export interface SecureStoreBackend {
    get(dbName: string, dbStoreName: string, key: string): Promise<any | null>;
    set(dbName: string, dbStoreName: string, key: string, value: any): Promise<boolean>;
    delete(dbName: string, dbStoreName: string, key: string): Promise<boolean>;
}
export declare const getDefaultSecureStoreBackend: () => SecureStoreBackend | null;
export declare function isIndexedDbAvailable(): boolean;
export declare class IndexedDbSecureStoreBackend implements SecureStoreBackend {
    private db;
    constructor();
    private openDB;
    get(dbName: string, dbStoreName: string, key: string): Promise<string | null>;
    set(dbName: string, dbStoreName: string, key: string, value: any): Promise<boolean>;
    delete(dbName: string, dbStoreName: string, key: string): Promise<boolean>;
}