Generic depth parameter should be exposed to the user

[djfhe]

Currently, we do not exposed the depth parameter, since interference of other generic Parameters (e.g. Path, PathValue) would stop. See this issue for further information: https://github.com/microsoft/TypeScript/issues/26242

This would kill the benefit of controlling how far typescript goes to give auto completion for the path parameter, since u would have to explicitly pass it.

This issue exists to keep track of the problem.