From 4cac8b913b5b7bce47416db67806be7f77c0c706 Mon Sep 17 00:00:00 2001
From: kazuya kawaguchi <kawakazu80@gmail.com>
Date: Sat, 17 Dec 2016 23:29:40 +0900
Subject: [PATCH] :star: new: add globally locale checking

---
 gitbook/api.md     | 12 ++++++++++++
 src/extend.js      | 13 +++++++++++++
 test/specs/i18n.js | 18 ++++++++++++++++++
 3 files changed, 43 insertions(+)

diff --git a/gitbook/api.md b/gitbook/api.md
index 0f7249bc7..f220cdd67 100644
--- a/gitbook/api.md
+++ b/gitbook/api.md
@@ -126,6 +126,18 @@
 - **Usage:**
   This is the same as the `$tc` method. This is translate pluralization function for global locale only. more detail see [$tc](#tc-keypath-choice-arguments-).
 
+### Vue.te(keypath, [lang])
+
+- **Arguments:**
+  - `{String} keypath`
+  - `{String} [lang]`
+
+- **Return:**
+  Whether keypath exists, boolean value
+
+- **Usage:**
+  Check whether key path exists in global locale. If you specified `lang`, check the locale of `lang`.
+
 ## Constructor Options
 
 ### locales
diff --git a/src/extend.js b/src/extend.js
index c8459d13d..1df036676 100644
--- a/src/extend.js
+++ b/src/extend.js
@@ -162,6 +162,19 @@ export default function (Vue) {
     return fetchChoice(Vue.t(key, ...args), choice)
   }
 
+  /**
+   * Vue.te
+   *
+   * @param {String} key
+   * @param {Array} ...args
+   * @return {Boolean}
+   */
+
+  Vue.te = (key, ...args) => {
+    const { lang } = parseArgs(...args)
+    return exist(getAssetLocale(lang), key)
+  }
+
   /**
    * $t
    *
diff --git a/test/specs/i18n.js b/test/specs/i18n.js
index 0496b20b3..299153ba9 100644
--- a/test/specs/i18n.js
+++ b/test/specs/i18n.js
@@ -270,6 +270,24 @@ describe('i18n', () => {
     })
   })
 
+  describe('Vue.te', () => {
+    describe('existing key', () => {
+      it('should return true', () => {
+        assert(Vue.te('message.hello') === true)
+      })
+
+      it('should return true with language', () => {
+        assert(Vue.te('message.hello', 'ja') === true)
+      })
+    })
+
+    describe('not existing key', () => {
+      it('should return false', () => {
+        assert(Vue.te('message.hallo') === false)
+      })
+    })
+  })
+
   describe('$t', () => {
     describe('en language locale', () => {
       it('should translate an english', () => {