import { IStorage } from './storage.interface';
/**
 * A storage type which stored values in memory.  They are assumed to be mutable, but
 * any object will work in this storage type.
 *
 * @export
 * @class MemoryStorage
 * @implements {IStorage}
 *
 * @author Scott O'Bryan
 * @since 1.0
 */
export declare class MemoryStorage implements IStorage {
    private _data;
    /**
     * Always returns true
     *
     * @returns {boolean}
     */
    available(): boolean;
    /**
     * Sets a value in this object for the specified key
     *
     * @param {string} key
     * @param {*} value
     * @returns {boolean}
     */
    set(key: string, value: any): boolean;
    /**
     * Returns the value of the specified key
     *
     * @param {string} key
     * @returns
     */
    get(key: string): any;
    /**
     * Returns false if the value for the key is undefined.
     *
     * @param {*} key
     * @returns {boolean}
     */
    exists(key: any): boolean;
    /**
     * Removes a value from this object
     *
     * @param {*} key
     */
    remove(key: any): void;
    /**
     * Removes all values in this storage type.
     *
     * @returns {string[]}
     */
    removeAll(): string[];
    /**
     * Returns a list of all keys that are stored
     *
     * @returns {string[]}
     */
    keys(): string[];
}