Refactor the vendored protos (#1000)

diff --git a/.gitignore b/.gitignore
index 5b83f42..a189518 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,4 @@
-.children
 .dart_tool/
-.idea
-.packages
 .pub
 build/
 pubspec.lock
diff --git a/benchmarks/.gitignore b/benchmarks/.gitignore
index c766086..a6779a9 100644
--- a/benchmarks/.gitignore
+++ b/benchmarks/.gitignore
@@ -1,2 +1,5 @@
+# Generated by pub
+.dart_tool/
+pubspec.lock
+
 lib/generated/
-out/
diff --git a/protoc_plugin/.gitignore b/protoc_plugin/.gitignore
index 40fd954..1f4e744 100644
--- a/protoc_plugin/.gitignore
+++ b/protoc_plugin/.gitignore
@@ -1,12 +1,6 @@
 # Generated by pub
 .dart_tool/
-.packages
 pubspec.lock
 
 # Other generated files
-benchmark/data/pubspec.link.yaml
-benchmark/data/pubspec.link.lock
-benchmark/data/hostname.txt
-benchmark/data/latest_vm.pb.json
-benchmark/lib/generated
 out/
diff --git a/protoc_plugin/Makefile b/protoc_plugin/Makefile
index 9b68b43..c7379fb 100644
--- a/protoc_plugin/Makefile
+++ b/protoc_plugin/Makefile
@@ -77,38 +77,36 @@
 TEST_PROTO_SRCS=$(foreach proto, $(TEST_PROTO_LIST), \
   $(TEST_PROTO_SRC_DIR)/$(proto).proto)
 
-PREGENERATED_SRCS=protos/descriptor.proto protos/client.proto protos/plugin.proto protos/dart_options.proto
+PREGENERATED_SRCS := $(shell find protos -name '*.proto')
 
 $(TEST_PROTO_LIBS): $(PLUGIN_SRC) $(TEST_PROTO_SRCS)
 	mkdir -p $(TEST_PROTO_DIR)
 
 	protoc\
-		--experimental_allow_proto3_optional\
 		--dart_out="disable_constructor_args:$(TEST_PROTO_DIR)"\
-		-Iprotos\
 		-I$(TEST_PROTO_SRC_DIR)\
+		-Iprotos\
 		--plugin=protoc-gen-dart=$(realpath $(PLUGIN_PATH))\
 		$(TEST_PROTO_SRCS)
 
 	mkdir -p $(TEST_PROTO_DIR)/constructor_args
 
 	protoc\
-		--experimental_allow_proto3_optional\
 		--dart_out="$(TEST_PROTO_DIR)/constructor_args"\
-		-Iprotos\
 		-I$(TEST_PROTO_SRC_DIR)\
+		-Iprotos\
 		--plugin=protoc-gen-dart=$(realpath $(PLUGIN_PATH))\
 		$(TEST_PROTO_SRCS)
 
 	dart format $(TEST_PROTO_DIR)
 
 update-pregenerated: $(PLUGIN_PATH) $(PREGENERATED_SRCS)
-	protoc --dart_out=lib/src/generated -Iprotos --plugin=protoc-gen-dart=$(realpath $(PLUGIN_PATH)) $(PREGENERATED_SRCS)
-	rm lib/src/generated/client.pb{json,server}.dart
-	rm lib/src/generated/descriptor.pb{json,server}.dart
-	rm lib/src/generated/dart_options.pb{enum,json,server}.dart
-	rm lib/src/generated/plugin.pb{json,server}.dart
-	dart format lib/src/generated
+	protoc --dart_out=lib/src/gen \
+	  -Iprotos \
+		--plugin=protoc-gen-dart=$(realpath $(PLUGIN_PATH)) $(PREGENERATED_SRCS)
+	find lib/src/gen -name '*.pbjson.dart' -delete
+	find lib/src/gen -name '*.pbserver.dart' -delete
+	dart format lib/src/gen
 
 protos: $(PLUGIN_PATH) $(TEST_PROTO_LIBS)
 
diff --git a/protoc_plugin/lib/indenting_writer.dart b/protoc_plugin/lib/indenting_writer.dart
index 307b785..641cc0a 100644
--- a/protoc_plugin/lib/indenting_writer.dart
+++ b/protoc_plugin/lib/indenting_writer.dart
@@ -4,7 +4,7 @@
 
 import 'dart:collection';
 
