v3.15.4

fixes #5411

lib/ast.js

@@ -851,6 +851,9 @@ var AST_DefClass = DEFNODE("DefClass", null, {
     $propdoc: {
         name: "[AST_SymbolDefClass] the name of this class",
     },
+    resolve: function(def_class) {
+        return def_class ? this : this.parent_scope.resolve();
+    },
     _validate: function() {
         if (!(this.name instanceof AST_SymbolDefClass)) throw new Error("name must be AST_SymbolDefClass");
     },

lib/compress.js

@@ -751,6 +751,34 @@ Compressor.prototype.compress = function(node) {
             });
         }
 
+        function make_fixed(save, fn) {
+            var prev_save, prev_value;
+            return function() {
+                var current = save();
+                if (prev_save !== current) {
+                    prev_save = current;
+                    prev_value = fn(current);
+                }
+                return prev_value;
+            };
+        }
+
+        function make_fixed_default(compressor, node, save) {
+            var prev_save, prev_seq;
+            return function() {
+                var current = save();
+                var ev;
+                if (!is_undefined(current, compressor) && (ev = fuzzy_eval(compressor, current, true)) !== undefined) {
+                    return ev instanceof AST_Node ? node : current;
+                }
+                if (prev_save !== current) {
+                    prev_save = current;
+                    prev_seq = make_sequence(node, [ current, node.value ]);
+                }
+                return prev_seq;
+            };
+        }
+
         function scan_declaration(tw, compressor, lhs, fixed, visit) {
             var scanner = new TreeWalker(function(node) {
                 if (node instanceof AST_DefaultValue) {
@@ -759,15 +787,7 @@ Compressor.prototype.compress = function(node) {
                     node.value.walk(tw);
                     pop(tw);
                     var save = fixed;
-                    if (save) fixed = function() {
+                    if (save) fixed = make_fixed_default(compressor, node, save);
-                        var value = save();
-                        var ev;
-                        if (is_undefined(value, compressor)
-                            || (ev = fuzzy_eval(compressor, value, true)) === undefined) {
-                            return make_sequence(node, [ value, node.value ]);
-                        }
-                        return ev instanceof AST_Node ? node : value;
-                    };
                     node.name.walk(scanner);
                     fixed = save;
                     return true;
@@ -777,18 +797,17 @@ Compressor.prototype.compress = function(node) {
                     var save = fixed;
                     node.elements.forEach(function(node, index) {
                         if (node instanceof AST_Hole) return reset_flags(node);
-                        if (save) fixed = function() {
+                        if (save) fixed = make_fixed(save, function(value) {
                             return make_node(AST_Sub, node, {
-                                expression: save(),
+                                expression: value,
                                 property: make_node(AST_Number, node, { value: index }),
                             });
-                        };
+                        });
                         node.walk(scanner);
                     });
                     if (node.rest) {
                         var fixed_node;
-                        if (save) fixed = compressor.option("rests") && function() {
+                        if (save) fixed = compressor.option("rests") && make_fixed(save, function(value) {
-                            var value = save();
                             if (!(value instanceof AST_Array)) return node;
                             for (var i = 0, len = node.elements.length; i < len; i++) {
                                 if (value.elements[i] instanceof AST_Spread) return node;
@@ -796,7 +815,7 @@ Compressor.prototype.compress = function(node) {
                             if (!fixed_node) fixed_node = make_node(AST_Array, node);
                             fixed_node.elements = value.elements.slice(len);
                             return fixed_node;
-                        };
+                        });
                         node.rest.walk(scanner);
                     }
                     fixed = save;
@@ -812,7 +831,7 @@ Compressor.prototype.compress = function(node) {
                             node.key.walk(tw);
                             pop(tw);
                         }
-                        if (save) fixed = function() {
+                        if (save) fixed = make_fixed(save, function(value) {
                             var key = node.key;
                             var type = AST_Sub;
                             if (typeof key == "string") {
@@ -823,10 +842,10 @@ Compressor.prototype.compress = function(node) {
                                 }
                             }
                             return make_node(type, node, {
-                                expression: save(),
+                                expression: value,
-                                property: key
+                                property: key,
                             });
-                        };
+                        });
                         node.value.walk(scanner);
                     });
                     if (node.rest) {
@@ -2040,13 +2059,17 @@ Compressor.prototype.compress = function(node) {
                     if (is_lhs(node, parent)) {
                         if (value_def && !hit_rhs) assign_used = true;
                         return node;
-                    } else if (value_def) {
+                    }
+                    if (!hit_rhs && verify_ref && node.fixed !== lhs.fixed) {
+                        abort = true;
+                        return node;
+                    }
+                    if (value_def) {
                         if (stop_if_hit && assign_pos == 0) assign_pos = remaining - replaced;
                         if (!hit_rhs) replaced++;
                         return node;
-                    } else {
-                        replaced++;
                     }
+                    replaced++;
                     changed = abort = true;
                     AST_Node.info("Collapsing {node} [{file}:{line},{col}]", {
                         node: node,
@@ -2221,6 +2244,7 @@ Compressor.prototype.compress = function(node) {
                     var candidate = hit_stack[hit_stack.length - 1];
                     var assign_pos = -1;
