unsupported methods temporary commented

fetch/fetch.d.ts

@@ -51,9 +51,11 @@ declare module "fetch" {
 
     class Body {
         bodyUsed: boolean;
+/*
         arrayBuffer(): Promise<ArrayBuffer>;
         blob(): Promise<Blob>;
         formData(): Promise<FormData>;
+*/
         json(): Promise<any>;
         text(): Promise<string>;
     }