fix build issues and add typedoc

9 files changed, 316 insertions, 200 deletions

diff --git a/node_modules/uglify-js/README.md b/node_modules/uglify-js/README.md
index d15f114ce..8c1d67642 100644
--- a/node_modules/uglify-js/README.md
+++ b/node_modules/uglify-js/README.md
@@ -11,9 +11,10 @@ There's also an
 Chrome and probably Safari).
 
 #### Note:
-- release versions of `uglify-js` only support ECMAScript 5 (ES5). If you wish to minify
-ES2015+ (ES6+) code then please use the [harmony](#harmony) development branch.
-- Node 7 has a known performance regression and runs `uglify-js` twice as slow.
+- `uglify-js` only supports ECMAScript 5 (ES5).
+- Support for `const` is [present but incomplete](#support-for-const), and may not be
+  transformed properly.
+- Those wishing to minify ES2015+ (ES6+) should use the `npm` package [**uglify-es**](https://github.com/mishoo/UglifyJS2/tree/harmony).
 
 Install
 -------
@@ -29,12 +30,6 @@ From NPM for programmatic use:
 
     npm install uglify-js
 
-From Git:
-
-    git clone git://github.com/mishoo/UglifyJS2.git
-    cd UglifyJS2
-    npm link .
-
 Usage
 -----
 
@@ -358,6 +353,9 @@ to set `true`; it's effectively a shortcut for `foo=true`).
 - `unsafe_proto` (default: false) -- optimize expressions like
   `Array.prototype.slice.call(a)` into `[].slice.call(a)`
 
+- `unsafe_regexp` (default: false) -- enable substitutions of variables with
+  `RegExp` values the same way as if they are constants.
+
 - `conditionals` -- apply optimizations for `if`-s and conditional
   expressions
 
@@ -441,13 +439,19 @@ to set `true`; it's effectively a shortcut for `foo=true`).
   compressor from discarding function names.  Useful for code relying on
   `Function.prototype.name`. See also: the `keep_fnames` [mangle option](#mangle).
 
-- `passes` -- default `1`. Number of times to run compress. Use an
-  integer argument larger than 1 to further reduce code size in some cases.
-  Note: raising the number of passes will increase uglify compress time.
+- `passes` -- default `1`. Number of times to run compress with a maximum of 3.
+  In some cases more than one pass leads to further compressed code.  Keep in
+  mind more passes will take more time.
 
 - `keep_infinity` -- default `false`. Pass `true` to prevent `Infinity` from
   being compressed into `1/0`, which may cause performance issues on Chrome.
 
+- `side_effects` -- default `true`. Pass `false` to disable potentially dropping
+  functions marked as "pure".  A function call is marked as "pure" if a comment
+  annotation `/*@__PURE__*/` or `/*#__PURE__*/` immediately precedes the call. For
+  example: `/*@__PURE__*/foo();`
+
+
 ### The `unsafe` option
 
 It enables some transformations that *might* break code logic in certain
@@ -983,19 +987,9 @@ The `source_map_options` (optional) can contain the following properties:
   [compressor]: http://lisperator.net/uglifyjs/compress
   [parser]: http://lisperator.net/uglifyjs/parser
 
-#### Harmony
-
-If you wish to use the experimental [harmony](https://github.com/mishoo/UglifyJS2/commits/harmony)
-branch to minify ES2015+ (ES6+) code please use the following in your `package.json` file:
-
-```
-"uglify-js": "git+https://github.com/mishoo/UglifyJS2.git#harmony"
-```
-
-or to directly install the experimental harmony version of uglify:
-
-```
-npm install --save-dev uglify-js@github:mishoo/UglifyJS2#harmony
-```
+#### Support for `const`
 
