pkg/analyzer/lib/src/util/asserts.dart

// Copyright (c) 2015, 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.

library analyzer.src.util.asserts;

/**
 * Ensures that the given [value] is not null.
 * Otherwise throws an [ArgumentError].
 * An optional [description] is used in the error message.
 */
void notNull(Object value, [String description]) {
  if (value == null) {
    if (description == null) {
      throw new ArgumentError('Must not be null');
    } else {
      throw new ArgumentError('Must not be null: $description');
    }
  }
}