fix(core): Reject empty webhookMethods in community lint rule (#29474)

packages/@n8n/eslint-plugin-community-nodes/src/rules/webhook-lifecycle-complete.test.ts

@@ -107,6 +107,11 @@ export class RegularClass {
 			code: createTriggerNode({ webhookMethods: null }),
 			errors: [{ messageId: 'missingWebhookMethods' }],
 		},
+		{
+			name: 'trigger node with empty webhookMethods object (no lifecycle groups)',
+			code: createTriggerNode({ webhookMethods: '{}' }),
+			errors: [{ messageId: 'emptyWebhookMethods' }],
+		},
 		{
 			name: 'trigger node with empty webhookMethods group (all three missing)',
 			code: createTriggerNode({

packages/@n8n/eslint-plugin-community-nodes/src/rules/webhook-lifecycle-complete.ts

@@ -56,6 +56,8 @@ export const WebhookLifecycleCompleteRule = createRule({
 		messages: {
 			missingWebhookMethods:
 				'Webhook trigger node is missing the `webhookMethods` property. Implement `checkExists`, `create`, and `delete` to register, verify, and clean up the webhook on the third-party service.',
+			emptyWebhookMethods:
+				'Webhook trigger node has an empty `webhookMethods` object. Define at least one lifecycle group with `checkExists`, `create`, and `delete` methods.',
 			missingLifecycleMethod:
 				'Webhook trigger lifecycle is incomplete. `webhookMethods.{{group}}` is missing: {{missing}}. All of `checkExists`, `create`, and `delete` must be implemented.',
 		},
@@ -91,6 +93,14 @@ export const WebhookLifecycleCompleteRule = createRule({
 					return;
 				}
 
+				if (webhookMethodsProperty.value.properties.length === 0) {
+					context.report({
+						node: webhookMethodsProperty.key,
+						messageId: 'emptyWebhookMethods',
+					});
+					return;
+				}
+
 				for (const groupProperty of webhookMethodsProperty.value.properties) {
 					if (groupProperty.type !== AST_NODE_TYPES.Property) continue;
 					if (groupProperty.value.type !== AST_NODE_TYPES.ObjectExpression) continue;