yarn add @giraphql/plugin-simple-objects

import SimpleObjectsPlugin from '@giraphql/plugin-simple-objects';
const builder = new SchemaBuilder({
  plugins: [SimpleObjectsPlugin],
});

import SchemaBuilder from '@giraphql/core';
import SimpleObjectsPlugin from '@giraphql/plugin-simple-objects';
​
const builder = new SchemaBuilder({
  plugins: [SimpleObjectsPlugin],
});
​
const ContactInfo = builder.simpleObject('ContactInfo', {
  fields: (t) => ({
    email: t.string({
      nullable: false,
    }),
    phoneNUmber: t.string({
      nullable: true,
    }),
  }),
});
​
const Node = builder.simpleInterface('Node', {
  fields: (t) => ({
    id: t.id({
      nullable: false,
    }),
  }),
});
​
const UserType = builder.simpleObject('User', {
  interfaces: [Node],
  fields: (t) => ({
    firstName: t.string({}),
    lastName: t.string({}),
    contactInfo: t.field({
      type: ContactInfo,
      nullable: false,
    }),
  }),
});
​
builder.queryType({
  fields: (t) => ({
    user: t.field({
      type: UserType,
      args: {
        id: t.arg.id({ required: true }),
      },
      resolve: (parent, args, { User }) => {
        return {
          id: '1003',
          firstName: 'Leia',
          lastName: 'Organa',
          contactInfo: {
            email: 'leia@example.com',
            phoneNUmber: null,
          },
        };
      },
    }),
  }),
});