diff --git a/TODO.md b/TODO.md
index 7396d66..f6e90ee 100644
--- a/TODO.md
+++ b/TODO.md
@@ -1,7 +1,7 @@
 # lang1
 
-[lang1] 支持 `(assert-equal)` 与 `(assert-not-equal)`
 [lang1] fix `freshen` -- be like lang0 with `usedNames`
+[lang1] 支持 `(assert-equal)` 与 `(assert-not-equal)`
 [lang1] 支持直接递归函数与相互递归函数，不能判断等价的地方就不判断。
 
 # lang0
diff --git a/package-lock.json b/package-lock.json
index 77ec2ae..538c807 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -19,7 +19,7 @@
         "clique": "bin/clique.js"
       },
       "devDependencies": {
-        "@types/node": "^20.12.11",
+        "@types/node": "^20.12.12",
         "@xieyuheng/test-runner": "^0.2.10",
         "prettier": "^3.2.5",
         "prettier-plugin-organize-imports": "^3.2.4",
@@ -107,9 +107,9 @@
       }
     },
     "node_modules/@types/node": {
-      "version": "20.12.11",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.12.11.tgz",
-      "integrity": "sha512-vDg9PZ/zi+Nqp6boSOT7plNuthRugEKixDv5sFTIpkE89MmNtEArAShI4mxuX2+UrLEe9pxC1vm2cjm9YlWbJw==",
+      "version": "20.12.12",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-20.12.12.tgz",
+      "integrity": "sha512-eWLDGF/FOSPtAvEqeRAQ4C8LSA7M1I7i0ky1I8U7kD1J5ITyW3AsRhQrKVoWf5pFKZ2kILsEGJhsI9r93PYnOw==",
       "dependencies": {
         "undici-types": "~5.26.4"
       }
diff --git a/package.json b/package.json
index 2d9f2d1..4e2d83f 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "regexp-match-indices": "^1.0.2"
   },
   "devDependencies": {
-    "@types/node": "^20.12.11",
+    "@types/node": "^20.12.12",
     "@xieyuheng/test-runner": "^0.2.10",
     "prettier": "^3.2.5",
     "prettier-plugin-organize-imports": "^3.2.4",
diff --git a/src/lang0/utils/freshen.ts b/src/lang0/utils/freshen.ts
index 9c5bf5e..578d803 100644
--- a/src/lang0/utils/freshen.ts
+++ b/src/lang0/utils/freshen.ts
@@ -16,18 +16,3 @@ export function freshen(
     }
   }
 }
-
-export function freshenNames(
-  usedNames: Array<string> | Set<string>,
-  names: Array<string> | Set<string>,
-): Map<string, string> {
-  usedNames = new Set([...usedNames, ...names])
-  const freshNameMap = new Map()
-  for (const name of names) {
-    const freshName = freshen(usedNames, name)
-    freshNameMap.set(name, freshName)
-    usedNames.add(freshName)
-  }
-
-  return freshNameMap
-}