v3.5.10

fixes #3253
fixes #3254

README.md

@@ -636,6 +636,9 @@ If you're using the `X-SourceMap` header instead, you can just omit `sourceMap.u
 - `expression` (default: `false`) -- Pass `true` to preserve completion values
   from terminal statements without `return`, e.g. in bookmarklets.
 
+- `functions` (default: `true`) -- convert declarations from `var`to `function`
+  whenever possible.
+
 - `global_defs` (default: `{}`) -- see [conditional compilation](#conditional-compilation)
 
 - `hoist_funs` (default: `false`) -- hoist function declarations

bin/uglifyjs

@@ -63,7 +63,7 @@ if (program.configFile) {
     }
 }
 if (!program.output && program.sourceMap && program.sourceMap.url != "inline") {
-    fatal("ERROR: cannot write source map to STDOUT");
+    fatal("cannot write source map to STDOUT");
 }
 [
     "compress",
@@ -78,6 +78,15 @@ if (!program.output && program.sourceMap && program.sourceMap.url != "inline") {
         options[name] = program[name];
     }
 });
+if (program.verbose) {
+    options.warnings = "verbose";
+} else if (program.warn) {
+    options.warnings = true;
+}
+if (options.warnings) {
+    UglifyJS.AST_Node.log_function(print_error, options.warnings == "verbose");
+    delete options.warnings;
+}
 if (program.beautify) {
     options.output = typeof program.beautify == "object" ? program.beautify : {};
     if (!("beautify" in options.output)) {
@@ -124,7 +133,7 @@ if (program.parse) {
     if (!program.parse.acorn && !program.parse.spidermonkey) {
         options.parse = program.parse;
     } else if (program.sourceMap && program.sourceMap.content == "inline") {
-        fatal("ERROR: inline source map only works with built-in parser");
+        fatal("inline source map only works with built-in parser");
     }
 }
 if (~program.rawArgs.indexOf("--rename")) {
@@ -144,15 +153,8 @@ if (typeof program.sourceMap == "object" && "base" in program.sourceMap) {
         };
     }();
 }
-if (program.verbose) {
-    options.warnings = "verbose";
-} else if (program.warn) {
-    options.warnings = true;
-}
 if (program.self) {
-    if (program.args.length) {
+    if (program.args.length) UglifyJS.AST_Node.warn("Ignoring input files since --self was passed");
-        print_error("WARN: Ignoring input files since --self was passed");
-    }
     if (!options.wrap) options.wrap = "UglifyJS";
     simple_glob(UglifyJS.FILES).forEach(function(name) {
         files[convert_path(name)] = read_file(name);
@@ -180,12 +182,9 @@ function convert_ast(fn) {
 }
 
 function run() {
-    UglifyJS.AST_Node.warn_function = function(msg) {
-        print_error("WARN: " + msg);
-    };
     var content = program.sourceMap && program.sourceMap.content;
     if (content && content != "inline") {
-        print_error("INFO: Using input source map: " + content);
+        UglifyJS.AST_Node.info("Using input source map: " + content);
         options.sourceMap.content = read_file(content, content);
     }
     if (program.timings) options.timings = true;
@@ -293,7 +292,11 @@ function run() {
 }
 
 function fatal(message) {
-    if (message instanceof Error) message = message.stack.replace(/^\S*?Error:/, "ERROR:")
+    if (message instanceof Error) {
+        message = message.stack.replace(/^\S*?Error:/, "ERROR:")
+    } else {
+        message = "ERROR: " + message;
+    }
     print_error(message);
     process.exit(1);
 }
@@ -372,7 +375,7 @@ function parse_js(flag) {
             }));
         } catch (ex) {
             if (flag) {
-                fatal("Error parsing arguments for '" + flag + "': " + value);
+                fatal("cannot parse arguments for '" + flag + "': " + value);
             } else {
                 options[value] = null;
             }

lib/ast.js

@@ -118,9 +118,25 @@ var AST_Node = DEFNODE("Node", "start end", {
     }
 }, null);
 
-AST_Node.warn = function(txt, props) {
+(AST_Node.log_function = function(fn, verbose) {
-    if (AST_Node.warn_function) AST_Node.warn_function(string_template(txt, props));
+    var printed = Object.create(null);
+    if (fn) {
+        AST_Node.info = verbose ? function(text, props) {
+            log("INFO: " + string_template(text, props));
+        } : noop;
+        AST_Node.warn = function(text, props) {
+            log("WARN: " + string_template(text, props));
         };
+    } else {
+        AST_Node.info = AST_Node.warn = noop;
+    }
+
+    function log(msg) {
+        if (printed[msg]) return;
+        printed[msg] = true;
+        fn(msg);
+    }
+})();
 
 /* -----[ statements ]----- */
 
@@ -773,7 +789,7 @@ var AST_Label = DEFNODE("Label", "references", {
     }
 }, AST_Symbol);
 
-var AST_SymbolRef = DEFNODE("SymbolRef", null, {
+var AST_SymbolRef = DEFNODE("SymbolRef", "fixed", {
     $documentation: "Reference to some symbol (not definition/declaration)",
 }, AST_Symbol);
 

lib/minify.js

@@ -51,7 +51,6 @@ function to_json(cache) {
 }
 
 function minify(files, options) {
-    var warn_function = AST_Node.warn_function;
     try {
         options = defaults(options, {
             compress: {},
@@ -78,7 +77,6 @@ function minify(files, options) {
         set_shorthand("ie8", options, [ "compress", "mangle", "output" ]);
         set_shorthand("keep_fnames", options, [ "compress", "mangle" ]);
         set_shorthand("toplevel", options, [ "compress", "mangle" ]);
-        set_shorthand("warnings", options, [ "compress" ]);
         var quoted_props;
         if (options.mangle) {
             options.mangle = defaults(options.mangle, {
@@ -116,11 +114,9 @@ function minify(files, options) {
             }, true);
         }
         var warnings = [];
-        if (options.warnings && !AST_Node.warn_function) {
+        if (options.warnings) AST_Node.log_function(function(warning) {
-            AST_Node.warn_function = function(warning) {
             warnings.push(warning);
-            };
+        }, options.warnings == "verbose");
-        }
         if (timings) timings.parse = Date.now();
         var source_maps, toplevel;
         if (files instanceof AST_Toplevel) {
@@ -240,7 +236,5 @@ function minify(files, options) {
         return result;
     } catch (ex) {
         return { error: ex };
-    } finally {
-        AST_Node.warn_function = warn_function;
     }
 }

lib/output.js

@@ -123,7 +123,7 @@ function OutputStream(options) {
         });
     } : function(str) {
         var s = "";
-        for (var i = 0, len = str.length; i < len; i++) {
+        for (var i = 0; i < str.length; i++) {
             if (is_surrogate_pair_head(str[i]) && !is_surrogate_pair_tail(str[i + 1])
                 || is_surrogate_pair_tail(str[i]) && !is_surrogate_pair_head(str[i - 1])) {
                 s += "\\u" + str.charCodeAt(i).toString(16);
@@ -217,23 +217,12 @@ function OutputStream(options) {
 
     var flush_mappings = mappings ? function() {
         mappings.forEach(function(mapping) {
-            try {
             options.source_map.add(
                 mapping.token.file,
                 mapping.line, mapping.col,
                 mapping.token.line, mapping.token.col,
                 !mapping.name && mapping.token.type == "name" ? mapping.token.value : mapping.name
             );
-            } catch(ex) {
-                AST_Node.warn("Couldn't figure out mapping for {file}:{line},{col} → {cline},{ccol} [{name}]", {
-                    file: mapping.token.file,
-                    line: mapping.token.line,
-                    col: mapping.token.col,
-                    cline: mapping.line,
-                    ccol: mapping.col,
-                    name: mapping.name || ""
-                })
-            }
         });
         mappings = [];
     } : noop;

lib/parse.js

@@ -164,10 +164,6 @@ function is_unicode_connector_punctuation(ch) {
     return UNICODE.connector_punctuation.test(ch);
 }
 
