v3.10.2

fixes #4059

.github/workflows/ci.yml

@@ -1,5 +1,8 @@
 name: CI
-on: [ push, pull_request ]
+on:
+  pull_request:
+  push:
+    branches: [ master ]
 jobs:
   test:
     strategy:
@@ -19,7 +22,7 @@ jobs:
       TYPE: ${{ matrix.script }}
     steps:
       - uses: actions/checkout@v2
-      - uses: actions/cache@v1
+      - uses: actions/cache@v2
         with:
           path: tmp
           key: tmp ${{ matrix.script }}

.github/workflows/ufuzz.yml

@@ -2,7 +2,11 @@ name: Fuzzing
 on:
   pull_request:
   schedule:
-    - cron: "*/8 * * * *"
+    - cron: "*/5 * * * *"
+env:
+  BASE_URL: https://api.github.com/repos/${{ github.repository }}
+  CAUSE: ${{ github.event_name }}
+  TOKEN: ${{ github.token }}
 jobs:
   ufuzz:
     strategy:
@@ -32,4 +36,12 @@ jobs:
           npm config set update-notifier false
           npm --version
           while !(npm install); do echo "'npm install' failed - retrying..."; done
-          node test/ufuzz/job 3600000
+          PERIOD=1800000
+          if [[ $CAUSE == "schedule" ]]; then
+            PERIOD=`node test/ufuzz/actions $BASE_URL $TOKEN`
+          fi
+          if (( $PERIOD == 0 )); then
+            echo "too many jobs in queue - skipping..."
+          else
+            node test/ufuzz/job $PERIOD
+          fi

README.md

@@ -212,17 +212,16 @@ Example:
 To enable the mangler you need to pass `--mangle` (`-m`).  The following
 (comma-separated) options are supported:
 
-- `toplevel` (default `false`) -- mangle names declared in the top level scope.
+- `eval` (default `false`) -- mangle names visible in scopes where `eval` or
+  `with` are used.
 
-- `eval` (default `false`) -- mangle names visible in scopes where `eval` or `with` are used.
+- `reserved` (default: `[]`) -- when mangling is enabled but you want to
+  prevent certain names from being mangled, you can declare those names with
+  `--mangle reserved` — pass a comma-separated list of names.  For example:
 
-When mangling is enabled but you want to prevent certain names from being
-mangled, you can declare those names with `--mangle reserved` — pass a
-comma-separated list of names.  For example:
+      uglifyjs ... -m reserved=['$','require','exports']
 
-    uglifyjs ... -m reserved=['$','require','exports']
-
-to prevent the `require`, `exports` and `$` names from being changed.
+  to prevent the `require`, `exports` and `$` names from being changed.
 
 ### CLI mangling property names (`--mangle-props`)
 
@@ -657,8 +656,8 @@ to be `false` and all symbol names will be omitted.
 - `hoist_props` (default: `true`) -- hoist properties from constant object and
   array literals into regular variables subject to a set of constraints. For example:
   `var o={p:1, q:2}; f(o.p, o.q);` is converted to `f(1, 2);`. Note: `hoist_props`
-  works best with `mangle` enabled, the `compress` option `passes` set to `2` or higher,
-  and the `compress` option `toplevel` enabled.
+  works best with `toplevel` and `mangle` enabled, alongside with `compress` option
+  `passes` set to `2` or higher.
 
 - `hoist_vars` (default: `false`) -- hoist `var` declarations (this is `false`
   by default because it seems to increase the size of the output in general)
@@ -1157,3 +1156,19 @@ To allow for better optimizations, the compiler makes various assumptions:
 - Object properties can be added, removed and modified (not prevented with
   `Object.defineProperty()`, `Object.defineProperties()`, `Object.freeze()`,
   `Object.preventExtensions()` or `Object.seal()`).
+- When `toplevel` is enabled, UglifyJS effectively assumes input code is wrapped
+  within `function(){ ... }`, thus forbids aliasing of declared global variables:
+  ```js
+  A = "FAIL";
+  var B = "FAIL";
+  // can be `global`, `self`, `window` etc.
+  var top = function() {
+      return this;
+  }();
+  // "PASS"
+  top.A = "PASS";
+  console.log(A);
+  // "FAIL" after compress and/or mangle
+  top.B = "PASS";
+  console.log(B);
+  ```

lib/compress.js

@@ -167,7 +167,7 @@ merge(Compressor.prototype, {
         if (def.global) for (var i = 0; i < def.orig.length; i++)
             if (!this.toplevel[def.orig[i] instanceof AST_SymbolDefun ? "funcs" : "vars"])
                 return true;
-        return false;
+        return def.undeclared;
     },
     compress: function(node) {
         node = node.resolve_defines(this);
@@ -1386,6 +1386,7 @@ merge(Compressor.prototype, {
                     var scan_lhs = lhs && !side_effects && !is_lhs_read_only(lhs, compressor);
                     var scan_rhs = foldable(candidate);
                     if (!scan_lhs && !scan_rhs) continue;
+                    var read_toplevel = false;
                     var modify_toplevel = false;
                     // Locate symbols which may execute code outside of scanning range
                     var lvalues = get_lvalues(candidate);
@@ -1548,8 +1549,9 @@ merge(Compressor.prototype, {
                     return lvalues.has(node.name.name) || side_effects && may_modify(node.name);
                 }
                 var sym = is_lhs(node.left, node);
-                if (sym && lvalues.has(sym.name)) return true;
                 if (sym instanceof AST_PropAccess) return true;
+                if (!(sym instanceof AST_SymbolRef)) return false;
+                return lvalues.has(sym.name) || read_toplevel && compressor.exposed(sym.definition());
             }
 
             function extract_args() {
@@ -1832,7 +1834,9 @@ merge(Compressor.prototype, {
                 if (parent instanceof AST_SimpleStatement) return find_stop_unused(parent, level + 1);
                 if (parent instanceof AST_Switch) return find_stop_unused(parent, level + 1);
                 if (parent instanceof AST_Unary) return find_stop_unused(parent, level + 1);
-                if (parent instanceof AST_VarDef) return find_stop_unused(parent, level + 1);
+                if (parent instanceof AST_VarDef) {
+                    return may_throw(parent) ? node : find_stop_unused(parent, level + 1);
+                }
                 return null;
             }
 
@@ -1936,19 +1940,21 @@ merge(Compressor.prototype, {
                 };
             }
 
