Any standard mechanism for detecting if a JavaScript is executing as a WebWorker?

Question

A WebWorker executes with a scope completely separate from the \'window\' context of traditional JavaScript. Is there a standard way for a script to determine if it is, its

Answer 1

Although post a bit old, adding a couple of generic alternatives What is used in Asynchronous.js library (a library for generic handling of asynchronous/parallel processes, author) is the following:

// other declarations here
,isNode = ("undefined" !== typeof global) && ('[object global]' === Object.prototype.toString.call(global))
// http://nodejs.org/docs/latest/api/all.html#all_cluster
,isNodeProcess = isNode && !!process.env.NODE_UNIQUE_ID
,isWebWorker = !isNode && ('undefined' !== typeof WorkerGlobalScope) && ("function" === typeof importScripts) && (navigator instanceof WorkerNavigator)
,isBrowser = !isNode && !isWebWorker && ("undefined" !== typeof navigator) && ("undefined" !== typeof document)
,isBrowserWindow = isBrowser && !!window.opener
,isAMD = "function" === typeof( define ) && define.amd
,supportsMultiThread = isNode || "function" === typeof Worker
,isThread = isNodeProcess || isWebWorker
// rest declarations here..