Fix: Do not override NODE_ENV if already set (styleguidist#474)

Author: aversini

bin/styleguidist.js

@@ -38,7 +38,7 @@ require('../scripts/utils/ensureWebpack');
 
 // Set environment before loading style guide config because user’s webpack config may use it
 const env = command === 'build' ? 'production' : 'development';
-process.env.NODE_ENV = env;
+process.env.NODE_ENV = process.env.NODE_ENV || env;
 
 // Load style guide config
 let config;

src/rsg-components/ReactComponent/ReactComponent.js

@@ -8,7 +8,7 @@ import Slot from 'rsg-components/Slot';
 import { DOCS_TAB_USAGE } from '../slots';
 import ReactComponentRenderer from 'rsg-components/ReactComponent/ReactComponentRenderer';
 
-const ExamplePlaceholder = process.env.NODE_ENV === 'development'
+const ExamplePlaceholder = process.env.NODE_ENV !== 'production'
 	? require('rsg-components/ExamplePlaceholder').default
 	: () => <div />;