WorkerGlobalScope: importScripts() method

Note: This feature is only available in Web Workers.

The importScripts() method of the WorkerGlobalScope interface synchronously imports one or more scripts into the worker's scope.

Syntax

js
importScripts(path0)
importScripts(path0, path1)
importScripts(path0, path1, /* …, */ pathN)

Parameters

pathN

A string value representing the URL of the script to be imported. The URL may be absolute or relative. If the URL is relative, it is relative to the worker entry script's URL.

Return value

None (undefined).

Exceptions

NetworkError

Imported scripts were served without a text/javascript MIME type or without one of the permitted legacy JavaScript MIME types.

TypeError

Thrown if the current WorkerGlobalScope is a module. Use import instead.

Examples

If you had some functionality written in a separate script called foo.js that you wanted to use inside worker.js, you could import it using the following line:

js
importScripts("foo.js");

foo.js should be in the same URL subtree as the worker's entry point — for example, if this worker was created with new Worker("worker.js"), then worker.js is the entry point. If worker.js is at https://example.com/scripts/worker.js, then foo.js should be at https://example.com/scripts/foo.js.

importScripts() and self.importScripts() are effectively equivalent — both represent importScripts() being called from inside the worker's inner scope.

Specifications

Specification
HTML
# dom-workerglobalscope-importscripts-dev

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
importScripts
Strict MIME type checks for importScripts()

Legend

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Full support
Full support
No support
No support

See also