feat(Merge Node): Overhaul, v3 (#9528)

Co-authored-by: Jan Oberhauser <jan.oberhauser@gmail.com>
Co-authored-by: Shireen Missi <94372015+ShireenMissi@users.noreply.github.com>

packages/nodes-base/nodes/Merge/v3/actions/router.ts

@@ -0,0 +1,22 @@
+import { NodeExecutionOutput, type IExecuteFunctions } from 'n8n-workflow';
+import type { MergeType } from './node.type';
+import * as mode from './mode';
+import { getNodeInputsData } from '../helpers/utils';
+
+export async function router(this: IExecuteFunctions) {
+	const inputsData = getNodeInputsData.call(this);
+	let operationMode = this.getNodeParameter('mode', 0) as string;
+
+	if (operationMode === 'combine') {
+		const combineBy = this.getNodeParameter('combineBy', 0) as string;
+		operationMode = combineBy;
+	}
+
+	const returnData = await mode[operationMode as MergeType].execute.call(this, inputsData);
+
+	if (returnData instanceof NodeExecutionOutput) {
+		return returnData;
+	} else {
+		return [returnData];
+	}
+}