code: @Nullable
    private static CreatedBy getModuleDependencyTypeFromRhs(@Nullable Node value) {
      if (value == null || !value.isCall()) {
        return null;
      }
      Node callee = value.getFirstChild();
      if (!callee.isGetProp()) {
        return null;
      }
      Node owner = callee.getFirstChild();
      if (!owner.isName() || !owner.getString().equals("goog")) {
        return null;
      }
      return GOOG_DEPENDENCY_CALLS.get(callee.getSecondChild().getString());
    }
docs: Checks if the given rvalue is a goog.require(Type) or goog.forwardDeclare call, and if so
  returns which one.
  
  @return A Closure require (where {@link CreatedBy#isClosureImport()} is true) or null.