Added onLoad Option which is called after language is loaded.

Author: markdegrootnl

src/index.ts

@@ -21,7 +21,8 @@ let sharedInstance: I18n = null
 const DEFAULT_OPTIONS: OptionsInterface = {
   lang: !isServer && document.documentElement.lang ? document.documentElement.lang.replace('-', '_') : null,
   fallbackLang: 'en',
-  resolve: (lang: string) => new Promise((resolve) => resolve({ default: {} }))
+  resolve: (lang: string) => new Promise((resolve) => resolve({ default: {} })),
+  onLoad: (lang: string) => {}
 }
 
 /**
@@ -157,7 +158,13 @@ export class I18n {
    * Loads the language.
    */
   load(): void {
-    this[isServer ? 'loadLanguage' : 'loadLanguageAsync'](this.getActiveLanguage())
+    const lang = this.getActiveLanguage()
+    if (isServer) {
+      this.loadLanguage(lang)
+      this.options.onLoad(lang)
+    } else {
+      this.loadLanguageAsync(lang).then(this.options.onLoad)
+    }
   }
 
   /**

src/interfaces/options.ts

@@ -7,4 +7,5 @@ export interface OptionsInterface {
   lang?: string
   fallbackLang?: string
   resolve?(lang: string): Promise<LanguageJsonFileInterface>
+  onLoad?: (lang: string) => void
 }