import { Context } from "../core/context.js";
/**
 * Middleware that adds a `download` helper method to the context.
 *
 * The `ctx.download(filePath, filename?)` method allows controllers to easily send files
 * as downloadable attachments to the client. It sets appropriate headers, streams the file,
 * and handles errors if the file does not exist or streaming fails.
 *
 * @returns An async middleware function that augments the context with a `download` method.
 *
 * @example
 * // Usage in a route
 * router.get('/download/:file', async (ctx) => {
 *   await ctx.download(`/files/${ctx.params.file}`);
 * });
 */
export declare function downloadHelperMiddleware(): (ctx: Context, next: Function) => Promise<void>;
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