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import express from 'express'
import routes from './routes';
import { render, build } from 'react-universal-starter';

const app = express();

const handler = build(async (req, res, stats) => {

  try {
    const html = await render(routes, stats);

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Rudy Prefetching + Code-Splitting Strategy

We're gonna start by looking at how code splitting works, and build our understanding of the task from there

The Big Picture problem we solve

CODE SPLIT EVERYTHING (NOT JUST COMPONENTS) -- AND DO IT BEFORE YOU NEED IT

The big hidden idea here is that with RUC it's challenging, not perfectly performant, and non-obvious how to code split non-component things like reducers, thunks, etc.

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// implementation  1

const load = (api) => async (req, next) => {
    const { route, action } = req
    const hasLoad = route && route.load

    if (!hasLoad) return next()

    const { components, reducers, chunks, ...res } = await route.load(req) || {}

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How we assign components to modules

This insures each component only can access the state from the module its part of.

1. here's the intermediary data structure we generate in a single babel pass:

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Our Manifest

Below is our manifest which has the information of every route the app has. It's statically generated by our babel-plugin at compile time.

It has the absolute minimal amount of information necessary so that it's possible for any route to dispatch actions to any other route.

Since createScene() generates action creators from simply our routesMap types/keys, that's all we need to generate ALL ACTIONS. Well, there is a few small edge cases, but you got the idea.

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Respond Framework Walkthrough

Respond Framework is what happens if you build Redux & first-class concerns for routing into React, plus take a page from the traditional server-side MVC playbook when it comes to side-effects.

Here's a quick overview of the features and usage in Respond Framework.

Installation

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import { testGenerator } from 'respond-framework/test'

const routes = {
  LOGIN: '/login',
  SIGNUP: '/signup',
  POST: '/post/:slug',
  HOME: {
    path: '/',
    next: {
      LOGIN: request => !!request.getState().cookies.existingUser,

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export default createApp({
  components: {
    App: (props, { location }) => {
      const Component = location.components.list.ComponentWithHoistedDataDeps
      return Component ? <Component /> : <Spinner />
    },
  },
  routes: {
    LIST: {
      path: '/list/:category',

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const MyRespondModal = (props, state, actions) => (
  <Modal
    visible={!!state.modalText}
    text={state.modalText}
    onClose={actions.cancel}
    onSubmit={actions.confirm}
  />
)

const Modal = ({ visible, text, onClose, onSubmit }) => {

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import { Box } from 'respond'

export function Items(props) {
  return Box({
    style: { margin: 20, padding: 10 }, 
    children: [
      Item({ name: 'svelte' }),
      Item({ name: 'react' }),
      Item({ name: 'vue' }),
    ],