Initial push

packages/components/nodes/chains/LLMChain/LLMChain.ts

@@ -0,0 +1,61 @@
+import { INode, INodeData, INodeParams } from '../../../src/Interface'
+import { getBaseClasses } from '../../../src/utils'
+
+class LLMChain_Chains implements INode {
+    label: string
+    name: string
+    type: string
+    icon: string
+    category: string
+    baseClasses: string[]
+    description: string
+    inputs: INodeParams[]
+
+    constructor() {
+        this.label = 'LLM Chain'
+        this.name = 'llmChain'
+        this.type = 'LLMChain'
+        this.icon = 'chain.svg'
+        this.category = 'Chains'
+        this.description = 'Chain to run queries against LLMs'
+        this.inputs = [
+            {
+                label: 'LLM',
+                name: 'llm',
+                type: 'BaseLanguageModel'
+            },
+            {
+                label: 'Prompt',
+                name: 'prompt',
+                type: 'BasePromptTemplate'
+            }
+        ]
+    }
+
+    async getBaseClasses(): Promise<string[]> {
+        const { LLMChain } = await import('langchain/chains')
+        return getBaseClasses(LLMChain)
+    }
+
+    async init(nodeData: INodeData): Promise<any> {
+        const { LLMChain } = await import('langchain/chains')
+
+        const llm = nodeData.inputs?.llm
+        const prompt = nodeData.inputs?.prompt
+
+        const chain = new LLMChain({ llm, prompt })
+        return chain
+    }
+
+    async run(nodeData: INodeData, input: string): Promise<string> {
+        const prompt = nodeData.instance.prompt.inputVariables // ["product"]
+        if (prompt.length > 1) throw new Error('Prompt can only contains 1 literal string {}. Multiples are found')
+
+        const chain = nodeData.instance
+        const res = await chain.run(input)
+
+        return res
+    }
+}
+
+module.exports = { nodeClass: LLMChain_Chains }