Add support for fetching multiple translation files (vercel#2743)

* Add support for fetching multiple translation files

* Cleanup

Author: whphhg

examples/with-i18next/components/Post.js

@@ -0,0 +1,19 @@
+import React from 'react'
+import { translate } from 'react-i18next'
+
+class Post extends React.Component {
+  constructor (props) {
+    super(props)
+    this.t = props.t
+  }
+
+  render () {
+    return (
+      <div>
+        {this.t('namespace1:greatMorning')}
+      </div>
+    )
+  }
+}
+
+export default translate(['namespace1'])(Post)

examples/with-i18next/pages/index.js

@@ -3,13 +3,18 @@ import { I18nextProvider } from 'react-i18next'
 import startI18n from '../tools/startI18n'
 import { getTranslation } from '../tools/translationHelpers'
 import Title from '../components/Title'
+import Post from '../components/Post'
 
 // get language from query parameter or url path
 const lang = 'id'
 
 export default class Homepage extends Component {
   static async getInitialProps () {
-    const translations = await getTranslation(lang, 'common', 'http://localhost:3000/static/locales/')
+    const translations = await getTranslation(
+      lang,
+      ['common', 'namespace1'],
+      'http://localhost:3000/static/locales/'
+    )
 
     return { translations }
   }
@@ -23,7 +28,10 @@ export default class Homepage extends Component {
   render (props) {
     return (
       <I18nextProvider i18n={this.i18n}>
-        <Title />
+        <div>
+          <Title />
+          <Post />
+        </div>
       </I18nextProvider>
     )
   }

examples/with-i18next/static/locales/id/namespace1.json

@@ -0,0 +1,3 @@
+{
+  "greatMorning": "Pagi yang indah!"
+}

examples/with-i18next/static/locales/pt/namespace1.json

@@ -0,0 +1,3 @@
+{
+  "greatMorning": "Maravilhosa manhã!"
+}

examples/with-i18next/tools/startI18n.js

@@ -1,9 +1,15 @@
 import i18n from 'i18next'
 
-const startI18n = (file, lang) => i18n.init({
+/**
+ * Initialize a i18next instance.
+ * @function startI18n
+ * @param {object} files - Translation files.
+ * @param {string} lang - Active language.
+ */
+const startI18n = (files, lang) => i18n.init({
   lng: lang, // active language http://i18next.com/translate/
   fallbackLng: 'pt',
-  resources: file,
+  resources: files,
   ns: ['common'],
   defaultNS: 'common',
   debug: false

examples/with-i18next/tools/translationHelpers.js

@@ -1,13 +1,21 @@
 /* global fetch */
 import 'isomorphic-fetch'
 
-export async function getTranslation (lang, file, baseUrl) {
-  const response = await fetch(`${baseUrl}${lang}/${file}.json`)
-  const json = await response.json()
+/**
+ * Fetch translation file(s).
+ * @function getTranslation
+ * @param {string} lang - Language to fetch.
+ * @param {array} files - Translation files to fetch.
+ * @param {string} baseUrl - Locale location.
+ * @return {object} Fetched translation files.
+ */
+export async function getTranslation (lang, files, baseUrl) {
+  let translation = {}
 
-  return {
-    [lang]: {
-      [file]: json
-    }
+  for (let file of files) {
+    const response = await fetch(`${baseUrl}${lang}/${file}.json`)
+    translation[file] = await response.json()
   }
+
+  return { [lang]: translation }
 }