Use const instead for let

Author: tshemsedinov

JavaScript/framework.js

@@ -11,17 +11,17 @@ api.vm = require('vm');
 
 // Create a hash and turn it into the sandboxed context which will be
 // the global context of an application
-let context = { module: {}, console: console };
+const context = { module: {}, console };
 context.global = context;
-let sandbox = api.vm.createContext(context);
+const sandbox = api.vm.createContext(context);
 
 // Read an application source code from the file
-let fileName = './application.js';
+const fileName = './application.js';
 api.fs.readFile(fileName, (err, src) => {
   // We need to handle errors here
 
   // Run an application in sandboxed context
-  let script = api.vm.createScript(src, fileName);
+  const script = api.vm.createScript(src, fileName);
   script.runInNewContext(sandbox);
 
   // We can access a link to exported interface from sandbox.module.exports