require node 12, fix root selectors

Author: silverwind

.github/workflows/ci.yaml

@@ -7,7 +7,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest]
-        node: ['10', '12', '14']
+        node: ['12', '14', '16']
 
     runs-on: ${{ matrix.os }}
     steps:

index.js

@@ -72,6 +72,10 @@ const selectorsIntersect = memo((a, b) => {
   }
 });
 
+function isRootSelector(selector) {
+  return selector.startsWith("html") || selector.startsWith(":root");
+}
+
 function rewriteSelectors(selectors, opts, src) {
   const ret = [];
 
@@ -108,7 +112,9 @@ function rewriteSelectors(selectors, opts, src) {
       }
 
       if (!skip) {
-        if (intersects) {
+        if (isRootSelector(first) && isRootSelector(src.prefix)) {
+          selector = `${src.prefix} ${selector.substring(first.length).trim()}`;
+        } else if (intersects) {
           selector = `${first}${selector}`;
         } else {
           selector = `${src.prefix} ${selector}`;

package.json

@@ -6,7 +6,7 @@
   "repository": "silverwind/remap-css",
   "license": "BSD-2-Clause",
   "engines": {
-    "node": ">=10"
+    "node": ">=12"
   },
   "keywords": [
     "remap",