From 902d52a640c146cada2c8d248f347533b39f19e2 Mon Sep 17 00:00:00 2001
From: robobun <robobun@users.noreply.github.com>
Date: Sun, 26 Apr 2026 09:30:14 +0000
Subject: [PATCH] Fix stack overflow when inspecting JSX elements with circular
 references

---
 src/bun.js/ConsoleObject.zig     |  2 +-
 test/js/bun/util/inspect.test.js | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/src/bun.js/ConsoleObject.zig b/src/bun.js/ConsoleObject.zig
index a1cfeb510359..c9a7361ee4c2 100644
--- a/src/bun.js/ConsoleObject.zig
+++ b/src/bun.js/ConsoleObject.zig
@@ -1136,7 +1136,7 @@ pub const Formatter = struct {
 
         pub fn canHaveCircularReferences(tag: Tag) bool {
             return switch (tag) {
-                .Function, .Array, .Object, .Map, .Set, .Error, .Class, .Event => true,
+                .Function, .Array, .Object, .Map, .Set, .Error, .Class, .Event, .JSX => true,
                 else => false,
             };
         }
diff --git a/test/js/bun/util/inspect.test.js b/test/js/bun/util/inspect.test.js
index 32a70af30183..54a43f17e818 100644
--- a/test/js/bun/util/inspect.test.js
+++ b/test/js/bun/util/inspect.test.js
@@ -316,6 +316,24 @@ it("jsx with fragment", () => {
   expect(input).toBe(output);
 });
 
+it("jsx with circular reference in key", () => {
+  const el = { $$typeof: Symbol.for("react.element"), type: "div", key: null, ref: null, props: {} };
+  el.key = el;
+  expect(Bun.inspect(el)).toContain("[Circular]");
+});
+
+it("jsx with circular reference in props", () => {
+  const el = { $$typeof: Symbol.for("react.element"), type: "div", key: null, ref: null, props: {} };
+  el.props.foo = el;
+  expect(Bun.inspect(el)).toBe("<div foo=[Circular] />");
+});
+
+it("jsx with circular reference in children", () => {
+  const el = { $$typeof: Symbol.for("react.element"), type: "div", key: null, ref: null, props: {} };
+  el.props.children = [el];
+  expect(Bun.inspect(el)).toBe("<div>\n  [Circular]\n</div>");
+});
+
 it("inspect", () => {
   expect(Bun.inspect(new TypeError("what")).includes("TypeError: what")).toBe(true);
   expect(Bun.inspect("hi")).toBe('"hi"');