vercel · timneutkens · Feb 24, 2017 · Feb 9, 2017 · Feb 24, 2017 · sedubois
diff --git a/examples/with-react-intl/.babelrc b/examples/with-react-intl/.babelrc
@@ -0,0 +1,19 @@
+{
+  "presets": [
+    "next/babel"
+  ],
+  "env": {
+    "development": {
+      "plugins": [
+        "react-intl"
+      ]
+    },
+    "production": {
+      "plugins": [
+        ["react-intl", {
+          "messagesDir": "lang/.messages/"
+        }]
+      ]
+    }
+  }
+}
diff --git a/examples/with-react-intl/.gitignore b/examples/with-react-intl/.gitignore
@@ -0,0 +1 @@
+lang/.messages/
diff --git a/examples/with-react-intl/README.md b/examples/with-react-intl/README.md
@@ -0,0 +1,51 @@
+# Example app with [React Intl][]
+
+## How to use
+
+Download the example [or clone the repo](https://github.com/zeit/next.js.git):
+
+```bash
+curl https://codeload.github.com/zeit/next.js/tar.gz/master | tar -xz --strip=2 next.js-master/examples/with-react-intl
+cd with-react-intl
+```
+
+Install it and run:
+
+```bash
+npm install
+npm run dev
+```
+
+Deploy it to the cloud with [now](https://zeit.co/now) ([download](https://zeit.co/download))
+
+```bash
+now
+```
+
+## The idea behind the example
+
+This example app shows how to integrate [React Intl][] with Next.
+
+### Features of this example app
+
+- Server-side language negotiation
+- React Intl locale data loading via `pages/_document.js` customization
+- React Intl integration at Next page level via `pageWithIntl()` HOC
+- `<IntlProvider>` creation with `locale`, `messages`, and `initialNow` props
+- Default message extraction via `babel-plugin-react-intl` integration
+- Translation management via build script and customized Next server
+
+### Translation Management
+
+This app stores translations and default strings in the `lang/` dir. This dir has `.messages/` subdir which is where React Intl's Babel plugin outputs the default messages it extracts from the source code. The default messages (`en.json` in this example app) is also generated by the build script. This file can then be sent to a translation service to perform localization for the other locales the app should support.
+
+The translated messages files that exist at `lang/*.json` are only used during production, and are automatically provided to the `<IntlProvider>`. During development the `defaultMessage`s defined in the source code are used. To prepare the example app for localization and production run the build script and start the server in production mode:
+
+```
+$ npm run build
+$ npm start
+```
+
+You can then switch your browser's language preferences to French and refresh the page to see the UI update accordingly.
+
+[React Intl]: https://github.com/yahoo/react-intl
diff --git a/examples/with-react-intl/components/Layout.js b/examples/with-react-intl/components/Layout.js
@@ -0,0 +1,27 @@
+import React from 'react'
+import {defineMessages, injectIntl} from 'react-intl'
+import Head from 'next/head'
+import Nav from './Nav'
+
+const messages = defineMessages({
+  title: {
+    id: 'title',
+    defaultMessage: 'React Intl Next.js Example'
+  }
+})
+
+export default injectIntl(({intl, title, children}) => (
+  <div>
+    <Head>
+      <meta name='viewport' content='width=device-width, initial-scale=1' />
+      <title>{title || intl.formatMessage(messages.title)}</title>
+    </Head>
+
+    <header>
+      <Nav />
+    </header>
+
+    {children}
+
+  </div>
+))
diff --git a/examples/with-react-intl/components/Nav.js b/examples/with-react-intl/components/Nav.js
@@ -0,0 +1,28 @@
+import React from 'react'
+import {FormattedMessage} from 'react-intl'
+import Link from 'next/link'
+
+export default () => (
+  <nav>
+    <li>
+      <Link href='/'>
+        <a><FormattedMessage id='nav.home' defaultMessage='Home' /></a>
+      </Link>
+    </li>
+    <li>
+      <Link href='/about'>
+        <a><FormattedMessage id='nav.about' defaultMessage='About' /></a>
+      </Link>
+    </li>
+
+    <style jsx>{`
+      nav {
+        display: flex;
+      }
+      li {
+        list-style: none;
+        margin-right: 1rem;
+      }
+    `}</style>
+  </nav>
+)
diff --git a/examples/with-react-intl/components/PageWithIntl.js b/examples/with-react-intl/components/PageWithIntl.js
@@ -0,0 +1,44 @@
+import React, {Component} from 'react'
+import {IntlProvider, addLocaleData, injectIntl} from 'react-intl'
+
+// Register React Intl's locale data for the user's locale in the browser. This
+// locale data was added to the page by `pages/_document.js`. This only happens
+// once, on initial page load in the browser.
