Method constructor

lib/internal/timers.js:652–666

(callback, args)

class Immediate {
  constructor(callback, args) {
    this._idleNext = null;
    this._idlePrev = null;
    this._onImmediate = callback;
    this._argv = args;
    this._destroyed = false;
    this[kRefed] = false;

    initAsyncResource(this, 'Immediate');

    this.ref();
    immediateInfo[kCount]++;

    immediateQueue.append(this);
  }

  ref() {
    if (this[kRefed] === false) {