diff --git a/types/vuex-i18n/index.d.ts b/types/vuex-i18n/index.d.ts
index e1f607ef39..f6b75afa1a 100644
--- a/types/vuex-i18n/index.d.ts
+++ b/types/vuex-i18n/index.d.ts
@@ -1,9 +1,10 @@
-// Type definitions for vuex-i18n 1.7
+// Type definitions for vuex-i18n 1.10
 // Project: https://github.com/dkfbasel/vuex-i18n
 // Definitions by: Cedric Kemp <https://github.com/jaeggerr>
 //                 Noam Kfir <https://github.com/noamkfir>
+//                 Suleimanov Artem <https://github.com/barahliush>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-// TypeScript Version: 2.3
+// TypeScript Version: 2.9
 
 import _Vue, { PluginObject } from "vue";
 
@@ -17,13 +18,21 @@ declare module "vue/types/vue" {
   }
 }
 
+export interface i18nState {
+  fallback: string | null;
+  locale: string | null;
+  translations: {
+    [key: string]: Translations;
+  };
+}
+
 export interface Translations {
   [key: string]: string | Translations;
 }
 
 export interface Ii18n {
   /** get the current locale */
-  locale(): string;
+  locale(): string | null;
 
   /** get all the registered locales */
   locales(): string[];
@@ -81,9 +90,14 @@ export interface Ii18n {
   localeExists(locale: string): boolean;
 
   /**
-   * check if the given key is available in the current or fallback locale
+   * check if the given key is available
+   * optional with a second parameter to limit the scope
+   * strict: only current locale (exact match)
+   * locale: current locale and parent language locale (i.e. en-us & en)
+   * fallback: current locale, parent language locale and fallback locale
+   * the default is fallback
    */
-  keyExists(key: string): boolean;
+  keyExists(key: string, scope?: string): boolean;
 }
 
 declare const _default: {
diff --git a/types/vuex-i18n/vuex-i18n-tests.ts b/types/vuex-i18n/vuex-i18n-tests.ts
index 82d9d864d9..11010df30b 100644
--- a/types/vuex-i18n/vuex-i18n-tests.ts
+++ b/types/vuex-i18n/vuex-i18n-tests.ts
@@ -3,11 +3,16 @@ import Vue from "vue";
 import { Store } from "vuex";
 
 // load vuex i18n module
-import vuexI18n from "vuex-i18n";
+import vuexI18n, { i18nState } from "vuex-i18n";
+
+// declare interface for store's root state
+interface RootState {
+    i18n: i18nState;
+}
 
 // initialize the vuex store using the vuex module. note that you can change the
-//  name of the module if you wish
-const store = new Store({});
+// name of the module if you wish
+const store = new Store<RootState>({});
 
 // initialize the internationalization plugin on the vue instance. note that
 // the store must be passed to the plugin. the plugin will then generate some