type-graphql-utils

type-graphql-utils

This module provides utilities to transform type-graphql types.

Install

yarn install type-graphql-utils

Usage

import { Field, InputType, ObjectType } from 'type-graphql';
import { Pick, Partial } from 'type-graphql-utils';

@ObjectType()
class User {
  @Field()
  id!: number;

  @Field()
  name!: string;

  @Field()
  email!: string;
}

type User {
  id: String!
  name: String!
  email: String!
}

@InputType()
class UserInput1 extends Partial(User) {
  // extra fields
}

input UserInput1 {
  id: String
  name: String
  email: String
}

@InputType()
class UserInput2 extends Pick(User, { name: 1 }) { }

input UserInput2 {
  name: String!
}

@InputType()
class UserInput3 extends Required(Partial(User), { id: 1 }) {}

input UserInput3 {
  id: String!
  name: String
  email: String
}

API

BaseClass: The type to transform. A class decorated with @InputType() or @ObjectType().

names: The fields to transform. A potentially optional object containing the names of the fields as key, e.g. { id: 1, name: 1 }. The TypeScript type enforces all values to be 1, but the value isn't actually used. We just need the names as object to determine if a name is included in constant time.

Pick(BaseClass, names)

Constructs a type by picking the keys of names from BaseClass.

Omit(BaseClass, names)

Constructs a type by picking all fields from BaseClass and then removing the keys of names.

Partial(BaseClass, [names])

Constructs a type by picking all fields from BaseClass and then setting the keys of names to optional. The opposite of Required. By default, names contains all names.

Required(BaseClass, [names])

Constructs a type by picking all fields from BaseClass and then setting the keys of names to required. The opposite of Partial. By default, names contains all names.