can-globals/is-web-worker/is-web-worker.js

This module provides a dependency injection container. Modules may define a key and specify a default value (which can be static, cached lazy, or dynamic lazy), but other code can set and reset the value as needed. There is also an event system, for alert

'use strict';

var globals = require('can-globals/can-globals-instance');

/* globals WorkerGlobalScope */
// A bit of weirdness to avoid complaining linters
var funcConstructor = Function;


/**
 * @module {function} can-globals/is-browser-window/is-web-worker is-web-worker
 * @parent can-globals/modules
 * @signature `isWebWorker()`
 *
 * Returns `true` if the code is running within a [web worker](https://developer.mozilla.org/en-US/docs/Web/API/Worker).
 *
 * ```js
 * var isWebWorker = require("can-globals/is-web-worker/is-web-worker");
 * var GLOBAL = require("can-globals/global/global");
 *
 * if(isWebWorker()) {
 *   ...
 * }
 * ```
 *
 * @return {Boolean} True if the environment is a web worker.
 */

globals.define('isWebWorker', function(){
    var global = funcConstructor('return this')();
    return typeof WorkerGlobalScope !== "undefined" &&
        (global instanceof WorkerGlobalScope);
});

module.exports = globals.makeExport('isWebWorker');