+if (typeof window !== 'undefined' && window.ReactIntlLocaleData) {
+  Object.keys(window.ReactIntlLocaleData).forEach((lang) => {
+    addLocaleData(window.ReactIntlLocaleData[lang])
+  })
+}
+
+export default (Page) => {
+  const IntlPage = injectIntl(Page)
+
+  return class PageWithIntl extends Component {
+    static async getInitialProps (context) {
+      let props
+      if (typeof Page.getInitialProps === 'function') {
+        props = await Page.getInitialProps(context)
+      }
+
+      // Get the `locale` and `messages` from the request object on the server.
+      // In the browser, use the same values that the server serialized.
+      const {req} = context
+      const {locale, messages} = req || window.__NEXT_DATA__.props
+
+      // Always update the current time on page load/transition because the
+      // <IntlProvider> will be a new instance even with pushState routing.
+      const now = Date.now()
+
+      return {...props, locale, messages, now}
+    }
+
+    render () {
+      const {locale, messages, now, ...props} = this.props
+      return (
+        <IntlProvider locale={locale} messages={messages} initialNow={now}>
+          <IntlPage {...props} />
+        </IntlProvider>
+      )
+    }
+  }
+}
diff --git a/examples/with-react-intl/lang/en.json b/examples/with-react-intl/lang/en.json
@@ -0,0 +1,7 @@
+{
+  "title": "React Intl Next.js Example",
+  "nav.home": "Home",
+  "nav.about": "About",
+  "description": "An example app integrating React Intl with Next.js",
+  "greeting": "Hello, World!"
+}
diff --git a/examples/with-react-intl/lang/fr.json b/examples/with-react-intl/lang/fr.json
@@ -0,0 +1,7 @@
+{
+  "title": "React Intl Next.js Exemple",
+  "nav.home": "Accueil",
+  "nav.about": "À propos de nous",
+  "description": "Un exemple d'application intégrant React Intl avec Next.js",
+  "greeting": "Bonjour le monde!"
+}
diff --git a/examples/with-react-intl/package.json b/examples/with-react-intl/package.json
@@ -0,0 +1,22 @@
+{
+  "name": "react-intl-example-next",
+  "version": "1.0.0",
+  "description": "React Intl Next.js Example App",
+  "author": "Eric Ferraiuolo <edf@ericf.me>",
+  "license": "BSD-3-Clause",
+  "scripts": {
+    "dev": "node server.js",
+    "build": "next build && node ./scripts/default-lang",
+    "start": "NODE_ENV=production node server.js"
+  },
+  "dependencies": {
+    "accepts": "^1.3.3",
+    "babel-plugin-react-intl": "^2.3.1",
+    "glob": "^7.1.1",
+    "intl": "^1.2.5",
+    "next": "^2.0.0-beta",
+    "react": "^15.4.2",
+    "react-dom": "^15.4.2",
+    "react-intl": "^2.2.3"
+  }
+}
diff --git a/examples/with-react-intl/pages/_document.js b/examples/with-react-intl/pages/_document.js
@@ -0,0 +1,31 @@
+import Document, {Head, Main, NextScript} from 'next/document'
+
+// The document (which is SSR-only) needs to be customized to expose the locale
+// data for the user's locale for React Intl to work in the browser.
