first commit

packages/@n8n/nodes-langchain/utils/output_parsers/N8nOutputParser.ts

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+import type { IExecuteFunctions, ISupplyDataFunctions, IWebhookFunctions } from 'n8n-workflow';
+import { NodeConnectionTypes } from 'n8n-workflow';
+
+import { N8nItemListOutputParser } from './N8nItemListOutputParser';
+import { N8nOutputFixingParser } from './N8nOutputFixingParser';
+import { N8nStructuredOutputParser } from './N8nStructuredOutputParser';
+
+export type N8nOutputParser =
+	| N8nOutputFixingParser
+	| N8nStructuredOutputParser
+	| N8nItemListOutputParser;
+
+export { N8nOutputFixingParser, N8nItemListOutputParser, N8nStructuredOutputParser };
+
+export async function getOptionalOutputParser(
+	ctx: IExecuteFunctions | ISupplyDataFunctions | IWebhookFunctions,
+	index: number = 0,
+): Promise<N8nOutputParser | undefined> {
+	let outputParser: N8nOutputParser | undefined;
+
+	if (ctx.getNodeParameter('hasOutputParser', 0, true) === true) {
+		outputParser = (await ctx.getInputConnectionData(
+			NodeConnectionTypes.AiOutputParser,
+			index,
+		)) as N8nOutputParser;
+	}
+
+	return outputParser;
+}