tests/auto/blackbox/testdata/typescript/animals.ts


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export interface Mammal {
    speak(): string;
}

export class Cat implements Mammal {
    public speak() {
        return "Meow"; // a cat says meow
    }
}

export class Dog implements Mammal {
    public speak() {
        return "Woof"; // a dog says woof
    }
}

export class Human implements Mammal {
    public speak() {
        return "Hello";
    }
}