Adds type

Author: alexkendall

src/WheelPicker.tsx

@@ -99,7 +99,14 @@ const WheelPicker: React.FC<Props> = ({
     onChange(scrollIndex)
   }, [scrollIndex])
 
-  const handleScroll = (event: Object) => {
+  const handleScroll = (event: {
+    nativeEvent: {
+      contentInset: { bottom: number, left: number, right: number, top: number },
+      contentOffset: { x: number, y: number },
+      contentSize: { height: number, width: number },
+      layoutMeasurement: { height: number, width: number },
+    }
+  }) => {
     const positionY = event?.nativeEvent?.contentOffset?.y ?? 0;
     const index = positionY / itemHeight
     setScrollIndex(index)