETHOD("_do_print", function(output, kind){
         output.print(kind);
@@ -892,6 +1040,17 @@ function OutputStream(options) {
         self._do_print(output, "throw");
     });
 
+    /* -----[ yield ]----- */
+
+    DEFPRINT(AST_Yield, function(self, output){
+        var star = self.is_star ? "*" : "";
+        output.print("yield" + star);
+        if (self.expression) {
+            output.space();
+            self.expression.print(output);
+        }
+    });
+
     /* -----[ loop control ]----- */
     AST_LoopControl.DEFMETHOD("_do_print", function(output, kind){
         output.print(kind);
@@ -960,10 +1119,7 @@ function OutputStream(options) {
             output.space();
             output.print("else");
             output.space();
-            if (self.alternative instanceof AST_If)
-                self.alternative.print(output);
-            else
-                force_statement(self.alternative, output);
+            force_statement(self.alternative, output);
         } else {
             self._do_print_body(output);
         }
@@ -1051,12 +1207,77 @@ function OutputStream(options) {
         if (!avoid_semicolon)
             output.semicolon();
     });
+    DEFPRINT(AST_Let, function(self, output){
+        self._do_print(output, "let");
+    });
     DEFPRINT(AST_Var, function(self, output){
         self._do_print(output, "var");
     });
     DEFPRINT(AST_Const, function(self, output){
         self._do_print(output, "const");
     });
+    DEFPRINT(AST_Import, function(self, output) {
+        output.print("import");
+        output.space();
+        if (self.imported_name) {
+            self.imported_name.print(output);
+        }
+        if (self.imported_name && self.imported_names) {
+            output.print(",");
+            output.space();
+        }
+        if (self.imported_names) {
+            output.print("{");
+            self.imported_names.forEach(function(name_import, i) {
+                output.space();
+                name_import.print(output);
+                if (i < self.imported_names.length - 1) {
+                    output.print(",");
+                    output.space();
+                }
+            });
+            output.space();
+            output.print("}");
+        }
+        if (self.imported_name || self.imported_names) {
+            output.space();
+            output.print("from")
+            output.space();
+        }
+        self.module_name.print(output);
+        output.semicolon();
+    });
+
+    DEFPRINT(AST_NameImport, function(self, output) {
+        var definition = self.name.definition();
+        var names_are_different =
+            (definition && definition.mangled_name || self.name.name) !==
+            self.foreign_name.name;
+        if (names_are_different) {
+            output.print(self.foreign_name.name);
+            output.space();
+            output.print("as");
+            output.space();
+            self.name.print(output);
+        } else {
+            self.name.print(output);
+        }
+    });
+
+    DEFPRINT(AST_Export, function(self, output) {
+        output.print("export");
+        output.space();
+        if (self.is_default) {
+            output.print("default");
+            output.space();
+        }
+        if (self.exported_value) {
+            self.exported_value.print(output);
+        } else if (self.exported_definition) {
+            self.exported_definition.print(output);
+        }
+        output.semicolon();
+    });
 
     function parenthesize_for_noin(node, output, noin) {
         if (!noin) node.print(output);
@@ -1228,9 +1449,35 @@ function OutputStream(options) {
         });
         else output.print("{}");
     });
-    DEFPRINT(AST_ObjectKeyVal, function(self, output){
-        var key = self.key;
-        var quote = self.quote;
+    DEFPRINT(AST_Class, function(self, output){
+        output.print("class");
+        output.space();
+        if (self.name) {
+            self.name.print(output);
+            output.space();
+        }
+        if (self.extends) {
+            output.print("extends");
+            output.space();
+            self.extends.print(output);
+            output.space();
+        }
+        if (self.properties.length > 0) output.with_block(function(){
+            self.properties.forEach(function(prop, i){
+                if (i) {
+                    output.newline();
+                }
+                output.indent();
+                prop.print(output);
+            });
+            output.newline();
+        });
+        else output.print("{}");
+    });
+    DEFPRINT(AST_NewTarget, function(self, output) {
+        output.print("new.target");
+    });
+    AST_ObjectProperty.DEFMETHOD("print_property_name", function(key, quote, output) {
         if (output.option("quote_keys")) {
             output.print_string(key + "");
         } else if ((typeof key == "number"
@@ -1247,24 +1494,91 @@ function OutputStream(options) {
         } else {
             output.print_string(key, quote);
         }
-        output.colon();
-        self.value.print(output);
+    });
+    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;
+        }
+        if (output.option("shorthand") &&
+            self.value instanceof AST_Symbol &&
+            is_identifier_string(self.key) &&
+            get_name(self) === self.key
+        ) {
+            self.print_property_name(self.key, self.quote, output);
+        } else {
+            if (!(self.key instanceof AST_Node)) {
+                self.print_property_name(self.key, self.quote, output);
+            } else {
+                output.with_square(function() {
+                    self.key.print(output);
+                });
+            }
+            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) {
+            output.print("static");
+            output.space();
+        }
+        output.print(type);
+        output.space();
+        if (self.key instanceof AST_SymbolMethod) {
+            self.print_property_name(self.key.name, self.quote, output);
+        } else {
+            output.with_square(function() {
+                self.key.print(output);
+            });
+        }
+        self.value._do_print(output, true);
     });
     DEFPRINT(AST_ObjectSetter, function(self, output){
-        output.print("set");
-        output.space();
-        self.key.print(output);
-        self.value._do_print(output, true);
+        self._print_getter_setter("set", self, output);
     });
     DEFPRINT(AST_ObjectGetter, function(self, output){
-        output.print("get");
+        self._print_getter_setter("get", self, output);
+    });
+    DEFPRINT(AST_ConciseMethod, function(self, output){
+        if (self.static) {
+            output.print("static");
+            output.space();
+        }
+        if (self.is_generator) {
+            output.print("*");
+        }
         output.space();
-        self.key.print(output);
+        if (self.key instanceof AST_SymbolMethod) {
+            self.print_property_name(self.key.name, self.quote, output);
+        } else {
+            output.with_square(function() {
+                self.key.print(output);
+            });
+        }
         self.value._do_print(output, true);
     });
-    DEFPRINT(AST_Symbol, function(self, output){
-        var def = self.definition();
-        output.print_name(def ? def.mangled_name || def.name : self.name);
+    AST_Symbol.DEFMETHOD("_do_print", function(output){
+        var def = this.definition();
+        output.print_name(def ? def.mangled_name || def.name : this.name);
+    });
+    DEFPRINT(AST_Symbol, function (self, output) {
+        self._do_print(output);
+    });
+    DEFPRINT(AST_SymbolDeclaration, function(self, output){
+        self._do_print(output);
+        if (self.default) {
+            output.space();
+            output.print('=');
+            output.space();
+            self.default.print(output)
+        }
     });
     DEFPRINT(AST_Undefined, function(self, output){
         output.print("void 0");
@@ -1279,6 +1593,9 @@ function OutputStream(options) {
     DEFPRINT(AST_This, function(self, output){
         output.print("this");
     });
+    DEFPRINT(AST_Super, function(self, output){
+        output.print("super");
+    });
     DEFPRINT(AST_Constant, function(self, output){
         output.print(self.getValue());
     });
@@ -1358,6 +1675,30 @@ 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

lib/propmangle.js

@@ -44,10 +44,27 @@
 "use strict";
 
 function find_builtins() {
+
+    // Compatibility fix for some standard defined globals not defined on every js environment
+    var new_globals = ["Symbol", "Map", "Promise", "Proxy", "Reflect", "Set", "WeakMap", "WeakSet"];
+    var objects = {};
+
+    new_globals.forEach(function (new_global) {
+        objects[new_global] = global[new_global] || new Function();
+    });
+
     var a = [];
     [ Object, Array, Function, Number,
       String, Boolean, Error, Math,
-      Date, RegExp
+      Date, RegExp, objects.Symbol, ArrayBuffer,
+      DataView, decodeURI, decodeURIComponent,
+      encodeURI, encodeURIComponent, eval, EvalError,
+      Float32Array, Float64Array, Int8Array, Int16Array,
+      Int32Array, isFinite, isNaN, JSON, objects.Map, parseFloat,
+      parseInt, objects.Promise, objects.Proxy, RangeError, ReferenceError,
+      objects.Reflect, objects.Set, SyntaxError, TypeError, Uint8Array,
+      Uint8ClampedArray, Uint16Array, Uint32Array, URIError,
+      objects.WeakMap, objects.WeakSet
     ].forEach(function(ctor){
         Object.getOwnPropertyNames(ctor).map(add);
         if (ctor.prototype) {
@@ -113,6 +130,9 @@ function mangle_properties(ast, options) {
         else if (node instanceof AST_Sub) {
             addStrings(node.property, ignore_quoted);
         }
+        else if (node instanceof AST_ConciseMethod) {
+            add(node.name.name);
+        }
     }));
 
     // step 2: transform the tree, renaming properties
@@ -132,6 +152,11 @@ function mangle_properties(ast, options) {
             if (!ignore_quoted)
                 node.property = mangleStrings(node.property);
         }
+        else if (node instanceof AST_ConciseMethod) {
+            if (should_mangle(node.name.name)) {
+                node.name.name = mangle(node.name.name);
+            }
+        }
         // else if (node instanceof AST_String) {
         //     if (should_mangle(node.value)) {
         //         AST_Node.warn(
@@ -149,7 +174,6 @@ 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

@@ -49,8 +49,11 @@ function SymbolDef(scope, index, orig) {
     this.scope = scope;
     this.references = [];
     this.global = false;
+    this.export = false;
     this.mangled_name = null;
+    this.object_destructuring_arg = false;
     this.undeclared = false;
+    this.constant = false;
     this.index = index;
     this.id = SymbolDef.next_id++;
 };
@@ -62,11 +65,17 @@ SymbolDef.prototype = {
         if (!options) options = {};
 
         return (this.global && !options.toplevel)
+            || this.export
+            || this.object_destructuring_arg
             || this.undeclared
             || (!options.eval && (this.scope.uses_eval || this.scope.uses_with))
             || (options.keep_fnames
                 && (this.orig[0] instanceof AST_SymbolLambda
-                    || this.orig[0] instanceof AST_SymbolDefun));
+                    || this.orig[0] instanceof AST_SymbolDefun))
+            || this.orig[0] instanceof AST_SymbolMethod
+            || (options.keep_classnames
+                && (this.orig[0] instanceof AST_SymbolClass
+                    || this.orig[0] instanceof AST_SymbolDefClass));
     },
     mangle: function(options) {
         var cache = options.cache && options.cache.props;
@@ -96,29 +105,49 @@ 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 tw = new TreeWalker(function(node, descend){
-        if (options.screw_ie8 && node instanceof AST_Catch) {
+        if (node.is_block_scope()) {
             var save_scope = scope;
             scope = new AST_Scope(node);
-            scope.init_scope_vars();
+            scope.init_scope_vars(nesting);
             scope.parent_scope = save_scope;
+            if (!(node instanceof AST_Scope)) {
+                scope.uses_with = save_scope.uses_with;
+                scope.uses_eval = save_scope.uses_eval;
+                scope.directives = save_scope.directives;
+            }
             descend();
             scope = save_scope;
             return true;
         }
+        if (node instanceof AST_Destructuring && node.is_array === false) {
+            in_destructuring = node;  // These don't nest
+            descend();
+            in_destructuring = null;
+            return true;
+        }
         if (node instanceof AST_Scope) {
-            node.init_scope_vars();
+            node.init_scope_vars(nesting);
             var save_scope = node.parent_scope = scope;
             var save_defun = defun;
             var save_labels = labels;
             defun = scope = node;
             labels = new Dictionary();
-            descend();
+            ++nesting; descend(); --nesting;
             scope = save_scope;
             defun = save_defun;
             labels = save_labels;
             return true;        // don't descend again in TreeWalker
         }
+        if (node instanceof AST_Export) {
+            in_export = true;
+            descend();
+            in_export = false;
+        }
         if (node instanceof AST_LabeledStatement) {
             var l = node.label;
             if (labels.has(l.name)) {
@@ -137,12 +166,16 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
         if (node instanceof AST_Symbol) {
             node.scope = scope;
         }
+        if (node instanceof AST_SymbolFunarg) {
+            node.object_destructuring_arg = !!in_destructuring;
+            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);
+            defun.def_function(node, in_export);
         }
         else if (node instanceof AST_SymbolDefun) {
             // Careful here, the scope where this should be defined is
@@ -150,11 +183,32 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
             // scope when we encounter the AST_Defun node (which is
             // instanceof AST_Scope) but we get to the symbol a bit
             // later.
-            (node.scope = defun.parent_scope).def_function(node);
+            var parent_lambda = defun.parent_scope;
+            while (parent_lambda.is_block_scope()) {
+                parent_lambda = parent_lambda.parent_scope;
+            }
+            (node.scope = parent_lambda).def_function(node, in_export);
+        }
+        else if (node instanceof AST_SymbolClass) {
+            defun.def_variable(node, in_export);
+        }
+        else if (node instanceof AST_SymbolImport) {
+            scope.def_variable(node, in_export);
+        }
+        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();
         }
         else if (node instanceof AST_SymbolVar
-                 || node instanceof AST_SymbolConst) {
-            var def = defun.def_variable(node);
+                 || 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;
+            def.destructuring = in_destructuring;
             def.init = tw.parent().value;
         }
         else if (node instanceof AST_SymbolCatch) {
@@ -175,6 +229,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
 
     // pass 2: find back references and eval
     var func = null;
+    var cls = null;
     var globals = self.globals = new Dictionary();
     var tw = new TreeWalker(function(node, descend){
         if (node instanceof AST_Lambda) {
@@ -184,13 +239,21 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
             func = prev_func;
             return true;
         }
+        if (node instanceof AST_Class) {
+            var prev_cls = cls;
+            cls = node;
+            descend();
+            cls = prev_cls;
+            return true;
+        }
         if (node instanceof AST_LoopControl && node.label) {
             node.label.thedef.references.push(node);
             return true;
         }
         if (node instanceof AST_SymbolRef) {
             var name = node.name;
-            if (name == "eval" && tw.parent() instanceof AST_Call) {
+            var parent = tw.parent();
+            if (name == "eval" && parent instanceof AST_Call) {
                 for (var s = node.scope; s && !s.uses_eval; s = s.parent_scope) {
                     s.uses_eval = true;
                 }
@@ -200,10 +263,23 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
                 node.scope.uses_arguments = true;
             }
             if (!sym) {
-                sym = self.def_global(node);
+                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;
             }
             node.thedef = sym;
-            node.reference(options);
+            if (parent instanceof AST_Unary && (parent.operator === '++' || parent.operator === '--')
+             || parent instanceof AST_Assign && parent.left === node) {
+                sym.modified = true;
+            }
+            node.reference();
             return true;
         }
     });
@@ -214,20 +290,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
     }
 });
 
-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(){
+AST_Scope.DEFMETHOD("init_scope_vars", function(nesting){
     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
@@ -235,6 +298,20 @@ AST_Scope.DEFMETHOD("init_scope_vars", function(){
     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(){
+    return false; // Behaviour will be overridden by AST_Block
+});
+
+AST_Block.DEFMETHOD("is_block_scope", function(){
+    return (
+        !(this instanceof AST_Lambda) &&
+        !(this instanceof AST_Toplevel) &&
+        !(this instanceof AST_Class) &&
+        !(this instanceof AST_SwitchBranch)
+    );
 });
 
 AST_Lambda.DEFMETHOD("init_scope_vars", function(){
@@ -246,20 +323,16 @@ AST_Lambda.DEFMETHOD("init_scope_vars", function(){
     this.variables.set(symbol.name, def);
 });
 
-AST_SymbolRef.DEFMETHOD("reference", function(options) {
+AST_SymbolRef.DEFMETHOD("reference", function() {
     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){
@@ -268,16 +341,20 @@ AST_Scope.DEFMETHOD("find_variable", function(name){
         || (this.parent_scope && this.parent_scope.find_variable(name));
 });
 
-AST_Scope.DEFMETHOD("def_function", function(symbol){
-    this.functions.set(symbol.name, this.def_variable(symbol));
+AST_Scope.DEFMETHOD("def_function", function(symbol, in_export){
+    this.functions.set(symbol.name, this.def_variable(symbol, in_export));
 });
 
