Not able to run an async task from callback of gulp-prompt

[akanshgulati]

gulp.task("watch-confirm", function(done) {
  return gulp.src(web_app_dir).pipe(
    $.prompt.prompt(
      {
        type: "confirm",
        message: `Current tomcat root dir -> ${tomcat_root_dir}, continue?`,
        default: true,
        name: "start"
      },
      function(res) {
        if (res.start) {
          gulp.series("watch");
        } else {
         
          done();
        }
      }
    )
  );
});

The task, watch is async and watches the changes in the file using gulp-watch and run tasks within on the change of JS or CSS. But, once I confirm, I am not getting that 'watch' task is finished.

If I start the watch task from within the callback of the prompt, I get following response:

But, when I try to run the same task from the command line, I get the correct response. Any idea what basically I have to do in this case? Not sure if spawning will help.