global_scope.js (1329B)
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 'use strict'; 20 21 // VARIABLES // 22 23 var Global; 24 25 26 // FUNCTIONS // 27 28 /** 29 * Test if the global scope is bound to the "global" variable present in Node.js environments. When creating a new function using the `Function(){}` constructor, the execution scope aliased by the `this` variable is the global scope. 30 * 31 * @private 32 * @returns {boolean} boolean indicating if global scope is bound to "global" variable 33 */ 34 function globalScope() { 35 var fcn = ''; 36 fcn += 'try {'; 37 fcn += 'return this === global;'; 38 fcn += '} catch ( err ) {'; 39 fcn += 'return false;'; 40 fcn += '}'; 41 return (new Function( fcn ))(); // eslint-disable-line no-new-func 42 } 43 44 45 // MAIN // 46 47 Global = globalScope(); 48 49 50 // EXPORTS // 51 52 module.exports = Global;