Function isLastMessageReasoning

frontend/src/components/chat/chat-utils.ts:58–80

(messages: UIMessage[])

}

export function isLastMessageReasoning(messages: UIMessage[]): boolean {
  if (messages.length === 0) {
    return false;
  }

  const lastMessage = messages.at(-1);
  if (!lastMessage) {
    return false;
  }

  if (lastMessage.role !== "assistant" || !lastMessage.parts) {
    return false;
  }

  const parts = lastMessage.parts;
  if (parts.length === 0) {
    return false;
  }

  // Check if the last part is reasoning
  const lastPart = parts[parts.length - 1];
  return lastPart.type === "reasoning";
}

function stringifyTextParts(parts: UIMessage["parts"]): string {
  return parts