/**
 * File content processing options
 */
export interface FileContentProcessorOptions {
    /** Requested output format: 'auto' (smart detection), 'text', 'base64', 'raw' */
    format?: 'auto' | 'text' | 'base64' | 'raw';
    /** Maximum file size to process (in bytes) */
    maxFileSize?: number;
    /** Whether to include extraction warnings */
    includeWarnings?: boolean;
}
/**
 * Result of file content processing
 */
export interface FileContentProcessorResult {
    /** Processed content */
    content: string;
    /** Detected/processed format */
    format: string;
    /** Original content type */
    contentType: string;
    /** File size in bytes */
    size: number;
    /** Extraction method used */
    extractionMethod: string;
    /** Optional warning message */
    warning?: string;
    /** Processing success status */
    success: boolean;
    /** Error message if processing failed */
    error?: string;
}
/**
 * Reusable file content processor for Form Builders actions
 * Handles intelligent content extraction from various file formats
 */
export declare class FileContentProcessor {
    private static readonly DEFAULT_MAX_FILE_SIZE;
    /**
     * Process file content based on content type and requested format
     */
    static processContent(buffer: Buffer, contentType: string, options?: FileContentProcessorOptions): Promise<FileContentProcessorResult>;
    /**
     * Intelligent content extraction based on file type
     */
    private static intelligentProcessing;
    /**
     * Check if content type is an image format
     */
    private static isImage;
    /**
     * Check if content type is a text-based format
     */
    private static isTextFormat;
    /**
     * Check if content type is PDF
     */
    private static isPDF;
    /**
     * Check if content type is Excel
     */
    private static isExcel;
    /**
     * Check if content type is Word
     */
    private static isWord;
    /**
     * Extract filename from URL or Content-Disposition header
     */
    static extractFilename(fileUrl: string, contentDisposition?: string): string;
    /**
     * Get content format description for easy processing
     */
    static getContentFormat(contentType: string): string;
}
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