text: 'use strict';
  
  var keys = require('object-keys');
  
  module.exports = function hasSymbols() {
  	if (typeof Symbol !== 'function' || typeof Object.getOwnPropertySymbols !== 'function') { return false; }
  	if (typeof Symbol.iterator === 'symbol') { return true; }
  
  	var obj = {};
  	var sym = Symbol('test');
  	var symObj = Object(sym);
  	if (typeof sym === 'string') { return false; }
  
  	if (Object.prototype.toString.call(sym) !== '[object Symbol]') { return false; }
  	if (Object.prototype.toString.call(symObj) !== '[object Symbol]') { return false; }
  
  	// temp disabled per https://github.com/ljharb/object.assign/issues/17
  	// if (sym instanceof Symbol) { return false; }
  	// temp disabled per https://github.com/WebReflection/get-own-property-symbols/issues/4
  	// if (!(symObj instanceof Symbol)) { return false; }
  
  	var symVal = 42;
  	obj[sym] = symVal;
  	for (sym in obj) { return false; }
  	if (keys(obj).length !== 0) { return false; }
  	if (typeof Object.keys === 'function' && Object.keys(obj).length !== 0) { return false; }
  
  	if (typeof Object.getOwnPropertyNames === 'function' && Object.getOwnPropertyNames(obj).length !== 0) { return false; }
  
  	var syms = Object.getOwnPropertySymbols(obj);
  	if (syms.length !== 1 || syms[0] !== sym) { return false; }
  
  	if (!Object.prototype.propertyIsEnumerable.call(obj, sym)) { return false; }
  
  	if (typeof Object.getOwnPropertyDescriptor === 'function') {
  		var descriptor = Object.getOwnPropertyDescriptor(obj, sym);
  		if (descriptor.value !== symVal || descriptor.enumerable !== true) { return false; }
  	}
  
  	return true;
  };
  