Update Chat Model Serialization

[vowelparrot]

Unify format with the python lib, which was defined of yore as

def _message_to_dict(message: BaseMessage) -> dict:
    return {"type": message.type, "data": message.dict()}


def messages_to_dict(messages: List[BaseMessage]) -> List[dict]:
    return [_message_to_dict(m) for m in messages]


def _message_from_dict(message: dict) -> BaseMessage:
    _type = message["type"]
    if _type == "human":
        return HumanMessage(**message["data"])
    elif _type == "ai":
        return AIMessage(**message["data"])
    elif _type == "system":
        return SystemMessage(**message["data"])
    elif _type == "chat":
        return ChatMessage(**message["data"])
    else:
        raise ValueError(f"Got unexpected type: {_type}")


def messages_from_dict(messages: List[dict]) -> List[BaseMessage]:
    return [_message_from_dict(m) for m in messages]

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Name	Status	Preview	Updated (UTC)
langchainjs-docs	✅ Ready (Inspect)	Visit Preview	May 12, 2023 10:41pm

[jacoblee93]

I do feel like I'd rather shim this, mark it, then remove the shim when 1.0.0 comes out as a breaking change - I know all this is recent but have seen a few people using it already.

[vowelparrot]

@jacoblee93 thoughts on the mapV1MessageToStoredMessage ?

[jacoblee93]

I'm for it! Just would add a comment saying to remove when ready to make a breaking change so we don't forget about it

[jacoblee93]

Camel case to match JS variable name style

[jacoblee93]

Might be some weird edge case where message has the data property set but is undefined - the more idiomatic way to do this in TS is (weirdly):

if (message.data !== undefined) {
}

[vowelparrot]

Cool thank you!