export declare class ValidationError extends Error {
    expected: unknown | undefined;
    actual: unknown | undefined;
    status: number;
    /**
     * Error thrown there there is a validation issue.
     * @param message Message describing the error.
     * @param expected expected value.
     * @param actual actual value.
     */
    constructor(message: string, expected: unknown | undefined, actual: unknown | undefined);
    toJSON(): string;
}