-See [#448](https://github.com/mishoo/UglifyJS2/issues/448) for additional details.
+`const` in `uglify-js@2.x` has function scope and as such behaves much like
+`var` - unlike `const` in ES2015 (ES6) which has block scope. It is recommended
+to avoid using `const` for this reason as it will have undefined behavior when
+run on an ES2015 compatible browser.
diff --git a/node_modules/uglify-js/bin/uglifyjs b/node_modules/uglify-js/bin/uglifyjs
index 635ca3651..63b2f26f1 100755
--- a/node_modules/uglify-js/bin/uglifyjs
+++ b/node_modules/uglify-js/bin/uglifyjs
@@ -367,19 +367,19 @@ var index = 0;
                     if (ex instanceof UglifyJS.JS_Parse_Error) {
                         print_error("Parse error at " + file + ":" + ex.line + "," + ex.col);
                         var col = ex.col;
-                        var line = code.split(/\r?\n/)[ex.line - (col ? 1 : 2)];
+                        var lines = code.split(/\r?\n/);
+                        var line = lines[ex.line - 1];
+                        if (!line && !col) {
+                            line = lines[ex.line - 2];
+                            col = line.length;
+                        }
                         if (line) {
                             if (col > 40) {
                                 line = line.slice(col - 40);
                                 col = 40;
                             }
-                            if (col) {
-                                print_error(line.slice(0, 80));
-                                print_error(line.slice(0, col).replace(/\S/g, " ") + "^");
-                            } else {
-                                print_error(line.slice(-40));
-                                print_error(line.slice(-40).replace(/\S/g, " ") + "^");
-                            }
+                            print_error(line.slice(0, 80));
+                            print_error(line.slice(0, col).replace(/\S/g, " ") + "^");
                         }
                         print_error(ex.stack);
                         process.exit(1);
diff --git a/node_modules/uglify-js/lib/ast.js b/node_modules/uglify-js/lib/ast.js
index ba1330f40..028772f3f 100644
--- a/node_modules/uglify-js/lib/ast.js
+++ b/node_modules/uglify-js/lib/ast.js
@@ -214,12 +214,13 @@ var AST_LabeledStatement = DEFNODE("LabeledStatement", "label", {
     clone: function(deep) {
         var node = this._clone(deep);
         if (deep) {
-            var refs = node.label.references;
-            var label = this.label;
+            var label = node.label;
+            var def = this.label;
             node.walk(new TreeWalker(function(node) {
                 if (node instanceof AST_LoopControl
-                    && node.label && node.label.thedef === label) {
-                    refs.push(node);
+                    && node.label && node.label.thedef === def) {
+                    node.label.thedef = label;
+                    label.references.push(node);
                 }
             }));
         }
@@ -797,8 +798,8 @@ var AST_Object = DEFNODE("Object", "properties", {
 var AST_ObjectProperty = DEFNODE("ObjectProperty", "key value", {
     $documentation: "Base class for literal object properties",
     $propdoc: {
-        key: "[string] the property name converted to a string for ObjectKeyVal.  For setters and getters this is an arbitrary AST_Node.",
-        value: "[AST_Node] property value.  For setters and getters this is an AST_Function."
+        key: "[string] the property name converted to a string for ObjectKeyVal.  For setters and getters this is an AST_SymbolAccessor.",
+        value: "[AST_Node] property value.  For setters and getters this is an AST_Accessor."
     },
     _walk: function(visitor) {
         return visitor._visit(this, function(){
diff --git a/node_modules/uglify-js/lib/compress.js b/node_modules/uglify-js/lib/compress.js
index 1d9258cf6..d8a491ebc 100644
--- a/node_modules/uglify-js/lib/compress.js
+++ b/node_modules/uglify-js/lib/compress.js
@@ -84,6 +84,7 @@ function Compressor(options, false_by_default) {
         unsafe_comps  : false,
         unsafe_math   : false,
         unsafe_proto  : false,
+        unsafe_regexp : false,
         unused        : !false_by_default,
         warnings      : true,
     }, true);
@@ -271,6 +272,14 @@ merge(Compressor.prototype, {
                     if (d.fixed === undefined || !is_safe(d)
                         || is_modified(node, 0, node.fixed_value() instanceof AST_Lambda)) {
                         d.fixed = false;
+                    } else {
+                        var parent = tw.parent();
+                        if (parent instanceof AST_Assign && parent.operator == "=" && node === parent.right
+                            || parent instanceof AST_Call && node !== parent.expression
+                            || parent instanceof AST_Return && node === parent.value && node.scope !== d.scope
+                            || parent instanceof AST_VarDef && node === parent.value) {
+                            d.escaped = true;
+                        }
                     }
                 }
                 if (node instanceof AST_SymbolCatch) {
@@ -308,21 +317,55 @@ merge(Compressor.prototype, {
                     safe_ids = save_ids;
                     return true;
                 }
-                var iife;
-                if (node instanceof AST_Function
-                    && !node.name
-                    && (iife = tw.parent()) instanceof AST_Call
-                    && iife.expression === node) {
-                    // Virtually turn IIFE parameters into variable definitions:
-                    //   (function(a,b) {...})(c,d) => (function() {var a=c,b=d; ...})()
-                    // So existing transformation rules can work on them.
-                    node.argnames.forEach(function(arg, i) {
-                        var d = arg.definition();
-                        d.fixed = function() {
-                            return iife.args[i] || make_node(AST_Undefined, iife);
-                        };
-                        mark(d, true);
-                    });
+                if (node instanceof AST_Function) {
+                    push();
+                    var iife;
+                    if (!node.name
+                        && (iife = tw.parent()) instanceof AST_Call
+                        && iife.expression === node) {
+                        // Virtually turn IIFE parameters into variable definitions:
+                        //   (function(a,b) {...})(c,d) => (function() {var a=c,b=d; ...})()
+                        // So existing transformation rules can work on them.
+                        node.argnames.forEach(function(arg, i) {
+                            var d = arg.definition();
+                            if (!node.uses_arguments && d.fixed === undefined) {
+                                d.fixed = function() {
+                                    return iife.args[i] || make_node(AST_Undefined, iife);
+                                };
+                                mark(d, true);
+                            } else {
+                                d.fixed = false;
+                            }
+                        });
+                    }
+                    descend();
+                    pop();
+                    return true;
+                }
+                if (node instanceof AST_Accessor) {
+                    var save_ids = safe_ids;
+                    safe_ids = Object.create(null);
+                    descend();
+                    safe_ids = save_ids;
+                    return true;
+                }
+                if (node instanceof AST_Binary
+                    && (node.operator == "&&" || node.operator == "||")) {
+                    node.left.walk(tw);
+                    push();
+                    node.right.walk(tw);
+                    pop();
+                    return true;
+                }
+                if (node instanceof AST_Conditional) {
+                    node.condition.walk(tw);
+                    push();
+                    node.consequent.walk(tw);
+                    pop();
+                    push();
+                    node.alternative.walk(tw);
+                    pop();
+                    return true;
                 }
                 if (node instanceof AST_If || node instanceof AST_DWLoop) {
                     node.condition.walk(tw);
@@ -359,7 +402,19 @@ merge(Compressor.prototype, {
                     pop();
                     return true;
                 }
-                if (node instanceof AST_Catch || node instanceof AST_SwitchBranch) {
+                if (node instanceof AST_Try) {
+                    push();
+                    walk_body(node, tw);
+                    pop();
+                    if (node.bcatch) {
+                        push();
+                        node.bcatch.walk(tw);
+                        pop();
+                    }
+                    if (node.bfinally) node.bfinally.walk(tw);
+                    return true;
+                }
+                if (node instanceof AST_SwitchBranch) {
                     push();
                     descend();
                     pop();
@@ -393,7 +448,10 @@ merge(Compressor.prototype, {
         }
 
