Microsoft uses monorepos, and you have access to Microsoft's tools! They chose to work with Git and amend it when necessary, just like Meta did with Mercurial.

Microsoft uses monorepos, and you have access to Microsoft's tools! They chose to work with Git and amend it when necessary, just like Meta did with Mercurial. A few years ago they had a Virtual File System extension for Git. Now it's a public fork of Git that is intended for large repositories (several hundreds of GB). It adds a `git scalar` command, see https://github.com/microsoft/git/blob/HEAD/contrib/scalar/docs/index.md https://github.com/microsoft/git/blob/HEAD/contrib/scalar/do...