diff --git a/.gitignore b/.gitignore
index 4911536c5..d9ea5a9bb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -4,6 +4,7 @@
 .settings
 .vertx
 .vscode
+.download
 target
 *.iml
 sandbox
diff --git a/es4x/src/main/java/io/reactiverse/es4x/impl/ESModuleIO.java b/es4x/src/main/java/io/reactiverse/es4x/impl/ESModuleIO.java
index b3b2695ae..830e48335 100644
--- a/es4x/src/main/java/io/reactiverse/es4x/impl/ESModuleIO.java
+++ b/es4x/src/main/java/io/reactiverse/es4x/impl/ESModuleIO.java
@@ -242,6 +242,7 @@ public String readFile(URI uri, boolean main, boolean adapt) throws IOException
     if (adapt) {
       return adapt(content);
     }
+    // TODO: extract the sourcemap if present and store it so the logger can use it
     return content;
   }
 
diff --git a/es4x/src/main/java/io/reactiverse/es4x/impl/MJSVerticleFactory.java b/es4x/src/main/java/io/reactiverse/es4x/impl/MJSVerticleFactory.java
index b9f5dcd6b..d9cc595f7 100644
--- a/es4x/src/main/java/io/reactiverse/es4x/impl/MJSVerticleFactory.java
+++ b/es4x/src/main/java/io/reactiverse/es4x/impl/MJSVerticleFactory.java
@@ -78,6 +78,7 @@ public void start(Promise<Void> startPromise) {
           try {
             // the main script buffer
             final Buffer buffer = vertx.fileSystem().readFileBlocking(fsVerticleName);
+            // TODO: parse sourcemap and store it for the logger
             final Source source = Source
               .newBuilder("js", new File(fsVerticleName))
               // strip the shebang if present
diff --git a/examples/bundle-rollup/package.json b/examples/bundle-rollup/package.json
new file mode 100644
index 000000000..8307350aa
--- /dev/null
+++ b/examples/bundle-rollup/package.json
@@ -0,0 +1,25 @@
+{
+  "name": "bundle-rollup",
+  "version": "1.0.0",
+  "private": true,
+  "description": "A barebones application",
+  "main": "bundle.js",
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@vertx/core": "latest",
+    "@vertx/web": "latest"
+  },
+  "devDependencies": {
+    "@vertx/unit": "latest",
+    "@es4x/create": "latest",
+    "rollup": "latest",
+    "@rollup/plugin-node-resolve": "latest"
+  },
+  "scripts": {
+    "postinstall": "es4x install",
+    "prestart": "rollup -c",
+    "start": "es4x"
+  }
+}
diff --git a/examples/bundle-rollup/rollup.config.mjs b/examples/bundle-rollup/rollup.config.mjs
new file mode 100644
index 000000000..691141b14
--- /dev/null
+++ b/examples/bundle-rollup/rollup.config.mjs
@@ -0,0 +1,19 @@
+// rollup.config.mjs
+import resolve from '@rollup/plugin-node-resolve';
+
+export default {
+  input: 'src/index.mjs',
+  output: {
+    sourcemap: true,
+    file: 'bundle.js',
+    format: 'cjs'
+  },
+  plugins: [
+    resolve({
+      // pass custom options to the resolve plugin
+      moduleDirectories: ['node_modules']
+    })
+  ],
+  // indicate which modules should be treated as external
+  external: ['lodash']
+};
diff --git a/examples/bundle-rollup/src/index.mjs b/examples/bundle-rollup/src/index.mjs
new file mode 100644
index 000000000..bc80c3c57
--- /dev/null
+++ b/examples/bundle-rollup/src/index.mjs
@@ -0,0 +1,12 @@
+import { Router } from '@vertx/web';
+import { home } from './routes.mjs';
+
+const app = Router.router(vertx);
+
+console.log(typeof home);
+
+app.route('/').handler(home);
+
+vertx.createHttpServer()
+  .requestHandler(app)
+  .listen(8080);
diff --git a/examples/bundle-rollup/src/index.test.mjs b/examples/bundle-rollup/src/index.test.mjs
new file mode 100644
index 000000000..fa7a50cfe
--- /dev/null
+++ b/examples/bundle-rollup/src/index.test.mjs
@@ -0,0 +1,10 @@
+import { TestSuite } from '@vertx/unit';
+
+const suite = TestSuite.create("the_test_suite");
+
+suite.test("my_test_case", function (context) {
+  var s = "value";
+  context.assertEquals("value", s);
+});
+
+suite.run();
diff --git a/examples/bundle-rollup/src/routes.mjs b/examples/bundle-rollup/src/routes.mjs
new file mode 100644
index 000000000..79e71bf10
--- /dev/null
+++ b/examples/bundle-rollup/src/routes.mjs
@@ -0,0 +1,4 @@
+export function home(ctx) {
+  ctx.response()
+    .end('Hello from Vert.x Web!');
+}