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你试图在未提供 checkpointer 的情况下使用内置的 LangGraph 持久化。 当 StateGraph 或 entrypoint 的 compile() 方法中缺少 checkpointer 时，会发生这种情况。

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故障排除

以下内容可能有助于解决此错误： 
import { InMemorySaver, StateGraph } from "@langchain/langgraph";
const checkpointer = new InMemorySaver();

// Graph API
import { StateGraph } from "@langchain/langgraph";
const graph = new StateGraph(...).compile({ checkpointer });

// Functional API
import { entrypoint } from "@langchain/langgraph";
const workflow = entrypoint(
    { checkpointer, name: "workflow" },
    async (messages: string[]) => {
        // ...
    }
);
  • 使用 LangGraph API，这样你就无需手动实现或配置 checkpointer。API 会为你处理所有持久化基础设施。

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