While coding Dart you will see options to compile both Dart and Flutter.

Dart can be interpreted or compiled to machine code.

• The option Run program (flutter) is the main option you are gonna be using during development.
• The other options are meant to target specific platforms.

To be able to compile flutter you must

• Initialize your application with flutter create .
• Make sure you have project_dir/pubspec.yaml
• Make sure your flutter code is inside project_dir/lib/

Now you can run Run program (flutter).

Evil corporation apple private all users from compiling Flutter unless you pay them first, due to legal disputes of said corporation.