How to type either

Quick question. I have an object I'm passing as a parameter. It has the shape

{id: number, name: string, foo: Partial<SomeObject>}

{id: number, name: string, foo: Partial<SomeObject>}

I need either or both id and name, and I require foo. How would I go about typing this?

5 Replies

Amos•3y ago

type SomeObject = Record<string, string>;

type OneOrTheOther =
  | { id: number; foo: Partial<SomeObject> }
  | { name: string; foo: Partial<SomeObject> }
  | { id: number; name: string; foo: Partial<SomeObject> };

const MyThing: OneOrTheOther = { foo: {}, id: 1 };

type SomeObject = Record<string, string>;

type OneOrTheOther =
  | { id: number; foo: Partial<SomeObject> }
  | { name: string; foo: Partial<SomeObject> }
  | { id: number; name: string; foo: Partial<SomeObject> };

const MyThing: OneOrTheOther = { foo: {}, id: 1 };

Does this work?

bentenOP•3y ago

It does, idk why I didn't think of explicitly unioning the three possible versions thanks legend Hmm actually it's not It's telling me that id and name don't exist on type mything when i use it as a param hmm this works apparently

type TUpdateMeal =
  | { id: number; name?: string; newState: Partial<TMeal> }
  | { name: string; id?: number; newState: Partial<TMeal> }

type TUpdateMeal =
  | { id: number; name?: string; newState: Partial<TMeal> }
  | { name: string; id?: number; newState: Partial<TMeal> }

thanks for the help you got me 95% of the way there

Amos•3y ago

Can you do name?: never and id?: never to make it even more explicit (I had that before, but removed it since I thought it worked w/o 😓)

bentenOP•3y ago

Would never imply it can't be two at once?

Amos•3y ago

Yeah you'd have to have the 3rd one saying it can be both

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How to type either