From 87003489f166bbd1ac4ae74a973476057659a112 Mon Sep 17 00:00:00 2001
From: Matt Brophy <matt@brophy.org>
Date: Wed, 18 Jan 2023 09:45:38 -0500
Subject: [PATCH] Remove instanceof check from isRouteErrorResponse

---
 .changeset/silver-snails-destroy.md |  5 +++++
 packages/router/utils.ts            | 12 +++++++++---
 2 files changed, 14 insertions(+), 3 deletions(-)
 create mode 100644 .changeset/silver-snails-destroy.md

diff --git a/.changeset/silver-snails-destroy.md b/.changeset/silver-snails-destroy.md
new file mode 100644
index 0000000000..85b4e8347a
--- /dev/null
+++ b/.changeset/silver-snails-destroy.md
@@ -0,0 +1,5 @@
+---
+"@remix-run/router": patch
+---
+
+Remove instanceof check from isRouteErrorResponse to avoid bundling issues on the server
diff --git a/packages/router/utils.ts b/packages/router/utils.ts
index 1a01048c3a..8506e709a1 100644
--- a/packages/router/utils.ts
+++ b/packages/router/utils.ts
@@ -1395,8 +1395,14 @@ export class ErrorResponse {
 
 /**
  * Check if the given error is an ErrorResponse generated from a 4xx/5xx
- * Response throw from an action/loader
+ * Response thrown from an action/loader
  */
-export function isRouteErrorResponse(e: any): e is ErrorResponse {
-  return e instanceof ErrorResponse;
+export function isRouteErrorResponse(error: any): error is ErrorResponse {
+  return (
+    error != null &&
+    typeof error.status === "number" &&
+    typeof error.statusText === "string" &&
+    typeof error.internal === "boolean" &&
+    "data" in error
+  );
 }