-import 'src/generated/descriptor.pb.dart';
+import 'src/gen/google/protobuf/descriptor.pb.dart';
 
 /// Specifies code locations where metadata annotations should be attached and
 /// where they should point to in the original proto.
@@ -184,6 +184,9 @@
       _packageExports.isNotEmpty ||
       _fileExports.isNotEmpty;
 
+  bool get hasSrcImport =>
+      _packageImports.any((item) => item.contains('/src/'));
+
   /// Add an import with an optional import prefix.
   void addImport(String url, {String? prefix}) {
     final directive =
diff --git a/protoc_plugin/lib/names.dart b/protoc_plugin/lib/names.dart
index 99d666a..52460c4 100644
--- a/protoc_plugin/lib/names.dart
+++ b/protoc_plugin/lib/names.dart
@@ -6,8 +6,8 @@
 
 import 'package:protobuf/meta.dart';
 
-import 'src/generated/dart_options.pb.dart';
-import 'src/generated/descriptor.pb.dart';
+import 'src/gen/dart_options.pb.dart';
+import 'src/gen/google/protobuf/descriptor.pb.dart';
 
 class MemberNames {
   List<FieldNames> fieldNames;
diff --git a/protoc_plugin/lib/protoc.dart b/protoc_plugin/lib/protoc.dart
index 8020405..424a4a0 100644
--- a/protoc_plugin/lib/protoc.dart
+++ b/protoc_plugin/lib/protoc.dart
@@ -7,10 +7,10 @@
 import 'mixins.dart';
 import 'names.dart';
 import 'src/code_generator.dart';
-import 'src/generated/client.pb.dart';
-import 'src/generated/dart_options.pb.dart';
-import 'src/generated/descriptor.pb.dart';
-import 'src/generated/plugin.pb.dart';
+import 'src/gen/dart_options.pb.dart';
+import 'src/gen/google/api/client.pb.dart';
+import 'src/gen/google/protobuf/compiler/plugin.pb.dart';
+import 'src/gen/google/protobuf/descriptor.pb.dart';
 import 'src/linker.dart';
 import 'src/options.dart';
 import 'src/output_config.dart';
diff --git a/protoc_plugin/lib/src/code_generator.dart b/protoc_plugin/lib/src/code_generator.dart
index 45cfe55..7e15cd0 100644
--- a/protoc_plugin/lib/src/code_generator.dart
+++ b/protoc_plugin/lib/src/code_generator.dart
@@ -11,9 +11,9 @@
 
 import '../names.dart' show lowerCaseFirstLetter;
 import '../protoc.dart' show FileGenerator;
-import 'generated/client.pb.dart';
-import 'generated/dart_options.pb.dart';
-import 'generated/plugin.pb.dart';
+import 'gen/dart_options.pb.dart';
+import 'gen/google/api/client.pb.dart';
+import 'gen/google/protobuf/compiler/plugin.pb.dart';
 import 'linker.dart';
 import 'options.dart';
 import 'output_config.dart';
diff --git a/protoc_plugin/lib/src/file_generator.dart b/protoc_plugin/lib/src/file_generator.dart
index cb06ca0..40306aa 100644
--- a/protoc_plugin/lib/src/file_generator.dart
+++ b/protoc_plugin/lib/src/file_generator.dart
@@ -303,8 +303,6 @@
   /// Writes the header and imports for the .pb.dart file.
   void writeMainHeader(IndentingWriter out,
       [OutputConfiguration config = const DefaultOutputConfiguration()]) {
-    _writeHeading(out);
-
     final importWriter = ImportWriter();
 
     // We only add the dart:async import if there are generic client API
@@ -356,6 +354,14 @@
       importWriter.addExport(url.toString());
     }
 
+    // The well-known-types mixins create src/ refs into package:protobuf; we
+    // should likely refactor this so they're regular (non-src/) references.
+    //
+    // For now, we surpress the analysis warning.
+    _writeHeading(out, extraIgnores: {
+      if (importWriter.hasSrcImport) 'implementation_imports',
+    });
+
     out.println(importWriter.emit());
   }
 
