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工作示例

安装依赖：

npm i --save @nestjs/graphql apollo-server-express graphql-tools graphql

app.module.ts

import { Module } from '@nestjs/common';// import { AppController } from './app.controller';import { AppService } from './app.service';import { GraphQLModule } from '@nestjs/graphql';import { AppResolver } from './app.resolvers';@Module({ imports: [ GraphQLModule.forRoot({ typePaths: ['./**/*.graphql'], }), ], // controllers: [AppController], providers: [AppService, AppResolver],})export class AppModule {}

定义 typeDefs ：

// app.graphqltype Query { hello: String}

定义 resolvers ：

// app.resolvers.tsimport { Query, Resolver } from '@nestjs/graphql';@Resolver()export class AppResolver { constructor() {} @Query() hello(): string { return 'hello nest.js'; }}

启动服务器，访问 http://localhost:5000/graphql

// 发送query { hello }// 返回{ "data": { "hello": "hello nest.js" }}