refactor(Basic LLM Chain Node): Refactor Basic LLM Chain & add tests (#13850)

packages/@n8n/nodes-langchain/nodes/chains/ChainLLM/methods/responseFormatter.ts

@@ -0,0 +1,30 @@
+import type { IDataObject } from 'n8n-workflow';
+
+/**
+ * Formats the response from the LLM chain into a consistent structure
+ */
+export function formatResponse(response: unknown): IDataObject {
+	if (typeof response === 'string') {
+		return {
+			response: {
+				text: response.trim(),
+			},
+		};
+	}
+
+	if (Array.isArray(response)) {
+		return {
+			data: response,
+		};
+	}
+
+	if (response instanceof Object) {
+		return response as IDataObject;
+	}
+
+	return {
+		response: {
+			text: response,
+		},
+	};
+}