/**
 * Extract files from a gzip-compressed tar archive.
 *
 * Parses the POSIX ustar format used by GitHub tarball downloads. Only
 * regular files whose path passes the `filter` function are included in the
 * result. File content is decoded as UTF-8.
 *
 * @param buffer  Complete `.tar.gz` content.
 * @param filter  Predicate receiving the full archive path — return `true` to
 *                include the file in the output map.
 * @returns Map from archive path → file content (UTF-8).
 */
export declare function extractTarGz(buffer: Buffer, filter: (path: string) => boolean): Promise<Map<string, string>>;
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