https://github.com/jayphelps/sweet-async-await

Sweet.js macros to support the async/await ES7 proposed feature
https://github.com/jayphelps/sweet-async-await

Last synced: 16 days ago
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Sweet.js macros to support the async/await ES7 proposed feature

• Host: GitHub
• URL: https://github.com/jayphelps/sweet-async-await
• Owner: jayphelps
• License: mit
• Created: 2014-05-30T00:21:02.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2014-07-31T18:16:50.000Z (over 10 years ago)
• Last Synced: 2024-12-31T14:14:39.434Z (26 days ago)
• Language: JavaScript
• Size: 258 KB
• Stars: 36
• Watchers: 4
• Forks: 4
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
sweet-async-await

=================

[Sweet.js](http://sweetjs.org/) macros to support the async/await [ES7 proposed feature](https://github.com/lukehoban/ecmascript-asyncawait) for handling JavaScript [Promises](https://www.promisejs.org/)

***Probably incomplete and broken. Consider this an experiment at this point***

##### Input

```javascript

async function findPosts() {

  var response = await $.get('/posts');

  return JSON.parse(response.posts);

}

async function main() {

  console.log('starting...');

  

  var posts = await findPosts();

  posts.forEach(function (post) {

    console.log(post);

  });

  

  console.log('ending...');

}

main();

```

##### Output

```javascript

function findPosts() {

    var ctx = this, args = arguments;

    return Promise.resolve().then(function () {

        var response;

        return $.get('/posts').then(function (value) {

            response = value;

            return JSON.parse(response.posts);

        });

    });

}

function main() {

  var ctx = this, args = arguments;

  return Promise.resolve().then(function () {

    console.log('starting...');

    

    var posts;

    return findPosts().then(function (value) {

      posts = value;

      

      posts.forEach(function (post) {

        console.log(post);

      });

      

      console.log('ending...');

    });

  });

}

main();

```

### Goals

The primary end-goal is to output the same human readable code you would use if this didn't exist, instead of using a state machine like the [traceur-compiler](https://github.com/google/traceur-compiler) does; which is far less intuitive for debugging promise chains. Also, unlike traceur, there is **no runtime** library required. (unless you need to provide a Promise polyfill)