@kernel-js/auth/dist/interfaces/StorageInterface.d.ts

...

export default interface StorageInterface {
    /**
     * @returns object
     */
    get(): object;
    /**
     * @param  {object} data
     * @returns Promise
     */
    store(data: object): Promise<any>;
    /**
     * @returns Promise
     */
    revoke(): Promise<any>;
}