Replace usages of @sealed annotation

app/lib/fake/backend/fake_pub_worker.dart

@@ -15,7 +15,6 @@ import 'package:gcloud/service_scope.dart';
 import 'package:http/http.dart';
 import 'package:http_parser/http_parser.dart';
 import 'package:indexed_blob/indexed_blob.dart';
-import 'package:meta/meta.dart';
 import 'package:pana/pana.dart';
 import 'package:path/path.dart' as p;
 import 'package:pub_dev/fake/backend/fake_pana_runner.dart';
@@ -303,8 +302,7 @@ Future<void> _upload(
       );
     }, retryIf: (e) => e is IOException || e is IntermittentUploadException);
 
-@sealed
-class UploadException implements Exception {
+final class UploadException implements Exception {
   final String message;
 
   UploadException(this.message);
@@ -313,8 +311,7 @@ class UploadException implements Exception {
   String toString() => message;
 }
 
-@sealed
-class IntermittentUploadException extends UploadException {
+final class IntermittentUploadException extends UploadException {
   IntermittentUploadException(String message) : super(message);
 }
 

app/lib/shared/configuration.dart

@@ -47,14 +47,13 @@ const _fakeExternalAudience = 'https://pub.dev';
 /// The configuration define the location of the Datastore with the
 /// package metadata and the Cloud Storage bucket for the actual package
 /// tar files.
-@sealed
 @JsonSerializable(
   anyMap: true,
   explicitToJson: true,
   checked: true,
   disallowUnrecognizedKeys: true,
 )
-class Configuration {
+final class Configuration {
   /// The name of the Cloud Storage bucket to use for storing the uploaded
   /// package archives.
   ///

app/lib/task/cloudcompute/cloudcompute.dart

@@ -2,8 +2,6 @@
 // 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.
 
-import 'package:meta/meta.dart';
-
 /// Interface describing an instance.
 abstract class CloudInstance {
   /// Unique instance name.
@@ -105,11 +103,10 @@ abstract class CloudCompute {
 ///
 /// The caller is expected to back-off using the zone for a while before trying
 /// to create new VMs in the zone again.
-@sealed
-class ZoneExhaustedException implements Exception {
+final class ZoneExhaustedException implements Exception {
   final String zone;
-
   final String message;
+
   ZoneExhaustedException(this.zone, this.message);
 
   @override
@@ -121,9 +118,9 @@ class ZoneExhaustedException implements Exception {
 ///
 /// The caller is expected to back-off for a while before trying to create
 /// new VMs.
-@sealed
-class QuotaExhaustedException implements Exception {
+final class QuotaExhaustedException implements Exception {
   final String message;
+
   QuotaExhaustedException(this.message);
 
   @override

app/lib/task/cloudcompute/fakecloudcompute.dart

@@ -8,7 +8,6 @@ import 'dart:io';
 import 'package:clock/clock.dart';
 import 'package:collection/collection.dart';
 import 'package:logging/logging.dart';
-import 'package:meta/meta.dart';
 import 'package:path/path.dart' as p;
 import 'package:pub_dev/frontend/static_files.dart';
 
@@ -18,8 +17,7 @@ final _log = Logger('pub.fakecloudcompute');
 
 typedef InstanceRunner = Future<void> Function(FakeCloudInstance instance);
 
-@sealed
-class FakeCloudCompute extends CloudCompute {
+final class FakeCloudCompute extends CloudCompute {
   var _nextInstanceId = 1;
   final _instances = <FakeCloudInstance>{};
   final InstanceRunner _instanceRunner;
@@ -221,8 +219,7 @@ Future<void> _defaultInstanceRunner(FakeCloudInstance instance) async {
   _log.info('pub_worker exit code: $exitCode');
 }
 
-@sealed
-class FakeCloudInstance extends CloudInstance {
+final class FakeCloudInstance extends CloudInstance {
   @override
   final String instanceName;
 

app/lib/task/cloudcompute/googlecloudcompute.dart

@@ -12,7 +12,6 @@ import 'package:googleapis/compute/v1.dart' hide Duration;
 import 'package:googleapis/compute/v1.dart' as compute_v1 show Duration;
 import 'package:http/http.dart' as http;
 import 'package:logging/logging.dart' show Logger;
-import 'package:meta/meta.dart';
 import 'package:pub_dev/shared/utils.dart' show createUuid;
 import 'package:pub_dev/task/cloudcompute/cloudcompute.dart';
 import 'package:retry/retry.dart';
@@ -221,7 +220,7 @@ Future<void> deleteAbandonedInstances({
   }
 }
 
-class _GoogleCloudInstance extends CloudInstance {
+final class _GoogleCloudInstance extends CloudInstance {
   /// GCP zone this instance exists inside.
   @override
   final String zone;
@@ -248,7 +247,7 @@ class _GoogleCloudInstance extends CloudInstance {
   }
 }
 
-class _PendingGoogleCloudInstance extends CloudInstance {
+final class _PendingGoogleCloudInstance extends CloudInstance {
   /// GCP zone this instance exists inside.
   @override
   final String zone;
@@ -304,8 +303,7 @@ final _validInstanceNamePattern = RegExp(r'^[a-z]([-a-z0-9]*[a-z0-9])?$');
 String _shellSingleQuote(String string) =>
     "'${string.replaceAll("'", "'\\''")}'";
 
-@sealed
-class _GoogleCloudCompute extends CloudCompute {
+final class _GoogleCloudCompute extends CloudCompute {
   final ComputeApi _api;
 
   /// GCP project this instance is managing VMs inside.

app/test/task/fake_time.dart

@@ -7,7 +7,6 @@ import 'dart:math';
 
 import 'package:clock/clock.dart';
 import 'package:collection/collection.dart';
-import 'package:meta/meta.dart' show sealed;
 
 // TODO(jonasfj): Document this concept, maybe give it a better name and see if
 //                we can publish it as a separate package. Maybe, it should be
@@ -16,8 +15,7 @@ import 'package:meta/meta.dart' show sealed;
 //                Or something else clever, without being too clever!
 //                Or maybe we should rename _TravelingTimer to _FakeTimer.
 
