diff --git a/index.d.ts b/index.d.ts
index 24b3a1b..09ede82 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -248,6 +248,14 @@ declare global {
          * @param path
          */
         remove(path: string): void
+
+        /**
+         * copy file or directory
+         *
+         * @param src
+         * @param dest
+         */
+        copy(src: string, dest: string): void
     }
 
     interface TplPackage {