Only have one method for generating a method.

dart/sdk/lib/_internal/compiler/implementation/js_emitter/class_builder.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart2js.js_emitter;
 
 /**
  * A data structure for collecting fragments of a class definition.
  */
 class ClassBuilder {
   final List<jsAst.Property> properties = <jsAst.Property>[];
 
   /// Set to true by user if class is indistinguishable from its superclass.
   bool isTrivial = false;
 
   // Has the same signature as [DefineStubFunction].
   void addProperty(String name, jsAst.Expression value) {
     properties.add(new jsAst.Property(js.string(name), value));
   }
 
   jsAst.Expression toObjectInitializer() {
     return new jsAst.ObjectInitializer(properties);
   }
+
+  void writeOn(CodeBuffer buffer, Compiler compiler, String separatedBy) {

[sra1, 2013/10/02 16:10:52]

I'm not sure I like writeOn - we have missing sourcemap data in many places and
this pattern makes it more difficult to add sourcemap data.

I'd rather generate an AST for the entire file and have some layout hints to
cause it to pretty-print as you desire.

[ahe, 2013/10/02 16:58:05]

Agreed. I should add a comment making it clear that this is temporary.

+    for (jsAst.Property property in properties) {
+      if (!buffer.isEmpty) buffer.write(separatedBy);
+      buffer.write(jsAst.prettyPrint(property, compiler));
+    }
+  }
 }