                     var assign_used = false;
+                    var verify_ref = false;
                     var remaining;
                     var value_def = null;
                     var stop_after = null;
@@ -2248,8 +2272,11 @@ Compressor.prototype.compress = function(node) {
                     var lvalues = get_lvalues(candidate);
                     var lhs_local = is_lhs_local(lhs);
                     var rhs_value = get_rvalue(candidate);
-                    var rvalue = !compound && rhs_value instanceof AST_Sequence ? rhs_value.tail_node() : rhs_value;
+                    var rvalue = rhs_value;
-                    if (!side_effects) side_effects = value_has_side_effects();
+                    if (!side_effects) {
+                        if (!compound && rvalue instanceof AST_Sequence) rvalue = rvalue.tail_node();
+                        side_effects = value_has_side_effects();
+                    }
                     var check_destructured = in_try || !lhs_local ? function(node) {
                         return node instanceof AST_Destructured;
                     } : return_false;
@@ -2936,6 +2963,7 @@ Compressor.prototype.compress = function(node) {
                         if (matches < remaining) {
                             remaining = matches;
                             assign_pos = 0;
+                            verify_ref = true;
                         }
                     }
                     if (expr.operator == "=") mangleable_var(expr.right);
@@ -3163,47 +3191,42 @@ Compressor.prototype.compress = function(node) {
                     return;
                 }
                 var end = hit_stack.length - 1;
-                if (hit_stack[end - 1].body === hit_stack[end]) end--;
+                var last = hit_stack[end];
+                if (last instanceof AST_VarDef || hit_stack[end - 1].body === last) end--;
                 var tt = new TreeTransformer(function(node, descend, in_list) {
                     if (hit) return node;
                     if (node !== hit_stack[hit_index]) return node;
                     hit_index++;
                     if (hit_index <= end) return handle_custom_scan_order(node, tt);
                     hit = true;
-                    if (node instanceof AST_VarDef) {
+                    if (node instanceof AST_Definitions) {
-                        declare_only.set(node.name.name, (declare_only.get(node.name.name) || 0) + 1);
+                        declare_only.set(last.name.name, (declare_only.get(last.name.name) || 0) + 1);
                         if (value_def) value_def.replaced++;
-                        node = node.clone();
+                        var defns = node.definitions;
-                        node.value = null;
+                        var index = defns.indexOf(last);
-                        return value ? List.splice([ value, node ]) : node;
+                        var defn = last.clone();
+                        defn.value = null;
+                        if (!value) {
+                            node.definitions[index] = defn;
+                            return node;
+                        }
+                        var body = [ make_node(AST_SimpleStatement, value, { body: value }) ];
+                        if (index > 0) {
+                            var head = node.clone();
+                            head.definitions = defns.slice(0, index);
+                            body.unshift(head);
+                            node = node.clone();
+                            node.definitions = defns.slice(index);
+                        }
+                        body.push(node);
+                        node.definitions[0] = defn;
+                        return in_list ? List.splice(body) : make_node(AST_BlockStatement, node, { body: body });
                     }
                     if (!value) return in_list ? List.skip : null;
                     return is_statement(node) ? make_node(AST_SimpleStatement, value, { body: value }) : value;
                 }, function(node, in_list) {
-                    if (node instanceof AST_Definitions) {
-                        var body = [], defns = node.definitions;
-                        for (var index = 0, pos = 0; index < defns.length; index++) {
-                            var defn = defns[index];
-                            if (defn instanceof AST_VarDef) continue;
-                            flush();
-                            pos = index + 1;
-                            body.push(make_node(AST_SimpleStatement, defn, { body: defn }));
-                        }
-                        if (pos == 0) return;
-                        flush();
-                        if (body.length == 1) return body[0];
-                        return in_list ? List.splice(body) : make_node(AST_BlockStatement, node, { body: body });
-                    }
                     if (node instanceof AST_For) return patch_for_init(node, in_list);
-                    return patch_sequence(node, this);
+                    return patch_sequence(node, tt);
-
-                    function flush() {
-                        if (pos < index) {
-                            var cropped = node.clone();
-                            cropped.definitions = defns.slice(pos, index);
-                            body.push(cropped);
-                        }
-                    }
                 });
                 abort = false;
                 hit = false;
@@ -3249,9 +3272,13 @@ Compressor.prototype.compress = function(node) {
                 }
                 var def = lhs.definition();
                 if (def.references.length - def.replaced == referenced) return true;
-                return def.fixed && lhs.fixed && def.references.filter(function(ref) {
+                if (!def.fixed) return false;
+                if (!lhs.fixed) return false;
+                if (def.references.filter(function(ref) {
                     return ref.fixed === lhs.fixed;
-                }).length == referenced;
+                }).length != referenced) return false;
+                verify_ref = true;
+                return true;
             }
 
             function symbol_in_lvalues(sym, parent) {
@@ -3269,7 +3296,7 @@ Compressor.prototype.compress = function(node) {
                 if (def.scope.resolve() !== scope) return true;
                 if (modify_toplevel && compressor.exposed(def)) return true;
                 return !all(def.references, function(ref) {
-                    return ref.scope.resolve() === scope;
+                    return ref.scope.resolve(true) === scope;
                 });
             }
 
