photoshop js script remove meta data

function removeMetadata( file ){
  if ( !ExternalObject.AdobeXMPScript ) ExternalObject.AdobeXMPScript = new ExternalObject('lib:AdobeXMPScript');
  var xmpf = new XMPFile( File(file).fsName, XMPConst.UNKNOWN, XMPConst.OPEN_FOR_UPDATE );
  var xmp = xmpf.getXMP();
  XMPUtils.removeProperties(xmp, "", "", XMPConst.REMOVE_ALL_PROPERTIES);
  if (xmpf.canPutXMP( xmp )) {
    xmpf.putXMP( xmp );
  }
  xmpf.closeFile( XMPConst.CLOSE_UPDATE_SAFELY );
};
var f = File("/example.tif");
removeMetadata(f);