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avoid-unnecessary-collections

added in: 1.15.0
warning

Warns when a collection literal can be replaced by its first and only element.

Example​

❌ Bad:

Future<void> fn() async {
  await Future.wait([future]); // LINT
  await Future.any([future]); // LINT
  
  _array.addAll([value]); // LINT
  _array.addAll({value}); // LINT

  Stream.fromFutures([future]); // LINT
  Stream.fromIterable([value]); // LINT

  set.addAll([value]); // LINT
  set.containsAll([value]); // LINT
}

✅ Good:

Future<void> fn() async {
  await future;
  
  _array.add(value);

  Stream.fromFuture(future);
  Stream.value(value);

  set.add(value);
  set.contains(value);
}