-function is_identifier(name) {
-    return !RESERVED_WORDS[name] && /^[a-z_$][a-z0-9_$]*$/i.test(name);
-}
-
 function is_identifier_start(code) {
     return code == 36 || code == 95 || is_letter(code);
 }
@@ -272,10 +268,8 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
 
     function find_eol() {
         var text = S.text;
-        for (var i = S.pos, n = S.text.length; i < n; ++i) {
+        for (var i = S.pos; i < S.text.length; ++i) {
-            var ch = text[i];
+            if (NEWLINE_CHARS[text[i]]) return i;
-            if (NEWLINE_CHARS[ch])
-                return i;
         }
         return -1;
     }

lib/scope.js

@@ -61,8 +61,6 @@ SymbolDef.next_id = 1;
 
 SymbolDef.prototype = {
     unmangleable: function(options) {
-        if (!options) options = {};
-
         return this.global && !options.toplevel
             || this.undeclared
             || !options.eval && this.scope.pinned()
@@ -198,24 +196,20 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
         }
         if (node instanceof AST_SymbolLambda) {
             var def = node.thedef;
-            if (def.orig.length == 1) {
             redefine(node, node.scope.parent_scope);
             node.thedef.init = def.init;
-            }
             return true;
         }
     }));
 
     function redefine(node, scope) {
         var name = node.name;
-        var refs = node.thedef.references;
+        var old_def = node.thedef;
-        var def = scope.find_variable(name) || self.globals.get(name) || scope.def_variable(node);
+        var new_def = scope.find_variable(name) || self.globals.get(name) || scope.def_variable(node);
-        refs.forEach(function(ref) {
+        old_def.orig.concat(old_def.references).forEach(function(node) {
-            ref.thedef = def;
+            node.thedef = new_def;
-            ref.reference(options);
-        });
-        node.thedef = def;
             node.reference(options);
+        });
     }
 });
 
@@ -300,7 +294,7 @@ AST_Scope.DEFMETHOD("def_variable", function(symbol, init) {
 
 AST_Lambda.DEFMETHOD("resolve", return_this);
 AST_Scope.DEFMETHOD("resolve", function() {
-    return this.parent_scope;
+    return this.parent_scope.resolve();
 });
 AST_Toplevel.DEFMETHOD("resolve", return_this);
 
@@ -337,7 +331,7 @@ function next_mangled_name(scope, options, def) {
         } while (scope = scope.parent_scope);
     });
     var name;
-    for (var i = 0, len = holes.length; i < len; i++) {
+    for (var i = 0; i < holes.length; i++) {
         name = base54(holes[i]);
         if (names[name]) continue;
         holes.splice(i, 1);
@@ -346,7 +340,7 @@ function next_mangled_name(scope, options, def) {
     }
     while (true) {
         name = base54(++scope.cname);
-        if (in_use[name] || !is_identifier(name) || options.reserved.has[name]) continue;
+        if (in_use[name] || RESERVED_WORDS[name] || options.reserved.has[name]) continue;
         if (!names[name]) break;
         holes.push(scope.cname);
     }
@@ -426,7 +420,7 @@ AST_Toplevel.DEFMETHOD("mangle_names", function(options) {
             var name;
             do {
                 name = base54(++lname);
-            } while (!is_identifier(name));
+            } while (RESERVED_WORDS[name]);
             node.mangled_name = name;
             return true;
         }
@@ -497,7 +491,7 @@ AST_Toplevel.DEFMETHOD("expand_names", function(options) {
         var name;
         do {
             name = base54(cname++);
-        } while (avoid[name] || !is_identifier(name));
+        } while (avoid[name] || RESERVED_WORDS[name]);
         return name;
     }
 
@@ -559,7 +553,7 @@ var base54 = (function() {
     var freq = Object.create(null);
     function init(chars) {
         var array = [];
-        for (var i = 0, len = chars.length; i < len; i++) {
+        for (var i = 0; i < chars.length; i++) {
             var ch = chars[i];
             array.push(ch);
             freq[ch] = -1e-2 * i;

package.json

@@ -3,7 +3,7 @@
   "description": "JavaScript parser, mangler/compressor and beautifier toolkit",
   "author": "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)",
   "license": "BSD-2-Clause",
-  "version": "3.5.1",
+  "version": "3.5.10",
   "engines": {
     "node": ">=0.8.0"
   },
@@ -23,12 +23,12 @@
     "LICENSE"
   ],
   "dependencies": {
-    "commander": "~2.19.0",
+    "commander": "~2.20.0",
     "source-map": "~0.6.1"
   },
   "devDependencies": {
     "acorn": "~6.1.1",
-    "semver": "~5.6.0"
+    "semver": "~6.0.0"
   },
   "scripts": {
     "test": "node test/run-tests.js"

test/compress/assignment.js

@@ -289,3 +289,25 @@ increment_decrement_2: {
     }
     expect_stdout: "42"
 }
+
+issue_3375: {
+    options = {
+        assignments: true,
+        reduce_vars: true,
+    }
+    input: {
+        console.log(typeof function(b) {
+            var a = b += 1;
+            --b;
+            return a;
+        }("object"));
+    }
+    expect: {
+        console.log(typeof function(b) {
+            var a = b += 1;
+            --b;
+            return a;
+        }("object"));
+    }
+    expect_stdout: "string"
+}

test/compress/collapse_vars.js

@@ -6157,3 +6157,24 @@ sub_property: {
     }
     expect_stdout: "PASS"
 }
+
+assign_undeclared: {
+    options = {
+        collapse_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var A = (console.log(42), function() {});
+        B = new A();
+        console.log(typeof B);
+    }
+    expect: {
+        B = new (console.log(42), function() {})();
+        console.log(typeof B);
+    }
+    expect_stdout: [
+        "42",
+        "object",
+    ]
+}

test/compress/comparisons.js

@@ -345,3 +345,38 @@ is_boolean_var: {
     }
     expect_stdout: "1"
 }
+
+is_defined: {
+    options = {
+        comparisons: true,
+    }
+    input: {
+        console.log(function a() {
+            return void 0 === a;
+        }());
+    }
+    expect: {
+        console.log(function a() {
+            return a, false;
+        }());
+    }
+    expect_stdout: "false"
+    expect_warnings: [
+        "WARN: Expression always defined [test/compress/comparisons.js:2,19]",
+    ]
+}
+
+unsafe_indexOf: {
+    options = {
+        booleans: true,
+        comparisons: true,
+        unsafe: true,
+    }
+    input: {
+        if (Object.keys({ foo: 42 }).indexOf("foo") >= 0) console.log("PASS");
+    }
+    expect: {
+        if (~Object.keys({ foo: 42 }).indexOf("foo")) console.log("PASS");
+    }
+    expect_stdout: "PASS"
+}

