Error: Unexpected usage at EditorSimpleWorker.loadForeignModule shows on console

[cirosantilli]

After microsoft/monaco-editor-webpack-plugin#156 I open test/dist/index.html on Chromium 85 and the editor does seem to work, but I see the following errors on Js console:

simpleWorker.js:30 Could not create web worker(s). Falling back to loading web worker code in main thread, which might cause UI freezes. Please see https://github.com/microsoft/monaco-editor#faq
logOnceWebWorkerWarning @ simpleWorker.js:30
simpleWorker.js:32 Failed to construct 'Worker': Script at 'file:///home/ciro/git/monaco-editor-webpack-plugin/test/dist/editor.worker.js' cannot be accessed from origin 'null'.
logOnceWebWorkerWarning @ simpleWorker.js:32
simpleWorker.js:32 Failed to construct 'Worker': Script at 'file:///home/ciro/git/monaco-editor-webpack-plugin/test/dist/ts.worker.js' cannot be accessed from origin 'null'.
logOnceWebWorkerWarning @ simpleWorker.js:32
editorSimpleWorker.js:468 Uncaught (in promise) Error: Unexpected usage
    at EditorSimpleWorker.loadForeignModule (webpack:///../node_modules/monaco-editor/esm/vs/editor/common/services/editorSimpleWorker.js?:468)
    at eval (webpack:///../node_modules/monaco-editor/esm/vs/editor/common/services/webWorker.js?:44)
errors.js:20 Uncaught Error: Unexpected usage

Error: Unexpected usage
    at EditorSimpleWorker.loadForeignModule (webpack:///../node_modules/monaco-editor/esm/vs/editor/common/services/editorSimpleWorker.js?:468)
    at eval (webpack:///../node_modules/monaco-editor/esm/vs/editor/common/services/webWorker.js?:44)
    at eval (webpack:///../node_modules/monaco-editor/esm/vs/base/common/errors.js?:20)

There are some related error message threads at:

• EditorSimpleWorker.loadForeignModule #2122
• Uncaught Error: Unexpected usage #1384
• Error: Unexpected usage (integration with vue) #1385
• Uncaught Error: Unexpected usage #1690

but I haven't tried to read them too much yet.

[cirosantilli]

Oh, it works if I run it with a local server e.g.:

cd test/dist
python3 -m http.server

and then open it on http://0.0.0.0:8000/

I wonder if there's a way to also make it work with file://? Not a huge deal for me though.