RN: Switch `View` to `React.forwardRef`

Reviewed By: bvaughn, sophiebits

Differential Revision: D7896711

fbshipit-source-id: c10c8a14a00ac2d67605e6e4fe1a341b4688fdd8

Libraries/Animated/src/createAnimatedComponent.js

@@ -18,7 +18,7 @@ const invariant = require('fbjs/lib/invariant');
 
 function createAnimatedComponent(Component: any): any {
   invariant(
-    typeof Component === 'string' ||
+    typeof Component !== 'function' ||
       (Component.prototype && Component.prototype.isReactComponent),
     '`createAnimatedComponent` does not support stateless functional components; ' +
       'use a class component instead.',

Libraries/Components/View/View.js

@@ -4,23 +4,22 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @flow
  * @format
+ * @flow
  */
 
 'use strict';
 
 const Platform = require('Platform');
 const React = require('React');
-const ReactNative = require('ReactNative');
 const ReactNativeStyleAttributes = require('ReactNativeStyleAttributes');
-const ReactNativeViewAttributes = require('ReactNativeViewAttributes');
 const TextAncestor = require('TextAncestor');
 const ViewPropTypes = require('ViewPropTypes');
 
 const invariant = require('fbjs/lib/invariant');
 const requireNativeComponent = require('requireNativeComponent');
 
+import type {NativeComponent} from 'ReactNative';
 import type {ViewProps} from 'ViewPropTypes';
 
 export type Props = ViewProps;
@@ -32,50 +31,25 @@ export type Props = ViewProps;
  *
  * @see http://facebook.github.io/react-native/docs/view.html
  */
-class View extends ReactNative.NativeComponent<Props> {
+const RCTView = requireNativeComponent(
-  static propTypes = ViewPropTypes;
+  'RCTView',
-
+  {
-  viewConfig = {
+    propTypes: ViewPropTypes,
-    uiViewClassName: 'RCTView',
-    validAttributes: ReactNativeViewAttributes.RCTView,
-  };
-
-  /**
-   * WARNING: This method will not be used in production mode as in that mode we
-   * replace wrapper component View with generated native wrapper RCTView. Avoid
-   * adding functionality this component that you'd want to be available in both
-   * dev and prod modes.
-   */
-  render() {
-    return (
-      <TextAncestor.Consumer>
-        {hasTextAncestor => {
-          // TODO: Change iOS to behave the same as Android.
-          invariant(
-            !hasTextAncestor || Platform.OS !== 'android',
-            'Nesting of <View> within <Text> is not supported on Android.',
-          );
-          return <RCTView {...this.props} />;
-        }}
-      </TextAncestor.Consumer>
-    );
-  }
-}
-
-const RCTView = requireNativeComponent('RCTView', View, {
-  nativeOnly: {
-    nativeBackgroundAndroid: true,
-    nativeForegroundAndroid: true,
   },
-});
+  {
+    nativeOnly: {
+      nativeBackgroundAndroid: true,
+      nativeForegroundAndroid: true,
+    },
+  },
+);
 
 if (__DEV__) {
   const UIManager = require('UIManager');
   const viewConfig =
     (UIManager.viewConfigs && UIManager.viewConfigs.RCTView) || {};
   for (const prop in viewConfig.nativeProps) {
-    const viewAny: any = View; // Appease flow
+    if (!ViewPropTypes[prop] && !ReactNativeStyleAttributes[prop]) {
-    if (!viewAny.propTypes[prop] && !ReactNativeStyleAttributes[prop]) {
       throw new Error(
         'View is missing propType for native prop `' + prop + '`',
       );
@@ -85,8 +59,20 @@ if (__DEV__) {
 
 let ViewToExport = RCTView;
 if (__DEV__) {
-  ViewToExport = View;
+  // $FlowFixMe - TODO T29156721 `React.forwardRef` is not defined in Flow, yet.
+  ViewToExport = React.forwardRef((props, ref) => (
+    <TextAncestor.Consumer>
+      {hasTextAncestor => {
+        // TODO: Change iOS to behave the same as Android.
+        invariant(
+          !hasTextAncestor || Platform.OS !== 'android',
+          'Nesting of <View> within <Text> is not supported on Android.',
+        );
+        return <RCTView {...props} ref={ref} />;
+      }}
+    </TextAncestor.Consumer>
+  ));
+  ViewToExport.displayName = 'View';
 }
 
-// No one should depend on the DEV-mode createClass View wrapper.
+module.exports = ((ViewToExport: any): Class<NativeComponent<ViewProps, any>>);
-module.exports = ((ViewToExport: any): typeof View);

jest/mockComponent.js

@@ -3,23 +3,34 @@
  *
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
+ *
+ * @format
  */
+
 'use strict';
 
-module.exports = moduleName => {
+module.exports = (moduleName, instanceMethods) => {
   const RealComponent = require.requireActual(moduleName);
   const React = require('react');
 
-  const Component = class extends RealComponent {
+  const SuperClass =
+    typeof RealComponent === 'function' ? RealComponent : React.Component;
+
+  const Component = class extends SuperClass {
     render() {
       const name = RealComponent.displayName || RealComponent.name;
 
       return React.createElement(
-        name.replace(/^(RCT|RK)/,''),
+        name.replace(/^(RCT|RK)/, ''),
         this.props,
         this.props.children,
       );
     }
   };
+
+  if (instanceMethods != null) {
+    Object.assign(Component.prototype, instanceMethods);
+  }
+
   return Component;
 };

jest/setup.js

@@ -38,7 +38,7 @@ jest
   .mock('Text', () => mockComponent('Text'))
   .mock('TextInput', () => mockComponent('TextInput'))
   .mock('Modal', () => mockComponent('Modal'))
-  .mock('View', () => mockComponent('View'))
+  .mock('View', () => mockComponent('View', MockNativeMethods))
   .mock('RefreshControl', () => require.requireMock('RefreshControlMock'))
   .mock('ScrollView', () => require.requireMock('ScrollViewMock'))
   .mock(