Uppercase for actual constants

lib/cartodb/controllers/layergroup.js

@@ -6,6 +6,14 @@ const DataviewBackend = require('../backends/dataview');
 const AnalysisStatusBackend = require('../backends/analysis-status');
 const MapStoreMapConfigProvider = require('../models/mapconfig/provider/map-store-provider');
 const QueryTables = require('cartodb-query-tables');
+const SUPPORTED_FORMATS = {
+    grid_json: true,
+    json_torque: true,
+    torque_json: true,
+    png: true,
+    png32: true,
+    mvt: true
+};
 
 /**
  * @param {prepareContext} prepareContext
@@ -374,20 +382,11 @@ function getStatusCode(tile, format){
     return tile.length === 0 && format === 'mvt'? 204 : 200;
 }
 
-const supportedFormats = {
-    grid_json: true,
-    json_torque: true,
-    torque_json: true,
-    png: true,
-    png32: true,
-    mvt: true
-};
-
 function parseFormat (format = '') {
     const prettyFormat = format.replace('.', '_');
     let formatStat = 'invalid';
 
-    if (supportedFormats[prettyFormat]) {
+    if (SUPPORTED_FORMATS[prettyFormat]) {
         formatStat = prettyFormat;
     }