import { Directive, EventEmitter, Input, OnInit, Output } from '@angular/core'
+import 'rxjs/add/operator/debounceTime'
import 'rxjs/add/operator/distinct'
+import 'rxjs/add/operator/filter'
+import 'rxjs/add/operator/map'
import 'rxjs/add/operator/startWith'
import { fromEvent } from 'rxjs/observable/fromEvent'