main.js (1316B)
1 /** 2 * @license Apache-2.0 3 * 4 * Copyright (c) 2018 The Stdlib Authors. 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 /* eslint-disable stdlib/require-globals */ 20 21 'use strict'; 22 23 // MODULES // 24 25 var hasOwnProp = require( './../../has-own-property' ); 26 27 28 // MAIN // 29 30 /** 31 * Tests for native `Symbol.asyncIterator` support. 32 * 33 * @returns {boolean} boolean indicating if an environment has `Symbol.asyncIterator` support 34 * 35 * @example 36 * var bool = hasAsyncIteratorSymbolSupport(); 37 * // returns <boolean> 38 */ 39 function hasAsyncIteratorSymbolSupport() { // eslint-disable-line id-length 40 return ( 41 typeof Symbol === 'function' && 42 typeof Symbol( 'foo' ) === 'symbol' && 43 hasOwnProp( Symbol, 'asyncIterator' ) && 44 typeof Symbol.asyncIterator === 'symbol' 45 ); 46 } 47 48 49 // EXPORTS // 50 51 module.exports = hasAsyncIteratorSymbolSupport;