-AST_Scope.DEFMETHOD("def_variable", function(symbol){
+AST_Scope.DEFMETHOD("def_variable", function(symbol, in_export){
     var def;
     if (!this.variables.has(symbol.name)) {
         def = new SymbolDef(this, this.variables.size(), symbol);
         this.variables.set(symbol.name, def);
-        def.global = !this.parent_scope;
+        def.object_destructuring_arg = symbol.object_destructuring_arg;
+        if (in_export) {
+            def.export = true;
+        }
+        def.global = !this.parent_scope && !(symbol instanceof AST_SymbolBlockDeclaration);
     } else {
         def = this.variables.get(symbol.name);
         def.orig.push(symbol);
@@ -324,8 +401,14 @@ 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){
-    return this.definition().unmangleable(options);
+    var def = this.definition();
+    return def && def.unmangleable(options);
 });
 
 // property accessors are not mangleable
@@ -363,6 +446,12 @@ 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      : [],
@@ -370,7 +459,8 @@ AST_Toplevel.DEFMETHOD("_default_mangler_options", function(options){
         sort        : false, // Ignored. Flag retained for backwards compatibility.
         toplevel    : false,
         screw_ie8   : true,
-        keep_fnames : false
+        keep_fnames : false,
+        keep_classnames : false
     });
 });
 
@@ -419,13 +509,19 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options){
             node.mangled_name = name;
             return true;
         }
-        if (options.screw_ie8 && node instanceof AST_SymbolCatch) {
+        var mangle_with_block_scope =
+            (options.screw_ie8 && node instanceof AST_SymbolCatch) ||
+            node instanceof AST_SymbolBlockDeclaration;
+        if (mangle_with_block_scope) {
             to_mangle.push(node.definition());
             return;
         }
     });
     this.walk(tw);
-    to_mangle.forEach(function(def){ def.mangle(options) });
+    to_mangle.forEach(function(def){
+        if (def.destructuring && !def.destructuring.is_array) return;
+        def.mangle(options);
+    });
 
     if (options.cache) {
         options.cache.cname = this.cname;
@@ -476,21 +572,27 @@ AST_Toplevel.DEFMETHOD("compute_char_frequency", function(options){
         else if (node instanceof AST_With)
             base54.consider("with");
         else if (node instanceof AST_ObjectSetter)
-            base54.consider("set" + node.key);
+            base54.consider("set" + (typeof node.key === "string" ? node.key : ""));
         else if (node instanceof AST_ObjectGetter)
-            base54.consider("get" + node.key);
-        else if (node instanceof AST_ObjectKeyVal)
+            base54.consider("get" + (typeof node.key === "string" ? node.key : ""));
+        else if (node instanceof AST_ObjectKeyVal && typeof node.key === "string")
+            base54.consider(node.key);
+        else if (node instanceof AST_ConciseMethod && typeof node.key === "string")
             base54.consider(node.key);
         else if (node instanceof AST_New)
             base54.consider("new");
         else if (node instanceof AST_This)
             base54.consider("this");
+        else if (node instanceof AST_Super)
+            base54.consider("super");
         else if (node instanceof AST_Try)
             base54.consider("try");
         else if (node instanceof AST_Catch)
             base54.consider("catch");
         else if (node instanceof AST_Finally)
             base54.consider("finally");
+        else if (node instanceof AST_Yield)
+            base54.consider("yield");
         else if (node instanceof AST_Symbol && node.unmangleable(options))
             base54.consider(node.name);
         else if (node instanceof AST_Unary || node instanceof AST_Binary)

lib/transform.js

@@ -163,10 +163,18 @@ TreeTransformer.prototype = new TreeWalker;
         if (self.value) self.value = self.value.transform(tw);
     });
 
+    _(AST_Destructuring, function(self, tw) {
+        self.names = do_list(self.names, tw);
+    });
+
     _(AST_Lambda, function(self, tw){
         if (self.name) self.name = self.name.transform(tw);
         self.argnames = do_list(self.argnames, tw);
-        self.body = do_list(self.body, tw);
+        if (self.body instanceof AST_Node) {
+            self.body = self.body.transform(tw);
+        } else {
+            self.body = do_list(self.body, tw);
+        }
     });
 
     _(AST_Call, function(self, tw){
@@ -188,6 +196,10 @@ TreeTransformer.prototype = new TreeWalker;
         self.property = self.property.transform(tw);
     });
 
+    _(AST_Yield, function(self, tw){
+        if (self.expression) self.expression = self.expression.transform(tw);
+    });
+
     _(AST_Unary, function(self, tw){
         self.expression = self.expression.transform(tw);
     });
@@ -212,7 +224,32 @@ TreeTransformer.prototype = new TreeWalker;
     });
 
     _(AST_ObjectProperty, function(self, tw){
+        if (self.key instanceof AST_Node) {
+            self.key = self.key.transform(tw);
+        }
         self.value = self.value.transform(tw);
     });
 
+    _(AST_Class, function(self, tw){
+        if (self.name) self.name = self.name.transform(tw);
+        if (self.extends) self.extends = self.extends.transform(tw);
+        self.properties = do_list(self.properties, tw);
+    });
+
+    _(AST_Expansion, function(self, tw){
+        self.expression = self.expression.transform(tw);
+    });
+
+    _(AST_TemplateString, function(self, tw) {
+        for (var i = 0; i < self.segments.length; i++) {
+            if (!(self.segments[i] instanceof AST_TemplateSegment)) {
+                self.segments[i] = self.segments[i].transform(tw);
+            }
+        }
+    });
+
+    _(AST_PrefixedTemplateString, function(self, tw) {
+        self.template_string = self.template_string.transform(tw);
+    });
+
 })();

lib/utils.js

@@ -78,28 +78,13 @@ 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) {
-    this.message = msg;
+    Error.call(this, msg);
+    this.msg = 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);
@@ -335,26 +320,3 @@ 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

@@ -0,0 +1,128 @@
+{
+  "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": "2.8.2",
+  "version": "2.7.5",
   "engines": {
     "node": ">=0.8.0"
   },

test/benchmark.js

@@ -1,49 +0,0 @@
-#! /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) {
-        urls.forEach(function(url) {
-            console.log();
-            console.log(url);
-            console.log(results[url].time);
-            console.log("SHA1:", results[url].sha1);
-        });
-    }
-}
-urls.forEach(function(url) {
-    results[url] = { time: "" };
-    require(url.slice(0, url.indexOf(":"))).get(url, function(res) {
-        var uglifyjs = fork("bin/uglifyjs", args, { silent: true });
-        res.pipe(uglifyjs.stdin);
-        uglifyjs.stdout.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].time += data;
-        }).on("end", done)
-    });
-});

test/compress/arrays.js

@@ -1,3 +1,5 @@
+// NOTE trailing comma doesn't contribute to length of an array
+// That also means the array changes length if previous element is a hole too and got cut off
 holes_and_undefined: {
     input: {
         w = [1,,];
@@ -21,19 +23,10 @@ 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("");
@@ -42,19 +35,10 @@ 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 = "";
@@ -91,87 +75,75 @@ constant_join_2: {
     }
 }
 
-constant_join_3: {
-    options = {
-        unsafe: true,
-        evaluate: true,
-    };
+spread_with_variable_as_last_element: {
     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("");
+        var values = [4, 5, 6];
+        var a = [1, 2, 3, ...values];
     }
     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");
+        var values = [4, 5, 6];
+        var a = [1, 2, 3, ...values];
     }
 }
 
-for_loop: {
-    options = {
-        unsafe      : true,
-        unused      : true,
-        evaluate    : true,
-        reduce_vars : true
-    };
+spread_with_variable_in_middle: {
     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]++;
-            }
-        }
+        var values = [4, 5, 6];
+        var a = [1, 2, 3, ...values, 7,,,];
     }
     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]++;
-        }
+        var values = [4, 5, 6];
+        var a = [1, 2, 3, ...values, 7,,,];
     }
 }
+
+spread_with_variable_at_front: {
+    input: {
+        var values = [1, 2, 3];
+        var a = [...values, 4, 5, 6];
+    }
+    expect: {
+        var values = [1, 2, 3];
+        var a = [...values, 4, 5, 6];
+    }
+}
+
+spread_with_variable_at_front_after_elisions: {
+    input: {
+        var values = [1, 2, 3];
+        var a = [,,,...values, 4, 5, 6];
+    }
+    expect: {
+        var values = [1, 2, 3];
+        var a = [,,,...values, 4, 5, 6];
+    }
+}
+
+spread_with_array_at_end: {
+    input: {
+        var a = [1, 2, ...[4, 5, 6]];
+    }
+    expect: {
+        var a = [1, 2, ...[4, 5, 6]];
+    }
+}
+
+spread_with_logical_expression_at_end: {
+    options = { evaluate: true }
+    input: {
+        var a = [1, 2, 3, ...[2+2]]
+    }
+    expect: {
+        var a = [1, 2, 3, ...[4]]
+    }
+}
+
+spread_with_logical_expression_at_middle: {
+    options = { evaluate: true }
+    input: {
+        var a = [1, 1, ...[1+1, 1+2, 2+3], 8]
+    }
+    expect: {
+        var a = [1, 1, ...[2, 3, 5], 8]
+    }
+}

test/compress/arrow.js

@@ -0,0 +1,128 @@
+arrow_functions_without_body: {
+    input: {
+        var a1 = () => 42;
+        var a2 = (p) => p;
+        var a3 = p => p;
+        var a4 = (...p) => p;
+        var a5 = (b, c) => b + c;
+        var a6 = (b, ...c) => b + c[0];
+        var a7 = (...b) => b.join();
+    }
+    expect: {
+        var a1 = () => 42;
+        var a2 = (p) => p;
+        var a3 = p => p;
+        var a4 = (...p) => p;
+        var a5 = (b, c) => b + c;
+        var a6 = (b, ...c) => b + c[0];
+        var a7 = (...b) => b.join();
+    }
+}
+
+arrow_functions_with_body: {
+    input: {
+        var a1 = () => {
+            var a = 42 * Math.random();
+            return a;
+        };
+        var a2 = (p) => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a3 = p => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a4 = (...p) => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a5 = (b, c) => {
+            var result = b * c + b / c;
+            return result
+        };
+        var a6 = (b, ...c) => {
+            var result = b;
+            for (var i = 0; i < c.length; i++)
+                result += c[i];
+            return result
+        };
+        var a7 = (...b) => {
+            b.join();
+        }
+    }
+    expect: {
+        var a1 = () => {
+            var a = 42 * Math.random();
+            return a;
+        };
+        var a2 = (p) => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a3 = p => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a4 = (...p) => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a5 = (b, c) => {
+            var result = b * c + b / c;
+            return result
+        };
+        var a6 = (b, ...c) => {
+            var result = b;
+            for (var i = 0; i < c.length; i++)
+                result += c[i];
+            return result
+        };
+        var a7 = (...b) => {
+            b.join();
+        };
+    }
+}
+
+arrow_function_with_single_parameter_with_default: {
+    input: {
+        var foo = (a = 0) => doSomething(a);
+    }
+    expect_exact: "var foo=(a=0)=>doSomething(a);"
+}
+
+arrow_binding_pattern: {
+    input: {
+        var foo = ([]) => "foo";
+        var bar = ({}) => "bar";
+        var with_default = (foo = "default") => foo;
+        var object_with_default = ({foo = "default", bar: baz = "default"}) => foo;
+        var array_after_spread = (...[foo]) => foo;
+        var array_after_spread = (...{foo}) => foo;
+        var computed = ({ [compute()]: x }) => {};
+        var array_hole = ([, , ...x] = [1, 2]) => {};
+        var object_trailing_elision = ({foo,}) => {};
+        var spread_empty_array = (...[]) => "foo";
+        var spread_empty_object = (...{}) => "foo";
+    }
+    expect: {
+        var foo = ([]) => "foo";
+        var bar = ({}) => "bar";
+        var with_default = (foo = "default") => foo;
+        var object_with_default = ({foo = "default", bar: baz = "default"}) => foo;
+        var array_after_spread = (...[foo]) => foo;
+        var array_after_spread = (...{foo}) => foo;
+        var computed = ({ [compute()]: x }) => {};
+        var array_hole = ([, , ...x] = [1, 2]) => {};
+        var object_trailing_elision = ({foo,}) => {};
+        var spread_empty_array = (...[]) => "foo";
+        var spread_empty_object = (...{}) => "foo";
+    }
+}
+
+arrow_binding_pattern_strict: {
+    input: {
+        var foo = ([,]) => "foo";
+    }
+    expect_exact: 'var foo=([,])=>"foo";'
+}

test/compress/block-scope.js

@@ -0,0 +1,174 @@
+
+let_statement: {
+    input: {
+        let x = 6;
+    }
+    expect_exact: "let x=6;"
+}
+
+do_not_hoist_let: {
+    options = {
+        hoist_vars: true,
+    };
+    input: {
+        function x() {
+            if (FOO) {
+                let let1;
+                let let2;
+                var var1;
+                var var2;
+            }
+        }
+    }
+    expect: {
+        function x() {
+            var var1, var2;
+            if (FOO) {
+                let let1;
+                let let2;
+            }
+        }
+    }
+}
+
+do_not_remove_anon_blocks_if_they_have_decls: {
+    input: {
+        function x() {
+            {
+                let x;
+            }
+            {
+                var x;
+            }
+            {
+                const y;
+                class Zee {};
+            }
+        }
+        {
+            let y;
+        }
+        {
+            var y;
+        }
+    }
+    expect: {
+        function x(){
+            {
+                let x
+            }
+            var x;
+            {
+                const y;
+                class Zee {}
+            }
+        }
+        {
+            let y
+        }
+        var y;
+    }
+}
+
+remove_unused_in_global_block: {
+    options = {
+        unused: true,
+    }
+    input: {
+        {
+            let x;
+            const y;
+            class Zee {};
+            var w;
+        }
+        let ex;
+        const why;
+        class Zed {};
+        var wut;
+        console.log(x, y, Zee);
+    }
+    expect: {
+        var w;
+        var wut;
+        console.log(x, y, Zee);
+    }
+}
+
+regression_block_scope_resolves: {
+    mangle = { };
+    options = {
+        dead_code: false
+    };
+    input: {
+        (function () {
+            if(1) {
+                let x;
+                const y;
+                class Zee {};
+            }
+            if(1) {
+                let ex;
+                const why;
+                class Zi {};
+            }
+            console.log(x, y, Zee, ex, why, Zi);
+        }());
+    }
+    expect: {
+        (function () {
+            if (1) {
+                let o;
+                const n;
+                class c {};
+            }
+            if (1) {
+                let o;
+                const n;
+                class c {};
+            }
+            console.log(x, y, Zee, ex, why, Zi);
+        }());
+    }
+}
+
+switch_block_scope_mangler: {
+    mangle = {}
+    input: {
+        var fn = function(code) {
+            switch (code) {
+                case 1:
+                    let apple = code + 1;
+                    let dog = code + 4;
+                    console.log(apple, dog);
+                    break;
+                case 2:
+                    let banana = code + 2;
+                    console.log(banana);
+                    break;
+                default:
+                    let cat = code + 3;
+                    console.log(cat);
+            }
+        };
+    }
+    expect: {
+        var fn = function(o) {
+            switch (o) {
+              case 1:
+                let e = o + 1
+                let c = o + 4;
+                console.log(e, c);
+                break;
+
+              case 2:
+                let l = o + 2;
+                console.log(l);
+                break;
+
+              default:
+                let a = o + 3;
+                console.log(a);
+            }
+        };
+    }
+}

test/compress/collapse_vars.js

@@ -338,9 +338,8 @@ 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:"keep_assign",
-        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:true, hoist_funs:true,
+        keep_fargs:true, if_return:true, join_vars:true, cascade:true, side_effects:true
     }
     input: {
         function f1(y) {
@@ -410,79 +409,6 @@ 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 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) {
-            do ; while (false);
-        }
-        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,
@@ -641,9 +567,8 @@ 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:"keep_assign",
-        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: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; }
@@ -668,38 +593,7 @@ 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; }
     }
 }
 

test/compress/concat-strings.js

@@ -24,143 +24,3 @@ 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"
-        );
-    }
-}

test/compress/conditionals.js

@@ -50,8 +50,7 @@ ifs_3_should_warn: {
         conditionals : true,
         dead_code    : true,
         evaluate     : true,
-        booleans     : true,
-        side_effects : true,
+        booleans     : true
     };
     input: {
         var x, y;
@@ -136,28 +135,16 @@ ifs_6: {
         comparisons: true
     };
     input: {
-        var x, y;
+        var x;
         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, y;
+        var x;
         x = foo || bar || baz || boo ? 20 : 10;
-        x[foo] = y ? 10 : 20;
-        foo ? x[bar] = 10 : x[bar] = 20;
     }
 }
 
