From 0db09e33b1937c0807a96736970a153fdd129667 Mon Sep 17 00:00:00 2001
From: hawkgs <hawk.dvp@gmail.com>
Date: Thu, 18 Dec 2025 12:17:47 +0200
Subject: [PATCH] fix(devtools): false positive app not detected

Since Manifest V3, the service worker (background) gets terminated after 30s of inactivity. This can break the initialization phase of DevTools or the BE-FE communication channel, if already initialized. To prevent that, we emit a heartbeat in a >30s interval.
---
 .../projects/shell-browser/src/app/content-script.ts  | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/devtools/projects/shell-browser/src/app/content-script.ts b/devtools/projects/shell-browser/src/app/content-script.ts
index a0bec5fcd64..bd3ab8c6353 100644
--- a/devtools/projects/shell-browser/src/app/content-script.ts
+++ b/devtools/projects/shell-browser/src/app/content-script.ts
@@ -19,10 +19,21 @@ const port = chrome.runtime.connect({
   name: `${document.title || location.href}`,
 });
 
+// Since Manifest V3, the service worker (background)
+// gets terminated after 30s of inactivity. This can
+// break the initialization phase of DevTools or the
+// BE-FE communication channel, if already initialized.
+// To prevent that, we emit a heartbeat in a >30s interval.
+const HEARTBEAT_INTERVAL = 20000; // Keep below 30s
+const heartbeatInterval = setInterval(() => {
+  port.postMessage('__NG_DEVTOOLS_BEAT');
+}, HEARTBEAT_INTERVAL);
+
 const handleDisconnect = (): void => {
   localMessageBus.emit('shutdown');
   localMessageBus.destroy();
   chromeMessageBus.destroy();
+  clearInterval(heartbeatInterval);
   backgroundDisconnected = true;
 };