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There are a few ways to avoid using the BuildContext extension in Flutter:

1. Use a widget state management solution like provider, bloc, or getx. These state management solutions provide a way to access the context without needing a BuildContext extension.

2. Use named routes instead of passing context down the widget tree. With named routes, you can navigate to a new screen without having to pass context down the widget tree.

3. Use the GlobalKey approach to access child widgets' state. This approach allows you to keep a reference to the child widget without having to pass context.

4. Use a function or callback to pass data or events back up the widget tree instead of using context to access parent widgets.

By using these methods, you can reduce your dependency on the BuildContext extension and make your code more modular and scalable.