test/compress/conditionals.js

@@ -1416,3 +1416,58 @@ issue_3271: {
     }
     expect_stdout: "1 1"
 }
+
+iife_condition: {
+    options = {
+        conditionals: true,
+        side_effects: true,
+    }
+    input: {
+        if (function() {
+            return console;
+        }())
+            console.log("PASS");
+    }
+    expect: {
+        !function() {
+            return console;
+        }() || console.log("PASS");
+    }
+    expect_stdout: "PASS"
+}
+
+angularjs_chain: {
+    options = {
+        conditionals: true,
+        passes: 2,
+        side_effects: true,
+    }
+    input: {
+        function nonComputedMember(left, right, context, create) {
+            var lhs = left();
+            if (create && create !== 1) {
+                if (lhs && lhs[right] == null) {
+                    lhs[right] = {};
+                }
+            }
+            var value = lhs != null ? lhs[right] : undefined;
+            if (context) {
+                return { context: lhs, name: right, value: value };
+            } else {
+                return value;
+            }
+        }
+    }
+    expect: {
+        function nonComputedMember(left, right, context, create) {
+            var lhs = left();
+            create && 1 !== create && lhs && null == lhs[right] && (lhs[right] = {});
+            var value = null != lhs ? lhs[right] : void 0;
+            return context ? {
+                context: lhs,
+                name: right,
+                value: value
+            } : value;
+        }
+    }
+}

test/compress/dead-code.js

@@ -942,3 +942,21 @@ issue_2929: {
     }
     expect_stdout: "PASS"
 }
+
+unsafe_string_replace: {
+    options = {
+        side_effects: true,
+        unsafe: true,
+    }
+    input: {
+        "foo".replace("f", function() {
+            console.log("PASS");
+        });
+    }
+    expect: {
+        "foo".replace("f", function() {
+            console.log("PASS");
+        });
+    }
+    expect_stdout: "PASS"
+}

test/compress/drop-unused.js

@@ -2005,3 +2005,24 @@ issue_3233: {
     }
     expect_stdout: "PASS"
 }
+
+issue_3375: {
+    options = {
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var b = 1;
+        var a = c = [], c = --b + ("function" == typeof f && f());
+        var a = c && c[a];
+        console.log(a, b);
+    }
+    expect: {
+        var b = 1;
+        var a = [], c = --b + ("function" == typeof f && f());
+        a = c && c[a];
+        console.log(a, b);
+    }
+    expect_stdout: "0 0"
+}

test/compress/evaluate.js

@@ -246,7 +246,7 @@ unsafe_constant: {
     }
     expect: {
         console.log(
-            true.a,
+            void 0,
             false.a,
             null.a,
             (void 0).a
@@ -278,7 +278,7 @@ unsafe_object: {
             o + 1,
             2,
             o.b + 1,
-            1..b + 1
+            NaN
         );
     }
     expect_stdout: true
@@ -365,7 +365,7 @@ unsafe_object_repeated: {
             o + 1,
             2,
             o.b + 1,
-            1..b + 1
+            NaN
         );
     }
     expect_stdout: true
@@ -444,8 +444,8 @@ unsafe_integer_key: {
             2,
             2,
             ({0:1})[1] + 1,
-            1[1] + 1,
+            NaN,
-            1["1"] + 1
+            NaN
         );
     }
     expect_stdout: true
@@ -500,8 +500,8 @@ unsafe_float_key: {
             2,
             2,
             ({2.72:1})[3.14] + 1,
-            1[3.14] + 1,
+            NaN,
-            1["3.14"] + 1
+            NaN
         );
     }
     expect_stdout: true
@@ -635,12 +635,12 @@ unsafe_string_bad_index: {
     }
     expect: {
         console.log(
-            "1234".a + 1,
+            NaN,
-            "1234"["a"] + 1,
+            NaN,
-            "1234"[3.14] + 1
+            NaN
         );
     }
-    expect_stdout: true
+    expect_stdout: "NaN NaN NaN"
 }
 
 prototype_function: {
@@ -820,8 +820,8 @@ unsafe_charAt_noop: {
     }
     expect: {
         console.log(
-            s.charAt(0),
+            s[0],
-            "string".charAt(x),
+            "string"[0 | x],
             (typeof x)[0]
         );
     }
@@ -1124,14 +1124,14 @@ issue_2207_1: {
         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));
+        console.log(Math.pow(Math.PI, Math.E - Math.LN10).toFixed(15));
     }
     expect: {
         console.log("A");
         console.log(7);
         console.log(Math.cos(1.2345));
         console.log(1.2543732512566947);
-        console.log(1.6093984514472044);
+        console.log("1.609398451447204");
     }
     expect_stdout: true
 }
@@ -1687,3 +1687,73 @@ try_increment: {
     }
     expect_stdout: "1"
 }
+
+unsafe_escaped: {
+    options = {
+        evaluate: true,
+        inline: true,
+        passes: 3,
+        reduce_vars: true,
+        side_effects: true,
+        unsafe: true,
+        unused: true,
+    }
+    input: {
+        (function(a) {
+            console.log(function(index) {
+                return a[index];
+            }(function(term) {
+                return a.indexOf(term);
+            }("PASS")));
+        })([ "PASS" ]);
+    }
+    expect: {
+        console.log("PASS");
+    }
+    expect_stdout: "PASS"
+}
+
+unsafe_string_replace: {
+    options = {
+        evaluate: true,
+        unsafe: true,
+    }
+    input: {
+        "foo".replace("f", function() {
+            console.log("PASS");
+        });
+    }
+    expect: {
+        "foo".replace("f", function() {
+            console.log("PASS");
+        });
+    }
+    expect_stdout: "PASS"
+}
+
+issue_3387_1: {
+    options = {
+        evaluate: true,
+    }
+    input: {
+        console.log(1 + (2 + "3"[4]));
+    }
+    expect: {
+        console.log(1 + (2 + "3"[4]));
+    }
+    expect_stdout: "NaN"
+}
+
+issue_3387_2: {
+    options = {
+        evaluate: true,
+        unsafe: true,
+    }
+    input: {
+        console.log(1 + (2 + "3"[4]));
+    }
+    expect: {
+        console.log(NaN);
+    }
+    expect_stdout: "NaN"
+}

