Функции и классы доступные веб-воркерам

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 (en-US) for dedicated workers
• SharedWorkerGlobalScope (en-US) for shared workers
• ServiceWorkerGlobalScope (en-US) for service workers

Some of the functions that are common to all workers and to the main thread (from WindowOrWorkerGlobalScope) are: atob(), btoa(), clearInterval() (en-US), clearTimeout(), dump() (en-US) Non-standard , setInterval(), setTimeout().

The following functions are only available to workers:

• WorkerGlobalScope.importScripts() (all workers),
• DedicatedWorkerGlobalScope.postMessage (en-US) (dedicated workers only).

Note: If a listed API is supported by a platform in a particular version, then it can generally be assumed to work in web workers.

The following Web APIs are available to workers:

• Broadcast Channel API (en-US)
• Cache API
• Channel Messaging API (en-US)
• Console API
• Crypto
• CustomEvent (en-US), DOMRequest and DOMCursor
• Fetch
• FileReader
• FileReaderSync (en-US) (only works in workers!)
• FormData
• ImageData
• IndexedDB
• Network Information API
• Notifications
• Performance
• PerformanceEntry (en-US)
• PerformanceMeasure (en-US)
• PerformanceMark (en-US)
• PerformanceObserver (en-US)
• PerformanceResourceTiming (en-US)
• Promise
• Server-sent events
• ServiceWorkerRegistration
• TextEncoder (en-US) and TextDecoder (en-US)
• URL
• WebGL with OffscreenCanvas (en-US)
• WebSocket
• XMLHttpRequest (although the responseXML and channel attributes are always null).

Workers can also spawn other workers, so these APIs are also available:

• Worker
• WorkerGlobalScope
• WorkerLocation (en-US)
• WorkerNavigator (en-US).

• Using web workers
• Worker