export declare class AppError extends Error {
    message: string;
    statusCode: number;
    code: string;
    constructor(message: string, statusCode?: number, code?: string);
}
export declare class NotFoundError extends AppError {
    constructor(message: string);
}
export declare class RateLimitError extends AppError {
    constructor(message?: string);
}
export declare class ValidationError extends AppError {
    constructor(message: string);
}
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