Let dev server middleware to decide when to initialize

packages/neutrino-middleware-dev-server/index.js

@@ -3,8 +3,7 @@ const hot = require('neutrino-middleware-hot');
 const opn = require('opn');
 
 module.exports = (neutrino, options = {}) => {
-  neutrino.use(hot);
-
+  if (process.env.NODE_ENV === 'development') {
     const config = neutrino.config;
     const server = ramda.pathOr({}, ['options', 'server'], neutrino);
     const protocol = process.env.HTTPS ? 'https' : 'http';
@@ -31,6 +30,7 @@ module.exports = (neutrino, options = {}) => {
       openInBrowser = Boolean(options.open);
     }
 
+    neutrino.use(hot);
     config
       .devServer
         .host(String(host))
@@ -67,4 +67,5 @@ module.exports = (neutrino, options = {}) => {
         opn(`${protocol}://${endHost}:${port}`);
       });
     }
+  }
 };

packages/neutrino-preset-web/index.js

@@ -42,6 +42,7 @@ module.exports = (neutrino) => {
   neutrino.use(imageLoader);
   neutrino.use(htmlTemplate, neutrino.options.html);
   neutrino.use(namedModules);
+  neutrino.use(devServer);
   neutrino.use(compileLoader, {
     include: [neutrino.options.source, neutrino.options.tests, require.resolve('./polyfills.js')],
     babel: {
@@ -112,7 +113,6 @@ module.exports = (neutrino) => {
         envs: ['browser', 'commonjs']
       }))
     .when(process.env.NODE_ENV === 'development', (config) => {
-      neutrino.use(devServer);
       config.devtool('source-map');
     }, (config) => {
       neutrino.use(clean, { paths: [neutrino.options.output] });