91 lines
3.4 KiB
TypeScript
91 lines
3.4 KiB
TypeScript
import { convertSchemaToZod, getBaseClasses, INode, INodeData, INodeParams } from '../../../src'
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import { BaseOutputParser } from 'langchain/schema/output_parser'
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import { StructuredOutputParser as LangchainStructuredOutputParser } from 'langchain/output_parsers'
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import { CATEGORY } from '../OutputParserHelpers'
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import { z } from 'zod'
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class StructuredOutputParser implements INode {
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label: string
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name: string
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version: number
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description: string
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type: string
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icon: string
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category: string
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baseClasses: string[]
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inputs: INodeParams[]
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credential: INodeParams
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constructor() {
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this.label = 'Structured Output Parser'
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this.name = 'structuredOutputParser'
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this.version = 1.0
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this.type = 'StructuredOutputParser'
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this.description = 'Parse the output of an LLM call into a given (JSON) structure.'
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this.icon = 'structure.svg'
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this.category = CATEGORY
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this.baseClasses = [this.type, ...getBaseClasses(BaseOutputParser)]
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this.inputs = [
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{
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label: 'Autofix',
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name: 'autofixParser',
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type: 'boolean',
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optional: true,
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description: 'In the event that the first call fails, will make another call to the model to fix any errors.'
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},
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{
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label: 'JSON Structure',
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name: 'jsonStructure',
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type: 'datagrid',
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description: 'JSON structure for LLM to return',
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datagrid: [
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{ field: 'property', headerName: 'Property', editable: true },
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{
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field: 'type',
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headerName: 'Type',
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type: 'singleSelect',
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valueOptions: ['string', 'number', 'boolean'],
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editable: true
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},
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{ field: 'description', headerName: 'Description', editable: true, flex: 1 }
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],
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default: [
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{
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property: 'answer',
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type: 'string',
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description: `answer to the user's question`
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},
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{
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property: 'source',
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type: 'string',
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description: `sources used to answer the question, should be websites`
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}
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],
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additionalParams: true
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}
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]
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}
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async init(nodeData: INodeData): Promise<any> {
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const jsonStructure = nodeData.inputs?.jsonStructure as string
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const autoFix = nodeData.inputs?.autofixParser as boolean
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try {
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const structuredOutputParser = LangchainStructuredOutputParser.fromZodSchema(z.object(convertSchemaToZod(jsonStructure)))
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// NOTE: When we change Flowise to return a json response, the following has to be changed to: JsonStructuredOutputParser
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Object.defineProperty(structuredOutputParser, 'autoFix', {
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enumerable: true,
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configurable: true,
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writable: true,
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value: autoFix
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})
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return structuredOutputParser
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} catch (exception) {
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throw new Error('Invalid JSON in StructuredOutputParser: ' + exception)
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}
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}
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}
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module.exports = { nodeClass: StructuredOutputParser }
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