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packages/nodes-base/nodes/ErrorTrigger/ErrorTrigger.node.ts

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+import type {
+	IExecuteFunctions,
+	INodeExecutionData,
+	INodeType,
+	INodeTypeDescription,
+	ITriggerFunctions,
+	ITriggerResponse,
+} from 'n8n-workflow';
+import { NodeConnectionTypes } from 'n8n-workflow';
+
+export class ErrorTrigger implements INodeType {
+	description: INodeTypeDescription = {
+		displayName: 'Error Trigger',
+		name: 'errorTrigger',
+		icon: 'fa:bug',
+		iconColor: 'blue',
+		group: ['trigger'],
+		version: 1,
+		description: 'Triggers the workflow when another workflow has an error',
+		eventTriggerDescription: '',
+		mockManualExecution: true,
+		maxNodes: 1,
+		defaults: {
+			name: 'Error Trigger',
+			color: '#0000FF',
+		},
+		inputs: [],
+		outputs: [NodeConnectionTypes.Main],
+		properties: [
+			{
+				displayName:
+					'This node will trigger when there is an error in another workflow, as long as that workflow is set up to do so. <a href="https://docs.n8n.io/integrations/core-nodes/n8n-nodes-base.errortrigger" target="_blank">More info</a>',
+				name: 'notice',
+				type: 'notice',
+				default: '',
+			},
+		],
+	};
+
+	async trigger(this: ITriggerFunctions): Promise<ITriggerResponse> {
+		// ErrorTrigger is triggered by n8n's error handling system
+		// No setup or teardown is required, as the triggering is handled externally
+		return {};
+	}
+
+	async execute(this: IExecuteFunctions): Promise<INodeExecutionData[][]> {
+		const items = this.getInputData();
+
+		const mode = this.getMode();
+
+		if (
+			mode === 'manual' &&
+			items.length === 1 &&
+			Object.keys(items[0].json).length === 0 &&
+			items[0].binary === undefined
+		) {
+			// If we are in manual mode and no input data got provided we return
+			// example data to allow to develope and test errorWorkflows easily
+
+			const restApiUrl = this.getRestApiUrl();
+
+			const urlParts = restApiUrl.split('/');
+			urlParts.pop();
+			urlParts.push('execution');
+
+			const id = 231;
+
+			items[0].json = {
+				execution: {
+					id,
+					url: `${urlParts.join('/')}/workflow/1/${id}`,
+					retryOf: '34',
+					error: {
+						message: 'Example Error Message',
+						stack: 'Stacktrace',
+					},
+					lastNodeExecuted: 'Node With Error',
+					mode: 'manual',
+				},
+				workflow: {
+					id: '1',
+					name: 'Example Workflow',
+				},
+			};
+		}
+
+		return [items];
+	}
+}