Hot fix for broken isClean on AST dublication

lib/container.js

@@ -1,7 +1,7 @@
 'use strict'
 
+let { isClean, my } = require('./symbols')
 let Declaration = require('./declaration')
-let { isClean } = require('./symbols')
 let Comment = require('./comment')
 let Node = require('./node')
 
@@ -24,25 +24,6 @@ function markDirtyUp(node) {
   }
 }
 
-// istanbul ignore next
-function rebuild(node) {
-  if (node.type === 'atrule') {
-    Object.setPrototypeOf(node, AtRule.prototype)
-  } else if (node.type === 'rule') {
-    Object.setPrototypeOf(node, Rule.prototype)
-  } else if (node.type === 'decl') {
-    Object.setPrototypeOf(node, Declaration.prototype)
-  } else if (node.type === 'comment') {
-    Object.setPrototypeOf(node, Comment.prototype)
-  }
-
-  if (node.nodes) {
-    node.nodes.forEach(child => {
-      rebuild(child)
-    })
-  }
-}
-
 class Container extends Node {
   push(child) {
     child.parent = this
@@ -336,7 +317,7 @@ class Container extends Node {
 
     let processed = nodes.map(i => {
       // istanbul ignore next
-      if (typeof i.markDirty !== 'function') rebuild(i)
+      if (!i[my]) Container.rebuild(i)
       i = i.proxyOf
       if (i.parent) i.parent.removeChild(i)
       if (i[isClean]) markDirtyUp(i)
@@ -428,3 +409,22 @@ Container.registerAtRule = dependant => {
 
 module.exports = Container
 Container.default = Container
+
+// istanbul ignore next
+Container.rebuild = node => {
+  if (node.type === 'atrule') {
+    Object.setPrototypeOf(node, AtRule.prototype)
+  } else if (node.type === 'rule') {
+    Object.setPrototypeOf(node, Rule.prototype)
+  } else if (node.type === 'decl') {
+    Object.setPrototypeOf(node, Declaration.prototype)
+  } else if (node.type === 'comment') {
+    Object.setPrototypeOf(node, Comment.prototype)
+  }
+
+  if (node.nodes) {
+    node.nodes.forEach(child => {
+      Container.rebuild(child)
+    })
+  }
+}

lib/lazy-result.js

@@ -1,13 +1,14 @@
 'use strict'
 
+let { isClean, my } = require('./symbols')
 let MapGenerator = require('./map-generator')
-let { isClean } = require('./symbols')
 let stringify = require('./stringify')
+let Container = require('./container')
+let Document = require('./document')
 let warnOnce = require('./warn-once')
 let Result = require('./result')
 let parse = require('./parse')
 let Root = require('./root')
-let Document = require('./document')
 
 const TYPE_TO_CLASS_NAME = {
   document: 'Document',
@@ -134,6 +135,8 @@ class LazyResult {
         this.processed = true
         this.error = error
       }
+
+      if (root && !root[my]) Container.rebuild(root)
     }
 
     this.result = new Result(processor, root, opts)

lib/symbols.js

@@ -1,3 +1,5 @@
 'use strict'
 
 module.exports.isClean = Symbol('isClean')
+
+module.exports.my = Symbol('my')