+            function may_be_global(node) {
+                if (node instanceof AST_SymbolRef) {
+                    node = node.fixed_value();
+                    if (!node) return true;
+                }
+                if (node instanceof AST_Assign) return node.operator == "=" && may_be_global(node.right);
+                return node instanceof AST_PropAccess || node instanceof AST_This;
+            }
+
             function get_lvalues(expr) {
                 var lvalues = new Dictionary();
-                if (candidate instanceof AST_VarDef) lvalues.add(candidate.name.name, lhs);
-                var scan_iife = scope instanceof AST_Toplevel;
+                if (expr instanceof AST_VarDef) lvalues.add(expr.name.name, lhs);
+                var find_arguments = scope.uses_arguments && !compressor.has_directive("use strict");
+                var scan_toplevel = scope instanceof AST_Toplevel;
                 var tw = new TreeWalker(function(node) {
-                    if (scan_iife && node.TYPE == "Call") {
-                        var exp = node.expression;
-                        if (exp instanceof AST_PropAccess) return;
-                        if (exp instanceof AST_Function && !exp.contains_this()) return;
-                        modify_toplevel = true;
-                        scan_iife = false;
-                        return;
-                    }
                     var value;
                     if (node instanceof AST_SymbolRef) {
                         value = node.fixed_value() || node;
@@ -1956,6 +1962,28 @@ merge(Compressor.prototype, {
                         value = node;
                     }
                     if (value) lvalues.add(node.name, is_modified(compressor, tw, node, value, 0));
+                    if (find_arguments && node instanceof AST_Sub) {
+                        scope.argnames.forEach(function(argname) {
+                            if (!compressor.option("reduce_vars") || argname.definition().assignments) {
+                                lvalues.add(argname.name, true);
+                            }
+                        });
+                        find_arguments = false;
+                    }
+                    if (!scan_toplevel) return;
+                    if (node.TYPE == "Call") {
+                        if (modify_toplevel) return;
+                        var exp = node.expression;
+                        if (exp instanceof AST_PropAccess) return;
+                        if (exp instanceof AST_Function && !exp.contains_this()) return;
+                        modify_toplevel = true;
+                    } else if (node instanceof AST_PropAccess && may_be_global(node.expression)) {
+                        if (node === lhs && !(expr instanceof AST_Unary)) {
+                            modify_toplevel = true;
+                        } else {
+                            read_toplevel = true;
+                        }
+                    }
                 });
                 expr.walk(tw);
                 return lvalues;
@@ -1965,9 +1993,12 @@ merge(Compressor.prototype, {
                 if (expr.name instanceof AST_SymbolFunarg) {
                     var index = compressor.self().argnames.indexOf(expr.name);
                     var args = compressor.parent().args;
-                    if (args[index]) args[index] = make_node(AST_Number, args[index], {
-                        value: 0
-                    });
+                    if (args[index]) {
+                        args[index] = make_node(AST_Number, args[index], {
+                            value: 0
+                        });
+                        expr.name.definition().fixed = false;
+                    }
                     return true;
                 }
                 var end = hit_stack.length - 1;
@@ -5892,28 +5923,57 @@ merge(Compressor.prototype, {
         }
         body[0].body = decl.concat(body[0].body);
         self.body = body;
-        if (body.length == 1 && (body[0] === exact_match || body[0] === default_branch)) {
-            var has_break = false;
-            var tw = new TreeWalker(function(node) {
-                if (has_break
-                    || node instanceof AST_Lambda
-                    || node instanceof AST_SimpleStatement) return true;
-                if (is_break(node, tw)) has_break = true;
+        if (compressor.option("conditionals")) switch (body.length) {
+          case 1:
+            if (!no_break(body[0])) break;
+            var exp = body[0].expression;
+            var statements = body[0].body.slice();
+            if (body[0] !== default_branch && body[0] !== exact_match) return make_node(AST_If, self, {
+                condition: make_node(AST_Binary, self, {
+                    operator: "===",
+                    left: self.expression,
+                    right: exp,
+                }),
+                body: make_node(AST_BlockStatement, self, {
+                    body: statements,
+                }),
+                alternative: null,
+            }).optimize(compressor);
+            if (exp) statements.unshift(make_node(AST_SimpleStatement, exp, {
+                body: exp,
+            }));
+            statements.unshift(make_node(AST_SimpleStatement, self.expression, {
+                body:self.expression,
+            }));
+            return make_node(AST_BlockStatement, self, {
+                body: statements,
+            }).optimize(compressor);
+          case 2:
+            if (!member(default_branch, body) || !no_break(body[1])) break;
+            var statements = body[0].body.slice();
+            var exclusive = statements.length && is_break(statements[statements.length - 1], compressor);
+            if (exclusive) statements.pop();
+            if (!all(statements, no_break)) break;
+            var alternative = body[1].body.length && make_node(AST_BlockStatement, body[1], body[1]);
+            var node = make_node(AST_If, self, {
+                condition: make_node(AST_Binary, self, body[0] === default_branch ? {
+                    operator: "!==",
+                    left: self.expression,
+                    right: body[1].expression,
+                } : {
+                    operator: "===",
+                    left: self.expression,
+                    right: body[0].expression,
+                }),
+                body: make_node(AST_BlockStatement, body[0], {
+                    body: statements,
+                }),
+                alternative: exclusive && alternative || null,
             });
-            self.walk(tw);
-            if (!has_break) {
-                var statements = body[0].body.slice();
-                var exp = body[0].expression;
-                if (exp) statements.unshift(make_node(AST_SimpleStatement, exp, {
-                    body: exp
-                }));
-                statements.unshift(make_node(AST_SimpleStatement, self.expression, {
-                    body:self.expression
-                }));
-                return make_node(AST_BlockStatement, self, {
-                    body: statements
-                }).optimize(compressor);
-            }
+            if (!exclusive && alternative) node = make_node(AST_BlockStatement, self, {
+                body: [ node, alternative ],
+            });
+            return node.optimize(compressor);
         }
         return self;
 
@@ -5921,6 +5981,19 @@ merge(Compressor.prototype, {
             return node instanceof AST_Break && tw.loopcontrol_target(node) === self;
         }
 
