import { LibQCStorage } from './index';
/**
 * Web storage implementation of LibQCStorage using localStorage
 *
 * Stores and retrieves serialized values. Encryption is handled at the
 * state layer (see state.ts) rather than at the storage level.
 */
export declare class WebStorage implements LibQCStorage {
    private prefix;
    private storage;
    constructor(prefix?: string);
    /**
     * Get a value from storage based on a key
     *
     * @param key The key of the stored value
     * @returns The value in storage
     */
    get<V>(key: string): Promise<V | null>;
    /**
     * Puts a new value into storage
     *
     * @param key The key to store the value against
     */
    put<V>(key: string, value: V): Promise<void>;
    /**
     * Delete a value from storage
     *
     * @param key The key of the stored value
     */
    delete(key: string): Promise<void>;
    /**
     * Checks if storage has a stored value
     *
     * @param key The key of the stored value
     * @returns True if there is a value stored at the key and false otherwise
     */
    has(key: string): Promise<boolean>;
    /**
     * Clears all stored data
     *
     */
    clear(): Promise<void>;
    /**
     * Builds a storage key with a prefix
     *
     * @param key The key to prefix
     * @returns A storage key
     */
    private getKey;
}