         function reset_def(def) {
-            if (toplevel || !def.global || def.orig[0] instanceof AST_SymbolConst) {
+            def.escaped = false;
+            if (def.scope.uses_eval) {
+                def.fixed = false;
+            } else if (toplevel || !def.global || def.orig[0] instanceof AST_SymbolConst) {
                 def.fixed = undefined;
             } else {
                 def.fixed = false;
@@ -419,6 +477,14 @@ merge(Compressor.prototype, {
         return fixed();
     });
 
+    function is_reference_const(ref) {
+        if (!(ref instanceof AST_SymbolRef)) return false;
+        var orig = ref.definition().orig;
+        for (var i = orig.length; --i >= 0;) {
+            if (orig[i] instanceof AST_SymbolConst) return true;
+        }
+    }
+
     function find_variable(compressor, name) {
         var scope, i = 0;
         while (scope = compressor.parent(i++)) {
@@ -1160,12 +1226,12 @@ merge(Compressor.prototype, {
                 && !node.expression.has_side_effects(compressor);
     }
 
-    // may_eq_null()
-    // returns true if this node may evaluate to null or undefined
+    // may_throw_on_access()
+    // returns true if this node may be null, undefined or contain `AST_Accessor`
     (function(def) {
-        AST_Node.DEFMETHOD("may_eq_null", function(compressor) {
+        AST_Node.DEFMETHOD("may_throw_on_access", function(compressor) {
             var pure_getters = compressor.option("pure_getters");
-            return !pure_getters || this._eq_null(pure_getters);
+            return !pure_getters || this._throw_on_access(pure_getters);
         });
 
         function is_strict(pure_getters) {
@@ -1177,7 +1243,12 @@ merge(Compressor.prototype, {
         def(AST_Undefined, return_true);
         def(AST_Constant, return_false);
         def(AST_Array, return_false);
-        def(AST_Object, return_false);
+        def(AST_Object, function(pure_getters) {
+            if (!is_strict(pure_getters)) return false;
+            for (var i = this.properties.length; --i >=0;)
+                if (this.properties[i].value instanceof AST_Accessor) return true;
+            return false;
+        });
         def(AST_Function, return_false);
         def(AST_UnaryPostfix, return_false);
         def(AST_UnaryPrefix, function() {
@@ -1186,33 +1257,33 @@ merge(Compressor.prototype, {
         def(AST_Binary, function(pure_getters) {
             switch (this.operator) {
               case "&&":
-                return this.left._eq_null(pure_getters);
+                return this.left._throw_on_access(pure_getters);
               case "||":
-                return this.left._eq_null(pure_getters)
-                    && this.right._eq_null(pure_getters);
+                return this.left._throw_on_access(pure_getters)
+                    && this.right._throw_on_access(pure_getters);
               default:
                 return false;
             }
         })
         def(AST_Assign, function(pure_getters) {
             return this.operator == "="
-                && this.right._eq_null(pure_getters);
+                && this.right._throw_on_access(pure_getters);
         })
         def(AST_Conditional, function(pure_getters) {
-            return this.consequent._eq_null(pure_getters)
-                || this.alternative._eq_null(pure_getters);
+            return this.consequent._throw_on_access(pure_getters)
+                || this.alternative._throw_on_access(pure_getters);
         })
         def(AST_Seq, function(pure_getters) {
-            return this.cdr._eq_null(pure_getters);
+            return this.cdr._throw_on_access(pure_getters);
         });
         def(AST_SymbolRef, function(pure_getters) {
             if (this.is_undefined) return true;
             if (!is_strict(pure_getters)) return false;
             var fixed = this.fixed_value();
-            return !fixed || fixed._eq_null(pure_getters);
+            return !fixed || fixed._throw_on_access(pure_getters);
         });
     })(function(node, func) {
-        node.DEFMETHOD("_eq_null", func);
+        node.DEFMETHOD("_throw_on_access", func);
     });
 
