html minify on production

src/transforms/html-min.js

@@ -0,0 +1,13 @@
+const htmlmin = require('html-minifier');
+
+module.exports = (value, outputPath) => {
+  if (outputPath && outputPath.indexOf('.html') > -1) {
+    return htmlmin.minify(value, {
+      useShortDoctype: true,
+      removeComments: true,
+      collapseWhitespace: true,
+      minifyCSS: true
+    });
+  }
+  return value;
+}