The project contains three parts:
The first part is monaco editor bundle with entry point at src\monaco\reexport.ts. The webpack.monaco.config.js uses to bundle the editor and export as library.
The secod part is monaco editor workers for TypeScript, CSS, HTML, JSON. The webpack.monaco.config.js uses to bundle the workers and export as plain JS to load source into worker as inline text. The webpack.monaco-workers.config.js config uses to bundle workers.
The third part is visual. There is nothing spectial. It's typical visual for Power BI.