mithril-authapp.js

// The profile model
var profile = require('./profile').get()

profile.then(function() {
  AppRouter()
}, function() {
  LoginRouter()
})

function AppRouter() {
  document.body.id = 'authenticated'
  m.route(document.body, '/', {
    '/': YourAppComponent
  })
}

function LoginRouter() {
  document.body.id = 'login'
  m.route(document.body, '/', {
    '/': YourLoginComponent
  })
}