Proof of concept: Load controller via ES6 module in Discourse

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 = {};
+  };
+})();