diff --git a/protoc_plugin/lib/src/generated/dart_options.pb.dart b/protoc_plugin/lib/src/gen/dart_options.pb.dart
similarity index 100%
rename from protoc_plugin/lib/src/generated/dart_options.pb.dart
rename to protoc_plugin/lib/src/gen/dart_options.pb.dart
diff --git a/protoc_plugin/lib/src/gen/dart_options.pbenum.dart b/protoc_plugin/lib/src/gen/dart_options.pbenum.dart
new file mode 100644
index 0000000..ab0e780
--- /dev/null
+++ b/protoc_plugin/lib/src/gen/dart_options.pbenum.dart
@@ -0,0 +1,10 @@
+//
+//  Generated code. Do not modify.
+//  source: dart_options.proto
+//
+// @dart = 3.3
+
+// ignore_for_file: annotate_overrides, camel_case_types, comment_references
+// ignore_for_file: constant_identifier_names, library_prefixes
+// ignore_for_file: non_constant_identifier_names, prefer_final_fields
+// ignore_for_file: unnecessary_import, unnecessary_this, unused_import
diff --git a/protoc_plugin/lib/src/generated/client.pb.dart b/protoc_plugin/lib/src/gen/google/api/client.pb.dart
similarity index 69%
rename from protoc_plugin/lib/src/generated/client.pb.dart
rename to protoc_plugin/lib/src/gen/google/api/client.pb.dart
index dfccc2d..3aa47fc 100644
--- a/protoc_plugin/lib/src/generated/client.pb.dart
+++ b/protoc_plugin/lib/src/gen/google/api/client.pb.dart
@@ -1,6 +1,6 @@
 //
 //  Generated code. Do not modify.
-//  source: client.proto
+//  source: google/api/client.proto
 //
 // @dart = 3.3
 
@@ -13,7 +13,9 @@
 
 import 'package:protobuf/protobuf.dart' as $pb;
 
+import '../protobuf/duration.pb.dart' as $0;
 import 'client.pbenum.dart';
+import 'launch_stage.pbenum.dart' as $1;
 
 export 'package:protobuf/protobuf.dart' show GeneratedMessageGenericExtensions;
 
@@ -123,11 +125,284 @@
   SelectiveGapicGeneration ensureSelectiveGapicGeneration() => $_ensure(2);
 }
 
