Add typings for react-native-referrer (#29642)

types/react-native-referrer/index.d.ts

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+// Type definitions for react-native-referrer 0.1
+// Project: https://github.com/JeandeCampredon/react-native-referrer
+// Definitions by: Christian Chown <https://github.com/christianchown>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.9
+
+declare let ReactNativeReferrer: {
+    getReferrer(): Promise<string>;
+};
+
+export default ReactNativeReferrer;

types/react-native-referrer/react-native-referrer-tests.tsx

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+import * as React from "react";
+import { Platform } from "react-native";
+import ReactNativeReferrer from "react-native-referrer";
+
+if (Platform.OS === 'android') {
+    ReactNativeReferrer.getReferrer().then(referrerString => {
+        console.log(referrerString);
+    });
+}

types/react-native-referrer/tsconfig.json

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+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "jsx": "react-native",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "react-native-referrer-tests.tsx"
+    ]
+}

types/react-native-referrer/tslint.json

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+{ "extends": "dtslint/dt.json" }