Callback result safety

[expwez]

Please, add some kind of a check for callback result, because I just miss to call return in my callback and it gave me an error kind of:

(node:16) UnhandledPromiseRejectionWarning: TypeError: Cannot read property 'getBufferAsync' of undefined
    at jimp__default.default.read.then.then.img (/srv/app/node_modules/gulp-jimp-wrapper/dist/index.js:35:24)
    at <anonymous>

The first thing I thought about it was that there is something wrong with the package, but, fortunately, there was not. After a little debugging I found out the reason was my own inaccuracy. It's not fatal, but I just would appreciate it if you add some checks and a more understandable exception for that.

Thank you for your time in advance.

[exuanbo]

Yes you're right, it's better to have some meaningful error messages.

I'll work on it.

[exuanbo]

Try the new version. 🤓

const processImage = async (img, cb, MIMEType) => {
  const res = await jimp.read(img.contents).then(cb)
  if (!(res instanceof jimp)) {
    throw new Error(
      'Jimp instance must be returned from the callback argument.'
    )
  }
  return res.getBufferAsync(MIMEType)
}

[expwez]

Works for me. Thank you