Add types for facebook-locales (#36231)

types/facebook-locales/facebook-locales-tests.ts

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+import { bestFacebookLocaleFor } from 'facebook-locales';
+
+bestFacebookLocaleFor('en_US'); // $ExpectType string

types/facebook-locales/index.d.ts

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+// Type definitions for facebook-locales 1.0
+// Project: https://github.com/wix/facebook-locales
+// Definitions by: Jarek Radosz <https://github.com/CvX>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/**
+ * Maps locales to Facebook locales.
+ *
+ * @example
+ *
+ * import { bestFacebookLocaleFor } from 'facebook-locales';
+ *
+ * bestFacebookLocaleFor('en_US'); //-> 'en_US'
+ * bestFacebookLocaleFor('fr_FR'); //-> 'fr_FR'
+ * bestFacebookLocaleFor('es_AR'); //-> 'es_LA'
+ * bestFacebookLocaleFor('ar_EG'); //-> 'ar_AR'
+ */
+export function bestFacebookLocaleFor(locale: string): string;

types/facebook-locales/tsconfig.json

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

types/facebook-locales/tslint.json

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