fix(js) provide default value for optional ‘assetType’

js/CameraRoll.js

@@ -10,6 +10,7 @@
 'use strict';
 
 import RNCCameraRoll from './nativeInterface';
+
 const invariant = require('fbjs/lib/invariant');
 
 const GROUP_TYPES_OPTIONS = {
@@ -159,6 +160,9 @@ class CameraRoll {
    * See https://facebook.github.io/react-native/docs/cameraroll.html#getphotos
    */
   static getPhotos(params: GetPhotosParams): Promise<PhotoIdentifiersPage> {
+    if (!params.assetType) {
+      params.assetType = ASSET_TYPE_OPTIONS.All;
+    }
     if (arguments.length > 1) {
       console.warn(
         'CameraRoll.getPhotos(tag, success, error) is deprecated.  Use the returned Promise instead',

js/__tests__/__snapshots__/CameraRollTest.js.snap

@@ -14,6 +14,7 @@ exports[`CameraRoll Should call getPhotos 1`] = `
 Array [
   Array [
     Object {
+      "assetType": "All",
       "first": 0,
     },
   ],

typings/CameraRoll.d.ts

@@ -29,7 +29,7 @@ export interface GetPhotosParams {
   groupName?: string,
   assetType?: AssetType
   mimeTypes?: Array<string>,
-};
+}
 
 export interface PhotoIdentifier {
   node: {