From b130dd07cdd69cb6671ed013fd4b3053a0f8fe09 Mon Sep 17 00:00:00 2001
From: jackie-pc <jackie@pynecone.io>
Date: Tue, 13 Feb 2024 12:02:37 -0800
Subject: [PATCH] print background compile errors ASAP (#2596)

---
 reflex/app_module_for_backend.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/reflex/app_module_for_backend.py b/reflex/app_module_for_backend.py
index 57395e447..d4bc3d1dc 100644
--- a/reflex/app_module_for_backend.py
+++ b/reflex/app_module_for_backend.py
@@ -11,7 +11,10 @@ if "app" != constants.CompileVars.APP:
 
 app_module = get_app(reload=False)
 app = getattr(app_module, constants.CompileVars.APP)
-ThreadPoolExecutor(max_workers=1).submit(app.compile_)
+# Force background compile errors to print eagerly
+ThreadPoolExecutor(max_workers=1).submit(app.compile_).add_done_callback(
+    lambda f: f.result()
+)
 
 # ensure only "app" is exposed.
 del app_module