code: function installCb(err) {
    if (err) {
      console.log(`${C.errorText} ${err.message}`);
      process.exit(1);
    }
    let successMessage = `${C.successText} ${packageName}
    and its peerDeps were installed successfully.`;
    if (program.onlyPeers) {
      successMessage = `${
        C.successText
      } The peerDeps of ${packageName} were installed successfully.`;
    }
    console.log(successMessage);
    process.exit(0);
  }
docs: Callback which is called after the installation
  process finishes
  @callback
  @param {Error} [err] - the error, if any, that occurred during installation