TypeScript implements keyword

gistfile1.txt

interface IGreeter {
	greeting: string;
	greet() : string;
}

class Greeter implements IGreeter{
	greeting: string;
	constructor (message: string) {
		this.greeting = message;
	}
	greet() {
		return "Hello, " + this.greeting;
	}
}   

var greeter = new Greeter("world");

var button = document.createElement('button')
button.innerText = "Say Hello"
button.onclick = function() {
	alert(greeter.greet())
}

document.body.appendChild(button)