Inferring the types from a Remix loader

The loader function in Remix can be inferred automatically using:

type LoaderData = Awaited<ReturnType<typeof loader>>;

• Awaited: Extracts the value returned from a Promise.
• ReturnType: Constructs a type consisting of the return type of a function.

Putting it together:

import { json } from "@remix-run/node"; 

type LoaderData = Awaited<ReturnType<typeof loader>>;
// ^? LoaderData: Response

export const loader = async () => {
  return json({ ok: true });
};