FF114 ECMAScript module support

[hamishwillee]

FF114 adds support for ECMAScript modules. What that means is that you can use the constructor {type: "module"} in worker/shared worker constructor, and use both import and import(). In Worklets you can call import.
FF does not yet support modules in ServiceWorkers, but they also allow import only.

What this does is update experimental features and FF114 release notes with the additions. It also adds notes to Worklet and ServiceWorker to make it clear that workers can only load modules using import, since that is a spec rather than a compatibility thing.

Other docs work can be tracked in #26695

[github-actions]

Preview URLs

• /en-US/docs/Mozilla/Firefox/Experimental_features
• /en-US/docs/Mozilla/Firefox/Releases/114
• /en-US/docs/Web/API/ServiceWorker
• /en-US/docs/Web/API/Worklet

Flaws (4)

Note! 2 documents with no flaws that don't need to be listed. 🎉

URL: /en-US/docs/Mozilla/Firefox/Experimental_features
Title: Experimental features in Firefox
Flaw count: 1

• broken_links:
  • Can't resolve /en-US/docs/Web/API/WebTransportReceiveStream

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URL: /en-US/docs/Web/API/Worklet
Title: Worklet
Flaw count: 3

• macros:
  • /en-US/docs/Web/API/AnimationWorklet does not exist
  • /en-US/docs/Web/API/LayoutWorklet does not exist
  • /en-US/docs/Web/API/CSS/paintWorklet redirects to /en-US/docs/Web/API/CSS/paintWorklet_static

External URLs (69)

URL: /en-US/docs/Mozilla/Firefox/Experimental_features
Title: Experimental features in Firefox

• https://bugzil.la/1057233 (1 time)
• https://bugzil.la/1099557 (1 time)
• https://bugzil.la/1178765 (1 time)
• https://bugzil.la/1190623 (1 time)
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• https://docs.microsoft.com/en-us/typography/opentype/spec/ (1 time)
• https://drafts.csswg.org/css-inline/ (1 time)
• https://en.wikipedia.org/wiki/Graphics_Processing_Unit (1 time)
• https://firefox-source-docs.mozilla.org/devtools-user/page_inspector/how_to/examine_and_edit_css/index.html (1 time)
• https://jpeg.org/jpegxl/ (1 time)
• https://support.mozilla.org/en-US/kb/about-config-editor-firefox (1 time)
• https://www.mozilla.org/en-US/firefox/channel/desktop/ (2 times)
• https://www.mozilla.org/en-US/firefox/developer/ (2 times)

---

URL: /en-US/docs/Mozilla/Firefox/Releases/114
Title: Firefox 114 for developers

• https://bugzil.la/1812591 (2 times) (Note! This may be a new URL 👀)

[hamishwillee]

@Josh-Cena This covers most of what I want to do for indicating module support in workers. There is one thing that isn't really covered in https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules and that is worker scripts.

I was wondering if we should have a section "Scripts in workers" showing how you pass the `{type: "module"}" option in the worker constructor. Then we could just note, as has already been covered, that you can use import/import() in the loaded script for dedicated/shared workers, but not for service workers. Does that make sense to you?

[Josh-Cena]

@hamishwillee The more we load this page, the more I want to split it into two pages "modules at their core" and "modules on the web" 😄 But yes, I think it's very reasonable to add a workers section. FWIW it's merged already, and workers aren't mentioned anywhere anyway, so no hurries.

[hamishwillee]

Thanks for review @sideshowbarker

@Josh-Cena Thanks very much. I've added a note to the linked tracking issue and I'll get to this before the end of the month. I'd split it too, but that's a bigger job, and I have lots of dangling threads that need to be snipped.