when<TResult extends Object?> method Null safety

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. {required TResult start(
      ),
    1. required TResult center(
        )}
      )
      @optionalTypeArgs, inherited

      Implementation

      @optionalTypeArgs
TResult when<TResult extends Object?>({
  required TResult Function() start,
  required TResult Function() center,
}) =>
    throw _privateConstructorUsedError;