property 'getCurrentUser' does not exist on type 'FirebaseX'

[AliYusuf95]

I'm submitting a ...
[x] bug report
[x] feature request
[ ] support request

Current behavior:
FirebaseX missinggetCurrentUser method. Actually, there are a lot of methods are missing.

Expected behavior:
All methods described in the plugin documentation should exist.

Ionic info: (run ionic info from a terminal/cmd prompt and paste output below):

Ionic:

   Ionic CLI                     : 6.3.0
   Ionic Framework               : @ionic/angular 5.0.5
   @angular-devkit/build-angular : 0.803.25
   @angular-devkit/schematics    : 8.3.25
   @angular/cli                  : 8.3.25
   @ionic/angular-toolkit        : 2.2.0

Capacitor:

   Capacitor CLI   : 1.5.1
   @capacitor/core : 1.5.1

Utility:

   cordova-res : not installed
   native-run  : not installed

System:

   NodeJS : v12.13.1 (/Users/ali/.nvm/versions/node/v12.13.1/bin/node)
   npm    : 6.13.7
   OS     : macOS Catalina