export declare class NotFoundError extends Error {
    constructor(dataType: string, id: number | string);
}
export declare class ValidationError extends Error {
    constructor(field: string, value: unknown, message: string);
}
export declare class FileOperationError extends Error {
    constructor(path: string, operation: string, cause?: Error);
}
export declare class ExternalServiceError extends Error {
    constructor(service: string, endpoint: string, cause?: Error);
}