@@ -172,16 +159,10 @@ 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);
     }
 }
 
@@ -232,16 +213,10 @@ 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();
     }
 }
 
@@ -275,8 +250,7 @@ cond_5: {
 cond_7: {
     options = {
         conditionals: true,
-        evaluate    : true,
-        side_effects: true,
+        evaluate    : true
     };
     input: {
         var x, y, z, a, b;
@@ -661,6 +635,166 @@ 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,
@@ -740,7 +874,6 @@ issue_1154: {
         conditionals: true,
         evaluate    : true,
         booleans    : true,
-        side_effects: true,
     };
     input: {
         function f1(x) { return x ? -1 : -1; }
@@ -769,31 +902,7 @@ issue_1154: {
         function g2() { return g(), 2; }
         function g3() { return g(), -4; }
         function g4() { return g(), !1; }
-        function g5() { return void g(); }
+        function g5() { return g(), void 0; }
         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

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

test/compress/dead-code.js

@@ -64,8 +64,7 @@ dead_code_constant_boolean_should_warn_more: {
         loops        : true,
         booleans     : true,
         conditionals : true,
-        evaluate     : true,
-        side_effects : true,
+        evaluate     : true
     };
     input: {
         while (!((foo && bar) || (x + "0"))) {
@@ -89,14 +88,35 @@ dead_code_constant_boolean_should_warn_more: {
     }
 }
 
+dead_code_block_decls_die: {
+    options = {
+        dead_code    : true,
+        conditionals : true,
+        booleans     : true,
+        evaluate     : true
+    };
+    input: {
+        if (0) {
+            let foo = 6;
+            const bar = 12;
+            class Baz {};
+            var qux;
+        }
+        console.log(foo, bar, Baz);
+    }
+    expect: {
+        var qux;
+        console.log(foo, bar, Baz);
+    }
+}
+
 dead_code_const_declaration: {
     options = {
         dead_code    : true,
         loops        : true,
         booleans     : true,
         conditionals : true,
-        evaluate     : true,
-        reduce_vars  : true,
+        evaluate     : true
     };
     input: {
         var unused;
@@ -121,8 +141,7 @@ dead_code_const_annotation: {
         loops        : true,
         booleans     : true,
         conditionals : true,
-        evaluate     : true,
-        reduce_vars  : true,
+        evaluate     : true
     };
     input: {
         var unused;
@@ -170,8 +189,7 @@ dead_code_const_annotation_complex_scope: {
         loops        : true,
         booleans     : true,
         conditionals : true,
-        evaluate     : true,
-        reduce_vars  : true,
+        evaluate     : true
     };
     input: {
         var unused_var;
@@ -205,5 +223,6 @@ 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

@@ -0,0 +1,106 @@
+destructuring_arrays: {
+    input: {
+        {const [aa, bb] = cc;}
+        {const [aa, [bb, cc]] = dd;}
+        {let [aa, bb] = cc;}
+        {let [aa, [bb, cc]] = dd;}
+        var [aa, bb] = cc;
+        var [aa, [bb, cc]] = dd;
+        var [,[,,,,,],,,zz,] = xx; // Trailing comma
+        var [,,zzz,,] = xxx; // Trailing comma after hole
+    }
+    expect: {
+        {const [aa, bb] = cc;}
+        {const [aa, [bb, cc]] = dd;}
+        {let [aa, bb] = cc;}
+        {let [aa, [bb, cc]] = dd;}
+        var [aa, bb] = cc;
+        var [aa, [bb, cc]] = dd;
+        var [,[,,,,,],,,zz] = xx;
+        var [,,zzz,,] = xxx;
+    }
+}
+
+destructuring_arrays_holes: {
+    input: {
+        var [,,,,] = a;
+        var [,,b,] = c;
+        var [d,,]  = e;
+    }
+    expect_exact: "var[,,,,]=a;var[,,b]=c;var[d,,]=e;"
+}
+
+destructuring_objects: {
+    input: {
+        {const {aa, bb} = {aa:1, bb:2};}
+        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        {let {aa, bb} = {aa:1, bb:2};}
+        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        var {aa, bb} = {aa:1, bb:2};
+        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
+    }
+    expect: {
+        {const {aa, bb} = {aa:1, bb:2};}
+        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        {let {aa, bb} = {aa:1, bb:2};}
+        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        var {aa, bb} = {aa:1, bb:2};
+        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
+    }
+}
+
+destructuring_objects_trailing_elision: {
+    input: {
+        var {cc,} = foo;
+    }
+    expect_exact: "var{cc}=foo;"
+}
+
+nested_destructuring_objects: {
+    input: {
+        const [{a},b] = c;
+        let [{a},b] = c;
+        var [{a},b] = c;
+    }
+    expect_exact: 'const[{a},b]=c;let[{a},b]=c;var[{a},b]=c;';
+}
+
+destructuring_constdef_in_loops: {
+    input: {
+        for (const [x,y] in pairs);
+        for (const [a] = 0;;);
+        for (const {c} of cees);
+    }
+    expect_exact: "for(const[x,y]in pairs);for(const[a]=0;;);for(const{c}of cees);"
+}
+
+destructuring_letdef_in_loops: {
+    input: {
+        for (let [x,y] in pairs);
+        for (let [a] = 0;;);
+        for (let {c} of cees);
+    }
+    expect_exact: "for(let[x,y]in pairs);for(let[a]=0;;);for(let{c}of cees);"
+}
+
+destructuring_vardef_in_loops: {
+    input: {
+        for (var [x,y] in pairs);
+        for (var [a] = 0;;);
+        for (var {c} of cees);
+    }
+    expect_exact: "for(var[x,y]in pairs);for(var[a]=0;;);for(var{c}of cees);"
+}
+
+destructuring_expressions: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        ({a, b});
+        [{a}];
+        f({x});
+    }
+    expect_exact: "({a,b});[{a}];f({x});"
+}
+

test/compress/directives.js

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

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_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;
-    }
-}
+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;
+    }
+}

test/compress/drop-unused.js

@@ -164,6 +164,87 @@ used_var_in_catch: {
     }
 }
 
+unused_block_decls_in_catch: {
+    options = { unused: true };
+    input: {
+        function foo() {
+            try {
+                foo();
+            } catch(ex) {
+                let x = 10;
+                const y = 10;
+                class Zee {};
+            }
+        }
+    }
+    expect: {
+        function foo() {
+            try {
+                foo();
+            } catch(ex) {}
+        }
+    }
+}
+
+used_block_decls_in_catch: {
+    options = { unused: true };
+    input: {
+        function foo() {
+            try {
+                foo();
+            } catch(ex) {
+                let x = 10;
+                const y = 10;
+                class Zee {};
+            }
+            console.log(x, y, Zee);
+        }
+    }
+    expect: {
+        function foo() {
+            try {
+                foo();
+            } catch(ex) {}
+            console.log(x, y, Zee);
+        }
+    }
+}
+
+unused_block_decls: {
+    options = { unused: true };
+    input: {
+        function foo() {
+            {
+                const x;
+            }
+            {
+                let y;
+            }
+            console.log(x, y);
+        }
+    }
+    expect: {
+        function foo() {
+            console.log(x, y);
+        }
+    }
+}
+
+unused_keep_harmony_destructuring: {
+    options = { unused: true };
+    input: {
+        function foo() {
+            var {x, y} = foo;
+            var a = foo;
+        }
+    }
+    expect:  {
+        function foo() {
+            var {x, y} = foo;
+        }
+    }
+}
+
 keep_fnames: {
     options = { unused: true, keep_fnames: true, unsafe: true };
     input: {
@@ -177,505 +258,3 @@ 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() {
-            ~function() {}(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;
-        }
-    }
-}

test/compress/evaluate.js

@@ -1,187 +1,3 @@
-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: {
@@ -222,463 +38,90 @@ positive_zero: {
     }
 }
 
-unsafe_constant: {
-    options = {
-        evaluate  : true,
-        unsafe    : true
-    }
+pow: {
+    options = { evaluate: true }
     input: {
-        console.log(
-            true.a,
-            false.a,
-            null.a,
-            undefined.a
-        );
+        var a = 5 ** 3;
     }
     expect: {
-        console.log(
-            true.a,
-            false.a,
-            null.a,
-            (void 0).a
-        );
+        var a = 125;
     }
 }
 
-unsafe_object: {
+pow_sequence: {
     options = {
-        evaluate  : true,
-        unsafe    : true
+        evaluate: true
     }
     input: {
-        console.log(
-            ({a:1}) + 1,
-            ({a:1}).a + 1,
-            ({a:1}).b + 1,
-            ({a:1}).a.b + 1
-        );
+        var a = 2 ** 3 ** 2;
     }
     expect: {
-        console.log(
-            ({a:1}) + 1,
-            2,
-            ({a:1}).b + 1,
-            1..b + 1
-        );
+        var a = 512;
     }
 }
 
-unsafe_object_nested: {
+pow_mixed: {
     options = {
-        evaluate  : true,
-        unsafe    : true
+        evaluate: true
     }
     input: {
-        console.log(
-            ({a:{b:1}}) + 1,
-            ({a:{b:1}}).a + 1,
-            ({a:{b:1}}).b + 1,
-            ({a:{b:1}}).a.b + 1
-        );
+        var a = 5 + 2 ** 3 + 5;
+        var b = 5 * 3 ** 2;
+        var c = 5 ** 3 * 2;
+        var d = 5 ** +3;
     }
     expect: {
-        console.log(
-            ({a:{b:1}}) + 1,
-            ({a:{b:1}}).a + 1,
-            ({a:{b:1}}).b + 1,
-            2
-        );
+        var a = 18;
+        var b = 45;
+        var c = 250;
+        var d = 125;
     }
 }
 
-unsafe_object_complex: {
+pow_with_right_side_evaluating_to_unary: {
     options = {
-        evaluate  : true,
-        unsafe    : true
+        evaluate: 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
-        );
+        var a = (4 - 7) ** foo;
+        var b = ++bar ** 3;
+        var c = --baz ** 2;
     }
+    expect_exact: "var a=(-3)**foo;var b=++bar**3;var c=--baz**2;"
 }
 
-unsafe_object_repeated: {
+pow_with_number_constants: {
     options = {
-        evaluate  : true,
-        unsafe    : true
+        evaluate: 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
-        );
+        var a = 5 ** NaN; /* NaN exponent results to NaN */
+        var b = 42 ** +0; /* +0 exponent results to NaN */
+        var c = 42 ** -0; /* -0 exponent results to NaN */
+        var d = NaN ** 1; /* NaN with non-zero exponent is NaN */
+        var e = 2 ** Infinity; /* abs(base) > 1 with Infinity as exponent is Infinity */
+        var f = 2 ** -Infinity; /* abs(base) > 1 with -Infinity as exponent is +0 */
+        var g = (-7) ** (0.5);
+        var h = 2324334 ** 34343443;
+        var i = (-2324334) ** 34343443;
+        var j = 2 ** (-3);
+        var k = 2.0 ** -3;
+        var l = 2.0 ** (5 - 7);
+        var m = 3 ** -10;  // Result will be 0.000016935087808430286, which is too long
     }
     expect: {
-        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);
-        +function(a) {
-            return 1;
-        }(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)
-        );
+        var a = NaN;
+        var b = 1;
+        var c = 1;
+        var d = NaN;
+        var e = Infinity;
+        var f = 0;
+        var g = NaN;
+        var h = Infinity;
+        var i = -Infinity;
+        var j = .125;
+        var k = .125;
+        var l = .25;
+        var m = 3 ** -10;
     }
 }

test/compress/expansions.js

@@ -0,0 +1,28 @@
+
+expand_arguments: {
+    input: {
+        func(a, ...rest);
+        func(...all);
+    }
+    expect_exact: "func(a,...rest);func(...all);"
+}
+
+expand_expression_arguments: {
+    input: {
+        f(...a.b);
+        f(...a.b());
+        f(...(a));
+        f(...(a.b));
+        f(...a[i]);
+    }
+    expect_exact: "f(...a.b);f(...a.b());f(...a);f(...a.b);f(...a[i]);"
+}
+
+expand_parameters: {
+    input: {
+        (function (a, ...b){});
+        (function (...args){});
+    }
+    expect_exact: "(function(a,...b){});(function(...args){});"
+}
+

test/compress/expression.js

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

test/compress/functions.js

@@ -1,8 +0,0 @@
-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){})();"
-}

test/compress/global_defs.js

@@ -1,147 +0,0 @@
-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

@@ -0,0 +1,288 @@
+arrow_function_parens: {
+    input: {
+        something && (() => {});
+    }
+    expect_exact: "something&&(()=>{});"
+}
+arrow_function_parens_2: {
+    input: {
+        (() => null)();
+    }
+    expect_exact: "(()=>null)();"
+}
+
+typeof_arrow_functions: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        var foo = typeof (x) => null;
+    }
+    expect_exact: "var foo=\"function\";"
+}
+
+classes: {
+    input: {
+        class SomeClass {
+            constructor() {
+            };
+            foo() {};
+        };
+        class NoSemi {
+            constructor(...args) {
+            }
+            foo() {}
+        };
+        class ChildClass extends SomeClass {};
+        var asExpression = class AsExpression {};
+        var nameless = class {};
+    }
+    expect_exact: "class SomeClass{constructor(){}foo(){}}class NoSemi{constructor(...args){}foo(){}}class ChildClass extends SomeClass{}var asExpression=class AsExpression{};var nameless=class{};"
+}
+
+class_statics: {
+    input: {
+        x = class {
+            static staticMethod() {}
+            static get foo() {}
+            static set bar() {}
+            static() { /* "static" can be a method name! */ }
+            get() { /* "get" can be a method name! */ }
+            set() { /* "set" can be a method name! */ }
+        }
+    }
+    expect_exact: "x=class{static staticMethod(){}static get foo(){}static set bar(){}static(){}get(){}set(){}};"
+}
+
+class_name_can_be_mangled: {
+    mangle = { };
+    input: {
+        function x() {
+            class Foo {
+            }
+            var class1 = Foo
+            var class2 = class Bar {}
+        }
+    }
+    expect: {
+        function x() {
+            class a { }
+            var n = a
+            var r = class a {}
+        }
+    }
+}
+
+class_name_can_be_preserved: {
+    mangle = {
+        keep_classnames: true
+    }
+    input: {
+        function x() {
+            (class Baz { });
+            class Foo {};
+        }
+    }
+    expect: {
+        function x() {
+            (class Baz { });
+            class Foo {};
+        }
+    }
+}
+
+classes_can_have_generators: {
+    input: {
+        class Foo {
+            *bar() {}
+            static *baz() {}
+        }
+    }
+    expect: {
+        class Foo {
+            *bar() {}
+            static *baz() {}
+        }
+    }
+}
+
+classes_can_have_computed_generators: {
+    input: {
+        class C4 {
+            *['constructor']() {}
+        }
+    }
+    expect: {
+        class C4 {
+            *['constructor']() {}
+        }
+    }
+}
+
+classes_can_have_computed_static: {
+    input: {
+        class C4 {
+            static ['constructor']() {}
+        }
+    }
+    expect: {
+        class C4 {
+            static ['constructor']() {}
+        }
+    }
+}
+
+class_methods_and_getters_with_keep_quoted_props_enabled: {
+    beautify = {
+        quote_style: 3,
+        keep_quoted_props: true,
+    }
+    input: {
+        class clss {
+            a() {}
+            "b"() {}
+            get c() { return "c"}
+            get "d"() { return "d"}
+            set e(a) { doSomething(a); }
+            set 'f'(a) { doSomething(b); }
+            static g() {}
+            static "h"() {}
+        }
+    }
+    expect_exact: 'class clss{a(){}"b"(){}get c(){return"c"}get"d"(){return"d"}set e(a){doSomething(a)}set\'f\'(a){doSomething(b)}static g(){}static"h"(){}}'
+}
+
+new_target: {
+    input: {
+        new.target;
+        new.target.name;
+    }
+    expect_exact: "new.target;new.target.name;"
+}
+
+number_literals: {
+    input: {
+        0b1001;
+        0B1001;
+        0o11;
+        0O11;
+    }
+
+    expect: {
+        9;
+        9;
+        9;
+        9;
+    }
+}
+
+import_statement: {
+    input: {
+        import "mod-name";
+        import Foo from "bar";
+        import { Bar, Baz } from 'lel';
+        import Bar, { Foo } from 'lel';
+        import { Bar as kex, Baz as food } from 'lel';
+    }
+    expect_exact: "import\"mod-name\";import Foo from\"bar\";import{Bar,Baz}from\"lel\";import Bar,{Foo}from\"lel\";import{Bar as kex,Baz as food}from\"lel\";"
+}
+
+export_statement: {
+    input: {
+        export default 1;
+        export var foo = 4;
+        export let foo = 6;
+        export const foo = 6;
+        export function foo() {};
+        export class foo { };
+    }
+    expect_exact: "export default 1;export var foo=4;export let foo=6;export const foo=6;export function foo(){};export class foo{};"
+}
+
+import_statement_mangling: {
+    mangle = { };
+    input: {
+        import Foo from "foo";
+        import Bar, {Food} from "lel";
+        import {What as Whatever} from "lel";
+        Foo();
+        Bar();
+        Food();
+        Whatever();
+    }
+    expect: {
+        import l from "foo";
+        import e, {Food as o} from "lel";
+        import {What as f} from "lel";
+        l();
+        e();
+        o();
+        f();
+    }
+}
+
+export_statement_mangling: {
+    mangle = { };
+    input: {
+        export var foo = 6;
+        export function bar() { }
+        export class Baz { }
+        bar(foo, Baz)
+    }
+    expect: {
+        export var foo = 6;
+        export function bar() { }
+        export class Baz { }
+        bar(foo, Baz)
+    }
+}
+
+// https://github.com/mishoo/UglifyJS2/issues/1021
+regression_for_of_const: {
+    input: {
+        for (const x of y) {}
+        for (const x in y) {}
+    }
+    expect: {
+        for (const x of y);for (const x in y);
+    }
+}
+
+// Fabio: My patches accidentally caused a crash whenever
+// there's an extraneous set of parens around an object.
+regression_cannot_destructure: {
+    input: {
+        var x = ({ x : 3 });
+        x(({ x: 3 }));
+    }
+    expect_exact: "var x={x:3};x({x:3});";
+}
+
+regression_cannot_use_of: {
+    input: {
+        function of() {
+        }
+        var of = "is a valid variable name";
+        of = { of: "is ok" };
+        x.of;
+        of: foo()
+    }
+    expect: {
+        function of(){}
+        var of="is a valid variable name";
+        of={of:"is ok"};
+        x.of;
+        foo();  /* Label statement missing? No prob. */
+    }
+}
+
+fat_arrow_as_param: {
+    input: {
+        foo(x => x);
+        foo(x => x, y => y);
+
+        foo(x => (x, x));
+        foo(x => (x, x), y => (y, y));
+    }
+    expect_exact: "foo(x=>x);foo(x=>x,y=>y);foo(x=>(x,x));foo(x=>(x,x),y=>(y,y));"
+}

