Guava compatibility

[Solido]

Just a quick question about the compatibility of the lib with the latest version of Google Guava which led me to some problems when I updated my project to the last one 21.0. A gradle dependencies display an old version required for Firebase. com.google.guava:guava-jdk5:17.0

Also I'm really interested in the Firebase SDK to handle the users management. Do you have any plan to reach NodeJS compatibility ?

Regards to the team