Here's a pretty good explanation. https://stackoverflow.com/a/53234826 https://stackoverflow.com/a/53234826 There is a library that would allow you to declare

Here's a pretty good explanation. https://stackoverflow.com/a/53234826 https://stackoverflow.com/a/53234826 There is a library that would allow you to declare functional components, however it relies on code generation which might discourage others from using it. Dart is planning on adding static metaprogramming though, and that might provide a way to introduce functional components to Flutter without codegen.