fix(telegram): add UND_ERR_CONNECT_TIMEOUT to PRE_CONNECT_ERROR_CODES

lzw112 · lzw112 · commit b8e2dbaeb0d5 · 2026-07-07T10:50:26.000+08:00
UND_ERR_CONNECT_TIMEOUT occurs during TCP/TLS connect handshake,
before any HTTP request data is sent. Adding it to the pre-connect
set allows isSafeToRetrySendError to safely retry sendMessage when
undici's connect timeout fires — the message was never transmitted.
diff --git a/extensions/telegram/src/network-errors.test.ts b/extensions/telegram/src/network-errors.test.ts
@@ -239,7 +239,7 @@ describe("isSafeToRetrySendError", () => {
     ["ECONNRESET", "read ECONNRESET", false],
     ["ETIMEDOUT", "connect ETIMEDOUT", false],
     ["EPIPE", "write EPIPE", false],
-    ["UND_ERR_CONNECT_TIMEOUT", "connect timeout", false],
+    ["UND_ERR_CONNECT_TIMEOUT", "connect timeout", true],
   ])("returns %s => %s", (code, message, expected) => {
     expect(isSafeToRetrySendError(errorWithCode(message, code))).toBe(expected);
   });
diff --git a/extensions/telegram/src/network-errors.ts b/extensions/telegram/src/network-errors.ts
@@ -47,6 +47,7 @@ const PRE_CONNECT_ERROR_CODES = new Set([
   "ENETDOWN", // Local network interface is down before connect completes (never sent)
   "ENETUNREACH", // No route to host (never sent)
   "EHOSTUNREACH", // Host unreachable (never sent)
+  "UND_ERR_CONNECT_TIMEOUT", // TCP/TLS connect timeout (request never sent)
 ]);
 
 const RECOVERABLE_ERROR_NAMES = new Set([