@@ -4767,6 +4794,7 @@ Compressor.prototype.compress = function(node) {
         });
         var scan_modified = new TreeWalker(function(node) {
             if (node instanceof AST_Assign) modified(node.left);
+            if (node instanceof AST_ForEnumeration) modified(node.init);
             if (node instanceof AST_Unary && UNARY_POSTFIX[node.operator]) modified(node.expression);
         });
         function modified(node) {
@@ -5425,7 +5453,6 @@ Compressor.prototype.compress = function(node) {
                 return !(prop instanceof AST_ObjectGetter || prop instanceof AST_Spread);
             });
         });
-        def(AST_ObjectIdentity, return_true);
         def(AST_Sequence, function() {
             return this.tail_node().safe_to_spread();
         });
@@ -6847,7 +6874,14 @@ Compressor.prototype.compress = function(node) {
                     });
                 }
             }
-            if (node instanceof AST_Call) calls_to_drop_args.push(node);
+            if (node instanceof AST_Call) {
+                calls_to_drop_args.push(node);
+                node.args = node.args.map(function(arg) {
+                    return arg.transform(tt);
+                });
+                node.expression = node.expression.transform(tt);
+                return node;
+            }
             if (scope !== self) return;
             if (drop_funcs && node !== self && node instanceof AST_DefClass) {
                 var def = node.name.definition();
@@ -7114,6 +7148,7 @@ Compressor.prototype.compress = function(node) {
                         if (def.orig.length > 1) return null;
                         if (def.assignments > 0) return false;
                         if (def.name == name) return def;
+                        if (compressor.option("keep_fnames")) return false;
                         var forbidden;
                         switch (name) {
                           case "await":
@@ -7818,7 +7853,7 @@ Compressor.prototype.compress = function(node) {
         var consts = new Dictionary();
         var dirs = [];
         var hoisted = [];
-        var vars = new Dictionary(), vars_found = 0;
+        var vars = new Dictionary();
         var tt = new TreeTransformer(function(node, descend, in_list) {
             if (node === self) return;
             if (node instanceof AST_Directive) {
@@ -7846,7 +7881,6 @@ Compressor.prototype.compress = function(node) {
                 })) return node;
                 node.definitions.forEach(function(defn) {
                     vars.set(defn.name.name, defn);
-                    ++vars_found;
                 });
                 var seq = node.to_assignments();
                 if (p instanceof AST_ForEnumeration && p.init === node) {
@@ -7865,7 +7899,7 @@ Compressor.prototype.compress = function(node) {
             }
         });
         self.transform(tt);
-        if (vars_found > 0) {
+        if (vars.size() > 0) {
             // collect only vars which don't show up in self's arguments list
             var defns = [];
             if (self instanceof AST_Lambda) self.each_argname(function(argname) {
@@ -9633,8 +9667,16 @@ Compressor.prototype.compress = function(node) {
                 fixed.escaped = def.escaped;
                 name.fixed = fixed;
                 def.references.forEach(function(ref) {
-                    var assigns = ref.fixed && ref.fixed.assigns;
+                    if (!ref.fixed) return;
-                    if (assigns && assigns[0] === defn) assigns[0] = assign;
+                    var assigns = ref.fixed.assigns;
+                    if (!assigns) return;
+                    if (assigns[0] !== defn) return;
+                    if (assigns.length > 1 || ref.fixed.to_binary || ref.fixed.to_prefix) {
+                        assigns[0] = assign;
+                    } else {
+                        ref.fixed = fixed;
+                        if (def.fixed === ref.fixed) def.fixed = fixed;
+                    }
                 });
                 def.references.push(name);
             }
@@ -12901,43 +12943,44 @@ Compressor.prototype.compress = function(node) {
     AST_PropAccess.DEFMETHOD("flatten_object", function(key, compressor) {
         if (!compressor.option("properties")) return;
         if (key === "__proto__") return;
-        var expr = this.expression;
+        var self = this;
-        if (expr instanceof AST_Object) {
+        var expr = self.expression;
-            var props = expr.properties;
+        if (!(expr instanceof AST_Object)) return;
-            for (var i = props.length; --i >= 0;) {
+        var props = expr.properties;
-                var prop = props[i];
+        for (var i = props.length; --i >= 0;) {
-                if (prop.key !== key) continue;
+            var prop = props[i];
-                if (!all(props, can_hoist_property)) return;
+            if (prop.key !== key) continue;
-                if (!safe_to_flatten(prop.value, compressor)) return;
+            if (!all(props, can_hoist_property)) return;
-                var scope, values = [];
+            if (!safe_to_flatten(prop.value, compressor)) return;
-                for (var j = 0; j < props.length; j++) {
+            var call, scope, values = [];
-                    var value = props[j].value;
+            for (var j = 0; j < props.length; j++) {
-                    if (props[j] instanceof AST_ObjectMethod) {
+                var value = props[j].value;
-                        var arrow = !(value.uses_arguments || is_generator(value) || value.contains_this());
+                if (props[j] instanceof AST_ObjectMethod) {
-                        if (arrow) {
+                    var arrow = !(value.uses_arguments || is_generator(value) || value.contains_this());
-                            if (!scope) scope = compressor.find_parent(AST_Scope);
+                    if (arrow) {
-                            var avoid = avoid_await_yield(scope);
+                        if (!scope) scope = compressor.find_parent(AST_Scope);
-                            value.each_argname(function(argname) {
+                        var avoid = avoid_await_yield(scope);
-                                if (avoid[argname.name]) arrow = false;
+                        value.each_argname(function(argname) {
-                            });
+                            if (avoid[argname.name]) arrow = false;
-                        }
+                        });
-                        var ctor;
-                        if (arrow) {
-                            ctor = is_async(value) ? AST_AsyncArrow : AST_Arrow;
-                        } else if (i === j && !(compressor.parent() instanceof AST_Call)) {
-                            return;
-                        } else {
-                            ctor = value.CTOR;
-                        }
-                        value = make_node(ctor, value, value);
                     }
-                    values.push(value);
+                    var ctor;
+                    if (arrow) {
+                        ctor = is_async(value) ? AST_AsyncArrow : AST_Arrow;
+                    } else if (i != j
+                        || (call = compressor.parent()) instanceof AST_Call && call.expression === self) {
+                        ctor = value.CTOR;
+                    } else {
+                        return;
+                    }
+                    value = make_node(ctor, value, value);
                 }
-                return make_node(AST_Sub, this, {
+                values.push(value);
-                    expression: make_node(AST_Array, expr, { elements: values }),
-                    property: make_node(AST_Number, this, { value: i }),
-                });
             }
+            return make_node(AST_Sub, self, {
+                expression: make_node(AST_Array, expr, { elements: values }),
+                property: make_node(AST_Number, self, { value: i }),
+            });
         }
     });
 
