Packages support (sourcemaps)

[PaperPrototype]

Using sourcemaps you can alias the import of libraries

esm.sh allows you to import JavaScript modules from http URLs, no installation/build steps needed.

import * as mod from "https://esm.sh/PKG[@SEMVER][/PATH]";

With import maps, you can even use bare import specifiers instead of URLs:

<script type="importmap">
  {
    "imports": {
      "react": "https://esm.sh/react@19.1.0",
      "react-dom/": "https://esm.sh/react-dom@19.1.0/"
    }
  }
</script>
<script type="module">
  import React from "react"; // → https://esm.sh/react@19.1.0
  import { render } from "react-dom/client"; // → https://esm.sh/react-dom@19.1.0/client
</script>

More usages about import maps can be found in the Using Import Maps section.

[PaperPrototype]

So it seems workers don't support sourcemaps yet but it is in progress.

Although there is a shim that this stackoverflow has https://stackoverflow.com/questions/75042411/how-can-i-set-importmap-in-a-web-worker

[PaperPrototype]

guybedford/es-module-shims#206

[PaperPrototype]

whatwg/html#10858