diff --git a/gulpfile.js b/gulpfile.js
index 72ba850..2cd1593 100644
--- a/gulpfile.js
+++ b/gulpfile.js
@@ -99,16 +99,20 @@ gulp.task('useRef', function () {
 });
 
 gulp.task('concatSwRegistration', function () {
+	const bundleFile = fs
+		.readdirSync('app')
+		.filter(allFilesPaths => allFilesPaths.match(/bundle.*\.js$/) !== null)[0];
+
+	console.log('matched', bundleFile);
+
 	return gulp
-		.src(['src/service-worker-registration.js', 'app/script.js'], {
-			allowEmpty: true
-		})
-		.pipe(concat('script.js'))
+		.src(['src/service-worker-registration.js', `app/${bundleFile}`])
+		.pipe(concat(bundleFile))
 		.pipe(gulp.dest('app'));
 });
 
 gulp.task('minify', function () {
-	minifyJs('app/script.js');
+	// minifyJs('app/script.js');
 	// minifyJs('app/vendor.js');
 	minifyJs('app/lib/screenlog.js');
 
diff --git a/package.json b/package.json
index 28be54a..b63a47b 100644
--- a/package.json
+++ b/package.json
@@ -4,7 +4,7 @@
 	"description": "A blazing fast & offline web playground",
 	"scripts": {
 		"start": "concurrently --kill-others \"gulp start-preview-server\" \"npm run -s dev\"",
-		"build": "preact build --template src/index.html --prerender false --no-inline-css",
+		"build": "preact build --template src/index.html --prerender false --no-inline-css --sw false --esm false",
 		"dev": "preact watch --template src/index.html",
 		"serve-website": "cd packages/website; npm start",
 		"build-website": "cd packages/website; npm run build",