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/methods/index.ts

@@ -0,0 +1 @@
+export * as loadOptions from './loadOptions';

packages/nodes-base/nodes/Merge/v3/methods/loadOptions.ts

@@ -0,0 +1,49 @@
+import type { ILoadOptionsFunctions, INodePropertyOptions } from 'n8n-workflow';
+
+export async function getResolveClashOptions(
+	this: ILoadOptionsFunctions,
+): Promise<INodePropertyOptions[]> {
+	const numberOfInputs = this.getNodeParameter('numberInputs', 2) as number;
+
+	if (numberOfInputs <= 2) {
+		return [
+			{
+				name: 'Always Add Input Number to Field Names',
+				value: 'addSuffix',
+			},
+			{
+				name: 'Prefer Input 1 Version',
+				value: 'preferInput1',
+			},
+			{
+				name: 'Prefer Input 2 Version',
+				value: 'preferLast',
+			},
+		];
+	} else {
+		return [
+			{
+				name: 'Always Add Input Number to Field Names',
+				value: 'addSuffix',
+			},
+			{
+				name: 'Use Earliest Version',
+				value: 'preferInput1',
+			},
+		];
+	}
+}
+export async function getInputs(this: ILoadOptionsFunctions): Promise<INodePropertyOptions[]> {
+	const numberOfInputs = this.getNodeParameter('numberInputs', 2) as number;
+
+	const returnData: INodePropertyOptions[] = [];
+
+	for (let i = 0; i < numberOfInputs; i++) {
+		returnData.push({
+			name: `${i + 1}`,
+			value: i + 1,
+		});
+	}
+
+	return returnData;
+}