/**
 * Typed wrapper for the host files extension (`window.host.ext.files`).
 *
 * @example
 * ```ts
 * import { files } from "@polkadot-apps/product-sdk";
 *
 * // Save a text file
 * const b64 = btoa("Hello, world!");
 * await files.save("greeting.txt", b64);
 * ```
 */
/** Save a file. The data must be base64-encoded. */
export declare function save(filename: string, dataBase64: string): Promise<void>;
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