chore: extract env to var (#681)

Author: evenstensberg

vue.config.js

@@ -12,10 +12,12 @@ const path = require('path');
 const vueUtils = require('./src/setup-utils/vue-config-utils');
 const BASE_URL_PLACEHOLDER = require('./bin/baseUrlPlaceholder');
 
+const isDev = process.env.NODE_ENV === 'development';
+
 module.exports = vueUtils({
   // we are setting a hard public path to the placeholder template.
   // after the build is done, we will replace this with the BASE_URL env the user specified.
-  publicPath: process.env.NODE_ENV === 'development' ? undefined : BASE_URL_PLACEHOLDER,
+  publicPath: isDev ? undefined : BASE_URL_PLACEHOLDER,
   pages: {
     index: {
       entry: 'app/main.js',