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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

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

  • javascript
  • firefox
  • web-worker
  • es6-modules
Share Improve this question asked Sep 25, 2018 at 18:13 Tomáš ZatoTomáš Zato 53.4k63 gold badges310 silver badges825 bronze badges 3
  • MDN says that Worker works like that, it doesn't say that Firefox has implemented this feature already. – Bergi Commented Sep 25, 2018 at 21:49
  • @Bergi It does not mention the support of the feature at all, either way. – Tomáš Zato Commented Sep 26, 2018 at 10:07
  • As of today, this is still an issue, unfortunately. Tested with Firefox 75.0 – Tacticus Commented Apr 11, 2020 at 18:02
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2 Answers 2

Reset to default 6

No it currently (April 2021) does not, see this feature request for details:
https://bugzilla.mozilla/show_bug.cgi?id=1247687

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

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

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

https://caniuse./mdn-api_worker_worker_ecmascript_modules

本文标签： javascriptDoes Firefox really support the type option for the Worker constructorStack Overflow

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