FutureBuilder<T> constructor Null safety

const FutureBuilder<T>(
  1. {Key? key,
  2. Future<T>? future,
  3. T? initialData,
  4. required AsyncWidgetBuilder<T> builder}
)

Creates a widget that builds itself based on the latest snapshot of interaction with a Future.

The builder must not be null.

Implementation

const FutureBuilder({
  Key? key,
  this.future,
  this.initialData,
  required this.builder,
}) : assert(builder != null),
     super(key: key);