deduplicate json config file access

apps/backend/src/services/notification/config-service.ts

@@ -1,7 +1,7 @@
-import fs from 'node:fs'
 import path from 'node:path'
 
 import { PROJECT_ROOT } from '../../config/runtime.js'
+import { readJsonFile, writeJsonFile } from '../../utils/json-file-store.js'
 
 const NOTIFICATION_CONFIG_FILE_PATH = path.join(PROJECT_ROOT, 'data', 'notification-config.json')
 const DEFAULT_BARK_SERVER_URL = 'https://api.day.app'
@@ -17,10 +17,7 @@ export function getNotificationConfig() {
 }
 
 export function saveNotificationConfig(rawValue: unknown) {
-  const normalized = normalizeNotificationConfig(rawValue)
-  fs.mkdirSync(path.dirname(NOTIFICATION_CONFIG_FILE_PATH), { recursive: true })
-  fs.writeFileSync(NOTIFICATION_CONFIG_FILE_PATH, `${JSON.stringify(normalized, null, 2)}\n`, 'utf8')
-  return normalized
+  return writeJsonFile(NOTIFICATION_CONFIG_FILE_PATH, rawValue, normalizeNotificationConfig)
 }
 
 export function listEnabledBarkRecipients(config: JsonObject = getNotificationConfig()) {
@@ -33,16 +30,11 @@ export function listEnabledBarkRecipients(config: JsonObject = getNotificationCo
 }
 
 function loadNotificationConfigFromFile() {
-  if (!fs.existsSync(NOTIFICATION_CONFIG_FILE_PATH)) {
-    return createDefaultNotificationConfig()
-  }
-
-  try {
-    const rawText = fs.readFileSync(NOTIFICATION_CONFIG_FILE_PATH, 'utf8')
-    return normalizeNotificationConfig(JSON.parse(rawText))
-  } catch {
-    return createDefaultNotificationConfig()
-  }
+  return readJsonFile(
+    NOTIFICATION_CONFIG_FILE_PATH,
+    createDefaultNotificationConfig,
+    normalizeNotificationConfig,
+  )
 }
 
 function normalizeNotificationConfig(rawValue: unknown) {