Replace dependency

Author: wooorm

lib/contents.js

@@ -21,7 +21,7 @@
  *   `hast-util-sanitize`.
  */
 
-import extend from 'extend'
+import structuredClone from '@ungap/structured-clone'
 
 /**
  * Transform a list of heading objects to a markdown list.
@@ -168,9 +168,11 @@ function one(node) {
 
   if ('children' in node) {
     const {children, position, ...copy} = node
-    return Object.assign(extend(true, {}, copy), {children: all(node.children)})
+    return Object.assign(structuredClone(copy), {
+      children: all(node.children)
+    })
   }
 
   const {position, ...copy} = node
-  return extend(true, {}, copy)
+  return structuredClone(copy)
 }

package.json

@@ -35,9 +35,9 @@
     "index.js"
   ],
   "dependencies": {
-    "@types/extend": "^3.0.0",
     "@types/mdast": "^4.0.0",
-    "extend": "^3.0.0",
+    "@ungap/structured-clone": "^1.0.0",
+    "@types/ungap__structured-clone": "^0.3.0",
     "github-slugger": "^2.0.0",
     "mdast-util-to-string": "^4.0.0",
     "unist-util-is": "^6.0.0",