diff --git a/backend/windmill-worker/src/bun_executor.rs b/backend/windmill-worker/src/bun_executor.rs
index b3090ac3d9..cec1e28e6c 100644
--- a/backend/windmill-worker/src/bun_executor.rs
+++ b/backend/windmill-worker/src/bun_executor.rs
@@ -718,7 +718,7 @@ pub async fn handle_bun_job(
 
     if !codebase.is_some() && !has_bundle_cache {
         let _ = write_file(job_dir, "main.ts", inner_content).await?;
-    } else if !annotation.native_mode {
+    } else if !annotation.native_mode && codebase.is_none() {
         let _ = write_file(job_dir, "package.json", r#"{ "type": "module" }"#).await?;
     };
 
diff --git a/cli/script.ts b/cli/script.ts
index cdeb5bd708..9faf461495 100644
--- a/cli/script.ts
+++ b/cli/script.ts
@@ -157,22 +157,12 @@ export async function handleFile(
       log.info(`Starting building the bundle for ${path}`);
       const out = await esbuild.build({
         entryPoints: [path],
-        format: "esm",
+        format: "cjs",
         bundle: true,
         write: false,
         platform: "node",
         packages: "bundle",
         target: "node20.15.1",
-        banner: {
-          js: `
-  import { createRequire } from 'module';           
-  import { dirname } from 'path';
-  import { fileURLToPath } from 'url';
-  
-  const require = createRequire(import.meta.url); 
-  const __filename = fileURLToPath(import.meta.url);
-  const __dirname = dirname(__filename);`,
-        },
       });
       bundleContent = out.outputFiles[0].text;
       log.info(`Finished building the bundle for ${path}`);