Q's makeNodeResolver() analogue

[zowers]

need something like Q's makeNodeResolver() - to pass a deferred to a Node callback https://github.com/kriskowal/q/blob/master/q.js#L608

[medikoo]

Is it about node function that takes async function as one of its arguments? Can you clarify with example, or link the documentation of such?

[zowers]

as per Q's doc https://github.com/kriskowal/q#adapting-node

Finally, if you're working with raw deferred objects, there is a makeNodeResolver method on deferreds that can be handy:

var deferred = Q.defer();
FS.readFile("foo.txt", "utf-8", deferred.makeNodeResolver());
return deferred.promise;

[medikoo]

In deferred there's promisify for that. Out of given async function it creates one that returns promise:

return deferred.promisify(FS.readFile)("foo.txt", "utf-8");

It's nicer approach, as once you create a wrapper, you may reuse it as many times you like. Thanks to that you can construct very readable flows:

var readFile = deferred.promisify(FS.readFile);

// Return content of two files joined
return deferred(readFile('foo.txt', 'utf-8'), readFile('bar.txt', 'utf-8')).invoke('join', '');

I'm closing it for now, but if for some reason it's still not solution you're looking for let me know.