2021 basic structure for Flutter projects (Flutter version v1.22.5 by now).
This a simple (but clear) way to start a Flutter project, no that complex but easy to understand.
All files and clases related to data, like models, data sources and repositories.
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For models, can use a couple of packages like equatable and freezed that extends functionallity over simple Dart data clases.
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Data sources can be any kind of source, local or remote like firebase, an REST API, GraphQL, SharedPreferences or a local DB like sqlite or hive.
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A repository is an intermediary between state management and the data souce. Here, you can modify the way data will be displayed, like filtering. With this, we can switch beetween data sources in a repository and have a manteinable way to interact with data.
Here, you can create all files related to state management and business logic in general. Packages like bloc and riverpod can help with that.
A bloc for example can interact with a repository to fetch data.
Also, a providers section. Here, we can provide services like our repositories, a custom navigation service, a firebase auth or firestore service, etc.
We can divide this into two sections: screens for main views (home screen, details screen, login screen) and the widgets, the components that form the screens.
All files and clases that can be usefull for the project, like extensions, network interceptors, routes, etc.