define(['N/email', 'N/render', 'N/record', 'N/file'], 
function(email, render, record, file) {
function sendInvoice(id, recipientId) {
// Load record
var invRec = record.load({type: record.Type.INVOICE, id: id});

// Render PDF
var pdfFile = render.transaction({entityId: id, printMode: render.PrintMode.PDF});

// Send Email
email.send({
author: -5, // -5 = system user
recipients: recipientId,
subject: 'Invoice ' + invRec.getValue('tranid'),
body: 'Please find attached invoice.',
attachments: [pdfFile]
});
}
return {execute: sendInvoice};
});