Replace dependency

lib/index.js

@@ -49,7 +49,7 @@
  *   replacement node that we’ll swap back in afterwards.
  */
 
-import extend from 'extend'
+import structuredClone from '@ungap/structured-clone'
 import {fromParse5} from 'hast-util-from-parse5'
 import {toParse5} from 'hast-util-to-parse5'
 import {htmlVoidElements} from 'html-void-elements'
@@ -422,8 +422,6 @@ function resetTokenizer(state, point) {
   setPoint(state, point)
 
   // Process final characters if they’re still there after hibernating.
-  // Similar to:
-  // See: <https://github.com/inikulin/parse5/blob/9c683e1/packages/parse5/lib/extensions/location-info/tokenizer-mixin.js#L95>.
   /** @type {CharacterToken} */
   // @ts-expect-error: private.
   // type-coverage:ignore-next-line
@@ -442,7 +440,7 @@ function resetTokenizer(state, point) {
   }
 
   // Reset tokenizer:
-  // See: <https://github.com/inikulin/parse5/blob/edb85df/packages/parse5/lib/tokenizer/index.ts#L225-L249>.
+  // See: <https://github.com/inikulin/parse5/blob/6f7ca60/packages/parse5/lib/tokenizer/index.ts#L187-L223>.
   // Especially putting it back in the `data` state is useful: some elements,
   // like textareas and iframes, change the state.
   // See GH-7.
@@ -707,6 +705,6 @@ function createParse5Location(node) {
  */
 function cloneWithoutChildren(node) {
   return 'children' in node
-    ? extend(true, {}, {...node, children: []})
-    : extend(true, {}, node)
+    ? structuredClone({...node, children: []})
+    : structuredClone(node)
 }

package.json

@@ -35,7 +35,7 @@
   ],
   "dependencies": {
     "@types/hast": "^3.0.0",
-    "extend": "^3.0.0",
+    "@ungap/structured-clone": "^1.0.0",
     "hast-util-from-parse5": "^8.0.0",
     "hast-util-to-parse5": "^8.0.0",
     "html-void-elements": "^3.0.0",
@@ -49,6 +49,7 @@
   },
   "devDependencies": {
     "@types/node": "^20.0.0",
+    "@types/ungap__structured-clone": "^0.3.0",
     "c8": "^8.0.0",
     "hast-util-to-html": "^8.0.0",
     "hastscript": "^8.0.0",