+export default class IntlDocument extends Document {
+  static async getInitialProps (context) {
+    const props = await super.getInitialProps(context)
+    const {req: {localeDataScript}} = context
+    return {
+      ...props,
+      localeDataScript
+    }
+  }
+
+  render () {
+    return (
+      <html>
+        <Head />
+        <body>
+          <Main />
+          <script
+            dangerouslySetInnerHTML={{
+              __html: this.props.localeDataScript
+            }}
+          />
+          <NextScript />
+        </body>
+      </html>
+    )
+  }
+}
diff --git a/examples/with-react-intl/pages/about.js b/examples/with-react-intl/pages/about.js
@@ -0,0 +1,25 @@
+import React, {Component} from 'react'
+import {FormattedRelative} from 'react-intl'
+import pageWithIntl from '../components/PageWithIntl'
+import Layout from '../components/Layout'
+
+class About extends Component {
+  static async getInitialProps ({req}) {
+    return {someDate: Date.now()}
+  }
+
+  render () {
+    return (
+      <Layout>
+        <p>
+          <FormattedRelative
+            value={this.props.someDate}
+            updateInterval={1000}
+          />
+        </p>
+      </Layout>
+    )
+  }
+}
+
+export default pageWithIntl(About)
diff --git a/examples/with-react-intl/pages/index.js b/examples/with-react-intl/pages/index.js
@@ -0,0 +1,26 @@
+import React from 'react'
+import {FormattedMessage, FormattedNumber, defineMessages} from 'react-intl'
+import Head from 'next/head'
+import pageWithIntl from '../components/PageWithIntl'
+import Layout from '../components/Layout'
+
+const {description} = defineMessages({
+  description: {
+    id: 'description',
+    defaultMessage: 'An example app integrating React Intl with Next.js'
+  }
+})
+
+export default pageWithIntl(({intl}) => (
+  <Layout>
+    <Head>
+      <meta name='description' content={intl.formatMessage(description)} />
+    </Head>
+    <p>
+      <FormattedMessage id='greeting' defaultMessage='Hello, World!' />
+    </p>
+    <p>
+      <FormattedNumber value={1000} />
+    </p>
+  </Layout>
+))
diff --git a/examples/with-react-intl/scripts/default-lang.js b/examples/with-react-intl/scripts/default-lang.js
@@ -0,0 +1,19 @@
+const {readFileSync, writeFileSync} = require('fs')
+const {resolve} = require('path')
+const glob = require('glob')
+
+const defaultMessages = glob.sync('./lang/.messages/**/*.json')
+  .map((filename) => readFileSync(filename, 'utf8'))
+  .map((file) => JSON.parse(file))
+  .reduce((messages, descriptors) => {
+    descriptors.forEach(({id, defaultMessage}) => {
+      if (messages.hasOwnProperty(id)) {
+        throw new Error(`Duplicate message id: ${id}`)
+      }
+      messages[id] = defaultMessage
+    })
+    return messages
+  }, {})
+
+writeFileSync('./lang/en.json', JSON.stringify(defaultMessages, null, 2))
+console.log(`> Wrote default messages to: "${resolve('./lang/en.json')}"`)
diff --git a/examples/with-react-intl/server.js b/examples/with-react-intl/server.js
@@ -0,0 +1,53 @@
+// Polyfill Node with `Intl` that has data for all locales.
+// See: https://formatjs.io/guides/runtime-environments/#server
+const IntlPolyfill = require('intl')
+Intl.NumberFormat = IntlPolyfill.NumberFormat
+Intl.DateTimeFormat = IntlPolyfill.DateTimeFormat
+
+const {readFileSync} = require('fs')
+const {basename} = require('path')
+const {createServer} = require('http')
+const accepts = require('accepts')
+const glob = require('glob')
+const next = require('next')
+
+const dev = process.env.NODE_ENV !== 'production'
+const app = next({dev})
+const handle = app.getRequestHandler()
+
+// Get the supported languages by looking for translations in the `lang/` dir.
+const languages = glob.sync('./lang/*.json').map((f) => basename(f, '.json'))
+
+// We need to expose React Intl's locale data on the request for the user's
+// locale. This function will also cache the scripts by lang in memory.
+const localeDataCache = new Map()
+const getLocaleDataScript = (locale) => {
+  const lang = locale.split('-')[0]
+  if (!localeDataCache.has(lang)) {
+    const localeDataFile = require.resolve(`react-intl/locale-data/${lang}`)
+    const localeDataScript = readFileSync(localeDataFile, 'utf8')
+    localeDataCache.set(lang, localeDataScript)
+  }
+  return localeDataCache.get(lang)
+}
+
+// We need to load and expose the translations on the request for the user's
+// locale. These will only be used in production, in dev the `defaultMessage` in
+// each message description in the source code will be used.
+const getMessages = (locale) => {
+  return require(`./lang/${locale}.json`)
+}
+
+app.prepare().then(() => {
+  createServer((req, res) => {
+    const accept = accepts(req)
+    const locale = accept.language(dev ? ['en'] : languages)
+    req.locale = locale
+    req.localeDataScript = getLocaleDataScript(locale)
+    req.messages = dev ? {} : getMessages(locale)
+    handle(req, res)
+  }).listen(3000, (err) => {
+    if (err) throw err
+    console.log('> Read on http://localhost:3000')
+  })
+})