time-to-botec

Benchmark sampling in different programming languages
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main.js (2287B)

      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 /* global WorkerGlobalScope, WorkerNavigator, WorkerLocation, self, importScripts, navigator, location */
     20 
     21 'use strict';
     22 
     23 // MODULES //
     24 
     25 var getGlobal = require( '@stdlib/utils/global' );
     26 var IS_NODE = require( './../../is-node' );
     27 var isObject = require( './../../is-plain-object' );
     28 var globalScope = require( './global_scope.js' );
     29 
     30 
     31 // VARIABLES //
     32 
     33 var Global = getGlobal();
     34 
     35 
     36 // MAIN //
     37 
     38 /**
     39 * Returns a boolean indicating if the runtime is a web worker.
     40 *
     41 * @returns {boolean} boolean indicating if runtime is a web worker
     42 *
     43 * @example
     44 * var bool = isWebWorker();
     45 * // returns <boolean>
     46 */
     47 function isWebWorker() {
     48 	return (
     49 		// Check that we are not running in a Node.js runtime:
     50 		IS_NODE === false &&
     51 
     52 		// Check for presence of `WorkerGlobalScope` global variable:
     53 		typeof WorkerGlobalScope === 'object' &&
     54 
     55 		// Check for presence of `WorkerNavigator` global variable:
     56 		isObject( WorkerNavigator ) &&
     57 
     58 		// Check that the `navigator` global object is an instance of `WorkerNavigator`:
     59 		navigator instanceof WorkerNavigator &&
     60 
     61 		// Check for presence of `WorkerLocation` global variable:
     62 		isObject( WorkerLocation ) &&
     63 
     64 		// Check that the `location` global object is an instance of `WorkerLocation`:
     65 		location instanceof WorkerLocation &&
     66 
     67 		// Check for presence of `self` variable:
     68 		typeof self === 'object' &&
     69 
     70 		// Check that the `self` variable matches the determined global variable:
     71 		self === Global &&
     72 
     73 		// Check that the `self` variable is equal to the global scope:
     74 		globalScope === true &&
     75 
     76 		// Check for presence of `importScripts` function:
     77 		typeof importScripts === 'function'
     78 	);
     79 }
     80 
     81 
     82 // EXPORTS //
     83 
     84 module.exports = isWebWorker;