Valibot return types slow down TS check

[gynekolog]

I use valibot (validation library, similiar like zod) for search params validation.

Since @tanstack/react-router 0.0.1-beta.188 the valibot infer types of validation schema hit the typescript performance. Not immediately but each set of search values with function decreases TS speed.

// fine
<Link from="routeId" search={{ sortBy: "asc" }} />

// any usage will slow down TS check
<Link from="routeId" search={(prev => ({ ...prev, sortBy: "asc" })} />

Workaround is to define the return type manually 😞

You can check the issue on stackblitz.

Take a look at the validateSearch in aboutRoute. Try uncommenting prepared variants with handwritten types or zod.
You can use pnpm run typecheck to compare check times.

[gynekolog]

I've been investigating the performance issue because ts check increased from 7s to 24s on the @tanstack/react-router 0.0.1-beta.194. The 0.0.1-beta.193 is fine in my private app but not in the stackblitz example.

There's something weird with the types.