feat(MapView): remove redundant static members

BREAKING CHANGE: Components are no longer available as static members of
MapView. They must now be imported explicitly if used.

src/MapView.tsx

@@ -9,21 +9,7 @@ import {
   NativeSyntheticEvent,
   LayoutChangeEvent,
 } from 'react-native';
-import MapMarker from './MapMarker';
-import MapPolyline from './MapPolyline';
-import MapPolygon from './MapPolygon';
-import MapCircle from './MapCircle';
-import MapCallout from './MapCallout';
-import MapCalloutSubview from './MapCalloutSubview';
-import MapOverlay from './MapOverlay';
-import MapUrlTile from './MapUrlTile';
-import MapWMSTile from './MapWMSTile';
-import MapLocalTile from './MapLocalTile';
-import MapHeatMap from './MapHeatmap';
-import AnimatedRegion from './AnimatedRegion';
-import Geojson from './Geojson';
 import {
-  contextTypes as childContextTypes,
   getAirMapName,
   googleMapIsInstalled,
   createNotSupportedComponent,
@@ -171,6 +157,8 @@ export type NativeCommandName =
   | 'getMarkersFrames';
 
 class MapView extends React.Component<Props, State, SnapShot> {
+  static viewConfig = viewConfig;
+
   private map: any; // todo: narrow down type
   private __lastRegion: Region | undefined;
   private __layoutCalled: boolean | undefined;
@@ -651,11 +639,6 @@ class MapView extends React.Component<Props, State, SnapShot> {
   }
 }
 
-MapView.viewConfig = viewConfig;
-MapView.childContextTypes = childContextTypes;
-
-MapView.MAP_TYPES = MAP_TYPES;
-
 //todo: narrow down types
 const airMaps: any = {
   default: requireNativeComponent('AIRMap'),
@@ -687,30 +670,4 @@ if (!NativeModules.UIManager.getViewManagerConfig) {
 
 export const Animated = RNAnimated.createAnimatedComponent(MapView);
 
-/**
- * TODO:
- * All of these properties on MapView are unecessary since they can be imported
- * individually with the es6 exports in index.js. Removing them is a breaking change,
- * but potentially allows for better dead code elimination since references are not
- * kept to components which are never used.
- */
-
-MapView.Marker = MapMarker;
-MapView.Polyline = MapPolyline;
-MapView.Polygon = MapPolygon;
-MapView.Circle = MapCircle;
-MapView.UrlTile = MapUrlTile;
-MapView.MapWMSTile = MapWMSTile;
-MapView.LocalTile = MapLocalTile;
-MapView.Heatmap = MapHeatMap;
-MapView.Overlay = MapOverlay;
-MapView.Callout = MapCallout;
-MapView.CalloutSubview = MapCalloutSubview;
-Object.assign(MapView, ProviderConstants);
-
-MapView.Animated = Animated;
-MapView.AnimatedRegion = AnimatedRegion;
-
-MapView.Geojson = Geojson;
-
 export default MapView;