AppCode i can understand, but the Swift plugin for CLion too? That's surprising, considering Apple is now maintaining a full featured LSP server implementation, so now VSCode users can do Swift dev

They have Fleet wich should support LSP, but i'm not sure if that product will be successful, they have a lot of work to do with regard to performance (cpu/memory), and based on the recent public preview, it's built with the wrong foundation for that matter