var maxSize = shell.serviceManager.basics.bigInt; maxSize.value = 1024 * 1024 * 1024; // maxSize = 1 GB maxSize.multiply(10); // maxSize = 10 GB if (maxSize.compare(fileStream.size) > 0) { // File size is too big - do something here } maxSize.divide(10); // maxSize = 1 GB Assert(maxSize.value == (1024 * 1024 * 1024));