Google Closure Compiler Extern Definitions for Firebase Supports Firebase 2.2.x. Strongly typed in order to help uncover mistakes in your code. Includes @deprecated methods. Includes methods which have @nosideeffects :-) Annotate your code with these types Firebase Firebase.Value, i.e. {(Object|string|number|boolean)} Firebase.Query Firebase.DataSnapshot for values passed into your callbacks. AngularFire annotations: /** * @param {!angularFire.$firebaseObject} $firebaseObject * @param {!angularFire.$firebaseArray} $firebaseArray * @param {!angularFire.$firebaseAuth} $firebaseAuth * @ngInject */ function foo ($firebaseObject, $firebaseArray, $firebaseAuth) { var ref = new Firebase('https://<name>.firebaseio.com/'); /** * @type {!angularFire.FirebaseObject} */ var obj = $firebaseObject(ref); /** * @type {!angularFire.FirebaseArray} */ var arr = $firebaseArray(ref); /** * @type {!angularFire.FirebaseAuth} */ var auth = $firebaseAuth(ref); }