[ES6] Implemented parse for export Name from Module variants. (#1701)

- add `AST_Export` new variants output
- add tests to `test/compress/`
- update `$propdoc` of `AST_Export` ("exported_names" & "module_name")
- add tests for `export ...  as ...` variants

.github/ISSUE_TEMPLATE.md

@@ -1,27 +1,9 @@
-**Bug report or feature request?** 
-
-<!-- Note: sub-optimal but correct code is not a bug -->
-
-**ES5 or ES6+ input?** 
-
-<!-- Note: for ES6 see: https://github.com/mishoo/UglifyJS2/tree/harmony#harmony -->
-
-**Uglify version (`uglifyjs -V`)**
-
-**JavaScript input**
-
+- Bug report or feature request? <!-- Note: sub-optimal but correct code is not a bug -->
+- `uglify-js` version (`uglifyjs -V`)
+- JavaScript input - ideally as small as possible.
+- The `uglifyjs` CLI command executed or `minify()` options used.
+- An example of JavaScript output produced and/or the error or warning.
 <!--
-    A complete parsable JS program exhibiting the issue with
-    UglifyJS alone - without third party tools or libraries.
-    Ideally the input should be as small as possible.
-    Post a link to a gist if necessary.
--->
-
-**The `uglifyjs` CLI command executed or `minify()` options used.**
-
-**JavaScript output or error produced.**
-
-<!--
-    Note: `uglify-js` only supports ES5. 
-    Those wishing to minify ES6 should use `uglify-es`.
+    Note: the release version of uglify-js only supports ES5. Those wishing
+    to minify ES6 should use the experimental harmony branch.
 -->

.travis.yml

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

bin/extract-props.js

@@ -0,0 +1,77 @@
+#! /usr/bin/env node
+
+"use strict";
+
+var U2 = require("../tools/node");
+var fs = require("fs");
+var yargs = require("yargs");
+var ARGS = yargs
+    .describe("o", "Output file")
+    .argv;
+var files = ARGS._.slice();
+var output = {
+    vars: {},
+    props: {}
+};
+
+if (ARGS.o) try {
+    output = JSON.parse(fs.readFileSync(ARGS.o, "utf8"));
+} catch(ex) {}
+
+files.forEach(getProps);
+
+if (ARGS.o) {
+    fs.writeFileSync(ARGS.o, JSON.stringify(output, null, 2), "utf8");
+} else {
+    console.log("%s", JSON.stringify(output, null, 2));
+}
+
+function getProps(filename) {
+    var code = fs.readFileSync(filename, "utf8");
+    var ast = U2.parse(code);
+
+    ast.walk(new U2.TreeWalker(function(node){
+        if (node instanceof U2.AST_ObjectKeyVal) {
+            add(node.key);
+        }
+        else if (node instanceof U2.AST_ObjectProperty) {
+            add(node.key.name);
+        }
+        else if (node instanceof U2.AST_Dot) {
+            add(node.property);
+        }
+        else if (node instanceof U2.AST_Sub) {
+            addStrings(node.property);
+        }
+    }));
+
+    function addStrings(node) {
+        var out = {};
+        try {
+            (function walk(node){
+                node.walk(new U2.TreeWalker(function(node){
+                    if (node instanceof U2.AST_Seq) {
+                        walk(node.cdr);
+                        return true;
+                    }
+                    if (node instanceof U2.AST_String) {
+                        add(node.value);
+                        return true;
+                    }
+                    if (node instanceof U2.AST_Conditional) {
+                        walk(node.consequent);
+                        walk(node.alternative);
+                        return true;
+                    }
+                    throw out;
+                }));
+            })(node);
+        } catch(ex) {
+            if (ex !== out) throw ex;
+        }
+    }
+
+    function add(name) {
+        output.props[name] = true;
+    }
+}

lib/ast.js

@@ -134,10 +134,11 @@ var AST_Debugger = DEFNODE("Debugger", null, {
     $documentation: "Represents a debugger statement",
 }, AST_Statement);
 
-var AST_Directive = DEFNODE("Directive", "value quote", {
+var AST_Directive = DEFNODE("Directive", "value scope quote", {
     $documentation: "Represents a directive, like \"use strict\";",
     $propdoc: {
         value: "[string] The value of this directive as a plain string (it's not an AST_String!)",
+        scope: "[AST_Scope/S] The scope that this directive affects",
         quote: "[string] the original quote character"
     },
 }, AST_Statement);
@@ -156,7 +157,7 @@ var AST_SimpleStatement = DEFNODE("SimpleStatement", "body", {
 
 function walk_body(node, visitor) {
     var body = node.body;
-    if (body instanceof AST_Statement) {
+    if (body instanceof AST_Node) {
         body._walk(visitor);
     }
     else for (var i = 0, len = body.length; i < len; i++) {
@@ -181,13 +182,21 @@ var AST_BlockStatement = DEFNODE("BlockStatement", null, {
 }, AST_Block);
 
 var AST_EmptyStatement = DEFNODE("EmptyStatement", null, {
-    $documentation: "The empty statement (empty block or simply a semicolon)"
+    $documentation: "The empty statement (empty block or simply a semicolon)",
+    _walk: function(visitor) {
+        return visitor._visit(this);
+    }
 }, AST_Statement);
 
 var AST_StatementWithBody = DEFNODE("StatementWithBody", "body", {
     $documentation: "Base class for all statements that contain one nested body: `For`, `ForIn`, `Do`, `While`, `With`",
     $propdoc: {
         body: "[AST_Statement] the body; this should always be present, even if it's an AST_EmptyStatement"
+    },
+    _walk: function(visitor) {
+        return visitor._visit(this, function(){
+            this.body._walk(visitor);
+        });
     }
 }, AST_Statement);
 
@@ -205,13 +214,12 @@ var AST_LabeledStatement = DEFNODE("LabeledStatement", "label", {
     clone: function(deep) {
         var node = this._clone(deep);
         if (deep) {
-            var label = node.label;
-            var def = this.label;
+            var refs = node.label.references;
+            var label = this.label;
             node.walk(new TreeWalker(function(node) {
                 if (node instanceof AST_LoopControl
-                    && node.label && node.label.thedef === def) {
-                    node.label.thedef = label;
-                    label.references.push(node);
+                    && node.label && node.label.thedef === label) {
+                    refs.push(node);
                 }
             }));
         }
@@ -283,6 +291,10 @@ 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: {
@@ -298,9 +310,10 @@ var AST_With = DEFNODE("With", "expression", {
 
 /* -----[ scope and functions ]----- */
 
-var AST_Scope = DEFNODE("Scope", "variables functions uses_with uses_eval parent_scope enclosed cname", {
+var AST_Scope = DEFNODE("Scope", "directives variables functions uses_with uses_eval parent_scope enclosed cname", {
     $documentation: "Base class for all statements introducing a lexical scope",
     $propdoc: {
+        directives: "[string*/S] an array of directives declared in this scope",
         variables: "[Object/S] a map of name -> SymbolDef for all variables/functions defined in this scope",
         functions: "[Object/S] like `variables`, but only lists function declarations",
         uses_with: "[boolean/S] tells whether this scope uses the `with` statement",
@@ -309,6 +322,13 @@ var AST_Scope = DEFNODE("Scope", "variables functions uses_with uses_eval parent
         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", {
@@ -316,26 +336,169 @@ var AST_Toplevel = DEFNODE("Toplevel", "globals", {
     $propdoc: {
         globals: "[Object/S] a map of name -> SymbolDef for all undeclared names",
     },
-    wrap_commonjs: function(name) {
-        var body = this.body;
-        var wrapped_tl = "(function(exports){'$ORIG';})(typeof " + name + "=='undefined'?(" + name + "={}):" + name + ");";
+    wrap_enclose: function(arg_parameter_pairs) {
+        var self = this;
+        var args = [];
+        var parameters = [];
+
+        arg_parameter_pairs.forEach(function(pair) {
+            var splitAt = pair.lastIndexOf(":");
+
+            args.push(pair.substr(0, splitAt));
+            parameters.push(pair.substr(splitAt + 1));
+        });
+
+        var wrapped_tl = "(function(" + parameters.join(",") + "){ '$ORIG'; })(" + args.join(",") + ")";
         wrapped_tl = parse(wrapped_tl);
         wrapped_tl = wrapped_tl.transform(new TreeTransformer(function before(node){
             if (node instanceof AST_Directive && node.value == "$ORIG") {
-                return MAP.splice(body);
+                return MAP.splice(self.body);
+            }
+        }));
+        return wrapped_tl;
+    },
+    wrap_commonjs: function(name, export_all) {
+        var self = this;
+        var to_export = [];
+        if (export_all) {
+            self.figure_out_scope();
+            self.walk(new TreeWalker(function(node){
+                if (node instanceof AST_SymbolDeclaration && node.definition().global) {
+                    if (!find_if(function(n){ return n.name == node.name }, to_export))
+                        to_export.push(node);
+                }
+            }));
+        }
+        var wrapped_tl = "(function(exports, global){ '$ORIG'; '$EXPORTS'; global['" + name + "'] = exports; }({}, (function(){return this}())))";
+        wrapped_tl = parse(wrapped_tl);
+        wrapped_tl = wrapped_tl.transform(new TreeTransformer(function before(node){
+            if (node instanceof AST_Directive) {
+                switch (node.value) {
+                  case "$ORIG":
+                    return MAP.splice(self.body);
+                  case "$EXPORTS":
+                    var body = [];
+                    to_export.forEach(function(sym){
+                        body.push(new AST_SimpleStatement({
+                            body: new AST_Assign({
+                                left: new AST_Sub({
+                                    expression: new AST_SymbolRef({ name: "exports" }),
+                                    property: new AST_String({ value: sym.name }),
+                                }),
+                                operator: "=",
+                                right: new AST_SymbolRef(sym),
+                            }),
+                        }));
+                    });
+                    return MAP.splice(body);
+                }
             }
         }));
         return wrapped_tl;
     }
 }, 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) {
+            var insert_default = function(ex, default_value) {
+                if (default_value) {
+                    return new AST_DefaultAssign({
+                        start: ex.start,
+                        left: ex,
+                        operator: "=",
+                        right: default_value,
+                        end: default_value.end
+                    });
+                }
+                return ex;
+            }
+            if (ex instanceof AST_Object) {
+                return insert_default(new AST_Destructuring({
+                    start: ex.start,
+                    end: ex.end,
+                    is_array: false,
+                    names: ex.properties.map(to_fun_args)
+                }), default_seen_above);
+            } else if (ex instanceof AST_ObjectKeyVal) {
+                if (ex.key instanceof AST_SymbolRef) {
+                    ex.key = to_fun_args(ex.key, 0, [ex.key]);
+                }
+                ex.value = to_fun_args(ex.value, 0, [ex.key]);
+                return insert_default(ex, default_seen_above);
+            } else if (ex instanceof AST_Hole) {
+                return ex;
+            } else if (ex instanceof AST_Destructuring) {
+                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 insert_default(ex, default_seen_above);
+            } else if (ex instanceof AST_SymbolRef) {
+                return insert_default(new AST_SymbolFunarg({
+                    name: ex.name,
+                    start: ex.start,
+                    end: ex.end
+                }), default_seen_above);
+            } else if (ex instanceof AST_Expansion) {
+                ex.expression = to_fun_args(ex.expression);
+                return insert_default(ex, default_seen_above);
+            } else if (ex instanceof AST_Array) {
+                return insert_default(new AST_Destructuring({
+                    start: ex.start,
+                    end: ex.end,
+                    is_array: true,
+                    names: ex.elements.map(to_fun_args)
+                }), default_seen_above);
+            } else if (ex instanceof AST_Assign) {
+                return insert_default(to_fun_args(ex.left, undefined, undefined, ex.right), default_seen_above);
+            } else {
+                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|AST_DefaultAssign*] array of function arguments, destructurings, or expanding arguments",
         uses_arguments: "[boolean/S] tells whether this function accesses the arguments array"
     },
+    args_as_names: function () {
+        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);
@@ -356,10 +519,78 @@ 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", {
+    $documentation: "A destructuring of several names. Used in destructuring assignment and with destructuring function argument names",
+    $propdoc: {
+        "names": "[AST_Node*] Array of properties or elements",
+        "is_array": "[Boolean] Whether the destructuring represents an object or array"
+    },
+    _walk: function(visitor) {
+        return visitor._visit(this, function(){
+            this.names.forEach(function(name){
+                name._walk(visitor);
+            });
+        });
+    },
+    all_symbols: function() {
+        var out = [];
+        this.walk(new TreeWalker(function (node) {
+            if (node instanceof AST_Symbol) {
+                out.push(node);
+            }
+            if (node instanceof AST_Expansion) {
+                out.push(node.expression);
+            }
+        }));
+        return out;
+    }
+});
+
+var AST_PrefixedTemplateString = DEFNODE("PrefixedTemplateString", "template_string prefix", {
+    $documentation: "A templatestring with a prefix, such as String.raw`foobarbaz`",
+    $propdoc: {
+        template_string: "[AST_TemplateString] The template string",
+        prefix: "[AST_SymbolRef|AST_PropAccess] The prefix, which can be a symbol such as `foo` or a dotted expression such as `String.raw`."
+    },
+    _walk: function(visitor) {
+        this.prefix._walk(visitor);
+        this.template_string._walk(visitor);
+    }
+})
+
+var AST_TemplateString = DEFNODE("TemplateString", "segments", {
+    $documentation: "A template string literal",
+    $propdoc: {
+        segments: "[AST_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, {
@@ -479,7 +710,7 @@ var AST_Try = DEFNODE("Try", "bcatch bfinally", {
 var AST_Catch = DEFNODE("Catch", "argname", {
     $documentation: "A `catch` node; only makes sense as part of a `try` statement",
     $propdoc: {
-        argname: "[AST_SymbolCatch] symbol for the exception"
+        argname: "[AST_SymbolCatch|AST_Destructuring|AST_Expansion|AST_DefaultAssign] symbol for the exception"
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
@@ -493,10 +724,10 @@ var AST_Finally = DEFNODE("Finally", null, {
     $documentation: "A `finally` node; only makes sense as part of a `try` statement"
 }, AST_Block);
 
-/* -----[ VAR ]----- */
+/* -----[ VAR/CONST ]----- */
 
 var AST_Definitions = DEFNODE("Definitions", "definitions", {
-    $documentation: "Base class for `var` nodes (variable declarations/initializations)",
+    $documentation: "Base class for `var` or `const` nodes (variable declarations/initializations)",
     $propdoc: {
         definitions: "[AST_VarDef*] array of variable definitions"
     },
@@ -514,10 +745,75 @@ 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 exported_names module_name", {
+    $documentation: "An `export` statement",
+    $propdoc: {
+        exported_definition: "[AST_Defun|AST_Definitions|AST_DefClass?] An exported definition",
+        exported_value: "[AST_Node?] An exported value",
+        exported_names: "[AST_NameImport*?] List of exported names",
+        module_name: "[AST_String?] Name of the file to load exports from",
+        is_default: "[Boolean] Whether this is the default exported value of this module"
+    },
+    _walk: function (visitor) {
+        visitor._visit(this, function () {
+            if (this.exported_definition) {
+                this.exported_definition._walk(visitor);
+            }
+            if (this.exported_value) {
+                this.exported_value._walk(visitor);
+            }
+        });
+    }
+}, AST_Statement);
+
 var AST_VarDef = DEFNODE("VarDef", "name value", {
     $documentation: "A variable declaration; only appears in a AST_Definitions node",
     $propdoc: {
-        name: "[AST_SymbolVar] name of the variable",
+        name: "[AST_SymbolVar|AST_SymbolConst|AST_Destructuring] name of the variable",
         value: "[AST_Node?] initializer, or null of there's no initializer"
     },
     _walk: function(visitor) {
@@ -538,11 +834,11 @@ 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.expression._walk(visitor);
         });
     }
 });
@@ -551,16 +847,68 @@ var AST_New = DEFNODE("New", null, {
     $documentation: "An object instantiation.  Derives from a function call since it has exactly the same properties"
 }, AST_Call);
 
-var AST_Sequence = DEFNODE("Sequence", "expressions", {
-    $documentation: "A sequence expression (comma-separated expressions)",
+var AST_Seq = DEFNODE("Seq", "car cdr", {
+    $documentation: "A sequence expression (two comma-separated expressions)",
     $propdoc: {
-        expressions: "[AST_Node*] array of expressions (at least two)"
+        car: "[AST_Node] first element in sequence",
+        cdr: "[AST_Node] second element in sequence"
+    },
+    $cons: function(x, y) {
+        var seq = new AST_Seq(x);
+        seq.car = x;
+        seq.cdr = y;
+        return seq;
+    },
+    $from_array: function(array) {
+        if (array.length == 0) return null;
+        if (array.length == 1) return array[0].clone();
+        var list = null;
+        for (var i = array.length; --i >= 0;) {
+            list = AST_Seq.cons(array[i], list);
+        }
+        var p = list;
+        while (p) {
+            if (p.cdr && !p.cdr.cdr) {
+                p.cdr = p.cdr.car;
+                break;
+            }
+            p = p.cdr;
+        }
+        return list;
+    },
+    to_array: function() {
+        var p = this, a = [];
+        while (p) {
+            a.push(p.car);
+            if (p.cdr && !(p.cdr instanceof AST_Seq)) {
+                a.push(p.cdr);
+                break;
+            }
+            p = p.cdr;
+        }
+        return a;
+    },
+    add: function(node) {
+        var p = this;
+        while (p) {
+            if (!(p.cdr instanceof AST_Seq)) {
+                var cell = AST_Seq.cons(p.cdr, node);
+                return p.cdr = cell;
+            }
+            p = p.cdr;
+        }
+    },
+    len: function() {
+        if (this.cdr instanceof AST_Seq) {
+            return this.cdr.len() + 1;
+        } else {
+            return 2;
+        }
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
-            this.expressions.forEach(function(node) {
-                node._walk(visitor);
-            });
+            this.car._walk(visitor);
+            if (this.cdr) this.cdr._walk(visitor);
         });
     }
 });
@@ -613,7 +961,7 @@ var AST_UnaryPostfix = DEFNODE("UnaryPostfix", null, {
     $documentation: "Unary postfix expression, i.e. `i++`"
 }, AST_Unary);
 
-var AST_Binary = DEFNODE("Binary", "operator left right", {
+var AST_Binary = DEFNODE("Binary", "left operator right", {
     $documentation: "Binary expression, i.e. `a + b`",
     $propdoc: {
         left: "[AST_Node] left-hand side expression",
@@ -648,6 +996,10 @@ var AST_Assign = DEFNODE("Assign", null, {
     $documentation: "An assignment expression — `a = b + 5`",
 }, AST_Binary);
 
+var AST_DefaultAssign = DEFNODE("DefaultAssign", null, {
+    $documentation: "A default assignment expression like in `(a = 3) => a`"
+}, AST_Binary);
+
 /* -----[ LITERALS ]----- */
 
 var AST_Array = DEFNODE("Array", "elements", {
@@ -683,11 +1035,13 @@ 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 AST_SymbolAccessor.",
-        value: "[AST_Node] property value.  For setters and getters this is an AST_Accessor."
+        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."
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
+            if (this.key instanceof AST_Node)
+                this.key._walk(visitor);
             this.value._walk(visitor);
         });
     }
@@ -700,21 +1054,72 @@ var AST_ObjectKeyVal = DEFNODE("ObjectKeyVal", "quote", {
     }
 }, 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_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", {
     $propdoc: {
         name: "[string] name of this symbol",
         scope: "[AST_Scope/S] the current scope (not necessarily the definition scope)",
         thedef: "[SymbolDef/S] the definition of this symbol"
     },
-    $documentation: "Base class for all symbols",
+    $documentation: "Base class for all symbols"
+});
+
+var AST_NewTarget = DEFNODE("NewTarget", null, {
+    $documentation: "A reference to new.target"
 });
 
 var AST_SymbolAccessor = DEFNODE("SymbolAccessor", null, {
@@ -722,13 +1127,25 @@ var AST_SymbolAccessor = DEFNODE("SymbolAccessor", null, {
 }, AST_Symbol);
 
 var AST_SymbolDeclaration = DEFNODE("SymbolDeclaration", "init", {
-    $documentation: "A declaration symbol (symbol in var, function name or argument, symbol in catch)",
+    $documentation: "A declaration symbol (symbol in var/const, function name or argument, symbol in catch)",
 }, AST_Symbol);
 
 var AST_SymbolVar = DEFNODE("SymbolVar", null, {
     $documentation: "Symbol defining a variable",
 }, AST_SymbolDeclaration);
 
+var AST_SymbolBlockDeclaration = DEFNODE("SymbolBlockDeclaration", null, {
+    $documentation: "Base class for block-scoped declaration symbols"
+}, AST_SymbolDeclaration);
+
+var AST_SymbolConst = DEFNODE("SymbolConst", null, {
+    $documentation: "A constant declaration"
+}, AST_SymbolBlockDeclaration);
+
+var AST_SymbolLet = DEFNODE("SymbolLet", null, {
+    $documentation: "A block-scoped `let` declaration"
+}, AST_SymbolBlockDeclaration);
+
 var AST_SymbolFunarg = DEFNODE("SymbolFunarg", null, {
     $documentation: "Symbol naming a function argument",
 }, AST_SymbolVar);
@@ -737,13 +1154,33 @@ 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)",
@@ -768,6 +1205,10 @@ 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() {
@@ -841,6 +1282,21 @@ 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) {
@@ -857,22 +1313,28 @@ TreeWalker.prototype = {
         if (!ret && descend) {
             descend.call(node);
         }
-        this.pop();
+        this.pop(node);
         return ret;
     },
     parent: function(n) {
         return this.stack[this.stack.length - 2 - (n || 0)];
     },
-    push: function(node) {
+    push: function (node) {
         if (node instanceof AST_Lambda) {
             this.directives = Object.create(this.directives);
         } else if (node instanceof AST_Directive && !this.directives[node.value]) {
             this.directives[node.value] = node;
+        } else if (node instanceof AST_Class) {
+            this.directives = Object.create(this.directives);
+            if (!this.directives["use strict"]) {
+                this.directives["use strict"] = node;
+            }
         }
         this.stack.push(node);
     },
-    pop: function() {
-        if (this.stack.pop() instanceof AST_Lambda) {
+    pop: function(node) {
+        this.stack.pop();
+        if (node instanceof AST_Lambda || node instanceof AST_Class) {
             this.directives = Object.getPrototypeOf(this.directives);
         }
     },
@@ -890,7 +1352,7 @@ 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;
@@ -916,16 +1378,16 @@ TreeWalker.prototype = {
             self = p;
         }
     },
-    loopcontrol_target: function(node) {
+    loopcontrol_target: function(label) {
         var stack = this.stack;
-        if (node.label) for (var i = stack.length; --i >= 0;) {
+        if (label) for (var i = stack.length; --i >= 0;) {
             var x = stack[i];
-            if (x instanceof AST_LabeledStatement && x.label.name == node.label.name)
+            if (x instanceof AST_LabeledStatement && x.label.name == label.name) {
                 return x.body;
+            }
         } else for (var i = stack.length; --i >= 0;) {
             var x = stack[i];
-            if (x instanceof AST_IterationStatement
-                || node instanceof AST_Break && x instanceof AST_Switch)
+            if (x instanceof AST_Switch || x instanceof AST_IterationStatement)
                 return x;
         }
     }

lib/minify.js

@@ -1,220 +0,0 @@
-"use strict";
-
-var to_ascii = typeof atob == "undefined" ? function(b64) {
-    return new Buffer(b64, "base64").toString();
-} : atob;
-var to_base64 = typeof btoa == "undefined" ? function(str) {
-    return new Buffer(str).toString("base64");
-} : btoa;
-
-function read_source_map(code) {
-    var match = /\n\/\/# sourceMappingURL=data:application\/json(;.*?)?;base64,(.*)/.exec(code);
-    if (!match) {
-        AST_Node.warn("inline source map not found");
-        return null;
-    }
-    return to_ascii(match[2]);
-}
-
-function set_shorthand(name, options, keys) {
-    if (options[name]) {
-        keys.forEach(function(key) {
-            if (options[key]) {
-                if (typeof options[key] != "object") options[key] = {};
-                if (!(name in options[key])) options[key][name] = options[name];
-            }
-        });
-    }
-}
-
-function init_cache(cache) {
-    if (!cache) return;
-    if (!("cname" in cache)) cache.cname = -1;
-    if (!("props" in cache)) {
-        cache.props = new Dictionary();
-    } else if (!(cache.props instanceof Dictionary)) {
-        cache.props = Dictionary.fromObject(cache.props);
-    }
-}
-
-function to_json(cache) {
-    return {
-        cname: cache.cname,
-        props: cache.props.toObject()
-    };
-}
-
-function minify(files, options) {
-    var warn_function = AST_Node.warn_function;
-    try {
-        options = defaults(options, {
-            compress: {},
-            ie8: false,
-            keep_fnames: false,
-            mangle: {},
-            nameCache: null,
-            output: {},
-            parse: {},
-            sourceMap: false,
-            timings: false,
-            toplevel: false,
-            warnings: false,
-            wrap: false,
-        }, true);
-        var timings = options.timings && {
-            start: Date.now()
-        };
-        set_shorthand("ie8", options, [ "compress", "mangle", "output" ]);
-        set_shorthand("keep_fnames", options, [ "compress", "mangle" ]);
-        set_shorthand("toplevel", options, [ "compress", "mangle" ]);
-        set_shorthand("warnings", options, [ "compress" ]);
-        var quoted_props;
-        if (options.mangle) {
-            options.mangle = defaults(options.mangle, {
-                cache: options.nameCache && (options.nameCache.vars || {}),
-                eval: false,
-                ie8: false,
-                keep_fnames: false,
-                properties: false,
-                reserved: [],
-                toplevel: false,
-            }, true);
-            if (options.mangle.properties) {
-                if (typeof options.mangle.properties != "object") {
-                    options.mangle.properties = {};
-                }
-                if (options.mangle.properties.keep_quoted) {
-                    quoted_props = options.mangle.properties.reserved;
-                    if (!Array.isArray(quoted_props)) quoted_props = [];
-                    options.mangle.properties.reserved = quoted_props;
-                }
-                if (options.nameCache && !("cache" in options.mangle.properties)) {
-                    options.mangle.properties.cache = options.nameCache.props || {};
-                }
-            }
-            init_cache(options.mangle.cache);
-            init_cache(options.mangle.properties.cache);
-        }
-        if (options.sourceMap) {
-            options.sourceMap = defaults(options.sourceMap, {
-                content: null,
-                filename: null,
-                includeSources: false,
-                root: null,
-                url: null,
-            }, true);
-        }
-        var warnings = [];
-        if (options.warnings && !AST_Node.warn_function) {
-            AST_Node.warn_function = function(warning) {
-                warnings.push(warning);
-            };
-        }
-        if (timings) timings.parse = Date.now();
-        var toplevel;
-        if (files instanceof AST_Toplevel) {
-            toplevel = files;
-        } else {
-            if (typeof files == "string") {
-                files = [ files ];
-            }
-            options.parse = options.parse || {};
-            options.parse.toplevel = null;
-            for (var name in files) if (HOP(files, name)) {
-                options.parse.filename = name;
-                options.parse.toplevel = parse(files[name], options.parse);
-                if (options.sourceMap && options.sourceMap.content == "inline") {
-                    if (Object.keys(files).length > 1)
-                        throw new Error("inline source map only works with singular input");
-                    options.sourceMap.content = read_source_map(files[name]);
-                }
-            }
-            toplevel = options.parse.toplevel;
-        }
-        if (quoted_props) {
-            reserve_quoted_keys(toplevel, quoted_props);
-        }
-        if (options.wrap) {
-            toplevel = toplevel.wrap_commonjs(options.wrap);
-        }
-        if (timings) timings.scope1 = Date.now();
-        if (options.compress) toplevel.figure_out_scope(options.mangle);
-        if (timings) timings.compress = Date.now();
-        if (options.compress) toplevel = new Compressor(options.compress).compress(toplevel);
-        if (timings) timings.scope2 = Date.now();
-        if (options.mangle) toplevel.figure_out_scope(options.mangle);
-        if (timings) timings.mangle = Date.now();
-        if (options.mangle) {
-            base54.reset();
-            toplevel.compute_char_frequency(options.mangle);
-            toplevel.mangle_names(options.mangle);
-        }
-        if (timings) timings.properties = Date.now();
-        if (options.mangle && options.mangle.properties) {
-            toplevel = mangle_properties(toplevel, options.mangle.properties);
-        }
-        if (timings) timings.output = Date.now();
-        var result = {};
-        if (options.output.ast) {
-            result.ast = toplevel;
-        }
-        if (!HOP(options.output, "code") || options.output.code) {
-            if (options.sourceMap) {
-                if (typeof options.sourceMap.content == "string") {
-                    options.sourceMap.content = JSON.parse(options.sourceMap.content);
-                }
-                options.output.source_map = SourceMap({
-                    file: options.sourceMap.filename,
-                    orig: options.sourceMap.content,
-                    root: options.sourceMap.root
-                });
-                if (options.sourceMap.includeSources) {
-                    if (files instanceof AST_Toplevel) {
-                        throw new Error("original source content unavailable");
-                    } else for (var name in files) if (HOP(files, name)) {
-                        options.output.source_map.get().setSourceContent(name, files[name]);
-                    }
-                }
-            }
-            delete options.output.ast;
-            delete options.output.code;
-            var stream = OutputStream(options.output);
-            toplevel.print(stream);
-            result.code = stream.get();
-            if (options.sourceMap) {
-                result.map = options.output.source_map.toString();
-                if (options.sourceMap.url == "inline") {
-                    result.code += "\n//# sourceMappingURL=data:application/json;charset=utf-8;base64," + to_base64(result.map);
-                } else if (options.sourceMap.url) {
-                    result.code += "\n//# sourceMappingURL=" + options.sourceMap.url;
-                }
-            }
-        }
-        if (options.nameCache && options.mangle) {
-            if (options.mangle.cache) options.nameCache.vars = to_json(options.mangle.cache);
-            if (options.mangle.properties && options.mangle.properties.cache) {
-                options.nameCache.props = to_json(options.mangle.properties.cache);
-            }
-        }
-        if (timings) {
-            timings.end = Date.now();
-            result.timings = {
-                parse: 1e-3 * (timings.scope1 - timings.parse),
-                scope: 1e-3 * (timings.compress - timings.scope1 + timings.mangle - timings.scope2),
-                compress: 1e-3 * (timings.scope2 - timings.compress),
-                mangle: 1e-3 * (timings.properties - timings.mangle),
-                properties: 1e-3 * (timings.output - timings.properties),
-                output: 1e-3 * (timings.end - timings.output),
-                total: 1e-3 * (timings.end - timings.start)
-            }
-        }
-        if (warnings.length) {
-            result.warnings = warnings;
-        }
-        return result;
-    } catch (ex) {
-        return { error: ex };
-    } finally {
-        AST_Node.warn_function = warn_function;
-    }
-}

lib/mozilla-ast.js

@@ -111,19 +111,23 @@
         },
         Property: function(M) {
             var key = M.key;
+            var name = key.type == "Identifier" ? key.name : key.value;
             var args = {
                 start    : my_start_token(key),
                 end      : my_end_token(M.value),
-                key      : key.type == "Identifier" ? key.name : key.value,
+                key      : name,
                 value    : from_moz(M.value)
             };
-            if (M.kind == "init") return new AST_ObjectKeyVal(args);
-            args.key = new AST_SymbolAccessor({
-                name: args.key
-            });
-            args.value = new AST_Accessor(args.value);
-            if (M.kind == "get") return new AST_ObjectGetter(args);
-            if (M.kind == "set") return new AST_ObjectSetter(args);
+            switch (M.kind) {
+              case "init":
+                return new AST_ObjectKeyVal(args);
+              case "set":
+                args.value.name = from_moz(key);
+                return new AST_ObjectSetter(args);
+              case "get":
+                args.value.name = from_moz(key);
+                return new AST_ObjectGetter(args);
+            }
         },
         ArrayExpression: function(M) {
             return new AST_Array({
@@ -145,11 +149,7 @@
             });
         },
         SequenceExpression: function(M) {
-            return new AST_Sequence({
-                start      : my_start_token(M),
-                end        : my_end_token(M),
-                expressions: M.expressions.map(from_moz)
-            });
+            return AST_Seq.from_array(M.expressions.map(from_moz));
         },
         MemberExpression: function(M) {
             return new (M.computed ? AST_Sub : AST_Dot)({
@@ -168,7 +168,7 @@
             });
         },
         VariableDeclaration: function(M) {
-            return new AST_Var({
+            return new (M.kind === "const" ? AST_Const : AST_Var)({
                 start       : my_start_token(M),
                 end         : my_end_token(M),
                 definitions : M.declarations.map(from_moz)
@@ -204,7 +204,7 @@
         Identifier: function(M) {
             var p = FROM_MOZ_STACK[FROM_MOZ_STACK.length - 2];
             return new (  p.type == "LabeledStatement" ? AST_Label
-                        : p.type == "VariableDeclarator" && p.id === M ? AST_SymbolVar
+                        : p.type == "VariableDeclarator" && p.id === M ? (p.kind == "const" ? AST_SymbolConst : AST_SymbolVar)
                         : p.type == "FunctionExpression" ? (p.id === M ? AST_SymbolLambda : AST_SymbolFunarg)
                         : p.type == "FunctionDeclaration" ? (p.id === M ? AST_SymbolDefun : AST_SymbolFunarg)
                         : p.type == "CatchClause" ? AST_SymbolCatch
@@ -256,7 +256,10 @@
     map("CallExpression", AST_Call, "callee>expression, arguments@args");
 
     def_to_moz(AST_Toplevel, function To_Moz_Program(M) {
-        return to_moz_scope("Program", M);
+        return {
+            type: "Program",
+            body: M.body.map(to_moz)
+        };
     });
 
     def_to_moz(AST_Defun, function To_Moz_FunctionDeclaration(M) {
@@ -264,7 +267,7 @@
             type: "FunctionDeclaration",
             id: to_moz(M.name),
             params: M.argnames.map(to_moz),
-            body: to_moz_scope("BlockStatement", M)
+            body: to_moz_block(M)
         }
     });
 
