pkgs/platform/example/bin/tree_shake.dart

// Copyright (c) 2024, 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.

/// Example of tree shaking using boolean properties of the target platforms.
///
/// Compile this file for a specific platform, for example as:
/// ```console
/// dart compile exe --target-os=linux tree_shake.dart
/// dart compile js -o tree_shake.js tree_shake.dart
/// ```
/// and check that the executable does not contain the strings for
/// other platforms. For example on Linux, use:
/// ```console
/// strings tree_shake.{exe,js} | grep "RUNNING"
/// ```
/// and check that the only retained value is either `RUNNING ON LINUX` or
/// `RUNNING IN A BROWSER`.
library;

import 'package:platform/platform.dart';

void main() {
  const expectedPlatform = bool.fromEnvironment('dart.library.js_interop')
      ? 'browser'
      : bool.fromEnvironment('dart.library.io')
      ? 'native'
      : 'unknown';
  print('Expected platform: $expectedPlatform');

  if (BrowserPlatform.current case var browser?) {
    print('RUNNING IN A BROWSER');
    print(browser.userAgent);
  } else if (NativePlatform.current case var native?) {
    if (native.isLinux) {
      print('RUNNING ON LINUX');
    } else if (native.isMacOS) {
      print('RUNNING ON MACOS');
    } else if (native.isWindows) {
      print('RUNNING ON WINDOWS');
    }
  }
}