call method
Implementation
@override
Object? call(Interpreter interpreter, List<Object?> arguments,
Map<Symbol, Object?> namedArguments) {
var child = namedArguments[const Symbol('child')];
if (child == null) {
throw "child required in Expanded";
}
int flex = 1;
var flexParsed = namedArguments[const Symbol('flex')];
if (flexParsed != null) {
flex = flexParsed as int;
}
return Expanded(
flex: flex,
child: child as Widget,
);
}