     /* -----[ boolean/negation helpers ]----- */
@@ -1549,23 +1620,20 @@ merge(Compressor.prototype, {
                 : ev(this.alternative, compressor);
         });
         def(AST_SymbolRef, function(compressor){
-            if (this._evaluating) throw def;
+            if (!compressor.option("reduce_vars") || this._evaluating) throw def;
             this._evaluating = true;
             try {
                 var fixed = this.fixed_value();
-                if (compressor.option("reduce_vars") && fixed) {
-                    if (compressor.option("unsafe")) {
-                        if (!HOP(fixed, "_evaluated")) {
-                            fixed._evaluated = ev(fixed, compressor);
-                        }
-                        return fixed._evaluated;
-                    }
-                    return ev(fixed, compressor);
-                }
+                if (!fixed) throw def;
+                var value = ev(fixed, compressor);
+                if (!HOP(fixed, "_eval")) fixed._eval = function() {
+                    return value;
+                };
+                if (value && typeof value == "object" && this.definition().escaped) throw def;
+                return value;
             } finally {
                 this._evaluating = false;
             }
-            throw def;
         });
         def(AST_PropAccess, function(compressor){
             if (compressor.option("unsafe")) {
@@ -1755,11 +1823,11 @@ merge(Compressor.prototype, {
             return any(this.elements, compressor);
         });
         def(AST_Dot, function(compressor){
-            return this.expression.may_eq_null(compressor)
+            return this.expression.may_throw_on_access(compressor)
                 || this.expression.has_side_effects(compressor);
         });
         def(AST_Sub, function(compressor){
-            return this.expression.may_eq_null(compressor)
+            return this.expression.may_throw_on_access(compressor)
                 || this.expression.has_side_effects(compressor)
                 || this.property.has_side_effects(compressor);
         });
@@ -1891,6 +1959,7 @@ merge(Compressor.prototype, {
                         && node instanceof AST_Assign
                         && node.operator == "="
                         && node.left instanceof AST_SymbolRef
+                        && !is_reference_const(node.left)
                         && scope === self) {
                         node.right.walk(tw);
                         return true;
@@ -1980,7 +2049,7 @@ merge(Compressor.prototype, {
                         }
                         return node;
                     }
-                    if (drop_vars && node instanceof AST_Definitions && !(tt.parent() instanceof AST_ForIn)) {
+                    if (drop_vars && node instanceof AST_Definitions && !(tt.parent() instanceof AST_ForIn && tt.parent().init === node)) {
                         var def = node.definitions.filter(function(def){
                             if (def.value) def.value = def.value.transform(tt);
                             var sym = def.name.definition();
@@ -2058,26 +2127,32 @@ merge(Compressor.prototype, {
                             return maintain_this_binding(tt.parent(), node, node.right.transform(tt));
                         }
                     }
+                    // certain combination of unused name + side effect leads to:
+                    //    https://github.com/mishoo/UglifyJS2/issues/44
+                    //    https://github.com/mishoo/UglifyJS2/issues/1830
+                    // that's an invalid AST.
+                    // We fix it at this stage by moving the `var` outside the `for`.
                     if (node instanceof AST_For) {
                         descend(node, this);
-
                         if (node.init instanceof AST_BlockStatement) {
-                            // certain combination of unused name + side effect leads to:
-                            //    https://github.com/mishoo/UglifyJS2/issues/44
-                            // that's an invalid AST.
-                            // We fix it at this stage by moving the `var` outside the `for`.
-
-                            var body = node.init.body.slice(0, -1);
-                            node.init = node.init.body.slice(-1)[0].body;
-                            body.push(node);
-
-                            return in_list ? MAP.splice(body) : make_node(AST_BlockStatement, node, {
-                                body: body
-                            });
+                            var block = node.init;
+                            node.init = block.body.pop();
+                            block.body.push(node);
+                            return in_list ? MAP.splice(block.body) : block;
                         } else if (is_empty(node.init)) {
                             node.init = null;
-                            return node;
                         }
+                        return node;
+                    }
+                    if (node instanceof AST_LabeledStatement && node.body instanceof AST_For) {
+                        descend(node, this);
+                        if (node.body instanceof AST_BlockStatement) {
+                            var block = node.body;
+                            node.body = block.body.pop();
+                            block.body.push(node);
+                            return in_list ? MAP.splice(block.body) : block;
+                        }
+                        return node;
                     }
                     if (node instanceof AST_Scope && node !== self)
                         return node;
@@ -2256,6 +2331,7 @@ merge(Compressor.prototype, {
             var args = trim(this.args, compressor, first_in_statement);
             return args && AST_Seq.from_array(args);
         });
+        def(AST_Accessor, return_null);
         def(AST_Function, return_null);
         def(AST_Binary, function(compressor, first_in_statement){
             var right = this.right.drop_side_effect_free(compressor);
@@ -2326,11 +2402,11 @@ merge(Compressor.prototype, {
             return values && AST_Seq.from_array(values);
         });
         def(AST_Dot, function(compressor, first_in_statement){
-            if (this.expression.may_eq_null(compressor)) return this;
+            if (this.expression.may_throw_on_access(compressor)) return this;
             return this.expression.drop_side_effect_free(compressor, first_in_statement);
         });
         def(AST_Sub, function(compressor, first_in_statement){
-            if (this.expression.may_eq_null(compressor)) return this;
+            if (this.expression.may_throw_on_access(compressor)) return this;
             var expression = this.expression.drop_side_effect_free(compressor, first_in_statement);
             if (!expression) return this.property.drop_side_effect_free(compressor, first_in_statement);
             var property = this.property.drop_side_effect_free(compressor);
@@ -2380,7 +2456,7 @@ merge(Compressor.prototype, {
             if (compressor.option("dead_code") && self instanceof AST_While) {
                 var a = [];
                 extract_declarations_from_unreachable_code(compressor, self.body, a);
-                return make_node(AST_BlockStatement, self, { body: a });
+                return make_node(AST_BlockStatement, self, { body: a }).optimize(compressor);
             }
             if (self instanceof AST_Do) {
                 var has_loop_control = false;
@@ -2389,7 +2465,8 @@ merge(Compressor.prototype, {
                     if (node instanceof AST_LoopControl && tw.loopcontrol_target(node) === self)
                         return has_loop_control = true;
                 });
-                self.walk(tw);
+                var parent = compressor.parent();
+                (parent instanceof AST_LabeledStatement ? parent : self).walk(tw);
                 if (!has_loop_control) return self.body;
             }
         }
@@ -2459,7 +2536,7 @@ merge(Compressor.prototype, {
                     }));
                 }
                 extract_declarations_from_unreachable_code(compressor, self.body, a);
-                return make_node(AST_BlockStatement, self, { body: a });
+                return make_node(AST_BlockStatement, self, { body: a }).optimize(compressor);
             }
             if (cond !== self.condition) {
                 cond = make_node_from_constant(cond, self.condition).transform(compressor);
@@ -2711,9 +2788,9 @@ merge(Compressor.prototype, {
             var body = [];
             if (self.bcatch) extract_declarations_from_unreachable_code(compressor, self.bcatch, body);
             if (self.bfinally) body = body.concat(self.bfinally.body);
-            return body.length > 0 ? make_node(AST_BlockStatement, self, {
+            return make_node(AST_BlockStatement, self, {
                 body: body
-            }).optimize(compressor) : make_node(AST_EmptyStatement, self);
+            }).optimize(compressor);
         }
         return self;
     });
@@ -3041,7 +3118,8 @@ merge(Compressor.prototype, {
             }
             if (left
                 && !(left instanceof AST_SymbolRef
-                    && left.definition().orig[0] instanceof AST_SymbolLambda)) {
+                    && (left.definition().orig[0] instanceof AST_SymbolLambda
+                        || is_reference_const(left)))) {
                 var parent, field;
                 var cdr = self.cdr;
                 while (true) {
@@ -3595,29 +3673,55 @@ merge(Compressor.prototype, {
                 return make_node(AST_Infinity, self).optimize(compressor);
             }
         }
-        if (compressor.option("evaluate") && compressor.option("reduce_vars")) {
+        if (compressor.option("evaluate")
+            && compressor.option("reduce_vars")
+            && is_lhs(self, compressor.parent()) !== self) {
             var d = self.definition();
             var fixed = self.fixed_value();
             if (fixed) {
                 if (d.should_replace === undefined) {
                     var init = fixed.evaluate(compressor);
-                    if (init !== fixed) {
+                    if (init !== fixed && (compressor.option("unsafe_regexp") || !(init instanceof RegExp))) {
                         init = make_node_from_constant(init, fixed);
-                        var value = best_of_expression(init.optimize(compressor), fixed).print_to_string().length;
+                        var value = init.optimize(compressor).print_to_string().length;
+                        var fn;
+                        if (has_symbol_ref(fixed)) {
+                            fn = function() {
+                                var result = init.optimize(compressor);
+                                return result === init ? result.clone(true) : result;
+                            };
+                        } else {
+                            value = Math.min(value, fixed.print_to_string().length);
+                            fn = function() {
+                                var result = best_of_expression(init.optimize(compressor), fixed);
+                                return result === init || result === fixed ? result.clone(true) : result;
+                            };
+                        }
                         var name = d.name.length;
-                        var freq = d.references.length;
-                        var overhead = d.global || !freq ? 0 : (name + 2 + value) / freq;
-                        d.should_replace = value <= name + overhead ? init : false;
+                        var overhead = 0;
+                        if (compressor.option("unused") && (!d.global || compressor.option("toplevel"))) {
+                            overhead = (name + 2 + value) / d.references.length;
+                        }
+                        d.should_replace = value <= name + overhead ? fn : false;
                     } else {
                         d.should_replace = false;
                     }
                 }
                 if (d.should_replace) {
-                    return best_of_expression(d.should_replace.optimize(compressor), fixed).clone(true);
+                    return d.should_replace();
                 }
             }
         }
         return self;
+
+        function has_symbol_ref(value) {
+            var found;
+            value.walk(new TreeWalker(function(node) {
+                if (node instanceof AST_SymbolRef) found = true;
+                if (found) return true;
+            }));
+            return found;
+        }
     });
 
