import type { string_mime_type } from '../../types/string_mime_type';
import type { string_file_extension } from '../../types/string_sha256';
/**
 * Convert mime type to file extension
 *
 * Note: If the mime type is invalid, `null` is returned
 *
 * @private within the repository
 */
export declare function mimeTypeToExtension(value: string_mime_type): string_file_extension | null;