import type { ProgressCallback } from "./types.mjs";
/**
* Wrap a `BodyInit` so each emitted chunk fires a progress event. Total
* size is computed when the body is a string, ArrayBuffer/ArrayBufferView,
* or Blob; otherwise total is undefined.
*
* Returns a `ReadableStream` plus the computed total. When streams aren't
* supported (no duplex), the caller should fall back to passing the body
* directly without progress events.
*/
export declare function progressUpload(body: BodyInit, callback: ProgressCallback, intervalMs?: number): Promise<{
	body: BodyInit;
	total: number | undefined;
}>;
/**
* Wrap a Response so iterating its body fires progress events. Returns a
* new Response with the wrapped stream; consume it like any other Response.
*/
export declare function progressDownload(response: Response, callback: ProgressCallback, intervalMs?: number): Response;
/** Whether the runtime supports half-duplex streamed request bodies. */
export declare function supportsRequestStreams(): boolean;