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type-graphql

Create GraphQL resolvers and schemas with TypeScript, using classes and decorators!

  • 0.7.0
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  • npm
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What is type-graphql?

type-graphql is a library that allows you to create GraphQL APIs using TypeScript. It leverages TypeScript's type system to define the schema and resolvers, making it easier to maintain and understand. The library provides decorators and other utilities to simplify the creation of GraphQL schemas and resolvers.

What are type-graphql's main functionalities?

Schema Definition

This feature allows you to define your GraphQL schema using TypeScript classes and decorators. The example demonstrates how to create a simple object type and a resolver with a query.

const { buildSchema } = require('type-graphql');
const { Resolver, Query, ObjectType, Field } = require('type-graphql');

@ObjectType()
class SampleObject {
  @Field()
  id: number;

  @Field()
  name: string;
}

@Resolver()
class SampleResolver {
  @Query(() => SampleObject)
  sampleQuery() {
    return { id: 1, name: 'Sample' };
  }
}

async function main() {
  const schema = await buildSchema({
    resolvers: [SampleResolver],
  });
  // Use the schema in your GraphQL server setup
}
main();

Resolvers

Resolvers are used to handle the logic for fetching and manipulating data. This example shows how to create a resolver with a query to get users and a mutation to add a user.

const { Resolver, Query, Arg, Mutation } = require('type-graphql');

@Resolver()
class UserResolver {
  private users = [];

  @Query(() => [String])
  getUsers() {
    return this.users;
  }

  @Mutation(() => String)
  addUser(@Arg('name') name: string) {
    this.users.push(name);
    return name;
  }
}

async function main() {
  const schema = await buildSchema({
    resolvers: [UserResolver],
  });
  // Use the schema in your GraphQL server setup
}
main();

Custom Scalars

Custom scalars allow you to define custom data types in your GraphQL schema. This example demonstrates how to create a custom scalar for handling Date objects.

const { Scalar, CustomScalar } = require('type-graphql');
const { GraphQLScalarType, Kind } = require('graphql');

@Scalar('Date')
class DateScalar implements CustomScalar<string, Date> {
  description = 'Date custom scalar type';

  parseValue(value: string): Date {
    return new Date(value); // value from the client input variables
  }

  serialize(value: Date): string {
    return value.toISOString(); // value sent to the client
  }

  parseLiteral(ast: any): Date {
    if (ast.kind === Kind.STRING) {
      return new Date(ast.value); // value from the client query
    }
    return null;
  }
}

async function main() {
  const schema = await buildSchema({
    resolvers: [],
    scalarsMap: [{ type: Date, scalar: DateScalar }],
  });
  // Use the schema in your GraphQL server setup
}
main();

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Package last updated on 05 Mar 2018

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