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JavaScript modules in workers

Widely Available (since 2025-12-06)

The Worker() constructor accepts { type: "module" } to load scripts that use import and export. Also known as ECMAScript modules or ESM in workers.

Browser support

  • Chrome 80 Released on 2020-02-04
  • Chrome Android 80 Released on 2020-02-04
  • Edge 80 Released on 2020-02-07
  • Firefox 114 Released on 2023-06-06
  • Firefox for Android 114 Released on 2023-06-06
  • Safari 15 Released on 2021-09-20
  • Safari on iOS 15 Released on 2021-09-20

MDN documentation

Specifications

Usage (according to Chrome Platform Status)

~0.823% of page loads. More data at chromestatus.com.

Web Platform Tests (WPT)

View the latest WPT test results for this feature

Interop

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