@@ -13134,6 +13177,19 @@ Compressor.prototype.compress = function(node) {
         return found;
     }
 
+    function insert_assign(def, assign) {
+        var visited = [];
+        def.references.forEach(function(ref) {
+            var fixed = ref.fixed;
+            if (!fixed || !push_uniq(visited, fixed)) return;
+            if (fixed.assigns) {
+                fixed.assigns.unshift(assign);
+            } else {
+                fixed.assigns = [ assign ];
+            }
+        });
+    }
+
     function init_ref(compressor, name) {
         var sym = make_node(AST_SymbolRef, name, name);
         var assign = make_node(AST_Assign, name, {
@@ -13147,16 +13203,7 @@ Compressor.prototype.compress = function(node) {
                 return assign.right;
             };
             sym.fixed.assigns = [ assign ];
-            var visited = [];
+            insert_assign(def, assign);
-            def.references.forEach(function(ref) {
-                var fixed = ref.fixed;
-                if (!fixed || !push_uniq(visited, fixed)) return;
-                if (fixed.assigns) {
-                    fixed.assigns.unshift(assign);
-                } else {
-                    fixed.assigns = [ assign ];
-                }
-            });
         }
         def.assignments++;
         def.references.push(sym);
@@ -13260,6 +13307,7 @@ Compressor.prototype.compress = function(node) {
             if (fn.body[0] instanceof AST_Directive) return;
             if (fn.contains_this()) return;
             if (!scope) scope = find_scope(compressor);
+            if (in_async_generator(scope)) return;
             var defined = new Dictionary();
             defined.set("NaN", true);
             while (!(scope instanceof AST_Scope)) {
@@ -13364,12 +13412,12 @@ Compressor.prototype.compress = function(node) {
                         if (value) body.push(make_node(AST_SimpleStatement, call, { body: value }));
                         return;
                     }
-                    body.push(make_node(AST_Var, call, {
+                    var defn = make_node(AST_VarDef, call, {
-                        definitions: [ make_node(AST_VarDef, call, {
+                        name: argname.convert_symbol(AST_SymbolVar, process),
-                            name: argname.convert_symbol(AST_SymbolVar, process),
+                        value: value || make_node(AST_Undefined, call).transform(compressor),
-                            value: value || make_node(AST_Undefined, call).transform(compressor),
+                    });
-                        }) ],
+                    if (argname instanceof AST_SymbolFunarg) insert_assign(argname.definition(), defn);
-                    }));
+                    body.push(make_node(AST_Var, call, { definitions: [ defn ] }));
                 });
                 if (values.length) body.push(make_node(AST_SimpleStatement, call, {
                     body: make_sequence(call, values),
@@ -13500,6 +13548,12 @@ Compressor.prototype.compress = function(node) {
         def(AST_LabeledStatement, function(compressor, scope, no_return, in_loop) {
             var body = this.body.try_inline(compressor, scope, no_return, in_loop);
             if (!body) return;
+            if (this.body instanceof AST_IterationStatement && body instanceof AST_BlockStatement) {
+                var loop = body.body.pop();
+                this.body = loop;
+                body.body.push(this);
+                return body;
+            }
             this.body = body;
             return this;
         });

