Add TypeScript worker extension to Monaco Editor for custom diagnostics

[camargo]

Currently expansion rule authoring does not validate numeric ranges for commands because TypeScript type definitions do not support numeric range validation, or regex validation.

This issue is to add support for custom diagnostics (e.g. numeric range validation, regex string validation, etc.) via a custom TypeScript worker in Monaco. We previously attempted to solve this by forking the main TypeScript worker, and adding custom diagnostics. But this solution turned out to be too brittle. It is not easy to use the forked TypeScript worker in the client in an isolated manner. All TypeScript editors needed to use it which is overkill. Also we had worries of keeping the fork up to date with the latest TypeScript worker.

We later found there is a way to create a local custom worker. But there is a PR for a bug that needs to be merged.

We need to:

• See about getting the PR merged
  • Are we still even blocked by this PR?
• Add a custom inline worker with custom diagnostics to the UI for the command expansion editor

[cohansen]

Did some experimenting but this is still not working properly, loading the custom worker throws errors that I can't resolve until that PR is merged.

Uncaught (in promise) TypeError: Failed to execute 'importScripts' on 'WorkerGlobalScope': Module scripts don't support importScripts().
    at create (ts.worker.js?type=module&worker_file:161653:7)
    at EditorSimpleWorker._foreignModuleFactory (ts.worker.js?type=module&worker_file:161668:12)
    at EditorSimpleWorker.loadForeignModule (editorSimpleWorker.js?v=eebc8560:448:40)
    at SimpleWorkerServer._handleMessage (simpleWorker.js?v=eebc8560:357:65)
    at Object.handleMessage (simpleWorker.js?v=eebc8560:342:51)
    at SimpleWorkerProtocol._handleRequestMessage (simpleWorker.js?v=eebc8560:149:38)
    at SimpleWorkerProtocol._handleMessage (simpleWorker.js?v=eebc8560:118:29)
    at SimpleWorkerProtocol.handleMessage (simpleWorker.js?v=eebc8560:111:14)
    at SimpleWorkerServer.onmessage (simpleWorker.js?v=eebc8560:347:24)
    at self.onmessage (editor.worker.js?v=eebc8560:17:22)

[Cobular]

Wooo!!! The core of this now works. It turns out, that PR is not relevant due to minutia with how the monaco build process works, and the above error was caused by a bad but intentional behavior of Vite in development mode. This has been fixed by directly using Esbuild to build our worker scripts and later loading them in! PR incoming.