//----------- Jeito Feio

// Routes
// ...
controller: "UserController",
controllerAs: "$ctrl",
resolve: {
  user: ($stateParams, UserService) => UserService.getUser($stateParams.id);
}
// ...
// Controller
function UserController(user){
  this.user = user;
}
// ...


//------------ Jeito Lindo

// Routes
// ...
controller: "UserController",
controllerAs: "$ctrl",
resolve: {
  user: UserController => UserController.resolve();
}
// ...
// Controller
function UserController($stateParams, UserService){
  this.resolve = () => {
    return UserService.getUser($stateParams.id).then(user => this.user = user);
  }
}
// ...