MithrilJS base app with routes, auth and layout

app.js

var isLoggedIn = false;

m.route.prefix('')

//-- pages
var home = {
  view: () => m('p', 'Home')
}

var some = {
  view: () => [
    m('p', 'Some other page')   
  ]
}

var login = {
  view: () => m('button', {onclick: () => {
    isLoggedIn = true
    m.route.set("/")
  }}, 'Login')
}

// -- layout
var layout = {
  view: (vnode) => m('.wrapper', 
    m('nav',
      m('a[href=/]', {oncreate: m.route.link}, 'Home'),
      m('a[href=/some]', {oncreate: m.route.link}, 'Some')
    ),
    vnode.children,
    
    m('hr'),
    m('button', {onclick: () => {
        isLoggedIn = false
        m.route.set("/login")
      }}, 'Logout')     
  )
}

// -- helpers
function checkAuth() {
  if(!isLoggedIn) m.route.set("/login")
}

function baseView(page) {
  return () => {
    return m(layout, m(page))
  }  
}

function needsAuth(page) {
  return {
		onmatch: checkAuth,
		render: page   
  }  
}

// -- router
const routes = {
  '/': needsAuth(baseView(home)),  
  '/some': needsAuth(baseView(some)),
  '/login'  : login
}

// -- mount it
m.route(document.body, '/', routes)