| // Copyright (c) 2016, 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. |
| |
| /// Collects definitions provided to the compiler via the `-D` flag. |
| /// |
| /// Environment variables can be used in the user code in two ways. From |
| /// conditional imports, and from `const String.fromEnvironment` and |
| /// other similar constructors. |
| abstract class Environment { |
| /// Return the string value of the given key. |
| /// |
| /// Note that `bool.fromEnvironment` and `int.fromEnvironment` are also |
| /// implemented in terms of `String.fromEnvironment`. |
| String valueOf(String key); |
| } |
