fix(web): Fix multiple writes race condition on config file watcher

CHANGELOG.md

@@ -10,6 +10,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 - Add search context to ask sourcebot context selector. [#397](https://github.com/sourcebot-dev/sourcebot/pull/397)
 
+### Fixed
+- Fixed multiple writes race condition on config file watcher. [#398](https://github.com/sourcebot-dev/sourcebot/pull/398)
+
 ## [4.6.0] - 2025-07-25
 
 ### Added

packages/web/package.json

@@ -111,6 +111,7 @@
     "ai": "5.0.0-beta.28",
     "ajv": "^8.17.1",
     "bcryptjs": "^3.0.2",
+    "chokidar": "^4.0.3",
     "class-variance-authority": "^0.7.0",
     "client-only": "^0.0.1",
     "clsx": "^2.1.1",

packages/web/src/initialize.ts

@@ -2,7 +2,7 @@ import { ConnectionSyncStatus, OrgRole, Prisma, RepoIndexingStatus } from '@sour
 import { env } from './env.mjs';
 import { prisma } from "@/prisma";
 import { SINGLE_TENANT_ORG_ID, SINGLE_TENANT_ORG_DOMAIN, SOURCEBOT_GUEST_USER_ID, SINGLE_TENANT_ORG_NAME } from './lib/constants';
-import { watch } from 'fs';
+import chokidar from 'chokidar';
 import { ConnectionConfig } from '@sourcebot/schemas/v3/connection.type';
 import { hasEntitlement, loadConfig, isRemotePath, syncSearchContexts } from '@sourcebot/shared';
 import { isServiceError, getOrgMetadata } from './lib/utils';
@@ -227,9 +227,22 @@ const initSingleTenancy = async () => {
 
         // watch for changes assuming it is a local file
         if (!isRemotePath(configPath)) {
-            watch(configPath, () => {
+            const watcher = chokidar.watch(configPath, {
+                ignoreInitial: true,           // Don't fire events for existing files
+                awaitWriteFinish: {
+                    stabilityThreshold: 100,   // File size stable for 100ms
+                    pollInterval: 100          // Check every 100ms
+                },
+                atomic: true                   // Handle atomic writes (temp file + rename)
+            });
+
+            watcher.on('change', async () => {
                 logger.info(`Config file ${configPath} changed. Re-syncing...`);
-                syncDeclarativeConfig(configPath);
+                try {
+                    await syncDeclarativeConfig(configPath);
+                } catch (error) {
+                    logger.error(`Failed to sync config: ${error}`);
+                }
             });
         }
     }

yarn.lock

@@ -6606,6 +6606,7 @@ __metadata:
     ai: "npm:5.0.0-beta.28"
     ajv: "npm:^8.17.1"
     bcryptjs: "npm:^3.0.2"
+    chokidar: "npm:^4.0.3"
     class-variance-authority: "npm:^0.7.0"
     client-only: "npm:^0.0.1"
     clsx: "npm:^2.1.1"
@@ -8714,7 +8715,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"chokidar@npm:^4.0.1":
+"chokidar@npm:^4.0.1, chokidar@npm:^4.0.3":
   version: 4.0.3
   resolution: "chokidar@npm:4.0.3"
   dependencies: