module.exports should default to an empty object.

sky/examples/city-list/city-list.sky

 <!--
 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 -->
 <import src="../../framework/sky-element/sky-element.sky" as="SkyElement" />
 <import src="city-data-service.sky" as="CityDataService" />
 <import src="city-sequence.sky" as="CitySequence" />
 
-<script>
-// TODO(esprehn): exports should start as the empty object.
-module.exports = {};
-</script>
-
 <sky-element name="state-header">
 <template>
   <style>
     div {
       font-size: 16px;
       color: #FFF;
       background-color: #333;
       padding: 4px 4px 4px 12px;
       display: paragraph;
     }
@@ skipping 594 matching lines @@
 
       scrollBy(amount) {
         this.scrollerElement.scrollTop += amount;
         this.handleScroll({ target: this.scrollerElement });
       }
     }.register();
 
 })(this);
 </script>
 </sky-element>