85 lines
2.2 KiB
JavaScript
85 lines
2.2 KiB
JavaScript
/**
|
|
* @license Apache-2.0
|
|
*
|
|
* Copyright (c) 2018 The Stdlib Authors.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
|
|
/* global WorkerGlobalScope, WorkerNavigator, WorkerLocation, self, importScripts, navigator, location */
|
|
|
|
'use strict';
|
|
|
|
// MODULES //
|
|
|
|
var getGlobal = require( '@stdlib/utils/global' );
|
|
var IS_NODE = require( './../../is-node' );
|
|
var isObject = require( './../../is-plain-object' );
|
|
var globalScope = require( './global_scope.js' );
|
|
|
|
|
|
// VARIABLES //
|
|
|
|
var Global = getGlobal();
|
|
|
|
|
|
// MAIN //
|
|
|
|
/**
|
|
* Returns a boolean indicating if the runtime is a web worker.
|
|
*
|
|
* @returns {boolean} boolean indicating if runtime is a web worker
|
|
*
|
|
* @example
|
|
* var bool = isWebWorker();
|
|
* // returns <boolean>
|
|
*/
|
|
function isWebWorker() {
|
|
return (
|
|
// Check that we are not running in a Node.js runtime:
|
|
IS_NODE === false &&
|
|
|
|
// Check for presence of `WorkerGlobalScope` global variable:
|
|
typeof WorkerGlobalScope === 'object' &&
|
|
|
|
// Check for presence of `WorkerNavigator` global variable:
|
|
isObject( WorkerNavigator ) &&
|
|
|
|
// Check that the `navigator` global object is an instance of `WorkerNavigator`:
|
|
navigator instanceof WorkerNavigator &&
|
|
|
|
// Check for presence of `WorkerLocation` global variable:
|
|
isObject( WorkerLocation ) &&
|
|
|
|
// Check that the `location` global object is an instance of `WorkerLocation`:
|
|
location instanceof WorkerLocation &&
|
|
|
|
// Check for presence of `self` variable:
|
|
typeof self === 'object' &&
|
|
|
|
// Check that the `self` variable matches the determined global variable:
|
|
self === Global &&
|
|
|
|
// Check that the `self` variable is equal to the global scope:
|
|
globalScope === true &&
|
|
|
|
// Check for presence of `importScripts` function:
|
|
typeof importScripts === 'function'
|
|
);
|
|
}
|
|
|
|
|
|
// EXPORTS //
|
|
|
|
module.exports = isWebWorker;
|