mock-fs 4.3.0 broken on node 8

[AGrzes]

I'm using mock-fs in my tests and they fail on node 8.
I ran the module test suite and there is a lot of errors.
Attached the test log [email protected]

[AGrzes]

It looks like node 8 is throwing away the values provided to callback by mock-fs.

// Special case of `makeCallback()` that is specific to async `*stat()` calls as
// an optimization, since the data passed back to the callback needs to be
// transformed anyway.
function makeStatsCallback(cb) {
  if (cb === undefined) {
    return rethrow();
  }

  if (typeof cb !== 'function') {
    throw new TypeError('"callback" argument must be a function');
  }

  return function(err) {
    if (err) return cb(err);
    cb(err, statsFromValues());
  };
}

https://github.com/nodejs/node/blob/v8.0.0/lib/fs.js#L139-L155

[AGrzes]

Related issue #197 and PR nodejs/node#11665

[AGrzes]

Started work in #209

[tschaub]

Fix published in [email protected]. Thanks @AGrzes.