@langgraph-js/sdk/dist/server/utils.js

The UI SDK for LangGraph - seamlessly integrate your AI agents with frontend interfaces

import { isHumanMessage } from "@langchain/core/messages";
export const getTextMessageContent = (message) => {
    if (typeof message.content === "string") {
        return message.content;
    }
    else {
        return message.content
            .filter((i) => i.type === "text")
            .map((i) => i.text)
            .join("\n");
    }
};
export function getLastHumanMessage(messages) {
    // 从后往前遍历消息列表
    for (let i = messages.length - 1; i >= 0; i--) {
        const message = messages[i];
        // 检查消息是否是 HumanMessage 的实例
        if (isHumanMessage(message)) {
            return message;
        }
    }
    // 如果没有找到 HumanMessage，则返回 undefined
    return undefined;
}