1 files changed, 16 insertions, 14 deletions

diff --git a/node_modules/es6-iterator/string.js b/node_modules/es6-iterator/string.js
index cdb39ea4e..48882252b 100644
--- a/node_modules/es6-iterator/string.js
+++ b/node_modules/es6-iterator/string.js
@@ -1,37 +1,39 @@
 // Thanks @mathiasbynens
 // http://mathiasbynens.be/notes/javascript-unicode#iterating-over-symbols
 
-'use strict';
+"use strict";
 
-var setPrototypeOf = require('es5-ext/object/set-prototype-of')
-  , d              = require('d')
-  , Iterator       = require('./')
+var setPrototypeOf = require("es5-ext/object/set-prototype-of")
+  , d              = require("d")
+  , Symbol         = require("es6-symbol")
+  , Iterator       = require("./");
 
-  , defineProperty = Object.defineProperty
-  , StringIterator;
+var defineProperty = Object.defineProperty, StringIterator;
 
 StringIterator = module.exports = function (str) {
-	if (!(this instanceof StringIterator)) return new StringIterator(str);
+	if (!(this instanceof StringIterator)) throw new TypeError("Constructor requires 'new'");
 	str = String(str);
 	Iterator.call(this, str);
-	defineProperty(this, '__length__', d('', str.length));
-
+	defineProperty(this, "__length__", d("", str.length));
 };
 if (setPrototypeOf) setPrototypeOf(StringIterator, Iterator);
 
+// Internal %ArrayIteratorPrototype% doesn't expose its constructor
+delete StringIterator.prototype.constructor;
+
 StringIterator.prototype = Object.create(Iterator.prototype, {
-	constructor: d(StringIterator),
 	_next: d(function () {
-		if (!this.__list__) return;
+		if (!this.__list__) return undefined;
 		if (this.__nextIndex__ < this.__length__) return this.__nextIndex__++;
 		this._unBind();
+		return undefined;
 	}),
 	_resolve: d(function (i) {
 		var char = this.__list__[i], code;
 		if (this.__nextIndex__ === this.__length__) return char;
 		code = char.charCodeAt(0);
-		if ((code >= 0xD800) && (code <= 0xDBFF)) return char + this.__list__[this.__nextIndex__++];
+		if (code >= 0xd800 && code <= 0xdbff) return char + this.__list__[this.__nextIndex__++];
 		return char;
-	}),
-	toString: d(function () { return '[object String Iterator]'; })
+	})
 });
+defineProperty(StringIterator.prototype, Symbol.toStringTag, d("c", "String Iterator"));