index.js

function create(callback){
  const tasks = []
  let timer = null
  let runningTask = null

  function remove(task){
    const index = tasks.indexOf(task)

    if(index === -1)
      return

    if(runningTask == task)
      clearTimeout(timer)

    tasks.splice(index, 1)

    const nextTask = getNextTask()
    start(nextTask)
  }

  function add(due, payload){
    const task = {
      due,
      payload
    }

    tasks.push(task)

    // if no timer is attached to a task
    if(!runningTask)
      return start(task)

    // current running task will finish earlier than new task return
    if(runningTask.due < task.due)
      return task

    // replace current timer with new task timer as it will finish first
    clearTimeout(timer)
    return start(task)
  }

  function getNextTask(){
    // find next task that will finish first
    if (!tasks.length) return null

    return tasks.reduce((min, task) => {
      return task.due < min.due ? task : min
    }, tasks[0])
  }

  function start(task){
    // save running task
    runningTask = task

    // maximum ms value for setTimeout
    const TIMEOUT_MAX = 2147483647

    let delta = task.due - Date.now()
    let timerExceed = false

    // if task if further in future than TIMEOUT_MAX
    // split the runs up and use TIMEOUT_MAX for the run
    if(delta > TIMEOUT_MAX){
      delta = TIMEOUT_MAX
      timerExceed = true
    }

    timer = setTimeout((task, timerExceed) => {
      // if timer did not exceed TIMEOUT_MAX
      // finish it with executing callback and removing task
      if(!timerExceed){
        // run callback for finished task
        callback(task.payload, task)

        const index = tasks.indexOf(task)

        if (index !== -1) {
          // remove finished task
          tasks.splice(index, 1)
        }
      }

      // get task that will finish next
      const nextTask = getNextTask()

      if(nextTask)
        return start(nextTask)

      runningTask = null
    }, delta, task, timerExceed)

    return task
  }

  return {
    add,
    remove
  }
}

exports.create = create