FileReader

interface FileReader  extends EventTarget {

readonly DONE: number;

readonly EMPTY: number;

readonly error: DOMException | null;

readonly LOADING: number;
onabort: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null;
onerror: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null;
onload: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null;
onloadend: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null;
onloadstart: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null;
onprogress: ((this: FileReader, ev: ProgressEvent<FileReader>) => any) | null;

readonly readyState: number;

readonly result: string | ArrayBuffer | null;
abort(): void;
addEventListener<K extends keyof FileReaderEventMap>(

type: K,

listener: (this: FileReader, ev: FileReaderEventMap[K]) => any,

options?: boolean | AddEventListenerOptions,
): void;
addEventListener(

type: string,

listener: EventListenerOrEventListenerObject,

options?: boolean | AddEventListenerOptions,
): void;
readAsArrayBuffer(blob: Blob): void;
readAsBinaryString(blob: Blob): void;
readAsDataURL(blob: Blob): void;
readAsText(blob: Blob, encoding?: string): void;
removeEventListener<K extends keyof FileReaderEventMap>(

type: K,

listener: (this: FileReader, ev: FileReaderEventMap[K]) => any,

options?: boolean | EventListenerOptions,
): void;
removeEventListener(

type: string,

listener: EventListenerOrEventListenerObject,

options?: boolean | EventListenerOptions,
): void;
}

var FileReader: {
prototype: FileReader; 
readonly DONE: number; 
readonly EMPTY: number; 
readonly LOADING: number; 
new (): FileReader; 
};