test/compress/functions.js

@@ -2703,3 +2703,365 @@ loop_inline: {
     }
     expect_stdout: "undefined"
 }
+
+functions: {
+    options = {
+        functions: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        !function() {
+            var a = function a() {
+                return a && "a";
+            };
+            var b = function x() {
+                return !!x;
+            };
+            var c = function(c) {
+                return c;
+            };
+            if (c(b(a()))) {
+                var d = function() {};
+                var e = function y() {
+                    return typeof y;
+                };
+                var f = function(f) {
+                    return f;
+                };
+                console.log(a(d()), b(e()), c(f(42)), typeof d, e(), typeof f);
+            }
+        }();
+    }
+    expect: {
+        !function() {
+            function a() {
+                return a && "a";
+            }
+            function b() {
+                return !!b;
+            }
+            var c = function(c) {
+                return c;
+            };
+            if (c(b(a()))) {
+                function d() {}
+                function e() {
+                    return typeof e;
+                }
+                var f = function(f) {
+                    return f;
+                };
+                console.log(a(d()), b(e()), c(f(42)), typeof d, e(), typeof f);
+            }
+        }();
+    }
+    expect_stdout: "a true 42 function function function"
+}
+
+functions_use_strict: {
+    options = {
+        functions: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        "use strict";
+        !function() {
+            var a = function a() {
+                return a && "a";
+            };
+            var b = function x() {
+                return !!x;
+            };
+            var c = function(c) {
+                return c;
+            };
+            if (c(b(a()))) {
+                var d = function() {};
+                var e = function y() {
+                    return typeof y;
+                };
+                var f = function(f) {
+                    return f;
+                };
+                console.log(a(d()), b(e()), c(f(42)), typeof d, e(), typeof f);
+            }
+        }();
+    }
+    expect: {
+        "use strict";
+        !function() {
+            function a() {
+                return a && "a";
+            }
+            function b() {
+                return !!b;
+            }
+            var c = function(c) {
+                return c;
+            };
+            if (c(b(a()))) {
+                var d = function() {};
+                var e = function y() {
+                    return typeof y;
+                };
+                var f = function(f) {
+                    return f;
+                };
+                console.log(a(d()), b(e()), c(f(42)), typeof d, e(), typeof f);
+            }
+        }();
+    }
+    expect_stdout: "a true 42 function function function"
+}
+
+issue_2437: {
+    options = {
+        collapse_vars: true,
+        conditionals: true,
+        functions: true,
+        inline: true,
+        join_vars: true,
+        passes: 2,
+        reduce_funcs: true,
+        reduce_vars: true,
+        sequences: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        function foo() {
+            return bar();
+        }
+        function bar() {
+            if (xhrDesc) {
+                var req = new XMLHttpRequest();
+                var result = !!req.onreadystatechange;
+                Object.defineProperty(XMLHttpRequest.prototype, 'onreadystatechange', xhrDesc || {});
+                return result;
+            } else {
+                var req = new XMLHttpRequest();
+                var detectFunc = function(){};
+                req.onreadystatechange = detectFunc;
+                var result = req[SYMBOL_FAKE_ONREADYSTATECHANGE_1] === detectFunc;
+                req.onreadystatechange = null;
+                return result;
+            }
+        }
+        console.log(foo());
+    }
+    expect: {
+        console.log(function() {
+            if (xhrDesc) {
+                var result = !!(req = new XMLHttpRequest()).onreadystatechange;
+                return Object.defineProperty(XMLHttpRequest.prototype, "onreadystatechange", xhrDesc || {}),
+                    result;
+            }
+            function detectFunc() {}
+            var req;
+            (req = new XMLHttpRequest()).onreadystatechange = detectFunc;
+            result = req[SYMBOL_FAKE_ONREADYSTATECHANGE_1] === detectFunc;
+            return req.onreadystatechange = null, result;
+        }());
+    }
+}
+
+issue_2485: {
+    options = {
+        functions: true,
+        reduce_funcs: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        var foo = function(bar) {
+            var n = function(a, b) {
+                return a + b;
+            };
+            var sumAll = function(arg) {
+                return arg.reduce(n, 0);
+            };
+            var runSumAll = function(arg) {
+                return sumAll(arg);
+            };
+            bar.baz = function(arg) {
+                var n = runSumAll(arg);
+                return (n.get = 1), n;
+            };
+            return bar;
+        };
+        var bar = foo({});
+        console.log(bar.baz([1, 2, 3]));
+    }
+    expect: {
+        var foo = function(bar) {
+            function n(a, b) {
+                return a + b;
+            }
+            function runSumAll(arg) {
+                return function(arg) {
+                    return arg.reduce(n, 0);
+                }(arg);
+            }
+            bar.baz = function(arg) {
+                var n = runSumAll(arg);
+                return (n.get = 1), n;
+            };
+            return bar;
+        };
+        var bar = foo({});
+        console.log(bar.baz([1, 2, 3]));
+    }
+    expect_stdout: "6"
+}
+
+issue_3364: {
+    options = {
+        functions: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    mangle = {}
+    input: {
+        var s = 2, a = 100, b = 10, c = 0;
+        function f(p, e, r) {
+            try {
+                for (var i = 1; i-- > 0;)
+                    var a = function(x) {
+                        function g(y) {
+                            y && y[a++];
+                        }
+                        var x = g(--s >= 0 && f(c++));
+                        for (var j = 1; --j > 0;);
+                    }();
+            } catch (e) {
+                try {
+                    return;
+                } catch (z) {
+                    for (var k = 1; --k > 0;) {
+                        for (var l = 1; l > 0; --l) {
+                            var n = function() {};
+                            for (var k in n)
+                                var o = (n, k);
+                        }
+                    }
+                }
+            }
+        }
+        var r = f();
+        console.log(c);
+    }
+    expect: {
+        var s = 2, c = 0;
+        (function n(r, o, a) {
+            try {
+                for (var f = 1; f-- >0;)
+                    var t = function(r) {
+                        (function(r) {
+                            r && r[t++];
+                        })(--s >= 0 && n(c++));
+                        for (var o = 1; --o > 0;);
+                    }();
+            } catch (o) {
+                try {
+                    return;
+                } catch (r) {
+                    for (var v = 1; --v > 0;)
+                        for (var i = 1; i > 0;--i) {
+                            function u() {}
+                            for (var v in u);
+                        }
+                }
+            }
+        })();
+        console.log(c);
+    }
+    expect_stdout: "2"
+}
+
+issue_3366: {
+    options = {
+        functions: true,
+        inline: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        function f() {
+            function g() {
+                return function() {};
+            }
+            var a = g();
+            (function() {
+                this && a && console.log("PASS");
+            })();
+        }
+        f();
+    }
+    expect: {
+        void function() {
+            this && a && console.log("PASS");
+        }();
+        function a() {}
+    }
+    expect_stdout: "PASS"
+}
+
+issue_3371: {
+    options = {
+        functions: true,
+        inline: true,
+        reduce_vars: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        (function() {
+            var a = function f() {
+                (function() {
+                    console.log(typeof f);
+                })();
+            };
+            while (a());
+        })();
+    }
+    expect: {
+        (function() {
+            function a() {
+                console.log(typeof a);
+            }
+            while (a());
+        })();
+    }
+    expect_stdout: "function"
+}
+
+class_iife: {
+    options = {
+        inline: true,
+        sequences: true,
+        toplevel: true,
+    }
+    input: {
+        var A = function() {
+            function B() {}
+            B.prototype.m = function() {
+                console.log("PASS");
+            };
+            return B;
+        }();
+        new A().m();
+    }
+    expect: {
+        var A = (B.prototype.m = function() {
+            console.log("PASS");
+        }, B);
+        function B() {}
+        new A().m();
+    }
+    expect_stdout: "PASS"
+}

test/compress/ie8.js

@@ -861,3 +861,111 @@ issue_3215_4: {
     }
     expect_stdout: "PASS"
 }
+
+issue_3355_1: {
+    mangle = {
+        ie8: false,
+    }
+    input: {
+        (function f() {
+            var f;
+        })();
+        (function g() {
+        })();
+        console.log(typeof f === typeof g);
+    }
+    expect: {
+        (function o() {
+            var o;
+        })();
+        (function o() {
+        })();
+        console.log(typeof f === typeof g);
+    }
+    expect_stdout: "true"
+}
+
+issue_3355_2: {
+    mangle = {
+        ie8: true,
+    }
+    input: {
+        (function f() {
+            var f;
+        })();
+        (function g() {
+        })();
+        console.log(typeof f === typeof g);
+    }
+    expect: {
+        (function f() {
+            var f;
+        })();
+        (function g() {
+        })();
+        console.log(typeof f === typeof g);
+    }
+    expect_stdout: "true"
+}
+
+issue_3355_3: {
+    mangle = {
+        ie8: false,
+    }
+    input: {
+        !function(a) {
+            "aaaaaaaaaa";
+            a();
+            var b = function c() {
+                var c = 42;
+                console.log("FAIL");
+            };
+        }(function() {
+            console.log("PASS");
+        });
+    }
+    expect: {
+        !function(a) {
+            "aaaaaaaaaa";
+            a();
+            var o = function a() {
+                var a = 42;
+                console.log("FAIL");
+            };
+        }(function() {
+            console.log("PASS");
+        });
+    }
+    expect_stdout: "PASS"
+}
+
+issue_3355_4: {
+    mangle = {
+        ie8: true,
+    }
+    input: {
+        !function(a) {
+            "aaaaaaaaaa";
+            a();
+            var b = function c() {
+                var c = 42;
+                console.log("FAIL");
+            };
+        }(function() {
+            console.log("PASS");
+        });
+    }
+    expect: {
+        !function(a) {
+            "aaaaaaaaaa";
+            a();
+            var o = function n() {
+                var n = 42;
+                console.log("FAIL");
+            };
+        }(function() {
+            console.log("PASS");
+        });
+    }
+    expect_stdout: "PASS"
+}

