🏠 New in Low Baseline Support: JavaScript modules in service workers

January 13, 2026

caniuse · mdn · spec

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.

Source features

• api.ServiceWorker.ecmascript_modules [mdn]
• javascript.statements.import.service_worker_support [mdn]