     function is_atomic(lhs, self) {
diff --git a/node_modules/uglify-js/lib/mozilla-ast.js b/node_modules/uglify-js/lib/mozilla-ast.js
index 12b55dc5b..88a2eb59f 100644
--- a/node_modules/uglify-js/lib/mozilla-ast.js
+++ b/node_modules/uglify-js/lib/mozilla-ast.js
@@ -111,23 +111,19 @@
         },
         Property: function(M) {
             var key = M.key;
-            var name = key.type == "Identifier" ? key.name : key.value;
             var args = {
                 start    : my_start_token(key),
                 end      : my_end_token(M.value),
-                key      : name,
+                key      : key.type == "Identifier" ? key.name : key.value,
                 value    : from_moz(M.value)
             };
-            switch (M.kind) {
-              case "init":
-                return new AST_ObjectKeyVal(args);
-              case "set":
-                args.value.name = from_moz(key);
-                return new AST_ObjectSetter(args);
-              case "get":
-                args.value.name = from_moz(key);
-                return new AST_ObjectGetter(args);
-            }
+            if (M.kind == "init") return new AST_ObjectKeyVal(args);
+            args.key = new AST_SymbolAccessor({
+                name: args.key
+            });
+            args.value = new AST_Accessor(args.value);
+            if (M.kind == "get") return new AST_ObjectGetter(args);
+            if (M.kind == "set") return new AST_ObjectSetter(args);
         },
         ArrayExpression: function(M) {
             return new AST_Array({
@@ -256,10 +252,7 @@
     map("CallExpression", AST_Call, "callee>expression, arguments@args");
 