+        function no_break(node) {
+            var found = false;
+            var tw = new TreeWalker(function(node) {
+                if (found
+                    || node instanceof AST_Lambda
+                    || node instanceof AST_SimpleStatement) return true;
+                if (is_break(node, tw)) found = true;
+            });
+            tw.push(self);
+            node.walk(tw);
+            return !found;
+        }
+
         function eliminate_branch(branch, prev) {
             if (prev && !aborts(prev)) {
                 prev.body = prev.body.concat(branch.body);
@@ -7039,7 +7112,7 @@ merge(Compressor.prototype, {
                 && self.right instanceof AST_SymbolRef
                 && self.left.definition() === self.right.definition()
                 && is_object(self.left)) {
-                return make_node(self.operator[0] == "=" ? AST_True : AST_False, self);
+                return make_node(self.operator[0] == "=" ? AST_True : AST_False, self).optimize(compressor);
             }
             break;
           case "&&":
@@ -7436,56 +7509,58 @@ merge(Compressor.prototype, {
                 }
                 break;
             }
-            if (self.left instanceof AST_Number && !self.right.is_constant()) switch (self.operator) {
-              // 0 + n => n
-              case "+":
-                if (self.left.value == 0) {
-                    if (self.right.is_boolean(compressor)) return make_node(AST_UnaryPrefix, self, {
-                        operator: "+",
-                        expression: self.right
-                    }).optimize(compressor);
-                    if (self.right.is_number(compressor) && !self.right.is_negative_zero()) return self.right;
+            if (!(parent instanceof AST_UnaryPrefix && parent.operator == "delete")) {
+                if (self.left instanceof AST_Number && !self.right.is_constant()) switch (self.operator) {
+                  // 0 + n => n
+                  case "+":
+                    if (self.left.value == 0) {
+                        if (self.right.is_boolean(compressor)) return make_node(AST_UnaryPrefix, self, {
+                            operator: "+",
+                            expression: self.right
+                        }).optimize(compressor);
+                        if (self.right.is_number(compressor) && !self.right.is_negative_zero()) return self.right;
+                    }
+                    break;
+                  // 1 * n => n
+                  case "*":
+                    if (self.left.value == 1) {
+                        return self.right.is_number(compressor) ? self.right : make_node(AST_UnaryPrefix, self, {
+                            operator: "+",
+                            expression: self.right
+                        }).optimize(compressor);
+                    }
+                    break;
                 }
-                break;
-              // 1 * n => n
-              case "*":
-                if (self.left.value == 1) {
-                    return self.right.is_number(compressor) ? self.right : make_node(AST_UnaryPrefix, self, {
-                        operator: "+",
-                        expression: self.right
-                    }).optimize(compressor);
+                if (self.right instanceof AST_Number && !self.left.is_constant()) switch (self.operator) {
+                  // n + 0 => n
+                  case "+":
+                    if (self.right.value == 0) {
+                        if (self.left.is_boolean(compressor)) return make_node(AST_UnaryPrefix, self, {
+                            operator: "+",
+                            expression: self.left
+                        }).optimize(compressor);
+                        if (self.left.is_number(compressor) && !self.left.is_negative_zero()) return self.left;
+                    }
+                    break;
+                  // n - 0 => n
+                  case "-":
+                    if (self.right.value == 0) {
+                        return self.left.is_number(compressor) ? self.left : make_node(AST_UnaryPrefix, self, {
+                            operator: "+",
+                            expression: self.left
+                        }).optimize(compressor);
+                    }
+                    break;
+                  // n / 1 => n
+                  case "/":
+                    if (self.right.value == 1) {
+                        return self.left.is_number(compressor) ? self.left : make_node(AST_UnaryPrefix, self, {
+                            operator: "+",
+                            expression: self.left
+                        }).optimize(compressor);
+                    }
+                    break;
                 }
-                break;
-            }
-            if (self.right instanceof AST_Number && !self.left.is_constant()) switch (self.operator) {
-              // n + 0 => n
-              case "+":
-                if (self.right.value == 0) {
-                    if (self.left.is_boolean(compressor)) return make_node(AST_UnaryPrefix, self, {
-                        operator: "+",
-                        expression: self.left
-                    }).optimize(compressor);
-                    if (self.left.is_number(compressor) && !self.left.is_negative_zero()) return self.left;
-                }
-                break;
-              // n - 0 => n
-              case "-":
-                if (self.right.value == 0) {
-                    return self.left.is_number(compressor) ? self.left : make_node(AST_UnaryPrefix, self, {
-                        operator: "+",
-                        expression: self.left
-                    }).optimize(compressor);
-                }
-                break;
-              // n / 1 => n
-              case "/":
-                if (self.right.value == 1) {
-                    return self.left.is_number(compressor) ? self.left : make_node(AST_UnaryPrefix, self, {
-                        operator: "+",
-                        expression: self.left
-                    }).optimize(compressor);
-                }
-                break;
             }
         }
         if (compressor.option("typeofs")) switch (self.operator) {
@@ -7896,12 +7971,17 @@ merge(Compressor.prototype, {
                     }
                 }
             } else if (self.left instanceof AST_SymbolRef) {
-                if (self.operator == "=" && self.left.equivalent_to(self.right)) return self.right;
+                var parent;
+                if (self.operator == "=" && self.left.equivalent_to(self.right)
+                    && !((parent = compressor.parent()) instanceof AST_UnaryPrefix && parent.operator == "delete")) {
+                    return self.right;
+                }
                 if (self.left.is_immutable()) return strip_assignment();
                 var def = self.left.definition();
                 var scope = def.scope.resolve();
                 var local = scope === compressor.find_parent(AST_Lambda);
-                var level = 0, node, parent = self;
+                var level = 0, node;
+                parent = self;
                 do {
                     node = parent;
                     parent = compressor.parent(level++);

lib/minify.js

@@ -197,9 +197,7 @@ function minify(files, options) {
             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 (options.mangle && options.mangle.properties) mangle_properties(toplevel, options.mangle.properties);
         if (timings) timings.output = Date.now();
         var result = {};
         if (options.output.ast) {

lib/output.js

@@ -1174,10 +1174,7 @@ function OutputStream(options) {
     });
 
     /* -----[ other expressions ]----- */
-    DEFPRINT(AST_Call, function(self, output) {
-        self.expression.print(output);
-        if (self instanceof AST_New && !need_constructor_parens(self, output))
-            return;
+    function print_call_args(self, output) {
         if (self.expression instanceof AST_Call || self.expression instanceof AST_Lambda) {
             output.add_mapping(self.start);
         }
@@ -1187,11 +1184,16 @@ function OutputStream(options) {
                 expr.print(output);
             });
         });
+    }
+    DEFPRINT(AST_Call, function(self, output) {
+        self.expression.print(output);
+        print_call_args(self, output);
     });
     DEFPRINT(AST_New, function(self, output) {
         output.print("new");
         output.space();
-        AST_Call.prototype._codegen(self, output);
+        self.expression.print(output);
+        if (need_constructor_parens(self, output)) print_call_args(self, output);
     });
     DEFPRINT(AST_Sequence, function(self, output) {
         self.expressions.forEach(function(node, index) {

lib/parse.js

@@ -1092,7 +1092,7 @@ function parse($TEXT, options) {
 
     function switch_body_() {
         expect("{");
-        var a = [], cur = null, branch = null, tmp;
+        var a = [], branch, cur, default_branch, tmp;
         while (!is("punc", "}")) {
             if (is("eof")) expect_token("punc", "}");
             if (is("keyword", "case")) {
@@ -1107,12 +1107,14 @@ function parse($TEXT, options) {
                 expect(":");
             } else if (is("keyword", "default")) {
                 if (branch) branch.end = prev();
+                if (default_branch) croak("More than one default clause in switch statement");
                 cur = [];
                 branch = new AST_Default({
                     start : (tmp = S.token, next(), expect(":"), tmp),
                     body  : cur
                 });
                 a.push(branch);
+                default_branch = branch;
             } else {
                 if (!cur) unexpected();
                 cur.push(statement());

lib/propmangle.js

@@ -43,7 +43,8 @@
 
 "use strict";
 
-function find_builtins(reserved) {
+var builtins = function() {
+    var names = [];
     // NaN will be included due to Number.NaN
     [
         "null",
@@ -67,19 +68,21 @@ function find_builtins(reserved) {
     ].forEach(function(ctor) {
         Object.getOwnPropertyNames(ctor).map(add);
         if (ctor.prototype) {
+            Object.getOwnPropertyNames(new ctor()).map(add);
             Object.getOwnPropertyNames(ctor.prototype).map(add);
         }
     });
+    return makePredicate(names);
 
     function add(name) {
-        push_uniq(reserved, name);
+        names.push(name);
     }
-}
+}();
 
 function reserve_quoted_keys(ast, reserved) {
     ast.walk(new TreeWalker(function(node) {
-        if (node instanceof AST_ObjectKeyVal && node.quote) {
-            add(node.key);
+        if (node instanceof AST_ObjectKeyVal) {
+            if (node.quote) add(node.key);
         } else if (node instanceof AST_Sub) {
             addStrings(node.property, add);
         }
@@ -91,17 +94,14 @@ function reserve_quoted_keys(ast, reserved) {
 }
 
 function addStrings(node, add) {
-    node.walk(new TreeWalker(function(node) {
-        if (node instanceof AST_Sequence) {
-            addStrings(node.tail_node(), 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;
-    }));
+    if (node instanceof AST_Conditional) {
+        addStrings(node.consequent, add);
+        addStrings(node.alternative, add);
+    } else if (node instanceof AST_Sequence) {
+        addStrings(node.tail_node(), add);
+    } else if (node instanceof AST_String) {
+        add(node.value);
+    }
 }
 
 function mangle_properties(ast, options) {
@@ -115,16 +115,17 @@ function mangle_properties(ast, options) {
         reserved: null,
     }, true);
 
-    var reserved = options.reserved;
-    if (!Array.isArray(reserved)) reserved = [];
-    if (!options.builtins) find_builtins(reserved);
+    var reserved = Object.create(options.builtins ? null : builtins);
+    if (Array.isArray(options.reserved)) options.reserved.forEach(function(name) {
+        reserved[name] = true;
+    });
 
     var cname = -1;
     var cache;
     if (options.cache) {
         cache = options.cache.props;
-        cache.each(function(mangled_name) {
-            push_uniq(reserved, mangled_name);
+        cache.each(function(name) {
+            reserved[name] = true;
         });
     } else {
         cache = new Dictionary();
@@ -139,62 +140,93 @@ function mangle_properties(ast, options) {
     var debug_suffix;
     if (debug) debug_suffix = options.debug === true ? "" : options.debug;
 
