From bb2a8caddc4b4aebb10bcc1fc2a20e3133e0897c Mon Sep 17 00:00:00 2001
From: Mustafa Senoglu <mmustafasenoglu0@gmail.com>
Date: Fri, 26 Jun 2026 18:02:42 +0300
Subject: [PATCH] fix: enable Chokidar polling for Vite HMR in Docker on
 Windows

Native fs events do not propagate from Windows hosts into Linux
containers, causing Vite's HMR to stop detecting file changes.

When the DOCKER environment variable is set, Chokidar now falls back
to polling with a 300ms interval, which reliably detects changes
across the Docker volume mount boundary.

Fixes #2456
---
 deployment/docker-compose-local.yaml | 1 +
 frontend/vite.config.ts              | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/deployment/docker-compose-local.yaml b/deployment/docker-compose-local.yaml
index b21637f1..89ee631f 100644
--- a/deployment/docker-compose-local.yaml
+++ b/deployment/docker-compose-local.yaml
@@ -7,6 +7,7 @@ services:
       - VITE_API_HOST=http://localhost:7091
       - VITE_API_STREAMING=$VITE_API_STREAMING
       - VITE_EMBEDDINGS_NAME=$EMBEDDINGS_NAME
+      - DOCKER=true
     ports:
       - "5173:5173"
 
diff --git a/frontend/vite.config.ts b/frontend/vite.config.ts
index ae507f82..a46077e5 100644
--- a/frontend/vite.config.ts
+++ b/frontend/vite.config.ts
@@ -22,6 +22,12 @@ export default defineConfig(({ mode }) => {
             .map((h) => h.trim())
             .filter(Boolean)
         : [],
+      // Use polling for file watching when running inside Docker.
+      // Native fs events do not propagate from Windows hosts into Linux
+      // containers, so Chokidar falls back to polling which works reliably.
+      watch: env.DOCKER
+        ? { usePolling: true, interval: 300 }
+        : undefined,
     },
     test: {
       environment: 'happy-dom',