@@ -273,7 +276,7 @@
             type: "FunctionExpression",
             id: to_moz(M.name),
             params: M.argnames.map(to_moz),
-            body: to_moz_scope("BlockStatement", M)
+            body: to_moz_block(M)
         }
     });
 
@@ -324,15 +327,15 @@
     def_to_moz(AST_Definitions, function To_Moz_VariableDeclaration(M) {
         return {
             type: "VariableDeclaration",
-            kind: "var",
+            kind: M instanceof AST_Const ? "const" : "var",
             declarations: M.definitions.map(to_moz)
         };
     });
 
-    def_to_moz(AST_Sequence, function To_Moz_SequenceExpression(M) {
+    def_to_moz(AST_Seq, function To_Moz_SequenceExpression(M) {
         return {
             type: "SequenceExpression",
-            expressions: M.expressions.map(to_moz)
+            expressions: M.to_array().map(to_moz)
         };
     });
 
@@ -379,10 +382,11 @@
     });
 
     def_to_moz(AST_ObjectProperty, function To_Moz_Property(M) {
-        var key = {
-            type: "Literal",
-            value: M.key instanceof AST_SymbolAccessor ? M.key.name : M.key
-        };
+        var key = (
+            is_identifier(M.key)
+            ? {type: "Identifier", name: M.key}
+            : {type: "Literal", value: M.key}
+        );
         var kind;
         if (M instanceof AST_ObjectKeyVal) {
             kind = "init";
@@ -543,8 +547,8 @@
         moz_to_me = new Function("U2", "my_start_token", "my_end_token", "from_moz", "return(" + moz_to_me + ")")(
             exports, my_start_token, my_end_token, from_moz
         );
-        me_to_moz = new Function("to_moz", "to_moz_block", "to_moz_scope", "return(" + me_to_moz + ")")(
-            to_moz, to_moz_block, to_moz_scope
+        me_to_moz = new Function("to_moz", "to_moz_block", "return(" + me_to_moz + ")")(
+            to_moz, to_moz_block
         );
         MOZ_TO_ME[moztype] = moz_to_me;
         def_to_moz(mytype, me_to_moz);
@@ -602,14 +606,4 @@
         };
     };
 
-    function to_moz_scope(type, node) {
-        var body = node.body.map(to_moz);
-        if (node.body[0] instanceof AST_SimpleStatement && node.body[0].body instanceof AST_String) {
-            body.unshift(to_moz(new AST_EmptyStatement(node.body[0])));
-        }
-        return {
-            type: type,
-            body: body
-        };
-    };
 })();

lib/propmangle.js

@@ -43,19 +43,28 @@
 
 "use strict";
 
-function find_builtins(reserved) {
-    // NaN will be included due to Number.NaN
-    [
-        "null",
-        "true",
-        "false",
-        "Infinity",
-        "-Infinity",
-        "undefined",
-    ].forEach(add);
+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) {
@@ -63,52 +72,24 @@ function find_builtins(reserved) {
         }
     });
     function add(name) {
-        push_uniq(reserved, name);
+        push_uniq(a, name);
     }
-}
-
-function reserve_quoted_keys(ast, reserved) {
-    function add(name) {
-        push_uniq(reserved, name);
-    }
-
-    ast.walk(new TreeWalker(function(node) {
-        if (node instanceof AST_ObjectKeyVal && node.quote) {
-            add(node.key);
-        } else if (node instanceof AST_Sub) {
-            addStrings(node.property, add);
-        }
-    }));
-}
-
-function addStrings(node, add) {
-    node.walk(new TreeWalker(function(node) {
-        if (node instanceof AST_Sequence) {
-            addStrings(node.expressions[node.expressions.length - 1], add);
-        } else if (node instanceof AST_String) {
-            add(node.value);
-        } else if (node instanceof AST_Conditional) {
-            addStrings(node.consequent, add);
-            addStrings(node.alternative, add);
-        }
-        return true;
-    }));
+    return a;
 }
 
 function mangle_properties(ast, options) {
     options = defaults(options, {
-        builtins: false,
-        cache: null,
-        debug: false,
-        keep_quoted: false,
-        only_cache: false,
-        regex: null,
-        reserved: null,
-    }, true);
+        reserved : null,
+        cache : null,
+        only_cache : false,
+        regex : null,
+        ignore_quoted : false,
+        debug : false
+    });
 
     var reserved = options.reserved;
-    if (!Array.isArray(reserved)) reserved = [];
-    if (!options.builtins) find_builtins(reserved);
+    if (reserved == null)
+        reserved = find_builtins();
 
     var cache = options.cache;
     if (cache == null) {
@@ -119,11 +100,12 @@ function mangle_properties(ast, options) {
     }
 
     var regex = options.regex;
+    var ignore_quoted = options.ignore_quoted;
 
     // note debug is either false (disabled), or a string of the debug suffix to use (enabled).
     // note debug may be enabled as an empty string, which is falsey. Also treat passing 'true'
     // the same as passing an empty string.
-    var debug = options.debug !== false;
+    var debug = (options.debug !== false);
     var debug_name_suffix;
     if (debug) {
         debug_name_suffix = (options.debug === true ? "" : options.debug);
@@ -131,11 +113,12 @@ function mangle_properties(ast, options) {
 
     var names_to_mangle = [];
     var unmangleable = [];
+    var ignored = {};
 
     // step 1: find candidates to mangle
     ast.walk(new TreeWalker(function(node){
         if (node instanceof AST_ObjectKeyVal) {
-            add(node.key);
+            add(node.key, ignore_quoted && node.quote);
         }
         else if (node instanceof AST_ObjectProperty) {
             // setter or getter, since KeyVal is handled above
@@ -145,14 +128,18 @@ function mangle_properties(ast, options) {
             add(node.property);
         }
         else if (node instanceof AST_Sub) {
-            addStrings(node.property, add);
+            addStrings(node.property, ignore_quoted);
+        }
+        else if (node instanceof AST_ConciseMethod) {
+            add(node.name.name);
         }
     }));
 
     // step 2: transform the tree, renaming properties
     return ast.transform(new TreeTransformer(function(node){
         if (node instanceof AST_ObjectKeyVal) {
-            node.key = mangle(node.key);
+            if (!(ignore_quoted && node.quote))
+                node.key = mangle(node.key);
         }
         else if (node instanceof AST_ObjectProperty) {
             // setter or getter
@@ -161,31 +148,56 @@ function mangle_properties(ast, options) {
         else if (node instanceof AST_Dot) {
             node.property = mangle(node.property);
         }
-        else if (!options.keep_quoted && node instanceof AST_Sub) {
-            node.property = mangleStrings(node.property);
+        else if (node instanceof AST_Sub) {
+            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(
+        //             "Found \"{prop}\" property candidate for mangling in an arbitrary string [{file}:{line},{col}]", {
+        //                 file : node.start.file,
+        //                 line : node.start.line,
+        //                 col  : node.start.col,
+        //                 prop : node.value
+        //             }
+        //         );
+        //     }
+        // }
     }));
 
     // 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) {
             return cache.props.has(name);
         }
-        if (/^-?[0-9]+(\.[0-9]+)?(e[+-][0-9]+)?$/.test(name)) return false;
+        if (/^[0-9.]+$/.test(name)) return false;
         return true;
     }
 
     function should_mangle(name) {
+        if (ignore_quoted && name in ignored) return false;
         if (regex && !regex.test(name)) return false;
         if (reserved.indexOf(name) >= 0) return false;
         return cache.props.has(name)
             || names_to_mangle.indexOf(name) >= 0;
     }
 
-    function add(name) {
+    function add(name, ignore) {
+        if (ignore) {
+            ignored[name] = true;
+            return;
+        }
+
         if (can_mangle(name))
             push_uniq(names_to_mangle, name);
 
@@ -205,16 +217,19 @@ function mangle_properties(ast, options) {
                 // debug mode: use a prefix and suffix to preserve readability, e.g. o.foo -> o._$foo$NNN_.
                 var debug_mangled = "_$" + name + "$" + debug_name_suffix + "_";
 
-                if (can_mangle(debug_mangled)) {
+                if (can_mangle(debug_mangled) && !(ignore_quoted && debug_mangled in ignored)) {
                     mangled = debug_mangled;
                 }
             }
 
             // either debug mode is off, or it is on and we could not use the mangled name
             if (!mangled) {
+                // note can_mangle() does not check if the name collides with the 'ignored' set
+                // (filled with quoted properties when ignore_quoted set). Make sure we add this
+                // check so we don't collide with a quoted name.
                 do {
                     mangled = base54(++cache.cname);
-                } while (!can_mangle(mangled));
+                } while (!can_mangle(mangled) || (ignore_quoted && mangled in ignored));
             }
 
             cache.props.set(name, mangled);
@@ -222,11 +237,36 @@ function mangle_properties(ast, options) {
         return mangled;
     }
 
+    function addStrings(node, ignore) {
+        var out = {};
+        try {
+            (function walk(node){
+                node.walk(new TreeWalker(function(node){
+                    if (node instanceof AST_Seq) {
+                        walk(node.cdr);
+                        return true;
+                    }
+                    if (node instanceof AST_String) {
+                        add(node.value, ignore);
+                        return true;
+                    }
+                    if (node instanceof AST_Conditional) {
+                        walk(node.consequent);
+                        walk(node.alternative);
+                        return true;
+                    }
+                    throw out;
+                }));
+            })(node);
+        } catch(ex) {
+            if (ex !== out) throw ex;
+        }
+    }
+
     function mangleStrings(node) {
         return node.transform(new TreeTransformer(function(node){
-            if (node instanceof AST_Sequence) {
-                var last = node.expressions.length - 1;
-                node.expressions[last] = mangleStrings(node.expressions[last]);
+            if (node instanceof AST_Seq) {
+                node.cdr = mangleStrings(node.cdr);
             }
             else if (node instanceof AST_String) {
                 node.value = mangle(node.value);
@@ -238,4 +278,5 @@ function mangle_properties(ast, options) {
             return node;
         }));
     }
+
 }

lib/scope.js

@@ -49,7 +49,9 @@ 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.index = index;
     this.id = SymbolDef.next_id++;
@@ -62,11 +64,17 @@ 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;
@@ -76,10 +84,12 @@ SymbolDef.prototype = {
         else if (!this.mangled_name && !this.unmangleable(options)) {
             var s = this.scope;
             var sym = this.orig[0];
-            if (options.ie8 && sym instanceof AST_SymbolLambda)
+            if (!options.screw_ie8 && sym instanceof AST_SymbolLambda)
                 s = s.parent_scope;
             var def;
-            if (def = this.redefined()) {
+            if (options.screw_ie8
+                && sym instanceof AST_SymbolCatch
+                && (def = s.parent_scope.find_variable(sym))) {
                 this.mangled_name = def.mangled_name || def.name;
             } else
                 this.mangled_name = s.next_mangled(options, this);
@@ -87,16 +97,13 @@ SymbolDef.prototype = {
                 cache.set(this.name, this.mangled_name);
             }
         }
-    },
-    redefined: function() {
-        return this.defun && this.defun.variables.get(this.name);
     }
 };
 
 AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
     options = defaults(options, {
-        cache: null,
-        ie8: false,
+        screw_ie8: true,
+        cache: null
     });
 
     // pass 1: setup scope chaining and handle definitions
@@ -104,15 +111,29 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
     var scope = self.parent_scope = null;
     var labels = new Dictionary();
     var defun = null;
+    var in_destructuring = null;
+    var in_export = false;
+    var in_block = 0;
     var tw = new TreeWalker(function(node, descend){
-        if (node instanceof AST_Catch) {
+        if (node.is_block_scope()) {
             var save_scope = scope;
             scope = new AST_Scope(node);
             scope.init_scope_vars(save_scope);
+            if (!(node instanceof AST_Scope)) {
+                scope.uses_with = save_scope.uses_with;
+                scope.uses_eval = save_scope.uses_eval;
+                scope.directives = save_scope.directives;
+            }
             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(scope);
             var save_scope = scope;
@@ -126,6 +147,22 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
             labels = save_labels;
             return true;        // don't descend again in TreeWalker
         }
+        if (node instanceof AST_Export) {
+            in_export = true;
+            descend();
+            in_export = false;
+            return true;
+        }
+        if (node instanceof AST_BlockStatement
+            || node instanceof AST_Switch
+            || node instanceof AST_Try
+            || node instanceof AST_Catch
+            || node instanceof AST_Finally) {
+            in_block++;
+            descend();
+            in_block--;
+            return true;
+        }
         if (node instanceof AST_LabeledStatement) {
             var l = node.label;
             if (labels.has(l.name)) {
@@ -144,12 +181,15 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
         if (node instanceof AST_Symbol) {
             node.scope = scope;
         }
+        if (node instanceof AST_SymbolFunarg) {
+            node.object_destructuring_arg = !!in_destructuring;
+        }
         if (node instanceof AST_Label) {
             node.thedef = node;
             node.references = [];
         }
         if (node instanceof AST_SymbolLambda) {
-            defun.def_function(node);
+            defun.def_function(node, in_export, in_block);
         }
         else if (node instanceof AST_SymbolDefun) {
             // Careful here, the scope where this should be defined is
@@ -157,10 +197,28 @@ 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, in_block);
         }
-        else if (node instanceof AST_SymbolVar) {
-            defun.def_variable(node);
+        else if (node instanceof AST_SymbolClass) {
+            defun.def_variable(node, in_export, in_block);
+        }
+        else if (node instanceof AST_SymbolImport) {
+            scope.def_variable(node, in_export, in_block);
+        }
+        else if (node instanceof AST_SymbolDefClass) {
+            // This deals with the name of the class being available
+            // inside the class.
+            (node.scope = defun.parent_scope).def_function(node, in_export, in_block);
+        }
+        else if (node instanceof AST_SymbolVar
+            || node instanceof AST_SymbolLet
+            || node instanceof AST_SymbolConst) {
+            var def = ((node instanceof AST_SymbolBlockDeclaration) ? scope : defun).def_variable(node, in_export, in_block);
+            def.destructuring = in_destructuring;
             if (defun !== scope) {
                 node.mark_enclosed(options);
                 var def = scope.find_variable(node);
@@ -171,7 +229,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
             }
         }
         else if (node instanceof AST_SymbolCatch) {
-            scope.def_variable(node).defun = defun;
+            scope.def_variable(node, in_export, in_block);
         }
         else if (node instanceof AST_LabelRef) {
             var sym = labels.get(node.name);
@@ -186,8 +244,24 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
     self.walk(tw);
 
     // pass 2: find back references and eval
-    self.globals = new Dictionary();
+    var func = null;
+    var cls = null;
+    var globals = self.globals = new Dictionary();
     var tw = new TreeWalker(function(node, descend){
+        if (node instanceof AST_Lambda) {
+            var prev_func = func;
+            func = node;
+            descend();
+            func = prev_func;
+            return true;
+        }
+        if (node instanceof AST_Class) {
+            var prev_cls = cls;
+            cls = node;
+            descend();
+            cls = prev_cls;
+            return true;
+        }
         if (node instanceof AST_LoopControl && node.label) {
             node.label.thedef.references.push(node);
             return true;
@@ -200,42 +274,32 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options){
                 }
             }
             var sym = node.scope.find_variable(name);
+            if (node.scope instanceof AST_Lambda && name == "arguments") {
+                node.scope.uses_arguments = true;
+            }
             if (!sym) {
                 sym = self.def_global(node);
-            } else if (sym.scope instanceof AST_Lambda && name == "arguments") {
-                sym.scope.uses_arguments = true;
             }
             node.thedef = sym;
             node.reference(options);
             return true;
         }
-        // ensure mangling works if catch reuses a scope variable
-        var def;
-        if (node instanceof AST_SymbolCatch && (def = node.definition().redefined())) {
-            var s = node.scope;
-            while (s) {
-                push_uniq(s.enclosed, def);
-                if (s === def.scope) break;
-                s = s.parent_scope;
-            }
-        }
     });
     self.walk(tw);
 
     // pass 3: fix up any scoping issue with IE8
-    if (options.ie8) {
+    if (!options.screw_ie8) {
         self.walk(new TreeWalker(function(node, descend) {
             if (node instanceof AST_SymbolCatch) {
                 var name = node.name;
                 var refs = node.thedef.references;
-                var scope = node.thedef.defun;
+                var scope = node.thedef.scope.parent_scope.parent_scope;
                 var def = scope.find_variable(name) || self.globals.get(name) || scope.def_variable(node);
                 refs.forEach(function(ref) {
                     ref.thedef = def;
                     ref.reference(options);
                 });
                 node.thedef = def;
-                node.reference(options);
                 return true;
             }
         }));
@@ -269,10 +333,27 @@ AST_Scope.DEFMETHOD("init_scope_vars", function(parent_scope){
     this.cname = -1;                    // the current index for mangling functions/variables
 });
 
+AST_Node.DEFMETHOD("is_block_scope", function(){
+    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_IterationStatement.DEFMETHOD("is_block_scope", function(){
+     return true;
+});
+
 AST_Lambda.DEFMETHOD("init_scope_vars", function(){
     AST_Scope.prototype.init_scope_vars.apply(this, arguments);
     this.uses_arguments = false;
-    this.def_variable(new AST_SymbolFunarg({
+    this.def_variable(new AST_SymbolVar({
         name: "arguments",
         start: this.start,
         end: this.end
@@ -305,16 +386,24 @@ 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, in_block){
+    this.functions.set(symbol.name, this.def_variable(symbol, in_export, in_block));
 });
 
-AST_Scope.DEFMETHOD("def_variable", function(symbol){
+AST_Scope.DEFMETHOD("def_variable", function(symbol, in_export, in_block){
     var def;
     if (!this.variables.has(symbol.name)) {
         def = new SymbolDef(this, this.variables.size(), symbol);
         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;
+        }
+        if (in_block && symbol instanceof AST_SymbolBlockDeclaration) {
+            def.global = false;
+        } else {
+            def.global = !this.parent_scope;
+        }
     } else {
         def = this.variables.get(symbol.name);
         def.orig.push(symbol);
@@ -329,8 +418,8 @@ AST_Scope.DEFMETHOD("next_mangled", function(options){
         if (!is_identifier(m)) continue; // skip over "do"
 
         // https://github.com/mishoo/UglifyJS2/issues/242 -- do not
-        // shadow a name reserved from mangling.
-        if (options.reserved.indexOf(m) >= 0) continue;
+        // shadow a name excepted from mangling.
+        if (options.except.indexOf(m) >= 0) continue;
 
         // we must ensure that the mangled name does not shadow a name
         // from some parent scope that is referenced in this or in
@@ -363,17 +452,36 @@ AST_Function.DEFMETHOD("next_mangled", function(options, def){
 
 AST_Symbol.DEFMETHOD("unmangleable", function(options){
     var def = this.definition();
-    return !def || def.unmangleable(options);
+    return def && def.unmangleable(options);
+});
+
+// property accessors are not mangleable
+AST_SymbolAccessor.DEFMETHOD("unmangleable", function(){
+    return true;
 });
 
 // labels are always mangleable
-AST_Label.DEFMETHOD("unmangleable", return_false);
+AST_Label.DEFMETHOD("unmangleable", function(){
+    return false;
+});
 
 AST_Symbol.DEFMETHOD("unreferenced", function(){
     return this.definition().references.length == 0
         && !(this.scope.uses_eval || this.scope.uses_with);
 });
 
+AST_Symbol.DEFMETHOD("undeclared", function(){
+    return this.definition().undeclared;
+});
+
+AST_LabelRef.DEFMETHOD("undeclared", function(){
+    return false;
+});
+
+AST_Label.DEFMETHOD("undeclared", function(){
+    return false;
+});
+
 AST_Symbol.DEFMETHOD("definition", function(){
     return this.thedef;
 });
@@ -383,22 +491,22 @@ AST_Symbol.DEFMETHOD("global", function(){
 });
 
 AST_Toplevel.DEFMETHOD("_default_mangler_options", function(options){
-    options = defaults(options, {
+    return defaults(options, {
+        except      : [],
         eval        : false,
-        ie8         : false,
-        keep_fnames : false,
-        reserved    : [],
+        sort        : false, // Ignored. Flag retained for backwards compatibility.
         toplevel    : false,
+        screw_ie8   : true,
+        keep_fnames : false,
+        keep_classnames : false
     });
-    if (!Array.isArray(options.reserved)) options.reserved = [];
-    return options;
 });
 
 AST_Toplevel.DEFMETHOD("mangle_names", function(options){
     options = this._default_mangler_options(options);
 
     // Never mangle arguments
-    options.reserved.push('arguments');
+    options.except.push('arguments');
 
     // We only need to mangle declaration nodes.  Special logic wired
     // into the code generator will display the mangled name if it's
@@ -409,7 +517,7 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options){
 
     if (options.cache) {
         this.globals.each(function(symbol){
-            if (options.reserved.indexOf(symbol.name) < 0) {
+            if (options.except.indexOf(symbol.name) < 0) {
                 to_mangle.push(symbol);
             }
         });
@@ -426,7 +534,7 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options){
         if (node instanceof AST_Scope) {
             var p = tw.parent(), a = [];
             node.variables.each(function(symbol){
-                if (options.reserved.indexOf(symbol.name) < 0) {
+                if (options.except.indexOf(symbol.name) < 0) {
                     a.push(symbol);
                 }
             });
@@ -439,13 +547,19 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options){
             node.mangled_name = name;
             return true;
         }
-        if (!options.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;
@@ -454,69 +568,111 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options){
 
 AST_Toplevel.DEFMETHOD("compute_char_frequency", function(options){
     options = this._default_mangler_options(options);
-    try {
-        AST_Node.prototype.print = function(stream, force_parens) {
-            this._print(stream, force_parens);
-            if (this instanceof AST_Symbol && !this.unmangleable(options)) {
-                base54.consider(this.name, -1);
-            } else if (options.properties) {
-                if (this instanceof AST_Dot) {
-                    base54.consider(this.property, -1);
-                } else if (this instanceof AST_Sub) {
-                    skip_string(this.property);
-                }
-            }
-        };
-        base54.consider(this.print_to_string(), 1);
-    } finally {
-        AST_Node.prototype.print = AST_Node.prototype._print;
-    }
-    base54.sort();
-
-    function skip_string(node) {
-        if (node instanceof AST_String) {
-            base54.consider(node.value, -1);
-        } else if (node instanceof AST_Conditional) {
-            skip_string(node.consequent);
-            skip_string(node.alternative);
-        } else if (node instanceof AST_Sequence) {
-            skip_string(node.expressions[node.expressions.length - 1]);
+    var tw = new TreeWalker(function(node){
+        if (node instanceof AST_Constant)
+            base54.consider(node.print_to_string());
+        else if (node instanceof AST_Return)
+            base54.consider("return");
+        else if (node instanceof AST_Throw)
+            base54.consider("throw");
+        else if (node instanceof AST_Continue)
+            base54.consider("continue");
+        else if (node instanceof AST_Break)
+            base54.consider("break");
+        else if (node instanceof AST_Debugger)
+            base54.consider("debugger");
+        else if (node instanceof AST_Directive)
+            base54.consider(node.value);
+        else if (node instanceof AST_While)
+            base54.consider("while");
+        else if (node instanceof AST_Do)
+            base54.consider("do while");
+        else if (node instanceof AST_If) {
+            base54.consider("if");
+            if (node.alternative) base54.consider("else");
         }
-    }
+        else if (node instanceof AST_Var)
+            base54.consider("var");
+        else if (node instanceof AST_Const)
+            base54.consider("const");
+        else if (node instanceof AST_Lambda)
+            base54.consider("function");
+        else if (node instanceof AST_For)
+            base54.consider("for");
+        else if (node instanceof AST_ForIn)
+            base54.consider("for in");
+        else if (node instanceof AST_Switch)
+            base54.consider("switch");
+        else if (node instanceof AST_Case)
+            base54.consider("case");
+        else if (node instanceof AST_Default)
+            base54.consider("default");
+        else if (node instanceof AST_With)
+            base54.consider("with");
+        else if (node instanceof AST_ObjectSetter)
+            base54.consider("set" + (typeof node.key === "string" ? node.key : ""));
+        else if (node instanceof AST_ObjectGetter)
+            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)
+            base54.consider(node.operator);
+        else if (node instanceof AST_Dot)
+            base54.consider(node.property);
+    });
+    this.walk(tw);
+    base54.sort();
 });
 
 var base54 = (function() {
-    var leading = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_".split("");
-    var digits = "0123456789".split("");
+    var string = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ$_0123456789";
     var chars, frequency;
     function reset() {
         frequency = Object.create(null);
-        leading.forEach(function(ch) {
-            frequency[ch] = 0;
-        });
-        digits.forEach(function(ch) {
-            frequency[ch] = 0;
-        });
+        chars = string.split("").map(function(ch){ return ch.charCodeAt(0) });
+        chars.forEach(function(ch){ frequency[ch] = 0 });
     }
-    base54.consider = function(str, delta) {
+    base54.consider = function(str){
         for (var i = str.length; --i >= 0;) {
-            frequency[str[i]] += delta;
+            var code = str.charCodeAt(i);
+            if (code in frequency) ++frequency[code];
         }
     };
-    function compare(a, b) {
-        return frequency[b] - frequency[a];
-    }
     base54.sort = function() {
-        chars = mergeSort(leading, compare).concat(mergeSort(digits, compare));
+        chars = mergeSort(chars, function(a, b){
+            if (is_digit(a) && !is_digit(b)) return 1;
+            if (is_digit(b) && !is_digit(a)) return -1;
+            return frequency[b] - frequency[a];
+        });
     };
     base54.reset = reset;
     reset();
+    base54.get = function(){ return chars };
+    base54.freq = function(){ return frequency };
     function base54(num) {
         var ret = "", base = 54;
         num++;
         do {
             num--;
-            ret += chars[num % base];
+            ret += String.fromCharCode(chars[num % base]);
             num = Math.floor(num / base);
             base = 64;
         } while (num > 0);
@@ -524,3 +680,89 @@ var base54 = (function() {
     };
     return base54;
 })();
+
+AST_Toplevel.DEFMETHOD("scope_warnings", function(options){
+    options = defaults(options, {
+        undeclared       : false, // this makes a lot of noise
+        unreferenced     : true,
+        assign_to_global : true,
+        func_arguments   : true,
+        nested_defuns    : true,
+        eval             : true
+    });
+    var tw = new TreeWalker(function(node){
+        if (options.undeclared
+            && node instanceof AST_SymbolRef
+            && node.undeclared())
+        {
+            // XXX: this also warns about JS standard names,
+            // i.e. Object, Array, parseInt etc.  Should add a list of
+            // exceptions.
+            AST_Node.warn("Undeclared symbol: {name} [{file}:{line},{col}]", {
+                name: node.name,
+                file: node.start.file,
+                line: node.start.line,
+                col: node.start.col
+            });
+        }
+        if (options.assign_to_global)
+        {
+            var sym = null;
+            if (node instanceof AST_Assign && node.left instanceof AST_SymbolRef)
+                sym = node.left;
+            else if (node instanceof AST_ForIn && node.init instanceof AST_SymbolRef)
+                sym = node.init;
+            if (sym
+                && (sym.undeclared()
+                    || (sym.global() && sym.scope !== sym.definition().scope))) {
+                AST_Node.warn("{msg}: {name} [{file}:{line},{col}]", {
+                    msg: sym.undeclared() ? "Accidental global?" : "Assignment to global",
+                    name: sym.name,
+                    file: sym.start.file,
+                    line: sym.start.line,
+                    col: sym.start.col
+                });
+            }
+        }
+        if (options.eval
+            && node instanceof AST_SymbolRef
+            && node.undeclared()
+            && node.name == "eval") {
+            AST_Node.warn("Eval is used [{file}:{line},{col}]", node.start);
+        }
+        if (options.unreferenced
+            && (node instanceof AST_SymbolDeclaration || node instanceof AST_Label)
+            && !(node instanceof AST_SymbolCatch)
+            && node.unreferenced()) {
+            AST_Node.warn("{type} {name} is declared but not referenced [{file}:{line},{col}]", {
+                type: node instanceof AST_Label ? "Label" : "Symbol",
+                name: node.name,
+                file: node.start.file,
+                line: node.start.line,
+                col: node.start.col
+            });
+        }
+        if (options.func_arguments
+            && node instanceof AST_Lambda
+            && node.uses_arguments) {
+            AST_Node.warn("arguments used in function {name} [{file}:{line},{col}]", {
+                name: node.name ? node.name.name : "anonymous",
+                file: node.start.file,
+                line: node.start.line,
+                col: node.start.col
+            });
+        }
+        if (options.nested_defuns
+            && node instanceof AST_Defun
+            && !(tw.parent() instanceof AST_Scope)) {
+            AST_Node.warn("Function {name} declared in nested statement \"{type}\" [{file}:{line},{col}]", {
+                name: node.name.name,
+                type: tw.parent().TYPE,
+                file: node.start.file,
+                line: node.start.line,
+                col: node.start.col
+            });
+        }
+    });
+    this.walk(tw);
+});

lib/transform.js

@@ -70,7 +70,7 @@ TreeTransformer.prototype = new TreeWalker;
                     if (y !== undefined) x = y;
                 }
             }
-            tw.pop();
+            tw.pop(this);
             return x;
         });
     };
@@ -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){
@@ -174,8 +182,9 @@ TreeTransformer.prototype = new TreeWalker;
         self.args = do_list(self.args, tw);
     });
 