lib/minify.js

@@ -96,15 +96,14 @@ function minify(files, options) {
         }, true);
         if (options.validate) AST_Node.enable_validation();
         var timings = options.timings && { start: Date.now() };
-        if (options.rename === undefined) options.rename = options.compress && options.mangle;
         if (options.annotations !== undefined) set_shorthand("annotations", options, [ "compress", "output" ]);
         if (options.ie8) options.ie = options.ie || options.ie8;
-        if (options.ie) set_shorthand("ie", options, [ "compress", "mangle", "output" ]);
+        if (options.ie) set_shorthand("ie", options, [ "compress", "mangle", "output", "rename" ]);
-        if (options.keep_fargs) set_shorthand("keep_fargs", options, [ "compress", "mangle" ]);
+        if (options.keep_fargs) set_shorthand("keep_fargs", options, [ "compress", "mangle", "rename" ]);
-        if (options.keep_fnames) set_shorthand("keep_fnames", options, [ "compress", "mangle" ]);
+        if (options.keep_fnames) set_shorthand("keep_fnames", options, [ "compress", "mangle", "rename" ]);
-        if (options.toplevel) set_shorthand("toplevel", options, [ "compress", "mangle" ]);
+        if (options.toplevel) set_shorthand("toplevel", options, [ "compress", "mangle", "rename" ]);
-        if (options.v8) set_shorthand("v8", options, [ "mangle", "output" ]);
+        if (options.v8) set_shorthand("v8", options, [ "mangle", "output", "rename" ]);
-        if (options.webkit) set_shorthand("webkit", options, [ "compress", "mangle", "output" ]);
+        if (options.webkit) set_shorthand("webkit", options, [ "compress", "mangle", "output", "rename" ]);
         var quoted_props;
         if (options.mangle) {
             options.mangle = defaults(options.mangle, {
@@ -135,6 +134,7 @@ function minify(files, options) {
             init_cache(options.mangle.cache);
             init_cache(options.mangle.properties.cache);
         }
+        if (options.rename === undefined) options.rename = options.compress && options.mangle;
         if (options.sourceMap) {
             options.sourceMap = defaults(options.sourceMap, {
                 content: null,
@@ -190,8 +190,8 @@ function minify(files, options) {
         if (options.validate) toplevel.validate_ast();
         if (timings) timings.rename = Date.now();
         if (options.rename) {
-            toplevel.figure_out_scope(options.mangle);
+            toplevel.figure_out_scope(options.rename);
-            toplevel.expand_names(options.mangle);
+            toplevel.expand_names(options.rename);
         }
         if (timings) timings.compress = Date.now();
         if (options.compress) {

lib/parse.js

@@ -1194,10 +1194,10 @@ function parse($TEXT, options) {
     }
 
     function for_() {
-        var await = is("name", "await") && next();
+        var await_token = is("name", "await") && next();
         expect("(");
         var init = null;
-        if (await || !is("punc", ";")) {
+        if (await_token || !is("punc", ";")) {
             init = is("keyword", "const")
                 ? (next(), const_(true))
                 : is("name", "let") && is_vardefs()
@@ -1206,7 +1206,7 @@ function parse($TEXT, options) {
                 ? (next(), var_(true))
                 : expression(true);
             var ctor;
-            if (await) {
+            if (await_token) {
                 expect_token("name", "of");
                 ctor = AST_ForAwaitOf;
             } else if (is("operator", "in")) {

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": "3.15.3",
+  "version": "3.15.4",
   "engines": {
     "node": ">=0.8.0"
   },

test/compress.js

@@ -183,13 +183,11 @@ function parse_test(file) {
 function reminify(orig_options, input_code, input_formatted, stdout) {
     for (var i = 0; i < minify_options.length; i++) {
         var options = JSON.parse(minify_options[i]);
-        if (options.compress) [
+        [
             "keep_fargs",
             "keep_fnames",
         ].forEach(function(name) {
-            if (name in orig_options) {
+            if (name in orig_options) options[name] = orig_options[name];
-                options.compress[name] = orig_options[name];
-            }
         });
         var options_formatted = JSON.stringify(options, null, 4);
         options.validate = true;

test/compress/classes.js

@@ -939,6 +939,8 @@ keep_fnames: {
         class Foo {}
         console.log(Foo.name, class Bar {}.name);
     }
+    expect_stdout: "Foo Bar"
+    node_version: ">=4"
 }
 
