Use Function Components and Hooks

docs/data-fetching.md

@@ -41,14 +41,22 @@ React components as follows:
 #### React Component
 
 ```js
-class Post extends React.Component {
-  static contextTypes = { fetch: PropTypes.func.isRequired };
-  handleDelete = (event) => {
-    event.preventDefault();
-    const id = event.target.dataset['id'];
-    this.context.fetch(`/api/posts/${id}`, { method: 'DELETE' }).then(...);
-  };
-  render() { ... }
+import {useContext} from 'react';
+import ApplicationContext from '../ApplicationContext';
+
+function Post() {
+  const {context} = useContext(ApplicationContext);
+  return (
+    <div>
+      ...
+      <a onClick={(event) => {
+        event.preventDefault();
+        const id = event.target.dataset['id'];
+        // Use context.fetch to make it work in both server-side and client-side
+        context.fetch(`/api/posts/${id}`, { method: 'DELETE' }).then(...);
+      }}>Delete</a>
+    </div>
+  );
 }
 ```
 

docs/react-style-guide.md

@@ -127,10 +127,11 @@ Navigation.propTypes = { items: PropTypes.array.isRequired };
 // Navigation.js
 import React from 'react';
 import PropTypes from 'prop-types';
-import withStyles from 'isomorphic-style-loader/withStyles';
+import useStyles from 'isomorphic-style-loader/useStyles';
 import s from './Navigation.scss';
 
-function Navigation() {
+export default function Navigation() {
+  useStyles(s);
   return (
     <nav className={`${s.root} ${this.props.className}`}>
       <ul className={s.items}>
@@ -150,8 +151,6 @@ function Navigation() {
 }
 
 Navigation.propTypes = { className: PropTypes.string };
-
-export default withStyles(Navigation, s);
 ```
 
 ### Use higher-order components
@@ -205,14 +204,11 @@ export default withViewport;
 
 ```js
 // MyComponent.js
-import React from 'react';
 import withViewport from './withViewport';
 
-class MyComponent {
-  render() {
-    let { width, height } = this.props.viewport;
-    return <div>{`Viewport: ${width}x${height}`}</div>;
-  }
+function MyComponent(props) {
+  const { width, height } = props.viewport;
+  return <div>{`Viewport: ${width}x${height}`}</div>;
 }
 
 export default withViewport(MyComponent);

docs/recipes/how-to-implement-routing.md

@@ -157,38 +157,36 @@ In order to trigger client-side navigation without causing full-page refresh, yo
 `history.push()` method, for example:
 
 ```js
-import React from 'react';
 import history from '../history';
 
-class App extends React.Component {
-  transition = event => {
-    event.preventDefault();
-    history.push({
-      pathname: event.currentTarget.pathname,
-      search: event.currentTarget.search,
-    });
-  };
-  render() {
-    return (
-      <ul>
-        <li>
-          <a href="/" onClick={this.transition}>
-            Home
-          </a>
-        </li>
-        <li>
-          <a href="/one" onClick={this.transition}>
-            One
-          </a>
-        </li>
-        <li>
-          <a href="/two" onClick={this.transition}>
-            Two
-          </a>
-        </li>
-      </ul>
-    );
-  }
+function transition(event) {
+  event.preventDefault();
+  history.push({
+    pathname: event.currentTarget.pathname,
+    search: event.currentTarget.search,
+  });
+}
+
+function App() {
+  return (
+    <ul>
+      <li>
+        <a href="/" onClick={transition}>
+          Home
+        </a>
+      </li>
+      <li>
+        <a href="/one" onClick={transition}>
+          One
+        </a>
+      </li>
+      <li>
+        <a href="/two" onClick={transition}>
+          Two
+        </a>
+      </li>
+    </ul>
+  );
 }
 ```
 

docs/recipes/how-to-integrate-disqus.md

@@ -65,22 +65,17 @@ export default DisqusThread;
 #### `MyComponent.js`
 
 ```js
-import React from 'react';
 import DisqusThread from './DisqusThread.js';
 
-class MyComponent extends React.Component {
-  render() {
-    return (
-      <div>
-        <DisqusThread
-          id="e94d73ff-fd92-467d-b643-c86889f4b8be"
-          title="How to integrate Disqus into ReactJS App"
-          path="/blog/123-disquss-integration"
-        />
-      </div>
-    );
-  }
+export default function MyComponent() {
+  return (
+    <div>
+      <DisqusThread
+        id="e94d73ff-fd92-467d-b643-c86889f4b8be"
+        title="How to integrate Disqus into ReactJS App"
+        path="/blog/123-disquss-integration"
+      />
+    </div>
+  );
 }
-
-export default MyComponent;
 ```

src/components/App.js

@@ -13,13 +13,6 @@ import PropTypes from 'prop-types';
 import StyleContext from 'isomorphic-style-loader/StyleContext';
 import ApplicationContext from './ApplicationContext';
 