-    _(AST_Sequence, function(self, tw){
-        self.expressions = do_list(self.expressions, tw);
+    _(AST_Seq, function(self, tw){
+        self.car = self.car.transform(tw);
+        self.cdr = self.cdr.transform(tw);
     });
 
     _(AST_Dot, function(self, tw){
@@ -187,6 +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);
     });
@@ -211,7 +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

@@ -43,6 +43,13 @@
 
 "use strict";
 
+function array_to_hash(a) {
+    var ret = Object.create(null);
+    for (var i = 0; i < a.length; ++i)
+        ret[a[i]] = true;
+    return ret;
+};
+
 function slice(a, start) {
     return Array.prototype.slice.call(a, start || 0);
 };
@@ -339,7 +346,7 @@ function first_in_statement(stack) {
     for (var i = 0, p; p = stack.parent(i); i++) {
         if (p instanceof AST_Statement && p.body === node)
             return true;
-        if ((p instanceof AST_Sequence      && p.expressions[0] === node) ||
+        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 ) ||

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": "3.1.2",
+  "version": "2.8.17",
   "engines": {
     "node": ">=0.8.0"
   },
@@ -29,16 +29,26 @@
     "LICENSE"
   ],
   "dependencies": {
-    "commander": "~2.11.0",
-    "source-map": "~0.5.1"
+    "source-map": "~0.5.1",
+    "yargs": "~3.10.0"
   },
   "devDependencies": {
-    "acorn": "~5.1.1",
-    "mocha": "~3.5.1",
-    "semver": "~5.4.1"
+    "acorn": "~0.6.0",
+    "escodegen": "~1.3.3",
+    "esfuzz": "~0.3.1",
+    "estraverse": "~1.5.1",
+    "mocha": "~2.3.4"
+  },
+  "optionalDependencies": {
+    "uglify-to-browserify": "~1.0.0"
+  },
+  "browserify": {
+    "transform": [
+      "uglify-to-browserify"
+    ]
   },
   "scripts": {
     "test": "node test/run-tests.js"
   },
-  "keywords": ["uglify", "uglify-js", "minify", "minifier", "es5"]
+  "keywords": ["uglify", "uglify-js", "minify", "minifier"]
 }

test/benchmark.js

@@ -4,17 +4,15 @@
 "use strict";
 
 var createHash = require("crypto").createHash;
-var fetch = require("./fetch");
 var fork = require("child_process").fork;
-var zlib = require("zlib");
 var args = process.argv.slice(2);
 if (!args.length) {
-    args.push("-mc");
+    args.push("-mc", "warnings=false");
 }
-args.push("--timings");
+args.push("--stats");
 var urls = [
-    "https://code.jquery.com/jquery-3.2.1.js",
-    "https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.4/angular.js",
+    "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",
@@ -32,9 +30,13 @@ function done() {
             console.log();
             console.log(url);
             console.log(info.log);
+            var elapsed = 0;
+            info.log.replace(/: ([0-9]+\.[0-9]{3})s/g, function(match, time) {
+                elapsed += parseFloat(time);
+            });
+            console.log("Run-time:", elapsed.toFixed(3), "s");
             console.log("Original:", info.input, "bytes");
             console.log("Uglified:", info.output, "bytes");
-            console.log("GZipped: ", info.gzip, "bytes");
             console.log("SHA1 sum:", info.sha1);
             if (info.code) {
                 failures.push(url);
@@ -53,21 +55,15 @@ urls.forEach(function(url) {
     results[url] = {
         input: 0,
         output: 0,
-        gzip: 0,
         log: ""
     };
-    fetch(url, function(err, res) {
-        if (err) throw err;
+    require(url.slice(0, url.indexOf(":"))).get(url, function(res) {
         var uglifyjs = fork("bin/uglifyjs", args, { silent: true });
         res.on("data", function(data) {
             results[url].input += data.length;
         }).pipe(uglifyjs.stdin);
         uglifyjs.stdout.on("data", function(data) {
             results[url].output += data.length;
-        }).pipe(zlib.createGzip({
-            level: zlib.Z_BEST_COMPRESSION
-        })).on("data", function(data) {
-            results[url].gzip += data.length;
         }).pipe(createHash("sha1")).on("data", function(data) {
             results[url].sha1 = data.toString("hex");
             done();

test/compress/angular-inject.js

@@ -0,0 +1,67 @@
+ng_inject_defun: {
+    options = {
+        angular: true
+    };
+    input: {
+        /*@ngInject*/
+        function Controller(dependency) {
+            return dependency;
+        }
+    }
+    expect: {
+        function Controller(dependency) {
+            return dependency;
+        }
+        Controller.$inject=['dependency']
+    }
+}
+
+ng_inject_assignment: {
+    options = {
+        angular: true
+    };
+    input: {
+        /*@ngInject*/
+        var Controller = function(dependency) {
+            return dependency;
+        }
+    }
+    expect: {
+        var Controller = function(dependency) {
+            return dependency;
+        }
+        Controller.$inject=['dependency']
+    }
+}
+
+ng_inject_inline: {
+    options = {
+        angular: true
+    };
+    input: {
+        angular.module('a').
+            factory('b',
+                /*@ngInject*/
+                function(dependency) {
+                    return dependency;
+                }).
+            directive('c',
+                /*@ngInject*/
+                function(anotherDependency) {
+                    return anotherDependency;
+                })
+    }
+    expect: {
+        angular.module('a').
+            factory('b',[
+                'dependency',
+                function(dependency) {
+                    return dependency;
+                }]).
+            directive('c',[
+                'anotherDependency',
+                function(anotherDependency) {
+                    return anotherDependency;
+                }])
+    }
+}

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,,];
@@ -91,6 +93,79 @@ constant_join_2: {
     }
 }
 
+spread_with_variable_as_last_element: {
+    input: {
+        var values = [4, 5, 6];
+        var a = [1, 2, 3, ...values];
+    }
+    expect: {
+        var values = [4, 5, 6];
+        var a = [1, 2, 3, ...values];
+    }
+}
+
+spread_with_variable_in_middle: {
+    input: {
+        var values = [4, 5, 6];
+        var a = [1, 2, 3, ...values, 7,,,];
+    }
+    expect: {
+        var values = [4, 5, 6];
+        var a = [1, 2, 3, ...values, 7,,,];
+    }
+}
+
+spread_with_variable_at_front: {
+    input: {
+        var values = [1, 2, 3];
+        var a = [...values, 4, 5, 6];
+    }
+    expect: {
+        var values = [1, 2, 3];
+        var a = [...values, 4, 5, 6];
+    }
+}
+
+spread_with_variable_at_front_after_elisions: {
+    input: {
+        var values = [1, 2, 3];
+        var a = [,,,...values, 4, 5, 6];
+    }
+    expect: {
+        var values = [1, 2, 3];
+        var a = [,,,...values, 4, 5, 6];
+    }
+}
+
+spread_with_array_at_end: {
+    input: {
+        var a = [1, 2, ...[4, 5, 6]];
+    }
+    expect: {
+        var a = [1, 2, ...[4, 5, 6]];
+    }
+}
+
+spread_with_logical_expression_at_end: {
+    options = { evaluate: true }
+    input: {
+        var a = [1, 2, 3, ...[2+2]]
+    }
+    expect: {
+        var a = [1, 2, 3, ...[4]]
+    }
+}
+
+spread_with_logical_expression_at_middle: {
+    options = { evaluate: true }
+    input: {
+        var a = [1, 1, ...[1+1, 1+2, 2+3], 8]
+    }
+    expect: {
+        var a = [1, 1, ...[2, 3, 5], 8]
+    }
+}
+
 constant_join_3: {
     options = {
         unsafe: true,

test/compress/arrow.js

@@ -0,0 +1,137 @@
+arrow_functions_without_body: {
+    input: {
+        var a1 = () => 42;
+        var a2 = (p) => p;
+        var a3 = p => p;
+        var a4 = (...p) => p;
+        var a5 = (b, c) => b + c;
+        var a6 = (b, ...c) => b + c[0];
+        var a7 = (...b) => b.join();
+    }
+    expect: {
+        var a1 = () => 42;
+        var a2 = (p) => p;
+        var a3 = p => p;
+        var a4 = (...p) => p;
+        var a5 = (b, c) => b + c;
+        var a6 = (b, ...c) => b + c[0];
+        var a7 = (...b) => b.join();
+    }
+}
+
+arrow_functions_with_body: {
+    input: {
+        var a1 = () => {
+            var a = 42 * Math.random();
+            return a;
+        };
+        var a2 = (p) => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a3 = p => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a4 = (...p) => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a5 = (b, c) => {
+            var result = b * c + b / c;
+            return result
+        };
+        var a6 = (b, ...c) => {
+            var result = b;
+            for (var i = 0; i < c.length; i++)
+                result += c[i];
+            return result
+        };
+        var a7 = (...b) => {
+            b.join();
+        }
+    }
+    expect: {
+        var a1 = () => {
+            var a = 42 * Math.random();
+            return a;
+        };
+        var a2 = (p) => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a3 = p => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a4 = (...p) => {
+            var a = Math.random() * p;
+            return a;
+        };
+        var a5 = (b, c) => {
+            var result = b * c + b / c;
+            return result
+        };
+        var a6 = (b, ...c) => {
+            var result = b;
+            for (var i = 0; i < c.length; i++)
+                result += c[i];
+            return result
+        };
+        var a7 = (...b) => {
+            b.join();
+        };
+    }
+}
+
+arrow_function_with_single_parameter_with_default: {
+    input: {
+        var foo = (a = 0) => doSomething(a);
+    }
+    expect_exact: "var foo=(a=0)=>doSomething(a);"
+}
+
+arrow_binding_pattern: {
+    input: {
+        var foo = ([]) => "foo";
+        var bar = ({}) => "bar";
+        var with_default = (foo = "default") => foo;
+        var object_with_default = ({foo = "default", bar: baz = "default"}) => foo;
+        var array_after_spread = (...[foo]) => foo;
+        var array_after_spread = (...{foo}) => foo;
+        var computed = ({ [compute()]: x }) => {};
+        var array_hole = ([, , ...x] = [1, 2]) => {};
+        var object_trailing_elision = ({foo,}) => {};
+        var spread_empty_array = (...[]) => "foo";
+        var spread_empty_object = (...{}) => "foo";
+    }
+    expect: {
+        var foo = ([]) => "foo";
+        var bar = ({}) => "bar";
+        var with_default = (foo = "default") => foo;
+        var object_with_default = ({foo = "default", bar: baz = "default"}) => foo;
+        var array_after_spread = (...[foo]) => foo;
+        var array_after_spread = (...{foo}) => foo;
+        var computed = ({ [compute()]: x }) => {};
+        var array_hole = ([, , ...x] = [1, 2]) => {};
+        var object_trailing_elision = ({foo,}) => {};
+        var spread_empty_array = (...[]) => "foo";
+        var spread_empty_object = (...{}) => "foo";
+    }
+}
+
+arrow_binding_pattern_strict: {
+    input: {
+        var foo = ([,]) => "foo";
+    }
+    expect_exact: 'var foo=([,])=>"foo";'
+}
+
+arrow_with_regexp: {
+    input: {
+        num => /\d{11,14}/.test( num )
+    }
+    expect: {
+        num => /\d{11,14}/.test( num )
+    }
+}

test/compress/ascii.js

@@ -2,7 +2,7 @@ ascii_only_true: {
     options = {}
     beautify = {
         ascii_only : true,
-        ie8        : false,
+        screw_ie8  : true,
         beautify   : false,
     }
     input: {
@@ -13,14 +13,14 @@ ascii_only_true: {
                    "\x20\x21\x22\x23 ... \x7d\x7e\x7f\x80\x81 ... \xfe\xff\u0fff\uffff";
         }
     }
-    expect_exact: 'function f(){return"\\x000\\x001\\x007\\x008\\0"+"\\0\\x01\\x02\\x03\\x04\\x05\\x06\\x07\\b\\t\\n\\v\\f\\r\\x0e\\x0f"+"\\x10\\x11\\x12\\x13\\x14\\x15\\x16\\x17\\x18\\x19\\x1a\\x1b\\x1c\\x1d\\x1e\\x1f"+\' !"# ... }~\\x7f\\x80\\x81 ... \\xfe\\xff\\u0fff\\uffff\'}'
+    expect_exact: 'function f(){return"\\x000\\x001\\x007\\08\\0"+"\\0\\x01\\x02\\x03\\x04\\x05\\x06\\x07\\b\\t\\n\\v\\f\\r\\x0e\\x0f"+"\\x10\\x11\\x12\\x13\\x14\\x15\\x16\\x17\\x18\\x19\\x1a\\x1b\\x1c\\x1d\\x1e\\x1f"+\' !"# ... }~\\x7f\\x80\\x81 ... \\xfe\\xff\\u0fff\\uffff\'}'
 }
 
 ascii_only_false: {
     options = {}
     beautify = {
         ascii_only : false,
-        ie8        : false,
+        screw_ie8  : true,
         beautify   : false,
     }
     input: {
@@ -31,5 +31,6 @@ ascii_only_false: {
                    "\x20\x21\x22\x23 ... \x7d\x7e\x7f\x80\x81 ... \xfe\xff\u0fff\uffff";
         }
     }
-    expect_exact: 'function f(){return"\\x000\\x001\\x007\\x008\\0"+"\\0\x01\x02\x03\x04\x05\x06\x07\\b\\t\\n\\v\\f\\r\x0e\x0f"+"\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"+\' !"# ... }~\x7f\x80\x81 ... \xfe\xff\u0fff\uffff\'}'
+    expect_exact: 'function f(){return"\\x000\\x001\\x007\\08\\0"+"\\0\x01\x02\x03\x04\x05\x06\x07\\b\\t\\n\\v\\f\\r\x0e\x0f"+"\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f"+\' !"# ... }~\x7f\x80\x81 ... \xfe\xff\u0fff\uffff\'}'
 }
+

test/compress/asm.js

@@ -104,65 +104,3 @@ asm_mixed: {
     }
 }
 
-asm_toplevel: {
-    options = {}
-    input: {
-        "use asm";
-        0.0;
-        function f() {
-            0.0;
-            (function(){
-                0.0;
-            });
-        }
-        0.0;
-    }
-    expect_exact: '"use asm";0.0;function f(){0.0;(function(){0.0})}0.0;'
-}
-
-asm_function_expression: {
-    options = {}
-    input: {
-        0.0;
-        var a = function() {
-            "use asm";
-            0.0;
-        }
-        function f() {
-            0.0;
-            return function(){
-                "use asm";
-                0.0;
-            }
-            0.0;
-        }
-        0.0;
-    }
-    expect_exact: '0;var a=function(){"use asm";0.0};function f(){0;return function(){"use asm";0.0};0}0;'
-}
-
-asm_nested_functions: {
-    options = {}
-    input: {
-        0.0;
-        function a() {
-            "use asm";
-            0.0;
-        }
-        0.0;
-        function b() {
-            0.0;
-            function c(){
-                "use asm";
-                0.0;
-            }
-            0.0;
-            function d(){
-                0.0;
-            }
-            0.0;
-        }
-        0.0;
-    }
-    expect_exact: '0;function a(){"use asm";0.0}0;function b(){0;function c(){"use asm";0.0}0;function d(){0}0}0;'
-}

test/compress/block-scope.js

@@ -0,0 +1,177 @@
+
+let_statement: {
+    input: {
+        let x = 6;
+    }
+    expect_exact: "let x=6;"
+}
+
+do_not_hoist_let: {
+    options = {
+        hoist_vars: true,
+    };
+    input: {
+        function x() {
+            if (FOO) {
+                let let1;
+                let let2;
+                var var1;
+                var var2;
+            }
+        }
+    }
+    expect: {
+        function x() {
+            var var1, var2;
+            if (FOO) {
+                let let1;
+                let let2;
+            }
+        }
+    }
+}
+
+do_not_remove_anon_blocks_if_they_have_decls: {
+    input: {
+        function x() {
+            {
+                let x;
+            }
+            {
+                var x;
+            }
+            {
+                const y;
+                class Zee {};
+            }
+        }
+        {
+            let y;
+        }
+        {
+            var y;
+        }
+    }
+    expect: {
+        function x(){
+            {
+                let x
+            }
+            var x;
+            {
+                const y;
+                class Zee {}
+            }
+        }
+        {
+            let y
+        }
+        var y;
+    }
+}
+
+remove_unused_in_global_block: {
+    options = {
+        unused: true,
+    }
+    input: {
+        {
+            let x;
+            const y;
+            class Zee {};
+            var w;
+        }
+        let ex;
+        const why;
+        class Zed {};
+        var wut;
+        console.log(x, y, Zee);
+    }
+    expect: {
+        var w;
+        let ex;
+        const why;
+        class Zed {};
+        var wut;
+        console.log(x, y, Zee);
+    }
+}
+
+regression_block_scope_resolves: {
+    mangle = { };
+    options = {
+        dead_code: false
+    };
+    input: {
+        (function () {
+            if(1) {
+                let x;
+                const y;
+                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/concat-strings.js

@@ -21,7 +21,7 @@ concat_1: {
         var c = 1 + x() + 2 + "boo";
         var d = 1 + x() + 2 + 3 + "boo";
         var e = 1 + x() + 2 + "X3boo";
-        var f = "\x00360\x008\0";
+        var f = "\x00360\08\0";
     }
 }
 

test/compress/conditionals.js

@@ -962,56 +962,3 @@ condition_symbol_matches_consequent: {
     }
     expect_stdout: "3 7 true 4"
 }
-
-delete_conditional_1: {
-    options = {
-        booleans: true,
-        conditionals: true,
-        evaluate: true,
-        side_effects: true,
-    }
-    input: {
-        console.log(delete (1 ? undefined : x));
-        console.log(delete (1 ? void 0 : x));
-        console.log(delete (1 ? Infinity : x));
-        console.log(delete (1 ? 1 / 0 : x));
-        console.log(delete (1 ? NaN : x));
-        console.log(delete (1 ? 0 / 0 : x));
-    }
-    expect: {
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-    }
-    expect_stdout: true
-}
-
-delete_conditional_2: {
-    options = {
-        booleans: true,
-        conditionals: true,
-        evaluate: true,
-        keep_infinity: true,
-        side_effects: true,
-    }
-    input: {
-        console.log(delete (0 ? x : undefined));
-        console.log(delete (0 ? x : void 0));
-        console.log(delete (0 ? x : Infinity));
-        console.log(delete (0 ? x : 1 / 0));
-        console.log(delete (0 ? x : NaN));
-        console.log(delete (0 ? x : 0 / 0));
-    }
-    expect: {
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-    }
-    expect_stdout: true
-}

test/compress/const.js

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

test/compress/dead-code.js

@@ -31,7 +31,7 @@ dead_code_2_should_warn: {
         function f() {
             g();
             x = 10;
-            throw new Error("foo");
+            throw "foo";
             // completely discarding the `if` would introduce some
             // bugs.  UglifyJS v1 doesn't deal with this issue; in v2
             // we copy any declarations to the upper scope.
@@ -46,60 +46,16 @@ dead_code_2_should_warn: {
                 })();
             }
         }
-        f();
     }
     expect: {
         function f() {
             g();
             x = 10;
-            throw new Error("foo");
+            throw "foo";
             var x;
             function g(){};
         }
-        f();
     }
-    expect_stdout: true
-    node_version: "<=4"
-}
-
-dead_code_2_should_warn_strict: {
-    options = {
-        dead_code: true
-    };
-    input: {
-        "use strict";
-        function f() {
-            g();
-            x = 10;
-            throw new Error("foo");
-            // completely discarding the `if` would introduce some
-            // bugs.  UglifyJS v1 doesn't deal with this issue; in v2
-            // we copy any declarations to the upper scope.
-            if (x) {
-                y();
-                var x;
-                function g(){};
-                // but nested declarations should not be kept.
-                (function(){
-                    var q;
-                    function y(){};
-                })();
-            }
-        }
-        f();
-    }
-    expect: {
-        "use strict";
-        function f() {
-            g();
-            x = 10;
-            throw new Error("foo");
-            var x;
-        }
-        f();
-    }
-    expect_stdout: true
-    node_version: ">=4"
 }
 
 dead_code_constant_boolean_should_warn_more: {
@@ -122,7 +78,6 @@ dead_code_constant_boolean_should_warn_more: {
             foo();
             var moo;
         }
-        bar();
     }
     expect: {
         var foo;
@@ -131,285 +86,153 @@ dead_code_constant_boolean_should_warn_more: {
         // as for the for, it should keep:
         var x = 10, y;
         var moo;
-        bar();
     }
     expect_stdout: true
-    node_version: "<=4"
 }
 
-dead_code_constant_boolean_should_warn_more_strict: {
+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,
-        side_effects : true,
+        reduce_vars  : true,
     };
     input: {
-        "use strict";
-        while (!((foo && bar) || (x + "0"))) {
+        var unused;
+        const CONST_FOO = false;
+        if (CONST_FOO) {
             console.log("unreachable");
-            var foo;
+            var moo;
             function bar() {}
         }
-        for (var x = 10, y; x && (y || x) && (!typeof x); ++x) {
-            asdf();
-            foo();
-            var moo;
-        }
-        bar();
     }
     expect: {
-        "use strict";
-        var foo;
-        // nothing for the while
-        // as for the for, it should keep:
-        var x = 10, y;
+        var unused;
+        const CONST_FOO = !1;
         var moo;
-        bar();
+        function bar() {}
     }
     expect_stdout: true
-    node_version: ">=4"
 }
 
-try_catch_finally: {
+dead_code_const_annotation: {
     options = {
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-    }
+        dead_code    : true,
+        loops        : true,
+        booleans     : true,
+        conditionals : true,
+        evaluate     : true,
+        reduce_vars  : true,
+        toplevel     : true,
+    };
     input: {
-        var a = 1;
-        !function() {
-            try {
-                if (false) throw x;
-            } catch (a) {
-                var a = 2;
-                console.log("FAIL");
-            } finally {
-                a = 3;
-                console.log("PASS");
+        var unused;
+        /** @const */ var CONST_FOO_ANN = false;
+        if (CONST_FOO_ANN) {
+            console.log("unreachable");
+            var moo;
+            function bar() {}
+        }
+    }
+    expect: {
+        var unused;
+        var CONST_FOO_ANN = !1;
+        var moo;
+        function bar() {}
+    }
+    expect_stdout: true
+}
+
+dead_code_const_annotation_regex: {
+    options = {
+        dead_code    : true,
+        loops        : true,
+        booleans     : true,
+        conditionals : true,
+        evaluate     : true
+    };
+    input: {
+        var unused;
+        // @constraint this shouldn't be a constant
+        var CONST_FOO_ANN = false;
+        if (CONST_FOO_ANN) {
+            console.log("reachable");
+        }
+    }
+    expect: {
+        var unused;
+        var CONST_FOO_ANN = !1;
+        CONST_FOO_ANN && console.log('reachable');
+    }
+    expect_stdout: true
+}
+
+dead_code_const_annotation_complex_scope: {
+    options = {
+        dead_code    : true,
+        loops        : true,
+        booleans     : true,
+        conditionals : true,
+        evaluate     : true,
+        reduce_vars  : true,
+        toplevel     : true,
+    };
+    input: {
+        var unused_var;
+        /** @const */ var test = 'test';
+        // @const
+        var CONST_FOO_ANN = false;
+        var unused_var_2;
+        if (CONST_FOO_ANN) {
+            console.log("unreachable");
+            var moo;
+            function bar() {}
+        }
+        if (test === 'test') {
+            var beef = 'good';
+            /** @const */ var meat = 'beef';
+            var pork = 'bad';
+            if (meat === 'pork') {
+                console.log('also unreachable');
+            } else if (pork === 'good') {
+                console.log('reached, not const');
             }
-        }();
-        try {
-            console.log(a);
-        } finally {
         }
     }
     expect: {
-        var a = 1;
-        !function() {
-            var a;
-            a = 3;
-            console.log("PASS");
-        }();
-        try {
-            console.log(a);
-        } finally {
-        }
+        var unused_var;
+        var test = 'test';
+        var CONST_FOO_ANN = !1;
+        var unused_var_2;
+        var moo;
+        function bar() {}
+        var beef = 'good';
+        var meat = 'beef';
+        var pork = 'bad';
     }
-    expect_stdout: [
-        "PASS",
-        "1",
-    ]
-}
-
-accessor: {
-    options = {
-        side_effects: true,
-    }
-    input: {
-        ({
-            get a() {},
-            set a(v){
-                this.b = 2;
-            },
-            b: 1
-        });
-    }
-    expect: {}
-}
-
-issue_2233_1: {
-    options = {
-        pure_getters: "strict",
-        side_effects: true,
-        unsafe: true,
-    }
-    input: {
-        Array.isArray;
-        Boolean;
-        console.log;
-        Date;
-        decodeURI;
-        decodeURIComponent;
-        encodeURI;
-        encodeURIComponent;
-        Error.name;
-        escape;
-        eval;
-        EvalError;
-        Function.length;
-        isFinite;
-        isNaN;
-        JSON;
-        Math.random;
-        Number.isNaN;
-        parseFloat;
-        parseInt;
-        RegExp;
-        Object.defineProperty;
-        String.fromCharCode;
-        RangeError;
-        ReferenceError;
-        SyntaxError;
-        TypeError;
-        unescape;
-        URIError;
-    }
-    expect: {}
     expect_stdout: true
 }
-
-global_timeout_and_interval_symbols: {
-    options = {
-        pure_getters: "strict",
-        side_effects: true,
-        unsafe: true,
-    }
-    input: {
-        // These global symbols do not exist in the test sandbox
-        // and must be tested separately.
-        clearInterval;
-        clearTimeout;
-        setInterval;
-        setTimeout;
-    }
-    expect: {}
-}
-
-issue_2233_2: {
-    options = {
-        pure_getters: "strict",
-        reduce_vars: true,
-        side_effects: true,
-        unsafe: true,
-        unused: true,
-    }
-    input: {
-        var RegExp;
-        Array.isArray;
-        RegExp;
-        UndeclaredGlobal;
-        function foo() {
-            var Number;
-            AnotherUndeclaredGlobal;
-            Math.sin;
-            Number.isNaN;
-        }
-    }
-    expect: {
-        var RegExp;
-        UndeclaredGlobal;
-        function foo() {
-            var Number;
-            AnotherUndeclaredGlobal;
-            Number.isNaN;
-        }
-    }
-}
-
-issue_2233_3: {
-    options = {
-        pure_getters: "strict",
-        reduce_vars: true,
-        side_effects: true,
-        toplevel: true,
-        unsafe: true,
-        unused: true,
-    }
-    input: {
-        var RegExp;
-        Array.isArray;
-        RegExp;
-        UndeclaredGlobal;
-        function foo() {
-            var Number;
-            AnotherUndeclaredGlobal;
-            Math.sin;
-            Number.isNaN;
-        }
-    }
-    expect: {
-        UndeclaredGlobal;
-    }
-}
-
-global_fns: {
-    options = {
-        side_effects: true,
-        unsafe: true,
-    }
-    input: {
-        Boolean(1, 2);
-        decodeURI(1, 2);
-        decodeURIComponent(1, 2);
-        Date(1, 2);
-        encodeURI(1, 2);
-        encodeURIComponent(1, 2);
-        Error(1, 2);
-        escape(1, 2);
-        EvalError(1, 2);
-        isFinite(1, 2);
-        isNaN(1, 2);
-        Number(1, 2);
-        Object(1, 2);
-        parseFloat(1, 2);
-        parseInt(1, 2);
-        RangeError(1, 2);
-        ReferenceError(1, 2);
-        String(1, 2);
-        SyntaxError(1, 2);
-        TypeError(1, 2);
-        unescape(1, 2);
-        URIError(1, 2);
-        try {
-            Function(1, 2);
-        } catch (e) {
-            console.log(e.name);
-        }
-        try {
-            RegExp(1, 2);
-        } catch (e) {
-            console.log(e.name);
-        }
-        try {
-            Array(NaN);
-        } catch (e) {
-            console.log(e.name);
-        }
-    }
-    expect: {
-        try {
-            Function(1, 2);
-        } catch (e) {
-            console.log(e.name);
-        }
-        try {
-            RegExp(1, 2);
-        } catch (e) {
-            console.log(e.name);
-        }
-        try {
-            Array(NaN);
-        } catch (e) {
-            console.log(e.name);
-        }
-    }
-    expect_stdout: [
-        "SyntaxError",
-        "SyntaxError",
-        "RangeError",
-    ]
-}

test/compress/destructuring.js

@@ -0,0 +1,309 @@
+destructuring_arrays: {
+    input: {
+        {const [aa, bb] = cc;}
+        {const [aa, [bb, cc]] = dd;}
+        {let [aa, bb] = cc;}
+        {let [aa, [bb, cc]] = dd;}
+        var [aa, bb] = cc;
+        var [aa, [bb, cc]] = dd;
+        var [,[,,,,,],,,zz,] = xx; // Trailing comma
+        var [,,zzz,,] = xxx; // Trailing comma after hole
+    }
+    expect: {
+        {const [aa, bb] = cc;}
+        {const [aa, [bb, cc]] = dd;}
+        {let [aa, bb] = cc;}
+        {let [aa, [bb, cc]] = dd;}
+        var [aa, bb] = cc;
+        var [aa, [bb, cc]] = dd;
+        var [,[,,,,,],,,zz] = xx;
+        var [,,zzz,,] = xxx;
+    }
+}
+
+destructuring_arrays_holes: {
+    input: {
+        var [,,,,] = a;
+        var [,,b,] = c;
+        var [d,,]  = e;
+    }
+    expect_exact: "var[,,,,]=a;var[,,b]=c;var[d,,]=e;"
+}
+
+destructuring_objects: {
+    input: {
+        {const {aa, bb} = {aa:1, bb:2};}
+        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        {let {aa, bb} = {aa:1, bb:2};}
+        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        var {aa, bb} = {aa:1, bb:2};
+        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
+    }
+    expect: {
+        {const {aa, bb} = {aa:1, bb:2};}
+        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        {let {aa, bb} = {aa:1, bb:2};}
+        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        var {aa, bb} = {aa:1, bb:2};
+        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
+    }
+}
+
+destructuring_objects_trailing_elision: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        var {cc,} = foo;
+    }
+    expect_exact: "var{cc}=foo;"
+}
+
+nested_destructuring_objects: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        const [{a},b] = c;
+        let [{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: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        for (const [x,y] in pairs);
+        for (const [a] = 0;;);
+        for (const {c} of cees);
+    }
+    expect_exact: "for(const[x,y]in pairs);for(const[a]=0;;);for(const{c}of cees);"
+}
+
+destructuring_letdef_in_loops: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        for (let [x,y] in pairs);
+        for (let [a] = 0;;);
+        for (let {c} of cees);
+    }
+    expect_exact: "for(let[x,y]in pairs);for(let[a]=0;;);for(let{c}of cees);"
+}
+
+destructuring_vardef_in_loops: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        for (var [x,y] in pairs);
+        for (var [a] = 0;;);
+        for (var {c} of cees);
+    }
+    expect_exact: "for(var[x,y]in pairs);for(var[a]=0;;);for(var{c}of cees);"
+}
+
+destructuring_expressions: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        ({a, b});
+        [{a}];
+        f({x});
+    }
+    expect_exact: "({a,b});[{a}];f({x});"
+}
+
+destructuring_remove_unused_1: {
+    options = {
+        unused: true
+    }
+    input: {
+        function a() {
+            var unused = "foo";
+            var a = [1];
+            var [b] = a;
+            f(b);
+        }
+        function b() {
+            var unused = "foo";
+            var a = {b: 1};
+            var {b} = a;
+            f(b);
+        }
+        function c() {
+            var unused = "foo";
+            var a = [[1]];
+            var [[b]] = a;
+            f(b);
+        }
+        function d() {
+            var unused = "foo";
+            var a = {b: {b:1}};
+            var {b:{b}} = a;
+            f(b);
+        }
+        function e() {
+            var unused = "foo";
+            var a = [1, 2, 3, 4, 5];
+            var [b, ...c] = a;
+            f(b, c);
+        }
+    }
+    expect: {
+        function a() {
+            var a = [1];
+            var [b] = a;
+            f(b);
+        }
+        function b() {
+            var a = {b: 1};
+            var {b} = a;
+            f(b);
+        }
+        function c() {
+            var a = [[1]];
+            var [[b]] = a;
+            f(b);
+        }
+        function d() {
+            var a = {b: {b:1}};
+            var {b:{b}} = a;
+            f(b);
+        }
+        function e() {
+            var a = [1, 2, 3, 4, 5];
+            var [b, ...c] = a;
+            f(b, c);
+        }
+    }
+}
+
+destructuring_remove_unused_2: {
+    options = {
+        unused: true
+    }
+    input: {
+        function a() {
+            var unused = "foo";
+            var a = [,,1];
+            var [b] = a;
+            f(b);
+        }
+        function b() {
+            var unused = "foo";
+            var a = [{a: [1]}];
+            var [{b: a}] = a;
+            f(b);
+        }
+    }
+    expect: {
+        function a() {
+            var a = [,,1];
+            var [b] = a;
+            f(b);
+        }
+        function b() {
+            var a = [{a: [1]}];
+            var [{b: a}] = a;
+            f(b);
+        }
+    }
+}
+
+object_destructuring_may_need_parentheses: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        ({a, b} = {a: 1, b: 2});
+    }
+    expect_exact: "({a,b}={a:1,b:2});"
+}
+
+destructuring_with_undefined_as_default_assignment: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        [foo = undefined] = bar;
+        [foo = void 0] = bar;
+    }
+    expect: {
+        [foo] = bar;
+        [foo] = bar;
+    }
+}
+
+destructuring_dont_evaluate_with_undefined_as_default_assignment: {
+    options = {
+        evaluate: false
+    }
+    input: {
+        [foo = undefined] = bar;
+    }
+    expect: {
+        [foo = void 0] = bar;
+    }
+}
+
+reduce_vars: {
+    options = {
+        reduce_vars: true,
+    }
+    input: {
+        {const [aa, [bb, cc]] = dd;}
+        {let [aa, [bb, cc]] = dd;}
+        var [aa, [bb, cc]] = dd;
+        [aa, [bb, cc]] = dd;
+        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
+        ({aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}});
+        const [{a},b] = c;
+        let [{a},b] = c;
+        var [{a},b] = c;
+        [{a},b] = c;
+        for (const [x,y] in pairs);
+        for (let [x,y] in pairs);
+        for (var [x,y] in pairs);
+        for ([x,y] in pairs);
+    }
+    expect: {
+        {const [aa, [bb, cc]] = dd;}
+        {let [aa, [bb, cc]] = dd;}
+        var [aa, [bb, cc]] = dd;
+        [aa, [bb, cc]] = dd;
+        {const {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        {let {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};}
+        var {aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}};
+        ({aa, bb: {cc, dd}} = {aa:1, bb: {cc:2, dd: 3}});
+        const [{a},b] = c;
+        let [{a},b] = c;
+        var [{a},b] = c;
+        [{a},b] = c;
+        for (const [x,y] in pairs);
+        for (let [x,y] in pairs);
+        for (var [x,y] in pairs);
+        for ([x,y] in pairs);
+    }
+}
+
+unused: {
+    options = {
+        unused: true,
+    }
+    input: {
+        let { foo: [, , ...a] } = { foo: [1, 2, 3, 4], bar: 5 };
+        console.log(a);
+    }
+    expect: {
+        let { foo: [, , ...a] } = { foo: [1, 2, 3, 4], bar: 5 };
+        console.log(a);
+    }
+}

