fix(core): update

ts/classes.smartfile.ts

@@ -306,4 +306,11 @@ export class SmartFile extends plugins.smartjson.Smartjson {
     stream.push(null); // Push null to signify the end of the stream (EOF)
     return stream;
   }
+
+  /**
+   * Returns the size of the file in bytes
+   */
+  public async getSize(): Promise<number> {
+    return this.contentBuffer.length;
+  }
 }