expo: Add Expo.Linking API. (#26793)

* expo: Add Expo.Linking API.

* expo: Add myself to the list of packagers.

types/expo/expo-tests.tsx

@@ -25,6 +25,7 @@ import {
     ImagePicker,
     ImageManipulator,
     FaceDetector,
+    Linking,
     Svg,
     IntentLauncherAndroid,
     KeepAwake,
@@ -400,6 +401,38 @@ async () => {
     result.faces[0];
 };
 
+async () => {
+    function isBoolean(x: boolean) {
+    }
+    function isString(x: string) {
+    }
+    // Two examples of members inherited from react-native Linking
+    // to prove that inheritence is working.
+    Linking.addEventListener('url', (e) => {
+        e.url === '';
+    });
+    isBoolean(await Linking.canOpenURL('expo://'));
+
+    // Extensions added by expo.
+
+    isString(Linking.makeUrl('path'));
+    isString(Linking.makeUrl('path', { q: 2, u: 'ery', }));
+
+    const {
+        path,
+        queryParams,
+    } = Linking.parse('');
+    isString(path);
+    isString(queryParams['x'] || '');
+
+    const {
+        path: path2,
+        queryParams: queryParams2,
+    } = await Linking.parseInitialURLAsync();
+    isString(path2);
+    isString(queryParams2['y'] || '');
+};
+
 () => (
     <Svg width={100} height={50}>
         <Svg.Rect

types/expo/index.d.ts

@@ -9,6 +9,7 @@
 //                 Moshe Feuchtwanger <https://github.com/moshfeu>
 //                 Michael Prokopchuk <https://github.com/prokopcm>
 //                 Tina Roh <https://github.com/tinaroh>
+//                 Nathan Phillip Brink <https://github.com/binki>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.6
 
@@ -18,6 +19,7 @@ import {
     ColorPropType,
     ImageRequireSource,
     ImageURISource,
+    LinkingStatic as ReactNativeLinkingStatic,
     NativeEventEmitter,
     ViewProps,
     ViewStyle,
@@ -36,6 +38,7 @@ export type ResizeModeStretch = 'stretch';
 export type URISource = ImageURISource;
 
 export interface HashMap { [key: string]: any; }
+export interface StringHashMap { [key: string]: string; }
 
 /** Access the device accelerometer sensor(s) to respond to changes in acceleration in 3d space. */
 export namespace Accelerometer {
@@ -1712,6 +1715,21 @@ export interface LinearGradientProps {
 export class LinearGradient extends Component<LinearGradientProps> { }
 // #endregion
 
+/**
+ * Linking
+ */
+export interface LinkInfo {
+    path: string;
+    queryParams: Partial<StringHashMap>;
+}
+
+export interface LinkingStatic extends ReactNativeLinkingStatic {
+    makeUrl(path: string, queryParams?: HashMap): string;
+    parse(url: string): LinkInfo;
+    parseInitialURLAsync(): Promise<LinkInfo>;
+}
+export const Linking: LinkingStatic;
+
 /**
  * Location
  */