import { Observable } from 'rxjs';
/**
 * Abstraction layer for handling the webkit file system.
 * This is not yet a standard spec, but is supported on both Edge and Chrome.
 */
export declare class WebkitFileSystem {
    private items;
    /**
     * Temporary solution to indicating a file object is actually a directory without fully implementing folder upload support.
     */
    static isDirectoryPropertyName: string;
    constructor(items: DataTransferItemList);
    getFileList(): Observable<File[]>;
    private toFileList;
    private getFilesFromEntry;
    private getFile;
    private getDirectory;
    private readAllEntries;
    private readEntries;
}