thick-teal

`createServerFn` type inference incompatible with Zod v4 `z.looseObject()` — `[x: string]: unknown`

When using

z.discriminatedUnion

z.discriminatedUnion

with

z.looseObject()

z.looseObject()

(the Zod v4 recommended replacement for

z.object().passthrough()

z.object().passthrough()

) as the

inputValidator

inputValidator

for

createServerFn

createServerFn

, TypeScript reports type errors because the inferred type includes

[x: string]: unknown

[x: string]: unknown

, which is not assignable to what

createServerFn

createServerFn

internally expects (

[x: string]: {}

[x: string]: {}

TanStack•4w ago