-    var names_to_mangle = [];
-    var unmangleable = [];
+    var names_to_mangle = Object.create(null);
+    var unmangleable = Object.create(reserved);
 
     // step 1: find candidates to mangle
     ast.walk(new TreeWalker(function(node) {
-        if (node instanceof AST_ObjectKeyVal) {
+        if (node instanceof AST_Binary) {
+            if (node.operator == "in") addStrings(node.left, add);
+        } else if (node.TYPE == "Call") {
+            var exp = node.expression;
+            if (exp instanceof AST_Dot) switch (exp.property) {
+              case "defineProperty":
+              case "getOwnPropertyDescriptor":
+                if (node.args.length < 2) break;
+                exp = exp.expression;
+                if (!(exp instanceof AST_SymbolRef)) break;
+                if (exp.name != "Object") break;
+                if (!exp.definition().undeclared) break;
+                addStrings(node.args[1], add);
+                break;
+              case "hasOwnProperty":
+                if (node.args.length < 1) break;
+                addStrings(node.args[0], add);
+                break;
+            }
+        } else if (node instanceof AST_Dot) {
+            add(node.property);
+        } else if (node instanceof AST_ObjectKeyVal) {
             add(node.key);
         } else if (node instanceof AST_ObjectProperty) {
             // setter or getter, since KeyVal is handled above
             add(node.key.name);
-        } else if (node instanceof AST_Dot) {
-            add(node.property);
         } else if (node instanceof AST_Sub) {
             addStrings(node.property, add);
-        } else if (node instanceof AST_Call
-            && node.expression.print_to_string() == "Object.defineProperty") {
-            addStrings(node.args[1], add);
         }
     }));
 
-    // step 2: transform the tree, renaming properties
-    return ast.transform(new TreeTransformer(function(node) {
-        if (node instanceof AST_ObjectKeyVal) {
+    // step 2: renaming properties
+    ast.walk(new TreeWalker(function(node) {
+        if (node instanceof AST_Binary) {
+            if (node.operator == "in") mangleStrings(node.left);
+        } else if (node.TYPE == "Call") {
+            var exp = node.expression;
+            if (exp instanceof AST_Dot) switch (exp.property) {
+              case "defineProperty":
+              case "getOwnPropertyDescriptor":
+                if (node.args.length < 2) break;
+                exp = exp.expression;
+                if (!(exp instanceof AST_SymbolRef)) break;
+                if (exp.name != "Object") break;
+                if (!exp.definition().undeclared) break;
+                mangleStrings(node.args[1]);
+                break;
+              case "hasOwnProperty":
+                if (node.args.length < 1) break;
+                mangleStrings(node.args[0]);
+                break;
+            }
+        } else if (node instanceof AST_Dot) {
+            node.property = mangle(node.property);
+        } else if (node instanceof AST_ObjectKeyVal) {
             node.key = mangle(node.key);
         } else if (node instanceof AST_ObjectProperty) {
             // setter or getter
             node.key.name = mangle(node.key.name);
-        } 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_Call
-            && node.expression.print_to_string() == "Object.defineProperty") {
-            node.args[1] = mangleStrings(node.args[1]);
+        } else if (node instanceof AST_Sub) {
+            if (!options.keep_quoted) mangleStrings(node.property);
         }
     }));
 
     // only function declarations after this line
 
     function can_mangle(name) {
-        if (unmangleable.indexOf(name) >= 0) return false;
-        if (reserved.indexOf(name) >= 0) return false;
+        if (unmangleable[name]) return false;
         if (options.only_cache) return cache.has(name);
         if (/^-?[0-9]+(\.[0-9]+)?(e[+-][0-9]+)?$/.test(name)) return false;
         return true;
     }
 
     function should_mangle(name) {
+        if (reserved[name]) return false;
         if (regex && !regex.test(name)) return false;
-        if (reserved.indexOf(name) >= 0) return false;
-        return cache.has(name) || names_to_mangle.indexOf(name) >= 0;
+        return cache.has(name) || names_to_mangle[name];
     }
 
     function add(name) {
-        if (can_mangle(name)) push_uniq(names_to_mangle, name);
-        if (!should_mangle(name)) push_uniq(unmangleable, name);
+        if (can_mangle(name)) names_to_mangle[name] = true;
+        if (!should_mangle(name)) unmangleable[name] = true;
     }
 
     function mangle(name) {
@@ -218,17 +250,13 @@ function mangle_properties(ast, options) {
     }
 
     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]);
-            } else if (node instanceof AST_String) {
-                node.value = mangle(node.value);
-            } else if (node instanceof AST_Conditional) {
-                node.consequent = mangleStrings(node.consequent);
-                node.alternative = mangleStrings(node.alternative);
-            }
-            return node;
-        }));
+        if (node instanceof AST_Sequence) {
+            mangleStrings(node.expressions.tail_node());
+        } else if (node instanceof AST_String) {
+            node.value = mangle(node.value);
+        } else if (node instanceof AST_Conditional) {
+            mangleStrings(node.consequent);
+            mangleStrings(node.alternative);
+        }
     }
 }

lib/scope.js

@@ -559,21 +559,23 @@ AST_Toplevel.DEFMETHOD("compute_char_frequency", function(options) {
     options = _default_mangler_options(options);
     base54.reset();
     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);
-                }
-            }
+        var fn = AST_Symbol.prototype.add_source_map;
+        AST_Symbol.prototype.add_source_map = function() {
+            if (!this.unmangleable(options)) base54.consider(this.name, -1);
         };
+        if (options.properties) {
+            AST_Dot.prototype.add_source_map = function() {
+                base54.consider(this.property, -1);
+            };
+            AST_Sub.prototype.add_source_map = function() {
+                skip_string(this.property);
+            };
+        }
         base54.consider(this.print_to_string(), 1);
     } finally {
-        AST_Node.prototype.print = AST_Node.prototype._print;
+        AST_Symbol.prototype.add_source_map = fn;
+        delete AST_Dot.prototype.add_source_map;
+        delete AST_Sub.prototype.add_source_map;
     }
     base54.sort();
 

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": "3.10.1",
+  "version": "3.10.2",
   "engines": {
     "node": ">=0.8.0"
   },

test/compress.js

@@ -312,9 +312,7 @@ function test_case(test) {
     if (test.mangle) {
         output.compute_char_frequency(test.mangle);
         output.mangle_names(test.mangle);
-        if (test.mangle.properties) {
-            output = U.mangle_properties(output, test.mangle.properties);
-        }
+        if (test.mangle.properties) U.mangle_properties(output, test.mangle.properties);
     }
     var output_code = make_code(output, output_options);
     if (expect != output_code) {

test/compress/collapse_vars.js

@@ -1599,7 +1599,7 @@ collapse_vars_constants: {
     }
 }
 
-collapse_vars_arguments: {
+collapse_vars_arguments_1: {
     options = {
         booleans: true,
         collapse_vars: true,
@@ -1636,6 +1636,78 @@ collapse_vars_arguments: {
     expect_stdout: true
 }
 
