import MailDev = require("maildev") var options: MailDevOptions = { silent: true, disableWeb: true, smtp: 1025, web: 1080, webUser: 'admin', webPass: 'secret' }; var maildev = new MailDev(options); var errorCallback = (error: Error): void => {}; maildev.listen(errorCallback); var eventName = 'new'; var emailCallback = (email: Object): void => {}; maildev.on(eventName, emailCallback)