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Spread object into Map in TypeScript

Using TypeScript, is it possible to type the following Map more acurately?

export const animalsMap = new Map<AnimalIdsEnum, object>([
    [
        AnimalIdsEnum.sylvester,
        {
            id: AnimalIdsEnum.sylvester,
            ...new CatAnimalData("Sylvester", "Tweety");
        }
    ],
    [
        AnimalIdsEnum.tweety,
        {
            id: AnimalIdsEnum.tweety,
            ...new BirdAnimalData("Tweety", "Sylvester");
        },
    ],
]);

Where:

export class AbstractAnimalData {

    name:string,
}

export class CatAnimalData extends AbstractAnimalData {

    favouriteFood:string,
    // NB: Leaving out the constructor for brevity
}

export class BirdAnimalData extends AbstractAnimalData {
    
    archEnemy:string,
    // NB: Leaving out the constructor for brevity
}

Basically, this map structure is very convenient to use in practice, but I am not sure if it is possible to get it typed more accurately, given that:

  • I am spreading the animal data into the map
  • The value part of the map is the id plus the animal data (so more than just the XAnimalData type)

Note: In practice, the objects created by new CatAnimalData("Sylvester", "Tweety"); and new BirdAnimalData("Tweety", "Sylvester"); are imported from separate files. For convenience and clarity, I do not want to assign the id keys in those files, but only in the Map.

about 4 years ago · Juan Pablo Isaza
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