AddListener adds a listener for changes to the given config key that calls the given callback function.

GetOption returns a config option, regardless of whether or not it has been registered.

NotifyListeners notifies listeners that the given config key has changed.

Registered returns all registered options, excluding hidden ones.

Registers a hidden config option without get/set events.

Registers a config option without get/set events.

Registers a config option with get/set events.

Option defines what a config value's name and type should be, along with any get/set events.

Event is run when a user tries to set or get a config value via `state config`.