nestjs

• https://github.com/nestjs/nest/blob/master/sample/23-type-graphql/schema.gql

循环引用

可以通过将两个服务的共同特征提取到一个新的服务中来避免循环依赖

• https://blog.logrocket.com/understanding-dependency-inversion-principle-typescript/
• https://juejin.cn/post/7114134078676287495#what-is-a-circular-dependency