-@sealed
-abstract class FakeTime {
+abstract final class FakeTime {
   FakeTime._();
 
   Future<void> elapse({
@@ -88,7 +86,7 @@ abstract class FakeTime {
   }
 }
 
-class _FakeTime extends FakeTime {
+final class _FakeTime extends FakeTime {
   final DateTime Function() _originalTime;
   Duration _offset;
 

pkg/_pub_shared/lib/data/task_payload.dart

@@ -5,14 +5,12 @@
 import 'dart:collection';
 
 import 'package:json_annotation/json_annotation.dart';
-import 'package:meta/meta.dart';
 
 part 'task_payload.g.dart';
 
 /// JSON payload given as single argument to the `pub_worker.dart` command.
-@sealed
 @JsonSerializable()
-class Payload {
+final class Payload {
   /// Package name of the package to be processed.
   final String package;
 
@@ -49,9 +47,8 @@ class Payload {
 }
 
 /// Pair of [version] and [token].
-@sealed
 @JsonSerializable()
-class VersionTokenPair {
+final class VersionTokenPair {
   /// Version of [Payload.package] to be processed.
   final String version;
 

pkg/indexed_blob/lib/indexed_blob.dart

@@ -23,7 +23,6 @@ import 'dart:convert' show utf8;
 import 'dart:typed_data';
 import 'package:jsontool/jsontool.dart'
     show JsonReader, jsonStringWriter, JsonSink;
-import 'package:meta/meta.dart';
 
 export 'src/blobindexpair.dart' show BlobIndexPair;
 
@@ -48,8 +47,7 @@ export 'src/blobindexpair.dart' show BlobIndexPair;
 /// // Finish building, and create the index
 /// await File('mydata.index').writeBytes();
 /// ```
-@sealed
-class IndexedBlobBuilder {
+final class IndexedBlobBuilder {
   final StreamSink<List<int>> _blob;
   int _offset = 0;
   final Map<String, dynamic> _index = {};
@@ -225,8 +223,7 @@ bool _skipUntilKey(JsonReader r, String key) {
 /// }
 /// ```
 ///
-@sealed
-class BlobIndex {
+final class BlobIndex {
   final Uint8List _indexFile;
 
   /// Create [BlobIndex] from [indexFile] contents.
@@ -411,8 +408,7 @@ class BlobIndex {
 }
 
 /// Range of a file in an indexed-blob.
-@sealed
-class FileRange {
+final class FileRange {
   /// Path that was looked up in [BlobIndex].
   final String path;
 

pkg/indexed_blob/lib/src/blobindexpair.dart

@@ -7,13 +7,11 @@ import 'dart:io' show Directory, File, gzip;
 import 'dart:typed_data' show Uint8List;
 
 import 'package:async/async.dart';
-import 'package:meta/meta.dart';
 import 'package:path/path.dart' as p;
 import '../indexed_blob.dart' show IndexedBlobBuilder, BlobIndex;
 
 /// Pair containing and in-memory [blob] and matching [index].
-@sealed
-class BlobIndexPair {
+final class BlobIndexPair {
   /// Blob indexed by [index].
   final Uint8List blob;
 

pkg/pub_worker/lib/src/sdks.dart

@@ -5,12 +5,10 @@
 import 'dart:io';
 
 import 'package:collection/collection.dart';
-import 'package:meta/meta.dart';
 import 'package:path/path.dart' as p;
 import 'package:pub_semver/pub_semver.dart' show Version;
 
-@sealed
-class InstalledSdk {
+final class InstalledSdk {
   final String kind;
   final String path;
   final Version version;

pkg/pub_worker/lib/src/upload.dart

@@ -10,7 +10,6 @@ import 'package:http/http.dart'
     show Client, ClientException, MultipartFile, MultipartRequest, Response;
 import 'package:http_parser/http_parser.dart' show MediaType;
 import 'package:logging/logging.dart' show Logger;
-import 'package:meta/meta.dart';
 import 'package:retry/retry.dart' show retry;
 
 final _log = Logger('pub_worker.upload');
@@ -69,8 +68,7 @@ Future<void> upload(
             e is TimeoutException,
         delayFactor: Duration(seconds: 5));
 
-@sealed
-class UploadException implements Exception {
+final class UploadException implements Exception {
   final String message;
 
   UploadException(this.message);
@@ -79,7 +77,6 @@ class UploadException implements Exception {
   String toString() => message;
 }
 
-@sealed
-class IntermittentUploadException extends UploadException {
+final class IntermittentUploadException extends UploadException {
   IntermittentUploadException(String message) : super(message);
 }