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javascriptfirefoxweb-workeres6-modules

Does Firefox really support the `type` option for the Worker constructor?

I can't seem to be able to instantiate a web worker from a ES6 script file. MDN says it should be possible like this:

const worker = new Worker('my-worker.js', {type:"module"});

That doesn't work for me, I get an error:

 SyntaxError: import declarations may only appear at top level of a module

MCVE:

test.html

<html>
<head></head>
<body><script type="text/javascript">
    new Worker("worker.js", { type: "module" });

    </script></body>
</html>

worker.js

import Nothing from "./nothing.js";

Firefox version: 62.0.2

Solution

  • Firefox resolved the support for type: module in February 2023:

    https://bugzilla.mozilla.org/show_bug.cgi?id=1247687

    According Caniuse, this support was shipped as Firefox v114 in June 2023:

    https://caniuse.com/mdn-api_worker_worker_ecmascript_modules