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node.jsmongoosebluebird

How to promisify a regular function that I created with NodeJS Bluebird?

I tested Bluebird for the first time with Mongoose method calls. It was very easy, just had to do something like Promise.promisifyAll(myObj) and then call myObj.methodAsync

But when I tried to implement it without Mongoose, I didn't know what to do, for example:

function Foo(){}

Foo.prototype.test = function(c,cb){
  cb(new Error(),{a:1, b:2, c:c});
};

module.exports = new Foo();

This throws this error in then.

Unhandled rejection (<{"a":1,"b":2,"c":true}>, no stack trace).

This is going to catch, and there I can use it without errors.

Anyone knows how to implement my method to work well with a promise implementation?

Solution

  • Your call back is returning new Error(), just use cb(null, {a:1, b:2,c:c});