promisification

I notice that in IncomingForm.parse(), the callback function is not returned, simply run. this makes promisification impossible, as far as I know. Is there a reason why the callbacks are not returned?

Right now I would like to get a return value out of the parse(), since the callback does fit the standard node callback format (function(err, [args...])). I need to use the result of the parse in another module which I cannot modify…

If changing the code to be return cb(err, fields, files) is not a possibility, is there a way to mimic a return value?

thanks!

[tunnckoCore]

You can’t return from callbacks which is normal. If you want you can create promise wrapper for formidable if there’s no one already.

Something like

function formidablePromise (req, opts) {
  return new Promise(function (resolve, reject) {
    var form = new formidable.IncomingForm(opts)
    form.parse(req, function (err, fields, files) {
      if (err) return reject(err)
      resolve({ fields: fields, files: files })
    })
  })
}

[GrosSacASac]

It looks resolved 😃