Simple vehicle demo in typescript

interface IVehicle {
	start(type: string): string;
}

interface ITrunk {
	openTrunk(): void
}

interface IWindow {
	openWindow(): void
}

class Vehicle implements IVehicle {
	private color: string;
	
	constructor(color: string) {
		this.color = color;
	}
	
	start(type: string) {
		return 'The ' + this.color + ' ' + type + ' started';
	}
}

class Car extends Vehicle {
	constructor(color: string) {
		super(color);
	}

	start() {
		return super.start('car');
	}
}

class Sedan extends Car implements ITrunk, IWindow {
	constructor(color: string) {
		super(color);
	}
	
	start() {
		return super.start() + ' and it is a Sedan';
	}
	
	openTrunk() {
		console.log('Trunk is open');
	}
	openWindow() {
		console.log('Window is open');
	}
}

class Truck extends Vehicle {
	constructor(color: string) {
		super(color);
	}
	start() {
		return super.start('truck');
	}
}

var car = new Car('green');
var sedan = new Sedan('red');
sedan.openTrunk();
sedan.openWindow();
var truck = new Truck('blue');

console.log(car.start());