+collapse_vars_arguments_2: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        function log(a, b) {
+            console.log(b);
+        }
+        function f(c) {
+            var d = arguments[0];
+            c = "FAIL";
+            log(c, d);
+        }
+        f();
+        f("PASS");
+    }
+    expect: {
+        function log(a, b) {
+            console.log(b);
+        }
+        function f(c) {
+            var d = arguments[0];
+            log(c = "FAIL", d);
+        }
+        f();
+        f("PASS");
+    }
+    expect_stdout: [
+        "undefined",
+        "PASS",
+    ]
+}
+
+collapse_vars_arguments_3: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        function log(a, b) {
+            console.log(b);
+        }
+        function f(c) {
+            var args = arguments;
+            console.log(c);
+            var d = args[0];
+            c = "FAIL";
+            log(c, d);
+        }
+        f();
+        f("PASS");
+    }
+    expect: {
+        function log(a, b) {
+            console.log(b);
+        }
+        function f(c) {
+            var args = arguments;
+            console.log(c);
+            var d = args[0];
+            log(c = "FAIL", d);
+        }
+        f();
+        f("PASS");
+    }
+    expect_stdout: [
+        "undefined",
+        "undefined",
+        "PASS",
+        "PASS",
+    ]
+}
+
 collapse_vars_short_circuit: {
     options = {
         booleans: true,
@@ -8317,3 +8389,152 @@ issue_4012: {
     }
     expect_stdout: "PASS"
 }
+
+global_assign: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        this.A = "FAIL";
+        A = "PASS";
+        B = "FAIL";
+        console.log(A);
+    }
+    expect: {
+        this.A = "FAIL";
+        A = "PASS";
+        B = "FAIL";
+        console.log(A);
+    }
+    expect_stdout: "PASS"
+}
+
+global_read: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        var a = 0;
+        a = this.A;
+        A = 1;
+        a ? console.log("FAIL") : console.log("PASS");
+    }
+    expect: {
+        var a = 0;
+        a = this.A;
+        A = 1;
+        a ? console.log("FAIL") : console.log("PASS");
+    }
+    expect_stdout: "PASS"
+}
+
+issue_4038: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        var a = 0;
+        a = this;
+        a = a.A;
+        A = 1;
+        a ? console.log("FAIL") : console.log("PASS");
+    }
+    expect: {
+        var a = 0;
+        a = (a = this).A;
+        A = 1;
+        a ? console.log("FAIL") : console.log("PASS");
+    }
+    expect_stdout: "PASS"
+}
+
+issue_4040: {
+    options = {
+        collapse_vars: true,
+        toplevel: true,
+    }
+    input: {
+        var a = console.log("PASS") && a.p;
+        delete NaN;
+    }
+    expect: {
+        var a = console.log("PASS") && a.p;
+        delete NaN;
+    }
+    expect_stdout: "PASS"
+}
+
+issue_4047_1: {
+    options = {
+        collapse_vars: true,
+        evaluate: true,
+        inline: true,
+        reduce_vars: true,
+        sequences: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var b = 1;
+        console.log(+function(a) {
+            b = a;
+            (a >>= 0) && console.log("PASS");
+        }(--b + (0 !== typeof A)));
+    }
+    expect: {
+        var b = 1;
+        var a;
+        console.log((a = --b + ((a = 0) !== typeof A), +void ((a >>= 0) && console.log("PASS"))));
+    }
+    expect_stdout: [
+        "PASS",
+        "NaN",
+    ]
+}
+
+issue_4047_2: {
+    options = {
+        collapse_vars: true,
+        evaluate: true,
+        inline: true,
+        passes: 2,
+        reduce_vars: true,
+        sequences: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var b = 1;
+        console.log(+function(a) {
+            b = a;
+            (a >>= 0) && console.log("PASS");
+        }(--b + (0 !== typeof A)));
+    }
+    expect: {
+        var a;
+        console.log((a = +(0 !== typeof A), +void ((a >>= 0) && console.log("PASS"))));
+    }
+    expect_stdout: [
+        "PASS",
+        "NaN",
+    ]
+}
+
+issue_4051: {
+    options = {
+        collapse_vars: true,
+    }
+    input: {
+        try {
+            var a = (b = b.p, "FAIL"), b = b;
+        } catch (e) {}
+        console.log(a);
+    }
+    expect: {
+        try {
+            var a = (b = b.p, "FAIL"), b = b;
+        } catch (e) {}
+        console.log(a);
+    }
+    expect_stdout: "undefined"
+}

test/compress/comparisons.js

@@ -123,6 +123,29 @@ self_comparison_3: {
     ]
 }
 
+self_comparison_4: {
+    options = {
+        booleans: true,
+        comparisons: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var o = {};
+        console.log(o == o, o != o);
+        console.log(o === o, o !== o);
+    }
+    expect: {
+        console.log(!0, !1);
+        console.log(!0, !1);
+    }
+    expect_stdout: [
+        "true false",
+        "true false",
+    ]
+}
+
 issue_2857_1: {
     options = {
         comparisons: true,

test/compress/dead-code.js

@@ -1341,3 +1341,24 @@ issue_3967: {
     }
     expect_stdout: "PASS"
 }
+
+issue_4051: {
+    options = {
+        dead_code: true,
+    }
+    input: {
+        try {
+            delete (A = A);
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect: {
+        try {
+            delete (A = A);
+        } catch (e) {
+            console.log("PASS");
+        }
+    }
+    expect_stdout: "PASS"
+}

test/compress/evaluate.js

@@ -2833,3 +2833,39 @@ issue_3997: {
     }
     expect_stdout: "string"
 }
+
+issue_4035: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+    }
+    input: {
+        var a = 0;
+        (function() {
+            var b = --a;
+            console.log(delete (0 + b));
+            console.log(delete (1 * b));
+            console.log(delete (b + 0));
+            console.log(delete (b - 0));
+            console.log(delete (b / 1));
+        })();
+    }
+    expect: {
+        var a = 0;
+        (function() {
+            var b = --a;
+            console.log((0 + b, true));
+            console.log((1 * b, true));
+            console.log((0 + b, true));
+            console.log((b - 0, true));
+            console.log((b / 1, true));
+        })();
+    }
+    expect_stdout: [
+        "true",
+        "true",
+        "true",
+        "true",
+        "true",
+    ]
+}

test/compress/properties.js

@@ -130,7 +130,7 @@ evaluate_string_length: {
     }
 }
 
-mangle_properties: {
+mangle_properties_1: {
     mangle = {
         properties: {
             keep_quoted: false,
@@ -152,6 +152,53 @@ mangle_properties: {
     }
 }
 
+mangle_properties_2: {
+    mangle = {
+        properties: {
+            reserved: [
+                "value",
+            ]
+        },
+    }
+    input: {
+        var o = {
+            prop1: 1,
+        };
+        Object.defineProperty(o, "prop2", {
+            value: 2,
+        });
+        Object.defineProperties(o, {
+            prop3: {
+                value: 3,
+            },
+        });
+        console.log("prop1", o.prop1, "prop1" in o);
+        console.log("prop2", o.prop2, o.hasOwnProperty("prop2"));
+        console.log("prop3", o.prop3, Object.getOwnPropertyDescriptor(o, "prop3").value);
+    }
+    expect: {
+        var o = {
+            o: 1,
+        };
+        Object.defineProperty(o, "p", {
+            value: 2,
+        });
+        Object.defineProperties(o, {
+            r: {
+                value: 3,
+            },
+        });
+        console.log("prop1", o.o, "o" in o);
+        console.log("prop2", o.p, o.hasOwnProperty("p"));
+        console.log("prop3", o.r, Object.getOwnPropertyDescriptor(o, "r").value);
+    }
+    expect_stdout: [
+        "prop1 1 true",
+        "prop2 2 true",
+        "prop3 3 3",
+    ]
+}
+
 mangle_unquoted_properties: {
     options = {
         evaluate: true,

test/compress/reduce_vars.js

@@ -2031,6 +2031,7 @@ issue_1670_4: {
 
 issue_1670_5: {
     options = {
+        conditionals: true,
         dead_code: true,
         evaluate: true,
         keep_fargs: false,
@@ -2062,6 +2063,7 @@ issue_1670_5: {
 
