Chain async functions and execute once or repeat

AsyncChain.js

class AsyncChain {
  constructor() {
    this.queue = []
  }

  funcA() {
    this.queue.push(1000)
    return this
  }

  funcB() {
    this.queue.push(1500)
    return this
  }

  execute(duration) {
    return new Promise(resolve => {
      setTimeout(() => {
        console.log(duration)
        resolve(this)
      }, duration)
    })
  }

  async once() {
    for (const step of this.queue) {
      await this.execute(step)
    }
  }

  async repeat() {
    let i = 0
    while (true) {
      const step = this.queue[i++]
      await this.execute(step)
      if (i == this.queue.length) i = 0
    }
  }

}

// main
const c = new AsyncChain()
c.funcA().funcB().repeat()