Animate loading message in console.log

animateLoading.js

const twirlTimer = function () {
  let P = ['\\', '|', '/', '-']
  let x = 0
  return setInterval(function () {
    process.stdout.write('\r' + P[x++])
    x &= 3
  }, 250)
}

const animateLoading = function (fullLength: number, current: number = 0) {
  current = (current / fullLength) * 40
  fullLength = 40

  process.stdout.write('\r')

  for (let i = 0; i < current; i++) {
    process.stdout.write('▷')
  }
  for (let i = 0; i < fullLength - current; i++) {
    process.stdout.write('*')
  }
}

class LoadingConsole {
  constructor (
    private loadingChrs = ['\\', '|', '/', '-'],
    private timer = 0,
    private interval = null
  ) {}

  static run (loadingChrs, timer) {
    return setInterval(function () {
      process.stdout.write('\r' + loadingChrs[timer++])
      timer &= 3
    }, 250)
  }

  public start () {
    this.interval = LoadingConsole.run(this.loadingChrs, this.timer)
  }

  public end () {
    clearInterval(this.interval)
  }
}