declare module "ext:core/ops" {
  export type FetchMetadata = [
    status: number,
    statusText: string,
    headers: [name: string, value: string][],
    url: string,
    redirected: boolean,
    abandonedUpload: boolean,
  ];
  export type FetchSendArgs = [
    id: number,
    url: string,
    method: string,
    headers: [name: string, value: string][],
    bytes: Uint8Array<ArrayBuffer> | null,
    streaming: boolean,
    redirect: "follow" | "error" | "manual",
  ];
  export function op_fetch_base(): string;
  export function op_fetch_create(unit: null): number;
  export function op_fetch_cancel(id: number): null;
  export function op_fetch_send(args: FetchSendArgs): Promise<FetchMetadata>;
  export function op_fetch_read(id: number): Promise<Uint8Array<ArrayBuffer> | null>;
  export function op_fetch_read_all(id: number): Promise<Uint8Array<ArrayBuffer>>;
  export function op_fetch_write(args: [id: number, bytes: Uint8Array<ArrayBuffer> | null]): Promise<boolean>;
}