阿波罗RESTDataSource呼叫其他RESTDataSource？

const { RESTDataSource } = require('apollo-datasource-rest');

class CustomDataSource extends RESTDataSource {
  constructor() {
    super();
    this.baseURL = '<REST API的基本URL>';
  }

  // 定义自己的数据请求方法
  async getCustomData() {
    return this.get('<REST API的特定路径>');
  }
}

const { RESTDataSource } = require('apollo-datasource-rest');

class CustomDataSource extends RESTDataSource {
  constructor() {
    super();
    this.baseURL = '<REST API的基本URL>';
    this.otherDataSource = new OtherDataSource(); // 创建其他的RESTDataSource实例
  }

  // 使用其他数据源获取数据
  async getCustomData() {
    const data = await this.otherDataSource.get('<其他数据源的路径>');
    return data;
  }
}

const { ApolloServer, gql } = require('apollo-server');
const CustomDataSource = require('./CustomDataSource');

const typeDefs = gql`
  type Query {
    customData: [CustomDataType]
  }

  type CustomDataType {
    # 定义自己的字段
  }
`;

const resolvers = {
  Query: {
    customData: async (_, __, { dataSources }) => {
      return dataSources.custom.getCustomData();
    },
  },
};

const server = new ApolloServer({
  typeDefs,
  resolvers,
  dataSources: () => ({
    custom: new CustomDataSource(),
  }),
});

server.listen().then(({ url }) => {
  console.log(`Server ready at ${url}`);
});