Function extractFile

tests/e2e/utils/tar.ts:21–48

(tarball: string, filePath: string)

 * @returns the Buffer of file or an error on fs/tar error or file not found
 */
export function extractFile(tarball: string, filePath: string): Promise<Buffer> {
  const normalizedFilePath = normalize(filePath);

  return new Promise((resolve, reject) => {
    const extractor = extract();

    extractor.on('entry', (header, stream, next) => {
      if (normalize(header.name) !== normalizedFilePath) {
        stream.resume();
        next();

        return;
      }

      const chunks: Buffer[] = [];
      stream.on('data', (chunk) => chunks.push(chunk));
      stream.on('error', reject);
      stream.on('end', () => {
        resolve(Buffer.concat(chunks));
        next();
      });
    });

    extractor.on('finish', () => reject(new Error(`'${filePath}' not found in '${tarball}'.`)));

    createReadStream(tarball).pipe(createGunzip()).pipe(extractor).on('error', reject);
  });
}