Awesome

The Goal

This is HTML5 + ReactJS + CoffeeScript application, built with Brunch.

Raison d'Etre

I love React.js and I love CoffeeScript. But they aren't the most fun to use in concert. React has JSX, which is very cool (I even built react-brunch so I could use it with brunch.io), but it requires writing straight, tedious, javascript. Not ideal (For me anyway).

Really, I want what I perceive to be the best of both worlds, and to treat react components as classes (at least in definition, it gets me some nice editor/ide benefits).

By combining react-coffee with react-tags-brunch you can write the following example. It's clean and pretty (to my eyes).

class HeaderBar extends React.Component
  render: ->
    (@header null,
      (@h1 null, "My App")
    )

module.exports= HeaderBar.toComponent()

For The Curious

react-tags-brunch is a build-time plugin for brunch. It scans the source (as a String) and converts calls from this.TAG to React.DOM.TAG, but only if 'TAG' is actually a dom component defined in React.DOM.

The example above, after it's been run through brunch, looks like this:

var HeaderBar,
  __hasProp = {}.hasOwnProperty,
  __extends = function(child, parent) { for (var key in parent) { if (__hasProp.call(parent, key)) child[key] = parent[key]; } function ctor() { this.constructor = child; } ctor.prototype = parent.prototype; child.prototype = new ctor(); child.__super__ = parent.prototype; return child; };

HeaderBar = (function(_super) {
  __extends(HeaderBar, _super);

  function HeaderBar() {
    return HeaderBar.__super__.constructor.apply(this, arguments);
  }

  HeaderBar.prototype.render = function() {
    return React.DOM.header(null, React.DOM.h1(null, "My App"));
  };

  return HeaderBar;

})(React.Component);

module.exports = HeaderBar.toComponent();

react-coffee is a runtime micro-lib that will take the CoffeeScript class and convert it to a react component when toComponent is called. That's why the result of HeaderBar.toComponent() is what's exported from the module.

ES6

Interestingly, you can use JSX's harmony flag (enabled by default in this project) to generate ES6 classes and use react-coffee with it. Like this:

test.jsx:

// This will work with ES6 classes as well!
class Test extends React.Component {

  static message() {
    return "Hello, mate."
  }

  getInitialState() {
    return {
      hello: 'Howdy'
    }
  }

  render() {
    return (
      <div>
        You said: { this.type.message() }<br/>
        I said: { this.state.hello }
      </div>
    )
  }

}

module.exports= Test.toComponent()