SOLID Principles in JavaScript

Which SOLID principle is demonstrated in this implementation of shape area calculation?

class Shape {
  area() {
    throw new Error('area() must be implemented');
  }
}

class Rectangle extends Shape {
  constructor(width, height) {
    super();
    this.width = width;
    this.height = height;
  }

  area() {
    return this.width * this.height;
  }
}

class Circle extends Shape {
  constructor(radius) {
    super();
    this.radius = radius;
  }

  area() {
    return Math.PI * this.radius * this.radius;
  }
}

Single Responsibility Principle
Interface Segregation Principle
Liskov Substitution Principle
This code demonstrates the Liskov Substitution Principle (LSP). Each subclass (Rectangle and Circle) can be used in place of the base Shape class without breaking the application. They properly implement the area() method as defined in the base class, maintaining the contract and ensuring that the behavior remains consistent with what clients of the Shape class expect.
Dependency Inversion Principle

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