Make changes needed to compile on CoffeeScript 2

lib/dumper.js

@@ -1,6 +1,5 @@
 (function() {
-  var emitter, representer, resolver, serializer, util,
-    slice = [].slice;
+  var emitter, representer, resolver, serializer, util;
 
   util = require('./util');
 
@@ -12,46 +11,34 @@
 
   resolver = require('./resolver');
 
-  this.make_dumper = function(Emitter, Serializer, Representer, Resolver) {
+  this.make_dumper = function(Emitter = emitter.Emitter, Serializer = serializer.Serializer, Representer = representer.Representer, Resolver = resolver.Resolver) {
     var Dumper, components;
-    if (Emitter == null) {
-      Emitter = emitter.Emitter;
-    }
-    if (Serializer == null) {
-      Serializer = serializer.Serializer;
-    }
-    if (Representer == null) {
-      Representer = representer.Representer;
-    }
-    if (Resolver == null) {
-      Resolver = resolver.Resolver;
-    }
     components = [Emitter, Serializer, Representer, Resolver];
     return Dumper = (function() {
       var component;
 
-      util.extend.apply(util, [Dumper.prototype].concat(slice.call((function() {
+      class Dumper {
+        constructor(stream, options = {}) {
+          var i, len, ref;
+          components[0].prototype.initialise.call(this, stream, options);
+          ref = components.slice(1);
+          for (i = 0, len = ref.length; i < len; i++) {
+            component = ref[i];
+            component.prototype.initialise.call(this, options);
+          }
+        }
+
+      };
+
+      util.extend(Dumper.prototype, ...(function() {
         var i, len, results;
         results = [];
         for (i = 0, len = components.length; i < len; i++) {
           component = components[i];
           results.push(component.prototype);
         }
         return results;
-      })())));
-
-      function Dumper(stream, options) {
-        var i, len, ref;
-        if (options == null) {
-          options = {};
-        }
-        components[0].call(this, stream, options);
-        ref = components.slice(1);
-        for (i = 0, len = ref.length; i < len; i++) {
-          component = ref[i];
-          component.call(this, options);
-        }
-      }
+      })());
 
       return Dumper;