Web Workers – How To Import Modules

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ES2015 modules in Workers are available in Safari and in Chromium browsers.

If other browsers / versions are your target, you still need to use importScripts().

When available, you create a module-worker like this:

new Worker("worker.js", { type: "module" });

See: https://html.spec.whatwg.org/#module-worker-example

These are the bug-reports for each browser:

  • Firefox: In development (almost done) 🛑 please vote!
  • Chromium Browsers:
    Dedicated Workers: Available since version 80 ✔️
    Shared Workers: Available since version 83 ✔️
    Service Workers: Available since version 91 ✔️
  • Webkit:
    Safari Desktop: Available since Safari 14.1 ✔️
    Safari Mobile (iOS): Available since Safari 15 ✔️

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