wait function

//Async func run one by one
function wait(callback) {
  var queue = [];

  function _next() {
      var cb = queue.shift(),
          args = [].slice.call(arguments);

      if (cb) {
          cb(_next,args);
      }
  }

  setTimeout(_next, 0);

  var then = function(cb) {
      queue.push(cb);
      return { then: then }
  }

  return then(callback);
}

//Использование


wait((next)=>{

  startSession(cnf);
  next();

})

.then((next)=>{

  getAuthData().then((userData)=>{next(userData)});

})

.then((next,userData)=>{

  const statusLoad = new Spinner('Auth in vk...');

  statusLoad.start(); 

  login(userData).then((user)=>{
     statusLoad.stop();
     clear();
     next(user);
  });

})

.then((next, user)=>{

  drawMainMenu(cnf).then((answer)=>{
    next(user, answer);
  });

})

.then((next, answer)=>{

  actions[answer[1].result](answer[0][0])
  .then((mes)=>{
    for(i=0,l=mes.items.length; i<l; i++){
      console.dir(mes.items[i]);
    }
  });

// next(user);
})