Remove illegal top level export from web worker script

[NullVoxPopuli]

#124095

This PR fixes an issue I've been having with Monaco, where loading the editor would throw an error about tap level exports not allowed.
I was less worried about this, but I recently added error tracking to my site, and figured if the fix is easy, I may as well fix it 🙃

Details:

• This is how I prepare the workers for use in Monaco, using ESBuild: https://github.com/NullVoxPopuli/limber/blob/main/packages/monaco/build.js#L33
  • I'm using esm as a target, but it shouldn't matter as bundle: true is set (so everything is one file)
• Compiled file deployed here: https://limber.glimdown.com/monaco/editor/editor.worker.js
  • problem:

[NullVoxPopuli]

@mjbvz & @alexdima anything I need to do to move this along? Thanks! <3

[alexdima]

This breaks the ESM build of the editor.

Notice how this method is imported by other scripts e.g. https://github.com/microsoft/monaco-css/blob/f595049d3df420ce88a454f3903835a101ab1be9/src/css.worker.ts#L11

If exporting from the web worker main script is illegal, we could create a new file, e.g. editor.worker.main without any exports.

[alexdima]

I've added an esbuild sample at https://github.com/microsoft/monaco-editor/tree/main/samples/browser-esm-esbuild