+/// Details about how and where to publish client libraries.
+class ClientLibrarySettings extends $pb.GeneratedMessage {
+  factory ClientLibrarySettings({
+    $core.String? version,
+    $1.LaunchStage? launchStage,
+    $core.bool? restNumericEnums,
+    JavaSettings? javaSettings,
+    CppSettings? cppSettings,
+    PhpSettings? phpSettings,
+    PythonSettings? pythonSettings,
+    NodeSettings? nodeSettings,
+    DotnetSettings? dotnetSettings,
+    RubySettings? rubySettings,
+    GoSettings? goSettings,
+  }) {
+    final $result = create();
+    if (version != null) {
+      $result.version = version;
+    }
+    if (launchStage != null) {
+      $result.launchStage = launchStage;
+    }
+    if (restNumericEnums != null) {
+      $result.restNumericEnums = restNumericEnums;
+    }
+    if (javaSettings != null) {
+      $result.javaSettings = javaSettings;
+    }
+    if (cppSettings != null) {
+      $result.cppSettings = cppSettings;
+    }
+    if (phpSettings != null) {
+      $result.phpSettings = phpSettings;
+    }
+    if (pythonSettings != null) {
+      $result.pythonSettings = pythonSettings;
+    }
+    if (nodeSettings != null) {
+      $result.nodeSettings = nodeSettings;
+    }
+    if (dotnetSettings != null) {
+      $result.dotnetSettings = dotnetSettings;
+    }
+    if (rubySettings != null) {
+      $result.rubySettings = rubySettings;
+    }
+    if (goSettings != null) {
+      $result.goSettings = goSettings;
+    }
+    return $result;
+  }
+  ClientLibrarySettings._() : super();
+  factory ClientLibrarySettings.fromBuffer($core.List<$core.int> i,
+          [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromBuffer(i, r);
+  factory ClientLibrarySettings.fromJson($core.String i,
+          [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(
+      _omitMessageNames ? '' : 'ClientLibrarySettings',
+      package: const $pb.PackageName(_omitMessageNames ? '' : 'google.api'),
+      createEmptyInstance: create)
+    ..aOS(1, _omitFieldNames ? '' : 'version')
+    ..e<$1.LaunchStage>(
+        2, _omitFieldNames ? '' : 'launchStage', $pb.PbFieldType.OE,
+        defaultOrMaker: $1.LaunchStage.LAUNCH_STAGE_UNSPECIFIED,
+        valueOf: $1.LaunchStage.valueOf,
+        enumValues: $1.LaunchStage.values)
+    ..aOB(3, _omitFieldNames ? '' : 'restNumericEnums')
+    ..aOM<JavaSettings>(21, _omitFieldNames ? '' : 'javaSettings',
+        subBuilder: JavaSettings.create)
+    ..aOM<CppSettings>(22, _omitFieldNames ? '' : 'cppSettings',
+        subBuilder: CppSettings.create)
+    ..aOM<PhpSettings>(23, _omitFieldNames ? '' : 'phpSettings',
+        subBuilder: PhpSettings.create)
+    ..aOM<PythonSettings>(24, _omitFieldNames ? '' : 'pythonSettings',
+        subBuilder: PythonSettings.create)
+    ..aOM<NodeSettings>(25, _omitFieldNames ? '' : 'nodeSettings',
+        subBuilder: NodeSettings.create)
+    ..aOM<DotnetSettings>(26, _omitFieldNames ? '' : 'dotnetSettings',
+        subBuilder: DotnetSettings.create)
+    ..aOM<RubySettings>(27, _omitFieldNames ? '' : 'rubySettings',
+        subBuilder: RubySettings.create)
+    ..aOM<GoSettings>(28, _omitFieldNames ? '' : 'goSettings',
+        subBuilder: GoSettings.create)
+    ..hasRequiredFields = false;
+
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  ClientLibrarySettings clone() =>
+      ClientLibrarySettings()..mergeFromMessage(this);
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  ClientLibrarySettings copyWith(
+          void Function(ClientLibrarySettings) updates) =>
+      super.copyWith((message) => updates(message as ClientLibrarySettings))
+          as ClientLibrarySettings;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static ClientLibrarySettings create() => ClientLibrarySettings._();
+  ClientLibrarySettings createEmptyInstance() => create();
+  static $pb.PbList<ClientLibrarySettings> createRepeated() =>
+      $pb.PbList<ClientLibrarySettings>();
+  @$core.pragma('dart2js:noInline')
+  static ClientLibrarySettings getDefault() => _defaultInstance ??=
+      $pb.GeneratedMessage.$_defaultFor<ClientLibrarySettings>(create);
+  static ClientLibrarySettings? _defaultInstance;
+
+  /// Version of the API to apply these settings to. This is the full protobuf
+  /// package for the API, ending in the version element.
+  /// Examples: "google.cloud.speech.v1" and "google.spanner.admin.database.v1".
+  @$pb.TagNumber(1)
+  $core.String get version => $_getSZ(0);
+  @$pb.TagNumber(1)
+  set version($core.String v) {
+    $_setString(0, v);
+  }
+
+  @$pb.TagNumber(1)
+  $core.bool hasVersion() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearVersion() => $_clearField(1);
+
+  /// Launch stage of this version of the API.
+  @$pb.TagNumber(2)
+  $1.LaunchStage get launchStage => $_getN(1);
+  @$pb.TagNumber(2)
+  set launchStage($1.LaunchStage v) {
+    $_setField(2, v);
+  }
+
+  @$pb.TagNumber(2)
+  $core.bool hasLaunchStage() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearLaunchStage() => $_clearField(2);
+
+  /// When using transport=rest, the client request will encode enums as
+  /// numbers rather than strings.
+  @$pb.TagNumber(3)
+  $core.bool get restNumericEnums => $_getBF(2);
+  @$pb.TagNumber(3)
+  set restNumericEnums($core.bool v) {
+    $_setBool(2, v);
+  }
+
+  @$pb.TagNumber(3)
+  $core.bool hasRestNumericEnums() => $_has(2);
+  @$pb.TagNumber(3)
+  void clearRestNumericEnums() => $_clearField(3);
+
+  /// Settings for legacy Java features, supported in the Service YAML.
+  @$pb.TagNumber(21)
+  JavaSettings get javaSettings => $_getN(3);
+  @$pb.TagNumber(21)
+  set javaSettings(JavaSettings v) {
