pkg/analysis_server/lib/src/utilities/extensions/list.dart - sdk - Git at Google

 // Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.

 extension ListExtensions<T> on List<T> {
   /// Returns `null` if this list is empty, otherwise `this`.
   List<T>? get nullIfEmpty => isEmpty ? null : this;
 }
	// Copyright (c) 2026, the Dart project authors. Please see the AUTHORS file
	// for details. All rights reserved. Use of this source code is governed by a
	// BSD-style license that can be found in the LICENSE file.

	extension ListExtensions<T> on List<T> {
	/// Returns `null` if this list is empty, otherwise `this`.
	List<T>? get nullIfEmpty => isEmpty ? null : this;
	}