gulp-imageisux-poll

Waiting till gulp-imageisux truly complete its work.

npm i gulp-imageisux-poll --save-dev

Append the code to imageisux plugin.

gulp.task('isux', function() {
	var dest = '_min';

	return gulp.src(['dist/img/**', '!dist/img/' + dest])
		.pipe(imageisux(dest, false))
		.pipe(imageisuxPoll(dest));
});