/** Base error for all USPS SDK errors */
export declare class USPSError extends Error {
    readonly statusCode?: number;
    readonly responseBody?: unknown;
    constructor(message: string, statusCode?: number, responseBody?: unknown);
}
/** OAuth or Payment Authorization failure */
export declare class AuthError extends USPSError {
    constructor(message: string, statusCode?: number, responseBody?: unknown);
}
/** Invalid request parameters */
export declare class ValidationError extends USPSError {
    readonly field?: string;
    constructor(message: string, field?: string);
}
/** USPS rate limit exceeded (429) */
export declare class RateLimitError extends USPSError {
    readonly retryAfter?: number;
    constructor(message?: string, retryAfter?: number);
}
/** USPS API returned an error response */
export declare class APIError extends USPSError {
    constructor(message: string, statusCode?: number, responseBody?: unknown);
}
/** Network/transport error (timeout, DNS, connection refused) */
export declare class NetworkError extends USPSError {
    constructor(message: string);
}
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