GenerateAppTitle typedef
The signature of WidgetsApp.onGenerateTitle.
Used to generate a value for the app's Title.title, which the device uses
to identify the app for the user. The context includes the WidgetsApp's
Localizations widget so that this method can be used to produce a
localized title.
This function must not return null.
Implementation
typedef GenerateAppTitle = String Function(BuildContext context);