JavaScript modules in shared workers

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

Baseline Status: Achieved Newly Available on May 5, 2026 across core engines.

Desktop Browser Engine Support

Google Chrome

80

Supported

Mozilla Firefox

114

Supported

Apple Safari

16

Supported

Microsoft Edge

80

Supported

Mobile Browser Engine Support

Chrome Android

148

Firefox Android

114

Safari iOS

16

Specifications and References

Specification ↗ Feature XML ↗

MDN Browser Compat Data Keys:

api.SharedWorker.SharedWorker.ecmascript_modules ↗ api.SharedWorker.SharedWorker.options_type_parameter ↗