I would like to ask you some questions about Flutter

[StevenCoober]

Regarding this project, your colleague Marvpaul on GitHub recommended to me. The question is as follows:
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project: https://github.com/marvpaul/flutter-meditation

issue: I want to change the time to 1 hour and repackage it, but the code is missing like meditation_model.freezed.dart meditation_model.g.dart session_parameter_model.freezed.dart , etc

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I hope you can help me. Thank you