Merge pull request #70 from markdegrootnl/load-callback

Added onLoad Option which is called after language is loaded.

Author: xiCO2k

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) => {}
 }
 
 /**
@@ -305,6 +306,7 @@ export class I18n {
       }
     }
 
+    this.options.onLoad(lang)
     return lang
   }
 

src/interfaces/options.ts

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

test/class.test.ts

@@ -68,3 +68,19 @@ it('allows resetting all data', async () => {
     expect(i18n.getActiveLanguage()).toBe('en')
     expect(i18n.trans('Welcome!')).toBe('Welcome!')
 })
+
+it('calls onLoad when loaded', async () => {
+    const onLoadFunction = jest.fn()
+
+    const i18n = new I18n({
+        lang: 'pt',
+        resolve: lang => import(`./fixtures/lang/${lang}.json`),
+        onLoad: onLoadFunction
+    })
+
+    await i18n.loadLanguageAsync('en')
+
+    expect(onLoadFunction).toHaveBeenCalledTimes(2)
+    expect(onLoadFunction).toHaveBeenCalledWith('en')
+    expect(onLoadFunction).toHaveBeenCalledWith('pt')
+})