Flow definition (#308)

* Add flow definition

* Minor chnage to the comments in the TypeScript definition to reflect 1a061eb45222506db8722ea371f68cbc99904549

index.d.ts

@@ -6,10 +6,11 @@ export interface BlurViewProperties {
     | "xlight"
     | "light"
     | "dark"
-    // tvOS only
-    | "extraDark"
+    // tvOS and iOS 10+ only
     | "regular"
-    | "prominent";
+    | "prominent"
+    // tvOS only
+    | "extraDark";
   blurAmount?: number; // 0 - 100
   style?: StyleProp<ViewStyle>;
   viewRef?: number | null;

index.js.flow

@@ -0,0 +1,39 @@
+// @flow
+
+import * as React from 'react';
+import {View} from 'react-native';
+
+type ViewProps = React.ElementProps<typeof View>;
+type ViewStyleProp = $PropertyType<ViewProps, 'style'>;
+
+export type BlurType =
+  | 'xlight'
+  | 'light'
+  | 'dark'
+  // tvOS and iOS 10+ only
+  | 'regular'
+  | 'prominent'
+  // tvOS only
+  | 'extraDark';
+
+export type BlurViewProps = {
+  blurType: BlurType,
+  blurAmount: number, // 0 - 100
+  style?: ?ViewStyleProp,
+  viewRef?: ?React.ElementRef<any>,
+};
+
+export class BlurView extends React.Component<BlurViewProps> {
+  static defaultProps = {
+    blurType: 'dark',
+    blurAmount: 10,
+  };
+}
+
+export type VibrancyViewProps = BlurViewProps;
+
+export class VibrancyView extends React.Component<VibrancyViewProps> {
+  static defaultProps = {
+    blurAmount: 10,
+  };
+}