Event Emitter with TypeScript

event-emitter.ts

class EventEmitter<T> {
    private _subscription: any[] = []

    constructor() {

    }

    subscribe(habdler) {
        this._subscription.push(habdler)
    }

    undubscribe(handler) {
        let index = this._subscription.indexOf(handler)
        this._subscription.splice(index, 1)
    }

    emit(value: T) {
        this._subscription.forEach(h => {
            if (typeof h === 'function') {
                h(value);
            }
        })
    }
}


class Person {

    onRun: EventEmitter<string>;

    constructor(public name: string) {
        this.onRun = new EventEmitter();
    }


    running() {
        this.onRun.emit(`${this.name} => I 'm running..`)
    }
}


let me = new Person('me');
let you = new Person('you');

you.onRun.subscribe(s => console.log(s));

me.onRun.subscribe(s => {
    console.log(s);
    you.running();
});

setTimeout(() => {
    me.running();
}, 2500)