promise.js

async function updateUser(token) {
  let cancelled = false;

  // we don't reject, since we don't have access to
  // the returned promise
  // so we just don't call other functions, and reject
  // in the end
  token.cancel = () => {
    cancelled = true;
  };

  const data = await wrapWithCancel(fetchData)();
  const userData = await wrapWithCancel(updateUserData)(data);
  const userAddress = await wrapWithCancel(updateUserAddress)(userData);
  const marketingData = await wrapWithCancel(updateMarketingData)(userAddress);

  // because we've wrapped all functions, in case of cancellations
  // we'll just fall through to this point, without calling any of
  // actual functions. We also can't reject by ourselves, since
  // we don't have control over returned promise
  if (cancelled) {
    throw { reason: 'cancelled' };
  }

  return marketingData;

  function wrapWithCancel(fn) {
    return data => {
      if (!cancelled) {
        return fn(data);
      }
    }
  }
}

const token = {};
const promise = updateUser(token);
// wait some time...
token.cancel(); // user will be updated any way