export declare class ExtractPdfError extends Error {
    code: string;
    details?: any;
    constructor(code: string, params?: string[], details?: any);
    toJSON(): {
        name: string;
        code: string;
        message: string;
        details: any;
    };
}
export declare class ValidationError extends ExtractPdfError {
    constructor(message: string, details?: any);
}
export declare class FileNotFoundError extends ExtractPdfError {
    constructor(filePath: string);
}
export declare class OcrError extends ExtractPdfError {
    constructor(message: string, details?: any);
}
export declare class ImageExtractionError extends ExtractPdfError {
    constructor(message: string, details?: any);
}
export declare class TableExtractionError extends ExtractPdfError {
    constructor(message: string, details?: any);
}
export declare class EnhancementError extends ExtractPdfError {
    constructor(message: string, details?: any);
}
export declare class LanguageDetectionError extends ExtractPdfError {
    constructor(message: string, details?: any);
}