import { ConnectableObservable, Observable } from 'rxjs';
/**
 * Read a File/Blob and emit the data as ArrayBuffer.
 * If {chunkSize} is provided,
 * the data will be read in chunks and emitted as sequentially.
 *
 * If an error occurs while reading in chunks,
 * subsequent reads are aborted and the Observable throws.
 *
 * @param file
 * @param options
 *
 * @returns A cold Observable that only starts reading once it is subscribed to.
 * Any subsequent subscribers will share the same observable and replay the previous emitted chunks upon subscription.
 */
export declare function toArrayBuffer(file: File | Blob, options?: ReadOptions): Observable<ArrayBuffer>;
export declare type ReplayOperator = (source: Observable<ArrayBuffer>) => ConnectableObservable<ArrayBuffer>;
export interface ReadOptions {
    chunkSize?: number;
}
/**
 * Read File as text
 * @param file
 */
export declare function toString(file: File | Blob): Observable<string>;