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JavaScript modules in shared workers

Newly Available (since 2026-05-05)
Expected to be Widely Available on 2028-11-05

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

Browser support

  • Chrome 80 Released on 2020-02-04
  • Chrome Android 148 Released on 2026-05-05
  • Edge 80 Released on 2020-02-07
  • Firefox 114 Released on 2023-06-06
  • Firefox for Android 114 Released on 2023-06-06
  • Safari 16 Released on 2022-09-12
  • Safari on iOS 16 Released on 2022-09-12

MDN documentation

Specifications

Usage (according to Chrome Platform Status)

~0.596% of page loads. More data at chromestatus.com.

Web Platform Tests (WPT)

View the latest WPT test results for this feature

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