[feature-request] async/await methods in Vue 2.0

[nickmessing]

Hey, starting with koa on back-end, a lot of stuff are moving to async/await (*/yield for now), what I suggest is adding async/await functions support to methods so it's allowed to do like:

import DBService from './db'
new Vue({
  el: document.body,
  data: {
    user: {},
    friends: []
  },
  methods: {
    async getUserData () {
      this.user = await DBService.getUser()
      this.friends = await DBService.getFriends(this.user.id)
    }
  }
})

This looks like a cleaner way of doing async stuff to me, what do you think?

P.S. Same can be used for Vuex actions.

[nicolasparada]

And you can't?
I didn't test it, but I think you can.

Just remember that methods is an object, so it should be:

import DBService from './db'
new Vue({
  el: document.body,
  data: {
    user: {},
    friends: []
  },
  methods: {
    getUserData: async function() {
      this.user = await DBService.getUser()
      this.friends = await DBService.getFriends(this.user.id)
    }
  }
})

Same for actions. It's mentioned here https://github.com/vuejs/vuex/releases/tag/v2.0.0-rc.1

[nickmessing]

@nicolasparada, sorry, I don't know why but I was thinking that async functions get called only when you call .then on them. My bad.

[nickmessing]

@nicolasparada, btw, my notation is shortand just like:

var a = {
  myFunction () {},
  async myAsyncFunction () {}
}

[nicolasparada]

I know, you can't use the short-hand syntax together with async.

var a = {
  myFunction () {},
  myAsyncFunction: async function () {}
}

[nickmessing]

@nicolasparada, you can https://babeljs.io/repl/#?evaluate=true&lineWrap=false&presets=es2015%2Creact%2Cstage-2&code=a%20%3D%20%7B%0A%20%20async%20hello%20()%20%7B%0A%20%20%20%20%0A%20%20%7D%0A%7D

[itsMapleLeaf]

If you use babel-preset-stage-3 (or earlier) and babel-plugin-transform-runtime, it actually works fine. I had some async functions running in my project for a while.

[nicolasparada]

Yeah, you can.
Sorry, my bad. I don't know why I thought that.

[nicolasparada]

https://gist.github.com/NicolasParada/5e55e4c26bc2a40e6700a45408c14513
The one that doesn't is computed.

[nickmessing]

@nicolasparada, I dont' think it is possible to implement async/await in computed because it's extremely hard to track changes on async functions, you can't predict that function calls after "await" have changed.

[Cobertos]

You can have async in computed, now. There's a module for it.