const register = async params => {
  const verifyParams = await verify(params);
  const passwordMatch = await passwordCheck(params);
  const user = await createUser(params);
  return { verifyParams, passwordMatch, user };
};

register({
  username: 'moosch',
  password: 'terryfolds',
  confPassword: 'terryfolds',
})
  .then(data => { // returns the object from line 5
    return data.user;
  })
  .catch(error => {
    throw new Error(error);
  });