     def_to_moz(AST_Toplevel, function To_Moz_Program(M) {
-        return {
-            type: "Program",
-            body: M.body.map(to_moz)
-        };
+        return to_moz_scope("Program", M);
     });
 
     def_to_moz(AST_Defun, function To_Moz_FunctionDeclaration(M) {
@@ -267,7 +260,7 @@
             type: "FunctionDeclaration",
             id: to_moz(M.name),
             params: M.argnames.map(to_moz),
-            body: to_moz_block(M)
+            body: to_moz_scope("BlockStatement", M)
         }
     });
 
@@ -276,7 +269,7 @@
             type: "FunctionExpression",
             id: to_moz(M.name),
             params: M.argnames.map(to_moz),
-            body: to_moz_block(M)
+            body: to_moz_scope("BlockStatement", M)
         }
     });
 
@@ -382,11 +375,10 @@
     });
 
     def_to_moz(AST_ObjectProperty, function To_Moz_Property(M) {
-        var key = (
-            is_identifier(M.key)
-            ? {type: "Identifier", name: M.key}
-            : {type: "Literal", value: M.key}
-        );
+        var key = {
+            type: "Literal",
+            value: M.key instanceof AST_SymbolAccessor ? M.key.name : M.key
+        };
         var kind;
         if (M instanceof AST_ObjectKeyVal) {
             kind = "init";
@@ -547,8 +539,8 @@
         moz_to_me = new Function("U2", "my_start_token", "my_end_token", "from_moz", "return(" + moz_to_me + ")")(
             exports, my_start_token, my_end_token, from_moz
         );
-        me_to_moz = new Function("to_moz", "to_moz_block", "return(" + me_to_moz + ")")(
-            to_moz, to_moz_block
+        me_to_moz = new Function("to_moz", "to_moz_block", "to_moz_scope", "return(" + me_to_moz + ")")(
+            to_moz, to_moz_block, to_moz_scope
         );
         MOZ_TO_ME[moztype] = moz_to_me;
         def_to_moz(mytype, me_to_moz);
@@ -606,4 +598,14 @@
         };
     };
 
+    function to_moz_scope(type, node) {
+        var body = node.body.map(to_moz);
+        if (node.body[0] instanceof AST_SimpleStatement && node.body[0].body instanceof AST_String) {
+            body.unshift(to_moz(new AST_EmptyStatement(node.body[0])));
+        }
+        return {
+            type: type,
+            body: body
+        };
+    };
 })();
diff --git a/node_modules/uglify-js/lib/output.js b/node_modules/uglify-js/lib/output.js
index 9ac50c08a..0731fb492 100644
--- a/node_modules/uglify-js/lib/output.js
+++ b/node_modules/uglify-js/lib/output.js
@@ -190,11 +190,7 @@ function OutputStream(options) {
     var might_need_space = false;
     var might_need_semicolon = false;
     var might_add_newline = 0;
-    var last = null;
-
-    function last_char() {
-        return last.charAt(last.length - 1);
-    };
+    var last = "";
 
     var ensure_line_len = options.max_line_len ? function() {
         if (current_col > options.max_line_len) {
@@ -218,10 +214,11 @@ function OutputStream(options) {
     function print(str) {
         str = String(str);
         var ch = str.charAt(0);
+        var prev = last.charAt(last.length - 1);
         if (might_need_semicolon) {
             might_need_semicolon = false;
 
