Refine constants exports

Author: ethan605

index.js

@@ -3,4 +3,8 @@
  */
 
 import RefreshableList from './src/RefreshableList';
+import constants from './src/constants';
+import * as utils from './src/utils';
+
+export { constants, utils };
 export default RefreshableList;

src/constants.js

@@ -19,7 +19,7 @@ const MULTIPLE_SECTIONS_DATASOURCE = new ListView.DataSource({
   sectionHeaderHasChanged: ((s1, s2) => s1 !== s2),
 });
 
-export default {
+export {
   DEFAULT_SECTION_ID,
   EMPTY_DATA,
   PLACEHOLDER_DATA,