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-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: {
@@ -649,6 +730,37 @@ drop_value: {
     }
 }
 
+const_assign: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        function f() {
+            const b = 2;
+            return 1 + b;
+        }
+
+        function g() {
+            const b = 2;
+            b = 3;
+            return 1 + b;
+        }
+    }
+    expect: {
+        function f() {
+            return 3;
+        }
+
+        function g() {
+            const b = 2;
+            b = 3;
+            return 1 + b;
+        }
+    }
+}
+
 issue_1539: {
     options = {
         cascade: true,
@@ -751,12 +863,12 @@ issue_1583: {
     expect: {
         function m(t) {
             (function(e) {
-                t = e();
-            })(function() {
-                return (function(a) {
-                    return a;
-                })(function(a) {});
-            });
+                t = (function() {
+                    return (function(a) {
+                        return a;
+                    })(function(a) {});
+                })();
+            })();
         }
     }
 }
@@ -785,6 +897,10 @@ issue_1709: {
                 var x = 1;
                 return x;
             }(),
+            function y() {
+                const y = 2;
+                return y;
+            }(),
             function z() {
                 function z() {}
                 return z;
@@ -797,6 +913,10 @@ issue_1709: {
                 var x = 1;
                 return x;
             }(),
+            function() {
+                const y = 2;
+                return y;
+            }(),
             function() {
                 function z() {}
                 return z;
@@ -814,9 +934,7 @@ issue_1715_1: {
         var a = 1;
         function f() {
             a++;
-            try {
-                x();
-            } catch (a) {
+            try {} catch (a) {
                 var a;
             }
         }
@@ -827,9 +945,7 @@ issue_1715_1: {
         var a = 1;
         function f() {
             a++;
-            try {
-                x();
-            } catch (a) {
+            try {} catch (a) {
                 var a;
             }
         }
@@ -847,9 +963,7 @@ issue_1715_2: {
         var a = 1;
         function f() {
             a++;
-            try {
-                x();
-            } catch (a) {
+            try {} catch (a) {
                 var a = 2;
             }
         }
@@ -860,9 +974,7 @@ issue_1715_2: {
         var a = 1;
         function f() {
             a++;
-            try {
-                x();
-            } catch (a) {
+            try {} catch (a) {
                 var a;
             }
         }
@@ -880,9 +992,7 @@ issue_1715_3: {
         var a = 1;
         function f() {
             a++;
-            try {
-                console;
-            } catch (a) {
+            try {} catch (a) {
                 var a = 2 + x();
             }
         }
@@ -893,11 +1003,8 @@ issue_1715_3: {
         var a = 1;
         function f() {
             a++;
-            try {
-                console;
-            } catch (a) {
-                var a;
-                x();
+            try {} catch (a) {
+                var a = x();
             }
         }
         f();
@@ -905,359 +1012,3 @@ issue_1715_3: {
     }
     expect_stdout: "1"
 }
-
-issue_1715_4: {
-    options = {
-        unused: true,
-    }
-    input: {
-        var a = 1;
-        !function a() {
-            a++;
-            try {
-                x();
-            } catch (a) {
-                var a;
-            }
-        }();
-        console.log(a);
-    }
-    expect: {
-        var a = 1;
-        !function() {
-            a++;
-            try {
-                x();
-            } catch (a) {
-                var a;
-            }
-        }();
-        console.log(a);
-    }
-    expect_stdout: "1"
-}
-
-delete_assign_1: {
-    options = {
-        booleans: true,
-        side_effects: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var a;
-        console.log(delete (a = undefined));
-        console.log(delete (a = void 0));
-        console.log(delete (a = Infinity));
-        console.log(delete (a = 1 / 0));
-        console.log(delete (a = NaN));
-        console.log(delete (a = 0 / 0));
-    }
-    expect: {
-        console.log((void 0, !0));
-        console.log((void 0, !0));
-        console.log((1 / 0, !0));
-        console.log((1 / 0, !0));
-        console.log((NaN, !0));
-        console.log((0 / 0, !0));
-    }
-    expect_stdout: true
-}
-
-delete_assign_2: {
-    options = {
-        booleans: true,
-        keep_infinity: true,
-        side_effects: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var a;
-        console.log(delete (a = undefined));
-        console.log(delete (a = void 0));
-        console.log(delete (a = Infinity));
-        console.log(delete (a = 1 / 0));
-        console.log(delete (a = NaN));
-        console.log(delete (a = 0 / 0));
-    }
-    expect: {
-        console.log((void 0, !0));
-        console.log((void 0, !0));
-        console.log((Infinity, !0));
-        console.log((1 / 0, !0));
-        console.log((NaN, !0));
-        console.log((0 / 0, !0));
-    }
-    expect_stdout: true
-}
-
-drop_var: {
-    options = {
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var a;
-        console.log(a, b);
-        var a = 1, b = 2;
-        console.log(a, b);
-        var a = 3;
-        console.log(a, b);
-    }
-    expect: {
-        console.log(a, b);
-        var a = 1, b = 2;
-        console.log(a, b);
-        a = 3;
-        console.log(a, b);
-    }
-    expect_stdout: [
-        "undefined undefined",
-        "1 2",
-        "3 2",
-    ]
-}
-
-issue_1830_1: {
-    options = {
-        unused: true,
-    }
-    input: {
-        !function() {
-            L: for (var b = console.log(1); !1;) continue L;
-        }();
-    }
-    expect: {
-        !function() {
-            L: for (console.log(1); !1;) continue L;
-        }();
-    }
-    expect_stdout: "1"
-}
-
-issue_1830_2: {
-    options = {
-        unused: true,
-    }
-    input: {
-        !function() {
-            L: for (var a = 1, b = console.log(a); --a;) continue L;
-        }();
-    }
-    expect: {
-        !function() {
-            var a = 1;
-            L: for (console.log(a); --a;) continue L;
-        }();
-    }
-    expect_stdout: "1"
-}
-
-issue_1838: {
-    options = {
-        join_vars: true,
-        loops: true,
-        unused: true,
-    }
-    beautify = {
-        beautify: true,
-    }
-    input: {
-        function f() {
-            var b = a;
-            while (c);
-        }
-    }
-    expect_exact: [
-        "function f() {",
-        "    for (a; c; ) ;",
-        "}",
-    ]
-}
-
-var_catch_toplevel: {
-    options = {
-        conditionals: true,
-        negate_iife: true,
-        reduce_vars: true,
-        side_effects: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        function f() {
-            a--;
-            try {
-                a++;
-                x();
-            } catch(a) {
-                if (a) var a;
-                var a = 10;
-            }
-        }
-        f();
-    }
-    expect: {
-        !function() {
-            try {
-                x();
-            } catch(a) {
-                var a;
-            }
-        }();
-    }
-}
-
-issue_2105: {
-    options = {
-        collapse_vars: true,
-        inline: true,
-        passes: 3,
-        reduce_vars: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        !function(factory) {
-            factory();
-        }( function() {
-            return function(fn) {
-                fn()().prop();
-            }( function() {
-                function bar() {
-                    var quux = function() {
-                        console.log("PASS");
-                    }, foo = function() {
-                        console.log;
-                        quux();
-                    };
-                    return { prop: foo };
-                }
-                return bar;
-            } );
-        });
-    }
-    expect: {
-        (function() {
-            var quux = function() {
-                console.log("PASS");
-            };
-            return {
-                prop: function() {
-                    console.log;
-                    quux();
-                }
-            };
-        })().prop();
-    }
-    expect_stdout: "PASS"
-}
-
-issue_2226_1: {
-    options = {
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        function f1() {
-            var a = b;
-            a += c;
-        }
-        function f2(a) {
-            a <<= b;
-        }
-        function f3(a) {
-            --a;
-        }
-        function f4() {
-            var a = b;
-            return a *= c;
-        }
-        function f5(a) {
-            x(a /= b);
-        }
-    }
-    expect: {
-        function f1() {
-            b;
-            c;
-        }
-        function f2(a) {
-            b;
-        }
-        function f3(a) {
-            0;
-        }
-        function f4() {
-            var a = b;
-            return a *= c;
-        }
-        function f5(a) {
-            x(a /= b);
-        }
-    }
-}
-
-issue_2226_2: {
-    options = {
-        cascade: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        console.log(function(a, b) {
-            a += b;
-            return a;
-        }(1, 2));
-    }
-    expect: {
-        console.log(function(a, b) {
-            return a += b;
-        }(1, 2));
-    }
-    expect_stdout: "3"
-}
-
-issue_2226_3: {
-    options = {
-        collapse_vars: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        console.log(function(a, b) {
-            a += b;
-            return a;
-        }(1, 2));
-    }
-    expect: {
-        console.log(function(a, b) {
-            return a += 2;
-        }(1));
-    }
-    expect_stdout: "3"
-}
-
-issue_2288: {
-    options = {
-        unused: true,
-    }
-    beautify = {
-        beautify: true,
-    }
-    input: {
-        function foo(o) {
-            for (var j = o.a, i = 0; i < 0; i++);
-            for (var i = 0; i < 0; i++);
-        }
-    }
-    expect: {
-        function foo(o) {
-            o.a;
-            for (i = 0; i < 0; i++);
-            for (var i = 0; i < 0; i++);
-        }
-    }
-}

test/compress/evaluate.js

@@ -196,8 +196,8 @@ negative_zero: {
         console.log(
             -0,
             0,
-            -1/0,
-            -1/0
+            1 / (-0),
+            1 / (-0)
         );
     }
     expect_stdout: true
@@ -217,13 +217,107 @@ positive_zero: {
         console.log(
             0,
             -0,
-            1/0,
-            1/0
+            1 / (0),
+            1 / (0)
         );
     }
     expect_stdout: true
 }
 
+pow: {
+    options = { evaluate: true }
+    input: {
+        var a = 5 ** 3;
+    }
+    expect: {
+        var a = 125;
+    }
+}
+
+pow_sequence: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        var a = 2 ** 3 ** 2;
+    }
+    expect: {
+        var a = 512;
+    }
+}
+
+pow_mixed: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        var a = 5 + 2 ** 3 + 5;
+        var b = 5 * 3 ** 2;
+        var c = 5 ** 3 * 2;
+        var d = 5 ** +3;
+    }
+    expect: {
+        var a = 18;
+        var b = 45;
+        var c = 250;
+        var d = 125;
+    }
+}
+
+pow_with_right_side_evaluating_to_unary: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        var a = (4 - 7) ** foo;
+        var b = ++bar ** 3;
+        var c = --baz ** 2;
+    }
+    expect_exact: "var a=(-3)**foo;var b=++bar**3;var c=--baz**2;"
+}
+
+pow_with_number_constants: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        var a = 5 ** NaN;
+        /* NaN exponent results to NaN */
+        var b = 42 ** +0;
+        /* +0 exponent results to NaN */
+        var c = 42 ** -0;
+        /* -0 exponent results to NaN */
+        var d = NaN ** 1;
+        /* NaN with non-zero exponent is NaN */
+        var e = 2 ** Infinity;
+        /* abs(base) > 1 with Infinity as exponent is Infinity */
+        var f = 2 ** -Infinity;
+        /* abs(base) > 1 with -Infinity as exponent is +0 */
+        var g = (-7) ** (0.5);
+        var h = 2324334 ** 34343443;
+        var i = (-2324334) ** 34343443;
+        var j = 2 ** (-3);
+        var k = 2.0 ** -3;
+        var l = 2.0 ** (5 - 7);
+        var m = 3 ** -10;  // Result will be 0.000016935087808430286, which is too long
+    }
+    expect: {
+        var a = NaN;
+        var b = 1;
+        var c = 1;
+        var d = NaN;
+        var e = 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;
+    }
+}
+
 unsafe_constant: {
     options = {
         evaluate  : true,
@@ -250,26 +344,22 @@ unsafe_constant: {
 
 unsafe_object: {
     options = {
-        evaluate: true,
-        reduce_vars: true,
-        toplevel: true,
-        unsafe: true,
+        evaluate  : true,
+        unsafe    : true
     }
     input: {
-        var o = { a: 1 };
         console.log(
-            o + 1,
-            o.a + 1,
-            o.b + 1,
-            o.a.b + 1
+            ({a:1}) + 1,
+            ({a:1}).a + 1,
+            ({a:1}).b + 1,
+            ({a:1}).a.b + 1
         );
     }
     expect: {
-        var o = { a: 1 };
         console.log(
-            o + 1,
+            ({a:1}) + 1,
             2,
-            o.b + 1,
+            ({a:1}).b + 1,
             1..b + 1
         );
     }
@@ -278,26 +368,22 @@ unsafe_object: {
 
 unsafe_object_nested: {
     options = {
-        evaluate: true,
-        reduce_vars: true,
-        toplevel: true,
-        unsafe: true,
+        evaluate  : true,
+        unsafe    : true
     }
     input: {
-        var o = { a: { b: 1 } };
         console.log(
-            o + 1,
-            o.a + 1,
-            o.b + 1,
-            o.a.b + 1
+            ({a:{b:1}}) + 1,
+            ({a:{b:1}}).a + 1,
+            ({a:{b:1}}).b + 1,
+            ({a:{b:1}}).a.b + 1
         );
     }
     expect: {
-        var o = { a: { b: 1 } };
         console.log(
-            o + 1,
-            o.a + 1,
-            o.b + 1,
+            ({a:{b:1}}) + 1,
+            ({a:{b:1}}).a + 1,
+            ({a:{b:1}}).b + 1,
             2
         );
     }
@@ -306,25 +392,21 @@ unsafe_object_nested: {
 
 unsafe_object_complex: {
     options = {
-        evaluate: true,
-        reduce_vars: true,
-        toplevel: true,
-        unsafe: true,
+        evaluate  : true,
+        unsafe    : true
     }
     input: {
-        var o = { a: { b: 1 }, b: 1 };
         console.log(
-            o + 1,
-            o.a + 1,
-            o.b + 1,
-            o.a.b + 1
+            ({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: {
-        var o = { a: { b: 1 }, b: 1 };
         console.log(
-            o + 1,
-            o.a + 1,
+            ({a:{b:1},b:1}) + 1,
+            ({a:{b:1},b:1}).a + 1,
             2,
             2
         );
@@ -334,26 +416,22 @@ unsafe_object_complex: {
 
 unsafe_object_repeated: {
     options = {
-        evaluate: true,
-        reduce_vars: true,
-        toplevel: true,
-        unsafe: true,
+        evaluate  : true,
+        unsafe    : true
     }
     input: {
-        var o = { a: { b: 1 }, a: 1 };
         console.log(
-            o + 1,
-            o.a + 1,
-            o.b + 1,
-            o.a.b + 1
+            ({a:{b:1},a:1}) + 1,
+            ({a:{b:1},a:1}).a + 1,
+            ({a:{b:1},a:1}).b + 1,
+            ({a:{b:1},a:1}).a.b + 1
         );
     }
     expect: {
-        var o = { a: { b: 1 }, a: 1 };
         console.log(
-            o + 1,
+            ({a:{b:1},a:1}) + 1,
             2,
-            o.b + 1,
+            ({a:{b:1},a:1}).b + 1,
             1..b + 1
         );
     }
@@ -402,9 +480,9 @@ unsafe_function: {
     expect: {
         console.log(
             ({a:{b:1},b:function(){}}) + 1,
-            ({b:function(){}}, {b:1}) + 1,
-            ({a:{b:1}}, function(){}) + 1,
-            ({b:function(){}}, {b:1}).b + 1
+            ({a:{b:1},b:function(){}}).a + 1,
+            ({a:{b:1},b:function(){}}).b + 1,
+            ({a:{b:1},b:function(){}}).a.b + 1
         );
     }
     expect_stdout: true
@@ -652,27 +730,25 @@ unsafe_prototype_function: {
         var d = ({toString: 0}) + "";
         var e = (({valueOf: 0}) + "")[2];
         var f = (({toString: 0}) + "")[2];
-        var g = ({}, 0)();
-        var h = ({}, 0)();
+        var g = ({valueOf: 0}).valueOf();
+        var h = "" + ({toString: 0});
     }
 }
 
 call_args: {
     options = {
         evaluate: true,
-        inline: true,
         reduce_vars: true,
-        toplevel: true,
     }
     input: {
-        var a = 1;
+        const a = 1;
         console.log(a);
         +function(a) {
             return a;
         }(a);
     }
     expect: {
-        var a = 1;
+        const a = 1;
         console.log(1);
         +(1, 1);
     }
@@ -682,20 +758,19 @@ call_args: {
 call_args_drop_param: {
     options = {
         evaluate: true,
-        inline: true,
         keep_fargs: false,
         reduce_vars: true,
-        toplevel: true,
         unused: true,
     }
     input: {
-        var a = 1;
+        const a = 1;
         console.log(a);
         +function(a) {
             return a;
         }(a, b);
     }
     expect: {
+        const a = 1;
         console.log(1);
         +(b, 1);
     }
@@ -798,15 +873,13 @@ unsafe_charAt_noop: {
     input: {
         console.log(
             s.charAt(0),
-            "string".charAt(x),
-            (typeof x).charAt()
+            "string".charAt(x)
         );
     }
     expect: {
         console.log(
             s.charAt(0),
-            "string".charAt(x),
-            (typeof x)[0]
+            "string".charAt(x)
         );
     }
 }
@@ -823,365 +896,3 @@ issue_1649: {
     }
     expect_stdout: "-2";
 }
-
-issue_1760_1: {
-    options = {
-        evaluate: true,
-    }
-    input: {
-        !function(a) {
-            try {
-                throw 0;
-            } catch (NaN) {
-                a = +"foo";
-            }
-            console.log(a);
-        }();
-    }
-    expect: {
-        !function(a) {
-            try {
-                throw 0;
-            } catch (NaN) {
-                a = 0 / 0;
-            }
-            console.log(a);
-        }();
-    }
-    expect_stdout: "NaN"
-}
-
-issue_1760_2: {
-    options = {
-        evaluate: true,
-        keep_infinity: true,
-    }
-    input: {
-        !function(a) {
-            try {
-                throw 0;
-            } catch (Infinity) {
-                a = 123456789 / 0;
-            }
-            console.log(a);
-        }();
-    }
-    expect: {
-        !function(a) {
-            try {
-                throw 0;
-            } catch (Infinity) {
-                a = 1 / 0;
-            }
-            console.log(a);
-        }();
-    }
-    expect_stdout: "Infinity"
-}
-
-delete_expr_1: {
-    options = {
-        booleans: true,
-        evaluate: true,
-    }
-    input: {
-        console.log(delete undefined);
-        console.log(delete void 0);
-        console.log(delete Infinity);
-        console.log(delete (1 / 0));
-        console.log(delete NaN);
-        console.log(delete (0 / 0));
-    }
-    expect: {
-        console.log(delete undefined);
-        console.log((void 0, !0));
-        console.log(delete Infinity);
-        console.log((1 / 0, !0));
-        console.log(delete NaN);
-        console.log((0 / 0, !0));
-    }
-    expect_stdout: true
-}
-
-delete_expr_2: {
-    options = {
-        booleans: true,
-        evaluate: true,
-        keep_infinity: true,
-    }
-    input: {
-        console.log(delete undefined);
-        console.log(delete void 0);
-        console.log(delete Infinity);
-        console.log(delete (1 / 0));
-        console.log(delete NaN);
-        console.log(delete (0 / 0));
-    }
-    expect: {
-        console.log(delete undefined);
-        console.log((void 0, !0));
-        console.log(delete Infinity);
-        console.log((1 / 0, !0));
-        console.log(delete NaN);
-        console.log((0 / 0, !0));
-    }
-    expect_stdout: true
-}
-
-delete_binary_1: {
-    options = {
-        booleans: true,
-        evaluate: true,
-        side_effects: true,
-    }
-    input: {
-        console.log(delete (true && undefined));
-        console.log(delete (true && void 0));
-        console.log(delete (true && Infinity));
-        console.log(delete (true && (1 / 0)));
-        console.log(delete (true && NaN));
-        console.log(delete (true && (0 / 0)));
-    }
-    expect: {
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-    }
-    expect_stdout: true
-}
-
-delete_binary_2: {
-    options = {
-        booleans: true,
-        evaluate: true,
-        keep_infinity: true,
-        side_effects: true,
-    }
-    input: {
-        console.log(delete (false || undefined));
-        console.log(delete (false || void 0));
-        console.log(delete (false || Infinity));
-        console.log(delete (false || (1 / 0)));
-        console.log(delete (false || NaN));
-        console.log(delete (false || (0 / 0)));
-    }
-    expect: {
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-    }
-    expect_stdout: true
-}
-
-Infinity_NaN_undefined_LHS: {
-    beautify = {
-        beautify: true,
-    }
-    input: {
-        function f() {
-            Infinity = Infinity;
-            ++Infinity;
-            Infinity--;
-            NaN *= NaN;
-            ++NaN;
-            NaN--;
-            undefined |= undefined;
-            ++undefined;
-            undefined--;
-        }
-    }
-    expect_exact: [
-        "function f() {",
-        "    Infinity = 1 / 0;",
-        "    ++Infinity;",
-        "    Infinity--;",
-        "    NaN *= NaN;",
-        "    ++NaN;",
-        "    NaN--;",
-        "    undefined |= void 0;",
-        "    ++undefined;",
-        "    undefined--;",
-        "}",
-    ]
-}
-
-issue_1964_1: {
-    options = {
-        evaluate: true,
-        reduce_vars: true,
-        unsafe_regexp: false,
-        unused: true,
-    }
-    input: {
-        function f() {
-            var long_variable_name = /\s/;
-            return "a b c".split(long_variable_name)[1];
-        }
-        console.log(f());
-    }
-    expect: {
-        function f() {
-            var long_variable_name = /\s/;
-            return "a b c".split(long_variable_name)[1];
-        }
-        console.log(f());
-    }
-    expect_stdout: "b"
-}
-
-issue_1964_2: {
-    options = {
-        evaluate: true,
-        reduce_vars: true,
-        unsafe_regexp: true,
-        unused: true,
-    }
-    input: {
-        function f() {
-            var long_variable_name = /\s/;
-            return "a b c".split(long_variable_name)[1];
-        }
-        console.log(f());
-    }
-    expect: {
-        function f() {
-            return "a b c".split(/\s/)[1];
-        }
-        console.log(f());
-    }
-    expect_stdout: "b"
-}
-
-array_slice_index: {
-    options = {
-        evaluate: true,
-        unsafe: true,
-    }
-    input: {
-        console.log([1,2,3].slice(1)[1]);
-    }
-    expect: {
-        console.log(3);
-    }
-    expect_stdout: "3"
-}
-
-string_charCodeAt: {
-    options = {
-        evaluate: true,
-        unsafe: true,
-    }
-    input: {
-        console.log("foo".charCodeAt("bar".length));
-    }
-    expect: {
-        console.log(NaN);
-    }
-    expect_stdout: "NaN"
-}
-
-issue_2207_1: {
-    options = {
-        evaluate: true,
-        unsafe: true,
-    }
-    input: {
-        console.log(String.fromCharCode(65));
-        console.log(Math.max(3, 6, 2, 7, 3, 4));
-        console.log(Math.cos(1.2345));
-        console.log(Math.cos(1.2345) - Math.sin(4.321));
-        console.log(Math.pow(Math.PI, Math.E - Math.LN10));
-    }
-    expect: {
-        console.log("A");
-        console.log(7);
-        console.log(Math.cos(1.2345));
-        console.log(1.2543732512566947);
-        console.log(1.6093984514472044);
-    }
-    expect_stdout: true
-}
-
-issue_2207_2: {
-    options = {
-        evaluate: true,
-        unsafe: true,
-    }
-    input: {
-        console.log(Math.E);
-        console.log(Math.LN10);
-        console.log(Math.LN2);
-        console.log(Math.LOG2E);
-        console.log(Math.LOG10E);
-        console.log(Math.PI);
-        console.log(Math.SQRT1_2);
-        console.log(Math.SQRT2);
-    }
-    expect: {
-        console.log(Math.E);
-        console.log(Math.LN10);
-        console.log(Math.LN2);
-        console.log(Math.LOG2E);
-        console.log(Math.LOG10E);
-        console.log(Math.PI);
-        console.log(Math.SQRT1_2);
-        console.log(Math.SQRT2);
-    }
-    expect_stdout: true
-}
-
-issue_2207_3: {
-    options = {
-        evaluate: true,
-        unsafe: true,
-    }
-    input: {
-        console.log(Number.MAX_VALUE);
-        console.log(Number.MIN_VALUE);
-        console.log(Number.NaN);
-        console.log(Number.NEGATIVE_INFINITY);
-        console.log(Number.POSITIVE_INFINITY);
-    }
-    expect: {
-        console.log(Number.MAX_VALUE);
-        console.log(5e-324);
-        console.log(NaN);
-        console.log(-1/0);
-        console.log(1/0);
-    }
-    expect_stdout: true
-}
-
-issue_2231_1: {
-    options = {
-        evaluate: true,
-        unsafe: true,
-    }
-    input: {
-        console.log(Object.keys(void 0));
-    }
-    expect: {
-        console.log(Object.keys(void 0));
-    }
-    expect_stdout: true
-}
-
-issue_2231_2: {
-    options = {
-        evaluate: true,
-        unsafe: true,
-    }
-    input: {
-        console.log(Object.getOwnPropertyNames(null));
-    }
-    expect: {
-        console.log(Object.getOwnPropertyNames(null));
-    }
-    expect_stdout: true
-}

