To use this package, clone the repo and install it with

npm i

To add new Firebase UI languages, you'll need to clone https://github.com/firebase/firebaseui-web, then run:

npm run build build-js-{LANGUAGE_CODE}

Language codes are defined here.

Then manually place the resulting language file (e.g. esm__ja.js) in firebaseui-web-react/firebaseui-i18n