How to Check Whether an Angular $q promise Is Resolved

I guess this was added in a recent version of Angular but there seems to be now an $$state object on the promise:

 var deferred = $q.defer();
 console.log(deferred.promise.$$state.status); // 0
 deferred.resolve();
 console.log(deferred.promise.$$state.status); //1 

As noted in the comments this is not recommended as it might break when upgrading your Angular version.