react-native: Use number literals in TypeScript types for `FileReader…

…` and `XMLHttpRequest` states (#36000)

Summary:
Mostly to improve compat in codebases where `lib.dom.d.ts` is loaded alongside RN. TS 5.0 updates to `lib.dom.d.ts` added number literals for these states as well so the abstract `number` type from RN was no longer compatible.

Forward-port of DefinitelyTyped/DefinitelyTyped#64144

Underlying flow types:
- https://github.com/facebook/react-native/blob/v0.71.1/Libraries/Blob/FileReader.js#L33-L35
- https://github.com/facebook/react-native/blob/v0.71.1/Libraries/Network/XMLHttpRequest.js#L54-L58

## Changelog

[GENERAL] [CHANGED] - Use number literals in TypeScript types for `FileReader` and `XMLHttpRequest` states

Pull Request resolved: #36000

Test Plan: - [x] DefinitelyTyped/DefinitelyTyped#64144 green

Reviewed By: christophpurrer

Differential Revision: D42849886

Pulled By: jacdebug

fbshipit-source-id: c3cf2ac4f5f53ab889a9190583486da4627d3dcc

types/modules/globals.d.ts

@@ -260,11 +260,11 @@ interface XMLHttpRequest extends EventTarget, XMLHttpRequestEventTarget {
   overrideMimeType(mime: string): void;
   send(data?: any): void;
   setRequestHeader(header: string, value: string): void;
-  readonly DONE: number;
-  readonly HEADERS_RECEIVED: number;
-  readonly LOADING: number;
-  readonly OPENED: number;
-  readonly UNSENT: number;
+  readonly DONE: 4;
+  readonly HEADERS_RECEIVED: 2;
+  readonly LOADING: 3;
+  readonly OPENED: 1;
+  readonly UNSENT: 0;
   addEventListener<K extends keyof XMLHttpRequestEventMap>(
     type: K,
     listener: (this: XMLHttpRequest, ev: XMLHttpRequestEventMap[K]) => any,
@@ -280,11 +280,11 @@ interface XMLHttpRequest extends EventTarget, XMLHttpRequestEventTarget {
 declare var XMLHttpRequest: {
   prototype: XMLHttpRequest;
   new (): XMLHttpRequest;
-  readonly DONE: number;
-  readonly HEADERS_RECEIVED: number;
-  readonly LOADING: number;
-  readonly OPENED: number;
-  readonly UNSENT: number;
+  readonly DONE: 4;
+  readonly HEADERS_RECEIVED: 2;
+  readonly LOADING: 3;
+  readonly OPENED: 1;
+  readonly UNSENT: 0;
 };
 
 interface XMLHttpRequestEventTargetEventMap {
@@ -551,9 +551,9 @@ interface FileReader extends EventTarget {
   // readAsBinaryString(blob: Blob): void;
   readAsDataURL(blob: Blob): void;
   readAsText(blob: Blob, encoding?: string): void;
-  readonly DONE: number;
-  readonly EMPTY: number;
-  readonly LOADING: number;
+  readonly DONE: 2;
+  readonly EMPTY: 0;
+  readonly LOADING: 1;
   addEventListener<K extends keyof FileReaderEventMap>(
     type: K,
     listener: (this: FileReader, ev: FileReaderEventMap[K]) => any,
@@ -571,7 +571,7 @@ interface FileReader extends EventTarget {
 declare var FileReader: {
   prototype: FileReader;
   new (): FileReader;
-  readonly DONE: number;
-  readonly EMPTY: number;
-  readonly LOADING: number;
+  readonly DONE: 2;
+  readonly EMPTY: 0;
+  readonly LOADING: 1;
 };