From: FRC Blog
For the 2019 season, C++ and Java development are moving from Eclipse (with deploy based on Ant scripts) to Microsoft’s VS Code (with deploy based on Gradle via GradleRIO). Given this significant change, we wanted to provide an opportunity for all teams to be able test the new IDE and tooling. The alpha is open to everyone to try, and will use existing 2018 core libraries (wpilib, ntcore, cscore, etc), meaning it is compatible with your robots, existing code and vendor libraries (like NavX, Phoenix, etc). More info about the alpha test, and instructions on how to get started with the new VS Code system can be found on ScreenSteps.