Update react-native-snap-carousel to v2.1.4 (#16669)

types/react-native-snap-carousel/index.d.ts

@@ -7,6 +7,8 @@
 import * as React from 'react';
 import {
     Animated,
+    NativeSyntheticEvent,
+    NativeScrollEvent,
     ScrollViewProperties,
     ScrollViewStyle,
     ViewStyle
@@ -110,6 +112,13 @@ export interface CarouselProps extends React.Props<ScrollViewProperties> {
 
     // Callbacks
 
+    /**
+     * Callback fired while scrolling; direct equivalent of ScrollView's onScroll
+     * Since onScroll is overriden by plugin's implementation, you should use prop onScrollViewScroll
+     * if you need a callback while scrolling.
+     */
+    onScrollViewScroll?(event: NativeSyntheticEvent<NativeScrollEvent>): void;
+
     /**
      * Callback fired when navigating to an item
      */

types/react-native-snap-carousel/react-native-snap-carousel-tests.tsx

@@ -1,5 +1,7 @@
 import * as React from 'react';
 import {
+    NativeSyntheticEvent,
+    NativeScrollEvent,
     StyleSheet,
     Text,
     View,
@@ -23,6 +25,7 @@ class SnapCarouselTest extends React.Component<{}, {}> {
                     enableMomentum={true}
                     keyboardDismissMode='interactive'
                     onSnapToItem={this.onSnapToItem}
+                    onScrollViewScroll={this.onScroll}
                 >
                     <View
                         style={styles.item}
@@ -37,6 +40,10 @@ class SnapCarouselTest extends React.Component<{}, {}> {
     private onSnapToItem = (index: number) => {
         console.log("Snapped to: ", index);
     }
+
+    private onScroll = (event: NativeSyntheticEvent<NativeScrollEvent>) => {
+        console.log("Scrolled: ", event);
+    }
 }
 
 const styles = StyleSheet.create({