[react-native-i18n] Add type for react-native-i18n module (#24790)

* Add type for react-native-i18n

* Fix tests with correct typescript version

types/react-native-i18n/index.d.ts

@@ -0,0 +1,11 @@
+// Type definitions for react-native-i18n 2.0
+// Project: https://github.com/AlexanderZaytsev/react-native-i18n
+// Definitions by: Vincent Langlet <https://github.com/VincentLanglet>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.2
+
+import I18n = require("i18n-js");
+
+export function getLanguages(): Promise<string[]>;
+
+export default I18n;

types/react-native-i18n/react-native-i18n-tests.ts

@@ -0,0 +1,10 @@
+import I18n, { getLanguages } from 'react-native-i18n';
+
+getLanguages().then(languages => languages[0]);
+
+I18n.defaultLocale = 'en';
+I18n.fallbacks = true;
+I18n.translations = {};
+I18n.locale = 'fr';
+
+const currentLocale: string = I18n.currentLocale();

types/react-native-i18n/tsconfig.json

@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "strictFunctionTypes": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "react-native-i18n-tests.ts"
+    ]
+}

types/react-native-i18n/tslint.json

@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }