5 files changed, 77 insertions, 0 deletions
diff --git a/app_expo/i18n/en.json b/app_expo/i18n/en.json
new file mode 100644
index 0000000..be5c35c
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+++ b/app_expo/i18n/en.json
@@ -0,0 +1,34 @@
+{
+  "common": {
+    "ok": "OK!",
+    "cancel": "Cancel",
+    "back": "Back"
+  },
+  "errors": {
+    "invalidEmail": "Invalid email address."
+  },
+  "welcomeScreen": {
+    "poweredBy": "POWERED BY IGNITE",
+    "readyForLaunch": "Ready for launch.",
+    "continue": "CONTINUE"
+  },
+  "demoScreen": {
+    "howTo": "HOW TO",
+    "title": "What’s In This Stack?",
+    "tagLine": "Congratulations, you’ve got a very advanced React Native app template here.  Take advantage of this boilerplate!",
+    "reactotron": "Demo Reactotron",
+    "demoList": "Demo List",
+    "androidReactotronHint": "If this doesn't work, ensure the Reactotron desktop app is running, run adb reverse tcp:9090 tcp:9090 from your terminal, and reload the app.",
+    "iosReactotronHint": "If this doesn't work, ensure the Reactotron desktop app is running and reload app.",
+    "macosReactotronHint": "If this doesn't work, ensure the Reactotron desktop app is running and reload app.",
+    "webReactotronHint": "If this doesn't work, ensure the Reactotron desktop app is running and reload app.",
+    "windowsReactotronHint": "If this doesn't work, ensure the Reactotron desktop app is running and reload app."
+  },
+  "demoListScreen": {
+    "title": "Demo List"
+  },
+  "storybook": {
+    "placeholder": "Placeholder",
+    "field": "Field"
+  }
+}
diff --git a/app_expo/i18n/i18n.ts b/app_expo/i18n/i18n.ts
new file mode 100644
index 0000000..b29e80b
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+++ b/app_expo/i18n/i18n.ts
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+import * as Localization from 'expo-localization'
+import i18n from 'i18n-js'
+import en from './en.json'
+import ja from './ja.json'
+
+i18n.fallbacks = true
+i18n.translations = { en, ja }
+
+i18n.locale = Localization.locale || 'en'
+
+/**
+ * Builds up valid keypaths for translations.
+ * Update to your default locale of choice if not English.
+ */
+type DefaultLocale = typeof en
+export type TxKeyPath = RecursiveKeyOf<DefaultLocale>
+
+type RecursiveKeyOf<TObj extends Record<string, any>> = {
+  [TKey in keyof TObj & string]: TObj[TKey] extends Record<string, any>
+    ? `${TKey}` | `${TKey}.${RecursiveKeyOf<TObj[TKey]>}`
+    : `${TKey}`
+}[keyof TObj & string]
diff --git a/app_expo/i18n/index.ts b/app_expo/i18n/index.ts
new file mode 100644
index 0000000..b0ff148
--- /dev/null
+++ b/app_expo/i18n/index.ts
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+import './i18n'
+export * from './i18n'
+export * from './translate'
diff --git a/app_expo/i18n/ja.json b/app_expo/i18n/ja.json
new file mode 100644
index 0000000..7f53c8c
--- /dev/null
+++ b/app_expo/i18n/ja.json
@@ -0,0 +1,7 @@
+{
+  "common": {
+    "ok": "OK 🇯🇵",
+    "cancel": "Cancel 🇯🇵",
+    "back": "Back 🇯🇵"
+  }
+}
diff --git a/app_expo/i18n/translate.ts b/app_expo/i18n/translate.ts
new file mode 100644
index 0000000..6481874
--- /dev/null
+++ b/app_expo/i18n/translate.ts
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+import i18n from 'i18n-js'
+import { TxKeyPath } from './i18n'
+
+/**
+ * Translates text.
+ *
+ * @param key The i18n key.
+ */
+export function translate(key: TxKeyPath, options?: i18n.TranslateOptions) {
+  return key ? i18n.t(key, options) : null
+}