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

@@ -21,7 +21,6 @@ iifes_returning_constants_keep_fargs_true: {
         join_vars     : true,
         reduce_vars   : true,
         cascade       : true,
-        inline        : true,
     }
     input: {
         (function(){ return -1.23; }());
@@ -57,7 +56,6 @@ iifes_returning_constants_keep_fargs_false: {
         join_vars     : true,
         reduce_vars   : true,
         cascade       : true,
-        inline        : true,
     }
     input: {
         (function(){ return -1.23; }());
@@ -84,7 +82,6 @@ issue_485_crashing_1530: {
         conditionals: true,
         dead_code: true,
         evaluate: true,
-        inline: true,
     }
     input: {
         (function(a) {
@@ -96,415 +93,3 @@ issue_485_crashing_1530: {
         this, void 0;
     }
 }
-
-issue_1841_1: {
-    options = {
-        keep_fargs: false,
-        pure_getters: "strict",
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        var b = 10;
-        !function(arg) {
-            for (var key in "hi")
-                var n = arg.baz, n = [ b = 42 ];
-        }(--b);
-        console.log(b);
-    }
-    expect: {
-        var b = 10;
-        !function() {
-            for (var key in "hi")
-                b = 42;
-        }(--b);
-        console.log(b);
-    }
-    expect_exact: "42"
-}
-
-issue_1841_2: {
-    options = {
-        keep_fargs: false,
-        pure_getters: false,
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        var b = 10;
-        !function(arg) {
-            for (var key in "hi")
-                var n = arg.baz, n = [ b = 42 ];
-        }(--b);
-        console.log(b);
-    }
-    expect: {
-        var b = 10;
-        !function(arg) {
-            for (var key in "hi")
-                arg.baz, b = 42;
-        }(--b);
-        console.log(b);
-    }
-    expect_exact: "42"
-}
-
-function_returning_constant_literal: {
-    options = {
-        reduce_vars: true,
-        unsafe: true,
-        toplevel: true,
-        evaluate: true,
-        cascade: true,
-        unused: true,
-        inline: true,
-    }
-    input: {
-        function greeter() {
-            return { message: 'Hello there' };
-        }
-        var greeting = greeter();
-        console.log(greeting.message);
-    }
-    expect: {
-        console.log("Hello there");
-    }
-    expect_stdout: "Hello there"
-}
-
-hoist_funs: {
-    options = {
-        hoist_funs: true,
-    }
-    input: {
-        console.log(1, typeof f, typeof g);
-        if (console.log(2, typeof f, typeof g))
-            console.log(3, typeof f, typeof g);
-        else {
-            console.log(4, typeof f, typeof g);
-            function f() {}
-            console.log(5, typeof f, typeof g);
-        }
-        function g() {}
-        console.log(6, typeof f, typeof g);
-    }
-    expect: {
-        function f() {}
-        function g() {}
-        console.log(1, typeof f, typeof g);
-        if (console.log(2, typeof f, typeof g))
-            console.log(3, typeof f, typeof g);
-        else {
-            console.log(4, typeof f, typeof g);
-            console.log(5, typeof f, typeof g);
-        }
-        console.log(6, typeof f, typeof g);
-    }
-    expect_stdout: [
-        "1 'function' 'function'",
-        "2 'function' 'function'",
-        "4 'function' 'function'",
-        "5 'function' 'function'",
-        "6 'function' 'function'",
-    ]
-    node_version: "<=4"
-}
-
-hoist_funs_strict: {
-    options = {
-        hoist_funs: true,
-    }
-    input: {
-        "use strict";
-        console.log(1, typeof f, typeof g);
-        if (console.log(2, typeof f, typeof g))
-            console.log(3, typeof f, typeof g);
-        else {
-            console.log(4, typeof f, typeof g);
-            function f() {}
-            console.log(5, typeof f, typeof g);
-        }
-        function g() {}
-        console.log(6, typeof f, typeof g);
-    }
-    expect: {
-        "use strict";
-        function g() {}
-        console.log(1, typeof f, typeof g);
-        if (console.log(2, typeof f, typeof g))
-            console.log(3, typeof f, typeof g);
-        else {
-            console.log(4, typeof f, typeof g);
-            function f() {}
-            console.log(5, typeof f, typeof g);
-        }
-        console.log(6, typeof f, typeof g);
-    }
-    expect_stdout: [
-        "1 'undefined' 'function'",
-        "2 'undefined' 'function'",
-        "4 'function' 'function'",
-        "5 'function' 'function'",
-        "6 'undefined' 'function'",
-    ]
-    node_version: ">=4"
-}
-
-issue_203: {
-    options = {
-        keep_fargs: false,
-        side_effects: true,
-        unsafe_Func: true,
-        unused: true,
-    }
-    input: {
-        var m = {};
-        var fn = Function("require", "module", "exports", "module.exports = 42;");
-        fn(null, m, m.exports);
-        console.log(m.exports);
-    }
-    expect: {
-        var m = {};
-        var fn = Function("n,o", "o.exports=42");
-        fn(null, m, m.exports);
-        console.log(m.exports);
-    }
-    expect_stdout: "42"
-}
-
-no_webkit: {
-    beautify = {
-        webkit: false,
-    }
-    input: {
-        console.log(function() {
-            1 + 1;
-        }.a = 1);
-    }
-    expect_exact: "console.log(function(){1+1}.a=1);"
-    expect_stdout: "1"
-}
-
-webkit: {
-    beautify = {
-        webkit: true,
-    }
-    input: {
-        console.log(function() {
-            1 + 1;
-        }.a = 1);
-    }
-    expect_exact: "console.log((function(){1+1}).a=1);"
-    expect_stdout: "1"
-}
-
-issue_2084: {
-    options = {
-        collapse_vars: true,
-        conditionals: true,
-        evaluate: true,
-        inline: true,
-        passes: 2,
-        reduce_vars: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        var c = 0;
-        !function() {
-            !function(c) {
-                c = 1 + c;
-                var c = 0;
-                function f14(a_1) {
-                    if (c = 1 + c, 0 !== 23..toString())
-                        c = 1 + c, a_1 && (a_1[0] = 0);
-                }
-                f14();
-            }(-1);
-        }();
-        console.log(c);
-    }
-    expect: {
-        var c = 0;
-        !function(c) {
-            c = 1 + c,
-            c = 1 + (c = 0),
-            0 !== 23..toString() && (c = 1 + c);
-        }(-1),
-        console.log(c);
-    }
-    expect_stdout: "0"
-}
-
-issue_2097: {
-    options = {
-        negate_iife: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        function f() {
-            try {
-                throw 0;
-            } catch (e) {
-                console.log(arguments[0]);
-            }
-        }
-        f(1);
-    }
-    expect: {
-        !function() {
-            try {
-                throw 0;
-            } catch (e) {
-                console.log(arguments[0]);
-            }
-        }(1);
-    }
-    expect_stdout: "1"
-}
-
-issue_2101: {
-    options = {
-        inline: true,
-    }
-    input: {
-        a = {};
-        console.log(function() {
-            return function() {
-                return this.a;
-            }();
-        }() === function() {
-            return a;
-        }());
-    }
-    expect: {
-        a = {};
-        console.log(function() {
-            return this.a;
-        }() === a);
-    }
-    expect_stdout: "true"
-}
-
-inner_ref: {
-    options = {
-        inline: true,
-        unused: true,
-    }
-    input: {
-        console.log(function(a) {
-            return function() {
-                return a;
-            }();
-        }(1), function(a) {
-            return function(a) {
-                return a;
-            }();
-        }(2));
-    }
-    expect: {
-        console.log(function(a) {
-            return a;
-        }(1), function(a) {
-            return a;
-        }());
-    }
-    expect_stdout: "1 undefined"
-}
-
-issue_2107: {
-    options = {
-        cascade: true,
-        collapse_vars: true,
-        inline: true,
-        sequences: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        var c = 0;
-        !function() {
-            c++;
-        }(c++ + new function() {
-            this.a = 0;
-            var a = (c = c + 1) + (c = 1 + c);
-            return c++ + a;
-        }());
-        console.log(c);
-    }
-    expect: {
-        var c = 0;
-        c++, new function() {
-            this.a = 0, c = 1 + (c += 1), c++;
-        }(), c++, console.log(c);
-    }
-    expect_stdout: "5"
-}
-
-issue_2114_1: {
-    options = {
-        collapse_vars: true,
-        if_return: true,
-        inline: true,
-        keep_fargs: false,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        var c = 0;
-        !function(a) {
-            a = 0;
-        }([ {
-            0: c = c + 1,
-            length: c = 1 + c
-        }, typeof void function a() {
-            var b = function f1(a) {
-            }(b && (b.b += (c = c + 1, 0)));
-        }() ]);
-        console.log(c);
-    }
-    expect: {
-        var c = 0;
-        c = 1 + (c += 1), function() {
-            var b = void (b && (b.b += (c += 1, 0)));
-        }();
-        console.log(c);
-    }
-    expect_stdout: "2"
-}
-
-issue_2114_2: {
-    options = {
-        collapse_vars: true,
-        if_return: true,
-        inline: true,
-        keep_fargs: false,
-        passes: 2,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        var c = 0;
-        !function(a) {
-            a = 0;
-        }([ {
-            0: c = c + 1,
-            length: c = 1 + c
-        }, typeof void function a() {
-            var b = function f1(a) {
-            }(b && (b.b += (c = c + 1, 0)));
-        }() ]);
-        console.log(c);
-    }
-    expect: {
-        var c = 0;
-        c = 1 + (c += 1), function() {
-            var b = void (b && (b.b += (c += 1, 0)));
-        }();
-        console.log(c);
-    }
-    expect_stdout: "2"
-}

test/compress/global_defs.js

@@ -37,7 +37,6 @@ object: {
                 VALUE: 42,
             },
         },
-        side_effects: true,
         unsafe: true,
     }
     input: {
@@ -121,7 +120,7 @@ mixed: {
         properties: true,
     }
     input: {
-        var FOO = { BAR: 0 };
+        const FOO = { BAR: 0 };
         console.log(FOO.BAR);
         console.log(++CONFIG.DEBUG);
         console.log(++CONFIG.VALUE);
@@ -131,7 +130,7 @@ mixed: {
         console.log(CONFIG);
     }
     expect: {
-        var FOO = { BAR: 0 };
+        const FOO = { BAR: 0 };
         console.log("moo");
         console.log(++CONFIG.DEBUG);
         console.log(++CONFIG.VALUE);
@@ -141,58 +140,8 @@ mixed: {
         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:128,22]',
-        'WARN: global_defs CONFIG.VALUE redefined [test/compress/global_defs.js:130,8]',
+        'WARN: global_defs CONFIG.VALUE redefined [test/compress/global_defs.js:129,8]',
     ]
 }
-
-issue_1801: {
-    options = {
-        booleans: true,
-        global_defs: {
-            "CONFIG.FOO.BAR": true,
-        },
-    }
-    input: {
-        console.log(CONFIG.FOO.BAR);
-    }
-    expect: {
-        console.log(!0);
-    }
-}
-
-issue_1986: {
-    options = {
-        global_defs: {
-            "@alert": "console.log",
-        },
-    }
-    input: {
-        alert(42);
-    }
-    expect: {
-        console.log(42);
-    }
-}
-
-issue_2167: {
-    options = {
-        conditionals: true,
-        dead_code: true,
-        evaluate: true,
-        global_defs: {
-            "@isDevMode": "function(){}",
-        },
-        side_effects: true,
-    }
-    input: {
-        if (isDevMode()) {
-            greetOverlord();
-        }
-        doWork();
-    }
-    expect: {
-        doWork();
-    }
-}

test/compress/harmony.js

@@ -0,0 +1,342 @@
+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{};"
+}
+
+export_module_statement: {
+    input: {
+        export * from "a.js";
+        export {A} from "a.js";
+        export {A, B} from "a.js";
+    }
+    expect_exact: 'export*from"a.js";export{A}from"a.js";export{A,B}from"a.js";'
+}
+
+import_statement_mangling: {
+    mangle = { toplevel: true };
+    input: {
+        import Foo from "foo";
+        import Bar, {Food} from "lel";
+        import {What as Whatever} from "lel";
+        Foo();
+        Bar();
+        Food();
+        Whatever();
+    }
+    expect: {
+        import 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));"
+}
+
+default_assign: {
+    options = {
+        keep_fargs: false,
+        unused: true,
+    }
+    input: {
+        function f(a, b = 3) {
+            console.log(a);
+        }
+    }
+    expect: {
+        function f(a) {
+            console.log(a);
+        }
+    }
+}
+
+expansion: {
+    options = {
+        keep_fargs: false,
+        unused: true,
+    }
+    input: {
+        function f(a, ...b) {
+            console.log(a);
+        }
+    }
+    expect: {
+        function f(a) {
+            console.log(a);
+        }
+    }
+}
+
+issue_1613: {
+  mangle = { toplevel: true };
+  input: {
+    const name = 1;
+    const foo = {
+      name
+    };
+  }
+  expect_exact: "const n=1;const c={name:n};"
+}

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

@@ -88,24 +88,3 @@ sequences_funs: {
         }
     }
 }
-
-issue_2295: {
-    options = {
-        collapse_vars: true,
-        hoist_vars: true,
-    }
-    input: {
-        function foo(o) {
-            var a = o.a;
-            if (a) return a;
-            var a = 1;
-        }
-    }
-    expect: {
-        function foo(o) {
-            var a = o.a;
-            if (a) return a;
-            a = 1;
-        }
-    }
-}

test/compress/html_comments.js

@@ -53,3 +53,12 @@ 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

@@ -302,27 +302,3 @@ issue_1437_conditionals: {
         }
     }
 }
-
-issue_512: {
-    options = {
-        conditionals: true,
-        if_return: true,
-        sequences: true,
-        side_effects: true,
-    }
-    input: {
-        function a() {
-            if (b()) {
-                c();
-                return;
-            }
-            throw e;
-        }
-    }
-    expect: {
-        function a() {
-            if (!b()) throw e;
-            c();
-        }
-    }
-}

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-1034.js

@@ -71,13 +71,11 @@ non_hoisted_function_after_return_2a: {
         "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:51,16]",
         "WARN: Dropping unused variable a [test/compress/issue-1034.js:48,20]",
         "WARN: Dropping unused function nope [test/compress/issue-1034.js:55,21]",
-        "WARN: pass 0: last_count: Infinity, count: 37",
         "WARN: Dropping unreachable code [test/compress/issue-1034.js:53,12]",
         "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:53,12]",
         "WARN: Dropping unreachable code [test/compress/issue-1034.js:56,12]",
         "WARN: Dropping unused variable b [test/compress/issue-1034.js:51,20]",
         "WARN: Dropping unused variable c [test/compress/issue-1034.js:53,16]",
-        "WARN: pass 1: last_count: 37, count: 18",
     ]
 }
 
@@ -111,146 +109,10 @@ non_hoisted_function_after_return_2b: {
     }
     expect_warnings: [
         // duplicate warnings no longer emitted
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:97,16]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:97,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:99,12]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:99,12]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:103,12]",
-    ]
-}
-
-non_hoisted_function_after_return_strict: {
-    options = {
-        hoist_funs: false, dead_code: true, conditionals: true, comparisons: true,
-        evaluate: true, booleans: true, loops: true, unused: true, keep_fargs: true,
-        if_return: true, join_vars: true, cascade: true, side_effects: true
-    }
-    input: {
-        "use strict";
-        function foo(x) {
-            if (x) {
-                return bar();
-                not_called1();
-            } else {
-                return baz();
-                not_called2();
-            }
-            function bar() { return 7; }
-            return not_reached;
-            function UnusedFunction() {}
-            function baz() { return 8; }
-        }
-        console.log(foo(0), foo(1));
-    }
-    expect: {
-        "use strict";
-        function foo(x) {
-            return x ? bar() : baz();
-            function bar() { return 7 }
-            function baz() { return 8 }
-        }
-        console.log(foo(0), foo(1));
-    }
-    expect_stdout: "8 7"
-    expect_warnings: [
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:133,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:136,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:139,12]",
-        "WARN: Dropping unused function UnusedFunction [test/compress/issue-1034.js:140,21]",
-    ]
-}
-
-non_hoisted_function_after_return_2a_strict: {
-    options = {
-        hoist_funs: false, dead_code: true, conditionals: true, comparisons: true,
-        evaluate: true, booleans: true, loops: true, unused: true, keep_fargs: true,
-        if_return: true, join_vars: true, cascade: true, side_effects: true,
-        collapse_vars: false, passes: 2, warnings: "verbose"
-    }
-    input: {
-        "use strict";
-        function foo(x) {
-            if (x) {
-                return bar(1);
-                var a = not_called(1);
-            } else {
-                return bar(2);
-                var b = not_called(2);
-            }
-            var c = bar(3);
-            function bar(x) { return 7 - x; }
-            function nope() {}
-            return b || c;
-        }
-        console.log(foo(0), foo(1));
-    }
-    expect: {
-        "use strict";
-        function foo(x) {
-            return bar(x ? 1 : 2);
-            function bar(x) {
-                return 7 - x;
-            }
-        }
-        console.log(foo(0), foo(1));
-    }
-    expect_stdout: "5 6"
-    expect_warnings: [
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:175,16]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:175,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:178,16]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:178,16]",
-        "WARN: Dropping unused variable a [test/compress/issue-1034.js:175,20]",
-        "WARN: Dropping unused function nope [test/compress/issue-1034.js:182,21]",
-        "WARN: pass 0: last_count: Infinity, count: 48",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:180,12]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:180,12]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:183,12]",
-        "WARN: Dropping unused variable b [test/compress/issue-1034.js:178,20]",
-        "WARN: Dropping unused variable c [test/compress/issue-1034.js:180,16]",
-        "WARN: pass 1: last_count: 48, count: 29",
-    ]
-}
-
-non_hoisted_function_after_return_2b_strict: {
-    options = {
-        hoist_funs: false, dead_code: true, conditionals: true, comparisons: true,
-        evaluate: true, booleans: true, loops: true, unused: true, keep_fargs: true,
-        if_return: true, join_vars: true, cascade: true, side_effects: true,
-        collapse_vars: false
-    }
-    input: {
-        "use strict";
-        function foo(x) {
-            if (x) {
-                return bar(1);
-            } else {
-                return bar(2);
-                var b;
-            }
-            var c = bar(3);
-            function bar(x) {
-                return 7 - x;
-            }
-            return b || c;
-        }
-        console.log(foo(0), foo(1));
-    }
-    expect: {
-        "use strict";
-        function foo(x) {
-            return bar(x ? 1 : 2);
-            function bar(x) { return 7 - x; }
-        }
-        console.log(foo(0), foo(1));
-    }
-    expect_stdout: "5 6"
-    expect_warnings: [
-        // duplicate warnings no longer emitted
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:229,16]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:229,16]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:231,12]",
-        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:231,12]",
-        "WARN: Dropping unreachable code [test/compress/issue-1034.js:235,12]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:95,16]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:95,16]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:97,12]",
+        "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:97,12]",
+        "WARN: Dropping unreachable code [test/compress/issue-1034.js:101,12]",
     ]
 }

test/compress/issue-1041.js

@@ -1,3 +1,16 @@
+const_declaration: {
+    options = {
+        evaluate: true
+    };
+
+    input: {
+        const goog = goog || {};
+    }
+    expect: {
+        const goog = goog || {};
+    }
+}
+
 const_pragma: {
     options = {
         evaluate: true,

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-1052.js

@@ -1,91 +1,90 @@
 multiple_functions: {
-    options = {
-        hoist_funs: false,
-        if_return: true,
-    }
+    options = { if_return: true, hoist_funs: false };
     input: {
         ( function() {
             if ( !window ) {
                 return;
             }
+
             function f() {}
             function g() {}
         } )();
     }
     expect: {
         ( function() {
+            function f() {}
+            function g() {}
+
             // NOTE: other compression steps will reduce this
             // down to just `window`.
             if ( window );
-            function f() {}
-            function g() {}
         } )();
     }
 }
 
 single_function: {
-    options = {
-        hoist_funs: false,
-        if_return: true,
-    }
+    options = { if_return: true, hoist_funs: false };
     input: {
         ( function() {
             if ( !window ) {
                 return;
             }
+
             function f() {}
         } )();
     }
     expect: {
         ( function() {
-            if ( window );
             function f() {}
+
+            if ( window );
         } )();
     }
 }
 
 deeply_nested: {
-    options = {
-        hoist_funs: false,
-        if_return: true,
-    }
+    options = { if_return: true, hoist_funs: false };
     input: {
         ( function() {
             if ( !window ) {
                 return;
             }
+
             function f() {}
             function g() {}
+
             if ( !document ) {
                 return;
             }
+
             function h() {}
         } )();
     }
     expect: {
         ( function() {
+            function f() {}
+            function g() {}
+
+            function h() {}
+
             // NOTE: other compression steps will reduce this
             // down to just `window`.
             if ( window )
                 if (document);
-            function f() {}
-            function g() {}
-            function h() {}
         } )();
     }
 }
 
 not_hoisted_when_already_nested: {
-    options = {
-        hoist_funs: false,
-        if_return: true,
-    }
+    options = { if_return: true, hoist_funs: false };
     input: {
         ( function() {
             if ( !window ) {
                 return;
             }
+
             if ( foo ) function f() {}
+
         } )();
     }
     expect: {
@@ -95,70 +94,3 @@ not_hoisted_when_already_nested: {
         } )();
     }
 }
-
-defun_if_return: {
-    options = {
-        hoist_funs: false,
-        if_return: true,
-    }
-    input: {
-        function e() {
-            function f() {}
-            if (!window) return;
-            else function g() {}
-            function h() {}
-        }
-    }
-    expect: {
-        function e() {
-            function f() {}
-            if (window) function g() {}
-            function h() {}
-        }
-    }
-}
-
-defun_hoist_funs: {
-    options = {
-        hoist_funs: true,
-        if_return: true,
-    }
-    input: {
-        function e() {
-            function f() {}
-            if (!window) return;
-            else function g() {}
-            function h() {}
-        }
-    }
-    expect: {
-        function e() {
-            function f() {}
-            function g() {}
-            function h() {}
-            if (window);
-        }
-    }
-}
-
-defun_else_if_return: {
-    options = {
-        hoist_funs: false,
-        if_return: true,
-    }
-    input: {
-        function e() {
-            function f() {}
-            if (window) function g() {}
-            else return;
-            function h() {}
-        }
-    }
-    expect: {
-        function e() {
-            function f() {}
-            if (window) function g() {}
-            function h() {}
-        }
-    }
-}

test/compress/issue-1105.js

@@ -193,15 +193,13 @@ assorted_Infinity_NaN_undefined_in_with_scope: {
         cascade:       true,
         side_effects:  true,
         sequences:     false,
-        keep_infinity: false,
     }
     input: {
-        var f = console.log;
         var o = {
             undefined : 3,
             NaN       : 4,
             Infinity  : 5,
-        };
+        }
         if (o) {
             f(undefined, void 0);
             f(NaN, 0/0);
@@ -218,88 +216,25 @@ assorted_Infinity_NaN_undefined_in_with_scope: {
         }
     }
     expect: {
-        var f = console.log, o = {
+        var o = {
             undefined : 3,
             NaN       : 4,
             Infinity  : 5
-        };
+        }
         if (o) {
             f(void 0, void 0);
             f(NaN, NaN);
             f(1/0, 1/0);
-            f(-1/0, -1/0);
+            f(-(1/0), -(1/0));
             f(NaN, NaN);
         }
         with (o) {
             f(undefined, void 0);
             f(NaN, 0/0);
             f(Infinity, 1/0);
-            f(-Infinity, -1/0);
+            f(-Infinity, -(1/0));
             f(9 + undefined, 9 + void 0);
         }
     }
-    expect_stdout: true
 }
 
-assorted_Infinity_NaN_undefined_in_with_scope_keep_infinity: {
-    options = {
-        unused:        true,
-        evaluate:      true,
-        dead_code:     true,
-        conditionals:  true,
-        comparisons:   true,
-        booleans:      true,
-        hoist_funs:    true,
-        keep_fargs:    true,
-        if_return:     true,
-        join_vars:     true,
-        cascade:       true,
-        side_effects:  true,
-        sequences:     false,
-        keep_infinity: true,
-    }
-    input: {
-        var f = console.log;
-        var o = {
-            undefined : 3,
-            NaN       : 4,
-            Infinity  : 5,
-        };
-        if (o) {
-            f(undefined, void 0);
-            f(NaN, 0/0);
-            f(Infinity, 1/0);
-            f(-Infinity, -(1/0));
-            f(2 + 7 + undefined, 2 + 7 + void 0);
-        }
-        with (o) {
-            f(undefined, void 0);
-            f(NaN, 0/0);
-            f(Infinity, 1/0);
-            f(-Infinity, -(1/0));
-            f(2 + 7 + undefined, 2 + 7 + void 0);
-        }
-    }
-    expect: {
-        var f = console.log, o = {
-            undefined : 3,
-            NaN       : 4,
-            Infinity  : 5
-        };
-        if (o) {
-            f(void 0, void 0);
-            f(NaN, NaN);
-            f(Infinity, 1/0);
-            f(-Infinity, -1/0);
-            f(NaN, NaN);
-        }
-        with (o) {
-            f(undefined, void 0);
-            f(NaN, 0/0);
-            f(Infinity, 1/0);
-            f(-Infinity, -1/0);
-            f(9 + undefined, 9 + void 0);
-        }
-    }
-    expect_stdout: true
-}

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

@@ -96,13 +96,6 @@ pure_function_calls_toplevel: {
             })();
         })();
 
-        // pure top-level calls will be dropped regardless of the leading comments position
-        var MyClass = /*#__PURE__*//*@class*/(function(){
-            function MyClass() {}
-            MyClass.prototype.method = function() {};
-            return MyClass;
-        })();
-
         // comment #__PURE__ comment
         bar(), baz(), quux();
         a.b(), /* @__PURE__ */ c.d.e(), f.g();
@@ -117,12 +110,10 @@ pure_function_calls_toplevel: {
         "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:92,37]",
         "WARN: Dropping unused variable iife2 [test/compress/issue-1261.js:92,16]",
         "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:90,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:107,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:108,31]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js: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]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:100,45]",
-        "WARN: Dropping unused variable MyClass [test/compress/issue-1261.js:100,12]",
     ]
 }
 
@@ -157,29 +148,29 @@ should_warn: {
         baz();
     }
     expect_warnings: [
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:137,61]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:137,23]",
-        "WARN: Dropping side-effect-free statement [test/compress/issue-1261.js:137,23]",
-        "WARN: Boolean || always true [test/compress/issue-1261.js:138,23]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:138,23]",
-        "WARN: Condition always true [test/compress/issue-1261.js:138,23]",
-        "WARN: Condition left of || always true [test/compress/issue-1261.js:139,8]",
-        "WARN: Condition always true [test/compress/issue-1261.js:139,8]",
-        "WARN: Boolean && always false [test/compress/issue-1261.js:140,23]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:140,23]",
-        "WARN: Condition always false [test/compress/issue-1261.js:140,23]",
-        "WARN: Condition left of && always false [test/compress/issue-1261.js:141,8]",
-        "WARN: Condition always false [test/compress/issue-1261.js:141,8]",
-        "WARN: + in boolean context always true [test/compress/issue-1261.js:142,23]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:142,23]",
-        "WARN: Condition always true [test/compress/issue-1261.js:142,23]",
-        "WARN: + in boolean context always true [test/compress/issue-1261.js:143,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:143,31]",
-        "WARN: Condition always true [test/compress/issue-1261.js:143,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:144,23]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:145,24]",
-        "WARN: Condition always true [test/compress/issue-1261.js:145,8]",
-        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js:146,31]",
-        "WARN: Condition always false [test/compress/issue-1261.js:146,8]",
+        "WARN: Dropping __PURE__ call [test/compress/issue-1261.js: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-1321.js

@@ -1,8 +1,6 @@
 issue_1321_no_debug: {
-    mangle = {
-        properties: {
-            keep_quoted: true,
-        },
+    mangle_props = {
+        ignore_quoted: true
     }
     input: {
         var x = {};
@@ -12,19 +10,17 @@ issue_1321_no_debug: {
     }
     expect: {
         var x = {};
-        x.x = 1;
-        x["a"] = 2 * x.x;
-        console.log(x.x, x["a"]);
+        x.b = 1;
+        x["a"] = 2 * x.b;
+        console.log(x.b, x["a"]);
     }
     expect_stdout: true
 }
 
 issue_1321_debug: {
-    mangle = {
-        properties: {
-            debug: "",
-            keep_quoted: true,
-        },
+    mangle_props = {
+        ignore_quoted: true,
+        debug: ""
     }
     input: {
         var x = {};
@@ -34,18 +30,16 @@ issue_1321_debug: {
     }
     expect: {
         var x = {};
-        x.x = 1;
-        x["_$foo$_"] = 2 * x.x;
-        console.log(x.x, x["_$foo$_"]);
+        x.a = 1;
+        x["_$foo$_"] = 2 * x.a;
+        console.log(x.a, x["_$foo$_"]);
     }
     expect_stdout: true
 }
 
 issue_1321_with_quoted: {
-    mangle = {
-        properties: {
-            keep_quoted: false,
-        },
+    mangle_props = {
+        ignore_quoted: false
     }
     input: {
         var x = {};
@@ -55,9 +49,9 @@ issue_1321_with_quoted: {
     }
     expect: {
         var x = {};
-        x.x = 1;
-        x["o"] = 2 * x.x;
-        console.log(x.x, x["o"]);
+        x.a = 1;
+        x["b"] = 2 * x.a;
+        console.log(x.a, x["b"]);
     }
     expect_stdout: true
 }

test/compress/issue-1446.js

@@ -1,7 +1,6 @@
 typeof_eq_undefined: {
     options = {
-        comparisons: true,
-        typeofs: true,
+        comparisons: true
     }
     input: {
         var a = typeof b != "undefined";
@@ -24,8 +23,7 @@ typeof_eq_undefined: {
 typeof_eq_undefined_ie8: {
     options = {
         comparisons: true,
-        ie8: true,
-        typeofs: true,
+        screw_ie8: false
     }
     input: {
         var a = typeof b != "undefined";
@@ -47,8 +45,7 @@ typeof_eq_undefined_ie8: {
 
 undefined_redefined: {
     options = {
-        comparisons: true,
-        typeofs: true,
+        comparisons: true
     }
     input: {
         function f(undefined) {
@@ -61,8 +58,7 @@ undefined_redefined: {
 
 undefined_redefined_mangle: {
     options = {
-        comparisons: true,
-        typeofs: true,
+        comparisons: true
     }
     mangle = {}
     input: {

test/compress/issue-1466.js

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

test/compress/issue-1588.js

@@ -1,9 +1,9 @@
 screw_ie8: {
     options = {
-        ie8: false,
+        screw_ie8: true,
     }
     mangle = {
-        ie8: false,
+        screw_ie8: true,
     }
     input: {
         try { throw "foo"; } catch (x) { console.log(x); }
@@ -16,10 +16,10 @@ screw_ie8: {
 
 support_ie8: {
     options = {
-        ie8: true,
+        screw_ie8: false,
     }
     mangle = {
-        ie8: true,
+        screw_ie8: false,
     }
     input: {
         try { throw "foo"; } catch (x) { console.log(x); }
@@ -85,3 +85,15 @@ unsafe_undefined: {
     }
     expect_stdout: true
 }
+
+runtime_error: {
+    input: {
+        const a = 1;
+        console.log(a++);
+    }
+    expect: {
+        const a = 1;
+        console.log(a++);
+    }
+    expect_stdout: true
+}

test/compress/issue-1609.js

@@ -18,7 +18,9 @@ chained_evaluation_1: {
     expect: {
         (function() {
             (function() {
-                f(1).bar = 1;
+                var c;
+                c = f(1);
+                c.bar = 1;
             })();
         })();
     }
@@ -43,9 +45,11 @@ chained_evaluation_2: {
     }
     expect: {
         (function() {
+            var a = "long piece of string";
             (function() {
-                var b = "long piece of string";
-                f(b).bar = b;
+                var c;
+                c = f(a);
+                c.bar = a;
             })();
         })();
     }

test/compress/issue-1656.js

@@ -35,11 +35,11 @@ f7: {
         console.log(a, b);
     }
     expect_exact: [
-        "var b = 10;",
+        "var a = 100, b = 10;",
         "",
         "!function() {",
-        "    for (;b = 100, !1; ) ;",
-        "}(), console.log(100, b);",
+        "    for (;b = a, !1; ) ;",
+        "}(), console.log(a, b);",
     ]
     expect_stdout: true
 }

test/compress/issue-1673.js

@@ -70,7 +70,6 @@ side_effects_finally: {
         function f() {
             function g() {
                 try {
-                    x();
                 } catch (e) {
                 } finally {
                     console.log("PASS");
@@ -84,7 +83,6 @@ side_effects_finally: {
         function f() {
             (function() {
                 try {
-                    x();
                 } catch (e) {
                 } finally {
                     console.log("PASS");

test/compress/issue-1704.js

@@ -1,10 +1,10 @@
 mangle_catch: {
     options = {
-        ie8: false,
+        screw_ie8: true,
         toplevel: false,
     }
     mangle = {
-        ie8: false,
+        screw_ie8: true,
         toplevel: false,
     }
     input: {
@@ -22,11 +22,11 @@ mangle_catch: {
 
 mangle_catch_ie8: {
     options = {
-        ie8: true,
+        screw_ie8: false,
         toplevel: false,
     }
     mangle = {
-        ie8: true,
+        screw_ie8: false,
         toplevel: false,
     }
     input: {
@@ -44,11 +44,11 @@ mangle_catch_ie8: {
 
 mangle_catch_var: {
     options = {
-        ie8: false,
+        screw_ie8: true,
         toplevel: false,
     }
     mangle = {
-        ie8: false,
+        screw_ie8: true,
         toplevel: false,
     }
     input: {
@@ -66,11 +66,11 @@ mangle_catch_var: {
 
 mangle_catch_var_ie8: {
     options = {
-        ie8: true,
+        screw_ie8: false,
         toplevel: false,
     }
     mangle = {
-        ie8: true,
+        screw_ie8: false,
         toplevel: false,
     }
     input: {
@@ -88,11 +88,11 @@ mangle_catch_var_ie8: {
 
 mangle_catch_toplevel: {
     options = {
-        ie8: false,
+        screw_ie8: true,
         toplevel: true,
     }
     mangle = {
-        ie8: false,
+        screw_ie8: true,
         toplevel: true,
     }
     input: {
@@ -110,11 +110,11 @@ mangle_catch_toplevel: {
 
 mangle_catch_ie8_toplevel: {
     options = {
-        ie8: true,
+        screw_ie8: false,
         toplevel: true,
     }
     mangle = {
-        ie8: true,
+        screw_ie8: false,
         toplevel: true,
     }
     input: {
@@ -132,11 +132,11 @@ mangle_catch_ie8_toplevel: {
 