test/compress/hoist.js

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

test/compress/hoist_vars.js

@@ -1,90 +0,0 @@
-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/html_comments.js

@@ -69,3 +69,12 @@ html_comment_in_string_literal: {
     }
     expect_exact: 'function f(){return"\\x3c!--HTML--\\x3ecomment in\\x3c!--string literal--\\x3e"}';
 }
+
+html_comment_after_multiline_comment: {
+    input: {
+        var foo; /*
+*/-->   var bar;
+        var foobar;
+    }
+    expect_exact: "var foo;var foobar;"
+}

test/compress/if_return.js

@@ -170,51 +170,8 @@ if_return_7: {
         }
     }
     expect: {
-        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)}
+        // suboptimal
+        function f(x){return!!x||(foo(),void bar())}
     }
 }
 
@@ -248,57 +205,3 @@ 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-1001.js

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

test/compress/issue-1041.js

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

test/compress/issue-1043.js

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

test/compress/issue-1044.js

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

test/compress/issue-105.js

@@ -0,0 +1,25 @@
+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-1212.js

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

test/compress/issue-1261.js

@@ -1,176 +0,0 @@
-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((throwing_function(), "yes"));
+                console.log('0' + throwing_function() ? "yes" : "no");
             } catch (ex) {
                 console.log(ex);
             }

test/compress/issue-1431.js

@@ -1,151 +0,0 @@
-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

@@ -1,69 +0,0 @@
-// tests assume that variable `undefined` not redefined and has `void 0` as value
-
-unsafe_undefined: {
-    options = {
-        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() {
-                if (a)
-                    return b;
-                if (c)
-                    return d;
-                else
-                    return n;
-            };
-        }
-    }
-}
-
-keep_fnames: {
-    options = {
-        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;
-                }
-                if (a)
-                    return b;
-                if (c)
-                    return d;
-                else
-                    return r;
-            };
-        }
-    }
-}

test/compress/issue-1446.js

@@ -1,71 +0,0 @@
-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

@@ -1,45 +0,0 @@
-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-203.js

@@ -0,0 +1,30 @@
+
+compress_new_function: {
+    options = {
+        unsafe: true
+    }
+    input: {
+        new Function("aa, bb", 'return aa;');
+    }
+    expect: {
+        Function("a", "b", "return a");
+    }
+}
+
+compress_new_function_with_destruct: {
+    options = {
+        unsafe: true
+    }
+    input: {
+        new Function("aa, [bb]", 'return aa;');
+        new Function("aa, {bb}", 'return aa;');
+        new Function("[[aa]], [{bb}]", 'return aa;');
+    }
+    expect: {
+        Function("a", "[b]", "return a");
+        Function("a", "{bb}", "return a");
+        Function("[[a]]", "[{bb}]", 'return a');
+    }
+}
+
+

test/compress/issue-208.js

@@ -1,70 +1,11 @@
 do_not_update_lhs: {
-    options = {
-        global_defs: { DEBUG: 0 }
-    }
-    input: {
-        DEBUG++;
-        DEBUG += 1;
-        DEBUG = 1;
-    }
-    expect: {
-        DEBUG++;
-        DEBUG += 1;
-        DEBUG = 1;
-    }
+    options = { global_defs: { DEBUG: false } };
+    input: { DEBUG = false; }
+    expect: { DEBUG = false; }
 }
 
 do_update_rhs: {
-    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]',
-    ]
+    options = { global_defs: { DEBUG: false } };
+    input: { MY_DEBUG = DEBUG; }
+    expect: { MY_DEBUG = false; }
 }

test/compress/issue-926.js

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

test/compress/issue-979.js

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

test/compress/join-vars.js

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

test/compress/loops.js

@@ -187,32 +187,3 @@ 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();
-        d();
-    }
-}

test/compress/max_line_len.js

@@ -1,28 +0,0 @@
-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

@@ -10,16 +10,6 @@ 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
@@ -35,7 +25,6 @@ negate_iife_2: {
 negate_iife_3: {
     options = {
         negate_iife: true,
-        conditionals: true
     };
     input: {
         (function(){ return true })() ? console.log(true) : console.log(false);
@@ -45,23 +34,9 @@ negate_iife_3: {
     }
 }
 
-negate_iife_3_off: {
-    options = {
-        negate_iife: false,
-        conditionals: true,
-    };
-    input: {
-        (function(){ return true })() ? console.log(true) : console.log(false);
-    }
-    expect: {
-        !function(){ return true }() ? console.log(false) : console.log(true);
-    }
-}
-
-negate_iife_4: {
+negate_iife_3: {
     options = {
         negate_iife: true,
-        conditionals: true,
         sequences: true
     };
     input: {
@@ -77,42 +52,7 @@ negate_iife_4: {
     }
 }
 
-sequence_off: {
-    options = {
-        negate_iife: false,
-        conditionals: true,
-        sequences: true,
-        passes: 2,
-    };
-    input: {
-        function f() {
-            (function(){ return true })() ? console.log(true) : console.log(false);
-            (function(){
-                console.log("something");
-            })();
-        }
-        function g() {
-            (function(){
-                console.log("something");
-            })();
-            (function(){ return true })() ? console.log(true) : console.log(false);
-        }
-    }
-    expect: {
-        function f() {
-            !function(){ return true }() ? console.log(false) : console.log(true), function(){
-                console.log("something");
-            }();
-        }
-        function g() {
-            (function(){
-                console.log("something");
-            })(), function(){ return true }() ? console.log(true) : console.log(false);
-        }
-    }
-}
-
-negate_iife_5: {
+negate_iife_4: {
     options = {
         negate_iife: true,
         sequences: true,
@@ -135,29 +75,6 @@ negate_iife_5: {
     }
 }
 
-negate_iife_5_off: {
-    options = {
-        negate_iife: false,
-        sequences: true,
-        conditionals: true,
-    };
-    input: {
-        if ((function(){ return true })()) {
-            foo(true);
-        } else {
-            bar(false);
-        }
-        (function(){
-            console.log("something");
-        })();
-    }
-    expect: {
-        !function(){ return true }() ? bar(false) : foo(true), function(){
-            console.log("something");
-        }();
-    }
-}
-
 negate_iife_nested: {
     options = {
         negate_iife: true,
@@ -190,38 +107,6 @@ 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,
@@ -287,36 +172,3 @@ 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);
-    }
-}

test/compress/object.js

@@ -0,0 +1,504 @@
+getter_setter: {
+    input: {
+        var get = "bar";
+        var a = {
+            get,
+            set: "foo",
+            get bar() {
+                return this.get;
+            },
+            get 5() {
+                return "five";
+            },
+            get 0xf55() {
+                return "f five five";
+            },
+            get "five"() {
+                return 5;
+            },
+            set one(value) {
+                this._one = value;
+            },
+            set 9(value) {
+                this._nine = value;
+            },
+            set 0b1010(value) {
+                this._ten = value;
+            },
+            set "eleven"(value) {
+                this._eleven = value;
+            }
+        };
+        var b = {
+            get() { return "gift"; },
+            set: function(code) { return "Storing code " + code; }
+        };
+        var c = {
+            ["get"]: "foo",
+            ["set"]: "bar"
+        };
+        var d = {
+            get: "foo",
+            set: "bar"
+        };
+    }
+    expect: {
+        var get = "bar";
+        var a = {
+            get,
+            set: "foo",
+            get bar() {
+                return this.get;
+            },
+            get 5() {
+                return "five";
+            },
+            get 0xf55() {
+                return "f five five";
+            },
+            get "five"() {
+                return 5;
+            },
+            set one(value) {
+                this._one = value;
+            },
+            set 9(value) {
+                this._nine = value;
+            },
+            set 0b1010(value) {
+                this._ten = value;
+            },
+            set "eleven"(value) {
+                this._eleven = value;
+            }
+        };
+        var b = {
+            get() { return "gift"; },
+            set: function(code) { return "Storing code " + code; }
+        };
+        var c = {
+            ["get"]: "foo",
+            ["set"]: "bar"
+        };
+        var d = {
+            get: "foo",
+            set: "bar"
+        };
+    }
+}
+
+getter_setter_mangler: {
+    mangle = {}
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        function f(get,set) {
+            return {
+                get,
+                set,
+                get g(){},
+                set s(n){},
+                c,
+                a:1,
+                m(){}
+            };
+        }
+    }
+    expect_exact: "function f(n,t){return{get:n,set:t,get g(){},set s(n){},c,a:1,m(){}}}"
+}
+
+use_shorthand_opportunity: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        var foo = 123;
+        var obj = {foo: foo};
+    }
+    expect_exact: "var foo=123;var obj={foo};"
+}
+
+computed_property_names: {
+    input: {
+        obj({ ["x" + "x"]: 6 });
+    }
+    expect_exact: 'obj({["x"+"x"]:6});'
+}
+
+computed_property_names_evaluated_1: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        obj({
+            [1 + 1]: 2,
+            ["x" + "x"]: 6
+        });
+    }
+    expect_exact: 'obj({[2]:2,["xx"]:6});'
+}
+
+computed_property_names_evaluated_2: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        var foo = something();
+
+        var obj = {
+            [foo]() {
+                return "blah";
+            }
+        }
+    }
+    expect_exact: 'var foo=something();var obj={[foo](){return"blah"}};'
+}
+
+shorthand_properties: {
+    mangle = true;
+    input: (function() {
+        var prop = 1;
+        const value = {prop};
+        return value;
+    })();
+    expect: (function() {
+        var n = 1;
+        const r = {prop:n};
+        return r;
+    })();
+}
+
+concise_methods: {
+    input: {
+        x = {
+            foo(a, b) {
+                return x;
+            }
+        }
+        y = {
+            foo([{a}]) {
+                return a;
+            },
+            bar(){}
+        }
+    }
+    expect_exact: "x={foo(a,b){return x}};y={foo([{a}]){return a},bar(){}};"
+}
+
+concise_methods_with_computed_property: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        var foo = {
+            [Symbol.iterator]() {
+                return { /* stuff */ }
+            },
+            [1 + 2]() {
+                return 3;
+            },
+            ["1" + "4"]() {
+                return 14;
+            }
+        }
+    }
+    expect: {
+        var foo = {
+            [Symbol.iterator]() {
+                return { /* stuff */ }
+            },
+            [3]() {
+                return 3;
+            },
+            ["14"]() {
+                return 14;
+            }
+        }
+    }
+}
+
+concise_methods_with_computed_property2: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        var foo = {
+            [[1]](){
+                return "success";
+            }
+        };
+        doSomething(foo[[1]]());
+    }
+    expect_exact: {
+        'var foo={[[1]](){return"success"}};doSomething(foo[[1]]());'
+    }
+}
+
+concise_methods_with_various_property_names: {
+    input: {
+        var get = "bar";
+        var a = {
+            bar() {
+                return this.get;
+            },
+            5() {
+                return "five";
+            },
+            0xf55() {
+                return "f five five";
+            },
+            "five"() {
+                return 5;
+            },
+            0b1010(value) {
+                this._ten = value;
+            }
+        };
+    }
+    expect: {
+        var get = "bar";
+        var a = {
+            bar() {
+                return this.get;
+            },
+            5() {
+                return "five";
+            },
+            0xf55() {
+                return "f five five";
+            },
+            "five"() {
+                return 5;
+            },
+            0b1010(value) {
+                this._ten = value;
+            }
+        };
+    }
+}
+
+concise_methods_and_mangle_props: {
+    mangle_props = {
+        regex: /_/
+    };
+    input: {
+        function x() {
+            obj = {
+                _foo() { return 1; }
+            }
+        }
+    }
+    expect: {
+        function x() {
+            obj = {
+                a() { return 1; }
+            }
+        }
+    }
+}
+
+concise_generators: {
+    input: {
+        x = {
+            *foo(a, b) {
+                return x;
+            }
+        }
+        y = {
+            *foo([{a}]) {
+                yield a;
+            },
+            bar(){}
+        }
+    }
+    expect_exact: "x={*foo(a,b){return x}};y={*foo([{a}]){yield a},bar(){}};"
+}
+
+concise_methods_and_keyword_names: {
+    input: {
+        x = {
+            catch() {},
+            throw() {}
+        }
+    }
+    expect: {
+        x={catch(){},throw(){}};
+    }
+}
+
+getter_setter_with_computed_value: {
+    input: {
+        class C {
+            get ['a']() {
+                return 'A';
+            }
+            set ['a'](value) {
+                do_something(a);
+            }
+        }
+        var x = {
+            get [a.b]() {
+                return 42;
+            }
+        };
+        class MyArray extends Array {
+            get [Symbol.species]() {
+                return Array;
+            }
+        }
+    }
+    expect_exact: 'class C{get["a"](){return"A"}set["a"](value){do_something(a)}}var x={get[a.b](){return 42}};class MyArray extends Array{get[Symbol.species](){return Array}}'
+}
+
+property_with_operator_value: {
+    input: {
+        var foo = {
+            "*": 1,
+            get "*"() {
+                return 2;
+            },
+            *"*"() {
+                return 3;
+            },
+            "%": 1,
+            get "%"() {
+                return 2;
+            },
+            *"%"() {
+                return 3;
+            }
+        }
+        class bar {
+            get "*"() {
+                return 1
+            }
+            *"*"() {
+                return 2;
+            }
+            get "%"() {
+                return 1
+            }
+            *"%"() {
+                return 2;
+            }
+        }
+    }
+    expect_exact: 'var foo={"*":1,get"*"(){return 2},*"*"(){return 3},"%":1,get"%"(){return 2},*"%"(){return 3}};class bar{get"*"(){return 1}*"*"(){return 2}get"%"(){return 1}*"%"(){return 2}}'
+}
+
+property_with_unprintable: {
+    input: {
+        var foo = {
+            "\x00\x01": "foo",
+            get "\x00\x01"() {
+                return "bar";
+            },
+            set "\x00\x01"(foo) {
+                save(foo);
+            },
+            *"\x00\x01"() {
+                return "foobar";
+            }
+        }
+        class bar {
+            get "\x00\x01"() {
+                return "bar"
+            }
+            set "\x00\x01"(foo) {
+                save(foo);
+            }
+            *"\x00\x01"() {
+                return "foobar";
+            }
+        }
+    }
+    expect_exact: 'var foo={"\\0\x01":"foo",get"\\0\x01"(){return"bar"},set"\\0\x01"(foo){save(foo)},*"\\0\x01"(){return"foobar"}};class bar{get"\\0\x01"(){return"bar"}set"\\0\x01"(foo){save(foo)}*"\\0\x01"(){return"foobar"}}'
+}
+
+property_with_unprintable_ascii_only: {
+    beautify = {
+        ascii_only: true,
+    }
+    input: {
+        var foo = {
+            "\x00\x01": "foo",
+            get "\x00\x01"() {
+                return "bar";
+            },
+            set "\x00\x01"(foo) {
+                save(foo);
+            },
+            *"\x00\x01"() {
+                return "foobar";
+            }
+        }
+        class bar {
+            get "\x00\x01"() {
+                return "bar"
+            }
+            set "\x00\x01"(foo) {
+                save(foo);
+            }
+            *"\x00\x01"() {
+                return "foobar";
+            }
+        }
+    }
+    expect_exact: 'var foo={"\\0\\x01":"foo",get"\\0\\x01"(){return"bar"},set"\\0\\x01"(foo){save(foo)},*"\\0\\x01"(){return"foobar"}};class bar{get"\\0\\x01"(){return"bar"}set"\\0\\x01"(foo){save(foo)}*"\\0\\x01"(){return"foobar"}}'
+}
+
+property_with_unprintable_ascii_only_static: {
+    beautify = {
+        ascii_only: true
+    }
+    input: {
+        class foo {
+            static get "\x02\x03"() {
+                return "bar";
+            }
+            static set "\x04\x05"(foo) {
+                save(foo);
+            }
+        }
+    }
+    expect_exact: 'class foo{static get"\\x02\\x03"(){return"bar"}static set"\\x04\\x05"(foo){save(foo)}}'
+}
+
+methods_and_getters_with_keep_quoted_props_enabled: {
+    beautify = {
+        quote_style: 3,
+        keep_quoted_props: true,
+    }
+    input: {
+        var obj = {
+            a() {},
+            "b"() {},
+            get c() { return "c"},
+            get "d"() { return "d"},
+            set e(a) { doSomething(a); },
+            set f(a) { doSomething(b); }
+        }
+    }
+    expect_exact: 'var obj={a(){},"b"(){},get c(){return"c"},get"d"(){return"d"},set e(a){doSomething(a)},set f(a){doSomething(b)}};'
+}
+
+allow_assignments_to_property_values: {
+    input: {
+        var foo = {123: foo = 123} = {foo: "456"};
+    }
+    expect: {
+        var foo = {123: foo = 123} = {foo: "456"};
+    }
+}
+
+variable_as_computed_property: {
+    input: {
+        function getLine(header) {
+            return {
+                [header]: {}
+            };
+        }
+    }
+    expect_exact: "function getLine(header){return{[header]:{}}}"
+}

