- update LangchainJS version

- add types & interfaces

- small ui bug fix

- update marketplace files

packages/components/nodes/chains/RetrievalQAChain/RetrievalQAChain.ts

@@ -1,4 +1,8 @@
 import { INode, INodeData, INodeParams } from '../../../src/Interface'
+import { RetrievalQAChain } from 'langchain/chains'
+import { BaseLLM } from 'langchain/llms/base'
+import { BaseRetriever } from 'langchain/schema'
+import { getBaseClasses } from '../../../src/utils'
 
 class RetrievalQAChain_Chains implements INode {
     label: string
@@ -17,11 +21,12 @@ class RetrievalQAChain_Chains implements INode {
         this.icon = 'chain.svg'
         this.category = 'Chains'
         this.description = 'QA chain to answer a question based on the retrieved documents'
+        this.baseClasses = [this.type, ...getBaseClasses(RetrievalQAChain)]
         this.inputs = [
             {
                 label: 'LLM',
                 name: 'llm',
-                type: 'BaseLanguageModel'
+                type: 'BaseLLM'
             },
             {
                 label: 'Vector Store Retriever',
@@ -31,21 +36,16 @@ class RetrievalQAChain_Chains implements INode {
         ]
     }
 
-    async getBaseClasses(): Promise<string[]> {
-        return ['BaseChain']
-    }
-
     async init(nodeData: INodeData): Promise<any> {
-        const { RetrievalQAChain } = 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 = RetrievalQAChain.fromLLM(llm, vectorStoreRetriever)
         return chain
     }
 
     async run(nodeData: INodeData, input: string): Promise<string> {
-        const chain = nodeData.instance
+        const chain = nodeData.instance as RetrievalQAChain
         const obj = {
             query: input
         }