code: private List<Node> createDependenciesList(Node n) {
      checkArgument(n.isFunction());
      Node params = NodeUtil.getFunctionParameters(n);
      if (params != null) {
        return createStringsFromParamList(params);
      }
      return new ArrayList<>();
    }
docs: Given a FUNCTION node returns array of STRING nodes representing function
  parameters.
  @param n the FUNCTION node.
  @return STRING nodes.