createChain.ts•1.45 kB
/**
* Copyright (C) 2025 by Fonoster Inc (https://fonoster.com)
* http://github.com/fonoster/fonoster
*
* This file is part of Fonoster
*
* Licensed under the MIT License (the "License");
* you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* https://opensource.org/licenses/MIT
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import { BaseChatModel } from "@langchain/core/language_models/chat_models";
import { RunnableSequence } from "@langchain/core/runnables";
import { KnowledgeBase } from "../knowledge";
import { createChatHistory } from "./chatHistory";
import { createPromptTemplate } from "./createPromptTemplate";
function createChain(
model: BaseChatModel,
knowledgeBase: KnowledgeBase,
promptTemplate: ReturnType<typeof createPromptTemplate>,
chatHistory: ReturnType<typeof createChatHistory>
) {
return RunnableSequence.from([
{
input: (input) => input.text,
context: async (input) => knowledgeBase?.queryKnowledgeBase(input.text),
history: async () => chatHistory.getMessages()
},
promptTemplate,
model
]);
}
export { createChain };