Proof of concept: Load controller via ES6 module in Discourse

.jshintrc

@@ -72,5 +72,6 @@
   "white": false,
   "eqnull": true,
   "quotmark": false,
-  "lastsemic": true
+  "lastsemic": true,
+  "esnext": true
 }

Gemfile

@@ -139,6 +139,7 @@ gem 'rest-client'
 gem 'rinku'
 gem 'sanitize'
 gem 'sass'
+gem 'es6_module_transpiler-rails'
 gem 'sidekiq'
 
 gem 'sinatra', require: nil

Gemfile.lock

@@ -84,6 +84,8 @@ GEM
     ember-source (1.6.0.beta.2)
       handlebars-source (~> 1.0)
     erubis (2.7.0)
+    es6_module_transpiler-rails (0.4.0)
+      execjs
     eventmachine (1.0.3)
     excon (0.28.0)
     execjs (2.0.2)
@@ -404,6 +406,7 @@ DEPENDENCIES
   email_reply_parser-discourse
   ember-rails
   ember-source (= 1.6.0.beta.2)
+  es6_module_transpiler-rails
   eventmachine
   fabrication
   fakeweb (~> 1.3.0)

app/assets/javascripts/discourse/controllers/history.js.es6

@@ -7,7 +7,7 @@
   @uses Discourse.ModalFunctionality
   @module Discourse
 **/
-Discourse.HistoryController = Discourse.ObjectController.extend(Discourse.ModalFunctionality, {
+export default Discourse.ObjectController.extend(Discourse.ModalFunctionality, {
   loading: false,
   viewMode: "side_by_side",
   revisionsTextKey: "post.revisions.controls.comparing_previous_to_current_out_of_total",

app/assets/javascripts/discourse/ember/resolver.js

@@ -1,3 +1,4 @@
+/* global requirejs, require */
 /**
   A custom resolver to allow template names in the format we like.
 
@@ -8,6 +9,17 @@
 **/
 Discourse.Resolver = Ember.DefaultResolver.extend({
 
+  resolveController: function(parsedName) {
+    var moduleName = "discourse/controllers/" + parsedName.fullNameWithoutType,
+        module = requirejs.entries[moduleName];
+
+    if (module) {
+      module = require(moduleName, null, null, true /* force sync */);
+      if (module && module['default']) { module = module['default']; }
+    }
+    return module || this._super(parsedName);
+  },
+
   /**
     Attaches a view and wires up the container properly
 

app/assets/javascripts/vendor.js

@@ -5,9 +5,9 @@
 //= require jquery_include.js
 //= require ember_include.js
 
+//= require loader
 //= require message-bus
 //= require jquery.ui.widget.js
-//= require_tree ./discourse/ember
 //= require LAB.js
 //= require Markdown.Converter.js
 //= require better_markdown.js
@@ -38,3 +38,4 @@
 //= require lock-on.js
 //= require ember-cloaking
 //= require break_string
+//= require_tree ./discourse/ember

lib/discourse_iife.rb

@@ -12,6 +12,9 @@ class DiscourseIIFE < Sprockets::Processor
     return data if (path =~ /test\_helper\.js/)
     return data if (path =~ /javascripts\/helpers\//)
 
+    # Ignore ES6 files
+    return data if (path =~ /\.es6/)
+
     # Ignore translations
     return data if (path =~ /\/translations/)
 
@@ -23,4 +26,4 @@ class DiscourseIIFE < Sprockets::Processor
     "(function () {\n\nvar $ = window.jQuery;\n// IIFE Wrapped Content Begins:\n\n#{data}\n\n// IIFE Wrapped Content Ends\n\n })(this);"
   end
 
-end
+end

vendor/assets/javascripts/loader.js

@@ -0,0 +1,94 @@
+var define, requireModule, require, requirejs;
+
+(function() {
+  var registry = {}, seen = {}, state = {};
+  var FAILED = false;
+
+  define = function(name, deps, callback) {
+    registry[name] = {
+      deps: deps,
+      callback: callback
+    };
+  };
+
+  function reify(deps, name, seen) {
+    var length = deps.length;
+    var reified = new Array(length);
+    var dep;
+    var exports;
+
+    for (var i = 0, l = length; i < l; i++) {
+      dep = deps[i];
+      if (dep === 'exports') {
+        exports = reified[i] = seen;
+      } else {
+        reified[i] = require(resolve(dep, name));
+      }
+    }
+
+    return {
+      deps: reified,
+      exports: exports
+    };
+  }
+
+  requirejs = require = requireModule = function(name) {
+    if (state[name] !== FAILED &&
+        seen.hasOwnProperty(name)) {
+      return seen[name];
+    }
+
+    if (!registry[name]) {
+      throw new Error('Could not find module ' + name);
+    }
+
+    var mod = registry[name];
+    var reified;
+    var module;
+    var loaded = false;
+
+    seen[name] = { }; // placeholder for run-time cycles
+
+    try {
+      reified = reify(mod.deps, name, seen[name]);
+      module = mod.callback.apply(this, reified.deps);
+      loaded = true;
+    } finally {
+      if (!loaded) {
+        state[name] = FAILED;
+      }
+    }
+
+    return reified.exports ? seen[name] : (seen[name] = module);
+  };
+
+  function resolve(child, name) {
+    if (child.charAt(0) !== '.') { return child; }
+
+    var parts = child.split('/');
+    var nameParts = name.split('/');
+    var parentBase;
+
+    if (nameParts.length === 1) {
+      parentBase = nameParts;
+    } else {
+      parentBase = nameParts.slice(0, -1);
+    }
+
+    for (var i = 0, l = parts.length; i < l; i++) {
+      var part = parts[i];
+
+      if (part === '..') { parentBase.pop(); }
+      else if (part === '.') { continue; }
+      else { parentBase.push(part); }
+    }
+
+    return parentBase.join('/');
+  }
+
+  requirejs.entries = requirejs._eak_seen = registry;
+  requirejs.clear = function(){
+    requirejs.entries = requirejs._eak_seen = registry = {};
+    seen = state = {};
+  };
+})();