import { NgZone, OnDestroy } from '@angular/core';
import { Observable, Subject } from 'rxjs';
import * as i0 from "@angular/core";
export interface FileReaderError {
    entryName: string;
    error: string;
    errorMessage: string;
}
export declare class FileReaderService implements OnDestroy {
    private readonly _ngZone;
    private readonly _fileError$;
    private readonly _files$;
    private readonly _destroyed$;
    constructor(_ngZone: NgZone);
    ngOnDestroy(): void;
    get files$(): Observable<File[]>;
    get error$(): Subject<FileReaderError>;
    processDroppedItems(e: DragEvent): void;
    processFilesFromFileList(filesReceived: FileList, ignoreFoldersOrEmptyFiles?: boolean): void;
    private _processDroppedFolders;
    private _isFolderUploadSupported;
    private _addFileFromEntry;
    private _traverseFileTree;
    private _readAndEmitEntries;
    static ɵfac: i0.ɵɵFactoryDeclaration<FileReaderService, never>;
    static ɵprov: i0.ɵɵInjectableDeclaration<FileReaderService>;
}