GenUiFuzzHost typedef
Puts a rendered surface inside the app it is drawn in, for genUiFuzz.
Components often lean on what their app provides: a ThemeExtension the
app's theme carries, localizations, an inherited service. Drawn without
those ancestors, every component fails on the same missing ancestor, and
the run reports that instead of anything the schema allows.
Implementation
typedef GenUiFuzzHost = Widget Function(Widget surface);