basant307/AI_Governance_Project

1'use strict';2 3var keys = require('object-keys');4 5module.exports = function hasSymbols() {6	if (typeof Symbol !== 'function' || typeof Object.getOwnPropertySymbols !== 'function') { return false; }7	if (typeof Symbol.iterator === 'symbol') { return true; }8 9	var obj = {};10	var sym = Symbol('test');11	var symObj = Object(sym);12	if (typeof sym === 'string') { return false; }13 14	if (Object.prototype.toString.call(sym) !== '[object Symbol]') { return false; }15	if (Object.prototype.toString.call(symObj) !== '[object Symbol]') { return false; }16 17	/*18	 * temp disabled per https://github.com/ljharb/object.assign/issues/1719	 * if (sym instanceof Symbol) { return false; }20	 * temp disabled per https://github.com/WebReflection/get-own-property-symbols/issues/421	 * if (!(symObj instanceof Symbol)) { return false; }22	 */23 24	var symVal = 42;25	obj[sym] = symVal;26	for (sym in obj) { return false; } // eslint-disable-line no-unreachable-loop27	if (keys(obj).length !== 0) { return false; }28	if (typeof Object.keys === 'function' && Object.keys(obj).length !== 0) { return false; }29 30	if (typeof Object.getOwnPropertyNames === 'function' && Object.getOwnPropertyNames(obj).length !== 0) { return false; }31 32	var syms = Object.getOwnPropertySymbols(obj);33	if (syms.length !== 1 || syms[0] !== sym) { return false; }34 35	if (!Object.prototype.propertyIsEnumerable.call(obj, sym)) { return false; }36 37	if (typeof Object.getOwnPropertyDescriptor === 'function') {38		var descriptor = Object.getOwnPropertyDescriptor(obj, sym);39		if (descriptor.value !== symVal || descriptor.enumerable !== true) { return false; }40	}41 42	return true;43};44