test/compress/issue-1034.js

@@ -59,7 +59,6 @@ non_hoisted_function_after_return_2a: {
         passes: 2,
         side_effects: true,
         unused: true,
-        warnings: "verbose",
     }
     input: {
         function foo(x) {
@@ -91,13 +90,13 @@ non_hoisted_function_after_return_2a: {
         "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:7,16]",
         "WARN: Dropping unused variable a [test/compress/issue-1034.js:4,20]",
         "WARN: Dropping unused function nope [test/compress/issue-1034.js:11,21]",
-        "WARN: pass 0: last_count: Infinity, count: 37",
+        "INFO: pass 0: last_count: Infinity, count: 37",
         "WARN: Dropping unreachable code [test/compress/issue-1034.js:9,12]",
         "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:9,12]",
         "WARN: Dropping unreachable code [test/compress/issue-1034.js:12,12]",
-        "WARN: Dropping unused variable b [test/compress/issue-1034.js:7,20]",
+        "INFO: Dropping unused variable b [test/compress/issue-1034.js:7,20]",
-        "WARN: Dropping unused variable c [test/compress/issue-1034.js:9,16]",
+        "INFO: Dropping unused variable c [test/compress/issue-1034.js:9,16]",
-        "WARN: pass 1: last_count: 37, count: 18",
+        "INFO: pass 1: last_count: 37, count: 18",
     ]
 }
 
@@ -213,7 +212,6 @@ non_hoisted_function_after_return_2a_strict: {
         passes: 2,
         side_effects: true,
         unused: true,
-        warnings: "verbose",
     }
     input: {
         "use strict";
@@ -250,13 +248,13 @@ non_hoisted_function_after_return_2a_strict: {
         "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:8,16]",
         "WARN: Dropping unused variable a [test/compress/issue-1034.js:5,20]",
         "WARN: Dropping unused function nope [test/compress/issue-1034.js:12,21]",
-        "WARN: pass 0: last_count: Infinity, count: 48",
+        "INFO: pass 0: last_count: Infinity, count: 48",
         "WARN: Dropping unreachable code [test/compress/issue-1034.js:10,12]",
         "WARN: Declarations in unreachable code! [test/compress/issue-1034.js:10,12]",
         "WARN: Dropping unreachable code [test/compress/issue-1034.js:13,12]",
-        "WARN: Dropping unused variable b [test/compress/issue-1034.js:8,20]",
+        "INFO: Dropping unused variable b [test/compress/issue-1034.js:8,20]",
-        "WARN: Dropping unused variable c [test/compress/issue-1034.js:10,16]",
+        "INFO: Dropping unused variable c [test/compress/issue-1034.js:10,16]",
-        "WARN: pass 1: last_count: 48, count: 29",
+        "INFO: pass 1: last_count: 48, count: 29",
     ]
 }
 

test/compress/issue-1639.js

@@ -1,4 +1,3 @@
-
 issue_1639_1: {
     options = {
         booleans: true,
@@ -12,7 +11,6 @@ issue_1639_1: {
     }
     input: {
         var a = 100, b = 10;
-
         var L1 = 5;
         while (--L1 > 0) {
             if ((--b), false) {
@@ -21,7 +19,6 @@ issue_1639_1: {
                 }
             }
         }
-
         console.log(a, b);
     }
     expect: {
@@ -29,7 +26,7 @@ issue_1639_1: {
             if (--b, 0) var ignore = 0;
         console.log(a, b);
     }
-    expect_stdout: true
+    expect_stdout: "100 6"
 }
 
 issue_1639_2: {
@@ -44,25 +41,23 @@ issue_1639_2: {
     }
     input: {
         var a = 100, b = 10;
-
         function f19() {
             if (++a, false)
                 if (a)
                     if (++a);
         }
         f19();
-
         console.log(a, b);
     }
     expect: {
         var a = 100, b = 10;
         function f19() {
-            ++a, 0;
+            ++a, 1;
         }
         f19(),
         console.log(a, b);
     }
-    expect_stdout: true
+    expect_stdout: "101 10"
 }
 
 issue_1639_3: {
@@ -84,5 +79,5 @@ issue_1639_3: {
         a++,
         console.log(a, b);
     }
-    expect_stdout: true
+    expect_stdout: "101 10"
 }

test/compress/loops.js

@@ -646,3 +646,30 @@ issue_2904: {
     }
     expect_stdout: "1"
 }
+
+issue_3371: {
+    options = {
+        functions: true,
+        join_vars: true,
+        loops: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function() {
+            var a = function() {
+                console.log("PASS");
+            };
+            while (a());
+        })();
+    }
+    expect: {
+        (function() {
+            function a() {
+                console.log("PASS");
+            }
+            for (; a(); );
+        })();
+    }
+    expect_stdout: "PASS"
+}

test/compress/properties.js

@@ -1862,3 +1862,29 @@ join_expr: {
     }
     expect_stdout: "PASS"
 }
+
+issue_3389: {
+    options = {
+        evaluate: true,
+        properties: true,
+        reduce_vars: true,
+        unsafe: true,
+    }
+    input: {
+        (function() {
+            var a = "PASS";
+            if (delete b)
+                b = a[null] = 42;
+            console.log(a);
+        })();
+    }
+    expect: {
+        (function() {
+            var a = "PASS";
+            if (delete b)
+                b = a.null = 42;
+            console.log(a);
+        })();
+    }
+    expect_stdout: "PASS"
+}

test/compress/reduce_vars.js

@@ -193,37 +193,34 @@ unsafe_evaluate: {
     }
     input: {
         function f0() {
-            var a = {
+            var a = { b: 1 };
-                b:1
-            };
             console.log(a.b + 3);
         }
-
         function f1() {
             var a = {
-                b:{
+                b: { c: 1 },
-                    c:1
-                },
                 d: 2
             };
             console.log(a.b + 3, a.d + 4, a.b.c + 5, a.d.c + 6);
         }
+        f0();
+        f1();
     }
     expect: {
         function f0() {
             console.log(4);
         }
-
         function f1() {
             var a = {
-                b:{
+                b: { c: 1 },
-                    c:1
-                },
                 d: 2
             };
-            console.log(a.b + 3, 6, 6, 2..c + 6);
+            console.log(a.b + 3, 6, 6, NaN);
         }
+        f0();
+        f1();
     }
+    expect_stdout: true
 }
 
 unsafe_evaluate_side_effect_free_1: {
@@ -281,8 +278,8 @@ unsafe_evaluate_escaped: {
         console.log(function(){ var o={p:3},a=[o]; console.log(a[0].p++); return o.p; }());
     }
     expect: {
-        console.log(function(){ var o={p:1}; console.log(o, o.p); return o.p; }());
+        console.log(function(){ var o={p:1}; console.log(o, 1); return o.p; }());
-        console.log(function(){ var o={p:2}; console.log(o.p, o); return o.p; }());
+        console.log(function(){ var o={p:2}; console.log(2, o); return o.p; }());
         console.log(function(){ var o={p:3},a=[o]; console.log(a[0].p++); return o.p; }());
     }
     expect_stdout: true
@@ -6737,3 +6734,21 @@ drop_side_effect_free: {
     }
     expect_stdout: "123"
 }
+
+issue_3377: {
+    options = {
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        console.log(function f() {
+            return f[0], (f = 42);
+        }());
+    }
+    expect: {
+        console.log(function f() {
+            return f[0], (f = 42);
+        }());
+    }
+    expect_stdout: "42"
+}

