Unable to load web workers in Electron app with Webpack

monaco-editor version: 0.20.0
Browser: Electron 8 (chromium)
OS: MacOS 10.15.6
Repo with reproducible issue: https://github.com/alanqthomas/electron-webpack-monaco-test

I've created a basic Electron app using the boilerplate from. https://github.com/electron-react-boilerplate/electron-react-boilerplate

I also added a custom language implementation, basically just copy/pasting the relevant bits from https://github.com/amazzalel-habib/TodoLangEditor.

I get the following errors when monaco tries to load the web worker:

I've searched far and wide on github and stack overflow for solutions but I can't seem to find anything that works. I have a feeling this might have more to do with webpack/the build, but I'm not sure if that's an issue with my configuration or a limitation of monaco editor.

Please see the linked repo to reproduce the issue. It can be run with yarn install followed by yarn dev. The relevant webpack config is in configs/webpack.config.renderer.dev.babel.js.

Any pointers in the right direction would be much appreciated.

Clone the linked reproduction repository, run yarn install and yarn dev, and reproduce the worker-loading errors. Start with configs/webpack.config.renderer.dev.babel.js and compare its setup with the Electron and Monaco worker-loading path. Done means the custom-language web worker loads without the reported errors.