tp7309 / flutter_sticky_and_expandable_list

The headerBuilder parameter to SliverExpandableChildDelegate is nullable but its implementation expects a value.

flutter_sticky_and_expandable_list/lib/src/sliver_expandable_list.dart

Line 172 in 9a15258

..header = headerBuilder!(context, sectionIndex, sectionRealIndex)

sectionBuilder or headerBuilder, at least one.

Perhaps this assert

flutter_sticky_and_expandable_list/lib/src/sliver_expandable_list.dart

Line 135 in 9a15258

: assert(headerBuilder == null || sectionBuilder == null),

could become

      : assert(
          (headerBuilder != null && sectionBuilder == null) ||
              (headerBuilder == null && sectionBuilder != null),
          'You must specify either headerBuilder or sectionBuilder.',
        ),

ok, i will commit it.

Null check operator exception on headerBuilder