The plugin will return the internal storage directory
The description within the plugin.xml for InternalStorage is very short.
More information could be available on the GitHub README.

Installation is done via the Cordova CLI.

Install InternalStorage using the latest version from GitHub:

$ cordova plugin add https://github.com/TheKiteEatingTree/cordova-internalStorage.git

Supported Platforms
  • Android
  • BlackBerry 10
  • Fire OS
  • Firefox OS
  • iOS
  • Ubuntu
  • Windows 8
  • Windows Phone 7
  • Windows Phone 8
Supported Engines
  • cordova

    >=3.0.0