Right now we majorly rely on maintainers to do testing and sanity checks before every release manually. Considering that we now support both AMD and ESM and we have 5 built in extensions shipped with Monaco Editor, an automatic build and test pipeline can help us avoid shipping broken bits as much as possible.

• Fetch master from VS Code and build Monaco Editor core from it
  • Throw when build and tree shaking fails
• Test the core and ensure the basic functionalities work

CI configuration is defined in https://github.com/microsoft/monaco-editor/blob/master/.github/workflows/ci.yml