Function lastIndexOfRole

packages/llm/src/cache-policy.ts:61–62

(messages: ReadonlyArray<Message>, role: Message["role"])

}

const lastIndexOfRole = (messages: ReadonlyArray<Message>, role: Message["role"]): number =>
  messages.findLastIndex((m) => m.role === role)

// Mark the last text part of `messages[index]`. If no text part exists, mark
// the last content part regardless of type — that's the breakpoint position