Changelog for mozjs52-52.4.0-1.fc27.x86_64.rpm :

* Thu Sep 28 2017 Kalev Lember - 52.4.0-1- Update to 52.4.0
* Wed Sep 20 2017 Kalev Lember - 52.3.0-1- Initial Fedora packaging, based on earlier mozjs45 work