How to get Typescript Type from ObjectRef and InputObjectRef?

[trancong12102]

Can I get vanilla Typescript Type from ObjectRef and InputObjectRef?
E.g,

const HelloObject = builder.simpleObject('Hello', {
  fields: (t) => ({
    message: t.string(),
  }),
});

I want to get

type Hello = {
  message: string;
}

How to do this? Thanks for your help!

[hayes]

There should probably be a docs section on this somewhere, but here are a few examples of helpers you could use:

import SchemaBuilder, {
  InputShapeFromTypeParam,
  InputTypeParam,
  InputTypeRef,
  ObjectRef,
  SchemaTypes,
  ShapeFromTypeParam,
  TypeParam,
} from '@pothos/core';

type InferInputType<T extends InputTypeRef<unknown>> = T extends InputTypeRef<infer S> ? S : never;
type InferOutputType<T extends ObjectRef<unknown>> = T extends ObjectRef<infer S> ? S : never;

const input: InferInputType<typeof ExampleInput> = { id: 1, ids: [] };
const output: InferOutputType<typeof User> = { firstName: 'a', lastName: 'b' };

// Support for lists, scalars, and other methods of referencing types
type BetterInferInputType<
  Builder extends PothosSchemaTypes.SchemaBuilder<any>,
  T extends InputTypeParam<Types>,
  Types extends SchemaTypes = Builder extends PothosSchemaTypes.SchemaBuilder<infer S> ? S : never,
> = InputShapeFromTypeParam<Types, T, true>;

type BetterInferOutputType<
  Builder extends PothosSchemaTypes.SchemaBuilder<any>,
  T extends TypeParam<Types>,
  Types extends SchemaTypes = Builder extends PothosSchemaTypes.SchemaBuilder<infer S> ? S : never,
> = ShapeFromTypeParam<Types, T, false>;

const input2: BetterInferInputType<typeof builder, ['String']> = ['a', 'b'];
const output2: BetterInferOutputType<typeof builder, ['String']> = ['a', 'b'];

[trancong12102]

It worked great! Thank you so much.

[hayes]

Just added an easier API for some of these use-cases: https://pothos-graphql.dev/docs/guide/inferring-types