test/compress/sequences.js

@@ -702,7 +702,7 @@ side_effects_cascade_3: {
     }
     expect: {
         function f(a, b) {
-            !(b += a) && ((b = a) || (b -= a, b ^= a)),
+            (b += a) || (b = a) || (b -= a, b ^= a),
             a--;
         }
     }
@@ -964,3 +964,39 @@ missing_link: {
         console.log(a);
     }
 }
+
+angularjs_chain: {
+    options = {
+        conditionals: true,
+        sequences: true,
+        side_effects: true,
+    }
+    input: {
+        function nonComputedMember(left, right, context, create) {
+            var lhs = left();
+            if (create && create !== 1) {
+                if (lhs && lhs[right] == null) {
+                    lhs[right] = {};
+                }
+            }
+            var value = lhs != null ? lhs[right] : undefined;
+            if (context) {
+                return { context: lhs, name: right, value: value };
+            } else {
+                return value;
+            }
+        }
+    }
+    expect: {
+        function nonComputedMember(left, right, context, create) {
+            var lhs = left();
+            create && 1 !== create && lhs && null == lhs[right] && (lhs[right] = {});
+            var value = null != lhs ? lhs[right] : void 0;
+            return context ? {
+                context: lhs,
+                name: right,
+                value: value
+            } : value;
+        }
+    }
+}

test/exports.js

@@ -1,7 +1,5 @@
-exports["base54"] = base54;
 exports["Compressor"] = Compressor;
 exports["defaults"] = defaults;
-exports["is_identifier"] = is_identifier;
 exports["JS_Parse_Error"] = JS_Parse_Error;
 exports["mangle_properties"] = mangle_properties;
 exports["minify"] = minify;
@@ -9,7 +7,6 @@ exports["OutputStream"] = OutputStream;
 exports["parse"] = parse;
 exports["push_uniq"] = push_uniq;
 exports["reserve_quoted_keys"] = reserve_quoted_keys;
-exports["SourceMap"] = SourceMap;
 exports["string_template"] = string_template;
 exports["tokenizer"] = tokenizer;
 exports["TreeTransformer"] = TreeTransformer;

test/jetstream.js

@@ -3,7 +3,7 @@
 
 "use strict";
 
-var site = "https://browserbench.org/JetStream";
+var site = "https://browserbench.org/JetStream1.1";
 if (typeof phantom == "undefined") {
     require("../tools/exit");
     var args = process.argv.slice(2);

test/mocha/cli.js

@@ -47,7 +47,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should give sensible error against invalid input source map", function(done) {
-        var command = uglifyjscmd + " test/mocha.js --source-map content=blah,url=inline";
+        var command = uglifyjscmd + " test/mocha.js --source-map content=blah,url=inline --verbose";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.deepEqual(stderr.split(/\n/).slice(0, 2), [
@@ -83,6 +83,7 @@ describe("bin/uglifyjs", function() {
             "test/input/issue-2082/sample.js",
             "--source-map", "content=test/input/issue-2082/sample.js.map",
             "--source-map", "url=inline",
+            "--verbose",
         ].join(" ");
         exec(command, function(err, stdout, stderr) {
             if (err) throw err;
@@ -202,7 +203,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should warn for missing inline source map", function(done) {
-        var command = uglifyjscmd + " test/input/issue-1323/sample.js --source-map content=inline,url=inline";
+        var command = uglifyjscmd + " test/input/issue-1323/sample.js --source-map content=inline,url=inline --warn";
         exec(command, function(err, stdout, stderr) {
             if (err) throw err;
             assert.strictEqual(stdout, [
@@ -221,6 +222,7 @@ describe("bin/uglifyjs", function() {
             "test/input/issue-520/input.js",
             "test/input/issue-1323/sample.js",
             "--source-map", "content=inline,url=inline",
+            "--warn",
         ].join(" ");
         exec(command, function(err, stdout, stderr) {
             if (err) throw err;
@@ -647,7 +649,7 @@ describe("bin/uglifyjs", function() {
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.strictEqual(stdout, "");
-            assert.strictEqual(stderr, "Error parsing arguments for 'define': a-b\n");
+            assert.strictEqual(stderr, "ERROR: cannot parse arguments for 'define': a-b\n");
             done();
         });
     });

test/mocha/sourcemaps.js

@@ -118,32 +118,17 @@ describe("sourcemaps", function() {
             assert.strictEqual(result.code + "\n", readFileSync("test/input/issue-520/output.js", "utf8"));
         });
         it("Should warn for missing inline source map", function() {
-            var warn_function = UglifyJS.AST_Node.warn_function;
-            var warnings = [];
-            UglifyJS.AST_Node.warn_function = function(txt) {
-                warnings.push(txt);
-            };
-            try {
             var result = UglifyJS.minify(read("./test/input/issue-1323/sample.js"), {
                 mangle: false,
                 sourceMap: {
                     content: "inline"
-                    }
+                },
+                warnings: true,
             });
             assert.strictEqual(result.code, "var bar=function(bar){return bar};");
-                assert.strictEqual(warnings.length, 1);
+            assert.deepEqual(result.warnings, [ "WARN: inline source map not found: 0" ]);
-                assert.strictEqual(warnings[0], "inline source map not found: 0");
-            } finally {
-                UglifyJS.AST_Node.warn_function = warn_function;
-            }
         });
         it("Should handle multiple input and inline source map", function() {
-            var warn_function = UglifyJS.AST_Node.warn_function;
-            var warnings = [];
-            UglifyJS.AST_Node.warn_function = function(txt) {
-                warnings.push(txt);
-            };
-            try {
             var result = UglifyJS.minify([
                 read("./test/input/issue-520/input.js"),
                 read("./test/input/issue-1323/sample.js"),
@@ -151,18 +136,15 @@ describe("sourcemaps", function() {
                 sourceMap: {
                     content: "inline",
                     url: "inline",
-                    }
+                },
+                warnings: true,
             });
             if (result.error) throw result.error;
             assert.strictEqual(result.code, [
                 "var Foo=function(){console.log(3)};new Foo;var bar=function(o){return o};",
                 "//# sourceMappingURL=data:application/json;charset=utf-8;base64,eyJ2ZXJzaW9uIjozLCJzb3VyY2VzIjpbInN0ZGluIiwiMSJdLCJuYW1lcyI6WyJGb28iLCJjb25zb2xlIiwibG9nIiwiYmFyIl0sIm1hcHBpbmdzIjoiQUFBQSxJQUFNQSxJQUFJLFdBQWdCQyxRQUFRQyxJQUFJLElBQVMsSUFBSUYsSUNBbkQsSUFBSUcsSUFDQSxTQUFjQSxHQUNWLE9BQU9BIn0=",
             ].join("\n"));
-                assert.strictEqual(warnings.length, 1);
+            assert.deepEqual(result.warnings, [ "WARN: inline source map not found: 1" ]);
-                assert.strictEqual(warnings[0], "inline source map not found: 1");
-            } finally {
-                UglifyJS.AST_Node.warn_function = warn_function;
-            }
         });
         it("Should drop source contents for includeSources=false", function() {
             var result = UglifyJS.minify(read("./test/input/issue-520/input.js"), {

