Dart analyzer is not parsing the dynamic generated files

It may help to run "Synchronize" -- bound by default to Ctrl-Q.

You can restart the analyzer on the dart analysis tab, in the top left is a button with arrows running in a circle, if you hover over it it says 'Restart Dart Analysis Server'.

Example picture

first check this article : https://flutter.dev/docs/development/data-and-backend/json and make sure of all steps : 1- add dependencies in pubspec.yaml 2- flutter pub get 3- flutter pub upgrade 4- flutter pub run build_runner build

after all, consider that:

part 'timeline.g.dart';

most be your file name which classes are in!

if your file name is difference with your class name, you should use your file name.