cocos2d-x implement any Native SDK Wrapper Template . Covered for both android and ios environment.
$ curl -o CCNativeExtensionTEmplate.zip https://codeload.github.com/oke-ya/CCNativeExtensionTemplate/zip/master
$ unzip CCNativeExtensionTEmplate.zip
$ cd CCNativeExtensionTemplate-master
$ ./setup CCFirebase # Firebase is example.
$ git init
$ git add -A
$ git commit -m 'initial commit'
$ mv ..
$ mv CCNativeExtensionTemplate-master CCFirebase # Firebase is example.