fix: Update types (#212)

types/vue.d.ts

@@ -1,14 +1,100 @@
+import Vue from "vue";
+import { RawLocation } from "vue-router";
+import VueI18n from "vue-i18n";
+
 /**
- * Extends interfaces in Vue.js
+ * The nuxt-i18n types namespace
  */
+declare namespace NuxtVueI18n {
+  type Locale = VueI18n.Locale
 
-import Vue from "vue";
-import { RawLocation } from "vue-router";
+  namespace Options {
+    // e.g.:
+    // [
+    //   { code: 'en', iso: 'en-US', file: 'en.js' },
+    //   { code: 'fr', iso: 'fr-FR', file: 'fr.js' },
+    //   { code: 'es', iso: 'es-ES', file: 'es.js' }
+    // ]
+    interface LocaleObject {
+      code: Locale
+      // can be undefined: https://goo.gl/cCGKUV
+      iso?: string
+      // can be undefined: https://goo.gl/ryc5pF
+      file?: string
+      // Allow custom properties, e.g. "name": https://goo.gl/wrcb2G
+      [key: string]: any
+    }
 
+    interface DetectBrowserLanguageInterface {
+      useCookie: boolean
+      cookieKey: string
+      alwaysRedirect: boolean
+      fallbackLocale: Locale | null
+    }
+
+    interface Vuex {
+      moduleName: string
+      mutations: {
+        setLocale: string
+        setMessages: string
+      }
+      preserveState: boolean
+    }
+
+    // special options for a "app.i18n" property: https://goo.gl/UwNfZo
+    interface VueI18nInterface {
+      locales: Array<Locale | LocaleObject>
+      defaultLocale: null | Locale
+      differentDomains: boolean
+      forwardedHost: boolean
+      routesNameSeparator: string
+      beforeLanguageSwitch: () => any
+      onLanguageSwitched: () => any
+    }
+
+    // see options reference: https://github.com/nuxt-community/nuxt-i18n/blob/master/docs/options-reference.md
+    interface AllOptionsInterface extends VueI18nInterface {
+      vueI18n: VueI18n.I18nOptions
+      strategy: "prefix_except_default" | "prefix" | "prefix_and_default"
+      lazy: boolean
+      langDir: string | null
+      rootRedirect: string | null
+      detectBrowserLanguage: Options.DetectBrowserLanguageInterface
+      seo: false
+      baseUrl: string
+      vuex: Options.Vuex
+      parsePages: boolean
+      // see https://goo.gl/NbzX3f
+      pages: {
+        [key: string]: boolean | {
+          [key: string]: boolean | string
+        }
+      }
+      encodePaths: boolean
+    }
+  }
+}
+
+/**
+ * Extends types in vue
+ */
 declare module "vue/types/vue" {
   interface Vue {
     localePath(route: RawLocation, locale?: string): string;
     switchLocalePath(locale: string): string;
     getRouteBaseName(route: RawLocation): string;
+    // PHPStorm without this indicates that "$i18n" was not found.
+    readonly $i18n: VueI18n & IVueI18n;
+  }
+}
+
+/**
+ * Extends types in vue-i18n
+ */
+declare module "vue-i18n" {
+  // the VueI18n class expands here: https://goo.gl/Xtp9EG
+  // it is necessary for the $i18n property in Vue interface: "readonly $i18n: VueI18n & IVueI18n"
+  interface IVueI18n extends NuxtVueI18n.Options.VueI18nInterface {
+
   }
 }