 issue_805_1: {
@@ -2502,3 +2504,70 @@ issue_5352: {
     expect_stdout: "PASS"
     node_version: ">=12"
 }
+
+issue_5387: {
+    options = {
+        properties: true,
+    }
+    input: {
+        "use strict";
+        (function(a) {
+            try {
+                class A extends a {}
+            } catch (e) {
+                console.log("PASS");
+            }
+        })({
+            f() {
+                return this;
+            }
+        }.f);
+    }
+    expect: {
+        "use strict";
+        (function(a) {
+            try {
+                class A extends a {}
+            } catch (e) {
+                console.log("PASS");
+            }
+        })({
+            f() {
+                return this;
+            }
+        }.f);
+    }
+    expect_stdout: "PASS"
+    node_version: ">=4"
+}
+
+issue_5389: {
+    options = {
+        collapse_vars: true,
+        toplevel: true,
+    }
+    input: {
+        function log(m, n) {
+            console.log(m, n);
+        }
+        var a = log;
+        class A {
+            [a = "FAIL"] = a = "PASS";
+        }
+        var b = new A();
+        log(a, b.FAIL);
+    }
+    expect: {
+        function log(m, n) {
+            console.log(m, n);
+        }
+        var a = log;
+        class A {
+            [a = "FAIL"] = a = "PASS";
+        }
+        var b = new A();
+        log(a, b.FAIL);
+    }
+    expect_stdout: "PASS PASS"
+    node_version: ">=12"
+}

test/compress/collapse_vars.js

@@ -9925,3 +9925,57 @@ issue_5309_2: {
     }
     expect_stdout: "PASS"
 }
+
+issue_5394: {
+    options = {
+        collapse_vars: true,
+        evaluate: true,
+    }
+    input: {
+        try {
+            throw A.p = (console.log("FAIL"), []), !1;
+        } catch (e) {
+            console.log(typeof e);
+        }
+    }
+    expect: {
+        try {
+            throw !(A.p = (console.log("FAIL"), []));
+        } catch (e) {
+            console.log(typeof e);
+        }
+    }
+    expect_stdout: "object"
+}
+
+issue_5396: {
+    options = {
+        collapse_vars: true,
+        merge_vars: true,
+        reduce_vars: true,
+        side_effects: true,
+        unused: true,
+    }
+    input: {
+        var a, b;
+        function f() {}
+        b = 0;
+        new function g(c) {
+            var d = a && g(e), e = ++d, i = [ 42 ];
+            for (var j in i)
+                console.log("PASS"),
+                i;
+        }();
+    }
+    expect: {
+        var a, b;
+        function f() {}
+        b = 0;
+        (function g(c) {
+            a && g();
+            for (var j in [ 42 ])
+                console.log("PASS");
+        })();
+    }
+    expect_stdout: "PASS"
+}

test/compress/default-values.js

@@ -2209,3 +2209,33 @@ issue_5340_3: {
     expect_stdout: "undefined"
     node_version: ">=6"
 }
+
+issue_5407: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+    }
+    input: {
+        (function(a) {
+            for (var i = 0; i < 2; i++)
+                (function(b = 4) {
+                    console.log(b);
+                    a = 2;
+                })(a);
+        })();
+    }
+    expect: {
+        (function(a) {
+            for (var i = 0; i < 2; i++)
+                (function(b = 4) {
+                    console.log(b);
+                    a = 2;
+                })(a);
+        })();
+    }
+    expect_stdout: [
+        "4",
+        "2",
+    ]
+    node_version: ">=6"
+}

test/compress/destructured.js

@@ -3497,3 +3497,41 @@ issue_5370: {
     expect_stdout: true
     node_version: ">=6"
 }
+
+issue_5405_1: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        toplevel: true,
+        unsafe: true,
+    }
+    input: {
+        var [ a ] = [ {} ];
+        console.log(a === a ? "PASS" : "FAIL");
+    }
+    expect: {
+        var [ a ] = [ {} ];
+        console.log(true ? "PASS" : "FAIL");
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}
+
+issue_5405_2: {
+    options = {
+        evaluate: true,
+        reduce_vars: true,
+        toplevel: true,
+        unsafe: true,
+    }
+    input: {
+        var { p: a } = { p: [] };
+        console.log(a === a ? "PASS" : "FAIL");
+    }
+    expect: {
+        var { p: a } = { p: [] };
+        console.log(true ? "PASS" : "FAIL");
+    }
+    expect_stdout: "PASS"
+    node_version: ">=6"
+}

test/compress/evaluate.js

@@ -3349,3 +3349,30 @@ issue_5362_2: {
     }
     expect_stdout: "true"
 }
+
+issue_5380: {
+    options = {
+        evaluate: true,
+        keep_fnames: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = function f(b) {
+            return function g() {
+                for (b in { PASS: 42 });
+            }(), b;
+        }("FAIL");
+        console.log(a);
+    }
+    expect: {
+        var a = function f(b) {
+            return function g() {
+                for (b in { PASS: 42 });
+            }(), b;
+        }("FAIL");
+        console.log(a);
+    }
+    expect_stdout: "PASS"
+}

test/compress/functions.js

@@ -3557,6 +3557,27 @@ functions_inner_var: {
     expect_stdout: "undefined undefined"
 }
 
