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packages/@n8n/nodes-langchain/nodes/llms/LMLemonade/LmLemonade.node.ts

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+import { OpenAI } from '@langchain/openai';
+import {
+	NodeConnectionTypes,
+	type INodeType,
+	type INodeTypeDescription,
+	type ISupplyDataFunctions,
+	type SupplyData,
+} from 'n8n-workflow';
+
+import type { LemonadeApiCredentialsType } from '../../../credentials/LemonadeApi.credentials';
+
+import { lemonadeDescription, lemonadeModel, lemonadeOptions } from './description';
+import {
+	makeN8nLlmFailedAttemptHandler,
+	N8nLlmTracing,
+	getConnectionHintNoticeField,
+} from '@n8n/ai-utilities';
+
+export class LmLemonade implements INodeType {
+	description: INodeTypeDescription = {
+		displayName: 'Lemonade Model',
+
+		name: 'lmLemonade',
+		icon: 'file:lemonade.svg',
+		group: ['transform'],
+		version: 1,
+		description: 'Language Model Lemonade',
+		defaults: {
+			name: 'Lemonade Model',
+		},
+		codex: {
+			categories: ['AI'],
+			subcategories: {
+				AI: ['Language Models', 'Root Nodes'],
+				'Language Models': ['Text Completion Models'],
+			},
+			resources: {
+				primaryDocumentation: [
+					{
+						url: 'https://docs.n8n.io/integrations/builtin/cluster-nodes/sub-nodes/n8n-nodes-langchain.lmlemonade/',
+					},
+				],
+			},
+		},
+
+		inputs: [],
+
+		outputs: [NodeConnectionTypes.AiLanguageModel],
+		outputNames: ['Model'],
+		...lemonadeDescription,
+		properties: [
+			getConnectionHintNoticeField([NodeConnectionTypes.AiChain, NodeConnectionTypes.AiAgent]),
+			lemonadeModel,
+			lemonadeOptions,
+		],
+	};
+
+	async supplyData(this: ISupplyDataFunctions, itemIndex: number): Promise<SupplyData> {
+		const credentials = (await this.getCredentials('lemonadeApi')) as LemonadeApiCredentialsType;
+
+		const modelName = this.getNodeParameter('model', itemIndex) as string;
+		const options = this.getNodeParameter('options', itemIndex, {}) as {
+			temperature?: number;
+			topP?: number;
+			frequencyPenalty?: number;
+			presencePenalty?: number;
+			maxTokens?: number;
+			stop?: string;
+		};
+
+		// Process stop sequences
+		let stop: string[] | undefined;
+		if (options.stop) {
+			const stopSequences = options.stop
+				.split(',')
+				.map((s) => s.trim())
+				.filter((s) => s.length > 0);
+			stop = stopSequences.length > 0 ? stopSequences : undefined;
+		}
+
+		// Ensure we have an API key for OpenAI client validation
+		const apiKey = credentials.apiKey || 'lemonade-placeholder-key';
+
+		// Build configuration object separately like official OpenAI node
+		const configuration: any = {
+			baseURL: credentials.baseUrl,
+		};
+
+		// Add custom headers if API key is provided
+		if (credentials.apiKey) {
+			configuration.defaultHeaders = {
+				Authorization: `Bearer ${credentials.apiKey}`,
+			};
+		}
+
+		const model = new OpenAI({
+			apiKey,
+			model: modelName,
+			temperature: options.temperature,
+			topP: options.topP,
+			frequencyPenalty: options.frequencyPenalty,
+			presencePenalty: options.presencePenalty,
+			maxTokens: options.maxTokens && options.maxTokens > 0 ? options.maxTokens : undefined,
+			stop,
+			configuration,
+			callbacks: [new N8nLlmTracing(this)],
+			onFailedAttempt: makeN8nLlmFailedAttemptHandler(this),
+		});
+
+		return {
+			response: model,
+		};
+	}
+}