prefer-null-aware-spread

v1.11.0

style

recommended

pro+

Warns when a null check inside a collection literal can be replaced with a null-aware spread (...?).

Example

❌ Bad:

void fn() {
  final Set<String>? localSet = <String>{};

  final collection = [
    // LINT: Prefer null-aware spread (...?) instead of checking for a potential null value.
    if (localSet != null) ...localSet,
    // LINT: Prefer null-aware spread (...?) with the then branch expression.
    ...localSet != null ? localSet : <String>{},
    // LINT: Prefer null-aware spread (...?) instead of if-null (??).
    ...localSet ?? {},
  ];
}

✅ Good:

void fn() {
  final Set<String>? localSet = <String>{};

  final collection = [
    ...?localSet,
    ...?localSet,
    ...?localSet,
  ];
}

Related Rules

• avoid-empty-spread