test/compress/parameters.js

@@ -0,0 +1,159 @@
+arrow_functions: {
+    input: {
+        (a) => b;  // 1 args
+        (a, b) => c;  // n args
+        () => b;  // 0 args
+        (a) => (b) => c;  // func returns func returns func
+        (a) => ((b) => c);  // So these parens are dropped
+        () => (b,c) => d;  // func returns func returns func
+        a=>{return b;}
+        a => 'lel';  // Dropping the parens
+    }
+    expect_exact: "a=>b;(a,b)=>c;()=>b;a=>b=>c;a=>b=>c;()=>(b,c)=>d;a=>{return b};a=>\"lel\";"
+}
+
+regression_arrow_functions_and_hoist: {
+    options = {
+        hoist_vars: true,
+        hoist_funs: true
+    }
+    input: {
+        (a) => b;
+    }
+    expect_exact: "a=>b;"
+}
+
+regression_assign_arrow_functions: {
+    input: {
+        oninstall = e => false;
+        oninstall = () => false;
+    }
+    expect: {
+        oninstall=e=>false;
+        oninstall=()=>false;
+    }
+}
+
+destructuring_arguments_1: {
+    input: {
+        (function ( a ) { });
+        (function ( [ a ] ) { });
+        (function ( [ a, b ] ) { });
+        (function ( [ [ a ] ] ) { });
+        (function ( [ [ a, b ] ] ) { });
+        (function ( [ a, [ b ] ] ) { });
+        (function ( [ [ b ], a ] ) { });
+
+        (function ( { a } ) { });
+        (function ( { a, b } ) { });
+
+        (function ( [ { a } ] ) { });
+        (function ( [ { a, b } ] ) { });
+        (function ( [ a, { b } ] ) { });
+        (function ( [ { b }, a ] ) { });
+
+        ( [ a ] ) => { };
+        ( [ a, b ] ) => { };
+
+        ( { a } ) => { };
+        ( { a, b, c, d, e } ) => { };
+
+        ( [ a ] ) => b;
+        ( [ a, b ] ) => c;
+
+        ( { a } ) => b;
+        ( { a, b } ) => c;
+    }
+    expect: {
+        (function(a){});
+        (function([a]){});
+        (function([a,b]){});
+        (function([[a]]){});
+        (function([[a,b]]){});
+        (function([a,[b]]){});
+        (function([[b],a]){});
+
+        (function({a}){});
+        (function({a,b}){});
+
+        (function([{a}]){});
+        (function([{a,b}]){});
+        (function([a,{b}]){});
+        (function([{b},a]){});
+
+        ([a])=>{};
+        ([a,b])=>{};
+
+        ({a})=>{};
+        ({a,b,c,d,e})=>{};
+
+        ([a])=>b;
+        ([a,b])=>c;
+
+        ({a})=>b;
+        ({a,b})=>c;
+    }
+}
+
+destructuring_arguments_2: {
+    input: {
+        (function([]) {});
+        (function({}) {});
+        (function([,,,,,]) {});
+        (function ([a, {b: c}]) {});
+        (function ([...args]) {});
+        (function ({x,}) {});
+        class a { *method({ [thrower()]: x } = {}) {}};
+        (function(a, b, c, d, [{e: [...f]}]){})(1, 2, 3, 4, [{e: [1, 2, 3]}]);
+    }
+    expect: {
+        (function([]) {});
+        (function({}) {});
+        (function([,,,,,]) {});
+        (function ([a, {b: c}]) {});
+        (function ([...args]) {});
+        (function ({x,}) {});
+        class a { *method({ [thrower()]: x } = {}) {}};
+        (function(a, b, c, d, [{e: [...f]}]){})(1, 2, 3, 4, [{e: [1, 2, 3]}]);
+    }
+}
+
+destructuring_arguments_3: {
+    input: {
+        function fn3({x: {y: {z: {} = 42}}}) {}
+        const { cover = (function () {}), xCover = (0, function() {})  } = {};
+        let { cover = (function () {}), xCover = (0, function() {})  } = {};
+        var { cover = (function () {}), xCover = (0, function() {})  } = {};
+    }
+    expect_exact: "function fn3({x:{y:{z:{}=42}}}){}const{cover=function(){},xCover=(0,function(){})}={};let{cover=function(){},xCover=(0,function(){})}={};var{cover=function(){},xCover=(0,function(){})}={};"
+}
+
+default_arguments: {
+    input: {
+        function x(a = 6) { }
+        function x(a = (6 + 5)) { }
+        function x({ foo } = {}, [ bar ] = [ 1 ]) { }
+    }
+    expect_exact: "function x(a=6){}function x(a=6+5){}function x({foo}={},[bar]=[1]){}"
+}
+
+default_values_in_destructurings: {
+    input: {
+        function x({a=(4), b}) {}
+        function x([b, c=(12)]) {}
+        var { x = (6), y } = x;
+        var [ x, y = (6) ] = x;
+    }
+    expect_exact: "function x({a=4,b}){}function x([b,c=12]){}var{x=6,y}=x;var[x,y=6]=x;"
+}
+
+accept_duplicated_parameters_in_non_strict_without_spread_or_default_assignment: {
+    input: {
+        function a(b, b){}
+        function b({c: test, c: test}){}
+    }
+    expect: {
+        function a(b, b){}
+        function b({c: test, c: test}){}
+    }
+}

test/compress/properties.js

@@ -54,56 +54,7 @@ dot_properties_es5: {
     }
 }
 
-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: {
+evaluate_length: {
     options = {
         properties: true,
         unsafe: true,
@@ -148,7 +99,8 @@ mangle_unquoted_properties: {
         properties: false
     }
     mangle_props = {
-        ignore_quoted: true
+        ignore_quoted: true,
+        reserved: []
     }
     beautify = {
         beautify: false,
@@ -539,19 +491,3 @@ 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

@@ -1,295 +0,0 @@
-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/reduce_vars.js

@@ -108,6 +108,8 @@ modified: {
             }
             console.log(a + b);
             console.log(b + c);
+            // TODO: as "modified" is determined in "figure_out_scope",
+            // even "passes" wouldn't improve this any further
             console.log(a + c);
             console.log(a + b + c);
         }
@@ -134,30 +136,30 @@ modified: {
         }
 
         function f2() {
-            var b = 2;
-            b = 3;
-            console.log(1 + b);
-            console.log(b + 3);
+            var a = 1, b = 2, c = 3;
+            b = c;
+            console.log(a + b);
+            console.log(b + c);
             console.log(4);
-            console.log(1 + b + 3);
+            console.log(a + b + c);
         }
 
         function f3() {
-            var b = 2;
-            b *= 3;
-            console.log(1 + b);
-            console.log(b + 3);
+            var a = 1, b = 2, c = 3;
+            b *= c;
+            console.log(a + b);
+            console.log(b + c);
             console.log(4);
-            console.log(1 + b + 3);
+            console.log(a + b + c);
         }
 
         function f4() {
-            var b = 2, c = 3;
+            var a = 1, b = 2, c = 3;
             b = c;
-            console.log(1 + b);
+            console.log(a + b);
             console.log(b + c);
-            console.log(1 + c);
-            console.log(1 + b + c);
+            console.log(a + c);
+            console.log(a + b + c);
         }
 
         function f5(a) {
@@ -166,307 +168,4 @@ modified: {
             console.log(B ? 'yes' : 'no');
         }
    }
-}
-
-unsafe_evaluate: {
-    options = {
-        evaluate     : true,
-        reduce_vars  : true,
-        unsafe       : true,
-        unused       : true
-    }
-    input: {
-        function f0(){
-            var a = {
-                b:1
-            };
-            console.log(a.b + 3);
-        }
-
-        function f1(){
-            var a = {
-                b:{
-                    c:1
-                },
-                d:2
-            };
-            console.log(a.b + 3, a.d + 4, a.b.c + 5, a.d.c + 6);
-        }
-    }
-    expect: {
-        function f0(){
-            console.log(4);
-        }
-
-        function f1(){
-            var a = {
-                b:{
-                    c:1
-                },
-                d:2
-            };
-            console.log(a.b + 3, 6, 6, 2..c + 6);
-        }
-    }
-}
-
-unsafe_evaluate_object: {
-    options = {
-        evaluate     : true,
-        reduce_vars  : true,
-        unsafe       : true
-    }
-    input: {
-        function f0(){
-            var a = 1;
-            var b = {};
-            b[a] = 2;
-            console.log(a + 3);
-        }
-
-        function f1(){
-            var a = {
-                b:1
-            };
-            a.b = 2;
-            console.log(a.b + 3);
-        }
-    }
-    expect: {
-        function f0(){
-            var a = 1;
-            var b = {};
-            b[1] = 2;
-            console.log(4);
-        }
-
-        function f1(){
-            var a = {
-                b:1
-            };
-            a.b = 2;
-            console.log(a.b + 3);
-        }
-    }
-}
-
-unsafe_evaluate_array: {
-    options = {
-        evaluate     : true,
-        reduce_vars  : true,
-        unsafe       : true
-    }
-    input: {
-        function f0(){
-            var a = 1;
-            var b = [];
-            b[a] = 2;
-            console.log(a + 3);
-        }
-
-        function f1(){
-            var a = [1];
-            a[2] = 3;
-            console.log(a.length);
-        }
-
-        function f2(){
-            var a = [1];
-            a.push(2);
-            console.log(a.length);
-        }
-    }
-    expect: {
-        function f0(){
-            var a = 1;
-            var b = [];
-            b[1] = 2;
-            console.log(4);
-        }
-
-        function f1(){
-            var a = [1];
-            a[2] = 3;
-            console.log(a.length);
-        }
-
-        function f2(){
-            var a = [1];
-            a.push(2);
-            console.log(a.length);
-        }
-    }
-}
-
-unsafe_evaluate_equality: {
-    options = {
-        evaluate     : true,
-        reduce_vars  : true,
-        unsafe       : true,
-        unused       : true
-    }
-    input: {
-        function f0(){
-            var a = {};
-            console.log(a === a);
-        }
-
-        function f1(){
-            var a = [];
-            console.log(a === a);
-        }
-
-        function f2(){
-            var a = {a:1, b:2};
-            var b = a;
-            var c = a;
-            console.log(b === c);
-        }
-
-        function f3(){
-            var a = [1, 2, 3];
-            var b = a;
-            var c = a;
-            console.log(b === c);
-        }
-    }
-    expect: {
-        function f0(){
-            console.log(true);
-        }
-
-        function f1(){
-            console.log(true);
-        }
-
-        function f2(){
-            console.log(true);
-        }
-
-        function f3(){
-            console.log(true);
-        }
-    }
-}
-
-passes: {
-    options = {
-        conditionals: true,
-        evaluate: true,
-        passes: 2,
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        function f() {
-            var a = 1, b = 2, c = 3;
-            if (a) {
-                b = c;
-            } else {
-                c = b;
-            }
-            console.log(a + b);
-            console.log(b + c);
-            console.log(a + c);
-            console.log(a + b + c);
-        }
-    }
-    expect: {
-        function f() {
-            var b = 2;
-            b = 3;
-            console.log(1 + b);
-            console.log(b + 3);
-            console.log(4);
-            console.log(1 + b + 3);
-        }
-    }
-}
-
-iife: {
-    options = {
-        evaluate: true,
-        reduce_vars: true,
-    }
-    input: {
-        !function(a, b, c) {
-            b++;
-            console.log(a - 1, b * 1, c + 2);
-        }(1, 2, 3);
-    }
-    expect: {
-        !function(a, b, c) {
-            b++;
-            console.log(0, 1 * b, 5);
-        }(1, 2, 3);
-    }
-}
-
-iife_new: {
-    options = {
-        evaluate: true,
-        reduce_vars: true,
-    }
-    input: {
-        var A = new function(a, b, c) {
-            b++;
-            console.log(a - 1, b * 1, c + 2);
-        }(1, 2, 3);
-    }
-    expect: {
-        var A = new function(a, b, c) {
-            b++;
-            console.log(0, 1 * b, 5);
-        }(1, 2, 3);
-    }
-}
-
-multi_def: {
-    options = {
-        evaluate: true,
-        reduce_vars: true,
-    }
-    input: {
-        function f(a) {
-            if (a)
-                var b = 1;
-            else
-                var b = 2
-            console.log(b + 1);
-        }
-    }
-    expect: {
-        function f(a) {
-            if (a)
-                var b = 1;
-            else
-                var b = 2
-            console.log(b + 1);
-        }
-    }
-}
-
-multi_def_2: {
-    options = {
-        evaluate: true,
-        reduce_vars: true,
-    }
-    input: {
-        if (code == 16)
-            var bitsLength = 2, bitsOffset = 3, what = len;
-        else if (code == 17)
-            var bitsLength = 3, bitsOffset = 3, what = (len = 0);
-        else if (code == 18)
-            var bitsLength = 7, bitsOffset = 11, what = (len = 0);
-        var repeatLength = this.getBits(bitsLength) + bitsOffset;
-    }
-    expect: {
-        if (16 == code)
-            var bitsLength = 2, bitsOffset = 3, what = len;
-        else if (17 == code)
-            var bitsLength = 3, bitsOffset = 3, what = (len = 0);
-        else if (18 == code)
-            var bitsLength = 7, bitsOffset = 11, what = (len = 0);
-        var repeatLength = this.getBits(bitsLength) + bitsOffset;
-    }
-}
+}

