export declare class Storage {
    config: StorageConfigInterface;
    key: StorageKey;
    ready: boolean;
    methods: StorageMethodsInterface;
    /**
     * A Storage is an interface to an external Storage,
     * and allows the easy interaction with that Storage.
     *
     * Due to the Storage, AgileTs can easily persist its Instances in almost any Storage
     * without a huge overhead.
     *
     * @public
     * @param config - Configuration object
     */
    constructor(config: CreateStorageConfigInterface);
    /**
     * Returns a boolean indicating whether the Storage is valid
     * and can be used to persist Instances in it or not.
     *
     * @public
     */
    validate(): boolean;
    /**
     * Synchronously retrieves the stored value
     * at the specified Storage Item key from the external Storage.
     *
     * When the retrieved value is a JSON-String it is parsed automatically.
     *
     * @public
     * @param key - Key/Name identifier of the value to be retrieved.
     */
    normalGet<GetTpe = any>(key: StorageItemKey): GetTpe | undefined;
    /**
     * Asynchronously retrieves the stored value
     * at the specified Storage Item key from the external Storage.
     *
     * When the retrieved value is a JSON-String it is parsed automatically.
     *
     * @public
     * @param key - Key/Name identifier of the value to be retrieved.
     */
    get<GetTpe = any>(key: StorageItemKey): Promise<GetTpe | undefined>;
    /**
     * Stores or updates the value at the specified Storage Item key
     * in the external Storage.
     *
     * @public
     * @param key - Key/Name identifier of the value to be stored or updated.
     * @param value - Value to be stored.
     */
    set(key: StorageItemKey, value: any): void;
    /**
     * Removes the value at the specified Storage Item key
     * from the external Storage.
     *
     * @public
     * @param key - Key/Name identifier of the value to be removed.
     */
    remove(key: StorageItemKey): void;
    /**
     * Generates and returns a valid Storage key based on the specified key.
     *
     * @internal
     * @param key - Key to be converted into a valid Storage key.
     */
    getStorageKey(key: StorageItemKey): string;
}
export declare type StorageKey = string | number;
export declare type StorageItemKey = string | number;
export interface CreateStorageConfigInterface extends StorageConfigInterface {
    /**
     * Key/Name identifier of the Storage.
     * @default undefined
     */
    key: string;
    /**
     * Storage methods for interacting with the external Storage.
     * @default undefined
     */
    methods: StorageMethodsInterface;
}
export interface StorageMethodsInterface {
    /**
     * Method to retrieve a value at the specified key from the external Storage.
     *
     * @param key - Key/Name identifier of the value to be retrieved.
     */
    get: (key: string) => any;
    /**
     * Method to store or update a value at the specified key in the external Storage.
     *
     * @param key - Key/Name identifier of the value to be stored or updated.
     * @param value - Value to be stored.
     */
    set: (key: string, value: any) => void;
    /**
     * Method to remove a value at the specified key from the external Storage.
     *
     * @param key - Key/Name identifier of the value to be removed.
     */
    remove: (key: string) => void;
}
export interface StorageConfigInterface {
    /**
     * Whether the external Storage represented by the Storage Class works async.
     * @default Automatically detected via the `isAsyncFunction()` method
     */
    async?: boolean;
    /**
     * Prefix to be added before each persisted value key/name identifier.
     * @default 'agile'
     */
    prefix?: string;
}