In addition to the standard JavaScript set of functions (such as String, Array, Object, JSON, etc.), there are a variety of functions available from the DOM to workers. This article provides a list of those.
In addition to the standard JavaScript set of functions (such as String, Array, Object, JSON, etc.), there are a variety of functions available from the DOM to workers. This article provides a list of those.
Workers run in a different global context than the current window! While Window is not directly available to workers, many of the same methods are defined in a shared mixin (WindowOrWorkerGlobalScope), and made available to workers through their own WorkerGlobalScope-derived contexts:
DedicatedWorkerGlobalScope for dedicated workersSharedWorkerGlobalScope for shared workersServiceWorkerGlobalScope for service workers
Some of the functions (a subset) that are common to all workers and to the main thread (from WindowOrWorkerGlobalScope) are:
atob()btoa()clearInterval()clearTimeout()dump() Non-standard
queueMicrotask()setInterval()setTimeout()structuredClone()window.requestAnimationFrame (dedicated workers only)window.cancelAnimationFrame (dedicated workers only)The following functions are only available to workers:
WorkerGlobalScope.importScripts() (all workers)DedicatedWorkerGlobalScope.postMessage (dedicated workers only)Note: If a listed API is supported by a platform in a particular version, then it can generally be assumed to be available in web workers. You can also test support for a particular object/function using the site: https://worker-playground.glitch.me/
The following Web APIs are available to workers:
Barcode Detection APIBroadcast Channel APICache APIChannel Messaging APIConsole APICrypto)CustomEventEncoding API (e.g. TextEncoder, TextDecoder)Fetch APIFileReaderFileReaderSync (only works in workers!)FormDataImageBitmapImageDataIndexedDBNotifications APIOffscreenCanvas (and all the canvas context APIs)Performance API, including: ServiceWorkerRegistrationURL API (e.g. URL)WebSocketXMLHttpRequestWorkers can also spawn other workers, so these APIs are also available:
© 2005–2023 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/Web_Workers_API/Functions_and_classes_available_to_workers