JavaScript will support modules in service workers. Setting 'module' type by the constructor's type attribute, worker scripts are loaded as ES modules and the import statement is available on worker contexts.


With this feature, web developers can more easily write programs in a composable way and share them among a page and workers.


Editor's draft

Status in Chromium


Enabled by default (tracking bug) in:

  • Chrome for desktop release 91
  • Chrome for Android release 91
  • Android WebView release 91

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.


Last updated on 2021-07-17