test/compress/screw-ie8.js

@@ -46,8 +46,6 @@ do_screw_try_catch: {
 }
 
 dont_screw_try_catch: {
-    // This test is known to generate incorrect code for screw_ie8=false.
-    // Update expected result in the event this bug is ever fixed.
     options = { screw_ie8: false };
     mangle = { screw_ie8: false };
     beautify = { screw_ie8: false };
@@ -104,8 +102,6 @@ do_screw_try_catch_undefined: {
 }
 
 dont_screw_try_catch_undefined: {
-    // This test is known to generate incorrect code for screw_ie8=false.
-    // Update expected result in the event this bug is ever fixed.
     options = { screw_ie8: false };
     mangle = { screw_ie8: false };
     beautify = { screw_ie8: false };
@@ -127,8 +123,8 @@ dont_screw_try_catch_undefined: {
             } catch (n) {
                 console.log("caught: "+n)
             }
-            console.log("undefined is " + n);
-            return o === n
+            console.log("undefined is " + void 0);
+            return void 0===o
         }
     }
 }

test/compress/sequences.js

@@ -169,85 +169,3 @@ 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() {}()
-    }
-}

test/compress/super.js

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

test/compress/template-string.js

@@ -0,0 +1,379 @@
+template_strings: {
+    beautify = {
+        quote_style: 3
+    }
+    input: {
+        ``;
+        `xx\`x`;
+        `${ foo + 2 }`;
+        ` foo ${ bar + `baz ${ qux }` }`;
+    }
+    expect_exact: "``;`xx\\`x`;`${foo+2}`;` foo ${bar+`baz ${qux}`}`;";
+}
+
+template_string_prefixes: {
+    beautify = {
+        quote_style: 3
+    }
+    input: {
+        String.raw`foo`;
+        foo `bar`;
+    }
+    expect_exact: "String.raw`foo`;foo`bar`;";
+}
+
+template_strings_ascii_only: {
+    beautify = {
+        ascii_only: true,
+        quote_style: 3
+    }
+    input: {
+        var foo = `foo
+        bar
+        ↂωↂ`;
+        var bar = `\``;
+    }
+    expect_exact: "var foo=`foo\\n        bar\\n        \\u2182\\u03c9\\u2182`;var bar=`\\``;"
+}
+
+template_strings_without_ascii_only: {
+    beautify = {
+        quote_style: 3
+    }
+    input: {
+        var foo = `foo
+        bar
+        ↂωↂ`
+    }
+    expect_exact: "var foo=`foo\n        bar\n        ↂωↂ`;"
+}
+
+template_string_with_constant_expression: {
+    options = {
+        evaluate: true
+    }
+    beautify = {
+        quote_style: 3
+    }
+    input: {
+        var foo = `${4 + 4} equals 4 + 4`;
+    }
+    expect: {
+        var foo = `8 equals 4 + 4`;
+    }
+}
+
+template_string_with_predefined_constants: {
+    options = {
+        evaluate: true
+    }
+    beautify = {
+        quote_style: 3
+    }
+    input: {
+        var foo = `This is ${undefined}`;
+        var bar = `This is ${NaN}`;
+        var baz = `This is ${null}`;
+        var foofoo = `This is ${Infinity}`;
+        var foobar = "This is ${1/0}";
+        var foobaz = 'This is ${1/0}';
+        var barfoo = "This is ${NaN}";
+        var bazfoo = "This is ${null}";
+        var bazbaz = `This is ${1/0}`;
+        var barbar = `This is ${0/0}`;
+        var barbar = "This is ${0/0}";
+        var barber = 'This is ${0/0}';
+
+        var a = `${4**11}`; // 8 in template vs 7 chars - 4194304
+        var b = `${4**12}`; // 8 in template vs 8 chars - 16777216
+        var c = `${4**14}`; // 8 in template vs 9 chars - 268435456
+    }
+    expect: {
+        var foo = `This is undefined`;
+        var bar = `This is NaN`;
+        var baz = `This is null`;
+        var foofoo = `This is ${1/0}`;
+        var foobar = "This is ${1/0}";
+        var foobaz = 'This is ${1/0}';
+        var barfoo = "This is ${NaN}";
+        var bazfoo = "This is ${null}";
+        var bazbaz = `This is ${1/0}`;
+        var barbar = `This is NaN`;
+        var barbar = "This is ${0/0}";
+        var barber = 'This is ${0/0}';
+
+        var a = `4194304`;
+        var b = `16777216`; // Potential for further concatentation
+        var c = `${4**14}`; // Not worth converting
+    }
+}
+
+template_string_evaluate_with_many_segments: {
+    options = {
+        evaluate: true
+    }
+    beautify = {
+        quote_style: 3
+    }
+    input: {
+        var foo = `Hello ${guest()}, welcome to ${location()}${"."}`;
+        var bar = `${1}${2}${3}${4}${5}${6}${7}${8}${9}${0}`;
+        var baz = `${foobar()}${foobar()}${foobar()}${foobar()}`;
+        var buzz = `${1}${foobar()}${2}${foobar()}${3}${foobar()}`;
+    }
+    expect: {
+        var foo = `Hello ${guest()}, welcome to ${location()}.`;
+        var bar = `1234567890`;
+        var baz = `${foobar()}${foobar()}${foobar()}${foobar()}`;
+        var buzz = `1${foobar()}2${foobar()}3${foobar()}`;
+    }
+}
+
+template_string_with_many_segments: {
+    beautify = {
+        quote_style: 3
+    }
+    input: {
+        var foo = `Hello ${guest()}, welcome to ${location()}${"."}`;
+        var bar = `${1}${2}${3}${4}${5}${6}${7}${8}${9}${0}`;
+        var baz = `${foobar()}${foobar()}${foobar()}${foobar()}`;
+        var buzz = `${1}${foobar()}${2}${foobar()}${3}${foobar()}`;
+    }
+    expect: {
+        var foo = `Hello ${guest()}, welcome to ${location()}${"."}`;
+        var bar = `${1}${2}${3}${4}${5}${6}${7}${8}${9}${0}`;
+        var baz = `${foobar()}${foobar()}${foobar()}${foobar()}`;
+        var buzz = `${1}${foobar()}${2}${foobar()}${3}${foobar()}`;
+    }
+}
+
+template_string_to_normal_string: {
+    options = {
+        evaluate: true
+    }
+    beautify = {
+        quote_style: 0
+    }
+    input: {
+        var foo = `This is ${undefined}`;
+        var bar = "Decimals " + `${1}${2}${3}${4}${5}${6}${7}${8}${9}${0}`;
+    }
+    expect: {
+        var foo = `This is undefined`;
+        var bar = "Decimals 1234567890";
+    }
+}
+
+template_concattenating_string: {
+    options = {
+        evaluate: true
+    }
+    beautify = {
+        quote_style: 3 // Yes, keep quotes
+    }
+    input: {
+        var foo = "Have a nice " + `day. ${`day. ` + `day.`}`;
+        var bar = "Have a nice " + `${day()}`;
+    }
+    expect: {
+        var foo = "Have a nice day. day. day.";
+        var bar = "Have a nice " + `${day()}`;
+    }
+}
+
+evaluate_nested_templates: {
+    options = {
+        evaluate: true
+    }
+    beautify = {
+        quote_style: 0
+    }
+    input: {
+        var baz = `${`${`${`foo`}`}`}`;
+    }
+    expect: {
+        var baz = `foo`;
+    }
+}
+
+enforce_double_quotes: {
+    beautify = {
+        quote_style: 1
+    }
+    input: {
+        var foo = `Hello world`;
+        var bar = `Hello ${'world'}`;
+        var baz = `Hello ${world()}`;
+    }
+    expect: {
+        var foo = `Hello world`;
+        var bar = `Hello ${"world"}`;
+        var baz = `Hello ${world()}`;
+    }
+}
+
+enforce_single_quotes: {
+    beautify = {
+        quote_style: 2
+    }
+    input: {
+        var foo = `Hello world`;
+        var bar = `Hello ${"world"}`;
+        var baz = `Hello ${world()}`;
+    }
+    expect: {
+        var foo = `Hello world`;
+        var bar = `Hello ${'world'}`;
+        var baz = `Hello ${world()}`;
+    }
+}
+
+enforce_double_quotes_and_evaluate: {
+    beautify = {
+        quote_style: 1
+    }
+    options = {
+        evaluate: true
+    }
+    input: {
+        var foo = `Hello world`;
+        var bar = `Hello ${'world'}`;
+        var baz = `Hello ${world()}`;
+    }
+    expect: {
+        var foo = `Hello world`;
+        var bar = `Hello world`;
+        var baz = `Hello ${world()}`;
+    }
+}
+
+enforce_single_quotes_and_evaluate: {
+    beautify = {
+        quote_style: 2
+    }
+    options = {
+        evaluate: true
+    }
+    input: {
+        var foo = `Hello world`;
+        var bar = `Hello ${"world"}`;
+        var baz = `Hello ${world()}`;
+    }
+    expect: {
+        var foo = `Hello world`;
+        var bar = `Hello world`;
+        var baz = `Hello ${world()}`;
+    }
+}
+
+respect_inline_script: {
+    beautify = {
+        inline_script: true,
+        quote_style: 3
+    }
+    input: {
+        var foo = `</script>${content}`;
+        var bar = `<!--`;
+        var baz = `-->`;
+    }
+    expect_exact: "var foo=`<\\/script>${content}`;var bar=`\\x3c!--`;var baz=`--\\x3e`;";
+}
+
+do_not_optimize_tagged_template_1: {
+    beautify = {
+        quote_style: 0
+    }
+    options = {
+        evaluate: true
+    }
+    input: {
+        var foo = tag`Shall not be optimized. ${"But " + "this " + "is " + "fine."}`;
+        var bar = tag`Don't even mind changing my quotes!`;
+    }
+    expect_exact:
+        'var foo=tag`Shall not be optimized. ${"But this is fine."}`;var bar=tag`Don\'t even mind changing my quotes!`;';
+}
+
+do_not_optimize_tagged_template_2: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        var foo = tag`test` + " something out";
+    }
+    expect_exact: 'var foo=tag`test`+" something out";';
+}
+
+keep_raw_content_in_tagged_template: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        var foo = tag`\u0020\u{20}\u{00020}\x20\40\040 `;
+    }
+    expect_exact: "var foo=tag`\\u0020\\u{20}\\u{00020}\\x20\\40\\040 `;";
+}
+
+allow_chained_templates: {
+    input: {
+        var foo = tag`a``b``c``d`;
+    }
+    expect: {
+        var foo = tag`a``b``c``d`;
+    }
+}
+
+check_escaped_chars: {
+    input: {
+        var foo = `\u0020\u{20}\u{00020}\x20\40\040 `;
+    }
+    expect_exact: "var foo=`       `;";
+}
+
+escape_dollar_curly: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        console.log(`\$\{ beep \}`)
+        console.log(`${1-0}\${2-0}$\{3-0}${4-0}`)
+        console.log(`$${""}{not an expression}`)
+    }
+    expect_exact: "console.log(`\\${ beep }`);console.log(`1\\${2-0}\\${3-0}4`);console.log(`\\${not an expression}`);"
+}
+
+template_starting_with_newline: {
+    options = {
+        dead_code: true
+    }
+    input: {
+        function foo(e) {
+            return `
+this is a template string!`;
+        };
+    } expect_exact: "function foo(e){return`\nthis is a template string!`}"
+}
+
+template_with_newline: {
+    options = {
+        dead_code: true
+    }
+    input: {
+        function foo(e) {
+            return `yep,
+this is a template string!`;
+        };
+    } expect_exact: "function foo(e){return`yep,\nthis is a template string!`}"
+}
+
+template_ending_with_newline: {
+    options = {
+        dead_code: true
+    }
+    input: {
+        function foo(e) {
+            return `this is a template string!
+`;
+        };
+    } expect_exact: "function foo(e){return`this is a template string!\n`}"
+}

test/compress/try-catch.js

@@ -0,0 +1,9 @@
+catch_destructuring_with_sequence: {
+    input: {
+        try {
+            throw {};
+        } catch ({xCover = (0, function() {})} ) {
+        }
+    }
+    expect_exact: "try{throw{}}catch({xCover=(0,function(){})}){}"
+}

test/compress/typeof.js

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

test/compress/unicode.js

@@ -15,3 +15,106 @@ unicode_parse_variables: {
         var l০ = 3;
     }
 }
+
+unicode_escaped_identifier: {
+    beautify = {ecma: 6}
+    input: {
+        var \u{61} = "foo";
+        var \u{10000} = "bar";
+    }
+    expect_exact: 'var a="foo";var \u{10000}="bar";';
+}
+
+unicode_identifier_ascii_only: {
+    beautify = {ascii_only: true, ecma: 6}
+    input: {
+        var \u{0061} = "hi";
+        var bar = "h\u{0065}llo";
+        var \u{10000} = "testing \u{101111}";
+    }
+    expect_exact: 'var a="hi";var bar="hello";var \\u{10000}="testing \\u{101111}";'
+}
+
+unicode_string_literals: {
+    beautify = {ascii_only: true, ecma: 6}
+    input: {
+        var a = "6 length unicode character: \u{101111}";
+    }
+    expect_exact: 'var a="6 length unicode character: \\u{101111}";'
+}
+
+// Don't escape identifiers below es6 (or in this case double escaped in expect_exact)
+unicode_output_es5_surrogates: {
+    beautify = {ascii_only: true, ecma: 5}
+    input: {
+        var \u{10000} = "6 length unicode character: \u{10FFFF}";
+    }
+    expect_exact: 'var \u{10000}="6 length unicode character: \\udbff\\udfff";'
+}
+
+check_escape_style: {
+    beautify = {ascii_only: true, ecma: 6}
+    input: {
+        var a = "\x01";
+        var \ua0081 = "\x10"; // \u0081 only in ID_Continue
+        var \u0100 = "\u0100";
+        var \u1000 = "\u1000";
+        var \u{10000} = "\u{10000}";
+        var \u{2f800} = "\u{100000}";
+    }
+    expect_exact: 'var a="\\x01";var \\ua0081="\\x10";var \\u0100="\\u0100";var \\u1000="\\u1000";var \\u{10000}="\\u{10000}";var \\u{2f800}="\\u{100000}";'
+}
+
+// Don't escape identifiers below es6, no escaped identifiers support and no \u{} syntax
+check_escape_style_es5: {
+    beautify = {ascii_only: true, ecma: 5}
+    input: {
+        var a = "\x01";
+        var \ua0081 = "\x10"; // \u0081 only in ID_Continue
+        var \u0100 = "\u0100";
+        var \u1000 = "\u1000";
+        var \u{10000} = "\u{10000}"; // Identifier won't be escaped in es 5.1
+        var \u{2f800} = "\u{100000}"; // Same
+    }
+    expect_exact: 'var a="\\x01";var \\ua0081="\\x10";var \\u0100="\\u0100";var \\u1000="\\u1000";var \ud800\udc00="\\ud800\\udc00";var \ud87e\udc00="\\udbc0\\udc00";'
+}
+
+ID_continue_with_surrogate_pair: {
+    beautify = {ascii_only: true, ecma: 6}
+    input: {
+        var \u{2f800}\u{2f800}\u{2f800}\u{2f800} = "\u{100000}\u{100000}\u{100000}\u{100000}\u{100000}";
+    }
+    expect_exact: 'var \\u{2f800}\\u{2f800}\\u{2f800}\\u{2f800}="\\u{100000}\\u{100000}\\u{100000}\\u{100000}\\u{100000}";'
+}
+
+escape_non_escaped_identifier: {
+    beautify = {ascii_only: true, ecma: 6}
+    input: {
+        var µþ = "µþ";
+    }
+    expect_exact: 'var \\u00b5\\u00fe="\\xb5\\xfe";'
+}
+
+non_escape_2_non_escape: {
+    beautify = {ascii_only: false, ecma: 6}
+    input: {
+        var µþ = "µþ";
+    }
+    expect_exact: 'var µþ="µþ";'
+}
+
+non_escape_2_half_escape1: {
+    beautify = {ascii_only: false, ascii_identifiers: true, ecma: 6}
+    input: {
+        var µþ = "µþ";
+    }
+    expect_exact: 'var \\u00b5\\u00fe="µþ";'
+}
+
+non_escape_2_half_escape2: {
+    beautify = {ascii_only: true, ascii_identifiers: false, ecma: 6}
+    input: {
+        var µþ = "µþ";
+    }
+    expect_exact: 'var µþ="\\xb5\\xfe";'
+}

