type Dog = { name: string; furColor: "brown" | "white" };
const addLocation = (animals: Dog[], location: "Italy" | "France") =>
animals.map((animal) => (animal.location = location)); // animal.location throws error (see below)
throws
Property 'location' does not exist on type 'Dog'.ts(2339)Is there a way to keep the Dog type as it is and to introduce a new type like LocationAddedDog in the addLocation function?
When using Array.map, the return value of the function passed is utilized to create the elements of a new array. In your scenario, it would look like this:
type Cat = { name: string; fur: "brown" | "white" };
const addOrigin = (animals: Cat[], origin: "Italy" | "France") =>
animals.map((animal) => ({ ...animal, origin }));
The return type of addOrigin will now contain the origin property.
You can rely on type inference for the rest, but if you wish to define OriginAddedCat, you have a few options:
interface Cat {
name: string;
fur: "brown" | "white";
}
interface OriginAddedCat extends Cat {
origin: "Italy" | "France";
}
or
type OriginAddedCat = Cat & { origin: "Italy" | "France" };
or
type OriginAddedCat = ReturnType<typeof addOrigin>[number];
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