79 lines
3.0 KiB
TypeScript
79 lines
3.0 KiB
TypeScript
import { 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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import { jsonToZod } from 'json-to-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: 'Example JSON',
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name: 'exampleJson',
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type: 'string',
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description: 'Example JSON structure for LLM to return',
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rows: 10,
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default: '{"answer": "the answer", "followupQuestions": ["question1", "question2"]}',
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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 exampleJson = nodeData.inputs?.exampleJson as string
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const autoFix = nodeData.inputs?.autofixParser as boolean
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const jsonToZodString = jsonToZod(JSON.parse(exampleJson))
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const splitString = jsonToZodString.split('const schema = ')
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const schemaString = splitString[1].trim()
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const fnString = `function proxyFn(z){ return ${schemaString} }`
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const zodSchemaFunction = new Function('z', `return ${schemaString}`)
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const zodSchema = zodSchemaFunction(z)
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try {
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const structuredOutputParser = LangchainStructuredOutputParser.fromZodSchema(zodSchema)
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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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