diff --git a/cache.inc.php b/cache.inc.php
index 95bd30c..b95ced1 100644
--- a/cache.inc.php
+++ b/cache.inc.php
@@ -268,8 +268,11 @@ class ConfigCacheFileMap
     return array_keys($this->file2deps[$file]);
   }
 
-  function differs(array $files) : bool
+  function differs(ConfigDirFiles|\taskman\artefact\TaskmanDirFiles|array $files) : bool
   {
+    if(!is_array($files))
+      $files = $files->getAllFiles();
+
     $this_files = array_keys($this->file2deps);
 
     return count($files) !== count($this_files) || 
diff --git a/config.inc.php b/config.inc.php
index 78787fc..d030495 100644
--- a/config.inc.php
+++ b/config.inc.php
@@ -56,6 +56,7 @@ class ConfigUpdateRequest
   public ConfigUpdateMode $mode;
   public ?ConfigDirFiles $files;
   public ?string $result_file;
+  public ?\taskman\TaskmanFileChanges $file_changes;
 
   private function __construct() {}
 
@@ -76,7 +77,16 @@ class ConfigUpdateRequest
     return $req;
   }
 
-  static function patch(ConfigDirFiles $files) : ConfigUpdateRequest
+  static function patch(\taskman\TaskmanFileChanges $file_changes, ConfigDirFiles $files) : ConfigUpdateRequest
+  {
+    $req = new ConfigUpdateRequest();
+    $req->mode = ConfigUpdateMode::Patch;
+    $req->files = $files;
+    $req->file_changes = $file_changes;
+    return $req;
+  }
+
+  static function selected(ConfigDirFiles $files) : ConfigUpdateRequest
   {
     $req = new ConfigUpdateRequest();
     $req->mode = ConfigUpdateMode::Patch;
@@ -109,7 +119,7 @@ class ConfigManager
     return $this->cache;
   }
 
-  function getArtifactFilesSpec() : array
+  function getArtefactFilesSpec() : array
   {
     return [$this->globals->base_dirs, ['.js']];
   }
@@ -215,14 +225,15 @@ class ConfigManager
     }
     else if($req->mode === ConfigUpdateMode::Patch)
     {
-      foreach($req->files as $file)
+      if($req->file_changes != null)
       {
-        //TODO: is it robust enough?
-        //TODO: we should make difference between changed and added!
-        if(file_exists($file))
-          $added_files[] = $file;
-        else
-          $removed_files[] = $file;
+        foreach($req->files as $file)
+        {
+          if($req->file_changes->isCreated($file))
+            $added_files[] = $file;
+          else if($req->file_changes->isDeleted($file))
+            $removed_files[] = $file;
+        }
       }
     }
   }
@@ -295,17 +306,6 @@ class ConfigManager
     {
       $affected_files = ConfigDirFiles::makeFor($this);
 
-      foreach($req->files as $file)
-      {
-        //removed config special case
-        if(str_ends_with($file, '.conf.js') && in_array($file, $removed_files))
-        {
-          //NOTE: let it be for now, rebuilds the whole bundle
-          $affected_files = $this->scanFiles(extension: '.conf.js');
-          return $affected_files;
-        }
-      }
-
       foreach($req->files as $file)
       {
         $affected_files->addFile($file, unique: true);