Enabling Class Method Overrides in Typescript

In my code, I have a base class called Animal which contains some methods. There is also a subclass of this class named Bird, which overrides one of the parent methods to handle a specific edge case.

The structure of these classes is as follows:

class Animal {
  constructor(animal) {
    this.animal = animal;
  }
  public define(){
    return {name: this.animal.name}
  }
}

class Bird extends Animal{
  public define(){
    return {color: this.animal.color}
  }
}

When calling bird.define(), everything seems to work fine. However, TypeScript raises an error stating:

Property 'define' in type 'Bird' is not assignable to the same property in base type 'Animal'. Type '() => { color: string; }' is not assignable to type '() => { name: string }'. Type '{ color: string; }' is missing the following properties from type '{ name: string; }':
name

Is there a way to address this issue without resorting to using ts-ignore?

Answer №1

Check out this clever solution:


interface PetInfo {
    name: string;
    type: string;
}
class Pet {
    constructor(public info: PetInfo) {
        this.info = info;
    }
    public details(): Partial<PetInfo> {
        return { name: this.info.name }
    }
}

class Dog extends Pet {
    public details() {
        return { type: this.info.type }
}

Using ts-ignore is unnecessary in this scenario.

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