+    $_setField(21, v);
+  }
+
+  @$pb.TagNumber(21)
+  $core.bool hasJavaSettings() => $_has(3);
+  @$pb.TagNumber(21)
+  void clearJavaSettings() => $_clearField(21);
+  @$pb.TagNumber(21)
+  JavaSettings ensureJavaSettings() => $_ensure(3);
+
+  /// Settings for C++ client libraries.
+  @$pb.TagNumber(22)
+  CppSettings get cppSettings => $_getN(4);
+  @$pb.TagNumber(22)
+  set cppSettings(CppSettings v) {
+    $_setField(22, v);
+  }
+
+  @$pb.TagNumber(22)
+  $core.bool hasCppSettings() => $_has(4);
+  @$pb.TagNumber(22)
+  void clearCppSettings() => $_clearField(22);
+  @$pb.TagNumber(22)
+  CppSettings ensureCppSettings() => $_ensure(4);
+
+  /// Settings for PHP client libraries.
+  @$pb.TagNumber(23)
+  PhpSettings get phpSettings => $_getN(5);
+  @$pb.TagNumber(23)
+  set phpSettings(PhpSettings v) {
+    $_setField(23, v);
+  }
+
+  @$pb.TagNumber(23)
+  $core.bool hasPhpSettings() => $_has(5);
+  @$pb.TagNumber(23)
+  void clearPhpSettings() => $_clearField(23);
+  @$pb.TagNumber(23)
+  PhpSettings ensurePhpSettings() => $_ensure(5);
+
+  /// Settings for Python client libraries.
+  @$pb.TagNumber(24)
+  PythonSettings get pythonSettings => $_getN(6);
+  @$pb.TagNumber(24)
+  set pythonSettings(PythonSettings v) {
+    $_setField(24, v);
+  }
+
+  @$pb.TagNumber(24)
+  $core.bool hasPythonSettings() => $_has(6);
+  @$pb.TagNumber(24)
+  void clearPythonSettings() => $_clearField(24);
+  @$pb.TagNumber(24)
+  PythonSettings ensurePythonSettings() => $_ensure(6);
+
+  /// Settings for Node client libraries.
+  @$pb.TagNumber(25)
+  NodeSettings get nodeSettings => $_getN(7);
+  @$pb.TagNumber(25)
+  set nodeSettings(NodeSettings v) {
+    $_setField(25, v);
+  }
+
+  @$pb.TagNumber(25)
+  $core.bool hasNodeSettings() => $_has(7);
+  @$pb.TagNumber(25)
+  void clearNodeSettings() => $_clearField(25);
+  @$pb.TagNumber(25)
+  NodeSettings ensureNodeSettings() => $_ensure(7);
+
+  /// Settings for .NET client libraries.
+  @$pb.TagNumber(26)
+  DotnetSettings get dotnetSettings => $_getN(8);
+  @$pb.TagNumber(26)
+  set dotnetSettings(DotnetSettings v) {
+    $_setField(26, v);
+  }
+
+  @$pb.TagNumber(26)
+  $core.bool hasDotnetSettings() => $_has(8);
+  @$pb.TagNumber(26)
+  void clearDotnetSettings() => $_clearField(26);
+  @$pb.TagNumber(26)
+  DotnetSettings ensureDotnetSettings() => $_ensure(8);
+
+  /// Settings for Ruby client libraries.
+  @$pb.TagNumber(27)
+  RubySettings get rubySettings => $_getN(9);
+  @$pb.TagNumber(27)
+  set rubySettings(RubySettings v) {
+    $_setField(27, v);
+  }
+
+  @$pb.TagNumber(27)
+  $core.bool hasRubySettings() => $_has(9);
+  @$pb.TagNumber(27)
+  void clearRubySettings() => $_clearField(27);
+  @$pb.TagNumber(27)
+  RubySettings ensureRubySettings() => $_ensure(9);
+
+  /// Settings for Go client libraries.
+  @$pb.TagNumber(28)
+  GoSettings get goSettings => $_getN(10);
+  @$pb.TagNumber(28)
+  set goSettings(GoSettings v) {
+    $_setField(28, v);
+  }
+
+  @$pb.TagNumber(28)
+  $core.bool hasGoSettings() => $_has(10);
+  @$pb.TagNumber(28)
+  void clearGoSettings() => $_clearField(28);
+  @$pb.TagNumber(28)
+  GoSettings ensureGoSettings() => $_ensure(10);
+}
+
 /// This message configures the settings for publishing [Google Cloud Client
 /// libraries](https://cloud.google.com/apis/docs/cloud-client-libraries)
 /// generated from the service config.
 class Publishing extends $pb.GeneratedMessage {
   factory Publishing({
+    $core.Iterable<MethodSettings>? methodSettings,
     $core.String? newIssueUri,
     $core.String? documentationUri,
     $core.String? apiShortName,
@@ -135,10 +410,14 @@
     $core.Iterable<$core.String>? codeownerGithubTeams,
     $core.String? docTagPrefix,
     ClientLibraryOrganization? organization,
+    $core.Iterable<ClientLibrarySettings>? librarySettings,
     $core.String? protoReferenceDocumentationUri,
     $core.String? restReferenceDocumentationUri,
   }) {
     final $result = create();
+    if (methodSettings != null) {
+      $result.methodSettings.addAll(methodSettings);
+    }
     if (newIssueUri != null) {
       $result.newIssueUri = newIssueUri;
     }
@@ -160,6 +439,9 @@
     if (organization != null) {
       $result.organization = organization;
     }
+    if (librarySettings != null) {
+      $result.librarySettings.addAll(librarySettings);
+    }
     if (protoReferenceDocumentationUri != null) {
       $result.protoReferenceDocumentationUri = protoReferenceDocumentationUri;
     }
@@ -180,6 +462,9 @@
       _omitMessageNames ? '' : 'Publishing',
       package: const $pb.PackageName(_omitMessageNames ? '' : 'google.api'),
       createEmptyInstance: create)
+    ..pc<MethodSettings>(
+        2, _omitFieldNames ? '' : 'methodSettings', $pb.PbFieldType.PM,
+        subBuilder: MethodSettings.create)
     ..aOS(101, _omitFieldNames ? '' : 'newIssueUri')
     ..aOS(102, _omitFieldNames ? '' : 'documentationUri')
     ..aOS(103, _omitFieldNames ? '' : 'apiShortName')
@@ -192,6 +477,9 @@
             ClientLibraryOrganization.CLIENT_LIBRARY_ORGANIZATION_UNSPECIFIED,
         valueOf: ClientLibraryOrganization.valueOf,
         enumValues: ClientLibraryOrganization.values)
+    ..pc<ClientLibrarySettings>(
+        109, _omitFieldNames ? '' : 'librarySettings', $pb.PbFieldType.PM,
+        subBuilder: ClientLibrarySettings.create)
     ..aOS(110, _omitFieldNames ? '' : 'protoReferenceDocumentationUri')
     ..aOS(111, _omitFieldNames ? '' : 'restReferenceDocumentationUri')
     ..hasRequiredFields = false;
@@ -213,31 +501,36 @@
       $pb.GeneratedMessage.$_defaultFor<Publishing>(create);
   static Publishing? _defaultInstance;
 