test/compress/yield.js

@@ -0,0 +1,166 @@
+generators: {
+    input: {
+        function* fn() {};
+    }
+    expect_exact: "function*fn(){}"
+}
+
+generators_yield: {
+    input: {
+      function* fn() {
+        yield remote();
+      }
+    }
+    expect_exact: "function*fn(){yield remote()}"
+}
+
+generators_yield_assign: {
+    input: {
+      function* fn() {
+          var x = {};
+          x.prop = yield 5;
+      }
+    }
+    expect_exact: "function*fn(){var x={};x.prop=yield 5}"
+}
+
+generator_yield_undefined: {
+    input: {
+        function* fn() {
+            yield;
+        }
+    }
+    expect_exact: "function*fn(){yield}"
+}
+
+yield_optimize_expression: {
+    options = {
+    }
+    input: {
+        function* f1() { yield; }
+        function* f2() { yield undefined; }
+        function* f3() { yield null; }
+        function* f4() { yield* undefined; }
+    }
+    expect: {
+        function* f1() { yield }
+        function* f2() { yield; }
+        function* f3() { yield null; }
+        function* f4() { yield* void 0; }
+    }
+}
+
+yield_statements: {
+    input: {
+        function* fn() {
+            var a = (yield 1) + (yield 2);
+            var b = (yield 3) === (yield 4);
+            var c = (yield 5) << (yield 6);
+            var d = yield 7;
+            var e = (yield 8) ? yield 9 : yield 10;
+            var f = -(yield 11);
+        }
+    }
+    expect_exact: "function*fn(){var a=(yield 1)+(yield 2);var b=(yield 3)===(yield 4);var c=(yield 5)<<(yield 6);var d=yield 7;var e=(yield 8)?yield 9:yield 10;var f=-(yield 11)}"
+}
+
+yield_as_identifier_in_function_in_generator: {
+    input: {
+        var g = function*() {
+            function h() {
+                yield = 1;
+            }
+        };
+    }
+    expect: {
+        var g = function*() {
+            function h() {
+                yield = 1;
+            }
+        };
+    }
+}
+
+yield_before_punctuators: {
+    input: {
+        iter = (function*() {
+            assignmentResult = [ x = yield ] = value;
+        })();
+        function* g1() { (yield) }
+        function* g2() { [yield] }
+        function* g3() { return {yield} } // Added return to avoid {} drop
+        function* g4() { yield, yield; }
+        function* g5() { (yield) ? yield : yield; }
+    }
+    expect: {
+        iter = (function*() {
+            assignmentResult = [ x = yield ] = value;
+        })();
+        function* g1() { (yield) }
+        function* g2() { [yield] }
+        function* g3() { return {yield} }
+        function* g4() { yield, yield; }
+        function* g5() { (yield) ? yield : yield; }
+    }
+}
+
+yield_as_identifier_outside_strict_mode: {
+    input: {
+        import yield from "bar";
+        yield = 123;
+        while (true) {
+            yield:
+            for(;;) break yield;
+
+            foo();
+        }
+        while (true)
+            yield: for(;;) continue yield;
+        function yield(){}
+        function foo(...yield){}
+        try { new Error("") } catch (yield) {}
+        var yield = "foo";
+    }
+    expect: {
+        import yield from "bar";
+        yield = 123;
+        while (true) {
+            yield:
+            for(;;) break yield;
+
+            foo();
+        }
+        while (true)
+            yield: for(;;) continue yield;
+        function yield(){}
+        function foo(...yield){}
+        try { new Error("") } catch (yield) {}
+        var yield = "foo";
+    }
+}
+
+empty_generator_as_parameter_with_side_effects: {
+    options = {
+        side_effects: true
+    }
+    input: {
+        var GeneratorPrototype = Object.getPrototypeOf(
+          Object.getPrototypeOf(function*() {}())
+        );
+        evaluate(GeneratorPrototype);
+    }
+    expect_exact: "var GeneratorPrototype=Object.getPrototypeOf(Object.getPrototypeOf(function*(){}()));evaluate(GeneratorPrototype);"
+}
+
+empty_generator_as_parameter_without_side_effects: {
+    options = {
+        side_effects: false
+    }
+    input: {
+        var GeneratorPrototype = Object.getPrototypeOf(
+          Object.getPrototypeOf(function*() {}())
+        );
+        evaluate(GeneratorPrototype);
+    }
+    expect_exact: "var GeneratorPrototype=Object.getPrototypeOf(Object.getPrototypeOf(function*(){}()));evaluate(GeneratorPrototype);"
+}

test/input/global_defs/nested.js

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

test/input/global_defs/simple.js

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

test/input/invalid/eof.js

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

test/input/invalid/simple.js

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

test/input/invalid/tab.js

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

test/input/issue-1431/sample.js

@@ -1,14 +0,0 @@
-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

@@ -1,73 +0,0 @@
-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

@@ -1,17 +0,0 @@
-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

@@ -1,12 +0,0 @@
-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

@@ -1,3 +0,0 @@
-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

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

test/jetstream.js

@@ -1,87 +0,0 @@
-#! /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

@@ -1,32 +0,0 @@
-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_SymbolRef);
-                assert.equal(node.key.start.pos, 16);
-                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/arrow.js

@@ -0,0 +1,83 @@
+var assert = require("assert");
+var uglify = require("../../");
+
+describe("Arrow functions", function() {
+    it("Should not accept spread tokens on non-last parameters or without arguments parentheses", function() {
+        var tests = [
+            "var a = ...a => {return a.join()}",
+            "var b = (a, ...b, c) => { return a + b.join() + c}",
+            "var c = (...a, b) => a.join()"
+        ];
+        var test = function(code) {
+            return function() {
+                uglify.parse(code, {fromString: true});
+            }
+        }
+        var error = function(e) {
+            return e instanceof uglify.JS_Parse_Error &&
+                e.message === "SyntaxError: Unexpected token: expand (...)";
+        }
+
+        for (var i = 0; i < tests.length; i++) {
+            assert.throws(test(tests[i]), error);
+        }
+    });
+    it("Should not accept holes in object binding patterns, while still allowing a trailing elision", function() {
+        var tests = [
+            "f = ({, , ...x} = [1, 2]) => {};"
+        ];
+        var test = function(code) {
+            return function() {
+                uglify.parse(code, {fromString: true});
+            }
+        }
+        var error = function(e) {
+            return e instanceof uglify.JS_Parse_Error &&
+                e.message === "SyntaxError: Unexpected token: punc (,)";
+        }
+
+        for (var i = 0; i < tests.length; i++) {
+            assert.throws(test(tests[i]), error);
+        }
+    });
+    it("Should not accept newlines before arrow token", function() {
+        var tests = [
+            "f = foo\n=> 'foo';",
+            "f = (foo, bar)\n=> 'foo';",
+            "f = ()\n=> 'foo';",
+            "foo((bar)\n=>'baz';);"
+        ];
+        var test = function(code) {
+            return function() {
+                uglify.parse(code, {fromString: true});
+            }
+        }
+        var error = function(e) {
+            return e instanceof uglify.JS_Parse_Error &&
+                e.message === "SyntaxError: Unexpected newline before arrow (=>)";
+        }
+
+        for (var i = 0; i < tests.length; i++) {
+            assert.throws(test(tests[i]), error);
+        }
+    });
+    it("Should not accept arrow functions in the middle or end of an expression", function() {
+        var tests = [
+            "typeof x => 0",
+            "0 + x => 0"
+        ];
+        var test = function(code) {
+            return function() {
+                uglify.parse(code, {fromString: true});
+            }
+        }
+        var error = function(e) {
+            return e instanceof uglify.JS_Parse_Error &&
+                e.message === "SyntaxError: Unexpected token: arrow (=>)";
+        }
+
+        for (var i = 0; i < tests.length; i++) {
+            assert.throws(test(tests[i]), error);
+        }
+    });
+});

test/mocha/builtins.js

@@ -0,0 +1,34 @@
+var UglifyJS = require("../../");
+var assert = require("assert");
+
+describe("builtins", function() {
+    it ("Should not mangle builtins", function() {
+        var test = "function foo(something){\n" +
+            "    return [Object,Array,Function,Number,String,Boolean,Error,Math,Date,RegExp,Symbol,Map,Promise,Proxy,Reflect,Set,WeakMap,WeakSet,Float32Array,something];\n" +
+            "};";
+
+        var result = UglifyJS.minify(test, {fromString: true, parse: {bare_returns: true}}).code;
+
+        assert.strictEqual(result.indexOf("something"), -1);
+
+        assert.notEqual(result.indexOf("Object"), -1);
+        assert.notEqual(result.indexOf("Array"), -1);
+        assert.notEqual(result.indexOf("Function"), -1);
+        assert.notEqual(result.indexOf("Number"), -1);
+        assert.notEqual(result.indexOf("String"), -1);
+        assert.notEqual(result.indexOf("Boolean"), -1);
+        assert.notEqual(result.indexOf("Error"), -1);
+        assert.notEqual(result.indexOf("Math"), -1);
+        assert.notEqual(result.indexOf("Date"), -1);
+        assert.notEqual(result.indexOf("RegExp"), -1);
+        assert.notEqual(result.indexOf("Symbol"), -1);
+        assert.notEqual(result.indexOf("Promise"), -1);
+        assert.notEqual(result.indexOf("Proxy"), -1);
+        assert.notEqual(result.indexOf("Reflect"), -1);
+        assert.notEqual(result.indexOf("Set"), -1);
+        assert.notEqual(result.indexOf("WeakMap"), -1);
+        assert.notEqual(result.indexOf("WeakSet"), -1);
+        assert.notEqual(result.indexOf("Map"), -1);
+        assert.notEqual(result.indexOf("Float32Array"), -1);
+    });
+});

test/mocha/class.js

@@ -0,0 +1,57 @@
+var assert = require("assert");
+var uglify = require("../../");
+
+describe("Class", function() {
+    it("Should not accept spread on non-last parameters in methods", function() {
+        var tests = [
+            "class foo { bar(...a, b) { return a.join(b) } }",
+            "class foo { bar(a, b, ...c, d) { return c.join(a + b) + d } }",
+            "class foo { *bar(...a, b) { return a.join(b) } }",
+            "class foo { *bar(a, b, ...c, d) { return c.join(a + b) + d } }"
+        ];
+        var test = function(code) {
+            return function() {
+                uglify.parse(code, {fromString: true});
+            }
+        }
+        var error = function(e) {
+            return e instanceof uglify.JS_Parse_Error &&
+                e.message.substr(0, 31) === "SyntaxError: Unexpected token: ";
+        }
+
+        for (var i = 0; i < tests.length; i++) {
+            assert.throws(test(tests[i]), error);
+        }
+    });
+
+    it("Should return the correct token for class methods", function() {
+        var tests = [
+            {
+                code: "class foo{static test(){}}",
+                token_value_start: "static",
+                token_value_end: "}"
+            },
+            {
+                code: "class bar{*procedural(){}}",
+                token_value_start: "*",
+                token_value_end: "}"
+            },
+            {
+                code: "class foobar{aMethod(){}}",
+                token_value_start: "aMethod",
+                token_value_end: "}"
+            },
+            {
+                code: "class foobaz{get something(){}}",
+                token_value_start: "get",
+                token_value_end: "}"
+            }
+        ];
+
+        for (var i = 0; i < tests.length; i++) {
+            var ast = uglify.parse(tests[i].code);
+            assert.strictEqual(ast.body[0].properties[0].start.value, tests[i].token_value_start);
+            assert.strictEqual(ast.body[0].properties[0].end.value, tests[i].token_value_end);
+        }
+    });
+});

test/mocha/cli.js

@@ -1,6 +1,5 @@
 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';
@@ -57,7 +56,7 @@ describe("bin/uglifyjs", function () {
            if (err) throw err;
 
            assert.strictEqual(stdout, "var bar=function(){function foo(bar){return bar}return foo}();\n" +
-               "//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInRlc3QvaW5wdXQvaXNzdWUtMTMyMy9zYW1wbGUuanMiXSwibmFtZXMiOlsiYmFyIiwiZm9vIl0sIm1hcHBpbmdzIjoiQUFBQSxHQUFJQSxLQUFNLFdBQ04sUUFBU0MsS0FBS0QsS0FDVixNQUFPQSxLQUdYLE1BQU9DIn0=\n");
+               "//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInRlc3QvaW5wdXQvaXNzdWUtMTMyMy9zYW1wbGUuanMiXSwibmFtZXMiOlsiYmFyIiwiZm9vIl0sIm1hcHBpbmdzIjoiQUFBQSxHQUFJQSxLQUFPLFdBQ1AsUUFBU0MsS0FBS0QsS0FDVixNQUFPQSxLQUdYLE1BQU9DIn0=\n");
            done();
        });
     });
@@ -71,171 +70,4 @@ 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';
-
-       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();
-        });
-    });
 });

test/mocha/comment.js

@@ -13,7 +13,7 @@ describe("Comment", function() {
 
         var fail = function(e) {
             return e instanceof uglify.JS_Parse_Error &&
-                e.message === "Unexpected token: operator (>)" &&
+                e.message === "SyntaxError: Unexpected token: operator (>)" &&
                 e.line === 2 &&
                 e.col === 0;
         }
@@ -31,19 +31,20 @@ describe("Comment", function() {
             "/*Some comment 2\r\n\r\n\r\n*/\r\n>\n\n\n\n\n\n",
             "/*Some comment 3\r\r\r*/\r>\n\n\n\n\n\n",
             "/*Some comment 4\u2028\u2028\u2028*/\u2028>\n\n\n\n\n\n",
-            "/*Some comment 5\u2029\u2029\u2029*/\u2029>\n\n\n\n\n\n"
+            "/*Some comment 5\u2029\u2029\u2029*/\u2029>\n\n\n\n\n\n",
+            "/*Some comment 6\udbff\udfff\udbff\udfff\n\n\n*/\n>\n\n\n\n\n"
         ];
 
         var fail = function(e) {
             return e instanceof uglify.JS_Parse_Error &&
-                e.message === "Unexpected token: operator (>)" &&
+                e.message === "SyntaxError: Unexpected token: operator (>)" &&
                 e.line === 5 &&
                 e.col === 0;
         }
 
         for (var i = 0; i < tests.length; i++) {
             assert.throws(function() {
-                uglify.parse(tests[i], {fromString: true})
+                uglify.parse(tests[i], {fromString: true});
             }, fail, tests[i]);
         }
     });

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, reduce_vars: false },
+            compress: { collapse_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, reduce_vars: false },
+            compress: { collapse_vars: false },
             mangle: {},
-            output: { comments: false },
+            output: {},
         });
         assert.strictEqual(result.code, 'function f(){var n=!1;return n}');
     });

test/mocha/directives.js

@@ -62,10 +62,10 @@ describe("Directives", function() {
     it("Should know which strings are directive and which ones are not", function() {
         var test_directive = function(tokenizer, test) {
             test.directives.map(function(directive) {
-                assert.strictEqual(tokenizer.has_directive(directive), true, directive + " in " + test.input);
+                assert.strictEqual(tokenizer.has_directive(directive), true, "Didn't found directive `" + directive + "` at the end of `" + test.input + '`');
             });
             test.non_directives.map(function(fake_directive) {
-                assert.strictEqual(tokenizer.has_directive(fake_directive), false, fake_directive + " in " + test.input);
+                assert.strictEqual(tokenizer.has_directive(fake_directive), false, "Unexpectedly found directive `" + fake_directive + "` at the end of `" + test.input + '`');
             });
         }
 
@@ -156,6 +156,16 @@ describe("Directives", function() {
                 input: '"use strict";try{"use asm";',
                 directives: ["use strict"],
                 non_directives: ["use\nstrict", "use \nstrict", "use asm"]
+            },
+            {
+                input: 'class foo {',
+                directives: ["use strict"],
+                non_directives: ["use\nstrict", "use asm"]
+            },
+            {
+                input: 'class foo {}',
+                directives: [],
+                non_directives: ["use strict", "use asm", "use\nstrict"]
             }
         ];
 
