import { IFeatureOptions } from './feature-options';
export interface IStorageSyncOptions<T> {
    /**
     * By default, states are not synced, provide the feature states you want to sync.
     */
    features: IFeatureOptions<T>[];
    /**
     * Provide the storage type to sync the state to, it can be any storage which implements the 'Storage' interface.
     */
    storage: Storage;
    /**
     * Give the state a version. Version will be checked before rehydration.
     *
     * @examples
     *  Version from Storage = 1 and Config.version = 2 --> Skip hydration
     *
     *  Version from Storage = undefined and Config.version = 1 --> Skip hydration
     *
     *  Version from Storage = 1 and Config.version = undefined --> Skip hydration
     *
     *  Version from Storage = 1 and Config.version = 1 --> Hydrate
     */
    version?: number;
    /**
     * Under which key the version should be saved into storage
     */
    versionKey?: string;
    /**
     * Function that gets executed on a storage error
     * @param error the error that occurred
     */
    storageError?: (error: any) => void;
    /**
     * Restore last known state from storage on startup
     */
    rehydrate?: boolean;
    /**
     * Serializer for storage keys
     * @param key the storage item key
     */
    storageKeySerializer?: (key: string) => string;
    /**
     * Custom state merge function after rehydration (by default it does a deep merge)
     * @param state the next state
     * @param rehydratedState the state resolved from a storage location
     */
    rehydrateStateMerger?: (state: T, rehydratedState: T) => T;
}