 issue_1670_6: {
     options = {
+        conditionals: true,
         dead_code: true,
         evaluate: true,
         keep_fargs: false,
@@ -7402,7 +7404,27 @@ issue_4030: {
     }
     expect: {
         A = "PASS";
-        console.log("PASS");
+        console.log(A);
+    }
+    expect_stdout: "PASS"
+}
+
+global_assign: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        A = "FAIL";
+        this.A = "PASS";
+        console.log(A);
+    }
+    expect: {
+        A = "FAIL";
+        this.A = "PASS";
+        console.log(A);
     }
     expect_stdout: "PASS"
 }

test/compress/sandbox.js

@@ -80,3 +80,21 @@ log_global: {
     }
     expect_stdout: "[object global]"
 }
+
+issue_4054: {
+    input: {
+        console.log({
+            set p(v) {
+                throw "FAIL";
+            },
+        });
+    }
+    expect: {
+        console.log({
+            set p(v) {
+                throw "FAIL";
+            },
+        });
+    }
+    expect_stdout: "{ p: [Setter] }"
+}

test/compress/switch.js

@@ -1,5 +1,6 @@
 constant_switch_1: {
     options = {
+        conditionals: true,
         dead_code: true,
         evaluate: true,
         side_effects: true,
@@ -19,6 +20,7 @@ constant_switch_1: {
 
 constant_switch_2: {
     options = {
+        conditionals: true,
         dead_code: true,
         evaluate: true,
         side_effects: true,
@@ -39,6 +41,7 @@ constant_switch_2: {
 
 constant_switch_3: {
     options = {
+        conditionals: true,
         dead_code: true,
         evaluate: true,
         side_effects: true,
@@ -60,6 +63,7 @@ constant_switch_3: {
 
 constant_switch_4: {
     options = {
+        conditionals: true,
         dead_code: true,
         evaluate: true,
         side_effects: true,
@@ -86,6 +90,7 @@ constant_switch_4: {
 
 constant_switch_5: {
     options = {
+        conditionals: true,
         dead_code: true,
         evaluate: true,
         side_effects: true,
@@ -120,6 +125,7 @@ constant_switch_5: {
 
 constant_switch_6: {
     options = {
+        conditionals: true,
         dead_code: true,
         evaluate: true,
         side_effects: true,
@@ -154,6 +160,7 @@ constant_switch_6: {
 
 constant_switch_7: {
     options = {
+        conditionals: true,
         dead_code: true,
         evaluate: true,
         side_effects: true,
@@ -197,6 +204,7 @@ constant_switch_7: {
 
 constant_switch_8: {
     options = {
+        conditionals: true,
         dead_code: true,
         evaluate: true,
         side_effects: true,
@@ -226,6 +234,7 @@ constant_switch_8: {
 
 constant_switch_9: {
     options = {
+        conditionals: true,
         dead_code: true,
         evaluate: true,
         side_effects: true,
@@ -315,6 +324,7 @@ keep_default: {
 
 issue_1663: {
     options = {
+        conditionals: true,
         dead_code: true,
         evaluate: true,
         side_effects: true,
@@ -551,6 +561,7 @@ issue_441_2: {
 
 issue_1674: {
     options = {
+        conditionals: true,
         dead_code: true,
         evaluate: true,
         side_effects: true,
@@ -876,6 +887,7 @@ beautify: {
 
 issue_1758: {
     options = {
+        conditionals: true,
         dead_code: true,
         switches: true,
     }
@@ -898,15 +910,16 @@ issue_1758: {
 
 issue_2535: {
     options = {
+        conditionals: true,
         dead_code: true,
         evaluate: true,
         switches: true,
     }
     input: {
         switch(w(), 42) {
-            case 13: x();
-            case 42: y();
-            default: z();
+          case 13: x();
+          case 42: y();
+          default: z();
         }
     }
     expect: {
@@ -919,6 +932,7 @@ issue_2535: {
 
 issue_1750: {
     options = {
+        conditionals: true,
         dead_code: true,
         evaluate: true,
         switches: true,
@@ -963,6 +977,7 @@ drop_switch_1: {
 
 drop_switch_2: {
     options = {
+        conditionals: true,
         dead_code: true,
         switches: true,
     }
@@ -1007,6 +1022,7 @@ drop_switch_3: {
 
 drop_switch_4: {
     options = {
+        conditionals: true,
         dead_code: true,
         switches: true,
     }
@@ -1028,3 +1044,140 @@ drop_switch_4: {
     }
     expect_stdout: "PASS"
 }
+
+drop_switch_5: {
+    options = {
+        conditionals: true,
+        dead_code: true,
+        switches: true,
+    }
+    input: {
+        switch (A) {
+          case B:
+            x();
+          default:
+        }
+        switch (C) {
+          default:
+            y();
+          case D:
+        }
+    }
+    expect: {
+        A === B && x();
+        C !== D && y();
+    }
+}
+
+drop_switch_6: {
+    options = {
+        conditionals: true,
+        dead_code: true,
+        switches: true,
+    }
+    input: {
+        switch (A) {
+          case B:
+          default:
+            x();
+        }
+        switch (C) {
+          default:
+          case D:
+            y();
+        }
+    }
+    expect: {
+        A === B;
+        x();
+        C !== D;
+        y();
+    }
+}
+
+drop_switch_7: {
+    options = {
+        conditionals: true,
+        dead_code: true,
+        switches: true,
+    }
+    input: {
+        switch (A) {
+          case B:
+            w();
+          default:
+            x();
+        }
+        switch (C) {
+          default:
+            y();
+          case D:
+            z();
+        }
+    }
+    expect: {
+        A === B && w();
+        x();
+        C !== D && y();
+        z();
+    }
+}
+
+drop_switch_8: {
+    options = {
+        conditionals: true,
+        dead_code: true,
+        switches: true,
+    }
+    input: {
+        switch (A) {
+          case B:
+            w();
+            break;
+          default:
+            x();
+        }
+        switch (C) {
+          default:
+            y();
+            break;
+          case D:
+            z();
+        }
+    }
+    expect: {
+        (A === B ? w : x)();
+        (C !== D ? y : z)();
+    }
+}
+
+issue_4059: {
+    options = {
+        conditionals: true,
+        dead_code: true,
+        evaluate: true,
+        switches: true,
+    }
+    input: {
+        switch (0) {
+          default:
+          case 1:
+            break;
+          case a:
+            break;
+            var a;
+        }
+        console.log("PASS");
+    }
+    expect: {
+        switch (0) {
+          default:
+            break;
+          case a:
+            break;
+            var a;
+        }
+        console.log("PASS");
+    }
+    expect_stdout: "PASS"
+}

