If you use VScode just press F5
Otherwise run the command in the root folder:
$ flutter run
$ flutter run -d web-server --web-renderer canvaskit --web-hostname localhost --web-port 8080
This project generates localized messages based on arb files found in the lib/l10n directory.
More information here
flutter build web --release --base-href "/" --web-renderer canvaskit
dart run build_runner build --delete-conflicting-outputs