main.js (1367B)
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 // MODULES // 22 23 var evil = require( '@stdlib/utils/eval' ); 24 25 26 // MAIN // 27 28 /** 29 * Tests for native `Proxy` support. 30 * 31 * @returns {boolean} boolean indicating if an environment has native `Proxy` support 32 * 33 * @example 34 * var bool = hasProxySupport(); 35 * // returns <boolean> 36 */ 37 function hasProxySupport() { 38 var bool; 39 try { 40 evil( '"use strict"; var handler = { "get": function get( t, n ) { return t[ n ] * 100; } }; var target = { "beep": 3.14 }; var p = new Proxy( target, handler ); var x = p.beep; if ( x !== 314 ) { throw new Error( "native Proxy is not supported." ); }' ); 41 bool = true; 42 } catch ( err ) { // eslint-disable-line no-unused-vars 43 bool = false; 44 } 45 return bool; 46 } 47 48 49 // EXPORTS // 50 51 module.exports = hasProxySupport;