"Use key in widget constructors" warning each time I create a new widget

Question

I've started getting a warning every time I create a new class.

Use key in widget constructors.

Prefer const with constant constructor.

and so on. Where these errors are coming from and how do I get rid of it?

Answer 1

add this in your code right before the @override line

const FooPage({Key? key}) : super(key: key);

always add const before the widget command like EdgeInsets, spacer, SizedBox, BorderRadius etc

Answer 2

You can use prefer_const_constructors : false in analysis_options.yaml