 mangle_catch_var_toplevel: {
     options = {
-        ie8: false,
+        screw_ie8: true,
         toplevel: true,
     }
     mangle = {
-        ie8: false,
+        screw_ie8: true,
         toplevel: true,
     }
     input: {
@@ -154,11 +154,11 @@ mangle_catch_var_toplevel: {
 
 mangle_catch_var_ie8_toplevel: {
     options = {
-        ie8: true,
+        screw_ie8: false,
         toplevel: true,
     }
     mangle = {
-        ie8: true,
+        screw_ie8: false,
         toplevel: true,
     }
     input: {
@@ -176,11 +176,11 @@ mangle_catch_var_ie8_toplevel: {
 
 mangle_catch_redef_1: {
     options = {
-        ie8: false,
+        screw_ie8: true,
         toplevel: false,
     }
     mangle = {
-        ie8: false,
+        screw_ie8: true,
         toplevel: false,
     }
     input: {
@@ -198,11 +198,11 @@ mangle_catch_redef_1: {
 
 mangle_catch_redef_1_ie8: {
     options = {
-        ie8: true,
+        screw_ie8: false,
         toplevel: false,
     }
     mangle = {
-        ie8: true,
+        screw_ie8: false,
         toplevel: false,
     }
     input: {
@@ -220,11 +220,11 @@ mangle_catch_redef_1_ie8: {
 
 mangle_catch_redef_1_toplevel: {
     options = {
-        ie8: false,
+        screw_ie8: true,
         toplevel: true,
     }
     mangle = {
-        ie8: false,
+        screw_ie8: true,
         toplevel: true,
     }
     input: {
@@ -242,11 +242,11 @@ mangle_catch_redef_1_toplevel: {
 
 mangle_catch_redef_1_ie8_toplevel: {
     options = {
-        ie8: true,
+        screw_ie8: false,
         toplevel: true,
     }
     mangle = {
-        ie8: true,
+        screw_ie8: false,
         toplevel: true,
     }
     input: {
@@ -264,11 +264,11 @@ mangle_catch_redef_1_ie8_toplevel: {
 
 mangle_catch_redef_2: {
     options = {
-        ie8: false,
+        screw_ie8: true,
         toplevel: false,
     }
     mangle = {
-        ie8: false,
+        screw_ie8: true,
         toplevel: false,
     }
     input: {
@@ -285,11 +285,11 @@ mangle_catch_redef_2: {
 
 mangle_catch_redef_2_ie8: {
     options = {
-        ie8: true,
+        screw_ie8: false,
         toplevel: false,
     }
     mangle = {
-        ie8: true,
+        screw_ie8: false,
         toplevel: false,
     }
     input: {
@@ -306,11 +306,11 @@ mangle_catch_redef_2_ie8: {
 
 mangle_catch_redef_2_toplevel: {
     options = {
-        ie8: false,
+        screw_ie8: true,
         toplevel: true,
     }
     mangle = {
-        ie8: false,
+        screw_ie8: true,
         toplevel: true,
     }
     input: {
@@ -327,11 +327,11 @@ mangle_catch_redef_2_toplevel: {
 
 mangle_catch_redef_2_ie8_toplevel: {
     options = {
-        ie8: true,
+        screw_ie8: false,
         toplevel: true,
     }
     mangle = {
-        ie8: true,
+        screw_ie8: false,
         toplevel: true,
     }
     input: {

test/compress/issue-1733.js

@@ -1,97 +0,0 @@
-function_iife_catch: {
-    mangle = {
-        ie8: false,
-    }
-    input: {
-        function f(n) {
-            !function() {
-                try {
-                    throw 0;
-                } catch (n) {
-                    var a = 1;
-                    console.log(n, a);
-                }
-            }();
-        }
-        f();
-    }
-    expect_exact: "function f(o){!function(){try{throw 0}catch(c){var o=1;console.log(c,o)}}()}f();"
-    expect_stdout: "0 1"
-}
-
-function_iife_catch_ie8: {
-    mangle = {
-        ie8: true,
-    }
-    input: {
-        function f(n) {
-            !function() {
-                try {
-                    throw 0;
-                } catch (n) {
-                    var a = 1;
-                    console.log(n, a);
-                }
-            }();
-        }
-        f();
-    }
-    expect_exact: "function f(o){!function(){try{throw 0}catch(o){var c=1;console.log(o,c)}}()}f();"
-    expect_stdout: "0 1"
-}
-
-function_catch_catch: {
-    mangle = {
-        ie8: false,
-    }
-    input: {
-        var o = 0;
-        function f() {
-            try {
-                throw 1;
-            } catch (c) {
-                try {
-                    throw 2;
-                } catch (o) {
-                    var o = 3;
-                    console.log(o);
-                }
-            }
-            console.log(o);
-        }
-        f();
-    }
-    expect_exact: "var o=0;function f(){try{throw 1}catch(c){try{throw 2}catch(o){var o=3;console.log(o)}}console.log(o)}f();"
-    expect_stdout: [
-        "3",
-        "undefined",
-    ]
-}
-
-function_catch_catch_ie8: {
-    mangle = {
-        ie8: true,
-    }
-    input: {
-        var o = 0;
-        function f() {
-            try {
-                throw 1;
-            } catch (c) {
-                try {
-                    throw 2;
-                } catch (o) {
-                    var o = 3;
-                    console.log(o);
-                }
-            }
-            console.log(o);
-        }
-        f();
-    }
-    expect_exact: "var o=0;function f(){try{throw 1}catch(c){try{throw 2}catch(o){var o=3;console.log(o)}}console.log(o)}f();"
-    expect_stdout: [
-        "3",
-        "undefined",
-    ]
-}

test/compress/issue-1750.js

@@ -1,54 +0,0 @@
-case_1: {
-    options = {
-        dead_code: true,
-        evaluate: true,
-        switches: true,
-    }
-    input: {
-        var a = 0, b = 1;
-        switch (true) {
-          case a, true:
-          default:
-            b = 2;
-          case true:
-        }
-        console.log(a, b);
-    }
-    expect: {
-        var a = 0, b = 1;
-        switch (true) {
-          case a, true:
-            b = 2;
-        }
-        console.log(a, b);
-    }
-    expect_stdout: "0 2"
-}
-
-case_2: {
-    options = {
-        dead_code: true,
-        evaluate: true,
-        switches: true,
-    }
-    input: {
-        var a = 0, b = 1;
-        switch (0) {
-          default:
-            b = 2;
-          case a:
-            a = 3;
-          case 0:
-        }
-        console.log(a, b);
-    }
-    expect: {
-        var a = 0, b = 1;
-        switch (0) {
-          case a:
-            a = 3;
-        }
-        console.log(a, b);
-    }
-    expect_stdout: "3 1"
-}

test/compress/issue-1770.js

@@ -1,245 +0,0 @@
-mangle_props: {
-    mangle = {
-        properties: true,
-    }
-    input: {
-        var obj = {
-            undefined: 1,
-            NaN: 2,
-            Infinity: 3,
-            "-Infinity": 4,
-            null: 5,
-        };
-        console.log(
-            obj[void 0],
-            obj[undefined],
-            obj["undefined"],
-            obj[0/0],
-            obj[NaN],
-            obj["NaN"],
-            obj[1/0],
-            obj[Infinity],
-            obj["Infinity"],
-            obj[-1/0],
-            obj[-Infinity],
-            obj["-Infinity"],
-            obj[null],
-            obj["null"]
-        );
-    }
-    expect: {
-        var obj = {
-            undefined: 1,
-            NaN: 2,
-            Infinity: 3,
-            "-Infinity": 4,
-            null: 5,
-        };
-        console.log(
-            obj[void 0],
-            obj[void 0],
-            obj["undefined"],
-            obj[0/0],
-            obj[NaN],
-            obj["NaN"],
-            obj[1/0],
-            obj[1/0],
-            obj["Infinity"],
-            obj[-1/0],
-            obj[-1/0],
-            obj["-Infinity"],
-            obj[null],
-            obj["null"]
-        );
-    }
-    expect_stdout: "1 1 1 2 2 2 3 3 3 4 4 4 5 5"
-}
-
-numeric_literal: {
-    mangle = {
-        properties: true,
-    }
-    beautify = {
-        beautify: true,
-    }
-    input: {
-        var obj = {
-            0: 0,
-            "-0": 1,
-            42: 2,
-            "42": 3,
-            0x25: 4,
-            "0x25": 5,
-            1E42: 6,
-            "1E42": 7,
-            "1e+42": 8,
-        };
-        console.log(obj[-0], obj[-""], obj["-0"]);
-        console.log(obj[42], obj["42"]);
-        console.log(obj[0x25], obj["0x25"], obj[37], obj["37"]);
-        console.log(obj[1E42], obj["1E42"], obj["1e+42"]);
-    }
-    expect_exact: [
-        'var obj = {',
-        '    0: 0,',
-        '    "-0": 1,',
-        '    42: 2,',
-        '    "42": 3,',
-        '    37: 4,',
-        '    o: 5,',
-        '    1e42: 6,',
-        '    b: 7,',
-        '    "1e+42": 8',
-        '};',
-        '',
-        'console.log(obj[-0], obj[-""], obj["-0"]);',
-        '',
-        'console.log(obj[42], obj["42"]);',
-        '',
-        'console.log(obj[37], obj["o"], obj[37], obj["37"]);',
-        '',
-        'console.log(obj[1e42], obj["b"], obj["1e+42"]);',
-    ]
-    expect_stdout: [
-        "0 0 1",
-        "3 3",
-        "4 5 4 4",
-        "8 7 8",
-    ]
-}
-
-identifier: {
-    mangle = {
-        properties: true,
-    }
-    input: {
-        var obj = {
-            abstract: 1,
-            boolean: 2,
-            byte: 3,
-            char: 4,
-            class: 5,
-            double: 6,
-            enum: 7,
-            export: 8,
-            extends: 9,
-            final: 10,
-            float: 11,
-            goto: 12,
-            implements: 13,
-            import: 14,
-            int: 15,
-            interface: 16,
-            let: 17,
-            long: 18,
-            native: 19,
-            package: 20,
-            private: 21,
-            protected: 22,
-            public: 23,
-            short: 24,
-            static: 25,
-            super: 26,
-            synchronized: 27,
-            this: 28,
-            throws: 29,
-            transient: 30,
-            volatile: 31,
-            yield: 32,
-            false: 33,
-            null: 34,
-            true: 35,
-            break: 36,
-            case: 37,
-            catch: 38,
-            const: 39,
-            continue: 40,
-            debugger: 41,
-            default: 42,
-            delete: 43,
-            do: 44,
-            else: 45,
-            finally: 46,
-            for: 47,
-            function: 48,
-            if: 49,
-            in: 50,
-            instanceof: 51,
-            new: 52,
-            return: 53,
-            switch: 54,
-            throw: 55,
-            try: 56,
-            typeof: 57,
-            var: 58,
-            void: 59,
-            while: 60,
-            with: 61,
-        };
-    }
-    expect: {
-        var obj = {
-            e: 1,
-            t: 2,
-            n: 3,
-            a: 4,
-            i: 5,
-            o: 6,
-            r: 7,
-            l: 8,
-            s: 9,
-            c: 10,
-            f: 11,
-            u: 12,
-            d: 13,
-            h: 14,
-            p: 15,
-            b: 16,
-            v: 17,
-            w: 18,
-            y: 19,
-            g: 20,
-            m: 21,
-            k: 22,
-            x: 23,
-            j: 24,
-            z: 25,
-            q: 26,
-            A: 27,
-            B: 28,
-            C: 29,
-            D: 30,
-            F: 31,
-            G: 32,
-            false: 33,
-            null: 34,
-            true: 35,
-            H: 36,
-            I: 37,
-            J: 38,
-            K: 39,
-            L: 40,
-            M: 41,
-            N: 42,
-            O: 43,
-            P: 44,
-            Q: 45,
-            R: 46,
-            S: 47,
-            T: 48,
-            U: 49,
-            V: 50,
-            W: 51,
-            X: 52,
-            Y: 53,
-            Z: 54,
-            $: 55,
-            _: 56,
-            ee: 57,
-            te: 58,
-            ne: 59,
-            ae: 60,
-            ie: 61,
-        };
-    }
-}

test/compress/issue-1787.js

@@ -1,16 +0,0 @@
-unary_prefix: {
-    options = {
-        evaluate: true,
-        inline: true,
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        console.log(function() {
-            var x = -(2 / 3);
-            return x;
-        }());
-    }
-    expect_exact: "console.log(-2/3);"
-    expect_stdout: true
-}

test/compress/issue-1833.js

@@ -1,134 +0,0 @@
-iife_for: {
-    options = {
-        negate_iife: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        function f() {
-            function g() {
-                L: for (;;) break L;
-            }
-            g();
-        }
-        f();
-    }
-    expect: {
-        !function() {
-            !function() {
-                L: for (;;) break L;
-            }();
-        }();
-    }
-}
-
-iife_for_in: {
-    options = {
-        negate_iife: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        function f() {
-            function g() {
-                L: for (var a in x) break L;
-            }
-            g();
-        }
-        f();
-    }
-    expect: {
-        !function() {
-            !function() {
-                L: for (var a in x) break L;
-            }();
-        }();
-    }
-}
-
-iife_do: {
-    options = {
-        negate_iife: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        function f() {
-            function g() {
-                L: do {
-                    break L;
-                } while (1);
-            }
-            g();
-        }
-        f();
-    }
-    expect: {
-        !function() {
-            !function() {
-                L: do {
-                    break L;
-                } while (1);
-            }();
-        }();
-    }
-}
-
-iife_while: {
-    options = {
-        negate_iife: true,
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        function f() {
-            function g() {
-                L: while (1) break L;
-            }
-            g();
-        }
-        f();
-    }
-    expect: {
-        !function() {
-            !function() {
-                L: while (1) break L;
-            }();
-        }();
-    }
-}
-
-label_do: {
-    options = {
-        evaluate: true,
-        loops: true,
-    }
-    input: {
-        L: do {
-            continue L;
-        } while (0);
-    }
-    expect: {
-        L: do {
-            continue L;
-        } while (0);
-    }
-}
-
-label_while: {
-    options = {
-        evaluate: true,
-        dead_code: true,
-        loops: true,
-    }
-    input: {
-        function f() {
-            L: while (0) continue L;
-        }
-    }
-    expect_exact: "function f(){L:;}"
-}

test/compress/issue-1943.js

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

test/compress/issue-203.js

@@ -0,0 +1,34 @@
+
+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,
+        ecma: 6
+    }
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        new Function("aa, [bb]", 'return aa;');
+        new Function("aa, {bb}", 'return aa;');
+        new Function("[[aa]], [{bb}]", 'return aa;');
+    }
+    expect: {
+        Function("a", "[b]", "return a");
+        Function("a", "{bb}", "return a");
+        Function("[[a]]", "[{bb}]", 'return a');
+    }
+}
+
+

test/compress/issue-208.js

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

test/compress/issue-281.js

@@ -1,493 +0,0 @@
-collapse_vars_constants: {
-    options = {
-        collapse_vars: true,
-        evaluate: true,
-        inline: true,
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        function f1(x) {
-            var a = 4, b = x.prop, c = 5, d = sideeffect1(), e = sideeffect2();
-            return b + (function() { return d - a * e - c; })();
-        }
-        function f2(x) {
-            var a = 4, b = x.prop, c = 5, not_used = sideeffect1(), e = sideeffect2();
-            return b + (function() { return -a * e - c; })();
-        }
-    }
-    expect: {
-        function f1(x) {
-            var b = x.prop, d = sideeffect1(), e = sideeffect2();
-            return b + (d - 4 * e - 5);
-        }
-        function f2(x) {
-            var b = x.prop;
-            sideeffect1();
-            return b + (-4 * sideeffect2() - 5);
-        }
-    }
-}
-
-modified: {
-    options = {
-        collapse_vars: true,
-        inline: true,
-        unused: true,
-    }
-    input: {
-        function f5(b) {
-            var a = function() {
-                return b;
-            }();
-            return b++ + a;
-        }
-        console.log(f5(1));
-    }
-    expect: {
-        function f5(b) {
-            var a = b;
-            return b++ + a;
-        }
-        console.log(f5(1));
-    }
-    expect_stdout: "2"
-}
-
-ref_scope: {
-    options = {
-        collapse_vars: true,
-        inline: true,
-        unused: true,
-    }
-    input: {
-        console.log(function() {
-            var a = 1, b = 2, c = 3;
-            var a = c++, b = b /= a;
-            return function() {
-                return a;
-            }() + b;
-        }());
-    }
-    expect: {
-        console.log(function() {
-            var a = 1, b = 2, c = 3;
-            b = b /= a = c++;
-            return a + b;
-        }());
-    }
-    expect_stdout: true
-}
-
-safe_undefined: {
-    options = {
-        conditionals: true,
-        if_return: true,
-        inline: true,
-        unsafe: false,
-        unused: true,
-    }
-    mangle = {}
-    input: {
-        var a, c;
-        console.log(function(undefined) {
-            return function() {
-                if (a)
-                    return b;
-                if (c)
-                    return d;
-            };
-        }(1)());
-    }
-    expect: {
-        var a, c;
-        console.log(a ? b : c ? d : void 0);
-    }
-    expect_stdout: true
-}
-
-negate_iife_3: {
-    options = {
-        conditionals: true,
-        expression: true,
-        inline: true,
-        negate_iife: true,
-    }
-    input: {
-        (function(){ return t })() ? console.log(true) : console.log(false);
-    }
-    expect: {
-        t ? console.log(true) : console.log(false);
-    }
-}
-
-negate_iife_3_off: {
-    options = {
-        conditionals: true,
-        expression: true,
-        inline: true,
-        negate_iife: false,
-    }
-    input: {
-        (function(){ return t })() ? console.log(true) : console.log(false);
-    }
-    expect: {
-        t ? console.log(true) : console.log(false);
-    }
-}
-
-negate_iife_4: {
-    options = {
-        conditionals: true,
-        expression: true,
-        inline: true,
-        negate_iife: true,
-        sequences: true,
-    }
-    input: {
-        (function(){ return t })() ? console.log(true) : console.log(false);
-        (function(){
-            console.log("something");
-        })();
-    }
-    expect: {
-        t ? console.log(true) : console.log(false), void console.log("something");
-    }
-}
-
-negate_iife_5: {
-    options = {
-        conditionals: true,
-        expression: true,
-        inline: true,
-        negate_iife: true,
-        sequences: true,
-    }
-    input: {
-        if ((function(){ return t })()) {
-            foo(true);
-        } else {
-            bar(false);
-        }
-        (function(){
-            console.log("something");
-        })();
-    }
-    expect: {
-        t ? foo(true) : bar(false), void console.log("something");
-    }
-}
-
-negate_iife_5_off: {
-    options = {
-        conditionals: true,
-        expression: true,
-        inline: true,
-        negate_iife: false,
-        sequences: true,
-    };
-    input: {
-        if ((function(){ return t })()) {
-            foo(true);
-        } else {
-            bar(false);
-        }
-        (function(){
-            console.log("something");
-        })();
-    }
-    expect: {
-        t ? foo(true) : bar(false), void console.log("something");
-    }
-}
-
-issue_1254_negate_iife_true: {
-    options = {
-        expression: true,
-        inline: true,
-        negate_iife: true,
-    }
-    input: {
-        (function() {
-            return function() {
-                console.log('test')
-            };
-        })()();
-    }
-    expect_exact: 'void console.log("test");'
-    expect_stdout: true
-}
-
-issue_1254_negate_iife_nested: {
-    options = {
-        expression: true,
-        inline: true,
-        negate_iife: true,
-    }
-    input: {
-        (function() {
-            return function() {
-                console.log('test')
-            };
-        })()()()()();
-    }
-    expect_exact: '(void console.log("test"))()()();'
-}
-
-negate_iife_issue_1073: {
-    options = {
-        conditionals: true,
-        evaluate: true,
-        inline: true,
-        negate_iife: true,
-        reduce_vars: true,
-        sequences: true,
-        unused: true,
-    };
-    input: {
-        new (function(a) {
-            return function Foo() {
-                this.x = a;
-                console.log(this);
-            };
-        }(7))();
-    }
-    expect: {
-        new function() {
-            this.x = 7,
-            console.log(this);
-        }();
-    }
-    expect_stdout: true
-}
-
-issue_1288_side_effects: {
-    options = {
-        conditionals: true,
-        evaluate: true,
-        inline: true,
-        negate_iife: true,
-        reduce_vars: true,
-        side_effects: true,
-        unused: true,
-    };
-    input: {
-        if (w) ;
-        else {
-            (function f() {})();
-        }
-        if (!x) {
-            (function() {
-                x = {};
-            })();
-        }
-        if (y)
-            (function() {})();
-        else
-            (function(z) {
-                return z;
-            })(0);
-    }
-    expect: {
-        w;
-        x || (x = {});
-        y;
-    }
-}
-
-inner_var_for_in_1: {
-    options = {
-        evaluate: true,
-        inline: true,
-        reduce_vars: true,
-    }
-    input: {
-        function f() {
-            var a = 1, b = 2;
-            for (b in (function() {
-                return x(a, b, c);
-            })()) {
-                var c = 3, d = 4;
-                x(a, b, c, d);
-            }
-            x(a, b, c, d);
-        }
-    }
-    expect: {
-        function f() {
-            var a = 1, b = 2;
-            for (b in x(1, b, c)) {
-                var c = 3, d = 4;
-                x(1, b, c, d);
-            }
-            x(1, b, c, d);
-        }
-    }
-}
-
-issue_1595_3: {
-    options = {
-        evaluate: true,
-        inline: true,
-        passes: 2,
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        (function f(a) {
-            return g(a + 1);
-        })(2);
-    }
-    expect: {
-        g(3);
-    }
-}
-
-issue_1758: {
-    options = {
-        inline: true,
-        sequences: true,
-        side_effects: true,
-    }
-    input: {
-        console.log(function(c) {
-            var undefined = 42;
-            return function() {
-                c--;
-                c--, c.toString();
-                return;
-            }();
-        }());
-    }
-    expect: {
-        console.log(function(c) {
-            var undefined = 42;
-            return c--, c--, void c.toString();
-        }());
-    }
-    expect_stdout: "undefined"
-}
-wrap_iife: {
-    options = {
-        inline: true,
-        negate_iife: false,
-    }
-    beautify = {
-        wrap_iife: true,
-    }
-    input: {
-        (function() {
-            return function() {
-                console.log('test')
-            };
-        })()();
-    }
-    expect_exact: 'void console.log("test");'
-}
-
-wrap_iife_in_expression: {
-    options = {
-        inline: true,
-        negate_iife: false,
-    }
-    beautify = {
-        wrap_iife: true,
-    }
-    input: {
-        foo = (function () {
-            return bar();
-        })();
-    }
-    expect_exact: 'foo=bar();'
-}
-
-wrap_iife_in_return_call: {
-    options = {
-        inline: true,
-        negate_iife: false,
-    }
-    beautify = {
-        wrap_iife: true,
-    }
-    input: {
-        (function() {
-            return (function() {
-                console.log('test')
-            })();
-        })()();
-    }
-    expect_exact: '(void console.log("test"))();'
-}
-
-pure_annotation_1: {
-    options = {
-        inline: true,
-        side_effects: true,
-    }
-    input: {
-        /*@__PURE__*/(function() {
-            console.log("hello");
-        }());
-    }
-    expect_exact: ""
-}
-
-pure_annotation_2: {
-    options = {
-        collapse_vars: true,
-        inline: true,
-        side_effects: true,
-    }
-    input: {
-        /*@__PURE__*/(function(n) {
-            console.log("hello", n);
-        }(42));
-    }
-    expect_exact: ""
-}
-
-drop_fargs: {
-    options = {
-        cascade: true,
-        inline: true,
-        keep_fargs: false,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        var a = 1;
-        !function(a_1) {
-            a++;
-        }(a++ + (a && a.var));
-        console.log(a);
-    }
-    expect: {
-        var a = 1;
-        ++a && a.var, a++;
-        console.log(a);
-    }
-    expect_stdout: "3"
-}
-
-keep_fargs: {
-    options = {
-        cascade: true,
-        inline: true,
-        keep_fargs: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        var a = 1;
-        !function(a_1) {
-            a++;
-        }(a++ + (a && a.var));
-        console.log(a);
-    }
-    expect: {
-        var a = 1;
-        ++a && a.var, a++;
-        console.log(a);
-    }
-    expect_stdout: "3"
-}

test/compress/issue-597.js

@@ -6,7 +6,7 @@ NaN_and_Infinity_must_have_parens: {
     }
     expect: {
         (1/0).toString();
-        NaN.toString();
+        NaN.toString();         // transformation to 0/0 dropped
     }
 }
 
@@ -23,135 +23,3 @@ NaN_and_Infinity_should_not_be_replaced_when_they_are_redefined: {
         NaN.toString();
     }
 }
-
-NaN_and_Infinity_must_have_parens_evaluate: {
-    options = {
-        evaluate: true,
-    }
-    input: {
-        (123456789 / 0).toString();
-        (+"foo").toString();
-    }
-    expect: {
-        (1/0).toString();
-        NaN.toString();
-    }
-}
-
-NaN_and_Infinity_should_not_be_replaced_when_they_are_redefined_evaluate: {
-    options = {
-        evaluate: true,
-    }
-    input: {
-        var Infinity, NaN;
-        (123456789 / 0).toString();
-        (+"foo").toString();
-    }
-    expect: {
-        var Infinity, NaN;
-        (1/0).toString();
-        (0/0).toString();
-    }
-}
-
-beautify_off_1: {
-    options = {
-        evaluate: true,
-    }
-    beautify = {
-        beautify: false,
-    }
-    input: {
-        var NaN;
-        console.log(
-            null,
-            undefined,
-            Infinity,
-            NaN,
-            Infinity * undefined,
-            Infinity.toString(),
-            NaN.toString(),
-            (Infinity * undefined).toString()
-        );
-    }
-    expect_exact: "var NaN;console.log(null,void 0,1/0,NaN,0/0,(1/0).toString(),NaN.toString(),(0/0).toString());"
-    expect_stdout: true
-}
-
-beautify_off_2: {
-    options = {
-        evaluate: true,
-    }
-    beautify = {
-        beautify: false,
-    }
-    input: {
-        console.log(
-            null.toString(),
-            undefined.toString()
-        );
-    }
-    expect_exact: "console.log(null.toString(),(void 0).toString());"
-}
-
-beautify_on_1: {
-    options = {
-        evaluate: true,
-    }
-    beautify = {
-        beautify: true,
-    }
-    input: {
-        var NaN;
-        console.log(
-            null,
-            undefined,
-            Infinity,
-            NaN,
-            Infinity * undefined,
-            Infinity.toString(),
-            NaN.toString(),
-            (Infinity * undefined).toString()
-        );
-    }
-    expect_exact: [
-        "var NaN;",
-        "",
-        "console.log(null, void 0, 1 / 0, NaN, 0 / 0, (1 / 0).toString(), NaN.toString(), (0 / 0).toString());",
-    ]
-    expect_stdout: true
-}
-
-beautify_on_2: {
-    options = {
-        evaluate: true,
-    }
-    beautify = {
-        beautify: true,
-    }
-    input: {
-        console.log(
-            null.toString(),
-            undefined.toString()
-        );
-    }
-    expect_exact: "console.log(null.toString(), (void 0).toString());"
-}
-
-issue_1724: {
-    input: {
-        var a = 0;
-        ++a % Infinity | Infinity ? a++ : 0;
-        console.log(a);
-    }
-    expect_exact: "var a=0;++a%(1/0)|1/0?a++:0;console.log(a);"
-    expect_stdout: "2"
-}
-
-issue_1725: {
-    input: {
-        ([].length === 0) % Infinity ? console.log("PASS") : console.log("FAIL");
-    }
-    expect_exact: '(0===[].length)%(1/0)?console.log("PASS"):console.log("FAIL");'
-    expect_stdout: "PASS"
-}

test/compress/issue-640.js

@@ -159,7 +159,7 @@ negate_iife_4: {
         })();
     }
     expect: {
-        !function(){ return t }() ? console.log(false) : console.log(true), function(){
+        (function(){ return t })() ? console.log(true) : console.log(false), function(){
             console.log("something");
         }();
     }
@@ -183,7 +183,7 @@ negate_iife_5: {
         })();
     }
     expect: {
-        !function(){ return t }() ? bar(false) : foo(true), function(){
+        (function(){ return t })() ? foo(true) : bar(false), function(){
             console.log("something");
         }();
     }
@@ -207,7 +207,7 @@ negate_iife_5_off: {
         })();
     }
     expect: {
-        !function(){ return t }() ? bar(false) : foo(true), function(){
+        (function(){ return t })() ? foo(true) : bar(false), function(){
             console.log("something");
         }();
     }

test/compress/issue-747.js

@@ -1,45 +1,37 @@
 dont_reuse_prop: {
-    mangle = {
-        properties: {
-            regex: /asd/,
-        },
-    }
+    mangle_props = {
+        regex: /asd/
+    };
+
     input: {
-        "aaaaaaaaaabbbbb";
         var obj = {};
         obj.a = 123;
         obj.asd = 256;
         console.log(obj.a);
     }
     expect: {
-        "aaaaaaaaaabbbbb";
         var obj = {};
         obj.a = 123;
         obj.b = 256;
         console.log(obj.a);
     }
-    expect_stdout: "123"
 }
 
 unmangleable_props_should_always_be_reserved: {
-    mangle = {
-        properties: {
-            regex: /asd/,
-        },
-    }
+    mangle_props = {
+        regex: /asd/
+    };
+
     input: {
-        "aaaaaaaaaabbbbb";
         var obj = {};
         obj.asd = 256;
         obj.a = 123;
         console.log(obj.a);
     }
     expect: {
-        "aaaaaaaaaabbbbb";
         var obj = {};
         obj.b = 256;
         obj.a = 123;
         console.log(obj.a);
     }
-    expect_stdout: "123"
-}
+}

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/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

@@ -146,6 +146,50 @@ parse_do_while_without_semicolon: {
     }
 }
 
+
+keep_collapse_const_in_own_block_scope: {
+    options = {
+        join_vars: true,
+        loops: true
+    }
+    input: {
+        var i=2;
+        const c=5;
+        while(i--)
+            console.log(i);
+        console.log(c);
+    }
+    expect: {
+        var i=2;
+        const c=5;
+        for(;i--;)
+            console.log(i);
+        console.log(c);
+    }
+    expect_stdout: true
+}
+
+keep_collapse_const_in_own_block_scope_2: {
+    options = {
+        join_vars: true,
+        loops: true
+    }
+    input: {
+        const c=5;
+        var i=2; // Moves to loop, while it did not in previous test
+        while(i--)
+            console.log(i);
+        console.log(c);
+    }
+    expect: {
+        const c=5;
+        for(var i=2;i--;)
+            console.log(i);
+        console.log(c);
+    }
+    expect_stdout: true
+}
+
 evaluate: {
     options = {
         loops: true,
@@ -171,7 +215,8 @@ evaluate: {
             a();
         for(;;)
             c();
-        d();
+        // rule disabled due to issue_1532
+        do d(); while (false);
     }
 }
 
