ionic state restore
[ERROR] ionic state has been removed as of CLI 3.0.
We recommend using Cordova directly to manage Cordova plugins and platforms.
The following commands fulfill the old ionic state functionality:
ionic cordova platform save | save existing installed platforms to config.xml
ionic cordova plugin save | save existing installed plugins to config.xml
ionic cordova platform --help | view help page for managing Cordova platforms
ionic cordova plugin --help | view help page for managing Cordova plugins
ionic cordova prepare | install platforms and plugins listed in config.xml
See https://cordova.apache.org/docs/en/latest/platform_plugin_versioning_ref/ for detail