+functions_keep_fnames: {
+    options = {
+        functions: true,
+        keep_fnames: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var FAIL = function PASS() {};
+        FAIL.p = 42;
+        console.log(FAIL.name, FAIL.p);
+    }
+    expect: {
+        var FAIL = function PASS() {};
+        FAIL.p = 42;
+        console.log(FAIL.name, FAIL.p);
+    }
+    expect_stdout: "PASS 42"
+}
+
 issue_2437: {
     options = {
         collapse_vars: true,
@@ -8329,3 +8350,51 @@ issue_5376_2: {
     }
     expect_stdout: Error("PASS")
 }
+
+issue_5401: {
+    options = {
+        inline: true,
+    }
+    input: {
+        L: for (var a in function() {
+            while (console.log("PASS"));
+        }(), a) do {
+            continue L;
+        } while (console.log("FAIL"));
+    }
+    expect: {
+        while (console.log("PASS"));
+        L: for (var a in a) do {
+            continue L;
+        } while (console.log("FAIL"));
+    }
+    expect_stdout: "PASS"
+}
+
+issue_5409: {
+    options = {
+        inline: true,
+        merge_vars: true,
+        reduce_vars: true,
+        unused: true,
+    }
+    input: {
+        (function(a) {
+            (a = console) || FAIL(a);
+            (function(b) {
+                console.log(b && b);
+                while (!console);
+            })();
+        })();
+    }
+    expect: {
+        (function(a) {
+            (a = console) || FAIL(a);
+            a = void 0;
+            console.log(a && a);
+            while (!console);
+            return;
+        })();
+    }
+    expect_stdout: "undefined"
+}

test/compress/hoist_vars.js

@@ -224,8 +224,7 @@ issue_4489: {
         console.log(k);
     }
     expect: {
-        !(A = 0);
+        for (var k in !(A = 0));
-        for (var k in true);
         console.log(k);
     }
     expect_stdout: "undefined"
@@ -407,9 +406,9 @@ issue_4893_2: {
     expect: {
         try{
             (function() {
-                var b;
+                var a;
-                b = null;
+                a = null;
-                b.p += 42;
+                a.p += 42;
             })();
         } catch (e) {
             console.log("PASS");
@@ -530,3 +529,77 @@ issue_5378: {
         "undefined",
     ]
 }
+
+issue_5411_1: {
+    options = {
+        collapse_vars: true,
+        dead_code: true,
+        hoist_vars: true,
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+    }
+    input: {
+        var a = "PASS";
+        b++;
+        b = a;
+        var b = b, c = c && c[b];
+        console.log(b);
+    }
+    expect: {
+        var b, c, a = "PASS";
+        b++;
+        b = a;
+        c = c && c[b];
+        console.log(b);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_5411_2: {
+    options = {
+        collapse_vars: true,
+        dead_code: true,
+        evaluate: true,
+        hoist_vars: true,
+        reduce_vars: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a = "PASS";
+        b++;
+        b = a;
+        var b = b, c = c && c[b];
+        console.log(b);
+    }
+    expect: {
+        var b, c;
+        b++;
+        b = "PASS",
+        c = c && c[b];
+        console.log(b);
+    }
+    expect_stdout: "PASS"
+}
+
+issue_5411_3: {
+    options = {
+        collapse_vars: true,
+        hoist_vars: true,
+        reduce_vars: true,
+        toplevel: true,
+    }
+    input: {
+        var a = console;
+        a++;
+        var a = A = a;
+        console.log(A);
+    }
+    expect: {
+        var a = console;
+        a = A = ++a;
+        console.log(A);
+    }
+    expect_stdout: "NaN"
+}

test/compress/keep_fargs.js

@@ -1258,8 +1258,7 @@ issues_3267_1: {
     }
     expect: {
         !function() {
-            var i = Object();
+            if (Object())
-            if (i)
                 return console.log("PASS");
             throw "FAIL";
         }();

test/compress/reduce_vars.js

@@ -6689,8 +6689,7 @@ issues_3267_1: {
     }
     expect: {
         !function(x) {
-            var i = Object();
+            if (Object())
-            if (i)
                 return console.log("PASS");
             throw "FAIL";
         }();

test/compress/rests.js

@@ -1323,3 +1323,43 @@ issue_5370: {
     expect_stdout: true
     node_version: ">=6"
 }
+
+issue_5391: {
+    options = {
+        evaluate: true,
+        keep_fargs: false,
+        objects: true,
+        pure_getters: "strict",
+        reduce_vars: true,
+        side_effects: true,
+        toplevel: true,
+        unused: true,
+    }
+    input: {
+        var a, b = function f({
+            p: {},
+            ...c
+        }) {
+            while (c.q);
+        }({
+            p: {
+                r: a++,
+                r: 0,
+            }
+        });
+        console.log(a);
+    }
+    expect: {
+        (function({
+            p: {},
+            ...c
+        }) {
+            while (c.q);
+        })({
+            p: 0,
+        });
+        console.log(NaN);
+    }
+    expect_stdout: "NaN"
+    node_version: ">=8.3.0"
+}

