/**
 * Base class for all PostalCode related errors.
 */
export declare class PostalCodeError extends Error {
    readonly code: string;
    constructor(message: string, code: string);
}
/**
 * Error thrown when input validation fails.
 */
export declare class ValidationError extends PostalCodeError {
    constructor(message: string);
}
/**
 * Error thrown when communication with Pos Indonesia API fails.
 */
export declare class NetworkError extends PostalCodeError {
    readonly statusCode?: number | undefined;
    constructor(message: string, statusCode?: number | undefined);
}
/**
 * Error thrown when HTML parsing fails.
 */
export declare class ParseError extends PostalCodeError {
    constructor(message: string);
}
/**
 * Error thrown when no results are found (optional usage).
 */
export declare class NotFoundError extends PostalCodeError {
    constructor(message: string);
}
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