diff --git a/.gitignore b/.gitignore
index 36e9cc0..470c161 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,9 +13,13 @@
 ?*.gitignore.*
 ?*.gitignore.*/
 *.gitomit
-*.gitomit/
 *.gitomit.*
+*.gitomit/
 *.gitomit.*/
+*.nogit
+*.nogit.*
+*.nogit/
+*.nogit.*/
 # 保留
 !.gitignore
 !.gitignore.*
diff --git a/coretool.js b/coretool.js
index a8f8227..c36e0ac 100644
--- a/coretool.js
+++ b/coretool.js
@@ -409,6 +409,17 @@ module.exports = {
     // if (/^\./.test(filename)) filename = `added$filename` // path.extname('.abc') 结果为 ''，所以要添加前缀
     // return path.extname(filename).toLowerCase() // openAi*Ext 是包含 . 的，所以用 path.extname
 
-  }
+  },
+
+  delete_undefined (obj, { depth } = {}) {
+    // delete all undefined properties recursively inside an obect
+    Object.keys(obj).forEach(key => {
+      if (typeof obj[key] === 'undefined') {
+        delete obj[key]
+      } else if (typeof obj[key] === 'object') {
+        this.delete_undefined(obj[key])
+      }
+    })
+  },
 
 }
diff --git a/seafile-ignore.txt b/seafile-ignore.txt
index 6795407..f761786 100644
--- a/seafile-ignore.txt
+++ b/seafile-ignore.txt
@@ -17,6 +17,10 @@
 *.sfomit.*
 *.sfomit/
 *.sfomit.*/
+*.nosf
+*.nosf.*
+*.nosf/
+*.nosf.*/
 
 .DS_Store
 */.DS_Store