Fix changing declaration meaning by comment removing

lib/parser.js

@@ -401,32 +401,20 @@ class Parser {
     let value = ''
     let clean = true
     let next, prev
-    let pattern = /^([#.|])?(\w)+/i
 
     for (let i = 0; i < length; i += 1) {
       token = tokens[i]
       type = token[0]
-
-      if (type === 'comment' && node.type === 'rule') {
+      if (type === 'space' && i === length - 1) {
+        clean = false
+      } else if (type === 'comment') {
         prev = tokens[i - 1]
         next = tokens[i + 1]
-
-        if (
-          prev[0] !== 'space' &&
-          next[0] !== 'space' &&
-          pattern.test(prev[1]) &&
-          pattern.test(next[1])
-        ) {
+        if (prev && next && prev[0] !== 'space' && next[0] !== 'space') {
           value += token[1]
         } else {
           clean = false
         }
-
-        continue
-      }
-
-      if (type === 'comment' || (type === 'space' && i === length - 1)) {
-        clean = false
       } else {
         value += token[1]
       }

package.json

@@ -93,7 +93,7 @@
     "fs-extra": "^10.0.0",
     "nanodelay": "^1.0.8",
     "nanospy": "^0.4.0",
-    "postcss-parser-tests": "^8.3.7",
+    "postcss-parser-tests": "postcss/postcss-parser-tests",
     "simple-git-hooks": "^2.7.0",
     "size-limit": "^7.0.5",
     "strip-ansi": "^6.0.1",