where should the size values be place? - flutter

Question

I am making the length and width values with the help of Mediaquery to be a responsive design. Where should I put these values ? in core/constants/ ? is there any project I can take an example of to find out this kind of thing or document.
├───core
│ ├───constants
│ │ ├───app
│ │ ├───color
│ │ └───textstyle
│ ├───extension
│ └───init
│ └───translations
├───product
│ ├───error
│ ├───navigator
│ │ └───guard
│ └───widget
│ ├───appbar
│ ├───button
│ └───textfield
├───providers
└───view
├───authenticate
│ ├───login
│ │ ├───model
│ │ ├───service
│ │ ├───view
│ │ └───viewmodel
│ ├───onboard
│ │ ├───model
│ │ ├───view
│ │ └───widget
│ ├───register
│ │ ├───model
│ │ ├───service
│ │ └───view
│ └───reset_password_view.dart
│ └───view
├───home
│ ├───home
│ │ └───view
│ ├───menu
│ │ └───view
│ ├───models
│ ├───more
│ │ └───view
│ ├───offers
│ │ └───view
│ └───profile
│ └───view
├───welcome
│ └───view
└───_product
└───_widgets
├───card
├───listtile
└───safearea
extension MediaQueryExtension on BuildContext {
double dynamicWidth(double val) => MediaQuery.of(this).size.width * val;
double dynamicHeight(double val) => MediaQuery.of(this).size.height * val;

Answer 1

There is no written rule about the question you ask.
It usually depends on developers/company preferences.
But since the extension can be used project wide, the most reasonable place for it would be core/extensions.
I would not place it inside constants since it's not a constant values.