Make async function to sync function without npm fiber

async2Sync.js

var restunResult = aNormalSyncFunc();

function aNormalSyncFunc() {
  
  var deAsync = require('deasync');
  var taskDoneCount = 0;
  
  //task 1 is happening
  tasks1(param, function(res1){
    //do something with data
    taskDoneCount++;
  });
  
  //task 2 is happening
  tasks2(param, function(res2){
    //do something with data
    taskDoneCount++;
  });
  
  //task 3 is happening
  tasks3(param, function(res3){
    //do something with data
    taskDoneCount++;
  });
  
  
  //task 4 is happening
  tasks4(param, function(res4){
    //do something with data
    taskDoneCount++;
  });
  
  //since total async task count is 4, while loop will wait till total 4 tasks done.
  while(taskDoneCount <= 4) {deAsync.sleep(100);}
  //return anything you want. do something.. because it will return after 4 tasks are completed.
  return true;
  
}