Skylark currently makes its direct dependencies available via ctx.files.deps, but doesn't provide any way to get the classpath or full set of transitive dependencies required by the target. This information is critical for integrating with any javac-like tool that requires specifying a classpath, such as GWT or Groovy compilers.

The only workaround is to force these rules to specify all of their transitive dependencies in the BUILD file. This is very cumbersome and sometimes impossible, since transitive dependencies might not actually be visible to the target that needs them.