The F# repl (FSI as fsharp interactive) works in .net core 3.0 preview already, you can do `dotnet fsi` to run it
Type providers works in general, but depends if the type provider library was updated to use latest type provider sdk.
Also generative type provider may not works, erasing works
Type providers works in general, but depends if the type provider library was updated to use latest type provider sdk. Also generative type provider may not works, erasing works