Using an AsyncFunction as the iteratee function results in iteratee being passed as undefined

[JustinBeaudry]

What version of async are you using?
2.5.0

Which environment did the issue occur in (Node version/browser version)
OS Version: OS X 10.12.6
Node Version: 8.4.0
Browser Version: N/A

What did you do?

// templateNames is an array of strings
async.map(templateNames, async (templateName, next) => {   
  let template;
  try {
    template = await utils.getFile(templateName);
  } catch(err) {
    next(err);
  }
...
// and so on

What did you expect to happen?
next is an iteratee function

What was the actual result?
next is undefined

---

I ended up just using the .then().catch() syntax to accomplish my goal but still wanted to share that using an AsyncFunction (NOTE: this is not the async definition but the native AsyncFunction Object) results in the iteratee (next) being of type undefined.

[aearly]

async functions are treated differently as of 2.3.0 -- they are not passed a callback. Instead, just return a value (or Promise). In fact, in your example, even the try/catch is not necessary because any errors thrown will be caught by Async. This should simplify your code a bit.

// templateNames is an array of strings
async.map(templateNames, async templateName => {   
  const template = await utils.getFile(templateName);
...
// and so on

AsyncFunction docs: http://caolan.github.io/async/global.html

[JustinBeaudry]

🤦‍♂️ Reading that portion of the docs more clearly would have been smart. Thanks.

[aearly]

In fairness, that description is not that obvious on the docs site... 🙄 📜

[JustinBeaudry]

I actually think it's pretty clear. I glanced over the docs initially and missed that portion.