findNodeHandle also accepts base react-native components (#15444)

* findNodeHandle also accepts base react-native components

We're also able to pass in base react-native components like View, TextView, etc. to findNodeHandle

* Added static tests for findNodeHandle definition

* Removed trailing whitespace

* Okay NOW all trailing white-space is removed

types/react-native/index.d.ts

@@ -8418,7 +8418,7 @@ export function requireNativeComponent<P>(
     extraConfig?: {nativeOnly?: any}
 ): React.ComponentClass<P>;
 
-export function findNodeHandle(componentOrHandle: null | number | React.Component<any, any>): null | number;
+export function findNodeHandle(componentOrHandle: null | number | React.Component<any, any> | React.ComponentClass<any>): null | number;
 
 export function processColor(color: any): number;
 

types/react-native/test/index.tsx

@@ -25,6 +25,7 @@ import {
     View,
     ViewStyle,
     ViewPagerAndroid,
+    findNodeHandle
 } from 'react-native';
 
 function testDimensions() {
@@ -88,20 +89,43 @@ const stylesAlt = StyleSheet.create(
     }
 )
 
+class CustomView extends React.Component<{}, {}> {
+
+    render() {
+        return (
+            <Text>Custom View</Text>
+        );
+    }
+
+}
 
 class Welcome extends React.Component<any, any> {
     refs: {
-      [key: string]: any
-      rootView: View
+        [key: string]: any
+        rootView: View
+        customView: CustomView
     }
 
     testNativeMethods() {
-      // this.setNativeProps({});
+        // this.setNativeProps({});
 
-      const { rootView } = this.refs;
+        const { rootView } = this.refs;
+
+        rootView.measure((x: number, y: number, width: number, height: number) => {
+        });
+
+    }
+
+    testFindNodeHandle() {
+
+        const { rootView, customView } = this.refs;
+
+        let nativeComponentHandle = findNodeHandle(rootView);
+
+        let customComponentHandle = findNodeHandle(customView);
+
+        let fromHandle = findNodeHandle(customComponentHandle);
 
-      rootView.measure((x: number, y: number, width: number, height: number) => {
-      });
     }
 
     render() {
@@ -117,6 +141,7 @@ class Welcome extends React.Component<any, any> {
                     Press Cmd+R to reload,{'\n'}
                     Cmd+D or shake for dev menu
                 </Text>
+                <CustomView ref="customView" />
             </View>
         )
     }