If you don't specify a constructor, one will be provided for you by the state.

lib/nodes.js

@@ -688,7 +688,7 @@
     __extends(ClassNode, BaseNode);
     ClassNode.prototype.type = 'Class';
     ClassNode.prototype.compile_node = function compile_node(o) {
-      var _a, _b, _c, construct, extension, func, prop, props, ret, returns, val;
+      var _a, _b, _c, applied, construct, extension, func, prop, props, ret, returns, val;
       extension = this.parent && new ExtendsNode(this.variable, this.parent);
       constructor = null;
       props = new Expressions();
@@ -709,8 +709,13 @@
           props.push(prop);
         }
       }
-      if (!(constructor)) {
-        constructor = new AssignNode(this.variable, new CodeNode());
+      if (!constructor) {
+        if (this.parent) {
+          applied = new ValueNode(this.parent, [new AccessorNode(new LiteralNode('apply'))]);
+          constructor = new AssignNode(this.variable, new CodeNode([], new Expressions([new CallNode(applied, [new LiteralNode('this'), new LiteralNode('arguments')])])));
+        } else {
+          constructor = new AssignNode(this.variable, new CodeNode());
+        }
       }
       construct = this.idt() + constructor.compile(o) + ';\n';
       props = props.empty() ? '' : props.compile(o) + '\n';

src/nodes.coffee

@@ -523,7 +523,14 @@ exports.ClassNode: class ClassNode extends BaseNode
           prop: new AssignNode(val, prop.value)
         props.push prop
 
-    constructor: new AssignNode(@variable, new CodeNode()) unless constructor
+    if not constructor
+      if @parent
+        applied: new ValueNode(@parent, [new AccessorNode(new LiteralNode('apply'))])
+        constructor: new AssignNode(@variable, new CodeNode([], new Expressions([
+          new CallNode(applied, [new LiteralNode('this'), new LiteralNode('arguments')])
+        ])))
+      else
+        constructor: new AssignNode(@variable, new CodeNode())
 
     construct:                       @idt() + constructor.compile(o) + ';\n'
     props:     if props.empty() then '' else props.compile(o) + '\n'

test/test_classes.coffee

@@ -35,4 +35,12 @@ class SubClass extends SuperClass
   constructor: ->
     super 'sub'
 
-ok (new SubClass()).prop is 'top-super-sub'
+ok (new SubClass()).prop is 'top-super-sub'
+
+
+class OneClass
+  constructor: (name) -> @name: name
+
+class TwoClass extends OneClass
+
+ok (new TwoClass('three')).name is 'three'