How to zoom position in native google maps?

Ionic Framework ionic-v3
1 
ionViewDidLoad() {	GoogleMap.isAvailable().then( () => {	this.loadMap()	}).catch(() => {	alert('Maps not working')	})	}	loadMap() {	let map:GoogleMap = new GoogleMap('map', {	backgroundColor: 'white',	timeout: 10000,	enableHighAccuracy: true,	controls: {	compass: true,	myLocationButton: true,	indoorPicker: true,	zoom: true	},	gestures: {	scroll: true,	tilt: true,	rotate: true,	zoom: true	}	})	let default_location: GoogleMapsLatLng = new GoogleMapsLatLng(AppConfig.DEFAULT_MAP_LOCATION.lat, AppConfig.DEFAULT_MAP_LOCATION.long)	map.one(GoogleMapsEvent.MAP_READY).then(() => {	this.loader.dismiss()	console.log('Map is ready!')	let position: CameraPosition = {	target: default_location,	zoom: 20	}	// // move the map's camera to position	map.moveCamera(default_location);	})	}

The main problem is that i cant set zoom. It is always the same no matter what I did

2

let map:GoogleMap = new GoogleMap(‘map’, {
backgroundColor: ‘white’,
timeout: 10000,
enableHighAccuracy: true,
zoom: 20,
controls: {
compass: true,
myLocationButton: true,
indoorPicker: true,
zoom: true
},
gestures: {
scroll: true,
tilt: true,
rotate: true,
zoom: true
}
})