Method constructor

MyPromise.js:15–21

(cb)

  #onFailBind = this.#onFail.bind(this)

  constructor(cb) {
    try {
      cb(this.#onSuccessBind, this.#onFailBind)
    } catch (e) {
      this.#onFail(e)
    }
  }

  #runCallbacks() {
    if (this.#state === STATE.FULFILLED) {