export default class PowerGuardError extends Error {
    guardType: string;
    value: unknown;
    optional: boolean;
    details?: string;
    constructor(guardType: string, value: unknown, optional: boolean, details?: string);
}
export declare class PowerGuardKeyError extends Error {
    key: string;
    gut: PowerGuardError;
    constructor(key: string, gut: PowerGuardError);
}