import type { Agile } from '../agile';
import { Persistent } from './persistent';
import { Storage, StorageItemKey, StorageKey } from './storage';
export declare class Storages {
    agileInstance: () => Agile;
    config: StoragesConfigInterface;
    storages: {
        [key: string]: Storage;
    };
    persistentInstances: {
        [key: string]: Persistent;
    };
    /**
     * The Storages Class manages all external Storages for an Agile Instance
     * and provides an interface to easily store,
     * load and remove values from multiple Storages at once.
     *
     * @internal
     * @param agileInstance - Instance of Agile the Storages belongs to.
     * @param config - Configuration object
     */
    constructor(agileInstance: Agile, config?: CreateStoragesConfigInterface);
    /**
     * Instantiates and registers the
     * [Local Storage](https://developer.mozilla.org/de/docs/Web/API/Window/localStorage).
     *
     * Note that the Local Storage is only available in a web environment.
     *
     * @internal
     */
    instantiateLocalStorage(): boolean;
    /**
     * Registers the specified Storage with AgileTs
     * and updates the Persistent Instances that have already attempted
     * to use the previously unregistered Storage.
     *
     * @public
     * @param storage - Storage to be registered with AgileTs.
     * @param config - Configuration object
     */
    register(storage: Storage, config?: RegisterConfigInterface): boolean;
    /**
     * Retrieves a single Storage with the specified key/name identifier
     * from the Storages Class.
     *
     * If the to retrieve Storage doesn't exist, `undefined` is returned.
     *
     * @public
     * @param storageKey - Key/Name identifier of the Storage.
     */
    getStorage(storageKey: StorageKey | undefined | null): Storage | undefined;
    /**
     * Retrieves the stored value at the specified Storage Item key
     * from the defined external Storage (`storageKey`).
     *
     * When no Storage has been specified,
     * the value is retrieved from the default Storage.
     *
     * @public
     * @param storageItemKey - Key/Name identifier of the value to be retrieved.
     * @param storageKey - Key/Name identifier of the external Storage
     * from which the value is to be retrieved.
     */
    get<GetType = any>(storageItemKey: StorageItemKey, storageKey?: StorageKey): Promise<GetType | undefined>;
    /**
     * Stores or updates the value at the specified Storage Item key
     * in the defined external Storages (`storageKeys`).
     *
     * When no Storage has been specified,
     * the value is stored/updated in the default Storage.
     *
     * @public
     * @param storageItemKey - Key/Name identifier of the value to be stored.
     * @param value - Value to be stored in an external Storage.
     * @param storageKeys - Key/Name identifier of the external Storage
     * where the value is to be stored.
     */
    set(storageItemKey: StorageItemKey, value: any, storageKeys?: StorageKey[]): void;
    /**
     * Removes the value at the specified Storage Item key
     * from the defined external Storages (`storageKeys`).
     *
     * When no Storage has been specified,
     * the value is removed from the default Storage.
     *
     * @public
     * @param storageItemKey - Key/Name identifier of the value to be removed.
     * @param storageKeys - Key/Name identifier of the external Storage
     * from which the value is to be removed.
     */
    remove(storageItemKey: StorageItemKey, storageKeys?: StorageKey[]): void;
    /**
     * Returns a boolean indicating whether any Storage
     * has been registered with the Agile Instance or not.
     *
     * @public
     */
    hasStorage(): boolean;
    /**
     * Returns a boolean indication whether the
     * [Local Storage](https://developer.mozilla.org/de/docs/Web/API/Window/localStorage)
     * is available in the current environment.
     *
     * @public
     */
    static localStorageAvailable(): boolean;
}
export interface CreateStoragesConfigInterface {
    /**
     * Whether to register the Local Storage by default.
     * Note that the Local Storage is only available in a web environment.
     * @default false
     */
    localStorage?: boolean;
    /**
     * Key/Name identifier of the default Storage.
     *
     * The default Storage represents the default Storage of the Storages Class,
     * on which executed actions are performed if no specific Storage was specified.
     *
     * Also, the persisted value is loaded from the default Storage by default,
     * since only one persisted value can be applied.
     * If the loading of the value from the default Storage failed,
     * an attempt is made to load the value from the remaining Storages.
     *
     * @default undefined
     */
    defaultStorageKey?: StorageKey;
}
export interface StoragesConfigInterface {
    /**
     * Key/Name identifier of the default Storage.
     *
     * The default Storage represents the default Storage of the Storages Class,
     * on which executed actions are performed if no specific Storage was specified.
     *
     * Also, the persisted value is loaded from the default Storage by default,
     * since only one persisted value can be applied.
     * If the loading of the value from the default Storage failed,
     * an attempt is made to load the value from the remaining Storages.
     *
     * @default undefined
     */
    defaultStorageKey: StorageKey | null;
}
export interface RegisterConfigInterface {
    /**
     * Whether the to register Storage should become the default Storage.
     *
     * The default Storage represents the default Storage of the Storages Class,
     * on which executed actions are performed if no specific Storage was specified.
     *
     * Also, the persisted value is loaded from the default Storage by default,
     * since only one persisted value can be applied.
     * If the loading of the value from the default Storage failed,
     * an attempt is made to load the value from the remaining Storages.
     *
     * @default false
     */
    default?: boolean;
}