const emailServer = emailjs.server.connect({
  user: "myemail@gmail.com",
  password: "mypassword",
  host: "smtp.gmail.com",
  port: 465,
  ssl: true
});

➜  MyApp git:(master) firebase functions:config:get
{
  "gmail": {
    "email": "myemail@gmail.com",
    "password": "mypassword"
  }
}