From 84bf1d73ea29f7616eec13a41af9683cba25da6b Mon Sep 17 00:00:00 2001
From: KimGLee <05_bolster_inkling@icloud.com>
Date: Sat, 21 Mar 2026 13:14:05 +0800
Subject: [PATCH] fix(telegram): guard file-ref extension set access for mocked
 runtimes

---
 extensions/telegram/src/format.ts | 34 ++++++++++++++++++++++---------
 1 file changed, 24 insertions(+), 10 deletions(-)

diff --git a/extensions/telegram/src/format.ts b/extensions/telegram/src/format.ts
index 4d14f179b2f..9134ed420e6 100644
--- a/extensions/telegram/src/format.ts
+++ b/extensions/telegram/src/format.ts
@@ -103,16 +103,23 @@ function escapeRegex(str: string): string {
   return str.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
 }
 
-const FILE_EXTENSIONS_PATTERN = Array.from(FILE_REF_EXTENSIONS_WITH_TLD).map(escapeRegex).join("|");
+const FILE_EXTENSIONS_PATTERN =
+  FILE_REF_EXTENSIONS_WITH_TLD && Symbol.iterator in FILE_REF_EXTENSIONS_WITH_TLD
+    ? Array.from(FILE_REF_EXTENSIONS_WITH_TLD).map(escapeRegex).join("|")
+    : "";
 const AUTO_LINKED_ANCHOR_PATTERN = /<a\s+href="https?:\/\/([^"]+)"[^>]*>\1<\/a>/gi;
-const FILE_REFERENCE_PATTERN = new RegExp(
-  `(^|[^a-zA-Z0-9_\\-/])([a-zA-Z0-9_.\\-./]+\\.(?:${FILE_EXTENSIONS_PATTERN}))(?=$|[^a-zA-Z0-9_\\-/])`,
-  "gi",
-);
-const ORPHANED_TLD_PATTERN = new RegExp(
-  `([^a-zA-Z0-9]|^)([A-Za-z]\\.(?:${FILE_EXTENSIONS_PATTERN}))(?=[^a-zA-Z0-9/]|$)`,
-  "g",
-);
+const FILE_REFERENCE_PATTERN = FILE_EXTENSIONS_PATTERN
+  ? new RegExp(
+      `(^|[^a-zA-Z0-9_\\-/])([a-zA-Z0-9_.\\-./]+\\.(?:${FILE_EXTENSIONS_PATTERN}))(?=$|[^a-zA-Z0-9_\\-/])`,
+      "gi",
+    )
+  : null;
+const ORPHANED_TLD_PATTERN = FILE_EXTENSIONS_PATTERN
+  ? new RegExp(
+      `([^a-zA-Z0-9]|^)([A-Za-z]\\.(?:${FILE_EXTENSIONS_PATTERN}))(?=[^a-zA-Z0-9/]|$)`,
+      "g",
+    )
+  : null;
 const HTML_TAG_PATTERN = /(<\/?)([a-zA-Z][a-zA-Z0-9-]*)\b[^>]*?>/gi;
 
 function wrapStandaloneFileRef(match: string, prefix: string, filename: string): string {
@@ -131,7 +138,14 @@ function wrapSegmentFileRefs(
   preDepth: number,
   anchorDepth: number,
 ): string {
-  if (!text || codeDepth > 0 || preDepth > 0 || anchorDepth > 0) {
+  if (
+    !text ||
+    !FILE_REFERENCE_PATTERN ||
+    !ORPHANED_TLD_PATTERN ||
+    codeDepth > 0 ||
+    preDepth > 0 ||
+    anchorDepth > 0
+  ) {
     return text;
   }
   const wrappedStandalone = text.replace(FILE_REFERENCE_PATTERN, wrapStandaloneFileRef);