javascript.statements.import - not supported in ServiceWorkers in Firefox

[James-E-A]

What type of issue is this?

Incorrect support data (example: BrowserX says "86" but support was added in "40")

What information was incorrect, unhelpful, or incomplete?

The MDN article on the import statement claims that the import statement is "Available in service workers"[sic] as of Firefox version 114.

What browsers does this problem apply to, if applicable?

Firefox

What did you expect to see?

I expected to see a service worker that used the import statement in its body not fail to evaluate on Firefox version 115.

Did you test this? If so, how?

I tested this on Firefox 115.12.0esr (64-bit) on Windows.

I also tested this on Microsoft Edge version 126.0.2592.68 (Official build) (64-bit) on Windows; but the documentation isn't unambiguously wrong in that case, since Edge — unlike Firefox — supports "module" service workers, which do support the import statement.

Can you link to any release notes, bugs, pull requests, or MDN pages related to this?

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import#browser_compatibility

To be clear, the problem is with the import statement, not the import() function, which is described on a different page and about which I have no complaints today.

Do you have anything more you want to share?

Miminal Reproducible Example: stick these 3 files in a folder and call python -m http.server on it; open localhost:8000 in Firefox, press F12, and check the console for complaints. (Edge has the same error, but puts more informative and relevant details directly into the page's error console.)

<!-- index.html -->
<script type="module">
await navigator.serviceWorker.register('./sw.js');
</script>

/* sw.js */
import { onmessage_sw, onfetch_sw } from "./mod.mjs";

addEventListener('message', onmessage_sw);
addEventListener('fetch', onfetch_sw);

/* mod.mjs */
export function onmessage_sw(event) {
	console.info("Got message event: %o", event);
}

export function onfetch_sw(event) {
	console.info("Got fetch event: %o", event);
}

MDN URL

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import

MDN metadata

MDN page report details

• Query: javascript.statements.import
• Report started: 2024-06-28T19:39:42.992Z