@@ -201,7 +246,7 @@ issue_1532: {
 issue_186: {
     beautify = {
         beautify: false,
-        ie8: false,
+        screw_ie8: true,
     }
     input: {
         var x = 3;
@@ -220,7 +265,7 @@ issue_186: {
 issue_186_ie8: {
     beautify = {
         beautify: false,
-        ie8: true,
+        screw_ie8: false,
     }
     input: {
         var x = 3;
@@ -239,7 +284,7 @@ issue_186_ie8: {
 issue_186_beautify: {
     beautify = {
         beautify: true,
-        ie8: false,
+        screw_ie8: true,
     }
     input: {
         var x = 3;
@@ -266,7 +311,7 @@ issue_186_beautify: {
 issue_186_beautify_ie8: {
     beautify = {
         beautify: true,
-        ie8: true,
+        screw_ie8: false,
     }
     input: {
         var x = 3;
@@ -296,7 +341,7 @@ issue_186_bracketize: {
     beautify = {
         beautify: false,
         bracketize: true,
-        ie8: false,
+        screw_ie8: true,
     }
     input: {
         var x = 3;
@@ -316,7 +361,7 @@ issue_186_bracketize_ie8: {
     beautify = {
         beautify: false,
         bracketize: true,
-        ie8: true,
+        screw_ie8: false,
     }
     input: {
         var x = 3;
@@ -336,7 +381,7 @@ issue_186_beautify_bracketize: {
     beautify = {
         beautify: true,
         bracketize: true,
-        ie8: false,
+        screw_ie8: true,
     }
     input: {
         var x = 3;
@@ -368,7 +413,7 @@ issue_186_beautify_bracketize_ie8: {
     beautify = {
         beautify: true,
         bracketize: true,
-        ie8: true,
+        screw_ie8: false,
     }
     input: {
         var x = 3;
@@ -413,40 +458,3 @@ issue_1648: {
     }
     expect_exact: "function f(){for(x();1;);}"
 }
-
-do_switch: {
-    options = {
-        evaluate: true,
-        loops: true,
-    }
-    input: {
-        do {
-            switch (a) {
-              case b:
-                continue;
-            }
-        } while (false);
-    }
-    expect: {
-        do {
-            switch (a) {
-              case b:
-                continue;
-            }
-        } while (false);
-    }
-}
-
-in_parenthesis_1: {
-    input: {
-        for (("foo" in {});0;);
-    }
-    expect_exact: 'for(("foo"in{});0;);'
-}
-
-in_parenthesis_2: {
-    input: {
-        for ((function(){ "foo" in {}; });0;);
-    }
-    expect_exact: 'for(function(){"foo"in{}};0;);'
-}

test/compress/negate-iife.js

@@ -22,25 +22,27 @@ negate_iife_1_off: {
 
 negate_iife_2: {
     options = {
-        inline: true,
-        negate_iife: true,
+        negate_iife: true
     };
     input: {
+        (function(){ return {} })().x = 10; // should not transform this one
+    }
+    expect: {
         (function(){ return {} })().x = 10;
     }
-    expect_exact: "({}).x=10;"
 }
 
 negate_iife_2_side_effects: {
     options = {
-        inline: true,
         negate_iife: true,
         side_effects: true,
     }
     input: {
+        (function(){ return {} })().x = 10; // should not transform this one
+    }
+    expect: {
         (function(){ return {} })().x = 10;
     }
-    expect_exact: "({}).x=10;"
 }
 
 negate_iife_3: {
@@ -60,7 +62,6 @@ negate_iife_3_evaluate: {
     options = {
         conditionals: true,
         evaluate: true,
-        inline: true,
         negate_iife: true,
     }
     input: {
@@ -103,7 +104,6 @@ negate_iife_3_off_evaluate: {
     options = {
         conditionals: true,
         evaluate: true,
-        inline: true,
         negate_iife: false,
     }
     input: {

test/compress/new.js

@@ -83,18 +83,18 @@ new_with_unary_prefix: {
     expect_exact: 'var bar=(+new Date).toString(32);';
 }
 
-dot_parenthesis_1: {
-    input: {
-        console.log(new (Math.random().constructor) instanceof Number);
+new_with_assignement_expression: {
+    options = {
+        evaluate: true
     }
-    expect_exact: "console.log(new(Math.random().constructor)instanceof Number);"
-    expect_stdout: "true"
-}
-
-dot_parenthesis_2: {
     input: {
-        console.log(typeof new function(){Math.random()}.constructor);
+        var a;
+        new x(a = 5 * 2, b = [1, 2, 3], c = {a: "a", b: "b", cd: "c" + "d"});
+        new y([a, b] = [3, 4]);
+    }
+    expect: {
+        var a;
+        new x(a = 10, b = [1, 2, 3], c = {a: "a", b: "b", cd: "cd"});
+        new y([a, b] = [3, 4]);
     }
-    expect_exact: "console.log(typeof new function(){Math.random()}.constructor);"
-    expect_stdout: "function"
 }

test/compress/node_version.js

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

test/compress/numbers.js

@@ -168,37 +168,3 @@ issue_1710: {
     }
     expect_stdout: true
 }
-
-unary_binary_parenthesis: {
-    input: {
-        var v = [ 0, 1, NaN, Infinity, null, undefined, true, false, "", "foo", /foo/ ];
-        v.forEach(function(x) {
-            v.forEach(function(y) {
-                console.log(
-                    +(x*y),
-                    +(x/y),
-                    +(x%y),
-                    -(x*y),
-                    -(x/y),
-                    -(x%y)
-                );
-            });
-        });
-    }
-    expect: {
-        var v = [ 0, 1, NaN, 1/0, null, void 0, true, false, "", "foo", /foo/ ];
-        v.forEach(function(x) {
-            v.forEach(function(y) {
-                console.log(
-                    +x*y,
-                    +x/y,
-                    +x%y,
-                    -x*y,
-                    -x/y,
-                    -x%y
-                );
-            });
-        });
-    }
-    expect_stdout: true
-}

test/compress/object.js

@@ -0,0 +1,512 @@
+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: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        x = {
+            foo(a, b) {
+                return x;
+            }
+        }
+        y = {
+            foo([{a}]) {
+                return a;
+            },
+            bar(){}
+        }
+    }
+    expect_exact: "x={foo(a,b){return x}};y={foo([{a}]){return a},bar(){}};"
+}
+
+concise_methods_with_computed_property: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        var foo = {
+            [Symbol.iterator]() {
+                return { /* stuff */ }
+            },
+            [1 + 2]() {
+                return 3;
+            },
+            ["1" + "4"]() {
+                return 14;
+            }
+        }
+    }
+    expect: {
+        var foo = {
+            [Symbol.iterator]() {
+                return { /* stuff */ }
+            },
+            [3]() {
+                return 3;
+            },
+            ["14"]() {
+                return 14;
+            }
+        }
+    }
+}
+
+concise_methods_with_computed_property2: {
+    options = {
+        evaluate: true
+    }
+    input: {
+        var foo = {
+            [[1]](){
+                return "success";
+            }
+        };
+        doSomething(foo[[1]]());
+    }
+    expect_exact: 'var foo={[[1]](){return"success"}};doSomething(foo[[1]]());'
+}
+
+concise_methods_with_various_property_names: {
+    input: {
+        var get = "bar";
+        var a = {
+            bar() {
+                return this.get;
+            },
+            5() {
+                return "five";
+            },
+            0xf55() {
+                return "f five five";
+            },
+            "five"() {
+                return 5;
+            },
+            0b1010(value) {
+                this._ten = value;
+            }
+        };
+    }
+    expect: {
+        var get = "bar";
+        var a = {
+            bar() {
+                return this.get;
+            },
+            5() {
+                return "five";
+            },
+            0xf55() {
+                return "f five five";
+            },
+            "five"() {
+                return 5;
+            },
+            0b1010(value) {
+                this._ten = value;
+            }
+        };
+    }
+}
+
+concise_methods_and_mangle_props: {
+    mangle_props = {
+        regex: /_/
+    };
+    input: {
+        function x() {
+            obj = {
+                _foo() { return 1; }
+            }
+        }
+    }
+    expect: {
+        function x() {
+            obj = {
+                a() { return 1; }
+            }
+        }
+    }
+}
+
+concise_generators: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        x = {
+            *foo(a, b) {
+                return x;
+            }
+        }
+        y = {
+            *foo([{a}]) {
+                yield a;
+            },
+            bar(){}
+        }
+    }
+    expect_exact: "x={*foo(a,b){return x}};y={*foo([{a}]){yield a},bar(){}};"
+}
+
+concise_methods_and_keyword_names: {
+    input: {
+        x = {
+            catch() {},
+            throw() {}
+        }
+    }
+    expect: {
+        x={catch(){},throw(){}};
+    }
+}
+
+getter_setter_with_computed_value: {
+    input: {
+        class C {
+            get ['a']() {
+                return 'A';
+            }
+            set ['a'](value) {
+                do_something(a);
+            }
+        }
+        var x = {
+            get [a.b]() {
+                return 42;
+            }
+        };
+        class MyArray extends Array {
+            get [Symbol.species]() {
+                return Array;
+            }
+        }
+    }
+    expect_exact: 'class C{get["a"](){return"A"}set["a"](value){do_something(a)}}var x={get[a.b](){return 42}};class MyArray extends Array{get[Symbol.species](){return Array}}'
+}
+
+property_with_operator_value: {
+    input: {
+        var foo = {
+            "*": 1,
+            get "*"() {
+                return 2;
+            },
+            *"*"() {
+                return 3;
+            },
+            "%": 1,
+            get "%"() {
+                return 2;
+            },
+            *"%"() {
+                return 3;
+            }
+        }
+        class bar {
+            get "*"() {
+                return 1
+            }
+            *"*"() {
+                return 2;
+            }
+            get "%"() {
+                return 1
+            }
+            *"%"() {
+                return 2;
+            }
+        }
+    }
+    expect_exact: 'var foo={"*":1,get"*"(){return 2},*"*"(){return 3},"%":1,get"%"(){return 2},*"%"(){return 3}};class bar{get"*"(){return 1}*"*"(){return 2}get"%"(){return 1}*"%"(){return 2}}'
+}
+
+property_with_unprintable: {
+    input: {
+        var foo = {
+            "\x00\x01": "foo",
+            get "\x00\x01"() {
+                return "bar";
+            },
+            set "\x00\x01"(foo) {
+                save(foo);
+            },
+            *"\x00\x01"() {
+                return "foobar";
+            }
+        }
+        class bar {
+            get "\x00\x01"() {
+                return "bar"
+            }
+            set "\x00\x01"(foo) {
+                save(foo);
+            }
+            *"\x00\x01"() {
+                return "foobar";
+            }
+        }
+    }
+    expect_exact: 'var foo={"\\0\x01":"foo",get"\\0\x01"(){return"bar"},set"\\0\x01"(foo){save(foo)},*"\\0\x01"(){return"foobar"}};class bar{get"\\0\x01"(){return"bar"}set"\\0\x01"(foo){save(foo)}*"\\0\x01"(){return"foobar"}}'
+}
+
+property_with_unprintable_ascii_only: {
+    beautify = {
+        ascii_only: true,
+    }
+    input: {
+        var foo = {
+            "\x00\x01": "foo",
+            get "\x00\x01"() {
+                return "bar";
+            },
+            set "\x00\x01"(foo) {
+                save(foo);
+            },
+            *"\x00\x01"() {
+                return "foobar";
+            }
+        }
+        class bar {
+            get "\x00\x01"() {
+                return "bar"
+            }
+            set "\x00\x01"(foo) {
+                save(foo);
+            }
+            *"\x00\x01"() {
+                return "foobar";
+            }
+        }
+    }
+    expect_exact: 'var foo={"\\0\\x01":"foo",get"\\0\\x01"(){return"bar"},set"\\0\\x01"(foo){save(foo)},*"\\0\\x01"(){return"foobar"}};class bar{get"\\0\\x01"(){return"bar"}set"\\0\\x01"(foo){save(foo)}*"\\0\\x01"(){return"foobar"}}'
+}
+
+property_with_unprintable_ascii_only_static: {
+    beautify = {
+        ascii_only: true
+    }
+    input: {
+        class foo {
+            static get "\x02\x03"() {
+                return "bar";
+            }
+            static set "\x04\x05"(foo) {
+                save(foo);
+            }
+        }
+    }
+    expect_exact: 'class foo{static get"\\x02\\x03"(){return"bar"}static set"\\x04\\x05"(foo){save(foo)}}'
+}
+
+methods_and_getters_with_keep_quoted_props_enabled: {
+    beautify = {
+        quote_style: 3,
+        keep_quoted_props: true,
+    }
+    input: {
+        var obj = {
+            a() {},
+            "b"() {},
+            get c() { return "c"},
+            get "d"() { return "d"},
+            set e(a) { doSomething(a); },
+            set f(a) { doSomething(b); }
+        }
+    }
+    expect_exact: 'var obj={a(){},"b"(){},get c(){return"c"},get"d"(){return"d"},set e(a){doSomething(a)},set f(a){doSomething(b)}};'
+}
+
+allow_assignments_to_property_values: {
+    input: {
+        var foo = {123: foo = 123} = {foo: "456"};
+    }
+    expect: {
+        var foo = {123: foo = 123} = {foo: "456"};
+    }
+}
+
+variable_as_computed_property: {
+    input: {
+        function getLine(header) {
+            return {
+                [header]: {}
+            };
+        }
+    }
+    expect_exact: "function getLine(header){return{[header]:{}}}"
+}

test/compress/parameters.js

@@ -0,0 +1,180 @@
+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=>b;a=>\"lel\";"
+}
+
+arrow_return: {
+    input: {
+        () => {};
+        () => { return; };
+        a => { return 1; }
+        a => { return -b }
+        a => { return b; var b; }
+        (x, y) => { return x - y; }
+    }
+    expect_exact: "()=>{};()=>{};a=>1;a=>-b;a=>{return b;var b};(x,y)=>x-y;"
+}
+
+regression_arrow_functions_and_hoist: {
+    options = {
+        hoist_vars: true,
+        hoist_funs: true
+    }
+    input: {
+        (a) => b;
+    }
+    expect_exact: "a=>b;"
+}
+
+regression_assign_arrow_functions: {
+    input: {
+        oninstall = e => false;
+        oninstall = () => false;
+    }
+    expect: {
+        oninstall=e=>false;
+        oninstall=()=>false;
+    }
+}
+
+destructuring_arguments_1: {
+    input: {
+        (function ( a ) { });
+        (function ( [ a ] ) { });
+        (function ( [ a, b ] ) { });
+        (function ( [ [ a ] ] ) { });
+        (function ( [ [ a, b ] ] ) { });
+        (function ( [ a, [ b ] ] ) { });
+        (function ( [ [ b ], a ] ) { });
+
+        (function ( { a } ) { });
+        (function ( { a, b } ) { });
+
+        (function ( [ { a } ] ) { });
+        (function ( [ { a, b } ] ) { });
+        (function ( [ a, { b } ] ) { });
+        (function ( [ { b }, a ] ) { });
+
+        ( [ a ] ) => { };
+        ( [ a, b ] ) => { };
+
+        ( { a } ) => { };
+        ( { a, b, c, d, e } ) => { };
+
+        ( [ a ] ) => b;
+        ( [ a, b ] ) => c;
+
+        ( { a } ) => b;
+        ( { a, b } ) => c;
+    }
+    expect: {
+        (function(a){});
+        (function([a]){});
+        (function([a,b]){});
+        (function([[a]]){});
+        (function([[a,b]]){});
+        (function([a,[b]]){});
+        (function([[b],a]){});
+
+        (function({a}){});
+        (function({a,b}){});
+
+        (function([{a}]){});
+        (function([{a,b}]){});
+        (function([a,{b}]){});
+        (function([{b},a]){});
+
+        ([a])=>{};
+        ([a,b])=>{};
+
+        ({a})=>{};
+        ({a,b,c,d,e})=>{};
+
+        ([a])=>b;
+        ([a,b])=>c;
+
+        ({a})=>b;
+        ({a,b})=>c;
+    }
+}
+
+destructuring_arguments_2: {
+    input: {
+        (function([]) {});
+        (function({}) {});
+        (function([,,,,,]) {});
+        (function ([a, {b: c}]) {});
+        (function ([...args]) {});
+        (function ({x,}) {});
+        class a { *method({ [thrower()]: x } = {}) {}};
+        (function(a, b, c, d, [{e: [...f]}]){})(1, 2, 3, 4, [{e: [1, 2, 3]}]);
+    }
+    expect: {
+        (function([]) {});
+        (function({}) {});
+        (function([,,,,,]) {});
+        (function ([a, {b: c}]) {});
+        (function ([...args]) {});
+        (function ({x,}) {});
+        class a { *method({ [thrower()]: x } = {}) {}};
+        (function(a, b, c, d, [{e: [...f]}]){})(1, 2, 3, 4, [{e: [1, 2, 3]}]);
+    }
+}
+
+destructuring_arguments_3: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        function fn3({x: {y: {z: {} = 42}}}) {}
+        const { 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: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        function x(a = 6) { }
+        function x(a = (6 + 5)) { }
+        function x({ foo } = {}, [ bar ] = [ 1 ]) { }
+    }
+    expect_exact: "function x(a=6){}function x(a=6+5){}function x({foo}={},[bar]=[1]){}"
+}
+
+default_values_in_destructurings: {
+    beautify = {
+        ecma: 6
+    }
+    input: {
+        function x({a=(4), b}) {}
+        function x([b, c=(12)]) {}
+        var { x = (6), y } = x;
+        var [ x, y = (6) ] = x;
+    }
+    expect_exact: "function x({a=4,b}){}function x([b,c=12]){}var{x=6,y}=x;var[x,y=6]=x;"
+}
+
+accept_duplicated_parameters_in_non_strict_without_spread_or_default_assignment: {
+    input: {
+        function a(b, b){}
+        function b({c: test, c: test}){}
+    }
+    expect: {
+        function a(b, b){}
+        function b({c: test, c: test}){}
+    }
+}

test/compress/properties.js

@@ -13,10 +13,8 @@ keep_properties: {
 dot_properties: {
     options = {
         properties: true,
-    }
-    beautify = {
-        ie8: true,
-    }
+        screw_ie8: false
+    };
     input: {
         a["foo"] = "bar";
         a["if"] = "if";
@@ -38,10 +36,8 @@ dot_properties: {
 dot_properties_es5: {
     options = {
         properties: true,
-    }
-    beautify = {
-        ie8: false,
-    }
+        screw_ie8: true
+    };
     input: {
         a["foo"] = "bar";
         a["if"] = "if";
@@ -128,11 +124,9 @@ evaluate_string_length: {
 }
 
 mangle_properties: {
-    mangle = {
-        properties: {
-            keep_quoted: false,
-        },
-    }
+    mangle_props = {
+        ignore_quoted: false
+    };
     input: {
         a["foo"] = "bar";
         a.color = "red";
@@ -143,9 +137,9 @@ mangle_properties: {
     expect: {
         a["a"] = "bar";
         a.b = "red";
-        x = {o: 10};
-        a.r(x.o, a.a);
-        a['r']({b: "blue", a: "baz"});
+        x = {c: 10};
+        a.d(x.c, a.a);
+        a['d']({b: "blue", a: "baz"});
     }
 }
 
@@ -153,10 +147,9 @@ mangle_unquoted_properties: {
     options = {
         properties: false
     }
-    mangle = {
-        properties: {
-            keep_quoted: true,
-        },
+    mangle_props = {
+        ignore_quoted: true,
+        reserved: []
     }
     beautify = {
         beautify: false,
@@ -185,26 +178,24 @@ mangle_unquoted_properties: {
         function f1() {
             a["foo"] = "bar";
             a.color = "red";
-            a.r = 2;
-            x = {"bar": 10, b: 7};
-            a.b = 9;
+            a.b = 2;
+            x = {"bar": 10, c: 7};
+            a.c = 9;
         }
         function f2() {
             a.foo = "bar";
             a['color'] = "red";
-            x = {bar: 10, b: 7};
-            a.b = 9;
-            a.r = 3;
+            x = {bar: 10, c: 7};
+            a.c = 9;
+            a.b = 3;
         }
     }
 }
 
 mangle_debug: {
-    mangle = {
-        properties: {
-            debug: "",
-        },
-    }
+    mangle_props = {
+        debug: ""
+    };
     input: {
         a.foo = "bar";
         x = { baz: "ban" };
@@ -216,11 +207,9 @@ mangle_debug: {
 }
 
 mangle_debug_true: {
-    mangle = {
-        properties: {
-            debug: true,
-        },
-    }
+    mangle_props = {
+        debug: true
+    };
     input: {
         a.foo = "bar";
         x = { baz: "ban" };
@@ -232,11 +221,9 @@ mangle_debug_true: {
 }
 
 mangle_debug_suffix: {
-    mangle = {
-        properties: {
-            debug: "XYZ",
-        },
-    }
+    mangle_props = {
+        debug: "XYZ"
+    };
     input: {
         a.foo = "bar";
         x = { baz: "ban" };
@@ -247,16 +234,14 @@ mangle_debug_suffix: {
     }
 }
 
-mangle_debug_suffix_keep_quoted: {
+mangle_debug_suffix_ignore_quoted: {
     options = {
         properties: false
     }
-    mangle = {
-        properties: {
-            debug: "XYZ",
-            keep_quoted: true,
-            reserved: [],
-        },
+    mangle_props = {
+        ignore_quoted: true,
+        debug: "XYZ",
+        reserved: []
     }
     beautify = {
         beautify: false,
@@ -571,236 +556,3 @@ native_prototype: {
         "".indexOf.call(e, "bar");
     }
 }
-
-accessor_boolean: {
-    input: {
-        var a = 1;
-        var b = {
-            get true() {
-                return a;
-            },
-            set false(c) {
-                a = c;
-            }
-        };
-        console.log(b.true, b.false = 2, b.true);
-    }
-    expect_exact: 'var a=1;var b={get true(){return a},set false(c){a=c}};console.log(b.true,b.false=2,b.true);'
-    expect_stdout: "1 2 2"
-}
-
-accessor_get_set: {
-    input: {
-        var a = 1;
-        var b = {
-            get set() {
-                return a;
-            },
-            set get(c) {
-                a = c;
-            }
-        };
-        console.log(b.set, b.get = 2, b.set);
-    }
-    expect_exact: 'var a=1;var b={get set(){return a},set get(c){a=c}};console.log(b.set,b.get=2,b.set);'
-    expect_stdout: "1 2 2"
-}
-
-accessor_null_undefined: {
-    input: {
-        var a = 1;
-        var b = {
-            get null() {
-                return a;
-            },
-            set undefined(c) {
-                a = c;
-            }
-        };
-        console.log(b.null, b.undefined = 2, b.null);
-    }
-    expect_exact: 'var a=1;var b={get null(){return a},set undefined(c){a=c}};console.log(b.null,b.undefined=2,b.null);'
-    expect_stdout: "1 2 2"
-}
-
-accessor_number: {
-    input: {
-        var a = 1;
-        var b = {
-            get 42() {
-                return a;
-            },
-            set 42(c) {
-                a = c;
-            }
-        };
-        console.log(b[42], b[42] = 2, b[42]);
-    }
-    expect_exact: 'var a=1;var b={get 42(){return a},set 42(c){a=c}};console.log(b[42],b[42]=2,b[42]);'
-    expect_stdout: "1 2 2"
-}
-
-accessor_string: {
-    input: {
-        var a = 1;
-        var b = {
-            get "a-b"() {
-                return a;
-            },
-            set "a-b"(c) {
-                a = c;
-            }
-        };
-        console.log(b["a-b"], b["a-b"] = 2, b["a-b"]);
-    }
-    expect_exact: 'var a=1;var b={get"a-b"(){return a},set"a-b"(c){a=c}};console.log(b["a-b"],b["a-b"]=2,b["a-b"]);'
-    expect_stdout: "1 2 2"
-}
-
-accessor_this: {
-    input: {
-        var a = 1;
-        var b = {
-            get this() {
-                return a;
-            },
-            set this(c) {
-                a = c;
-            }
-        };
-        console.log(b.this, b.this = 2, b.this);
-    }
-    expect_exact: 'var a=1;var b={get this(){return a},set this(c){a=c}};console.log(b.this,b.this=2,b.this);'
-    expect_stdout: "1 2 2"
-}
-
-issue_2208_1: {
-    options = {
-        inline: true,
-        side_effects: true,
-        unsafe: true,
-    }
-    input: {
-        console.log({
-            p: function() {
-                return 42;
-            }
-        }.p());
-    }
-    expect: {
-        console.log(42);
-    }
-    expect_stdout: "42"
-}
-
-issue_2208_2: {
-    options = {
-        inline: true,
-        side_effects: true,
-        unsafe: true,
-    }
-    input: {
-        console.log({
-            a: 42,
-            p: function() {
-                return this.a;
-            }
-        }.p());
-    }
-    expect: {
-        console.log({
-            a: 42,
-            p: function() {
-                return this.a;
-            }
-        }.p());
-    }
-    expect_stdout: "42"
-}
-
-issue_2208_3: {
-    options = {
-        inline: true,
-        side_effects: true,
-        unsafe: true,
-    }
-    input: {
-        a = 42;
-        console.log({
-            p: function() {
-                return function() {
-                    return this.a;
-                }();
-            }
-        }.p());
-    }
-    expect: {
-        a = 42;
-        console.log(function() {
-            return this.a;
-        }());
-    }
-    expect_stdout: "42"
-}
-
-issue_2208_4: {
-    options = {
-        inline: true,
-        side_effects: true,
-        unsafe: true,
-    }
-    input: {
-        function foo() {}
-        console.log({
-            a: foo(),
-            p: function() {
-                return 42;
-            }
-        }.p());
-    }
-    expect: {
-        function foo() {}
-        console.log((foo(), function() {
-            return 42;
-        })());
-    }
-    expect_stdout: "42"
-}
-
-issue_2208_5: {
-    options = {
-        inline: true,
-        side_effects: true,
-        unsafe: true,
-    }
-    input: {
-        console.log({
-            p: "FAIL",
-            p: function() {
-                return 42;
-            }
-        }.p());
-    }
-    expect: {
-        console.log(42);
-    }
-    expect_stdout: "42"
-}
-
-issue_2256: {
-    options = {
-        side_effects: true,
-    }
-    mangle = {
-        properties: {
-            keep_quoted: true,
-        },
-    }
-    input: {
-        ({ "keep": 1 });
-        g.keep = g.change;
-    }
-    expect: {
-        g.keep = g.g;
-    }
-}

test/compress/pure_getters.js

@@ -1,601 +0,0 @@
-strict: {
-    options = {
-        pure_getters: "strict",
-        reduce_vars: false,
-        side_effects: true,
-        toplevel: true,
-    }
-    input: {
-        var a, b = null, c = {};
-        a.prop;
-        b.prop;
-        c.prop;
-        d.prop;
-        null.prop;
-        (void 0).prop;
-        undefined.prop;
-    }
-    expect: {
-        var a, b = null, c = {};
-        a.prop;
-        b.prop;
-        c.prop;
-        d.prop;
-        null.prop;
-        (void 0).prop;
-        (void 0).prop;
-    }
-}
-
-strict_reduce_vars: {
-    options = {
-        pure_getters: "strict",
-        reduce_vars: true,
-        side_effects: true,
-        toplevel: true,
-    }
-    input: {
-        var a, b = null, c = {};
-        a.prop;
-        b.prop;
-        c.prop;
-        d.prop;
-        null.prop;
-        (void 0).prop;
-        undefined.prop;
-    }
-    expect: {
-        var a, b = null, c = {};
-        a.prop;
-        b.prop;
-        d.prop;
-        null.prop;
-        (void 0).prop;
-        (void 0).prop;
-    }
-}
-
-unsafe: {
-    options = {
-        pure_getters: true,
-        reduce_vars: false,
-        side_effects: true,
-        toplevel: true,
-    }
-    input: {
-        var a, b = null, c = {};
-        a.prop;
-        b.prop;
-        c.prop;
-        d.prop;
-        null.prop;
-        (void 0).prop;
-        undefined.prop;
-    }
-    expect: {
-        var a, b = null, c = {};
-        d;
-        null.prop;
-        (void 0).prop;
-        (void 0).prop;
-    }
-}
-
-unsafe_reduce_vars: {
-    options = {
-        pure_getters: true,
-        reduce_vars: true,
-        side_effects: true,
-        toplevel: true,
-    }
-    input: {
-        var a, b = null, c = {};
-        a.prop;
-        b.prop;
-        c.prop;
-        d.prop;
-        null.prop;
-        (void 0).prop;
-        undefined.prop;
-    }
-    expect: {
-        var a, b = null, c = {};
-        d;
-        null.prop;
-        (void 0).prop;
-        (void 0).prop;
-    }
-}
-
-chained: {
-    options = {
-        pure_getters: "strict",
-        side_effects: true,
-    }
-    input: {
-        a.b.c;
-    }
-    expect: {
-        a.b.c;
-    }
-}
-
-impure_getter_1: {
-    options = {
-        pure_getters: "strict",
-        side_effects: true,
-    }
-    input: {
-        ({
-            get a() {
-                console.log(1);
-            },
-            b: 1
-        }).a;
-        ({
-            get a() {
-                console.log(1);
-            },
-            b: 1
-        }).b;
-    }
-    expect: {
-        ({
-            get a() {
-                console.log(1);
-            },
-            b: 1
-        }).a;
-        ({
-            get a() {
-                console.log(1);
-            },
-            b: 1
-        }).b;
-    }
-    expect_stdout: "1"
-}
-
-impure_getter_2: {
-    options = {
-        pure_getters: true,
-        side_effects: true,
-    }
-    input: {
-        // will produce incorrect output because getter is not pure
-        ({
-            get a() {
-                console.log(1);
-            },
-            b: 1
-        }).a;
-        ({
-            get a() {
-                console.log(1);
-            },
-            b: 1
-        }).b;
-    }
-    expect: {}
-}
-
-issue_2110_1: {
-    options = {
-        cascade: true,
-        pure_getters: "strict",
-        sequences: true,
-        side_effects: true,
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        function f() {
-            function f() {}
-            function g() {
-                return this;
-            }
-            f.g = g;
-            return f.g();
-        }
-        console.log(typeof f());
-    }
-    expect: {
-        function f() {
-            function f() {}
-            return f.g = function() {
-                return this;
-            }, f.g();
-        }
-        console.log(typeof f());
-    }
-    expect_stdout: "function"
-}
-
-issue_2110_2: {
-    options = {
-        collapse_vars: true,
-        pure_getters: "strict",
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        function f() {
-            function f() {}
-            function g() {
-                return this;
-            }
-            f.g = g;
-            return f.g();
-        }
-        console.log(typeof f());
-    }
-    expect: {
-        function f() {
-            function f() {}
-            f.g = function() {
-                return this;
-            };
-            return f.g();
-        }
-        console.log(typeof f());
-    }
-    expect_stdout: "function"
-}
-
-set_immutable_1: {
-    options = {
-        collapse_vars: true,
-        evaluate: true,
-        pure_getters: "strict",
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        var a = 1;
-        a.foo += "";
-        if (a.foo) console.log("FAIL");
-        else console.log("PASS");
-    }
-    expect: {
-        1..foo += "";
-        if (1..foo) console.log("FAIL");
-        else console.log("PASS");
-    }
-    expect_stdout: "PASS"
-}
-
-set_immutable_2: {
-    options = {
-        cascade: true,
-        conditionals: true,
-        pure_getters: "strict",
-        reduce_vars: true,
-        sequences: true,
-        side_effects: true,
-        toplevel: true,
-    }
-    input: {
-        var a = 1;
-        a.foo += "";
-        if (a.foo) console.log("FAIL");
-        else console.log("PASS");
-    }
-    expect: {
-        var a = 1;
-        a.foo += "", a.foo ? console.log("FAIL") : console.log("PASS");
-    }
-    expect_stdout: "PASS"
-}
-
-set_immutable_3: {
-    options = {
-        collapse_vars: true,
-        evaluate: true,
-        pure_getters: "strict",
-        reduce_vars: true,
-        toplevel: true,
-        unused: true,
-    }
-    input: {
-        "use strict";
-        var a = 1;
-        a.foo += "";
-        if (a.foo) console.log("FAIL");
-        else console.log("PASS");
-    }
-    expect: {
-        "use strict";
-        1..foo += "";
-        if (1..foo) console.log("FAIL");
-        else console.log("PASS");
-    }
-    expect_stdout: true
-}
-
-set_immutable_4: {
-    options = {
-        cascade: true,
-        conditionals: true,
-        pure_getters: "strict",
-        reduce_vars: true,
-        sequences: true,
-        side_effects: true,
-        toplevel: true,
-    }
-    input: {
-        "use strict";
-        var a = 1;
-        a.foo += "";
-        if (a.foo) console.log("FAIL");
-        else console.log("PASS");
-    }
-    expect: {
-        "use strict";
-        var a = 1;
-        a.foo += "", a.foo ? console.log("FAIL") : console.log("PASS");
-    }
-    expect_stdout: true
-}
-
-set_mutable_1: {
-    options = {
-        collapse_vars: true,
-        evaluate: true,
-        pure_getters: "strict",
-        reduce_vars: true,
-        unused: true,
-    }
-    input: {
-        !function a() {
-            a.foo += "";
-            if (a.foo) console.log("PASS");
-            else console.log("FAIL");
-        }();
-    }
-    expect: {
-        !function a() {
-            if (a.foo += "") console.log("PASS");
-            else console.log("FAIL");
-        }();
-    }
-    expect_stdout: "PASS"
-}
-
-set_mutable_2: {
-    options = {
-        cascade: true,
-        conditionals: true,
-        pure_getters: "strict",
-        reduce_vars: true,
-        sequences: true,
-        side_effects: true,
-    }
-    input: {
-        !function a() {
-            a.foo += "";
-            if (a.foo) console.log("PASS");
-            else console.log("FAIL");
-        }();
-    }
-    expect: {
-        !function a() {
-            (a.foo += "") ? console.log("PASS") : console.log("FAIL");
-        }();
-    }
-    expect_stdout: "PASS"
-}
-
-issue_2313_1: {
-    options = {
-        cascade: true,
-        conditionals: true,
-        pure_getters: "strict",
-        sequences: true,
-        side_effects: true,
-    }
-    input: {
-        function x() {
-            console.log(1);
-            return {
-                y: function() {
-                    console.log(2);
-                    return {
-                        z: 0
-                    };
-                }
-            };
-        }
-        x().y().z++;
-        if (x().y().z) {
-            console.log(3);
-        }
-    }
-    expect: {
-        function x() {
-            return console.log(1), {
-                y: function() {
-                    return console.log(2), {
-                        z: 0
-                    };
-                }
-            };
-        }
-        x().y().z++,
-        x().y().z && console.log(3);
-    }
-    expect_stdout: [
-        "1",
-        "2",
-        "1",
-        "2",
-    ]
-}
-
-issue_2313_2: {
-    options = {
-        cascade: true,
-        conditionals: true,
-        pure_getters: true,
-        sequences: true,
-        side_effects: true,
-    }
-    input: {
-        function x() {
-            console.log(1);
-            return {
-                y: function() {
-                    console.log(2);
-                    return {
-                        z: 0
-                    };
-                }
-            };
-        }
-        x().y().z++;
-        if (x().y().z) {
-            console.log(3);
-        }
-    }
-    expect: {
-        function x() {
-            return console.log(1), {
-                y: function() {
-                    return console.log(2), {
-                        z: 0
-                    };
-                }
-            };
-        }
-        x().y().z++,
-        x().y().z && console.log(3);
-    }
-    expect_stdout: [
-        "1",
-        "2",
-        "1",
-        "2",
-    ]
-}
-
-issue_2313_3: {
-    options = {
-        collapse_vars: true,
-        conditionals: true,
-        pure_getters: "strict",
-    }
-    input: {
-        function x() {
-            console.log(1);
-            return {
-                y: function() {
-                    console.log(2);
-                    return {
-                        z: 0
-                    };
-                }
-            };
-        }
-        x().y().z++;
-        if (x().y().z) {
-            console.log(3);
-        }
-    }
-    expect: {
-        function x() {
-            console.log(1);
-            return {
-                y: function() {
-                    console.log(2);
-                    return {
-                        z: 0
-                    };
-                }
-            };
-        }
-        x().y().z++;
-        x().y().z && console.log(3);
-    }
-    expect_stdout: [
-        "1",
-        "2",
-        "1",
-        "2",
-    ]
-}
-
-issue_2313_4: {
-    options = {
-        collapse_vars: true,
-        conditionals: true,
-        pure_getters: true,
-    }
-    input: {
-        function x() {
-            console.log(1);
-            return {
-                y: function() {
-                    console.log(2);
-                    return {
-                        z: 0
-                    };
-                }
-            };
-        }
-        x().y().z++;
-        if (x().y().z) {
-            console.log(3);
-        }
-    }
-    expect: {
-        function x() {
-            console.log(1);
-            return {
-                y: function() {
-                    console.log(2);
-                    return {
-                        z: 0
-                    };
-                }
-            };
-        }
-        x().y().z++;
-        x().y().z && console.log(3);
-    }
-    expect_stdout: [
-        "1",
-        "2",
-        "1",
-        "2",
-    ]
-}
-
-issue_2313_5: {
-    options = {
-        pure_getters: "strict",
-        side_effects: true,
-    }
-    input: {
-        x().y++;
-        x().y;
-    }
-    expect: {
-        x().y++;
-        x().y;
-    }
-}
-
-issue_2313_6: {
-    options = {
-        pure_getters: true,
-        side_effects: true,
-    }
-    input: {
-        x().y++;
-        x().y;
-    }
-    expect: {
-        x().y++;
-        x();
-    }
-}

