import type { WretchAddon, WretchResponseChain } from "../types.js";
export interface ProgressResolver {
    /**
     * Provides a way to register a callback to be invoked one or multiple times during the download.
     * The callback receives the current progress as two arguments, the number of bytes loaded and the total number of bytes to load.
     *
     * _Under the hood: this method adds a middleware to the chain that will intercept the response and replace the body with a new one that will emit the progress event._
     *
     * ```js
     * import ProgressAddon from "wretch/addons/progress"
     *
     * wretch("some_url")
     *   // Register the addon
     *   .addon(ProgressAddon())
     *   .get()
     *   // Log the progress as a percentage of completion
     *   .progress((loaded, total) => console.log(`${(loaded / total * 100).toFixed(0)}%`))
     * ```
     *
     * @param onProgress - A callback that will be called one or multiple times with the number of bytes loaded and the total number of bytes to load.
     */
    progress: <T, C extends ProgressResolver, R>(this: C & WretchResponseChain<T, C, R>, onProgress: (loaded: number, total: number) => void) => this;
}
/**
 * Adds the ability to monitor progress when downloading a response.
 *
 * _Compatible with all platforms implementing the [TransformStream WebAPI](https://developer.mozilla.org/en-US/docs/Web/API/TransformStream#browser_compatibility)._
 *
 * ```js
 * import ProgressAddon from "wretch/addons/progress"
 *
 * wretch("some_url")
 *   // Register the addon
 *   .addon(ProgressAddon())
 *   .get()
 *   // Log the progress as a percentage of completion
 *   .progress((loaded, total) => console.log(`${(loaded / total * 100).toFixed(0)}%`))
 * ```
 */
declare const progress: () => WretchAddon<unknown, ProgressResolver>;
export default progress;