Example Angular2 EventEmitter in TypeScript

example-event-emitter-competition-service.ts

export class CompetitionsService {

    /** Create a EventEmitter - constructing with true to make async */
    onCompetitionsChanged = new EventEmitter<>(true);

    constructor(private _http:Http) {
        _http.get('competitions.json')
            .subscribe(
                data => {
                    //Broadcast the event to anyone who is listening
                    this.onCompetitionsChanged.emit(data.json());
                },
                err => console.error('Failed to load competitions', err),
                () => console.log('Loaded competitions')
            );
    }

}