JavaScript modules in service workers

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

Browser support

• Chrome 91 Released on 2021-05-25
• Chrome Android 91 Released on 2021-05-25
• Edge 91 Released on 2021-05-27
• Firefox ❌ See bugzil.la/1360870
• Firefox for Android ❌ See bugzil.la/1360870
• Safari 15 Released on 2021-09-20
• Safari on iOS 15 Released on 2021-09-20

Baseline availability blocked since September 2021 by Firefox (39 months)

Edit this feature - Report an issue about this feature