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Does anybody know how these companies development environments look like? I know about Piper at Google but how do the rest manage? Does every single engineer have the entire monorepo in their machines?

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At facebook, a virtual filesystem (https://github.com/facebookexperimental/eden) + change monitor (https://facebook.github.io/watchman/) = source control operations run in O(files I have modified) instead of O(size of repository) time

Very interesting, thanks!

Most places I know of use Git Virtual File System or equivalents.

It is my understanding that VFSForGit only works on Windows.

The github repo has instructions for running it on Mac and says that the stable Mac version is under active development.

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