typescript. I want's to write pattern match....

gistfile1.js

interface Matcher {
  caseA (any): any;
	caseB (any): any;
	caseAny (any): any;
}
class Parent {
	data: any;
	constructor (data: any) {
		this.data = data
	}
	match (matcher : Matcher) {
		if (this instanceof A) {
			return matcher.caseA(this.data)
		} else if (this instanceof B) {
			return matcher.caseB(this.data)
		} else {
			return matcher.caseAny(this.data)
		}
	};
}

class A extends Parent {	
}
class B extends Parent {
}

var a = new A("I'm a")
a.match({
	caseA:(data: any) => { console.log("this is A:" + data)},
	caseB:(data: any) => { console.log("this is B:" + data)},
	caseAny:(data: any) => { console.log("any!:" + data)}
})
var b = new B("I'm b")
b.match({
	caseA:(data: any) => { console.log("this is A:" + data)},
	caseB:(data: any) => { console.log("this is B:" + data)},
	caseAny:(data: any) => { console.log("any!:" + data)}
})