Add ButtonProps export (facebook#49593)

Summary:
Pull Request resolved: facebook#49593

Changelog: [Internal]

Reviewed By: huntie

Differential Revision: D69984581

fbshipit-source-id: 1a9607866dee564718081a15f9f6740dfb8dd0e4

Author: j-piasecki

packages/react-native/Libraries/Components/Button.js

@@ -27,7 +27,7 @@ import View from './View/View';
 import invariant from 'invariant';
 import * as React from 'react';
 
-type ButtonProps = $ReadOnly<{
+export type ButtonProps = $ReadOnly<{
   /**
     Text to display inside the button. On Android the given title will be
     converted to the uppercased form.
@@ -286,7 +286,7 @@ const Touchable: typeof TouchableNativeFeedback | typeof TouchableOpacity =
 type ButtonRef = React.ElementRef<typeof Touchable>;
 
 const Button: component(
-  ref: React.RefSetter<ButtonRef>,
+  ref?: React.RefSetter<ButtonRef>,
   ...props: ButtonProps
 ) = React.forwardRef((props: ButtonProps, ref: React.RefSetter<ButtonRef>) => {
   const {

packages/react-native/Libraries/__tests__/__snapshots__/public-api-test.js.snap

@@ -1407,7 +1407,7 @@ declare export default typeof ActivityIndicatorViewNativeComponent;
 `;
 
 exports[`public API should not change unintentionally Libraries/Components/Button.js 1`] = `
-"type ButtonProps = $ReadOnly<{
+"export type ButtonProps = $ReadOnly<{
   title: string,
   onPress: (event?: GestureResponderEvent) => mixed,
   touchSoundDisabled?: ?boolean,
@@ -1440,7 +1440,7 @@ declare const Touchable:
   | typeof TouchableOpacity;
 type ButtonRef = React.ElementRef<typeof Touchable>;
 declare const Button: component(
-  ref: React.RefSetter<ButtonRef>,
+  ref?: React.RefSetter<ButtonRef>,
   ...props: ButtonProps
 );
 declare export default typeof Button;

scripts/build/build-types/buildTypes.js

@@ -37,6 +37,7 @@ const ENTRY_POINTS = [
   'packages/react-native/Libraries/Blob/URLSearchParams.js',
   'packages/react-native/Libraries/Components/AccessibilityInfo/AccessibilityInfo.js',
   'packages/react-native/Libraries/Components/ActivityIndicator/ActivityIndicator.js',
+  'packages/react-native/Libraries/Components/Button.js',
   'packages/react-native/Libraries/Components/Clipboard/Clipboard.js',
   'packages/react-native/Libraries/Components/LayoutConformance/LayoutConformance.js',
   'packages/react-native/Libraries/Components/ToastAndroid/ToastAndroid.js',