export declare abstract class CustomError<T extends string | number> extends Error {
    name: string;
    code: T;
    constructor(name: string, code: T);
}
export declare class BackendHttpError extends CustomError<number> {
    data?: unknown;
    constructor(code: number, data?: unknown);
}
export declare class BackendPaginationError extends CustomError<"tooLow" | "notANumber"> {
    constructor(code: "tooLow" | "notANumber");
}