Has the new standard been added to gulpfile.js?

Question

gulp.js

Hello.
Once such a record worked, but now it has stopped working?
gulp.task('watch', function() {
gulp.watch([paths.pug.load[0], paths.pug.load[1]], ['pug:build', reload]);
gulp.watch ([paths.sass.load[0], paths.sass.load[1]], ['sass:build', reload]);
});
How can you optimize so that it works again?
gulp.task('watch', function() {
gulp.watch([paths.pug.load[0],paths.pug.load[1]], gulp.series('pug:build'));
}) ;
That's how it works! But there is no reloading of the web browser (And what new features of series, parallel appeared?

Answer 1

gulp.task('watch', function() {
  gulp.watch([paths.pug.load[0],paths.pug.load[1]], gulp.series(
    'pug:build',
    done => {
      reload();
      done();
    }
  ));
});

And what new features of series, parallel appeared?

this mystery of humanity, which can be solved by reading the documentation