Use const and let instead of var

lib/cartodb/models/mapconfig/provider/named-map-provider.js

@@ -1,8 +1,8 @@
-var crypto = require('crypto');
-var dot = require('dot');
-var MapConfig = require('windshaft').model.MapConfig;
-var templateName = require('../../../backends/template_maps').templateName;
-var QueryTables = require('cartodb-query-tables');
+const crypto = require('crypto');
+const dot = require('dot');
+const MapConfig = require('windshaft').model.MapConfig;
+const templateName = require('../../../backends/template_maps').templateName;
+const QueryTables = require('cartodb-query-tables');
 
 /**
  * @constructor
@@ -61,7 +61,7 @@ NamedMapMapConfigProvider.prototype.getMapConfig = function (callback) {
             return callback(err);
         }
 
-        var templateParams = {};
+        let templateParams = {};
 
         if (this.config) {
             try {
@@ -123,7 +123,7 @@ NamedMapMapConfigProvider.prototype.getContext = function (callback) {
                 return callback(err);
             }
 
-            var context = {};
+            const context = {};
 
             context.analysisConfiguration = {
                 user: this.owner,
@@ -168,36 +168,33 @@ NamedMapMapConfigProvider.prototype.getTemplate = function(callback) {
         }
 
         if (!tpl) {
-            var notFoundErr = new Error(
-                    "Template '" + this.templateName + "' of user '" + this.owner + "' not found"
-            );
-            notFoundErr.http_status = 404;
+            const error = new Error(`Template '${this.templateName}' of user '${this.owner}' not found`);
+            error.http_status = 404;
 
-            this.err = notFoundErr;
+            this.err = error;
 
-            return callback(notFoundErr);
+            return callback(error);
         }
 
-        var authorized = false;
+        let authorized = false;
 
         try {
             authorized = this.templateMaps.isAuthorized(tpl, this.authToken);
         } catch (err) {
-            // we catch to add http_status
-            var authorizationFailedErr = new Error('Failed to authorize template');
-            authorizationFailedErr.http_status = 403;
+            const error = new Error('Failed to authorize template');
+            error.http_status = 403;
 
-            this.err = authorizationFailedErr;
+            this.err = error;
 
-            return callback(authorizationFailedErr);
+            return callback(error);
         }
 
         if (!authorized) {
-            var unauthorizedErr = new Error('Unauthorized template instantiation');
-            unauthorizedErr.http_status = 403;
-            this.err = unauthorizedErr;
+            const error = new Error('Unauthorized template instantiation');
+            error.http_status = 403;
+            this.err = error;
 
-            return callback(unauthorizedErr);
+            return callback(error);
         }
 
         this.template = tpl;
@@ -226,19 +223,19 @@ NamedMapMapConfigProvider.prototype.reset = function() {
 };
 
 NamedMapMapConfigProvider.prototype.filter = function(key) {
-    var regex = new RegExp('^' + this.createKey(true) + '.*');
+    const regex = new RegExp('^' + this.createKey(true) + '.*');
     return key && key.match(regex);
 };
 
 // Configure bases for cache keys suitable for string interpolation
-var baseKey = '{{=it.dbname}}:{{=it.owner}}:{{=it.templateName}}';
-var rendererKey = baseKey + ':{{=it.authToken}}:{{=it.configHash}}:{{=it.format}}:{{=it.layer}}:{{=it.scale_factor}}';
+const baseKey = '{{=it.dbname}}:{{=it.owner}}:{{=it.templateName}}';
+const rendererKey = baseKey + ':{{=it.authToken}}:{{=it.configHash}}:{{=it.format}}:{{=it.layer}}:{{=it.scale_factor}}';
 
-var baseKeyTpl = dot.template(baseKey);
-var rendererKeyTpl = dot.template(rendererKey);
+const baseKeyTpl = dot.template(baseKey);
+const rendererKeyTpl = dot.template(rendererKey);
 
 NamedMapMapConfigProvider.prototype.createKey = function(base) {
-    var tplValues = Object.assign({
+    const tplValues = Object.assign({
         dbname: '',
         owner: this.owner,
         templateName: this.templateName,