How to fix Non-abstract class 'X' does not implement inherited abstract member 'Y' in TypeScript

abstract class Animal {
  abstract makeSound(): void;
  abstract move(distance: number): void;
}

// ❌ Error: Non-abstract class 'Dog' does not implement
// inherited abstract member 'move' from class 'Animal'
class Dog extends Animal {
  makeSound(): void {
    console.log("Woof");
  }
  // Missing move() implementation
}

abstract class Animal {
  abstract makeSound(): void;
  abstract move(distance: number): void;
}

class Dog extends Animal {
  makeSound(): void {
    console.log("Woof");
  }

  move(distance: number): void {  // ✅ Correct signature
    console.log(`Running ${distance} meters`);
  }
}

const dog = new Dog();  // ✅ Now works
dog.makeSound();  // "Woof"
dog.move(10);     // "Running 10 meters"

abstract class LivingThing {
  abstract breathe(): void;
}

abstract class Animal extends LivingThing {
  abstract makeSound(): void;
  // breathe() is still abstract here
}

class Dog extends Animal {
  breathe(): void {  // ✅ From LivingThing
    console.log("Breathing...");
  }

  makeSound(): void {  // ✅ From Animal
    console.log("Woof");
  }
}

abstract class LivingThing {
  abstract breathe(): void;
}

abstract class Animal extends LivingThing {
  abstract makeSound(): void;
  // breathe() not implemented here - still abstract
}

abstract class Mammal extends Animal {
  breathe(): void {  // ✅ Implements breathe() from LivingThing
    console.log("Breathing with lungs");
  }
  // makeSound() still abstract
}

class Dog extends Mammal {
  makeSound(): void {  // ✅ Final implementation
    console.log("Woof");
  }
}

abstract class Example {
  abstract process(data: string): number;
  abstract get value(): string;
}

class Implementation extends Example {
  // ❌ Wrong return type
  process(data: string): string {
    return data;
  }

  // ❌ Wrong - should be getter, not method
  value(): string {
    return "value";
  }
}

class CorrectImplementation extends Example {
  // ✅ Correct return type
  process(data: string): number {
    return data.length;
  }

  // ✅ Correct getter syntax
  get value(): string {
    return "value";
  }
}

abstract class Animal {
  abstract makeSound(): void;
  abstract move(): void;
}

// Can't implement move() yet? Make it abstract
abstract class Bird extends Animal {
  makeSound(): void {
    console.log("Chirp");
  }
  // move() still abstract - birds move differently
}

class Penguin extends Bird {
  move(): void {  // ✅ Penguin implements the specific movement
    console.log("Waddling");
  }
}

class Sparrow extends Bird {
  move(): void {  // ✅ Different implementation
    console.log("Flying");
  }
}

// With abstract class (requires inheritance)
abstract class Animal {
  abstract makeSound(): void;
  move(): void {  // Concrete method
    console.log("Moving");
  }
}

// With interfaces (more flexible)
interface Animal {
  makeSound(): void;
  move(): void;
}

class Dog implements Animal {
  makeSound(): void {
    console.log("Woof");
  }

  move(): void {
    console.log("Running");
  }
}

// Can implement multiple interfaces
interface Pet {
  name: string;
}

class NamedDog implements Animal, Pet {
  constructor(public name: string) {}

  makeSound(): void {
    console.log(`${this.name} says Woof`);
  }

  move(): void {
    console.log(`${this.name} is running`);
  }
}