import { ScannedFile } from './types';
/**
 * File System API type definitions (browser non-standard API)
 */
declare global {
    interface FileSystemEntry {
        readonly isFile: boolean;
        readonly isDirectory: boolean;
        readonly name: string;
        readonly fullPath: string;
    }
    interface FileSystemFileEntry extends FileSystemEntry {
        readonly isFile: true;
        readonly isDirectory: false;
        file(successCallback: (file: File) => void, errorCallback?: (error: Error) => void): void;
    }
    interface FileSystemDirectoryEntry extends FileSystemEntry {
        readonly isFile: false;
        readonly isDirectory: true;
        createReader(): FileSystemDirectoryReader;
    }
    interface FileSystemDirectoryReader {
        readEntries(successCallback: (entries: FileSystemEntry[]) => void, errorCallback?: (error: Error) => void): void;
    }
    interface DataTransferItem {
        webkitGetAsEntry(): FileSystemEntry | null;
    }
}
/**
 * File Scanner
 * Scans files from different input sources, supports recursive folder traversal
 */
export declare class FileScanner {
    /**
     * Scan files
     * @param input Input source
     * @param onProgress Single file scan callback - called immediately for each scanned file
     * @param onComplete Scan complete callback - called once with all files and empty folders after scanning
     */
    static scan(input: FileList | File[] | DataTransferItemList, onProgress?: (file: ScannedFile) => void, onComplete?: (files: ScannedFile[], emptyDirs: ScannedFile[]) => void): Promise<ScannedFile[]>;
    /**
     * Check if input is DataTransferItemList
     */
    private static isDataTransferItemList;
    /**
     * Scan DataTransferItemList (drag and drop)
     * Optimized for parallel directory reading and faster processing
     */
    private static scanDataTransfer;
    /**
     * Scan FileList or File[]
     * For input[type=file] with webkitdirectory, files are already available with paths
     * No need for async scanning - process synchronously for maximum speed
     */
    private static scanFileList;
    /**
     * Read directory contents (with empty directory detection)
     * Optimized to read all batches in parallel
     */
    private static readDirectoryWithEmpty;
    /**
     * Extract directory path
     */
    private static extractDirectory;
    /**
     * Get file extension
     */
    private static getExtension;
}