React, Flux, GraphQL, Hack, HHVM...? All of this and more!
Late in 2017 it was announce d that Drupal would start using React.js for it's interface. Now this has progressed and therea resome examples available online from the team working on merging Drupal with React.js.
The initial work and planning was done at the DrupalCamp Florida in 2018. The plans to include React.js in Drupal have moved forward and there are now guidelines that will be followed by the team to make the initiative a reality.
The team will first focus on removing any blockers that prevent using Drupal REST APIs to provide complete control of all functionality in Drupal. Based on this the team will create an alternative Drupal administration interface as a single-page React application. This is similar to what the WordPress team did for their Calypso interface: What is WordPress Calypso?