Gulp+browswerSync task not working why?

Question

gulp.js

Knowledgeable people tell me what needs to be done to make the task work? Gulp version 4.0.2

gulp.task('script', function(){
  gulp.src('js/*.js')
  .pipe(browserSync.reload({stream: true}))
});

mistake:

Answer 1

It turns out that it was necessary to add return

gulp.task('script', function(){
  return gulp.src('js/*.js')
  .pipe(browserSync.reload({stream: true}))
});

Answer 2

In Gulp4, you need to signal task completion for each function.
To solve this problem, try changing your current code:

gulp.task('script', done => {
  gulp.src('js/*.js')
  .pipe(browserSync.reload({stream: true}))
  done();
});