Add missing fetch types compatible with TS 2.6+ (#25255)

types/react-native/globals.d.ts

@@ -21,4 +21,95 @@ declare function requestAnimationFrame(callback: (time: number) => void): number
 
 declare function fetchBundle(bundleId: number, callback: (error?: Error | null) => void): void;
 
-declare function fetch(input: RequestInfo, init?: RequestInit): Promise<Response>;
+//
+// Fetch API
+//
+
+declare function fetch(input: Request | string, init?: RequestInit): Promise<Response>;
+
+interface Blob {}
+
+declare interface FormData {
+  append(name: string, value: any): void;
+}
+
+declare interface Body {
+  readonly bodyUsed: boolean;
+  arrayBuffer(): Promise<ArrayBuffer>;
+  blob(): Promise<Blob>;
+  json(): Promise<any>;
+  text(): Promise<string>;
+  formData(): Promise<FormData>;
+}
+
+declare interface Headers {
+  append(name: string, value: string): void;
+  delete(name: string): void;
+  forEach(callback: Function, thisArg?: any): void;
+  get(name: string): string | null;
+  has(name: string): boolean;
+  set(name: string, value: string): void;
+}
+
+declare var Headers: {
+  prototype: Headers;
+  new(init?: HeadersInit_): Headers;
+};
+
+type BodyInit_ = Blob | Int8Array | Int16Array | Int32Array | Uint8Array | Uint16Array | Uint32Array | Uint8ClampedArray | Float32Array | Float64Array | DataView | ArrayBuffer | FormData | string | null;
+
+declare interface RequestInit {
+  body?: BodyInit_;
+  credentials?: RequestCredentials_;
+  headers?: HeadersInit_;
+  integrity?: string;
+  keepalive?: boolean;
+  method?: string;
+  mode?: RequestMode_;
+  referrer?: string;
+  window?: any;
+}
+
+declare interface Request extends Object, Body {
+  readonly credentials: RequestCredentials_;
+  readonly headers: Headers;
+  readonly method: string;
+  readonly mode: RequestMode_;
+  readonly referrer: string;
+  readonly url: string;
+  clone(): Request;
+}
+
+declare var Request: {
+  prototype: Request;
+  new(input: Request | string, init?: RequestInit): Request;
+};
+
+declare interface ResponseInit {
+  headers?: HeadersInit_;
+  status?: number;
+  statusText?: string;
+}
+
+declare interface Response extends Object, Body {
+  readonly headers: Headers;
+  readonly ok: boolean;
+  readonly status: number;
+  readonly statusText: string;
+  readonly type: ResponseType_;
+  readonly url: string;
+  readonly redirected: boolean;
+  clone(): Response;
+}
+
+declare var Response: {
+  prototype: Response;
+  new(body?: BodyInit_, init?: ResponseInit): Response;
+  error: () => Response;
+  redirect: (url: string, status?: number) => Response;
+};
+
+type HeadersInit_ = Headers | string[][] | { [key: string]: string };
+type RequestCredentials_ = "omit" | "same-origin" | "include";
+type RequestMode_ = "navigate" | "same-origin" | "no-cors" | "cors";
+type ResponseType_ = "basic" | "cors" | "default" | "error" | "opaque" | "opaqueredirect";