interface Animal {
  name: string;
}
interface Dog extends Animal {
  bark: () => void;
}
interface Cat extends Animal {
  meow: () => void;
}
const makeNoise = (animal: Animal) => {
  if (animal instanceof Dog) {
    // 'Dog' fait uniquement référence à un type mais s'utilise en tant que valeur ici.ts(2693)
    animal.bark();
  }
};

namespace TaggedUnion {
  interface Dog {
    kind: "dog"; // Tagged union
    bark: () => void;
  }
  interface Cat {
    kind: "cat"; // Tagged union
    meow: () => void;
  }
  type Animal = Dog | Cat;
  const makeNoise = (animal: Animal) => {
    if (animal.kind === "dog") animal.bark();
    else animal.meow();
  };
  const dog: Dog = {
    kind: "dog",
    bark: () => console.log("bark"),
  };
  makeNoise(dog);
}

namespace Classes {
  class Dog {
    constructor(public name: string, public bark: () => void) {}
  }
  class Cat {
    constructor(public name: string, public meow: () => void) {}
  }
  type Animal = Dog | Cat;
  const makeNoise = (animal: Animal) => {
    if (animal instanceof Dog) animal.bark();
    else animal.meow();
  };
  const dog = new Dog("Fido", () => console.log("bark"));
  makeNoise(dog);
}