prefer_iterable_last

const numbers = [1, 2, 3];

final lastNumber = numbers[numbers.length - 1];
// or
final lastNumber = numbers.elementAt(numbers.length - 1);

const numbers = [1, 2, 3];
final lastNumber = numbers.last;

plugins:
  pyramid_lint: <version>
    diagnostics:
      prefer_iterable_last: true