test/compress/spreads.js

@@ -1166,3 +1166,31 @@ issue_5006: {
     expect_stdout: "PASS"
     node_version: ">=6"
 }
+
+issue_5382: {
+    options = {
+        side_effects: true,
+    }
+    input: {
+        ({
+            f() {
+                ({ ...this });
+            },
+            get p() {
+                console.log("PASS");
+            },
+        }).f();
+    }
+    expect: {
+        ({
+            f() {
+                ({ ...this });
+            },
+            get p() {
+                console.log("PASS");
+            },
+        }).f();
+    }
+    expect_stdout: "PASS"
+    node_version: ">=8.3.0"
+}

test/compress/yields.js

@@ -1451,3 +1451,77 @@ issue_5177: {
     expect_stdout: "function"
     node_version: ">=4"
 }
+
+issue_5385_1: {
+    options = {
+        inline: true,
+    }
+    input: {
+        (async function*() {
+            (function() {
+                try {
+                    return console.log("foo");
+                } finally {
+                    return console.log("bar");
+                }
+                console.log("baz");
+            })();
+        })().next();
+        console.log("moo");
+    }
+    expect: {
+        (async function*() {
+            (function() {
+                try {
+                    return console.log("foo");
+                } finally {
+                    return console.log("bar");
+                }
+                console.log("baz");
+            })();
+        })().next();
+        console.log("moo");
+    }
+    expect_stdout: [
+        "foo",
+        "bar",
+        "moo",
+    ]
+    node_version: ">=10"
+}
+
+issue_5385_2: {
+    options = {
+        inline: true,
+    }
+    input: {
+        (async function*() {
+            return function() {
+                try {
+                    return console.log("foo");
+                } finally {
+                    return console.log("bar");
+                }
+            }();
+        })().next();
+        console.log("moo");
+    }
+    expect: {
+        (async function*() {
+            return function() {
+                try {
+                    return console.log("foo");
+                } finally {
+                    return console.log("bar");
+                }
+            }();
+        })().next();
+        console.log("moo");
+    }
+    expect_stdout: [
+        "foo",
+        "bar",
+        "moo",
+    ]
+    node_version: ">=10"
+}

test/mocha/reduce.js

@@ -434,7 +434,7 @@ describe("test/reduce.js", function() {
             "// }",
         ].join("\n"));
     });
-    it("Should transform `export default` correctly", function() {
+    it("Should transform `export default class` correctly", function() {
         var result = reduce_test(read("test/input/reduce/export_default.js"), {
             compress: false,
             toplevel: true,
@@ -448,4 +448,41 @@ describe("test/reduce.js", function() {
             "// }",
         ].join("\n"));
     });
+    it("Should transform `export default function` correctly", function() {
+        var code = [
+            "for (var k in this)",
+            "    console.log(k);",
+            "export default (function f() {});",
+            "console.log(k);",
+        ].join("\n");
+        var result = reduce_test(code, {
+            mangle: false,
+        });
+        if (result.error) throw result.error;
+        assert.strictEqual(result.code, [
+            "// Can't reproduce test failure",
+            "// minify options: {",
+            '//   "mangle": false',
+            "// }",
+        ].join("\n"));
+    });
+    it("Should transform `export default (42)` correctly", function() {
+        var code = [
+            "export default (42);",
+            "for (var k in this)",
+            "    console.log(k);",
+        ].join("\n");
+        var result = reduce_test(code, {
+            compress: false,
+            mangle: false,
+        });
+        if (result.error) throw result.error;
+        assert.strictEqual(result.code, [
+            "// Can't reproduce test failure",
+            "// minify options: {",
+            '//   "compress": false,',
+            '//   "mangle": false',
+            "// }",
+        ].join("\n"));
+    });
 });

test/sandbox.js

@@ -52,12 +52,14 @@ exports.same_stdout = semver.satisfies(process.version, "0.12") ? function(expec
     return typeof expected == typeof actual && strip_func_ids(expected) == strip_func_ids(actual);
 };
 exports.patch_module_statements = function(code) {
-    var count = 0, imports = [];
+    var count = 0, has_default = "", imports = [];
     code = code.replace(/\bexport(?:\s*\{[^{}]*}\s*?(?:$|\n|;)|\s+default\b(?:\s*(\(|\{|class\s*\{|class\s+(?=extends\b)|(?:async\s+)?function\s*(?:\*\s*)?\())?|\b)/g, function(match, header) {
+        if (/^export\s+default/.test(match)) has_default = "var _uglify_export_default_;";
         if (!header) return "";
         if (header.length == 1) return "0, " + header;
-        do {
+        var name = "_uglify_export_default_";
-            var name = "_export_default_" + ++count;
+        if (/^class\b/.test(header)) do {
+            name = "_uglify_export_default_" + ++count;
         } while (code.indexOf(name) >= 0);
         return header.slice(0, -1) + " " + name + header.slice(-1);
     }).replace(/\bimport\.meta\b/g, function() {
@@ -76,7 +78,7 @@ exports.patch_module_statements = function(code) {
         return "";
     });
     imports.push("");
-    return imports.join("\n") + code;
+    return has_default + imports.join("\n") + code;
 };
 
 function is_error(result) {