Sapling should interop with Turborepo

[steveluscher]

Turborepo is a build system that tracks dependencies using artifact hashes. It has a fast mode that relies on SCM information which, when using Sapling, it can't find.

I wonder if Sapling could provide some sort of reasonable ‘API compatibility’ with git by synthesizing just enough of the .git folder to be useful. That way tools that look for a .git folder would Just Work™ (see also #555).

Problem

> turbo run compile:docs compile:js compile:typedefs test:lint test:prettier test:typecheck test:unit:browser test:unit:node test:live-with-test-validator test:treeshakability:browser test:treeshakability:native test:treeshakability:node

 WARNING  cannot find a .git folder. Falling back to manual file hashing (which may be slower). If you are running this build in a pruned directory, you can ignore this message. Otherwise, please initialize a git repository in the root of your monorepo

[quark-zju]

We don't provide a .git by design. You can find some discussions at #182.

[steveluscher]

I realize that, but quitters like me who want nothing but to be able to use the Facebook/Mercurial workflow here on the outside will never be able to use Sapling unless there's an interop story with Jest/Turborepo/Codecov/etc.

[quark-zju]

I think the more practical approach is to add sapling support in jest and turborepo (not the other way around).

[steveluscher]

Makes sense; thank you!