app "tui"
    packages { pf: "tui-platform" }
    imports [ pf.Program.{ Program } ]
    provides [ main ] { Model } to pf

Model : Str

main : Program Model
main =
    {
        init: \{  } -> "Hello World",
        update: \model, new -> Str.concat model new,
        view: \model -> Str.concat model "!",
    }