add 'sketch' and 'vr' as platforms to react-primitives (#28674)

* add 'sketch' and 'vr' as platforms to react-primitives

* Update index.d.ts

* fixed lint warnings

* added test

types/react-primitives/index.d.ts

@@ -1,6 +1,7 @@
 // Type definitions for react-primitives 0.6
 // Project: https://github.com/lelandrichardson/react-primitives
 // Definitions by: Ahmed Ghoneim <https://github.com/aghoneim92>
+//                 David Pett <https://github.com/davidpett>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.8
 
@@ -11,7 +12,7 @@ import {
     Easing,
     Image,
     PixelRatio,
-    Platform,
+    PlatformOSType as RNPlatformOSType,
     StyleSheet,
     Text,
     TouchableOpacityProps,
@@ -20,13 +21,21 @@ import {
 
 export const Touchable: ComponentType<TouchableOpacityProps>;
 
+// react-primitives also supports react-sketchapp and react-vr as platforms
+export type PlatformOSType = RNPlatformOSType | 'sketch' | 'vr';
+export interface PlatformStatic {
+    OS: PlatformOSType;
+    Version: number | string;
+    select<T>(specifics: { [platform in PlatformOSType | 'default']?: T }): T;
+}
+export const Platform: PlatformStatic;
+
 export {
     Animated,
     Dimensions,
     Easing,
     Image,
     PixelRatio,
-    Platform,
     StyleSheet,
     Text,
     View

types/react-primitives/react-primitives-tests.tsx

@@ -49,6 +49,9 @@ export default class Component extends React.Component<{}, State> {
             duration: 10000,
             easing: Easing.cubic
         }).start();
+        if (Platform.OS === 'sketch') {
+            console.log('The Platform is sketch');
+        }
     }
 
     render() {