added purgecss and cssnano

postcss.config.js

@@ -1,10 +1,25 @@
-const options = {
-  plugins: {
-    'postcss-import': {},
-    tailwindcss: {},
-    'postcss-cssnext': {},
-    'css-mqpacker': {}
+class TailwindExtractor {
+  static extract(content) {
+    return content.match(/[A-Za-z0-9-_:/]+/g) || [];
   }
+}
+
+const options = {
+  plugins: [
+    require('tailwindcss')('./tailwind.js'),
+    require('@fullhuman/postcss-purgecss')({
+      content: ['./app/*.js', './app/ui/*.js'],
+      extractors: [
+        {
+          extractor: TailwindExtractor,
+          extensions: ['js']
+        }
+      ]
+    }),
+    require('cssnano')({
+      preset: 'default'
+    })
+  ]
 };
 
 if (process.env.NODE_ENV === 'development') {