#mithril Route separation logic example From https://gitter.im/lhorie/mithril.js?at=551bd24305184cd235fb971a

routes.js

// The limited unauthenticated routemap
var authRoutes = {
    '/signup' : modules.signup,
    '/login'  : modules.login
};
// The whole shebang
var appRoutes  = Object.assign( {
    '/:semantic/:app/:routes' : various.modules
}, authRoutes );

// Called on succesful login
function welcome(){
    m.startComputation();

    m.route( document.body, '/profile', appRoutes );

    // Where they were going to in the first place
    m.route( localStorage.getItem( 'entryPoint' ) );

    m.endComputation();
}

// Run on init
m.route( document.body, '/', {
    '/:path...' : {
        controller(){
            // Preserve entry point
            localStorage.setItem( 'entryPoint', m.route() );
        },
        // Wait til we've determined what's going on
        view : mod.call( undefined, modules.loading )
    }
} );

// Record of a local session
if( var profile = localStorage.getItem( 'profile' ) ){
    // Check to see if it's still ongoing server-side
    m.request( profile.profile_uri ).then(
        // Fork journey depending on outcome
        () => m.route( document.body, '/',      appRoutes  ),
        () => m.route( document.body, '/login', authRoutes )
    );
}
else {
    // Vanilla routing
    m.route( document.body, '/signup', authRoutes );
}