TS2515

error TS2515: Non-abstract class ‘Dog’ does not implement inherited abstract member ‘makeNoise’ from class ‘Animal’.

Broken Code ❌

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abstract class Animal {
  abstract makeNoise(): string;
}

class Dog extends Animal {}

Fixed Code ✔️

If we derive a class from an abstract class, then we have to provide an implementation for all its abstract members:

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abstract class Animal {
  abstract makeNoise(): string;
}

class Dog extends Animal {
  makeNoise(): string {
    return 'Woof!';
  }
}

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