Introduction

graphql-codegen-factories is a plugin for GraphQL Code Generator that generates factories from a GraphQL schema and operations. The factories can then be used to mock data, e.g for testing or seeding a database.

For example, given this GraphQL schema:

type User {
  id: ID!
  username: String!
}

The following factory will be generated:

export type User = /* generated by @graphql-codegen/typescript */;

export function createUserMock(props: Partial<User> = {}): User {
  return {
    __typename: "User",
    id: "",
    username: "",
    ...props,
  };
}

It is also possible to generate factories from an operation, for example:

query GetUser {
  user {
    id
    username
  }
}

Will result in the following factories:

export type GetUserQuery = /* generated by @graphql-codegen/typescript-operations */;

export function createGetUserQueryMock(props: Partial<GetUserQuery> = {}): GetUserQuery {
  return {
    __typename: "Query",
    user: createGetUserQueryMock_user({}),
    ...props,
  };
}

export function createGetUserQueryMock_user(props: Partial<GetUserQuery["user"]> = {}): GetUserQuery["user"] {
  return {
    __typename: "User",
    id: "",
    username: "",
    ...props,
  };
}

You can also use a fake data generator to generate realistic factories such as:

import { faker } from "@faker-js/faker";

export function createUserMock(props: Partial<User> = {}): User {
  return {
    __typename: "User",
    id: faker.random.alphaNumeric(16),
    username: faker.lorem.word(),
    ...props,
  };
}

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Introduction

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