const config = require('./config');

if (config.isProduction || require('piping')(config.piping)) {
  if (!process.env.NODE_ENV)
    throw new Error('Environment variable NODE_ENV isn\'t set. Remember it\'s up your production enviroment to set NODE_ENV and maybe other variables. To run app locally in production mode, use gulp -p command instead.');

  // Load and use polyfill for ECMA-402.
  if (!global.Intl)
    global.Intl = require('intl');

  require('babel/register')({optional: ['es7']});

  // To ignore webpack custom loaders on server.
  config.webpackStylesExtensions.forEach(function(ext) {
    require.extensions['.' + ext] = function() {};
  });

  require('./main');
}

const config = require('./config');

if (config.isProduction || require('piping')(config.piping)) {
  if (!process.env.NODE_ENV)
    throw new Error('Environment variable NODE_ENV must be set.');

  // Load and use polyfill for ECMA-402.
  if (!global.Intl)
    global.Intl = require('intl');

  require('babel/register')({optional: ['es7']});

  // To ignore webpack custom loaders on server.
  config.webpackStylesExtensions.forEach(function(ext) {
    require.extensions['.' + ext] = function() {};
  });

  require('./main');
}

--- 
+++ 
@@ -2,7 +2,7 @@
 
 if (config.isProduction || require('piping')(config.piping)) {
   if (!process.env.NODE_ENV)
-    throw new Error('Environment variable NODE_ENV must be set.');
+    throw new Error('Environment variable NODE_ENV isn\'t set. Remember it\'s up your production enviroment to set NODE_ENV and maybe other variables. To run app locally in production mode, use gulp -p command instead.');
 
   // Load and use polyfill for ECMA-402.
   if (!global.Intl)
Improve error message for npm start without NODE_ENV.
