fix(editor): Group output panel warnings to keep it usable (#36619)

packages/nodes-base/nodes/Transform/Aggregate/Aggregate.node.ts

@@ -14,7 +14,7 @@ import {
 } from 'n8n-workflow';
 
 import { addBinariesToItem } from './utils';
-import { prepareFieldsArray } from '../utils/utils';
+import { fieldNotFoundHint, prepareFieldsArray } from '../utils/utils';
 
 export class Aggregate implements INodeType {
 	description: INodeTypeDescription = {
@@ -439,10 +439,7 @@ export class Aggregate implements INodeType {
 
 			for (const [field, values] of Object.entries(notFoundedFields)) {
 				if (values.every((value) => !value)) {
-					hints.push({
-						message: `The field '${field}' wasn't found in any input item`,
-						location: 'outputPane',
-					});
+					hints.push(fieldNotFoundHint(field));
 				}
 			}
 

packages/nodes-base/nodes/Transform/SplitOut/test/utils.test.ts

@@ -54,6 +54,11 @@ describe('FieldsTracker', () => {
 				{
 					message: "The field 'missingField' wasn't found in any input item",
 					location: 'outputPane',
+					group: {
+						key: 'fieldNotFound',
+						summary: "{count} fields weren't found in your input items",
+						label: 'missingField',
+					},
 				},
 			]);
 		});

packages/nodes-base/nodes/Transform/SplitOut/utils.ts

@@ -1,5 +1,7 @@
 import type { NodeExecutionHint } from 'n8n-workflow';
 
+import { fieldNotFoundHint } from '../utils/utils';
+
 export class FieldsTracker {
 	fields: { [key: string]: boolean } = {};
 
@@ -20,10 +22,7 @@ export class FieldsTracker {
 
 		for (const [field, value] of Object.entries(this.fields)) {
 			if (!value) {
-				hints.push({
-					message: `The field '${field}' wasn't found in any input item`,
-					location: 'outputPane',
-				});
+				hints.push(fieldNotFoundHint(field));
 			}
 		}
 

packages/nodes-base/nodes/Transform/utils/utils.ts

@@ -1,5 +1,20 @@
+import type { NodeExecutionHint } from 'n8n-workflow';
 import { UserError } from 'n8n-workflow';
 
+/**
+ * Nodes that take a list of field names report one hint per field they couldn't
+ * find. Use the same group key so the UI can collapse them under one summary.
+ */
+export const fieldNotFoundHint = (field: string): NodeExecutionHint => ({
+	message: `The field '${field}' wasn't found in any input item`,
+	location: 'outputPane',
+	group: {
+		key: 'fieldNotFound',
+		summary: "{count} fields weren't found in your input items",
+		label: field,
+	},
+});
+
 export const prepareFieldsArray = (fields: string | string[], fieldName = 'Fields') => {
 	if (typeof fields === 'string') {
 		return fields