I18Next - wait for Redux store to be set with local data - react-native

Question

I would like for i18next to wait for the redux store to be ready. I'm storing the user's chosen language in the store, using persistor from redux-persist to rehydrate it at app startup. I tried to set the language from the store :
// ...
import store from '../redux';
// ...
const lng = store.getState().user.language
? store.getState().user.language
: Localization.locale.slice(0, 2);
i18next
// .use(languageDetector)
.use(initReactI18next)
.init({
fallbackLng: 'en',
debug: true,
resources,
lng,
});
But at this point the store is still in its initialState and not rehydrated yet. Is there a way I could do this?

Answer 1

So the PersistGate can implement an onBeforeLift method, waiting for it to be resolved before lifting the "loading" state.
const onBeforeLift = async () => {
await initI18Next();
};
export default function App(): React.ReactElement {
return (
<Provider store={store}>
<PersistGate
loading={<SplashScreen />}
persistor={persistor}
onBeforeLift={onBeforeLift}
>
<StatusBar hidden />
<MainNavigation />
</PersistGate>
</Provider>
);
}
And in i18n.ts:
const resources = {
en: { translation: en },
fr: { translation: fr },
he: { translation: he },
};
export const init = () => {
const lng = store.getState().user.language
? store.getState().user.language
: Localization.locale.slice(0, 2);
return (
i18next
.use(initReactI18next)
.init({
fallbackLng: 'en',
debug: true,
resources,
lng,
})
);
};
export default i18next;