code: def target_internal_dependencies(target):
    
    for dep in target.dependencies:
      if isinstance(dep, Jarable):
        yield dep
      else:
        for childdep in target_internal_dependencies(dep):
          yield childdep
docs: Returns internal Jarable dependencies that were "directly" declared.
  
    Directly declared deps are those that are explicitly listed in the definition of a
    target, rather than being depended on transitively. But in order to walk through
    aggregator targets such as `target`, `dependencies`, or `jar_library`, this recursively
    descends the dep graph and stops at Jarable instances.