From 6f1c143eb4a1eae3424b16f30f455627810e7545 Mon Sep 17 00:00:00 2001
From: "posthog[bot]" <206114724+posthog[bot]@users.noreply.github.com>
Date: Mon, 3 Aug 2026 15:11:07 +0000
Subject: [PATCH] fix(browser): downgrade non-Error unhandled rejections to
 warnings

A rejected promise whose reason isn't an Error carries no stack and no
meaningful type. In practice these are almost always injected third-party
scripts (email/link scanners, browser extensions) rejecting a plain value,
not real app faults. Reporting them at the default `error` severity opens a
first-class issue for pure noise.

Report them as `warning` instead: still captured and visible for debugging,
but they no longer sit alongside real errors, and `beforeSend` can drop them
entirely. Error-typed rejections are unchanged.

Generated-By: PostHog Code
Task-Id: d67e689e-e9cc-4d3d-8166-36e2e3333894
---
 packages/runtime-browser/src/index.ts | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/packages/runtime-browser/src/index.ts b/packages/runtime-browser/src/index.ts
index d77d70e..a73d060 100644
--- a/packages/runtime-browser/src/index.ts
+++ b/packages/runtime-browser/src/index.ts
@@ -276,6 +276,14 @@ export function initAutterBrowser(options: AutterBrowserOptions): void {
 			if (isError) {
 				e.errorType = reason.name;
 				if (reason.stack) e.stack = String(reason.stack).slice(0, 32000);
+			} else {
+				// A rejection whose reason isn't an Error carries no stack and no
+				// meaningful type. In practice most are injected third-party
+				// scripts (email/link scanners, browser extensions) rejecting a
+				// plain value, not a real app fault — so report it as a warning
+				// rather than a first-class error/issue. Still visible for
+				// debugging; `beforeSend` can drop it entirely.
+				e.severity = "warning";
 			}
 			enqueue(e, true);
 		},