-const ContextType = {
-  // Universal HTTP client
-  fetch: PropTypes.func.isRequired,
-  pathname: PropTypes.string.isRequired,
-  query: PropTypes.object,
-};
-
 /**
  * The top-level React component setting context (global) variables
  * that can be accessed from all the child components.
@@ -34,36 +27,36 @@ const ContextType = {
  *   };
  *
  *   ReactDOM.render(
- *     <App context={context}>
+ *     <App context={context} insertCss={() => {}}>
  *       <Layout>
  *         <LandingPage />
  *       </Layout>
  *     </App>,
  *     container,
  *   );
  */
-class App extends React.PureComponent {
-  static propTypes = {
-    // Enables critical path CSS rendering
-    // https://github.com/kriasoft/isomorphic-style-loader
-    insertCss: PropTypes.func.isRequired,
-    context: PropTypes.shape(ContextType).isRequired,
-    children: PropTypes.element.isRequired,
-  };
 
-  render() {
-    const { context, insertCss } = this.props;
-
-    // NOTE: If you need to add or modify header, footer etc. of the app,
-    // please do that inside the Layout component.
-    return (
-      <StyleContext.Provider value={{ insertCss }}>
-        <ApplicationContext.Provider value={{ context }}>
-          {React.Children.only(this.props.children)}
-        </ApplicationContext.Provider>
-      </StyleContext.Provider>
-    );
-  }
+export default function App({ context, insertCss, children }) {
+  // NOTE: If you need to add or modify header, footer etc. of the app,
+  // please do that inside the Layout component.
+  return (
+    <StyleContext.Provider value={{ insertCss }}>
+      <ApplicationContext.Provider value={{ context }}>
+        {React.Children.only(children)}
+      </ApplicationContext.Provider>
+    </StyleContext.Provider>
+  );
 }
 
-export default App;
+App.propTypes = {
+  // Enables critical path CSS rendering
+  // https://github.com/kriasoft/isomorphic-style-loader
+  insertCss: PropTypes.func.isRequired,
+  context: PropTypes.shape({
+    // Universal HTTP client
+    fetch: PropTypes.func.isRequired,
+    pathname: PropTypes.string.isRequired,
+    query: PropTypes.object,
+  }).isRequired,
+  children: PropTypes.element.isRequired,
+};

src/components/Feedback/Feedback.js

@@ -7,32 +7,29 @@
  * LICENSE.txt file in the root directory of this source tree.
  */
 
+import useStyles from 'isomorphic-style-loader/useStyles';
 import React from 'react';
-import withStyles from 'isomorphic-style-loader/withStyles';
 import s from './Feedback.css';
 
-class Feedback extends React.Component {
-  render() {
-    return (
-      <div className={s.root}>
-        <div className={s.container}>
-          <a
-            className={s.link}
-            href="https://gitter.im/kriasoft/react-starter-kit"
-          >
-            Ask a question
-          </a>
-          <span className={s.spacer}>|</span>
-          <a
-            className={s.link}
-            href="https://github.com/kriasoft/react-starter-kit/issues/new"
-          >
-            Report an issue
-          </a>
-        </div>
+export default function Feedback() {
+  useStyles(s);
+  return (
+    <div className={s.root}>
+      <div className={s.container}>
+        <a
+          className={s.link}
+          href="https://gitter.im/kriasoft/react-starter-kit"
+        >
+          Ask a question
+        </a>
+        <span className={s.spacer}>|</span>
+        <a
+          className={s.link}
+          href="https://github.com/kriasoft/react-starter-kit/issues/new"
+        >
+          Report an issue
+        </a>
       </div>
-    );
-  }
+    </div>
+  );
 }
-
-export default withStyles(s)(Feedback);

src/components/Footer/Footer.js

@@ -7,37 +7,35 @@
  * LICENSE.txt file in the root directory of this source tree.
  */
 
+import useStyles from 'isomorphic-style-loader/useStyles';
 import React from 'react';
-import withStyles from 'isomorphic-style-loader/withStyles';
 import s from './Footer.css';
 import Link from '../Link';
 
-class Footer extends React.Component {
-  render() {
-    return (
-      <div className={s.root}>
-        <div className={s.container}>
-          <span className={s.text}>© Your Company</span>
-          <span className={s.spacer}>·</span>
-          <Link className={s.link} to="/">
-            Home
-          </Link>
-          <span className={s.spacer}>·</span>
-          <Link className={s.link} to="/admin">
-            Admin
-          </Link>
-          <span className={s.spacer}>·</span>
-          <Link className={s.link} to="/privacy">
-            Privacy
-          </Link>
-          <span className={s.spacer}>·</span>
-          <Link className={s.link} to="/not-found">
-            Not Found
-          </Link>
-        </div>
+export default function Footer() {
+  useStyles(s);
+
+  return (
+    <div className={s.root}>
+      <div className={s.container}>
+        <span className={s.text}>© Your Company</span>
+        <span className={s.spacer}>·</span>
+        <Link className={s.link} to="/">
+          Home
+        </Link>
+        <span className={s.spacer}>·</span>
+        <Link className={s.link} to="/admin">
+          Admin
+        </Link>
+        <span className={s.spacer}>·</span>
+        <Link className={s.link} to="/privacy">
+          Privacy
+        </Link>
+        <span className={s.spacer}>·</span>
+        <Link className={s.link} to="/not-found">
+          Not Found
+        </Link>
       </div>
-    );
-  }
+    </div>
+  );
 }
-
-export default withStyles(s)(Footer);