test.ts

  const getNextVideo = () => {
    setNextLoading(true)
    for (let i = 0; i < lessons.length; i++) {
      WatchedLessons.WatchedVideo(lessons[i].doc ?? '', user?.uid).then(res => {
        if (res) {
          setNext(lessons[i + 1])
        }
      })
      setNextLoading(false)
    }
  }