- update LangchainJS version

- add types & interfaces

- small ui bug fix

- update marketplace files

packages/components/nodes/chains/ConversationalRetrievalQAChain/ConversationalRetrievalQAChain.ts

@@ -1,5 +1,8 @@
 import { ICommonObject, IMessage, INode, INodeData, INodeParams } from '../../../src/Interface'
 import { getBaseClasses } from '../../../src/utils'
+import { ConversationalRetrievalQAChain } from 'langchain/chains'
+import { BaseLLM } from 'langchain/llms/base'
+import { BaseRetriever } from 'langchain/schema'
 
 class ConversationalRetrievalQAChain_Chains implements INode {
     label: string
@@ -18,11 +21,12 @@ class ConversationalRetrievalQAChain_Chains implements INode {
         this.icon = 'chain.svg'
         this.category = 'Chains'
         this.description = 'Document QA - built on RetrievalQAChain to provide a chat history component'
+        this.baseClasses = [this.type, ...getBaseClasses(ConversationalRetrievalQAChain)]
         this.inputs = [
             {
                 label: 'LLM',
                 name: 'llm',
-                type: 'BaseLanguageModel'
+                type: 'BaseLLM'
             },
             {
                 label: 'Vector Store Retriever',
@@ -32,23 +36,16 @@ class ConversationalRetrievalQAChain_Chains implements INode {
         ]
     }
 
-    async getBaseClasses(): Promise<string[]> {
-        const { ConversationalRetrievalQAChain } = await import('langchain/chains')
-        return getBaseClasses(ConversationalRetrievalQAChain)
-    }
-
     async init(nodeData: INodeData): Promise<any> {
-        const { ConversationalRetrievalQAChain } = await import('langchain/chains')
-
-        const llm = nodeData.inputs?.llm
-        const vectorStoreRetriever = nodeData.inputs?.vectorStoreRetriever
+        const llm = nodeData.inputs?.llm as BaseLLM
+        const vectorStoreRetriever = nodeData.inputs?.vectorStoreRetriever as BaseRetriever
 
         const chain = ConversationalRetrievalQAChain.fromLLM(llm, vectorStoreRetriever)
         return chain
     }
 
     async run(nodeData: INodeData, input: string, options: ICommonObject): Promise<string> {
-        const chain = nodeData.instance
+        const chain = nodeData.instance as ConversationalRetrievalQAChain
         let chatHistory = ''
 
         if (options && options.chatHistory) {