/**
 * Whether `viewer` may manage this device's own settings: it is the device's identity or the
 * device's current controller. A missing viewer or an unresolvable controller grants nothing.
 */
export declare function isDeviceOwner(viewer: string | null | undefined, deviceDID: string, resolveDeviceController: () => Promise<string | null>): Promise<boolean>;
/** Custody and local storage choices are this device's own: only its owner makes them. */
export declare class DeviceOwnerRequiredError extends Error {
    get code(): string;
    constructor();
}