From 5592652504e9e46e84aa85c3bb0404211cc9e581 Mon Sep 17 00:00:00 2001
From: Milan Burda <milan.burda@gmail.com>
Date: Thu, 14 Oct 2021 20:24:04 +0200
Subject: [PATCH] feat: warn when ipcRenderer.sendSync() called with no
 listeners for channel (#31344)

---
 lib/browser/api/web-contents.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/browser/api/web-contents.ts b/lib/browser/api/web-contents.ts
index b62ca2b9e266..8bb863a0eb21 100644
--- a/lib/browser/api/web-contents.ts
+++ b/lib/browser/api/web-contents.ts
@@ -593,6 +593,9 @@ WebContents.prototype._init = function () {
       ipcMainInternal.emit(channel, event, ...args);
     } else {
       addReplyToEvent(event);
+      if (this.listenerCount('ipc-message-sync') === 0 && ipcMain.listenerCount(channel) === 0) {
+        console.warn(`WebContents #${this.id} called ipcRenderer.sendSync() with '${channel}' channel without listeners.`);
+      }
       this.emit('ipc-message-sync', event, channel, ...args);
       ipcMain.emit(channel, event, ...args);
     }