import EventSource from 'eventsource'; import { ITriggerFunctions } from 'n8n-core'; import { INodeType, INodeTypeDescription, ITriggerResponse, jsonParse } from 'n8n-workflow'; export class SseTrigger implements INodeType { description: INodeTypeDescription = { displayName: 'SSE Trigger', name: 'sseTrigger', icon: 'fa:cloud-download-alt', group: ['trigger'], version: 1, description: 'Triggers the workflow when Server-Sent Events occur', eventTriggerDescription: '', activationMessage: 'You can now make calls to your SSE URL to trigger executions.', defaults: { name: 'SSE Trigger', color: '#225577', }, inputs: [], outputs: ['main'], properties: [ { displayName: 'URL', name: 'url', type: 'string', default: '', placeholder: 'http://example.com', description: 'The URL to receive the SSE from', required: true, }, ], }; async trigger(this: ITriggerFunctions): Promise { const url = this.getNodeParameter('url') as string; const eventSource = new EventSource(url); eventSource.onmessage = (event) => { const eventData = jsonParse(event.data, { errorMessage: 'Invalid JSON for event data' }); this.emit([this.helpers.returnJsonArray([eventData])]); }; async function closeFunction() { eventSource.close(); } return { closeFunction, }; } }