app/frontend/node_modules/es6-symbol/lib/private/generate-name.js

"use strict";

var d = require("d");

var create = Object.create, defineProperty = Object.defineProperty, objPrototype = Object.prototype;

var created = create(null);
module.exports = function (desc) {
	var postfix = 0, name, ie11BugWorkaround;
	while (created[desc + (postfix || "")]) ++postfix;
	desc += postfix || "";
	created[desc] = true;
	name = "@@" + desc;
	defineProperty(
		objPrototype,
		name,
		d.gs(null, function (value) {
			// For IE11 issue see:
			// https://connect.microsoft.com/IE/feedbackdetail/view/1928508/
			//    ie11-broken-getters-on-dom-objects
			// https://github.com/medikoo/es6-symbol/issues/12
			if (ie11BugWorkaround) return;
			ie11BugWorkaround = true;
			defineProperty(this, name, d(value));
			ie11BugWorkaround = false;
		})
	);
	return name;
};