old_contents: import React from 'react'
  import { IndexRoute, IndexRedirect, Route, Redirect } from 'react-router'
  
  import BaseContainer from 'general/BaseContainer'
  
  import App from '../components/App/App'
  import DashboardView from '../components/Dashboard/DashboardView'
  
  import AuthenticationView from '../components/Authentication/AuthenticationView'
  import FirebaseAuthenticationUI from '../components/Authentication/FirebaseAuthenticationUI'
  import VerifyEmailMessage from '../components/Authentication/VerifyEmailMessage'
  import EnterUsernameForm from '../components/Authentication/EnterUsernameForm'
  import SettingsComponent from '../components/Settings/SettingsComponent'
  import BackgroundSettingsView from '../components/Settings/Background/BackgroundSettingsView'
  import WidgetsSettingsView from '../components/Settings/Widgets/WidgetsSettingsView'
  import Profile from '../components/Settings/ProfileComponent'
  import ProfileStatsView from '../components/Settings/Profile/ProfileStatsView'
  import ProfileDonateHearts from '../components/Settings/Profile/ProfileDonateHeartsView'
  import ProfileInviteFriend from '../components/Settings/Profile/ProfileInviteFriendView'
  
  export default (
    <Route path='/' component={BaseContainer}>
      <Route path='tab' component={App}>
        <IndexRoute component={DashboardView} />
        <Route path='settings' component={SettingsComponent}>
          <IndexRoute component={WidgetsSettingsView} />
          <Route path='widgets' component={WidgetsSettingsView} />
          <Route path='background' component={BackgroundSettingsView} />
        </Route>
        <Route path='profile' component={Profile}>
          <IndexRoute component={ProfileStatsView} />
          <Route path='stats' component={ProfileStatsView} />
          <Route path='donate' component={ProfileDonateHearts} />
          <Route path='invite' component={ProfileInviteFriend} />
        </Route>
        <Route path='auth' component={AuthenticationView}>
          <IndexRoute component={FirebaseAuthenticationUI} />
          <Route path='action' component={FirebaseAuthenticationUI} />
          <Route path='verify-email' component={VerifyEmailMessage} />
          <Route path='username' component={EnterUsernameForm} />
        </Route>
        <Redirect from='*' to='/tab/' />
      </Route>
      <IndexRedirect from='*' to='/tab/' />
    </Route>
  )
  
new_contents: import React from 'react'
  import { IndexRoute, IndexRedirect, Route, Redirect } from 'react-router'
  
  import BaseContainer from 'general/BaseContainer'
  
  import App from '../components/App/App'
  import DashboardView from '../components/Dashboard/DashboardView'
  
  import AuthenticationView from '../components/Authentication/AuthenticationView'
  import FirebaseAuthenticationUI from '../components/Authentication/FirebaseAuthenticationUI'
  import VerifyEmailMessage from '../components/Authentication/VerifyEmailMessage'
  import EnterUsernameForm from '../components/Authentication/EnterUsernameForm'
  import SettingsComponent from '../components/Settings/SettingsComponent'
  import BackgroundSettingsView from '../components/Settings/Background/BackgroundSettingsView'
  import WidgetsSettingsView from '../components/Settings/Widgets/WidgetsSettingsView'
  import Profile from '../components/Settings/ProfileComponent'
  import ProfileStatsView from '../components/Settings/Profile/ProfileStatsView'
  import ProfileDonateHearts from '../components/Settings/Profile/ProfileDonateHeartsView'
  import ProfileInviteFriend from '../components/Settings/Profile/ProfileInviteFriendView'
  
  export default (
    // TODO: Show 404 page from IndexRedirect
    <Route path='/' component={BaseContainer}>
      <Route path='tab' component={App}>
        <IndexRoute component={DashboardView} />
        <Route path='settings' component={SettingsComponent}>
          <IndexRoute component={WidgetsSettingsView} />
          <Route path='widgets' component={WidgetsSettingsView} />
          <Route path='background' component={BackgroundSettingsView} />
        </Route>
        <Route path='profile' component={Profile}>
          <IndexRoute component={ProfileStatsView} />
          <Route path='stats' component={ProfileStatsView} />
          <Route path='donate' component={ProfileDonateHearts} />
          <Route path='invite' component={ProfileInviteFriend} />
        </Route>
        <Route path='auth' component={AuthenticationView}>
          <IndexRoute component={FirebaseAuthenticationUI} />
          <Route path='action' component={FirebaseAuthenticationUI} />
          <Route path='verify-email' component={VerifyEmailMessage} />
          <Route path='username' component={EnterUsernameForm} />
        </Route>
        <Redirect from='*' to='/tab/' />
      </Route>
      <IndexRedirect from='*' to='/tab/' />
    </Route>
  )
  
subject: Add TODO note.