Help, generated Prisma shape mismatches with Prisma Client type

[2coo]

We extended our prisma client with our custom bignumber extension that converts string fields into BigNumber object.
And now, generated types by @pothos/prisma-plugin generator is mismatching.

Types of property `price` are incompatible. Type `BigNumber` is not assignable to type `string`

[2coo]

For now, migrated to builder.objectRef from builder.prismaObject

const db = new PrismaClient().$extends(BigNumberExtension);

type ExtendedProduct = Prisma.Payload<
  typeof db.product,
  "findUnique"
>["scalars"];

export const ProductObject =
  builder.objectRef <
  ExtendedProduct >
  "Product".implement({
    fields: (t) => ({
      id: t.expose("id", {
        type: "ObjectID",
      }),
      name: t.exposeString("name"),
      description: t.exposeString("description"),
      price: t.field({
        type: "BigNumber",
        resolve: (product) => product.price,
      }),
    }),
  });

builder.queryField("product", (t) =>
  t.field({
    type: ProductObject,
    args: {
      id: t.arg({
        type: "ObjectID",
        required: false,
      }),
    },
    resolve: async (_parent, { id }) => {
      // now there is no type mismatching error
      return db.product.findUniqueOrThrow({
        where: { id },
      });
    },
  })
);

[2coo]

Instead of relying on @pothos/prisma-plugin generator.
Can we infer all types from Prisma Client using type utilities in the future pothos version?

[hayes]

It should be possible to entirely infer the generated types from the prisma client instead. The first versions of the prisma plugin worked this way. It ended up causing type-checking performance problems, and generating the types was the easiest way to get types that would be efficient for type-checking, but I don't think there is something that would prevent creating a type like: PrismaTypesFromClient<typeof prisma> that could be used instead of the generated types.

There are some relevant examples of extracting types from the client here: prisma/prisma#5315 (comment). I'd be open adding a utility type for this to the plugin, but I'm not sure I have time right now to prioritize it. If you are interested in contributing it, I'd be more than happy to help out and point you in the right direction!

[hayes]

This is the interface that needs to be generated for each model:

export interface PrismaModelTypes {
  Name: string;
  Shape: {};
  Include: unknown;
  Select: unknown;
  OrderBy: unknown;
  Where: {};
  WhereUnique: {};
  Create: {};
  Update: {};
  ListRelations: string;
  RelationName: string;
  Relations: Record<
    string,
    {
      Shape: unknown;
      Name: string;
      Nullable: boolean;
    }
  >;
}

[hayes]

ListRelations and RelationName would be string unions like 'author' | 'comments'