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@nestjs/apollo

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@nestjs/apollo

Nest - modern, fast, powerful node.js web framework (@apollo)

  • 12.2.2
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What is @nestjs/apollo?

@nestjs/apollo is a package that integrates Apollo Server with the NestJS framework, allowing developers to build GraphQL APIs with ease. It provides decorators and utilities to create GraphQL schemas, resolvers, and more, leveraging the power of both Apollo Server and NestJS.

What are @nestjs/apollo's main functionalities?

GraphQL Module Setup

This feature allows you to set up the GraphQL module with Apollo Server as the driver. The `autoSchemaFile` option automatically generates the GraphQL schema file.

const { Module } = require('@nestjs/common');
const { GraphQLModule } = require('@nestjs/graphql');
const { ApolloDriver, ApolloDriverConfig } = require('@nestjs/apollo');

@Module({
  imports: [
    GraphQLModule.forRoot<ApolloDriverConfig>({
      driver: ApolloDriver,
      autoSchemaFile: true,
    }),
  ],
})
class AppModule {}

Creating Resolvers

This feature allows you to create GraphQL resolvers using decorators. The `@Resolver` decorator marks the class as a resolver, and the `@Query` decorator defines a query field.

const { Resolver, Query } = require('@nestjs/graphql');

@Resolver()
class SampleResolver {
  @Query(() => String)
  sayHello() {
    return 'Hello World!';
  }
}

Using GraphQL Scalars

This feature allows you to define custom GraphQL scalars. The `@Scalar` decorator is used to create a new scalar type, and methods like `parseValue`, `serialize`, and `parseLiteral` handle the conversion between client and server.

const { Scalar } = require('@nestjs/graphql');
const { Kind } = require('graphql');

@Scalar('Date')
class DateScalar {
  parseValue(value) {
    return new Date(value); // value from the client input variables
  }
  serialize(value) {
    return value.getTime(); // value sent to the client
  }
  parseLiteral(ast) {
    if (ast.kind === Kind.INT) {
      return new Date(parseInt(ast.value, 10)); // ast value is always in string format
    }
    return null;
  }
}

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Package last updated on 04 Dec 2024

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