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https://github.com/langchain-ai/langgraph.git
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74c8589045
Added a js-example to show it builds Adapted integration tests after removing the test CLI command --------- Co-authored-by: Nuno Campos <nuno@langchain.dev>
60 lines
2.5 KiB
TypeScript
60 lines
2.5 KiB
TypeScript
import { BaseMessage, BaseMessageLike } from "@langchain/core/messages";
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import { Annotation, messagesStateReducer } from "@langchain/langgraph";
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/**
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* A graph's StateAnnotation defines three main things:
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* 1. The structure of the data to be passed between nodes (which "channels" to read from/write to and their types)
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* 2. Default values for each field
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* 3. Reducers for the state's. Reducers are functions that determine how to apply updates to the state.
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* See [Reducers](https://langchain-ai.github.io/langgraphjs/concepts/low_level/#reducers) for more information.
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*/
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// This is the primary state of your agent, where you can store any information
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export const StateAnnotation = Annotation.Root({
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/**
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* Messages track the primary execution state of the agent.
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*
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* Typically accumulates a pattern of:
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*
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* 1. HumanMessage - user input
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* 2. AIMessage with .tool_calls - agent picking tool(s) to use to collect
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* information
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* 3. ToolMessage(s) - the responses (or errors) from the executed tools
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*
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* (... repeat steps 2 and 3 as needed ...)
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* 4. AIMessage without .tool_calls - agent responding in unstructured
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* format to the user.
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*
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* 5. HumanMessage - user responds with the next conversational turn.
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*
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* (... repeat steps 2-5 as needed ... )
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*
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* Merges two lists of messages or message-like objects with role and content,
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* updating existing messages by ID.
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*
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* Message-like objects are automatically coerced by `messagesStateReducer` into
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* LangChain message classes. If a message does not have a given id,
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* LangGraph will automatically assign one.
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*
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* By default, this ensures the state is "append-only", unless the
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* new message has the same ID as an existing message.
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*
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* Returns:
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* A new list of messages with the messages from \`right\` merged into \`left\`.
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* If a message in \`right\` has the same ID as a message in \`left\`, the
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* message from \`right\` will replace the message from \`left\`.`
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*/
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messages: Annotation<BaseMessage[], BaseMessageLike[]>({
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reducer: messagesStateReducer,
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default: () => [],
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}),
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/**
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* Feel free to add additional attributes to your state as needed.
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* Common examples include retrieved documents, extracted entities, API connections, etc.
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*
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* For simple fields whose value should be overwritten by the return value of a node,
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* you don't need to define a reducer or default.
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*/
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// additionalField: Annotation<string>,
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});
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