/**
 * Các hằng số và mã lỗi cho ExtractPdfNode
 */
export declare const ERROR_CODES: {
    FILE_NOT_FOUND: string;
    INVALID_BINARY: string;
    INVALID_PAGE_RANGE: string;
    OCR_FAILED: string;
    IMAGE_EXTRACTION_FAILED: string;
    TABLE_EXTRACTION_FAILED: string;
    ENHANCEMENT_FAILED: string;
    LANGUAGE_DETECTION_FAILED: string;
};
export declare const ERROR_MESSAGES: {
    [x: string]: string;
};
export declare const DEFAULT_VALUES: {
    OCR_LANGUAGE: string;
    IMAGE_QUALITY: string;
    IMAGE_FORMAT: string;
    TABLE_FORMAT: string;
    ENHANCEMENT_LEVEL: string;
    MIN_TEXT_LENGTH: number;
    MAX_RETRY_ATTEMPTS: number;
    CHUNK_SIZE: number;
    DPI: {
        low: number;
        medium: number;
        high: number;
    };
    SCALE: {
        low: number;
        medium: number;
        high: number;
    };
};
export declare const SUPPORTED_LANGUAGES: {
    code: string;
    name: string;
}[];
export declare const TEMP_FILE_PREFIX = "n8n_pdf_extract_";