How do I tell Gulp when a task is complete?

I am trying to write a gulp plugin that will count the number of files in a stream. I used this as a starting point :

function count() {

  var count = 0;

  function countFiles(data) {
    count++;
    // added this as per official docs:
    this.queue(data);
  }

  function endStream() {
    console.log(count + " files processed");
    // not doing this as per original post, as it "ends" the gulp chain:
    //this.emit("end");
    // so doing this instead as per official docs:
    this.queue(null);
  }

  return through(countFiles, endStream);
}


module.exports = count;

      

        
        
        
      

    

And here's an example task:

gulp.task("mytask", function () {
  gulp
    .src("...files...")
    .pipe(count());                // <--- here it is
    .pipe(changed("./some/path"))
    .pipe(uglify())
    .pipe(rename({ extname: ".min.js" }))
    .pipe(gulp.dest(./some/path))
    .pipe(count());                // <--- here it is again
});

      

        
        
        
      

    

It works great except it doesn't start / end as expected:

[14:39:12] Using gulpfile c:\foo\bar\baz\gulpfile.js
[14:39:12] Starting 'mytask'...
[14:39:12] Finished 'mytask' after 9.74 ms
9 files processed
5 files processed

      

        
        
        
      

    

This means that the thing is executed asynchronously and ends when the task completes. The docs say you should use a callback or return a stream. This seems to be how it is done.

How do I make this function behave? Is this what I am using the plugin through

and not through2

?