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