drop any leftover empty blocks, e.g. :root { }

Author: leeoniya

dist/dropcss.cjs.js

@@ -939,7 +939,8 @@ function postProc$1(out, shouldDrop, log, START) {
 
 	out = dropCssVars(out, shouldDrop);
 
-	return out;
+	// kill any leftover empty blocks e.g. :root {}
+	return out.replace(/[^{}]+\{\s*\}/gm, '');
 }
 
 var ATTRIBUTES = /\[([\w-]+)(?:(.?=)"?([^\]]*?)"?)?\]/i;

dist/dropcss.js

@@ -943,7 +943,8 @@
 
 		out = dropCssVars(out, shouldDrop);
 
-		return out;
+		// kill any leftover empty blocks e.g. :root {}
+		return out.replace(/[^{}]+\{\s*\}/gm, '');
 	}
 
 	var ATTRIBUTES = /\[([\w-]+)(?:(.?=)"?([^\]]*?)"?)?\]/i;

dist/dropcss.min.js

@@ -27,7 +27,7 @@
   "devDependencies": {
     "mocha": "^6.1.4",
     "nyc": "^14.1.1",
-    "rollup": "^1.12.5",
+    "rollup": "^1.13.0",
     "rollup-plugin-buble": "^0.19.6",
     "rollup-plugin-cjs-es": "^0.7.0",
     "rollup-plugin-terser": "^5.0.0"

package.json

@@ -151,7 +151,8 @@ function postProc(out, shouldDrop, log, START) {
 
 	LOGGING && log.push([+new Date() - START, 'Drop unused --* props']);
 
-	return out;
+	// kill any leftover empty blocks e.g. :root {}
+	return out.replace(/[^{}]+\{\s*\}/gm, '');
 }
 
 exports.postProc = postProc;

src/postproc.js

@@ -1,5 +1,3 @@
-:root{
-}
 *,::after,::before{
     box-sizing:border-box
 }