fix(flutter_tool): remove stale shorebird build artifacts (#68)

Author: felangel

packages/flutter_tools/lib/src/build_system/targets/ios.dart

@@ -132,14 +132,20 @@ abstract class AotAssemblyBase extends Target {
       skipMissingInputs: true,
     );
 
+    // If the shorebird directory exists, delete it first.
+    final Directory shorebirdDir = environment.fileSystem.directory(environment.fileSystem.path.join(getIosBuildDirectory(), 'shorebird'));
+    if (shorebirdDir.existsSync()) {
+      shorebirdDir.deleteSync(recursive: true);
+    }
+
     // Copy the class table link information (generated by gen_snapshot) from the buildOutputPath to the iOS build directory.
     final File classTableLink = environment.fileSystem.file(environment.fileSystem.path.join(buildOutputPath, 'App.ct.link'));
     final File classTableLinkDebug = environment.fileSystem.file(environment.fileSystem.path.join(buildOutputPath, 'App.class_table.json'));
     if (classTableLink.existsSync()) {
-      classTableLink.copySync(environment.fileSystem.path.join(getIosBuildDirectory(), 'shorebird', 'App.ct.link'));
+      classTableLink.copySync(environment.fileSystem.path.join(shorebirdDir.path, 'App.ct.link'));
     }
     if (classTableLinkDebug.existsSync()) {
-      classTableLinkDebug.copySync(environment.fileSystem.path.join(getIosBuildDirectory(), 'shorebird', 'App.class_table.json'));
+      classTableLinkDebug.copySync(environment.fileSystem.path.join(shorebirdDir.path, 'App.class_table.json'));
     }
   }
 }