global_scope.js (1330B)
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 no-new-func */ 20 21 'use strict'; 22 23 // VARIABLES // 24 25 var scope; 26 27 28 // FUNCTIONS // 29 30 /** 31 * Test if the global scope is bound to the "self" variable present in browser web worker environments. When creating a new function using the `Function(){}` constructor, the execution scope aliased by the `this` variable is the global scope. 32 * 33 * @private 34 * @returns {boolean} boolean indicating if global scope is bound to "self" variable 35 */ 36 function globalScope() { 37 var fcn = ''; 38 fcn += 'try {'; 39 fcn += 'return this === self;'; 40 fcn += '} catch ( err ) {'; 41 fcn += 'return false;'; 42 fcn += '}'; 43 return (new Function( fcn ))(); 44 } 45 46 47 // MAIN // 48 49 scope = globalScope(); 50 51 52 // EXPORTS // 53 54 module.exports = scope;