Packages

Packages are how BZL organizes code.

A package is a directory container a BUILD[.bazel] file.
The BUILD.bazel defines targets in the package:
- libraries
- binaries
- tests
Targets can depend on other targets in the same package or other packages.
- Visibility can be widened to the subtree or the entiry repository, but – like in Go – it is best to start with the smallest possible scope.
They are visible only within the package by default
Targets flagged testonly can only be used by test targets.