Function t is not binding correctly in latest i18next versions

Question

The code below (a localization interceptor for an Alexa skill) works fine with i18next version 10.5.0 but doesn't work in the latest versions. It get a message of function t not being recognized, it would seem t is not binding correctly.

I can't find why this is happening (I don't know what was updated in i18next). Can anybody shed some light on this?

// This request interceptor will bind a translation function 't' to the requestAttributes object
const LocalizationInterceptor = {
  process(handlerInput) {
    const localizationClient = i18n.use(sprintf).init({
      lng: handlerInput.requestEnvelope.request.locale,
      fallbackLng: 'en',
      overloadTranslationOptionHandler: sprintf.overloadTranslationOptionHandler,
      resources: languageStrings,
      returnObjects: true
    });
    const attributes = handlerInput.attributesManager.getRequestAttributes();
    attributes.t = function (...args) {
      return localizationClient.t(...args);
    }
  }
}

Answer 1

Seems like t has to be handled as a continuation in a Promise in the latest versions so here's the solution:

// This request interceptor will bind a translation function 't' to the requestAttributes.
const LocalizationRequestInterceptor = {
    process(handlerInput) {
        i18n.use(sprintf).init({
            lng: handlerInput.requestEnvelope.request.locale,
            resources: languageStrings,
            overloadTranslationOptionHandler: sprintf.overloadTranslationOptionHandler,
        }).then((t) => {
            const attributes = handlerInput.attributesManager.getRequestAttributes();
            attributes.t = (...args) => t(...args);
        });
    },
};