test/compress/sandbox.js

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

test/compress/screw-ie8.js

@@ -1,9 +1,9 @@
 do_screw: {
     options = {
-        ie8: false,
+        screw_ie8: true,
     }
     beautify = {
-        ie8: false,
+        screw_ie8: true,
         ascii_only: true,
     }
     input: {
@@ -14,10 +14,10 @@ do_screw: {
 
 dont_screw: {
     options = {
-        ie8: true,
+        screw_ie8: false,
     }
     beautify = {
-        ie8: true,
+        screw_ie8: false,
         ascii_only: true,
     }
     input: {
@@ -28,7 +28,7 @@ dont_screw: {
 
 do_screw_constants: {
     options = {
-        ie8: false,
+        screw_ie8: true,
     }
     input: {
         f(undefined, Infinity);
@@ -38,7 +38,7 @@ do_screw_constants: {
 
 dont_screw_constants: {
     options = {
-        ie8: true,
+        screw_ie8: false,
     }
     input: {
         f(undefined, Infinity);
@@ -47,15 +47,9 @@ dont_screw_constants: {
 }
 
 do_screw_try_catch: {
-    options = {
-        ie8: false,
-    }
-    mangle = {
-        ie8: false,
-    }
-    beautify = {
-        ie8: false,
-    }
+    options = { screw_ie8: true };
+    mangle = { screw_ie8: true };
+    beautify = { screw_ie8: true };
     input: {
         good = function(e){
             return function(error){
@@ -81,15 +75,9 @@ do_screw_try_catch: {
 }
 
 dont_screw_try_catch: {
-    options = {
-        ie8: true,
-    }
-    mangle = {
-        ie8: true,
-    }
-    beautify = {
-        ie8: true,
-    }
+    options = { screw_ie8: false };
+    mangle = { screw_ie8: false };
+    beautify = { screw_ie8: false };
     input: {
         bad = function(e){
             return function(error){
@@ -115,15 +103,9 @@ dont_screw_try_catch: {
 }
 
 do_screw_try_catch_undefined: {
-    options = {
-        ie8: false,
-    }
-    mangle = {
-        ie8: false,
-    }
-    beautify = {
-        ie8: false,
-    }
+    options = { screw_ie8: true };
+    mangle = { screw_ie8: true };
+    beautify = { screw_ie8: true };
     input: {
         function a(b){
             try {
@@ -150,15 +132,9 @@ do_screw_try_catch_undefined: {
 }
 
 dont_screw_try_catch_undefined: {
-    options = {
-        ie8: true,
-    }
-    mangle = {
-        ie8: true,
-    }
-    beautify = {
-        ie8: true,
-    }
+    options = { screw_ie8: false };
+    mangle = { screw_ie8: false };
+    beautify = { screw_ie8: false };
     input: {
         function a(b){
             try {
@@ -188,11 +164,11 @@ reduce_vars: {
     options = {
         evaluate: true,
         reduce_vars: true,
-        ie8: true,
+        screw_ie8: false,
         unused: true,
     }
     mangle = {
-        ie8: true,
+        screw_ie8: false,
     }
     input: {
         function f() {
@@ -220,174 +196,38 @@ reduce_vars: {
 
 issue_1586_1: {
     options = {
-        ie8: true,
+        screw_ie8: false,
     }
     mangle = {
-        ie8: true,
+        screw_ie8: false,
     }
     input: {
         function f() {
             try {
-                x();
             } catch (err) {
                 console.log(err.message);
             }
         }
     }
-    expect_exact: "function f(){try{x()}catch(c){console.log(c.message)}}"
+    expect_exact: "function f(){try{}catch(c){console.log(c.message)}}"
+    expect_stdout: true
 }
 
 issue_1586_2: {
     options = {
-        ie8: false,
+        screw_ie8: true,
     }
     mangle = {
-        ie8: false,
+        screw_ie8: true,
     }
     input: {
         function f() {
             try {
-                x();
             } catch (err) {
                 console.log(err.message);
             }
         }
     }
-    expect_exact: "function f(){try{x()}catch(c){console.log(c.message)}}"
-}
-
-issue_2120_1: {
-    mangle = {
-        ie8: false,
-    }
-    input: {
-        "aaaaaaaa";
-        var a = 1, b = "FAIL";
-        try {
-            throw 1;
-        } catch (c) {
-            try {
-                throw 0;
-            } catch (a) {
-                if (c) b = "PASS";
-            }
-        }
-        console.log(b);
-    }
-    expect: {
-        "aaaaaaaa";
-        var a = 1, b = "FAIL";
-        try {
-            throw 1;
-        } catch (t) {
-            try {
-                throw 0;
-            } catch (a) {
-                if (t) b = "PASS";
-            }
-        }
-        console.log(b);
-    }
-    expect_stdout: "PASS"
-}
-
-issue_2120_2: {
-    mangle = {
-        ie8: true,
-    }
-    input: {
-        "aaaaaaaa";
-        var a = 1, b = "FAIL";
-        try {
-            throw 1;
-        } catch (c) {
-            try {
-                throw 0;
-            } catch (a) {
-                if (c) b = "PASS";
-            }
-        }
-        console.log(b);
-    }
-    expect: {
-        "aaaaaaaa";
-        var a = 1, b = "FAIL";
-        try {
-            throw 1;
-        } catch (c) {
-            try {
-                throw 0;
-            } catch (a) {
-                if (c) b = "PASS";
-            }
-        }
-        console.log(b);
-    }
-    expect_stdout: "PASS"
-}
-
-issue_2254_1: {
-    mangle = {
-        ie8: false,
-    }
-    input: {
-        "eeeeee";
-        try {
-            console.log(f("PASS"));
-        } catch (e) {}
-        function f(s) {
-            try {
-                throw "FAIL";
-            } catch (e) {
-                return s;
-            }
-        }
-    }
-    expect: {
-        "eeeeee";
-        try {
-            console.log(f("PASS"));
-        } catch (e) {}
-        function f(e) {
-            try {
-                throw "FAIL";
-            } catch (t) {
-                return e;
-            }
-        }
-    }
-    expect_stdout: "PASS"
-}
-
-issue_2254_2: {
-    mangle = {
-        ie8: true,
-    }
-    input: {
-        "eeeeee";
-        try {
-            console.log(f("PASS"));
-        } catch (e) {}
-        function f(s) {
-            try {
-                throw "FAIL";
-            } catch (e) {
-                return s;
-            }
-        }
-    }
-    expect: {
-        "eeeeee";
-        try {
-            console.log(f("PASS"));
-        } catch (e) {}
-        function f(t) {
-            try {
-                throw "FAIL";
-            } catch (e) {
-                return t;
-            }
-        }
-    }
-    expect_stdout: "PASS"
+    expect_exact: "function f(){try{}catch(c){console.log(c.message)}}"
+    expect_stdout: true
 }

test/compress/sequences.js

@@ -176,11 +176,6 @@ for_sequences: {
         // 4
         x = (foo in bar);
         for (y = 5; false;);
-        // 5
-        x = function() {
-            foo in bar;
-        };
-        for (y = 5; false;);
     }
     expect: {
         // 1
@@ -193,10 +188,6 @@ for_sequences: {
         // 4
         x = (foo in bar);
         for (y = 5; false;);
-        // 5
-        for (x = function() {
-            foo in bar;
-        }, y = 5; false;);
     }
 }
 
@@ -449,334 +440,3 @@ func_def_5: {
     }
     expect_stdout: "true"
 }
-
-issue_1758: {
-    options = {
-        sequences: true,
-        side_effects: true,
-    }
-    input: {
-        console.log(function(c) {
-            var undefined = 42;
-            return function() {
-                c--;
-                c--, c.toString();
-                return;
-            }();
-        }());
-    }
-    expect: {
-        console.log(function(c) {
-            var undefined = 42;
-            return function() {
-                return c--, c--, void c.toString();
-            }();
-        }());
-    }
-    expect_stdout: "undefined"
-}
-
-delete_seq_1: {
-    options = {
-        booleans: true,
-        side_effects: true,
-    }
-    input: {
-        console.log(delete (1, undefined));
-        console.log(delete (1, void 0));
-        console.log(delete (1, Infinity));
-        console.log(delete (1, 1 / 0));
-        console.log(delete (1, NaN));
-        console.log(delete (1, 0 / 0));
-    }
-    expect: {
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-    }
-    expect_stdout: true
-}
-
-delete_seq_2: {
-    options = {
-        booleans: true,
-        side_effects: true,
-    }
-    input: {
-        console.log(delete (1, 2, undefined));
-        console.log(delete (1, 2, void 0));
-        console.log(delete (1, 2, Infinity));
-        console.log(delete (1, 2, 1 / 0));
-        console.log(delete (1, 2, NaN));
-        console.log(delete (1, 2, 0 / 0));
-    }
-    expect: {
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-    }
-    expect_stdout: true
-}
-
-delete_seq_3: {
-    options = {
-        booleans: true,
-        keep_infinity: true,
-        side_effects: true,
-    }
-    input: {
-        console.log(delete (1, 2, undefined));
-        console.log(delete (1, 2, void 0));
-        console.log(delete (1, 2, Infinity));
-        console.log(delete (1, 2, 1 / 0));
-        console.log(delete (1, 2, NaN));
-        console.log(delete (1, 2, 0 / 0));
-    }
-    expect: {
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-        console.log(!0);
-    }
-    expect_stdout: true
-}
-
-delete_seq_4: {
-    options = {
-        booleans: true,
-        sequences: true,
-        side_effects: true,
-    }
-    input: {
-        function f() {}
-        console.log(delete (f(), undefined));
-        console.log(delete (f(), void 0));
-        console.log(delete (f(), Infinity));
-        console.log(delete (f(), 1 / 0));
-        console.log(delete (f(), NaN));
-        console.log(delete (f(), 0 / 0));
-    }
-    expect: {
-        function f() {}
-        console.log((f(), !0)),
-        console.log((f(), !0)),
-        console.log((f(), !0)),
-        console.log((f(), !0)),
-        console.log((f(), !0)),
-        console.log((f(), !0));
-    }
-    expect_stdout: true
-}
-
-delete_seq_5: {
-    options = {
-        booleans: true,
-        keep_infinity: true,
-        sequences: true,
-        side_effects: true,
-    }
-    input: {
-        function f() {}
-        console.log(delete (f(), undefined));
-        console.log(delete (f(), void 0));
-        console.log(delete (f(), Infinity));
-        console.log(delete (f(), 1 / 0));
-        console.log(delete (f(), NaN));
-        console.log(delete (f(), 0 / 0));
-    }
-    expect: {
-        function f() {}
-        console.log((f(), !0)),
-        console.log((f(), !0)),
-        console.log((f(), !0)),
-        console.log((f(), !0)),
-        console.log((f(), !0)),
-        console.log((f(), !0));
-    }
-    expect_stdout: true
-}
-
-delete_seq_6: {
-    options = {
-        booleans: true,
-        side_effects: true,
-    }
-    input: {
-        var a;
-        console.log(delete (1, a));
-    }
-    expect: {
-        var a;
-        console.log(!0);
-    }
-    expect_stdout: true
-}
-
-side_effects: {
-    options = {
-        sequences: true,
-        side_effects: true,
-    }
-    input: {
-        0, a(), 1, b(), 2, c(), 3;
-    }
-    expect: {
-        a(), b(), c();
-    }
-}
-
-side_effects_cascade_1: {
-    options = {
-        cascade: true,
-        conditionals: true,
-        sequences: true,
-        side_effects: true,
-    }
-    input: {
-        function f(a, b) {
-            a -= 42;
-            if (a < 0) a = 0;
-            b.a = a;
-        }
-    }
-    expect: {
-        function f(a, b) {
-            (a -= 42) < 0 && (a = 0), b.a = a;
-        }
-    }
-}
-
-side_effects_cascade_2: {
-    options = {
-        cascade: true,
-        side_effects: true,
-    }
-    input: {
-        function f(a, b) {
-            b = a,
-            !a + (b += a) || (b += a),
-            b = a,
-            b;
-        }
-    }
-    expect: {
-        function f(a, b) {
-            b = a,
-            !a + (b += a) || (b += a),
-            b = a;
-        }
-    }
-}
-
-side_effects_cascade_3: {
-    options = {
-        cascade: true,
-        conditionals: true,
-        side_effects: true,
-    }
-    input: {
-        function f(a, b) {
-            "foo" ^ (b += a),
-            b ? false : (b = a) ? -1 : (b -= a) - (b ^= a),
-            a-- || !a,
-            a;
-        }
-    }
-    expect: {
-        function f(a, b) {
-            !(b += a) && ((b = a) || (b -= a, b ^= a)),
-            --a;
-        }
-    }
-}
-
-issue_27: {
-    options = {
-        cascade: true,
-        passes: 2,
-        sequences: true,
-        side_effects: true,
-        unused: true,
-    }
-    input: {
-        (function(jQuery) {
-            var $;
-            $ = jQuery;
-            $("body").addClass("foo");
-        })(jQuery);
-    }
-    expect: {
-        (function(jQuery) {
-            jQuery("body").addClass("foo");
-        })(jQuery);
-    }
-}
-
-issue_2062: {
-    options = {
-        booleans: true,
-        cascade: true,
-        conditionals: true,
-        side_effects: true,
-    }
-    input: {
-        var a = 1;
-        if ([ a || a++ + a--, a++ + a--, a && a.var ]);
-        console.log(a);
-    }
-    expect: {
-        var a = 1;
-        a || (a++, a--), a++, --a && a.var;
-        console.log(a);
-    }
-    expect_stdout: "1"
-}
-
-issue_2313: {
-    options = {
-        cascade: true,
-        sequences: true,
-        side_effects: true,
-    }
-    input: {
-        var a = 0, b = 0;
-        var foo = {
-            get c() {
-                a++;
-                return 42;
-            },
-            set c(c) {
-                b++;
-            },
-            d: function() {
-                this.c++;
-                if (this.c) console.log(a, b);
-            }
-        }
-        foo.d();
-    }
-    expect: {
-        var a = 0, b = 0;
-        var foo = {
-            get c() {
-                return a++, 42;
-            },
-            set c(c) {
-                b++;
-            },
-            d: function() {
-                if (this.c++, this.c) console.log(a, b);
-            }
-        }
-        foo.d();
-    }
-    expect_stdout: "2 1"
-}

test/compress/string-literal.js

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

test/compress/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/switch.js

@@ -1,10 +1,5 @@
 constant_switch_1: {
-    options = {
-        dead_code: true,
-        evaluate: true,
-        side_effects: true,
-        switches: true,
-    }
+    options = { dead_code: true, evaluate: true };
     input: {
         switch (1+1) {
           case 1: foo(); break;
@@ -18,12 +13,7 @@ constant_switch_1: {
 }
 
 constant_switch_2: {
-    options = {
-        dead_code: true,
-        evaluate: true,
-        side_effects: true,
-        switches: true,
-    }
+    options = { dead_code: true, evaluate: true };
     input: {
         switch (1) {
           case 1: foo();
@@ -38,12 +28,7 @@ constant_switch_2: {
 }
 
 constant_switch_3: {
-    options = {
-        dead_code: true,
-        evaluate: true,
-        side_effects: true,
-        switches: true,
-    }
+    options = { dead_code: true, evaluate: true };
     input: {
         switch (10) {
           case 1: foo();
@@ -59,12 +44,7 @@ constant_switch_3: {
 }
 
 constant_switch_4: {
-    options = {
-        dead_code: true,
-        evaluate: true,
-        side_effects: true,
-        switches: true,
-    }
+    options = { dead_code: true, evaluate: true };
     input: {
         switch (2) {
           case 1:
@@ -85,12 +65,7 @@ constant_switch_4: {
 }
 
 constant_switch_5: {
-    options = {
-        dead_code: true,
-        evaluate: true,
-        side_effects: true,
-        switches: true,
-    }
+    options = { dead_code: true, evaluate: true };
     input: {
         switch (1) {
           case 1:
@@ -119,12 +94,7 @@ constant_switch_5: {
 }
 
 constant_switch_6: {
-    options = {
-        dead_code: true,
-        evaluate: true,
-        side_effects: true,
-        switches: true,
-    }
+    options = { dead_code: true, evaluate: true };
     input: {
         OUT: {
             foo();
@@ -153,12 +123,7 @@ constant_switch_6: {
 }
 
 constant_switch_7: {
-    options = {
-        dead_code: true,
-        evaluate: true,
-        side_effects: true,
-        switches: true,
-    }
+    options = { dead_code: true, evaluate: true };
     input: {
         OUT: {
             foo();
@@ -196,12 +161,7 @@ constant_switch_7: {
 }
 
 constant_switch_8: {
-    options = {
-        dead_code: true,
-        evaluate: true,
-        side_effects: true,
-        switches: true,
-    }
+    options = { dead_code: true, evaluate: true };
     input: {
         OUT: switch (1) {
           case 1:
@@ -225,12 +185,7 @@ constant_switch_8: {
 }
 
 constant_switch_9: {
-    options = {
-        dead_code: true,
-        evaluate: true,
-        side_effects: true,
-        switches: true,
-    }
+    options = { dead_code: true, evaluate: true };
     input: {
         OUT: switch (1) {
           case 1:
@@ -255,10 +210,7 @@ constant_switch_9: {
 }
 
 drop_default_1: {
-    options = {
-        dead_code: true,
-        switches: true,
-    }
+    options = { dead_code: true };
     input: {
         switch (foo) {
           case 'bar': baz();
@@ -273,10 +225,7 @@ drop_default_1: {
 }
 
 drop_default_2: {
-    options = {
-        dead_code: true,
-        switches: true,
-    }
+    options = { dead_code: true };
     input: {
         switch (foo) {
           case 'bar': baz(); break;
@@ -292,10 +241,7 @@ drop_default_2: {
 }
 
 keep_default: {
-    options = {
-        dead_code: true,
-        switches: true,
-    }
+    options = { dead_code: true };
     input: {
         switch (foo) {
           case 'bar': baz();
@@ -317,8 +263,6 @@ issue_1663: {
     options = {
         dead_code: true,
         evaluate: true,
-        side_effects: true,
-        switches: true,
     }
     input: {
         var a = 100, b = 10;
@@ -350,7 +294,6 @@ issue_1663: {
 drop_case: {
     options = {
         dead_code: true,
-        switches: true,
     }
     input: {
         switch (foo) {
@@ -369,7 +312,6 @@ drop_case: {
 keep_case: {
     options = {
         dead_code: true,
-        switches: true,
     }
     input: {
         switch (foo) {
@@ -390,7 +332,6 @@ issue_376: {
     options = {
         dead_code: true,
         evaluate: true,
-        switches: true,
     }
     input: {
         switch (true) {
@@ -413,7 +354,6 @@ issue_376: {
 issue_441_1: {
     options = {
         dead_code: true,
-        switches: true,
     }
     input: {
         switch (foo) {
@@ -441,7 +381,6 @@ issue_441_1: {
 issue_441_2: {
     options = {
         dead_code: true,
-        switches: true,
     }
     input: {
         switch (foo) {
@@ -475,8 +414,6 @@ issue_1674: {
     options = {
         dead_code: true,
         evaluate: true,
-        side_effects: true,
-        switches: true,
     }
     input: {
         switch (0) {
@@ -498,7 +435,6 @@ issue_1679: {
     options = {
         dead_code: true,
         evaluate: true,
-        switches: true,
     }
     input: {
         var a = 100, b = 10;
@@ -546,7 +482,6 @@ issue_1680_1: {
     options = {
         dead_code: true,
         evaluate: true,
-        switches: true,
     }
     input: {
         function f(x) {
@@ -587,7 +522,6 @@ issue_1680_1: {
 issue_1680_2: {
     options = {
         dead_code: true,
-        switches: true,
     }
     input: {
         var a = 100, b = 10;
@@ -623,7 +557,6 @@ issue_1680_2: {
 issue_1690_1: {
     options = {
         dead_code: true,
-        switches: true,
     }
     input: {
         switch (console.log("PASS")) {}
@@ -637,7 +570,6 @@ issue_1690_1: {
 issue_1690_2: {
     options = {
         dead_code: false,
-        switches: true,
     }
     input: {
         switch (console.log("PASS")) {}
@@ -653,7 +585,6 @@ if_switch_typeof: {
         conditionals: true,
         dead_code: true,
         side_effects: true,
-        switches: true,
     }
     input: {
         if (a) switch(typeof b) {}
@@ -666,7 +597,6 @@ if_switch_typeof: {
 issue_1698: {
     options = {
         side_effects: true,
-        switches: true,
     }
     input: {
         var a = 1;
@@ -688,7 +618,6 @@ issue_1698: {
 issue_1705_1: {
     options = {
         dead_code: true,
-        switches: true,
     }
     input: {
         var a = 0;
@@ -717,7 +646,6 @@ issue_1705_2: {
         reduce_vars: true,
         sequences: true,
         side_effects: true,
-        switches: true,
         toplevel: true,
         unused: true,
     }
@@ -738,7 +666,6 @@ issue_1705_2: {
 issue_1705_3: {
     options = {
         dead_code: true,
-        switches: true,
     }
     input: {
         switch (a) {
@@ -753,66 +680,3 @@ issue_1705_3: {
     }
     expect_stdout: true
 }
-
-beautify: {
-    beautify = {
-        beautify: true,
-    }
-    input: {
-        switch (a) {
-          case 0:
-          case 1:
-            break;
-          case 2:
-          default:
-        }
-        switch (b) {
-          case 3:
-            foo();
-            bar();
-          default:
-            break;
-        }
-    }
-    expect_exact: [
-        "switch (a) {",
-        "  case 0:",
-        "  case 1:",
-        "    break;",
-        "",
-        "  case 2:",
-        "  default:",
-        "}",
-        "",
-        "switch (b) {",
-        "  case 3:",
-        "    foo();",
-        "    bar();",
-        "",
-        "  default:",
-        "    break;",
-        "}",
-    ]
-}
-
-issue_1758: {
-    options = {
-        dead_code: true,
-        switches: true,
-    }
-    input: {
-        var a = 1, b = 2;
-        switch (a--) {
-          default:
-            b++;
-        }
-        console.log(a, b);
-    }
-    expect: {
-        var a = 1, b = 2;
-        a--;
-        b++;
-        console.log(a, b);
-    }
-    expect_stdout: "0 3"
-}

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

test/compress/unicode.js

@@ -16,42 +16,105 @@ unicode_parse_variables: {
     }
 }
 
-issue_2242_1: {
-    beautify = {
-        ascii_only: false,
-    }
+unicode_escaped_identifier: {
+    beautify = {ecma: 6}
     input: {
-        console.log("\ud83d", "\ude00", "\ud83d\ude00", "\ud83d@\ude00");
+        var \u{61} = "foo";
+        var \u{10000} = "bar";
     }
-    expect_exact: 'console.log("\\ud83d","\\ude00","\ud83d\ude00","\\ud83d@\\ude00");'
+    expect_exact: 'var a="foo";var \u{10000}="bar";';
 }
 
-issue_2242_2: {
-    beautify = {
-        ascii_only: true,
-    }
+unicode_identifier_ascii_only: {
+    beautify = {ascii_only: true, ecma: 6}
     input: {
-        console.log("\ud83d", "\ude00", "\ud83d\ude00", "\ud83d@\ude00");
+        var \u{0061} = "hi";
+        var bar = "h\u{0065}llo";
+        var \u{10000} = "testing \u{101111}";
     }
-    expect_exact: 'console.log("\\ud83d","\\ude00","\\ud83d\\ude00","\\ud83d@\\ude00");'
+    expect_exact: 'var a="hi";var bar="hello";var \\u{10000}="testing \\u{101111}";'
 }
 
-issue_2242_3: {
-    options = {
-        evaluate: false,
-    }
+unicode_string_literals: {
+    beautify = {ascii_only: true, ecma: 6}
     input: {
-        console.log("\ud83d" + "\ude00", "\ud83d" + "@" + "\ude00");
+        var a = "6 length unicode character: \u{101111}";
     }
-    expect_exact: 'console.log("\\ud83d"+"\\ude00","\\ud83d"+"@"+"\\ude00");'
+    expect_exact: 'var a="6 length unicode character: \\u{101111}";'
 }
 
-issue_2242_4: {
-    options = {
-        evaluate: true,
-    }
+// 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: {
-        console.log("\ud83d" + "\ude00", "\ud83d" + "@" + "\ude00");
+        var \u{10000} = "6 length unicode character: \u{10FFFF}";
     }
-    expect_exact: 'console.log("\ud83d\ude00","\\ud83d@\\ude00");'
+    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 +1,192 @@
+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);"
+}
+
+yield_dot: {
+    options = {
+    }
+    input: {
+        function* foo(){
+            yield x.foo;
+            (yield x).foo;
+            yield (yield obj.foo()).bar();
+        }
+    }
+    expect_exact: "function*foo(){yield x.foo;(yield x).foo;yield(yield obj.foo()).bar()}"
+}
+
+yield_sub: {
+    options = {
+    }
+    input: {
+        function* foo(){
+            yield x['foo'];
+            (yield x)['foo'];
+            yield (yield obj.foo())['bar']();
+        }
+    }
+    expect_exact: 'function*foo(){yield x["foo"];(yield x)["foo"];yield(yield obj.foo())["bar"]()}'
+}

test/exports.js

@@ -1,14 +0,0 @@
-exports["Compressor"] = Compressor;
-exports["JS_Parse_Error"] = JS_Parse_Error;
-exports["OutputStream"] = OutputStream;
-exports["SourceMap"] = SourceMap;
-exports["TreeWalker"] = TreeWalker;
-exports["base54"] = base54;
-exports["defaults"] = defaults;
-exports["mangle_properties"] = mangle_properties;
-exports["minify"] = minify;
-exports["parse"] = parse;
-exports["reserve_quoted_keys"] = reserve_quoted_keys;
-exports["string_template"] = string_template;
-exports["tokenizer"] = tokenizer;
-exports["is_identifier"] = is_identifier;

test/fetch.js

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

test/input/invalid/assign_4.js

@@ -1 +0,0 @@
-++null

test/input/invalid/delete.js

@@ -1,14 +0,0 @@
-function f(x) {
-    delete 42;
-    delete (0, x);
-    delete null;
-    delete x;
-}
-
-function g(x) {
-    "use strict";
-    delete 42;
-    delete (0, x);
-    delete null;
-    delete x;
-}

test/input/invalid/dot_1.js

@@ -1 +0,0 @@
-a.=

test/input/invalid/dot_2.js

@@ -1 +0,0 @@
-%.a;

test/input/invalid/dot_3.js

@@ -1 +0,0 @@
-a./();

test/input/invalid/else.js

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