-            if ((!ch || ";}".indexOf(ch) < 0) && !/[;]$/.test(last)) {
+            if (prev == ":" && ch == "}" || (!ch || ";}".indexOf(ch) < 0) && prev != ";") {
                 if (options.semicolons || requireSemicolonChars(ch)) {
                     OUTPUT += ";";
                     current_col++;
@@ -258,7 +255,6 @@ function OutputStream(options) {
         }
 
         if (might_need_space) {
-            var prev = last_char();
             if ((is_identifier_char(prev)
                     && (is_identifier_char(ch) || ch == "\\"))
                 || (ch == "/" && ch == prev)
diff --git a/node_modules/uglify-js/lib/parse.js b/node_modules/uglify-js/lib/parse.js
index c34e13db6..014822ad9 100644
--- a/node_modules/uglify-js/lib/parse.js
+++ b/node_modules/uglify-js/lib/parse.js
@@ -111,7 +111,7 @@ var WHITESPACE_CHARS = makePredicate(characters(" \u00a0\n\r\t\f\u000b\u200b\u20
 
 var NEWLINE_CHARS = makePredicate(characters("\n\r\u2028\u2029"));
 
-var PUNC_BEFORE_EXPRESSION = makePredicate(characters("[{(,.;:"));
+var PUNC_BEFORE_EXPRESSION = makePredicate(characters("[{(,;:"));
 
 var PUNC_CHARS = makePredicate(characters("[]{}(),;:"));
 
@@ -285,7 +285,11 @@ function tokenizer($TEXT, filename, html5_comments, shebang) {
         S.regex_allowed = ((type == "operator" && !UNARY_POSTFIX(value)) ||
                            (type == "keyword" && KEYWORDS_BEFORE_EXPRESSION(value)) ||
                            (type == "punc" && PUNC_BEFORE_EXPRESSION(value)));
-        prev_was_dot = (type == "punc" && value == ".");
+        if (type == "punc" && value == ".") {
+            prev_was_dot = true;
+        } else if (!is_comment) {
+            prev_was_dot = false;
+        }
         var ret = {
             type    : type,
             value   : value,
@@ -803,28 +807,23 @@ function parse($TEXT, options) {
     };
 
     var statement = embed_tokens(function() {
-        var tmp;
         handle_regexp();
         switch (S.token.type) {
           case "string":
-            var dir = false;
-            if (S.in_directives === true) {
-                if ((is_token(peek(), "punc", ";") || peek().nlb) && S.token.raw.indexOf("\\") === -1) {
+            if (S.in_directives) {
+                var token = peek();
+                if (S.token.raw.indexOf("\\") == -1
+                    && (token.nlb
+                        || is_token(token, "eof")
+                        || is_token(token, "punc", ";")
+                        || is_token(token, "punc", "}"))) {
                     S.input.add_directive(S.token.value);
                 } else {
                     S.in_directives = false;
                 }
             }
             var dir = S.in_directives, stat = simple_statement();
-            if (dir) {
-                return new AST_Directive({
-                    start : stat.body.start,
-                    end   : stat.body.end,
-                    quote : stat.body.quote,
-                    value : stat.body.value,
-                });
-            }
-            return stat;
+            return dir ? new AST_Directive(stat.body) : stat;
           case "num":
           case "regexp":
           case "operator":
@@ -856,75 +855,103 @@ function parse($TEXT, options) {
             }
 
           case "keyword":
-            switch (tmp = S.token.value, next(), tmp) {
+            switch (S.token.value) {
               case "break":
+                next();
                 return break_cont(AST_Break);
 
               case "continue":
+                next();
                 return break_cont(AST_Continue);
 
               case "debugger":
+                next();
                 semicolon();
                 return new AST_Debugger();
 
               case "do":
+                next();
+                var body = in_loop(statement);
+                expect_token("keyword", "while");
+                var condition = parenthesised();
+                semicolon(true);
                 return new AST_Do({
-                    body      : in_loop(statement),
-                    condition : (expect_token("keyword", "while"), tmp = parenthesised(), semicolon(true), tmp)
+                    body      : body,
+                    condition : condition
                 });
 
               case "while":
+                next();
                 return new AST_While({
                     condition : parenthesised(),
                     body      : in_loop(statement)
                 });
 
               case "for":
+                next();
                 return for_();
 
               case "function":
+                next();
                 return function_(AST_Defun);
 
               case "if":
+                next();
                 return if_();
 
               case "return":
                 if (S.in_function == 0 && !options.bare_returns)
                     croak("'return' outside of function");
+                next();
+                var value = null;
+                if (is("punc", ";")) {
+                    next();
+                } else if (!can_insert_semicolon()) {
+                    value = expression(true);
+                    semicolon();
+                }
                 return new AST_Return({
-                    value: ( is("punc", ";")
-                             ? (next(), null)
-                             : can_insert_semicolon()
-                             ? null
-                             : (tmp = expression(true), semicolon(), tmp) )
+                    value: value
                 });
 
               case "switch":
+                next();
                 return new AST_Switch({
                     expression : parenthesised(),
                     body       : in_loop(switch_body_)
                 });
 
               case "throw":
+                next();
                 if (S.token.nlb)
                     croak("Illegal newline after 'throw'");
+                var value = expression(true);
+                semicolon();
                 return new AST_Throw({
-                    value: (tmp = expression(true), semicolon(), tmp)
+                    value: value
                 });
 
               case "try":
+                next();
                 return try_();
 
               case "var":
-                return tmp = var_(), semicolon(), tmp;
+                next();
+                var node = var_();
+                semicolon();
+                return node;
 
