index.js

function(procesenv='production', type, data){
  if(procesenv == 'production'){
    initAction(type, data);
  }
  if(procesenv == 'development'){
    initAction(type, data);
  }
}

function initAction(type, data){
  switch(type){
    case 'POST':
      userCreate(...data);
      break;
    case 'GET':
      userInfo(...data);
      break;
    case 'DELETE':
      userDelete(...data);
      break
    default:
      console.log(type, data, 'some fail')
  }
}

function userCreate(email, password){
  //users its array object user; 
  const data = {};
  if(!email || !password){
    console.log('email or password is bad', email, password)
    data.status = 'error';
    return data;
  }else{
    const isUser = users.findIndex(user.email === email)
    if(isUser === -1){
      data.status = 'ok';
      data.user.id = Math.floor(Math.random()*1000);
      data.user.email = email;
      data.user.password = password;
      return data;
    }
  }
  
function userInfo(id){
  const data = {};
  let hasUser = false;
  //users its array object user;  
  users.foreach(user => {
    if(user.id === id){
      hasUser = true
      data.user = user;
    }else{
      hasUser = false;
    }
  })
  if(!id || !hasId){
    data.status = 'error';
    return data;  
  }else{
    data.status = 'ok';
    return data;
  }
}
  
function userDelete(id){
  let isUser = false
  const data = {};
  users.forEach(user => {
    if(user.id === id){
      delet user;
      data.status = 'error';
      return data;
     }
  })
}  
  
}