A space separated list of events that trigger a state save. Defaults to changed.jstree open_node.jstree close_node.jstree.
A function that will be executed prior to restoring state with one argument - the state object. Can be used to clear unwanted parts of the state.
A string for the key to use when saving the current tree (change if using multiple trees in your project). Defaults to jstree.
Time in milliseconds after which the state will expire. Defaults to 'false' meaning - no expire.