fix(terminal): preserve UTF-8 replay chunks (#1181)

* fix(terminal): preserve UTF-8 replay chunks * fix(terminal): avoid replay trim prepends --------- Co-authored-by: Isaac Sanchez <isanchez-hawkins@arize.com>
2026-05-12 11:05:03 +03:00
parent 2a9c7e6bca
commit 323347f50e
2 changed files with 23 additions and 2 deletions
@@ -10,8 +10,20 @@ const trimTerminalOutputChunkToMaxBytes = (data, maxBytes) => {
    return data;
  }

-  const trimmedBuffer = Buffer.from(data, 'utf8').subarray(-maxBytes);
-  return trimmedBuffer.toString('utf8');
+  const kept = [];
+  let trimmedBytes = 0;
+  const characters = Array.from(data);
+  for (let index = characters.length - 1; index >= 0; index -= 1) {
+    const character = characters[index];
+    const characterBytes = Buffer.byteLength(character, 'utf8');
+    if (trimmedBytes + characterBytes > maxBytes) {
+      break;
+    }
+    kept.push(character);
+    trimmedBytes += characterBytes;
+  }
+
+  return kept.reverse().join('');
 };

 export const createTerminalOutputReplayBuffer = () => ({