map.ts Cannot find namespace 'google' ionic

gistfile1.txt

import {Component, Input, OnInit} from '@angular/core';
import { Geolocation } from '@ionic-native/geolocation';
import {Observable} from 'rxjs/Observable';
import {Loading,LoadingController} from 'ionic-angular';
import {PickupComponent} from '../pickup/pickup'

declare var google: any;

@Component({
  selector: 'map',
  templateUrl: 'map.html'
})
export class MapComponent implements OnInit {
@Input() isPickupRequested:boolean;

private map: google.maps.Map;
public isMapIdle:boolean;
public st:string;
  constructor(private geolocation: Geolocation,public loadingCtrl: LoadingController) {
  }

  ngOnInit(){
    this.map =this.createMap();
    this.addMapEventListners();
    this.getCurrentLocation().subscribe(location => this.centerLocation(location));
  }

  addMapEventListners(){
    // google.maps.event.addListner(this.map,'dragstart',() => {
    // this.isMapIdle = false; // fires when finger starts moving around
    // });
    // google.maps.event.addListner(this.map,'idle',() => {
    // this.isMapIdle = true; // trigers when mouse stops moving
    // })
  }
  getCurrentLocation(){
    let options = {
      timeout:10000,
      enableHighAccuracy:true
    };
    let loading = this.loadingCtrl.create({content:'Please wait...'});
    loading.present();
    //resp contains the latitude and longitude. //get current position returns a promise
    let locationObs = Observable.create(observable => {
      this.geolocation.getCurrentPosition(options).then((resp) => {
        let lat = resp.coords.latitude;
        let lng = resp.coords.longitude;

        let location = new google.maps.LatLng(lat,lng);
        observable.next(location);
        loading.dismiss();
      },(err) =>{
        console.log(err);
        loading.dismiss();
      })
    })
    return locationObs;
   }

  createMap(location = new google.maps.LatLng(40.712784,-74.005942)){

    let mapOptions = {
      center: location,
      zoom:15,
      mapTypeId:google.maps.MapTypeId.ROADMAP,
      disableDefaultUI:true
    }
    let mapEl = document.getElementById("map");
    let map = new google.maps.Map(mapEl,mapOptions);

    return map;
  }

  centerLocation(location){
    if(location){
      this.map.panTo(location);
    }
    else{
      this.getCurrentLocation().subscribe(currentLoc =>
        this.map.panTo(currentLoc));
    }
  }
}