test/run-tests.js

@@ -231,16 +231,15 @@ function run_compress_tests() {
                 });
                 return false;
             }
-            var options = U.defaults(test.options, {
-                warnings: false
-            });
             var warnings_emitted = [];
-            var original_warn_function = U.AST_Node.warn_function;
             if (test.expect_warnings) {
-                U.AST_Node.warn_function = function(text) {
+                var expected_warnings = make_code(test.expect_warnings, {
-                    warnings_emitted.push("WARN: " + text);
+                    beautify: false,
-                };
+                    quote_style: 2, // force double quote to match JSON
-                if (!options.warnings) options.warnings = true;
+                });
+                U.AST_Node.log_function(function(text) {
+                    warnings_emitted.push(text);
+                }, /"INFO: /.test(expected_warnings));
             }
             if (test.mangle && test.mangle.properties && test.mangle.properties.keep_quoted) {
                 var quoted_props = test.mangle.properties.reserved;
@@ -252,7 +251,7 @@ function run_compress_tests() {
                 input.figure_out_scope(test.mangle);
                 input.expand_names(test.mangle);
             }
-            var cmp = new U.Compressor(options, true);
+            var cmp = new U.Compressor(test.options, true);
             var output = cmp.compress(input);
             output.figure_out_scope(test.mangle);
             if (test.mangle) {
@@ -283,11 +282,6 @@ function run_compress_tests() {
                 return false;
             }
             if (test.expect_warnings) {
-                U.AST_Node.warn_function = original_warn_function;
-                var expected_warnings = make_code(test.expect_warnings, {
-                    beautify: false,
-                    quote_style: 2, // force double quote to match JSON
-                });
                 warnings_emitted = warnings_emitted.map(function(input) {
                     return input.split(process.cwd() + path.sep).join("").split(path.sep).join("/");
                 });

test/sandbox.js

@@ -73,8 +73,10 @@ exports.run_code = function(code, reuse) {
         process.stdout.write = original_write;
         if (!reuse || code.indexOf(".prototype") >= 0) {
             context = null;
-        } else for (var key in context) {
+        } else {
-            delete context[key];
+            vm.runInContext(Object.keys(context).map(function(name) {
+                return "delete " + name;
+            }).join("\n"), context);
         }
     }
 };

tools/props.html

@@ -1,61 +1,540 @@
+<!doctype html>
 <html>
-  <head>
-  </head>
 <body>
-    <script>(function(){
+    <script>
-      var props = {};
+        !function() {
+            var names = [];
+            var scanned = [];
+            var to_scan = [];
 
-      function addObject(obj) {
+            function scan(obj) {
-        if (obj == null) return;
+                if (obj && typeof obj == "object" && !~scanned.indexOf(obj)) {
+                    scanned.push(obj);
+                    to_scan.push(obj);
+                }
+            }
+
+            scan(self);
+            [
+                "a",
+                "abbr",
+                "acronym",
+                "address",
+                "applet",
+                "area",
+                "article",
+                "aside",
+                "audio",
+                "b",
+                "base",
+                "basefont",
+                "bdi",
+                "bdo",
+                "bgsound",
+                "big",
+                "blink",
+                "blockquote",
+                "body",
+                "br",
+                "button",
+                "canvas",
+                "caption",
+                "center",
+                "checked",
+                "cite",
+                "code",
+                "col",
+                "colgroup",
+                "command",
+                "comment",
+                "compact",
+                "content",
+                "data",
+                "datalist",
+                "dd",
+                "declare",
+                "defer",
+                "del",
+                "details",
+                "dfn",
+                "dialog",
+                "dir",
+                "disabled",
+                "div",
+                "dl",
+                "dt",
+                "element",
+                "em",
+                "embed",
+                "fieldset",
+                "figcaption",
+                "figure",
+                "font",
+                "footer",
+                "form",
+                "frame",
+                "frameset",
+                "h1",
+                "h2",
+                "h3",
+                "h4",
+                "h5",
+                "h6",
+                "head",
+                "header",
+                "hgroup",
+                "hr",
+                "html",
+                "i",
+                "iframe",
+                "image",
+                "img",
+                "input",
+                "ins",
+                "isindex",
+                "ismap",
+                "kbd",
+                "keygen",
+                "label",
+                "legend",
+                "li",
+                "link",
+                "listing",
+                "main",
+                "map",
+                "mark",
+                "marquee",
+                "math",
+                "menu",
+                "menuitem",
+                "meta",
+                "meter",
+                "multicol",
+                "multiple",
+                "nav",
+                "nobr",
+                "noembed",
+                "noframes",
+                "nohref",
+                "noresize",
+                "noscript",
+                "noshade",
+                "nowrap",
+                "object",
+                "ol",
+                "optgroup",
+                "option",
+                "output",
+                "p",
+                "param",
+                "picture",
+                "plaintext",
+                "pre",
+                "progress",
+                "q",
+                "rb",
+                "readonly",
+                "rp",
+                "rt",
+                "rtc",
+                "ruby",
+                "s",
+                "samp",
+                "script",
+                "section",
+                "select",
+                "selected",
+                "shadow",
+                "small",
+                "source",
+                "spacer",
+                "span",
+                "strike",
+                "strong",
+                "style",
+                "sub",
+                "summary",
+                "sup",
+                "svg",
+                "table",
+                "tbody",
+                "td",
+                "template",
+                "textarea",
+                "tfoot",
+                "th",
+                "thead",
+                "time",
+                "title",
+                "tr",
+                "track",
+                "tt",
+                "u",
+                "ul",
+                "var",
+                "video",
+                "wbr",
+                "xmp",
+                "XXX",
+            ].forEach(function(tag) {
+                scan(document.createElement(tag));
+            });
+            [
+                "abort",
+                "absolutedeviceorientation",
+                "activate",
+                "active",
+                "addsourcebuffer",
+                "addstream",
+                "addtrack",
+                "afterprint",
+                "afterscriptexecute",
+                "afterupdate",
+                "animationcancel",
+                "animationend",
+                "animationiteration",
+                "animationstart",
+                "appinstalled",
+                "audioend",
+                "audioprocess",
+                "audiostart",
+                "autocomplete",
+                "autocompleteerror",
+                "auxclick",
+                "beforeactivate",
+                "beforecopy",
+                "beforecut",
+                "beforedeactivate",
+                "beforeeditfocus",
+                "beforeinstallprompt",
+                "beforepaste",
+                "beforeprint",
+                "beforescriptexecute",
+                "beforeunload",
+                "beforeupdate",
+                "blocked",
+                "blur",
+                "bounce",
+                "boundary",
+                "cached",
+                "cancel",
+                "candidatewindowhide",
+                "candidatewindowshow",
+                "candidatewindowupdate",
+                "canplay",
+                "canplaythrough",
+                "cellchange",
+                "change",
+                "chargingchange",
+                "chargingtimechange",
+                "checking",
+                "click",
+                "close",
+                "compassneedscalibration",
+                "complete",
+                "connect",
+                "connecting",
+                "connectionstatechange",
+                "contextmenu",
+                "controllerchange",
+                "controlselect",
+                "copy",
+                "cuechange",
+                "cut",
+                "dataavailable",
+                "datachannel",
+                "datasetchanged",
+                "datasetcomplete",
+                "dblclick",
+                "deactivate",
+                "devicechange",
+                "devicelight",
+                "devicemotion",
+                "deviceorientation",
+                "deviceorientationabsolute",
+                "deviceproximity",
+                "dischargingtimechange",
+                "disconnect",
+                "display",
+                "downloading",
+                "drag",
+                "dragend",
+                "dragenter",
+                "dragexit",
+                "dragleave",
+                "dragover",
+                "dragstart",
+                "drop",
+                "durationchange",
+                "emptied",
+                "encrypted",
+                "end",
+                "ended",
+                "enter",
+                "enterpictureinpicture",
+                "error",
+                "errorupdate",
+                "exit",
+                "filterchange",
+                "finish",
+                "focus",
+                "focusin",
+                "focusout",
+                "freeze",
+                "fullscreenchange",
+                "fullscreenerror",
+                "gesturechange",
+                "gestureend",
+                "gesturestart",
+                "gotpointercapture",
+                "hashchange",
+                "help",
+                "icecandidate",
+                "iceconnectionstatechange",
+                "icegatheringstatechange",
+                "inactive",
+                "input",
+                "invalid",
+                "keydown",
+                "keypress",
+                "keyup",
+                "languagechange",
+                "layoutcomplete",
+                "leavepictureinpicture",
+                "levelchange",
+                "load",
+                "loadeddata",
+                "loadedmetadata",
+                "loadend",
+                "loading",
+                "loadingdone",
+                "loadingerror",
+                "loadstart",
+                "losecapture",
+                "lostpointercapture",
+                "mark",
+                "message",
+                "messageerror",
+                "mousedown",
+                "mouseenter",
+                "mouseleave",
+                "mousemove",
+                "mouseout",
+                "mouseover",
+                "mouseup",
+                "mousewheel",
+                "move",
+                "moveend",
+                "movestart",
+                "mozfullscreenchange",
+                "mozfullscreenerror",
+                "mozorientationchange",
+                "mozpointerlockchange",
+                "mozpointerlockerror",
+                "mscontentzoom",
+                "msfullscreenchange",
+                "msfullscreenerror",
+                "msgesturechange",
+                "msgesturedoubletap",
+                "msgestureend",
+                "msgesturehold",
+                "msgesturestart",
+                "msgesturetap",
+                "msgotpointercapture",
+                "msinertiastart",
+                "mslostpointercapture",
+                "msmanipulationstatechanged",
+                "msneedkey",
+                "msorientationchange",
+                "mspointercancel",
+                "mspointerdown",
+                "mspointerenter",
+                "mspointerhover",
+                "mspointerleave",
+                "mspointermove",
+                "mspointerout",
+                "mspointerover",
+                "mspointerup",
+                "mssitemodejumplistitemremoved",
+                "msthumbnailclick",
+                "negotiationneeded",
+                "nomatch",
+                "noupdate",
+                "obsolete",
+                "offline",
+                "online",
+                "open",
+                "orientationchange",
+                "pagechange",
+                "pagehide",
+                "pageshow",
+                "paste",
+                "pause",
+                "play",
+                "playing",
+                "pluginstreamstart",
+                "pointercancel",
+                "pointerdown",
+                "pointerenter",
+                "pointerleave",
+                "pointerlockchange",
+                "pointerlockerror",
+                "pointermove",
+                "pointerout",
+                "pointerover",
+                "pointerup",
+                "popstate",
+                "progress",
+                "propertychange",
+                "ratechange",
+                "reading",
+                "readystatechange",
+                "rejectionhandled",
+                "removesourcebuffer",
+                "removestream",
+                "removetrack",
+                "reset",
+                "resize",
+                "resizeend",
+                "resizestart",
+                "resourcetimingbufferfull",
+                "result",
+                "resume",
+                "rowenter",
+                "rowexit",
+                "rowsdelete",
+                "rowsinserted",
+                "scroll",
+                "search",
+                "seeked",
+                "seeking",
+                "select",
+                "selectionchange",
+                "selectstart",
+                "show",
+                "signalingstatechange",
+                "soundend",
+                "soundstart",
+                "sourceclose",
+                "sourceclosed",
+                "sourceended",
+                "sourceopen",
+                "speechend",
+                "speechstart",
+                "stalled",
+                "start",
+                "statechange",
+                "stop",
+                "storage",
+                "storagecommit",
+                "submit",
+                "success",
+                "suspend",
+                "textinput",
+                "timeout",
+                "timeupdate",
+                "toggle",
+                "touchcancel",
+                "touchend",
+                "touchmove",
+                "touchstart",
+                "track",
+                "transitioncancel",
+                "transitionend",
+                "transitionrun",
+                "transitionstart",
+                "unhandledrejection",
+                "unload",
+                "updateready",
+                "upgradeneeded",
+                "userproximity",
+                "versionchange",
+                "visibilitychange",
+                "voiceschanged",
+                "volumechange",
+                "vrdisplayactivate",
+                "vrdisplayconnect",
+                "vrdisplaydeactivate",
+                "vrdisplaydisconnect",
+                "vrdisplaypresentchange",
+                "waiting",
+                "waitingforkey",
+                "warning",
+                "webkitanimationend",
+                "webkitanimationiteration",
+                "webkitanimationstart",
+                "webkitcurrentplaybacktargetiswirelesschanged",
+                "webkitfullscreenchange",
+                "webkitfullscreenerror",
+                "webkitkeyadded",
+                "webkitkeyerror",
+                "webkitkeymessage",
+                "webkitneedkey",
+                "webkitorientationchange",
+                "webkitplaybacktargetavailabilitychanged",
+                "webkitpointerlockchange",
+                "webkitpointerlockerror",
+                "webkitresourcetimingbufferfull",
+                "webkittransitionend",
+                "wheel",
+                "zoom",
+            ].forEach(function(type) {
+                [
+                    "beforeunloadevent",
+                    "compositionevent",
+                    "customevent",
+                    "devicemotionevent",
+                    "deviceorientationevent",
+                    "dragevent",
+                    "event",
+                    "events",
+                    "focusevent",
+                    "hashchangeevent",
+                    "htmlevents",
+                    "keyboardevent",
+                    "messageevent",
+                    "mouseevent",
+                    "mouseevents",
+                    "storageevent",
+                    "svgevents",
+                    "textevent",
+                    "touchevent",
+                    "uievent",
+                    "uievents",
+                ].forEach(function(interface) {
                     try {
-          Object.getOwnPropertyNames(obj).forEach(add);
+                        var event = document.createEvent(interface);
-        } catch(ex) {}
+                        event.initEvent(type, true, true);
-        if (obj.prototype) {
+                        scan(event);
-          Object.getOwnPropertyNames(obj.prototype).forEach(add);
+                    } catch (e) {}
-        }
+                });
-        if (typeof obj == "function") {
-          try {
-            Object.getOwnPropertyNames(new obj).forEach(add);
-          } catch(ex) {}
-        }
-      }
-
-      function add(name) {
-        props[name] = true;
-      }
-
-      Object.getOwnPropertyNames(window).forEach(function(thing){
-        addObject(window[thing]);
             });
 
