gulp image compression task with gulp-watch

gistfile1.js

/* Images
******************************************************************************/
gulp.task('images', function() {

  // batch mode
  watch({glob: './source/images/*'})
    .pipe(plumber())
    .pipe(imagemin({
      progressive: true,
      interlaced: true
    }))
    .pipe(gulp.dest('./www'));
    
  
  // The gulp-watch docs said I could also run on each individual file like this, but it doens't work either
  //gulp.src('source/images/*', {read: false})
  //  .pipe(watch())
  //  .pipe(plumber())
  //  .pipe(imagemin({
  //    progressive: true,
  //    interlaced: true
  //  }))
  //  .pipe(gulp.dest('./www'));
});