/**
 * @license
 * Copyright 2026 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */
import { File } from '../code_executors/code_execution_utils.js';
/**
 * Writes `files` into `dir`, refusing any entry that resolves outside of it.
 *
 * `dir` is deliberately required and has no default: file names typically
 * originate from a code executor's output (i.e. from model- or skill-controlled
 * content), so the destination must be a dedicated directory chosen by the
 * caller. Defaulting to `process.cwd()` would let such content drop files into
 * the host application's working directory.
 *
 * @param files The files to materialize.
 * @param dir The directory to materialize the files into.
 */
export declare function materializeFiles(files: File[], dir: string): Promise<File[]>;
export declare const EXTENSION_TO_MIME_TYPE: Record<string, string>;
export declare function guessMimeType(filePath: string): string;