Since the widget previewer is a Flutter web application, native plugins and dart:io won't be supported. Since it's still possible to import dart:io and invoke Dart code for native plugins, the widget previewer should catch these classes of exceptions and inform developers that their preview can't be displayed.

Ideally, an error widget will be shown in the place of the user's preview explaining what caused the crash with links to documentation on possible solutions to resolve the issue (e.g., refactoring widgets to separate business logic from UI logic).