From 8af769934f06be821b6eb5a9d687d661c4faff3a Mon Sep 17 00:00:00 2001
From: James Berry <69924001+jlalmes@users.noreply.github.com>
Date: Wed, 1 Apr 2026 12:00:00 +0800
Subject: [PATCH] [console-plugin] Feat: Record `unhandledrejection` event
 (#1104)

* feat/console-plugin/add-unhandledrejection-handler

* better error

* change the window object to the passed in 'win'

* empty

* improve serialized error messages

---------

Co-authored-by: Yun Feng <yun.feng0817@gmail.com>
---
 .../rrweb/src/plugins/console/record/index.ts | 65 ++++++++++++++-----
 1 file changed, 47 insertions(+), 18 deletions(-)

diff --git a/packages/rrweb/src/plugins/console/record/index.ts b/packages/rrweb/src/plugins/console/record/index.ts
index 47cd5136..221292c4 100644
--- a/packages/rrweb/src/plugins/console/record/index.ts
+++ b/packages/rrweb/src/plugins/console/record/index.ts
@@ -114,25 +114,54 @@ function initLogObserver(
   const cancelHandlers: listenerHandler[] = [];
   // add listener to thrown errors
   if (logOptions.level.includes('error')) {
-    if (window) {
-      const errorHandler = (event: ErrorEvent) => {
-        const message = event.message,
-          error = event.error as Error;
-        const trace: string[] = ErrorStackParser.parse(
-          error,
-        ).map((stackFrame: StackFrame) => stackFrame.toString());
-        const payload = [stringify(message, logOptions.stringifyOptions)];
-        cb({
-          level: 'error',
-          trace,
-          payload,
-        });
-      };
-      window.addEventListener('error', errorHandler);
-      cancelHandlers.push(() => {
-        if (window) window.removeEventListener('error', errorHandler);
+    const errorHandler = (event: ErrorEvent) => {
+      const message = event.message,
+        error = event.error as Error;
+      const trace: string[] = ErrorStackParser.parse(
+        error,
+      ).map((stackFrame: StackFrame) => stackFrame.toString());
+      const payload = [stringify(message, logOptions.stringifyOptions)];
+      cb({
+        level: 'error',
+        trace,
+        payload,
       });
-    }
+    };
+    win.addEventListener('error', errorHandler);
+    cancelHandlers.push(() => {
+      win.removeEventListener('error', errorHandler);
+    });
+    const unhandledrejectionHandler = (event: PromiseRejectionEvent) => {
+      let error: Error;
+      let payload: string[];
+      if (event.reason instanceof Error) {
+        error = event.reason;
+        payload = [
+          stringify(
+            `Uncaught (in promise) ${error.name}: ${error.message}`,
+            logOptions.stringifyOptions,
+          ),
+        ];
+      } else {
+        error = new Error();
+        payload = [
+          stringify('Uncaught (in promise)', logOptions.stringifyOptions),
+          stringify(event.reason, logOptions.stringifyOptions),
+        ];
+      }
+      const trace: string[] = ErrorStackParser.parse(
+        error,
+      ).map((stackFrame: StackFrame) => stackFrame.toString());
+      cb({
+        level: 'error',
+        trace,
+        payload,
+      });
+    };
+    win.addEventListener('unhandledrejection', unhandledrejectionHandler);
+    cancelHandlers.push(() => {
+      win.removeEventListener('unhandledrejection', unhandledrejectionHandler);
+    });
   }
   for (const levelType of logOptions.level) {
     cancelHandlers.push(replace(logger, levelType));