Support coffeescript 2 - Githubissues

toovy commented 7 years ago

Hi there,

Coffeescript 2 is getting real: http://coffeescript.org/v2/ (https://github.com/coffeescript6/discuss/issues/80).

It supports many ES2015 features. The reason why I would love to see it in ember is the async/await and generator support. The most important reason though is that the nasty import/export hacks using backticks to write plain JS is not needed any more:

export default Ember.Route.extend

  model: ->
    @foo()

  foo: ->
    a = await @bar()
    b = await @biz()
    "#{a}-#{b}"

  bar: ->
    new Ember.RSVP.Promise (resolve) ->
      setTimeout ->
        resolve("baz")
      , 2000

  biz: ->
    new Ember.RSVP.Promise (resolve) ->
      setTimeout ->
        resolve("biz")
      , 2000

I've made a quick test and it is simple to get it running by altering only a few lines of ember-cli-coffeescript and broccoli-coffee:

update the package.json, remove coffee-script, add coffeescript
update every require('coffee-script') to require('coffeescript')

But I think this needs more discussion on a meta level, as Coffeescript 1 runs in every browser, but Coffeescript 2 needs transpilation. Thankfully Ember includes Babel, so that is also pretty easy to accomplish:

var app = new EmberApp(defaults, {
    'ember-cli-babel': {
      includePolyfill: true
    }
  });

That's the reason why I did not just create pull requests. Maybe new repos should be created, called ember-cli-coffeescript-2 and babel-coffee-2? That would ensure that there is a clear distinction between old Coffeescript (1) and ES2015 Coffeescript (2).

Looking forward to hear your opinions.

BR, toovy