How to use the @parcel/fs.ncp function in @parcel/fs

export async function ncp(source: FilePath, destination: FilePath) {
  await _ncp(inputFS, source, outputFS, destination);
}

async installPackage(
    packageName: string,
    fs: FileSystem,
    packagePath: FilePath,
  ) {
    let pkg = this.packages.get(packageName);
    if (!pkg) {
      throw new Error('Unknown package ' + packageName);
    }

    let dest = path.join(
      path.dirname(packagePath),
      'node_modules',
      packageName,
    );
    await ncp(pkg.fs, pkg.packagePath, fs, dest);

    let packageJSON = JSON.parse(
      await fs.readFile(path.join(dest, 'package.json'), 'utf8'),
    );
    let deps = packageJSON.dependencies || {};
    for (let dep in deps) {
      await this.installPackage(dep, fs, packagePath);
    }

    return packageJSON.version;
  }
}