Encore: configure runtime environment if not already configured

Author: Kocal

symfony/webpack-encore-bundle/1.0/webpack.config.js

@@ -1,5 +1,9 @@
 var Encore = require('@symfony/webpack-encore');
 
+if (!Encore.isRuntimeEnvironmentConfigured()) {
+    Encore.configureRuntimeEnvironment(process.env.NODE_ENV || 'dev');
+}
+
 Encore
     // directory where compiled assets will be stored
     .setOutputPath('public/build/')