fix(utils): use readUInt8 for browser Buffer polyfill compat (#8578)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Co-authored-by: devin-ai-integration[bot] <158243242+devin-ai-integration[bot]@users.noreply.github.com>

Author: 3 people

.changeset/fix-buffer-readuint8.md

@@ -0,0 +1,5 @@
+---
+'@hyperlane-xyz/utils': patch
+---
+
+Fixed `parseMessage` crash in browser environments by using `readUInt8` instead of the Node.js 16+ `readUint8` alias, which is missing from common Buffer polyfills.

typescript/utils/src/messages.ts

@@ -65,7 +65,7 @@ export function parseMessage(message: string): ParsedMessage {
   const BODY_OFFSET = 77;
 
   const buf = Buffer.from(utils.arrayify(message));
-  const version = buf.readUint8(VERSION_OFFSET);
+  const version = buf.readUInt8(VERSION_OFFSET);
   const nonce = buf.readUInt32BE(NONCE_OFFSET);
   const origin = buf.readUInt32BE(ORIGIN_OFFSET);
   const sender = utils.hexlify(buf.subarray(SENDER_OFFSET, DESTINATION_OFFSET));