WordExpress is an open-source experiment by Ramsay Lanier that “aims to provide a better development experience” in WordPress using Javascript instead of PHP. It is a Node.js application using Express on the back end and React components on the template, and therefore not using HTML/PHP templates. In the middle, it uses a GraphQL server that queries your WordPress MYSQL database.
Keyword: experiment. But this is neat. He explains his motivations and more about the tooling used in the launch post.