AsyncBeforeAppInit.js

// Async Before App Init
angular.module('app', [/*...*/])
  .config(function () {
    // register all routes and stuff
  })
  .run(function ($rootScope) {
    $rootScope.$on('$stateChangeStart', function (AsyncValue) {
      if (!AsyncValue.pageAvailable) {
        // send back to home
      }
    });
  });