import { Identity } from '../types';
/**
 * FileStorage is an {@link @spacehq/sdk#IdentityStorage} implementation that works in the browser.
 *
 * NOTE: This is experimental, you might want to roll your own IdentityStorage of early.
 *
 */
export declare class FileStorage {
    private filename;
    private identities;
    constructor(filename: string);
    private write;
    add(identity: Identity): Promise<void>;
    list(): Promise<Identity[]>;
    remove(key: string): Promise<void>;
}