Definition
Fetch Standard defines Body
interface mixin Body {
readonly attribute ReadableStream? body;
readonly attribute boolean bodyUsed;
[NewObject] Promise<ArrayBuffer> arrayBuffer();
[NewObject] Promise<Blob> blob();
[NewObject] Promise<Uint8Array> bytes();
[NewObject] Promise<FormData> formData();
[NewObject] Promise<any> json();
[NewObject] Promise<USVString> text();
};