/**
 * Discriminates the type of modification made to an actor state item.
 *
 * The actor state manager tracks modifications to actor state through transactional
 * state batches. Each change is tagged with its kind to determine how the state
 * persistence layer should handle it when `saveState()` is called.
 *
 * State changes are staged locally and only persisted when {@link ActorStateManager#saveState}
 * is explicitly called (typically at the end of each actor method invocation).
 */
declare enum StateChangeKind {
    /**
     * No pending modification for this state item.
     *
     * The state item exists in persistent storage but has not been modified during
     * this invocation. No action is required on persistence.
     */
    NONE = 0,
    /**
     * State item is newly added and must be persisted.
     *
     * This state key did not exist before this invocation and has been created through
     * `addState()` or `getOrAddState()`. Will be persisted as an "upsert" (insert or update)
     * operation to the state provider.
     */
    ADD = 1,
    /**
     * State item has been modified and must be updated in persistent storage.
     *
     * The state key existed prior to this invocation (or was marked for removal) and has been
     * modified through `setState()` or `addOrUpdateState()`. Will be persisted as an "upsert"
     * operation to the state provider.
     */
    UPDATE = 2,
    /**
     * State item must be removed from persistent storage.
     *
     * This state key is marked for deletion through `removeState()` or `tryRemoveState()`.
     * Will be persisted as a "delete" operation to the state provider.
     */
    REMOVE = 3
}
export default StateChangeKind;