Add more nodes for agents, loaders

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

@@ -0,0 +1,57 @@
+import { INode, INodeData, INodeParams } from '../../../src/Interface'
+
+class RetrievalQAChain_Chains implements INode {
+    label: string
+    name: string
+    type: string
+    icon: string
+    category: string
+    baseClasses: string[]
+    description: string
+    inputs: INodeParams[]
+
+    constructor() {
+        this.label = 'RetrievalQA Chain'
+        this.name = 'retrievalQAChain'
+        this.type = 'RetrievalQAChain'
+        this.icon = 'chain.svg'
+        this.category = 'Chains'
+        this.description = 'QA chain to answer a question based on the retrieved documents'
+        this.inputs = [
+            {
+                label: 'LLM',
+                name: 'llm',
+                type: 'BaseLanguageModel'
+            },
+            {
+                label: 'Vector Store Retriever',
+                name: 'vectorStoreRetriever',
+                type: 'BaseRetriever'
+            }
+        ]
+    }
+
+    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 chain = RetrievalQAChain.fromLLM(llm, vectorStoreRetriever)
+        return chain
+    }
+
+    async run(nodeData: INodeData, input: string): Promise<string> {
+        const chain = nodeData.instance
+        const obj = {
+            query: input
+        }
+        const res = await chain.call(obj)
+        return res?.text
+    }
+}
+
+module.exports = { nodeClass: RetrievalQAChain_Chains }