test/input/invalid/switch.js

@@ -0,0 +1,4 @@
+switch (0) {
+  default:
+  default:
+}

test/mocha/cli.js

@@ -330,7 +330,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should fail with invalid syntax", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/simple.js';
+        var command = uglifyjscmd + " test/input/invalid/simple.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             var lines = stderr.split(/\n/);
@@ -342,7 +342,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should fail with correct marking of tabs", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/tab.js';
+        var command = uglifyjscmd + " test/input/invalid/tab.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             var lines = stderr.split(/\n/);
@@ -354,7 +354,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should fail with correct marking at start of line", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/eof.js';
+        var command = uglifyjscmd + " test/input/invalid/eof.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             var lines = stderr.split(/\n/);
@@ -366,7 +366,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should fail with a missing loop body", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/loop-no-body.js';
+        var command = uglifyjscmd + " test/input/invalid/loop-no-body.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             var lines = stderr.split(/\n/);
@@ -378,7 +378,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should throw syntax error (5--)", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/assign_1.js';
+        var command = uglifyjscmd + " test/input/invalid/assign_1.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.strictEqual(stdout, "");
@@ -392,7 +392,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should throw syntax error (Math.random() /= 2)", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/assign_2.js';
+        var command = uglifyjscmd + " test/input/invalid/assign_2.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.strictEqual(stdout, "");
@@ -406,7 +406,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should throw syntax error (++this)", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/assign_3.js';
+        var command = uglifyjscmd + " test/input/invalid/assign_3.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.strictEqual(stdout, "");
@@ -420,7 +420,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should throw syntax error (++null)", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/assign_4.js';
+        var command = uglifyjscmd + " test/input/invalid/assign_4.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.strictEqual(stdout, "");
@@ -434,7 +434,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should throw syntax error (a.=)", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/dot_1.js';
+        var command = uglifyjscmd + " test/input/invalid/dot_1.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.strictEqual(stdout, "");
@@ -448,7 +448,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should throw syntax error (%.a)", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/dot_2.js';
+        var command = uglifyjscmd + " test/input/invalid/dot_2.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.strictEqual(stdout, "");
@@ -462,7 +462,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should throw syntax error (a./();)", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/dot_3.js';
+        var command = uglifyjscmd + " test/input/invalid/dot_3.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.strictEqual(stdout, "");
@@ -476,7 +476,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should throw syntax error ({%: 1})", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/object.js';
+        var command = uglifyjscmd + " test/input/invalid/object.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.strictEqual(stdout, "");
@@ -490,7 +490,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should throw syntax error (delete x)", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/delete.js';
+        var command = uglifyjscmd + " test/input/invalid/delete.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.strictEqual(stdout, "");
@@ -504,7 +504,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should throw syntax error (function g(arguments))", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/function_1.js';
+        var command = uglifyjscmd + " test/input/invalid/function_1.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.strictEqual(stdout, "");
@@ -518,7 +518,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should throw syntax error (function eval())", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/function_2.js';
+        var command = uglifyjscmd + " test/input/invalid/function_2.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.strictEqual(stdout, "");
@@ -532,7 +532,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should throw syntax error (iife arguments())", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/function_3.js';
+        var command = uglifyjscmd + " test/input/invalid/function_3.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.strictEqual(stdout, "");
@@ -546,7 +546,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should throw syntax error (catch (eval))", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/try.js';
+        var command = uglifyjscmd + " test/input/invalid/try.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.strictEqual(stdout, "");
@@ -560,7 +560,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should throw syntax error (var eval)", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/var.js';
+        var command = uglifyjscmd + " test/input/invalid/var.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.strictEqual(stdout, "");
@@ -574,7 +574,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should throw syntax error (else)", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/else.js';
+        var command = uglifyjscmd + " test/input/invalid/else.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.strictEqual(stdout, "");
@@ -588,7 +588,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should throw syntax error (return)", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/return.js';
+        var command = uglifyjscmd + " test/input/invalid/return.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.strictEqual(stdout, "");
@@ -602,7 +602,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should throw syntax error (for-in init)", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/for-in_1.js';
+        var command = uglifyjscmd + " test/input/invalid/for-in_1.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.strictEqual(stdout, "");
@@ -616,7 +616,7 @@ describe("bin/uglifyjs", function() {
         });
     });
     it("Should throw syntax error (for-in var)", function(done) {
-        var command = uglifyjscmd + ' test/input/invalid/for-in_2.js';
+        var command = uglifyjscmd + " test/input/invalid/for-in_2.js";
         exec(command, function(err, stdout, stderr) {
             assert.ok(err);
             assert.strictEqual(stdout, "");
@@ -629,6 +629,18 @@ describe("bin/uglifyjs", function() {
             done();
         });
     });
+    it("Should throw syntax error (switch defaults)", function(done) {
+        var command = uglifyjscmd + " test/input/invalid/switch.js";
+        exec(command, function(err, stdout, stderr) {
+            assert.ok(err);
+            var lines = stderr.split(/\n/);
+            assert.strictEqual(lines[0], "Parse error at test/input/invalid/switch.js:3,2");
+            assert.strictEqual(lines[1], "  default:");
+            assert.strictEqual(lines[2], "  ^");
+            assert.strictEqual(lines[3], "ERROR: More than one default clause in switch statement");
+            done();
+        });
+    });
     it("Should handle literal string as source map input", function(done) {
         var command = [
             uglifyjscmd,

test/sandbox.js

@@ -40,7 +40,7 @@ function createContext() {
             arg.constructor.toString();
             if (level--) for (var key in arg) {
                 var desc = Object.getOwnPropertyDescriptor(arg, key);
-                if (!desc || !desc.get) arg[key] = safe_log(arg[key], level);
+                if (!desc || !desc.get && !desc.set) arg[key] = safe_log(arg[key], level);
             }
         }
         return arg;

test/ufuzz/actions.js

@@ -0,0 +1,49 @@
+require("../../tools/exit");
+
+var get = require("https").get;
+var parse = require("url").parse;
+var base = process.argv[2];
+var token = process.argv[3];
+
+function read(url, callback) {
+    var options = parse(url);
+    options.headers = {
+        "Authorization": "Token " + token,
+        "User-Agent": "UglifyJS",
+    };
+    get(options, function(response) {
+        var chunks = [];
+        response.setEncoding("utf8");
+        response.on("data", function(chunk) {
+            chunks.push(chunk);
+        }).on("end", function() {
+            callback(JSON.parse(chunks.join("")));
+        });
+    });
+}
+
+var queued = 0, total = 0, earliest, now = Date.now();
+process.on("beforeExit", function() {
+    if (queued > 3) {
+        process.stdout.write("0");
+    } else if (now - earliest > 0 && total > 1) {
+        process.stdout.write(Math.min(20 * (now - earliest) / (total - 1), 6300000).toFixed(0));
+    } else {
+        process.stdout.write("3600000");
+    }
+});
+read(base + "/actions/workflows/ufuzz.yml/runs?event=schedule", function(reply) {
+    reply.workflow_runs.filter(function(workflow) {
+        return /^(in_progress|queued|)$/.test(workflow.status);
+    }).forEach(function(workflow) {
+        read(workflow.jobs_url, function(reply) {
+            reply.jobs.forEach(function(job) {
+                if (job.status == "queued") queued++;
+                total++;
+                if (!job.started_at) return;
+                var start = new Date(job.started_at);
+                if (!(earliest < start)) earliest = start;
+            });
+        });
+    });
+});

test/ufuzz/index.js

@@ -1175,7 +1175,8 @@ function log(options) {
 }
 
 function sort_globals(code) {
-    return "var " + sandbox.run_code("throw Object.keys(this).sort();" + code).join(",") + ";" + code;
+    var globals = sandbox.run_code("throw Object.keys(this).sort();" + code);
+    return globals.length ? "var " + globals.join(",") + ";" + code : code;
 }
 
