add from

source/funkin/play/notes/notekind/NoteKind.hx

@@ -73,7 +73,7 @@ class NoteKind implements INoteScriptedClass
  * Abstract for setting the type of the `NoteKindParam`
  * This was supposed to be an enum but polymod kept being annoying
  */
-abstract NoteKindParamType(String) to String
+abstract NoteKindParamType(String) from String to String
 {
   public static final STRING:String = 'String';
 

source/funkin/ui/debug/charting/toolboxes/ChartEditorNoteDataToolbox.hx

@@ -186,8 +186,7 @@ class ChartEditorNoteDataToolbox extends ChartEditorBaseToolbox
 
       var paramComponent:Component = null;
 
-      final paramType:String = param.type;
-      switch (paramType)
+      switch (param.type)
       {
         case NoteKindParamType.INT | NoteKindParamType.FLOAT:
           var paramStepper:NumberStepper = new NumberStepper();