i18next: webpack2 - v3.5.x breaks `.use()` method

After upgrading from v3.4.4 to v3.5.0, I am no longer able to run:

import i18next from 'i18next';
import LngDetector from 'i18next-browser-languagedetector';
i18next.use(LngDetector);

Which now returns:

main.js:90 Uncaught TypeError: _i18next2.default.use is not a function

Printing out i18next indeed shows that the default export method no longer has the use method exposed.

This does not occur on v3.4.4.