@@ -168,7 +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, "Unexpected token: punc (])");
+                assert.strictEqual(e.message, "SyntaxError: Unexpected token: punc (])");
             }
 
             test_directive(tokenizer, tests[i]);
@@ -367,4 +377,44 @@ describe("Directives", function() {
             );
         }
     });
+    it("Should be detect implicit usages of strict mode from tree walker", function() {
+        var tests = [
+            {
+                input: 'class foo {bar(){_check_}}',
+                directives: ["use strict"],
+                non_directives: ["use bar"]
+            },
+            {
+                input: 'class foo {bar(){}}_check_',
+                directives: [],
+                non_directives: ["use strict", "use bar"]
+            }
+        ];
+
+        var i = 0;
+        var checked;
+        var checkWalker = new uglify.TreeWalker(function(node, descend) {
+            if (node instanceof uglify.AST_Symbol && node.name === "_check_") {
+                checked = true;
+                for (var j = 0; j < tests[i].directives.length; j++) {
+                    assert.equal(checkWalker.has_directive(tests[i].directives[j]), true,
+                        "Did not found directive '" + tests[i].directives[j] +  "' in test " + tests[i].input)
+                }
+                for (var k = 0; k < tests[i].non_directives.length; k++) {
+                    assert.equal(checkWalker.has_directive(tests[i].non_directives[k]), undefined,
+                        "Found directive '" + tests[i].non_directives[k] +  "' in test " + tests[i].input)
+                }
+            }
+        });
+
+        for (; i < tests.length; i++) {
+            // Do tests - iterate the ast in each test - check only when _check_ occurs - fail when no _check_ has been found
+            checked = false;
+            var ast = uglify.parse(tests[i].input);
+            ast.walk(checkWalker);
+            if (!checked) {
+                throw "No _check_ symbol found in " + tests[i].input;
+            }
+        }
+    });
 });

test/mocha/eof.js

@@ -0,0 +1,36 @@
+var assert = require("assert");
+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);
+        }
+        var parse = function(test) {
+            return function() {
+                uglify.parse(test);
+            }
+        }
+        // Chops off 1 char at a time until limit or start of string is reached
+        // The passed code must still be valid when unchopped
+        var test_eol = function(input, chopLimit) {
+            if (chopLimit === undefined) {
+                chopLimit = input.length - 1;
+            }
+
+            assert.doesNotThrow(parse(input), "Expected valid code for \n" + input);
+
+            for (var i = input.length - 1; chopLimit > 0; chopLimit--, i--) {
+                var code = input.substr(0, i);
+                assert.throws(parse(code), error, code);
+            }
+        }
+
+        test_eol("var \\u1234", 7); // Incomplete identifier
+        test_eol("'Incomplete string'");
+        test_eol("/Unterminated regex/");
+        test_eol("` Unterminated template string`");
+        test_eol("/* Unfinishing multiline comment */");
+    });
+});

test/mocha/expression.js

@@ -0,0 +1,32 @@
+var assert = require("assert");
+var uglify = require("../../");
+
+describe("Expression", function() {
+    it("Should not allow the first exponentiation operator to be prefixed with an unary operator", function() {
+        var tests = [
+            "+5 ** 3",
+            "-5 ** 3",
+            "~5 ** 3",
+            "!5 ** 3",
+            "void 5 ** 3",
+            "typeof 5 ** 3",
+            "delete 5 ** 3",
+            "var a = -(5) ** 3;"
+        ];
+
+        var fail = function(e) {
+            return e instanceof uglify.JS_Parse_Error &&
+                /^SyntaxError: Unexpected token: operator \((?:[!+~-]|void|typeof|delete)\)/.test(e.message);
+        }
+
+        var exec = function(test) {
+            return function() {
+                uglify.parse(test);
+            }
+        }
+
+        for (var i = 0; i < tests.length; i++) {
+            assert.throws(exec(tests[i]), fail, tests[i]);
+        }
+    });
+});

test/mocha/function.js

@@ -0,0 +1,233 @@
+var assert = require("assert");
+var uglify = require("../../");
+
+describe("Function", function() {
+    it ("Should parse binding patterns correctly", function() {
+        // Function argument nodes are correct
+        function get_args(args) {
+            return args.map(function (arg) {
+                return [arg.TYPE, arg.name];
+            });
+        }
+
+        // Destructurings as arguments
+        var destr_fun1 = uglify.parse('(function ({a, b}) {})').body[0].body;
+        var destr_fun2 = uglify.parse('(function ([a, [b]]) {})').body[0].body;
+        var destr_fun3 = uglify.parse('({a, b}) => null').body[0].body;
+        var destr_fun4 = uglify.parse('([a, [b]]) => null').body[0].body;
+
+        assert.equal(destr_fun1.argnames.length, 1);
+        assert.equal(destr_fun2.argnames.length, 1);
+        assert.equal(destr_fun3.argnames.length, 1);
+        assert.equal(destr_fun4.argnames.length, 1);
+
+        var destruct1 = destr_fun1.argnames[0];
+        var destruct2 = destr_fun2.argnames[0];
+        var destruct3 = destr_fun3.argnames[0];
+        var destruct4 = destr_fun4.argnames[0];
+
+        assert(destruct1 instanceof uglify.AST_Destructuring);
+        assert(destruct2 instanceof uglify.AST_Destructuring);
+        assert(destruct3 instanceof uglify.AST_Destructuring);
+        assert(destruct4 instanceof uglify.AST_Destructuring);
+        assert(destruct2.names[1] instanceof uglify.AST_Destructuring);
+        assert(destruct4.names[1] instanceof uglify.AST_Destructuring);
+
+        assert.equal(destruct1.start.value, '{');
+        assert.equal(destruct1.end.value, '}');
+        assert.equal(destruct2.start.value, '[');
+        assert.equal(destruct2.end.value, ']');
+        assert.equal(destruct3.start.value, '{');
+        assert.equal(destruct3.end.value, '}');
+        assert.equal(destruct4.start.value, '[');
+        assert.equal(destruct4.end.value, ']');
+
+        assert.equal(destruct1.is_array, false);
+        assert.equal(destruct2.is_array, true);
+        assert.equal(destruct3.is_array, false);
+        assert.equal(destruct4.is_array, true);
+
+        var aAndB = [
+            ['SymbolFunarg', 'a'],
+            ['SymbolFunarg', 'b']
+        ];
+
+        assert.deepEqual(
+            [
+                destruct1.names[0].TYPE,
+                destruct1.names[0].name
+            ],
+            aAndB[0]);
+        assert.deepEqual(
+            [
+                destruct1.names[1].TYPE,
+                destruct1.names[1].name
+            ],
+            aAndB[1]);
+        assert.deepEqual(
+            [
+                destruct2.names[0].TYPE,
+                destruct2.names[0].name
+            ],
+            aAndB[0]);
+        assert.deepEqual(
+            [
+                destruct2.names[1].names[0].TYPE,
+                destruct2.names[1].names[0].name
+            ],
+            aAndB[1]);
+        assert.strictEqual(typeof destruct3.names[0].key, "string");
+        assert.strictEqual(destruct3.names[0].key, "a");
+        assert.strictEqual(typeof destruct3.names[1].key, "string");
+        assert.strictEqual(destruct3.names[1].key, "b");
+        assert.deepEqual(
+            [
+                destruct4.names[0].TYPE,
+                destruct4.names[0].name
+            ],
+            aAndB[0]);
+        assert.deepEqual(
+            [
+                destruct4.names[1].names[0].TYPE,
+                destruct4.names[1].names[0].name
+            ],
+            aAndB[1]);
+
+        assert.deepEqual(
+            get_args(destr_fun1.args_as_names()),
+            aAndB);
+        assert.deepEqual(
+            get_args(destr_fun2.args_as_names()),
+            aAndB);
+        assert.deepEqual(
+            get_args(destr_fun3.args_as_names()),
+            aAndB);
+        assert.deepEqual(
+            get_args(destr_fun4.args_as_names()),
+            aAndB);
+
+        // Making sure we don't accidentally accept things which
+        // Aren't argument destructurings
+
+        assert.throws(function () {
+            uglify.parse('(function ( { a, [ b ] } ) { })')
+        });
+
+        assert.throws(function () {
+            uglify.parse('(function (1) { })');
+        }, /Invalid function parameter/);
+
+        assert.throws(function () {
+            uglify.parse('(function (this) { })');
+        });
+
+        assert.throws(function () {
+            uglify.parse('(function ([1]) { })');
+        }, /Invalid function parameter/);
+
+        assert.throws(function () {
+            uglify.parse('(function [a] { })');
+        });
+
+        // generators
+        var generators_def = uglify.parse('function* fn() {}').body[0];
+        assert.equal(generators_def.is_generator, true);
+
+        assert.throws(function () {
+            uglify.parse('function* (){ }');
+        });
+
+        var generators_yield_def = uglify.parse('function* fn() {\nyield remote();\}').body[0].body[0];
+        assert.strictEqual(generators_yield_def.body.is_star, false);
+    });
+    it("Should not accept spread on non-last parameters", function() {
+        var tests = [
+            "var a = function(...a, b) { return a.join(b) }",
+            "var b = function(a, b, ...c, d) { return c.join(a + b) + d }",
+            "function foo(...a, b) { return a.join(b) }",
+            "function bar(a, b, ...c, d) { return c.join(a + b) + d }",
+            "var a = function*(...a, b) { return a.join(b) }",
+            "var b = function*(a, b, ...c, d) { return c.join(a + b) + d }",
+            "function* foo(...a, b) { return a.join(b) }",
+            "function* bar(a, b, ...c, d) { return c.join(a + b) + d }"
+        ];
+        var test = function(code) {
+            return function() {
+                uglify.parse(code, {fromString: true});
+            }
+        }
+        var error = function(e) {
+            return e instanceof uglify.JS_Parse_Error &&
+                e.message.substr(0, 31) === "SyntaxError: Unexpected token: ";
+        }
+
+        for (var i = 0; i < tests.length; i++) {
+            assert.throws(test(tests[i]), error);
+        }
+    });
+    it("Should not accept empty parameters after elision", function() {
+        var tests = [
+            "(function(,){})()",
+            "(function(a,){})()",
+        ];
+        var test = function(code) {
+            return function() {
+                uglify.parse(code, {fromString: true});
+            }
+        }
+        var error = function(e) {
+            return e instanceof uglify.JS_Parse_Error &&
+                e.message === "SyntaxError: Invalid function parameter";
+        }
+        for (var i = 0; i < tests.length; i++) {
+            assert.throws(test(tests[i]), error);
+        }
+    });
+    it("Should not accept an initializer when parameter is a rest parameter", function() {
+        var tests = [
+            "(function(...a = b){})()",
+            "(function(a, ...b = [c, d]))"
+        ];
+        var test = function(code) {
+            return function () {
+                uglify.parse(code, {fromString: true});
+            }
+        }
+        var error = function (e) {
+            return e instanceof uglify.JS_Parse_Error;
+        }
+        for (var i = 0; i < tests.length; i++) {
+            assert.throws(test(tests[i]), error, tests[i]);
+        }
+    });
+    it("Shoult not accept duplicated identifiers inside parameters in strict mode or when using default assigment or spread", function() {
+        // From: ES2016 9.2.12 FunctionDeclarationInstantiation (func, argumentsList)
+        // NOTE Early errors ensure that duplicate parameter names can only occur
+        // in non-strict functions that do not have parameter default values or
+        // rest parameters.
+        var tests = [
+            "(function(a = 1, a){})()",
+            "(function(a, [a = 3]){})()",
+            "(function(a, b, c, d, [{e: [...a]}]){})()",
+            "'use strict'; (function(a, a){})",
+            "(function({a, a = b}))",
+            "(function(a, [...a]){})",
+            "(function(a, ...a){})",
+            "(function(a, [a, ...b]){})",
+            "(function(a, {b: a, c: [...d]}){})",
+            "(function(a, a, {b: [...c]}){})"
+        ];
+        var test = function(code) {
+            return function () {
+                uglify.parse(code, {fromString: true});
+            }
+        }
+        var error = function (e) {
+            return e instanceof uglify.JS_Parse_Error &&
+                /^SyntaxError: 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

@@ -1,89 +0,0 @@
-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 &&
-                    e.message === "Invalid getter/setter name: " + data.operator;
-            };
-        };
-
-        var errorMessage = function(data) {
-            return "Expected but didn't get a syntax error while parsing following line:\n" + data.code;
-        };
-
-        var tests = generator();
-        for (var i = 0; i < tests.length; i++) {
-            var test = tests[i];
-            assert.throws(testCase(test), fail(test), errorMessage(test));
-        }
-    });
-
-});

test/mocha/lhs-expressions.js

@@ -0,0 +1,29 @@
+var assert = require("assert");
+var uglify = require("../../");
+
+describe("Left-hand side expressions", function () {
+    it("Should parse destructuring with const/let/var correctly", function () {
+        var decls = uglify.parse('var {a,b} = foo, { c, d } = bar');
+
+        assert.equal(decls.body[0].TYPE, 'Var');
+        assert.equal(decls.body[0].definitions.length, 2);
+        assert.equal(decls.body[0].definitions[0].name.TYPE, 'Destructuring');
+        assert.equal(decls.body[0].definitions[0].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');
+
+        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[2].TYPE, 'SymbolConst');
+
+        var expanding_def = uglify.parse('var [first, ...rest] = [1,2,3]').body[0].definitions[0];
+
+        assert.equal(expanding_def.name.names[0].TYPE, 'SymbolVar');
+        assert.equal(expanding_def.name.names[1].TYPE, 'Expansion');
+        assert.equal(expanding_def.name.names[1].expression.TYPE, 'SymbolVar');
+    });
+});

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 === "Unexpected line terminator";
+                e.message === "SyntaxError: Unexpected line terminator";
         }
         for (var i = 0; i < inputs.length; i++) {
             assert.throws(test(inputs[i]), fail);

test/mocha/minify.js

@@ -1,6 +1,5 @@
 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() {
@@ -76,51 +75,6 @@ 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() {
@@ -141,54 +95,4 @@ 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(){return 1})();", {
-                fromString: true,
-                output: {
-                    comments: "all",
-                    beautify: false,
-                }
-            });
-            var code = result.code;
-            assert.strictEqual(code, "var a=/*#__PURE__*/function(){return 1}();");
-        })
-    });
-
-    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

@@ -85,4 +85,11 @@ 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»";
+        });
+    });
 });

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 === "Legacy octal literals are not allowed in strict mode";
+                e.message === "SyntaxError: 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

@@ -0,0 +1,131 @@
+var Uglify = require("../../");
+var assert = require("assert");
+
+describe("Object", function() {
+    it("Should allow objects to have a methodDefinition as property", function() {
+        var code = "var a = {test() {return true;}}";
+        assert.equal(Uglify.minify(code, {fromString: true}).code, "var a={test(){return!0}};");
+    });
+
+    it("Should not allow objects to use static keywords like in classes", function() {
+        var code = "{static test() {}}";
+        var parse = function() {
+            Uglify.parse(code);
+        }
+        var expect = function(e) {
+            return e instanceof Uglify.JS_Parse_Error;
+        }
+        assert.throws(parse, expect);
+    });
+
+    it("Should not allow objects to have static computed properties like in classes", function() {
+        var code = "var foo = {static [123](){}}";
+        var parse = function() {
+            console.log(Uglify.parse(code).body[0].body[0]);
+        }
+        var expect = function(e) {
+            return e instanceof Uglify.JS_Parse_Error;
+        }
+        assert.throws(parse, expect);
+    });
+    it("Should not accept operator tokens as property/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"
+                });
+                results.push({
+                    code: "var obj = { " + illegalOperators[i] + ': "123"};',
+                    operator: illegalOperators[i],
+                    method: "key"
+                });
+                results.push({
+                    code: "var obj = { " + illegalOperators[i] + "(){ return test; }};",
+                    operator: illegalOperators[i],
+                    method: "method"
+                });
+            }
+
+            return results;
+        };
+
+        var testCase = function(data) {
+            return function() {
+                Uglify.parse(data.code);
+            };
+        };
+
+        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 === "*")
+                );
+            };
+        };
+
+        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));
+        }
+    });
+    it("Should be able to use shorthand properties", function() {
+        var ast = Uglify.parse("var foo = 123\nvar obj = {foo: foo}");
+        assert.strictEqual(ast.print_to_string({ecma: 6}), "var foo=123;var obj={foo};");
+    })
+});

test/mocha/operator.js

@@ -1,489 +0,0 @@
-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/string-literal.js

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