How to use the @polkadot/ui-keyring.addPair function in @polkadot/ui-keyring

function createAccount (source: KeyringPair, suri: string, name: string, password: string, success: string): ActionStatus {
  // we will fill in all the details below
  const status = { action: 'create' } as ActionStatus;

  try {
    const derived = source.derive(suri);

    derived.setMeta({ ...derived.meta, name, tags: [] });

    const result = keyring.addPair(derived, password || '');
    const { address } = result.pair;

    status.account = address;
    status.status = 'success';
    status.message = success;

    downloadAccount(result);
  } catch (error) {
    status.status = 'error';
    status.message = error.message;
  }

  return status;
}