topic Re: Support import statements in Service Workers in Discussions

Support import statements in Service Workers

dazy — Tue, 11 Feb 2025 18:37:52 GMT

Most major browsers support the use of ECMAScript import statements in the Service Worker by declaring { type: 'module' } when registering the Service Worker script.

This:

// in main script navigator.serviceWorker.register("service-worker.js", { type: "module", })

Enables:

// in service-worker.js import "path/to/this.js" import { that } from 'path/to/that.js' import * as theOtherThing from 'path/to/theOtherThing.js' // ...

Unfortunately Firefox does not support this functionality for Service Workers. This was disappointing because I had intended to package my Service Worker code for a notification-based library as ECMA modules.

A similar feature was implemented for Web Workers two years ago.

Is FF actively working on this functionality for Service Workers?

Re: Support import statements in Service Workers

stacyjasper — Fri, 21 Mar 2025 17:15:19 GMT

Firefox's lack of support for ECMAScript import statements in Service Workers is indeed frustrating, especially since other major browsers have implemented this functionality. Given that Web Workers gained module support two years ago, it's surprising that Service Workers are still left behind. This limitation makes it difficult to maintain clean, modular code, particularly for use cases like notification-based libraries. Firefox should prioritize adding this feature to stay aligned with modern web development practices. If you're developing with Service www.alexandrialimos.com Workers, consider testing in Chromium-based browsers or checking Mozilla's roadmap for updates.

Thanks!

Re: Support import statements in Service Workers

stacyjasper — Mon, 14 Apr 2025 10:26:26 GMT

You can use ECMAScript import statements in Service. This allows you to organize your Service Worker code with clean, modular imports. However, Firefox still does not support this feature for Service Workers, which can be limiting if you plan to build complex applications like notification libraries. While Firefox implemented module support for Web Workers some time Digital Crew IT ago, it is unclear how actively they are working on bringing this to Service Workers.

Re: Support import statements in Service Workers

halexalexe — Tue, 20 May 2025 12:23:12 GMT

Thanks for the heads-up, Stacy. That’s definitely something to keep in mind, especially for those of us building more dynamic features into web apps. I'm currently working on a PWA for a san diego car service and modular Service Worker support would make organizing notification logic a lot easier. Hopefully, Firefox adds full support soon it’d really help streamline development across all browsers.

Re: Support import statements in Service Workers

dasch — Sun, 22 Jun 2025 10:58:56 GMT

Thanks — you helped me save time locating the error! The error message:

Uncaught (in promise) TypeError: ServiceWorker script at .../sw.js for scope .../ threw an exception during script evaluation.

isn't very helpful.

To see the progress of the development, visit Bugzilla. You can also vote for this bug in the 'Details' section.

Re: Support import statements in Service Workers

markgdrt — Wed, 06 Aug 2025 20:50:43 GMT

Yeah, it’s definitely frustrating that Firefox still doesn’t support ES module imports in Service Workers — it really limits clean code organization for modern JS apps. Hopefully they catch up soon, especially since Web Workers already support it.

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Re: Support import statements in Service Workers

JohnRoy — Sat, 07 Mar 2026 14:48:37 GMT

Great question. The ability to use ES modules inside Service Workers would definitely make project structure cleaner and easier to maintain, especially for larger applications that rely on modular code. Hopefully Firefox adds this support soon since most modern workflows already rely heavily on ES module architecture.

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Re: Support import statements in Service Workers

Jonyroy — Wed, 15 Apr 2026 11:08:44 GMT

Interesting breakdown of ES module support in Service Workers—this limitation in Firefox definitely complicates modern modular architectures, especially for scalable notification or caching systems. Until full support is standardized across browsers, developers have to rely on bundlers or fallback patterns, which adds extra overhead to otherwise clean module-based designs.

From a broader perspective, this kind of compatibility gap also mirrors challenges seen in frontend-driven platforms like smart home dashboards or automation panels, where modular scripts play a key role in performance and maintainability. I recently came across a well-structured approach to organizing such systems in this guide:
garden-guide-homenumental it highlights how modular thinking can be applied even beyond traditional web apps.

Re: Support import statements in Service Workers

Medraso1225 — Tue, 21 Apr 2026 04:36:33 GMT

This is a really important limitation to point out, especially for developers working with modern JavaScript architecture. Service Workers are already central to offline support, caching, and background processing, so lacking proper ECMAScript module import support in Firefox creates real friction in code structure and maintainability. It also forces developers to rely on less clean workarounds, which reduces consistency across different browsers.

In practical systems like Crew Logout, where session handling, authentication states, and background sync are constantly managed in the background, modular Service Worker support would make the architecture much cleaner. This becomes especially important for systems like a digital timesheet website for shift workers , where shift data, attendance logs, and updates need to stay accurate and synchronized even when users are switching tabs, going offline, or returning after time gaps.