               case "const":
-                return tmp = const_(), semicolon(), tmp;
+                next();
+                var node = const_();
+                semicolon();
+                return node;
 
               case "with":
                 if (S.input.has_directive("use strict")) {
                     croak("Strict mode may not include a with statement");
                 }
+                next();
                 return new AST_With({
                     expression : parenthesised(),
                     body       : statement()
@@ -1320,10 +1347,15 @@ function parse($TEXT, options) {
             var type = start.type;
             var name = as_property_name();
             if (type == "name" && !is("punc", ":")) {
+                var key = new AST_SymbolAccessor({
+                    start: S.token,
+                    name: as_property_name(),
+                    end: prev()
+                });
                 if (name == "get") {
                     a.push(new AST_ObjectGetter({
                         start : start,
-                        key   : as_atom_node(),
+                        key   : key,
                         value : create_accessor(),
                         end   : prev()
                     }));
@@ -1332,7 +1364,7 @@ function parse($TEXT, options) {
                 if (name == "set") {
                     a.push(new AST_ObjectSetter({
                         start : start,
-                        key   : as_atom_node(),
+                        key   : key,
                         value : create_accessor(),
                         end   : prev()
                     }));
@@ -1354,14 +1386,15 @@ function parse($TEXT, options) {
 
     function as_property_name() {
         var tmp = S.token;
-        next();
         switch (tmp.type) {
+          case "operator":
+            if (!KEYWORDS(tmp.value)) unexpected();
           case "num":
           case "string":
           case "name":
-          case "operator":
           case "keyword":
           case "atom":
+            next();
             return tmp.value;
           default:
             unexpected();
@@ -1370,16 +1403,9 @@ function parse($TEXT, options) {
 
     function as_name() {
         var tmp = S.token;
+        if (tmp.type != "name") unexpected();
         next();
-        switch (tmp.type) {
-          case "name":
-          case "operator":
-          case "keyword":
-          case "atom":
-            return tmp.value;
-          default:
-            unexpected();
-        }
+        return tmp.value;
     };
 
     function _make_symbol(type) {
@@ -1440,14 +1466,14 @@ function parse($TEXT, options) {
         if (is("operator") && UNARY_PREFIX(start.value)) {
             next();
             handle_regexp();
-            var ex = make_unary(AST_UnaryPrefix, start.value, maybe_unary(allow_calls));
+            var ex = make_unary(AST_UnaryPrefix, start, maybe_unary(allow_calls));
             ex.start = start;
             ex.end = prev();
             return ex;
         }
         var val = expr_atom(allow_calls);
         while (is("operator") && UNARY_POSTFIX(S.token.value) && !S.token.nlb) {
-            val = make_unary(AST_UnaryPostfix, S.token.value, val);
+            val = make_unary(AST_UnaryPostfix, S.token, val);
             val.start = start;
             val.end = S.token;
             next();
@@ -1455,9 +1481,10 @@ function parse($TEXT, options) {
         return val;
     };
 
-    function make_unary(ctor, op, expr) {
+    function make_unary(ctor, token, expr) {
+        var op = token.value;
         if ((op == "++" || op == "--") && !is_assignable(expr))
-            croak("Invalid use of " + op + " operator", null, ctor === AST_UnaryPrefix ? expr.start.col - 1 : null);
+            croak("Invalid use of " + op + " operator", token.line, token.col, token.pos);
         return new ctor({ operator: op, expression: expr });
     };
 
diff --git a/node_modules/uglify-js/lib/scope.js b/node_modules/uglify-js/lib/scope.js
index 74760e4f4..bf6dbcbbf 100644
--- a/node_modules/uglify-js/lib/scope.js
+++ b/node_modules/uglify-js/lib/scope.js
@@ -361,11 +361,6 @@ AST_Symbol.DEFMETHOD("unmangleable", function(options){
     return this.definition().unmangleable(options);
 });
 
-// property accessors are not mangleable
-AST_SymbolAccessor.DEFMETHOD("unmangleable", function(){
-    return true;
-});
-
 // labels are always mangleable
 AST_Label.DEFMETHOD("unmangleable", function(){
     return false;
diff --git a/node_modules/uglify-js/package.json b/node_modules/uglify-js/package.json
index cfa8eb742..a06c051f3 100644
--- a/node_modules/uglify-js/package.json
+++ b/node_modules/uglify-js/package.json
@@ -4,7 +4,7 @@
   "homepage": "http://lisperator.net/uglifyjs",
   "author": "Mihai Bazon <mihai.bazon@gmail.com> (http://lisperator.net/)",
   "license": "BSD-2-Clause",
-  "version": "2.8.22",
+  "version": "2.8.27",
   "engines": {
     "node": ">=0.8.0"
   },
@@ -33,10 +33,7 @@
     "yargs": "~3.10.0"
   },
   "devDependencies": {
-    "acorn": "~0.6.0",
-    "escodegen": "~1.3.3",
-    "esfuzz": "~0.3.1",
-    "estraverse": "~1.5.1",
+    "acorn": "~5.0.3",
     "mocha": "~2.3.4"
   },
   "optionalDependencies": {