test.js

var Twilio = require('./index').Twilio;

var c = new Twilio();

c.api.messages.create({
  to: '+16512080532',
  from: process.env.TWILIO_NUMBER,
  body: 'hey there'
}).then(function(data) {
  console.log(data);
}).catch(function(e) {
  console.log(e);
});