async/await support

[mgenev]

I enabled async/await per this conversation koajs/koa#415
Everything's working, except when I get this module involved and switch my functions from generator to async, I start getting undefined is not a function coming out of this module, I suspect it's not async/await compliant?

[alexmingoia]

Works fine for me using babel. What are you using to transform?

[mgenev]

Babel as well, do you have an example where I can see it working? Mine is public
Works for all the other middleware, but if I switch these routes to async/await from */yield It breaks.
https://github.com/mgenev/nautilus/blob/async/server/controllers/post.js

Here is the babel setup:
https://github.com/mgenev/nautilus/blob/async/server/run.js

I also tried using 'asyncToGenerator' instead of bluebird, different error but also breaks...

[mgenev]

Just tried again, this works as intended:

import koa from 'koa';
var router = require('koa-router')();
let app = koa();

app.experimental = true;

router.get('/meh',  function* (next) {
  this.body = 'MEH MEH MEH';
});

app.use(router.routes()).use(router.allowedMethods());
app.server = app.listen(3000);

this:

import koa from 'koa';
var router = require('koa-router')();
let app = koa();

app.experimental = true;

router.get('/meh',  async function (next) {
  this.body = 'MEH MEH MEH';
});

app.use(router.routes()).use(router.allowedMethods());
app.server = app.listen(3000);

gives me error:

  TypeError: next[(intermediate value)] is not a function
      at Object.dispatch (/Users/martin.genev/Projects/temp/asynckoa/node_modules/koa-router/lib/router.js:331:14)
      at GeneratorFunctionPrototype.next (native)
      at Object.respond (/Users/martin.genev/Projects/temp/asynckoa/node_modules/koa/lib/application.js:180:10)
      at GeneratorFunctionPrototype.next (native)
      at onFulfilled (/Users/martin.genev/Projects/temp/asynckoa/node_modules/koa/node_modules/co/index.js:64:19)
      at /Users/martin.genev/Projects/temp/asynckoa/node_modules/koa/node_modules/co/index.js:53:5
      at Object.co (/Users/martin.genev/Projects/temp/asynckoa/node_modules/koa/node_modules/co/index.js:49:10)
      at Wrap.<anonymous> (/Users/martin.genev/Projects/temp/asynckoa/node_modules/koa/node_modules/composition/index.js:48:19)
      at Wrap.Object.defineProperty.get (/Users/martin.genev/Projects/temp/asynckoa/node_modules/koa/node_modules/composition/node_modules/memorizer/index.js:5:38)
      at Wrap.catch (/Users/martin.genev/Projects/temp/asynckoa/node_modules/koa/node_modules/composition/index.js:98:14)
      at Server.<anonymous> (/Users/martin.genev/Projects/temp/asynckoa/node_modules/koa/lib/application.js:128:23)
      at emitTwo (events.js:87:13)
      at Server.emit (events.js:169:7)
      at HTTPParser.parserOnIncoming [as onIncoming] (_http_server.js:471:12)
      at HTTPParser.parserOnHeadersComplete (_http_common.js:88:23)
      at Socket.socketOnData (_http_server.js:322:22)

my babel settings:

require('babel/register')({
  optional: ['asyncToGenerator']
});

versions:

    "koa": "^0.21.0",
    "koa-router": "^5.1.1"

What am I doing wrong? How were you able to get it to work?

[bernhardw]

It would be great to have (experimental) support for async functions through promises as well.

[geddski]

I'd like this as well 👍

[juhaelee]

👍

[mvila]

I am switching all my projects from ES6 generators to ES7 async functions... So, a big 👍 for me too!

[dvlsg]

👍 This functionality would get me to move all of my projects to koa as soon as it is available. Would be a fantastic feature.

[ujenjt]

👍 really need this feature

[niieani]

👍 Would be awesome.

[xmlking]

👍

[menems]

Hi everyone,

So as I understand this commit is for the experimetal option on koa master branch? not for the new signature proposal with ctx on params?

[alexmingoia]

The experimental option.