From 6a6b9c7cc96572dd20bfee7271f99ead75c5d8d7 Mon Sep 17 00:00:00 2001
From: Ruben Fiszel <ruben@windmill.dev>
Date: Fri, 28 Nov 2025 11:21:17 +0000
Subject: [PATCH] add type import for esm bundle

---
 backend/windmill-worker/src/bun_executor.rs | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/backend/windmill-worker/src/bun_executor.rs b/backend/windmill-worker/src/bun_executor.rs
index 26c59b77ba..a0aacffb18 100644
--- a/backend/windmill-worker/src/bun_executor.rs
+++ b/backend/windmill-worker/src/bun_executor.rs
@@ -14,9 +14,9 @@ use windmill_queue::{append_logs, CanceledBy, MiniPulledJob, PrecomputedAgentInf
 
 use crate::{
     common::{
-        create_args_and_out_file, get_reserved_variables, parse_npm_config, read_file,
-        build_command_with_isolation, read_file_content, read_result, start_child_process, write_file_binary, OccupancyMetrics,
-        StreamNotifier,
+        build_command_with_isolation, create_args_and_out_file, get_reserved_variables,
+        parse_npm_config, read_file, read_file_content, read_result, start_child_process,
+        write_file_binary, OccupancyMetrics, StreamNotifier,
     },
     handle_child::handle_child,
     BUNFIG_INSTALL_SCOPES, BUN_BUNDLE_CACHE_DIR, BUN_CACHE_DIR, BUN_NO_CACHE, BUN_PATH,
@@ -1095,9 +1095,14 @@ pub async fn handle_bun_job(
             "".to_string()
         };
 
+        let codebase_import = if format == BundleFormat::Esm {
+            " with { type: 'js' }"
+        } else {
+            ""
+        };
         let wrapper_content = format!(
             r#"
-import * as Main from "{main_import}";
+import * as Main from "{main_import}{codebase_import}";
 
 import * as fs from "fs/promises";