has-symbols/index.js

Determine if the JS environment has Symbol support. Supports spec, or shams.

'use strict';

var origSymbol = typeof Symbol !== 'undefined' && Symbol;
var hasSymbolSham = require('./shams');

/** @type {import('.')} */
module.exports = function hasNativeSymbols() {
	if (typeof origSymbol !== 'function') { return false; }
	if (typeof Symbol !== 'function') { return false; }
	if (typeof origSymbol('foo') !== 'symbol') { return false; }
	if (typeof Symbol('bar') !== 'symbol') { return false; }

	return hasSymbolSham();
};