[jagthebeetle]

The lingua franca for Google's building needs is (more or less) bazel, where you say target /a/b/c depends on /dep/v1_1, /dep/xyz, /common/foo, etc.). (There is a filesystem-like hierarchy parallel to, but not necessarily the same as the corresponding repository's directory layout.)

Bazel is extensible via rules [1], so if you really wanted to use NodeJS on your team, you might create a `nodejs_binary` rule that put everything in the right directory and ran some NodeJS packager on it. You'd probably not put it into production.

Also, third-party code lives in a single third-party directory, so yes, internal users could pull down code they wanted (and for which there wasn't a satisfactory internal version already) into that directory: https://opensource.google.com/docs/thirdparty/

[1]: https://docs.bazel.build/versions/0.29.0/skylark/rules.html