/**
 * Trigger a browser file download by navigating to a URL.
 * Pass an optional filename to override the name suggested by the server or URL.
 * For Blob-based downloads, use `downloadBlob()` instead.
 */
export declare function downloadViaUrl(url: string, filename?: string): void;
/**
 * Trigger a browser file download from a Blob.
 * Creates a temporary object URL, triggers the download, then revokes the URL.
 */
export declare function downloadBlob(blob: Blob, filename: string): void;