anchor.diff:  
   /// Build app_flutter for web.
   Future<bool> _buildFlutterWebApp() async {
  +  /// Clean up previous build files to ensure this codebase is deployed.
  +  await Process.run('rm', <String>['-r', 'build/'], workingDirectory: flutterProjectDirectory);
  +  
     final Process process = await Process.start(
         'flutter', <String>['build', 'web'],
  -      workingDirectory: '../app_flutter');
  +      workingDirectory: flutterProjectDirectory);
     await stdout.addStream(process.stdout);
   
     return await process.exitCode == 0;
  
positive.code: 
  /// Copy the built project from app_flutter to this app_dart project.
  Future<bool> _copyFlutterApp() async {
    final ProcessResult result =
        await Process.run('cp', <String>['-r', '../app_flutter/build', 'build']);
  
    return result.exitCode == 0;
  }
  
negative.code: 
  import 'package:args/args.dart';
  import 'package:pedantic/pedantic.dart';
  
  const String flutterProjectDirectory = '../app_flutter';
  
  const String gcloudProjectIdFlag = 'project';
  const String gcloudProjectIdAbbrFlag = 'p';
  