Omg yes finally someone acknowledges this. I am always pointing out how react and jsx are a port of XHP. This is why react was class based at first (because php is a class based OO language).
Hack was created later though. XHP was a php 5 extension created around 2008
React was originally desingned to be php in the browser.
php5 -> HHVM -> Hack -> XHP -> JSX