src/Tools/VSCode/extension/src/decorations.ts

       const document = document_decorations.get(uri.toString()) || new Map<string, Content>()
       document.set(decoration.type, content)
       document_decorations.set(uri.toString(), document)
 
       for (const editor of window.visibleTextEditors) {
-        if (uri.toString === editor.document.uri.toString) {
+        if (uri.toString() === editor.document.uri.toString()) {
           editor.setDecorations(typ, content)
         }
       }
     }
   }