 function fuzzy_match(original, uglified) {

tools/domprops.html

@@ -0,0 +1,456 @@
+<!doctype html>
+<html>
+<body>
+    <script>
+        !function(G) {
+            var domprops = [];
+            var objs = [ G ];
+            var tagNames = [
+                "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",
+                "nextid",
+                "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",
+                "slot",
+                "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",
+            ];
+            for (var n = 0; n < tagNames.length; n++) {
+                add(document.createElement(tagNames[n]));
+            }
+            var nsNames = {
+                "http://www.w3.org/1998/Math/MathML": [
+                    "annotation",
+                    "annotation-xml",
+                    "maction",
+                    "maligngroup",
+                    "malignmark",
+                    "math",
+                    "menclose",
+                    "merror",
+                    "mfenced",
+                    "mfrac",
+                    "mglyph",
+                    "mi",
+                    "mlabeledtr",
+                    "mlongdiv",
+                    "mmultiscripts",
+                    "mn",
+                    "mo",
+                    "mover",
+                    "mpadded",
+                    "mphantom",
+                    "mprescripts",
+                    "mroot",
+                    "mrow",
+                    "ms",
+                    "mscarries",
+                    "mscarry",
+                    "msgroup",
+                    "msline",
+                    "mspace",
+                    "msqrt",
+                    "msrow",
+                    "mstack",
+                    "mstyle",
+                    "msub",
+                    "msubsup",
+                    "msup",
+                    "mtable",
+                    "mtd",
+                    "mtext",
+                    "mtr",
+                    "munder",
+                    "munderover",
+                    "none",
+                    "semantics",
+                ],
+                "http://www.w3.org/2000/svg": [
+                    "a",
+                    "altGlyph",
+                    "altGlyphDef",
+                    "altGlyphItem",
+                    "animate",
+                    "animateColor",
+                    "animateMotion",
+                    "animateTransform",
+                    "circle",
+                    "clipPath",
+                    "color-profile",
+                    "cursor",
+                    "defs",
+                    "desc",
+                    "discard",
+                    "ellipse",
+                    "feBlend",
+                    "feColorMatrix",
+                    "feComponentTransfer",
+                    "feComposite",
+                    "feConvolveMatrix",
+                    "feDiffuseLighting",
+                    "feDisplacementMap",
+                    "feDistantLight",
+                    "feDropShadow",
+                    "feFlood",
+                    "feFuncA",
+                    "feFuncB",
+                    "feFuncG",
+                    "feFuncR",
+                    "feGaussianBlur",
+                    "feImage",
+                    "feMerge",
+                    "feMergeNode",
+                    "feMorphology",
+                    "feOffset",
+                    "fePointLight",
+                    "feSpecularLighting",
+                    "feSpotLight",
+                    "feTile",
+                    "feTurbulence",
+                    "filter",
+                    "font",
+                    "font-face",
+                    "font-face-format",
+                    "font-face-name",
+                    "font-face-src",
+                    "font-face-uri",
+                    "foreignObject",
+                    "g",
+                    "glyph",
+                    "glyphRef",
+                    "hatch",
+                    "hatchpath",
+                    "hkern",
+                    "image",
+                    "line",
+                    "linearGradient",
+                    "marker",
+                    "mask",
+                    "mesh",
+                    "meshgradient",
+                    "meshpatch",
+                    "meshrow",
+                    "metadata",
+                    "missing-glyph",
+                    "mpath",
+                    "path",
+                    "pattern",
+                    "polygon",
+                    "polyline",
+                    "radialGradient",
+                    "rect",
+                    "script",
+                    "set",
+                    "solidcolor",
+                    "stop",
+                    "style",
+                    "svg",
+                    "switch",
+                    "symbol",
+                    "text",
+                    "textPath",
+                    "title",
+                    "tref",
+                    "tspan",
+                    "unknown",
+                    "use",
+                    "view",
+                    "vkern",
+                ],
+            };
+            if (document.createElementNS) for (var ns in nsNames) {
+                for (var n = 0; n < nsNames[ns].length; n++) {
+                    add(document.createElementNS(ns, nsNames[ns][n]));
+                }
+            }
+            var skips = [
+                G.alert,
+                G.back,
+                G.blur,
+                G.captureEvents,
+                G.clearImmediate,
+                G.clearInterval,
+                G.clearTimeout,
+                G.close,
+                G.confirm,
+                G.console,
+                G.dump,
+                G.fetch,
+                G.find,
+                G.focus,
+                G.forward,
+                G.getAttention,
+                G.history,
+                G.home,
+                G.location,
+                G.moveBy,
+                G.moveTo,
+                G.navigator,
+                G.open,
+                G.openDialog,
+                G.print,
+                G.process,
+                G.prompt,
+                G.resizeBy,
+                G.resizeTo,
+                G.setImmediate,
+                G.setInterval,
+                G.setTimeout,
+                G.showModalDialog,
+                G.sizeToContent,
+                G.stop,
+            ];
+            var types = [];
+            var interfaces = [
+                "beforeunloadevent",
+                "compositionevent",
+                "customevent",
+                "devicemotionevent",
+                "deviceorientationevent",
+                "dragevent",
+                "event",
+                "events",
+                "focusevent",
+                "hashchangeevent",
+                "htmlevents",
+                "keyboardevent",
+                "messageevent",
+                "mouseevent",
+                "mouseevents",
+                "storageevent",
+                "svgevents",
+                "textevent",
+                "touchevent",
+                "uievent",
+                "uievents",
+            ];
+            var i = 0, full = false;
+            var addEvent = document.createEvent ? function(type) {
+                if (~indexOf(types, type)) return;
+                types.push(type);
+                for (var j = 0; j < interfaces.length; j++) try {
+                    var event = document.createEvent(interfaces[j]);
+                    event.initEvent(type, true, true);
+                    add(event);
+                } catch (e) {}
+            } : function() {};
+            var scanProperties = Object.getOwnPropertyNames ? function(o, fn) {
+                var names = Object.getOwnPropertyNames(o);
+                names.forEach(fn);
+                for (var k in o) if (!~indexOf(names, k)) fn(k);
+            } : function(o, fn) {
+                for (var k in o) fn(k);
+            };
+            setTimeout(function next() {
+                for (var j = 10; --j >= 0 && i < objs.length; i++) {
+                    var o = objs[i];
+                    var skip = ~indexOf(skips, o);
+                    try {
+                        scanProperties(o, function(k) {
+                            if (!~indexOf(domprops, k)) domprops.push(k);
+                            if (/^on/.test(k)) addEvent(k.slice(2));
+                            if (!full) try {
+                                add(o[k]);
+                            } catch (e) {}
+                        });
+                    } catch (e) {}
+                    if (skip || full) continue;
+                    try {
+                        add(o.__proto__);
+                    } catch (e) {}
+                    try {
+                        add(o.prototype);
+                    } catch (e) {}
+                    try {
+                        add(new o());
+                    } catch (e) {}
+                    try {
+                        add(o());
+                    } catch (e) {}
+                }
+                if (!full && objs.length > 20000) {
+                    alert(objs.length);
+                    full = true;
+                }
+                if (i < objs.length) {
+                    setTimeout(next, 0);
+                } else {
+                    document.write('<pre>[\n    "' + domprops.sort().join('",\n    "').replace(/&/g, "&amp;").replace(/</g, "&lt;") + '"\n]</pre>');
+                }
+            }, 0);
+
+            function add(o) {
+                if (o) switch (typeof o) {
+                case "function":
+                case "object":
+                    if (!~indexOf(objs, o)) objs.push(o);
+                }
+            }
+
+            function indexOf(list, value) {
+                var j = list.length;
+                while (--j >= 0) {
+                    if (list[j] === value) break;
+                }
+                return j;
+            }
+        }(function() {
+            return this;
+        }());
+    </script>
+</body>
+</html>

tools/props.html

@@ -1,540 +0,0 @@
-<!doctype html>
-<html>
-<body>
-    <script>
-        !function() {
-            var names = [];
-            var scanned = [];
-            var to_scan = [];
-
-            function scan(obj) {
-                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 {
-                        var event = document.createEvent(interface);
-                        event.initEvent(type, true, true);
-                        scan(event);
-                    } catch (e) {}
-                });
-            });
-
-            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 {
-                            scan(obj[name]);
-                            if (visited) return;
-                            if (/^create/.test(name)) {
-                                scan(obj[name]());
-                            }
-                            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>