Feature: SSR + Code Splitting 🚀 (#43)

* multi: Prepare for code splitting

chore: Add react-loadable to dependencies
chore: Move babel options to package.json so they can be retrieved more easily in webpack config
chore: Remove webpack patch (https://github.com/gaearon/react-hot-loader/tree/next\#no-patch-required)
chore: Update dependencies, move appropriate to devDependencies

* feat: split up todos into separate components

* chore: move templates to server folder instead

* feat: SSR + code splitting 🚀

- Add support for import() syntax in babel and use only on the server
(it is already supported on the client with webpack 2)
- Update webpack config for import() code splitting
- Fix an issue with static fetching for server data

* chore: update readme/comments

Author: calvinl

.babelrc

@@ -6,13 +6,13 @@ APPLICATION_PORT=3000
 APPLICATION_BASE_URL=http://localhost:3000
 
 # The output path of server and client files built by webpack and babel.
-OUTPUT_PATH=/dist
-PUBLIC_OUTPUT_PATH=/dist/public
+OUTPUT_PATH=dist
+PUBLIC_OUTPUT_PATH=dist/public
 
 # Settings for webpack-dev-server.
 DEV_SERVER_PORT=3001
 DEV_SERVER_HOSTNAME=localhost
 DEV_SERVER_HOST_URL=http://localhost:3001
 
 # The primary asset path. Can be changed to be a CDN URL.
-PUBLIC_ASSET_PATH=/assets
+PUBLIC_ASSET_PATH=http://localhost:3001/assets/

.env.example

@@ -7,3 +7,5 @@ npm-debug.log*
 # ignore built static files
 /dist
 /webpack-assets.json
+/webpack-stats.json
+/react-loadable.json

.gitignore

@@ -4,11 +4,12 @@ A universal React/Redux boilerplate with sensible defaults. Out of the box, this
 boilerplate comes with:
 
 - Server-side rendering with Express
+- Code splitting with Webpack's dynamic `import()`s and [react-loadable](https://github.com/thejameskyle/react-loadable)
 - Sane [webpack configurations](webpack/)
 - JS hot reloading with `react-hot-loader` and `webpack-dev-server`
 - CSS, SASS and `css-modules` support with hot reloading and no [flash of unstyled content](https://en.wikipedia.org/wiki/Flash_of_unstyled_content) (`css-hot-loader`)
 - Routing with `react-router-v4`
-- Full production builds that do not rely on `babel`.
+- Full production builds that do not rely on `babel-node`.
 
 ## Get started
 
@@ -161,13 +162,19 @@ Check the `.eslintignore` file for directories excluded from linting.
 
 ## Changing the public asset path
 
-By default, assets are built into `/dist/public`. This path is then served by
-express under the path `/assets`. This is the public asset path. In a production
+By default, assets are built into `dist/public`. This path is then served by
+express under the path `assets`. This is the public asset path. In a production
 scenario, you may want your assets to be hosted on a CDN. To do so, just change
 the `PUBLIC_ASSET_PATH` environment variant.
 
-If you're using Heroku:
+Example using Heroku, if serving via CDN:
 
 ```
 heroku config:set PUBLIC_ASSET_PATH=https://my.cdn.com
 ```
+
+Example using Heroku, if serving locally:
+
+```
+heroku config:set PUBLIC_ASSET_PATH=/assets
+```

README.md

@@ -1,24 +1,30 @@
 import 'babel-polyfill';
-import 'css/base/index.scss';
 import React from 'react';
 import ReactDOM from 'react-dom';
 import { Provider } from 'react-redux';
 import { ConnectedRouter } from 'react-router-redux';
 import createHistory from 'history/createBrowserHistory';
 import configureStore from 'store';
 import App from 'containers/App';
+import Loadable from 'react-loadable';
+
+import './styles';
 
 // Hydrate the redux store from server state.
 const initialState = window.__INITIAL_STATE__;
 const history = createHistory();
 const store = configureStore(initialState, history);
 
 // Render the application
-ReactDOM.hydrate(
-  <Provider store={store}>
-    <ConnectedRouter history={history}>
-      <App />
-    </ConnectedRouter>
-  </Provider>,
-  document.getElementById('app')
-);
+window.main = () => {
+  Loadable.preloadReady().then(() => {
+    ReactDOM.hydrate(
+      <Provider store={store}>
+        <ConnectedRouter history={history}>
+          <App />
+        </ConnectedRouter>
+      </Provider>,
+      document.getElementById('app')
+    );
+  });
+};

client/index.js

@@ -0,0 +1,5 @@
+// Include all Vendor CSS here
+import 'semantic-ui-css/semantic.min.css';
+
+// Base styles
+import 'css/base/index.scss';

client/styles.js

@@ -0,0 +1,35 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+
+const Loading = (props) => {
+  const { error, timedOut, pastDelay } = props;
+
+  console.log(props);
+
+  if (error) {
+    // When the loader has errored
+    return (
+      <div>Error!</div>
+    );
+  } else if (timedOut) {
+    // When the loader has taken longer than the timeout
+    return (
+      <div>Taking a long time...</div>
+    );
+  } else if (pastDelay) {
+    // When the loader has taken longer than the delay
+    return (
+      <div>Loading...</div>
+    );
+  }
+
+  return null;
+};
+
+Loading.propTypes = {
+  error: PropTypes.bool,
+  timedOut: PropTypes.bool,
+  pastDelay: PropTypes.bool
+};
+
+export default Loading;

client/vendor.js

@@ -1,4 +1,5 @@
 export { default as ErrorPage } from './ErrorPage';
 export { default as Footer } from './Footer';
 export { default as Header } from './Header';
+export { default as Loading } from './Loading';
 export { default as RouteWithSubRoutes } from './RouteWithSubRoutes';

common/js/components/common/Loading/index.js

@@ -0,0 +1,54 @@
+import React, { Component } from 'react';
+import PropTypes from 'prop-types';
+import { Form } from 'semantic-ui-react';
+import classnames from 'classnames/bind';
+import css from './index.scss';
+
+class TodoForm extends Component {
+  static propTypes = {
+    onSubmit: PropTypes.func,
+    className: PropTypes.string
+  };
+
+  state = { todoText: '' };
+
+  submitTodo = ev => {
+    ev.preventDefault();
+
+    const { onSubmit } = this.props;
+    const { todoText } = this.state;
+
+    if (todoText && todoText !== '' && typeof onSubmit === 'function') {
+      onSubmit(todoText);
+      this.setState({ todoText: '' });
+    }
+  };
+
+  onTodoChange = ev => {
+    this.setState({ todoText: ev.target.value });
+  };
+
+  render() {
+    const { className } = this.props;
+    const { todoText } = this.state;
+
+    return (
+      <Form
+        className={classnames(css.todoForm, className)}
+        onSubmit={this.submitTodo}
+      >
+        <Form.Group>
+          <Form.Input
+            onChange={this.onTodoChange}
+            value={todoText}
+            type="text"
+            placeholder="Add a todo..."
+          />
+          <Form.Button content="Add" icon="plus" />
+        </Form.Group>
+      </Form>
+    );
+  }
+}
+
+export default TodoForm;