actions don't get inferred when the type's fields are all optional

[lourenci]

Hi, thanks for the library.

Probably, some mistake from my side. But, I don't get the action inferred when all the type's fields are optional. Shouldn't toolkit infer the action type by the generic of PayloadAction?

ok:

with error:

[phryneas]

Yeah, but at that moment it cannot distinguish it any more from unknown or the empty type (that pretty much equals any).
Could be solvable though. I'll add it to the list.

[lourenci]

Thank you for your reply, @phryneas. I would love to help on this, but I'm a layman with typescript right know.

Just out of knowing what are the side effects on this (probably, you already know): The match function is not being able to infer the payload action.

[phryneas]

Yupp.

For your case, you could do something like an AtLeastOne type:

interface Filters {
  name: string
  age: number
  city: string
}

type AtLeastOne<T extends Record<string, any>> = keyof T extends infer K ? K extends string ? Pick<T, K & keyof T> & Partial<T> : never : never

type AtLeastOneFilter = AtLeastOne<Filters>

[markerikson]

For now we should probably add a docs entry in the "TS Usage" page.