/**
 * Options to be used to construct a {@link VuexPersistence} object
 */
import { Payload } from 'vuex';
import { AsyncStorage } from './AsyncStorage';
import { MergeOptionType } from './utils';
export interface PersistOptions<S> {
    /**
     * Window.Storage type object. Default is localStorage
     */
    storage?: Storage | AsyncStorage;
    /**
     * Method to retrieve state from persistence
     * @param key
     * @param [storage]
     */
    restoreState?: (key: string, storage?: Storage) => Promise<S> | S;
    /**
     * Method to save state into persistence
     * @param key
     * @param state
     * @param [storage]
     */
    saveState?: (key: string, state: {}, storage?: Storage) => Promise<void> | void;
    /**
     * Function to reduce state to the object you want to save.
     * Be default, we save the entire state.
     * You can use this if you want to save only a portion of it.
     * @param state
     */
    reducer?: (state: S) => {};
    /**
     * Key to use to save the state into the storage
     */
    key?: string;
    /**
     * Method to filter which mutations will trigger state saving
     * Be default returns true for all mutations.
     * Check mutations using <code>mutation.type</code>
     * @param mutation object of type {@link Payload}
     */
    filter?: (mutation: Payload) => boolean;
    /**
     * Names of modules that you want to persist.
     * If you create your custom {@link PersistOptions.reducer} function,
     * then that will override filter behaviour, not this argument
     */
    modules?: string[];
    /**
     * Set this to true to support
     * <a href="https://vuex.vuejs.org/en/strict.html">Vuex Strict Mode</a>
     * @default false
     */
    strictMode?: boolean;
    /**
     * If your storage is async
     * i.e., if setItem(), getItem() etc return Promises
     * (Must be used for asynchronous storages like LocalForage)
     * @default false
     */
    asyncStorage?: boolean;
    /**
     * Support serializing circular json objects
     * <pre>
     *   let x = {a: 10}
     *   x.b = x
     *   console.log(x.a) // 10
     *   console.log(x.b.a) // 10
     *   console.log(x.b.b.a) // 10
     * </pre>
     * @default false
     *
     */
    supportCircular?: boolean;
    /**
     * Whether to replace or concat arrays when merging
     * saved state with restored state
     * defaults to replacing arrays
     */
    mergeOption?: MergeOptionType;
}