From 350f5d1e8e25cb8a70321f89535541d9a4596b68 Mon Sep 17 00:00:00 2001
From: Aalhad <aalhadxx@users.noreply.github.com>
Date: Tue, 4 Aug 2026 15:07:50 +0530
Subject: [PATCH] fix(console): prepend "Assertion failed: " prefix to assert
 messages with data

console.assert() with additional arguments was not prepending the
"Assertion failed: " prefix before the formatted arguments, unlike
Node.js and browser behavior.

Fixes #19953

Signed-off-by: Aalhad <aalhadxx@users.noreply.github.com>
---
 src/jsc/ConsoleObject.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/jsc/ConsoleObject.rs b/src/jsc/ConsoleObject.rs
index 895848fcd305..6e3d7b6114b2 100644
--- a/src/jsc/ConsoleObject.rs
+++ b/src/jsc/ConsoleObject.rs
@@ -532,6 +532,15 @@ fn message_with_type_and_level_(
         }
     }
 
+    if message_type == MessageType::Assert && print_length > 0 {
+        let text: &str = if enable_colors {
+            pfmt!("<r><red>Assertion failed<r><d>: <r>", true)
+        } else {
+            "Assertion failed: "
+        };
+        let _ = writer.write_all(text.as_bytes());
+    }
+
     if print_length > 0 {
         format2(
             level,