+            var obj;
+            while (obj = to_scan.shift()) {
+                var proto = obj;
+                do {
+                    Object.getOwnPropertyNames(proto).forEach(function(name) {
+                        var visited = ~names.indexOf(name);
+                        if (!visited) names.push(name);
                         try {
-        addObject(new Event("click"));
+                            scan(obj[name]);
-        addObject(new Event("contextmenu"));
+                            if (visited) return;
-        addObject(new Event("mouseup"));
+                            if (/^create/.test(name)) {
-        addObject(new Event("mousedown"));
+                                scan(obj[name]());
-        addObject(new Event("keydown"));
-        addObject(new Event("keypress"));
-        addObject(new Event("keyup"));
-      } catch(ex) {}
-
-      var ta = document.createElement("textarea");
-      ta.style.width = "100%";
-      ta.style.height = "20em";
-      ta.style.boxSizing = "border-box";
-      <!-- ta.value = Object.keys(props).sort(cmp).map(function(name){ -->
-      <!--   return JSON.stringify(name); -->
-      <!-- }).join(",\n"); -->
-      ta.value = JSON.stringify({
-        vars: [],
-        props: Object.keys(props).sort(cmp)
-      }, null, 2);
-      document.body.appendChild(ta);
-
-      function cmp(a, b) {
-        a = a.toLowerCase();
-        b = b.toLowerCase();
-        return a < b ? -1 : a > b ? 1 : 0;
                             }
-    })();</script>
+                            if (/^[A-Z]/.test(name)) {
+                                scan(new obj[name]());
+                            }
+                        } catch (e) {}
+                    });
+                } while (proto = Object.getPrototypeOf(proto));
+            }
+            names.sort();
+            document.write('<pre>[\n    "');
+            document.write(names.join('",\n    "'));
+            document.write('"\n]</pre>');
+        }();
+    </script>
 </body>
 </html>