Flow strict TextProps (facebook#22122)

Summary:
Related to facebook#22100

Turn on Flow strict mode for TextProps.
I used ResponseHandlers type definition defined in Text.js.

I wanted to move ResponseHandlers type to TextProps and reuse it inside the file.
I know I could use $Shape<> to maybe keys but how do I elegantly maybe every values ?
Unless having a straightforward solution, I found it clearer to copy paste these types.

- All flow tests succeed.

[GENERAL] [ENHANCEMENT] [TextProps.js] - Flow strict mode
Pull Request resolved: facebook#22122

Reviewed By: TheSavior

Differential Revision: D13055759

Pulled By: RSNara

fbshipit-source-id: 230b43c7c94d7f82f5727ad11541b0cb98bc5e3a

Libraries/Text/Text.js

@@ -27,10 +27,10 @@ import type {PressRetentionOffset, TextProps} from 'TextProps';
 
 type ResponseHandlers = $ReadOnly<{|
   onStartShouldSetResponder: () => boolean,
-  onResponderGrant: (event: SyntheticEvent<>, dispatchID: string) => void,
-  onResponderMove: (event: SyntheticEvent<>) => void,
-  onResponderRelease: (event: SyntheticEvent<>) => void,
-  onResponderTerminate: (event: SyntheticEvent<>) => void,
+  onResponderGrant: (event: PressEvent, dispatchID: string) => void,
+  onResponderMove: (event: PressEvent) => void,
+  onResponderRelease: (event: PressEvent) => void,
+  onResponderTerminate: (event: PressEvent) => void,
   onResponderTerminationRequest: () => boolean,
 |}>;
 
@@ -93,12 +93,12 @@ class TouchableText extends React.Component<Props, State> {
   touchableHandleLongPress: ?(event: PressEvent) => void;
   touchableHandlePress: ?(event: PressEvent) => void;
   touchableHandleResponderGrant: ?(
-    event: SyntheticEvent<>,
+    event: PressEvent,
     dispatchID: string,
   ) => void;
-  touchableHandleResponderMove: ?(event: SyntheticEvent<>) => void;
-  touchableHandleResponderRelease: ?(event: SyntheticEvent<>) => void;
-  touchableHandleResponderTerminate: ?(event: SyntheticEvent<>) => void;
+  touchableHandleResponderMove: ?(event: PressEvent) => void;
+  touchableHandleResponderRelease: ?(event: PressEvent) => void;
+  touchableHandleResponderTerminate: ?(event: PressEvent) => void;
   touchableHandleResponderTerminationRequest: ?() => boolean;
 
   state = {
@@ -173,25 +173,25 @@ class TouchableText extends React.Component<Props, State> {
         }
         return shouldSetResponder;
       },
-      onResponderGrant: (event: SyntheticEvent<>, dispatchID: string): void => {
+      onResponderGrant: (event: PressEvent, dispatchID: string): void => {
         nullthrows(this.touchableHandleResponderGrant)(event, dispatchID);
         if (this.props.onResponderGrant != null) {
           this.props.onResponderGrant.call(this, event, dispatchID);
         }
       },
-      onResponderMove: (event: SyntheticEvent<>): void => {
+      onResponderMove: (event: PressEvent): void => {
         nullthrows(this.touchableHandleResponderMove)(event);
         if (this.props.onResponderMove != null) {
           this.props.onResponderMove.call(this, event);
         }
       },
-      onResponderRelease: (event: SyntheticEvent<>): void => {
+      onResponderRelease: (event: PressEvent): void => {
         nullthrows(this.touchableHandleResponderRelease)(event);
         if (this.props.onResponderRelease != null) {
           this.props.onResponderRelease.call(this, event);
         }
       },
-      onResponderTerminate: (event: SyntheticEvent<>): void => {
+      onResponderTerminate: (event: PressEvent): void => {
         nullthrows(this.touchableHandleResponderTerminate)(event);
         if (this.props.onResponderTerminate != null) {
           this.props.onResponderTerminate.call(this, event);

Libraries/Text/TextProps.js

@@ -4,7 +4,7 @@
  * This source code is licensed under the MIT license found in the
  * LICENSE file in the root directory of this source tree.
  *
- * @flow
+ * @flow strict-local
  * @format
  */
 
@@ -106,12 +106,12 @@ export type TextProps = $ReadOnly<{
    * See https://facebook.github.io/react-native/docs/text.html#onpress
    */
   onPress?: ?(event: PressEvent) => mixed,
-  onResponderGrant?: ?Function,
-  onResponderMove?: ?Function,
-  onResponderRelease?: ?Function,
-  onResponderTerminate?: ?Function,
-  onResponderTerminationRequest?: ?Function,
-  onStartShouldSetResponder?: ?Function,
+  onResponderGrant?: ?(event: PressEvent, dispatchID: string) => void,
+  onResponderMove?: ?(event: PressEvent) => void,
+  onResponderRelease?: ?(event: PressEvent) => void,
+  onResponderTerminate?: ?(event: PressEvent) => void,
+  onResponderTerminationRequest?: ?() => boolean,
+  onStartShouldSetResponder?: ?() => boolean,
   onTextLayout?: ?(event: TextLayoutEvent) => mixed,
 
   /**