+  /// A list of API method settings, e.g. the behavior for methods that use the
+  /// long-running operation pattern.
+  @$pb.TagNumber(2)
+  $pb.PbList<MethodSettings> get methodSettings => $_getList(0);
+
   /// Link to a *public* URI where users can report issues.  Example:
   /// https://issuetracker.google.com/issues/new?component=190865&template=1161103
   @$pb.TagNumber(101)
-  $core.String get newIssueUri => $_getSZ(0);
+  $core.String get newIssueUri => $_getSZ(1);
   @$pb.TagNumber(101)
   set newIssueUri($core.String v) {
-    $_setString(0, v);
+    $_setString(1, v);
   }
 
   @$pb.TagNumber(101)
-  $core.bool hasNewIssueUri() => $_has(0);
+  $core.bool hasNewIssueUri() => $_has(1);
   @$pb.TagNumber(101)
   void clearNewIssueUri() => $_clearField(101);
 
   /// Link to product home page.  Example:
   /// https://cloud.google.com/asset-inventory/docs/overview
   @$pb.TagNumber(102)
-  $core.String get documentationUri => $_getSZ(1);
+  $core.String get documentationUri => $_getSZ(2);
   @$pb.TagNumber(102)
   set documentationUri($core.String v) {
-    $_setString(1, v);
+    $_setString(2, v);
   }
 
   @$pb.TagNumber(102)
-  $core.bool hasDocumentationUri() => $_has(1);
+  $core.bool hasDocumentationUri() => $_has(2);
   @$pb.TagNumber(102)
   void clearDocumentationUri() => $_clearField(102);
 
@@ -245,87 +538,93 @@
   /// relations artifacts like docs, packages delivered to package managers,
   /// etc.  Example: "speech".
   @$pb.TagNumber(103)
-  $core.String get apiShortName => $_getSZ(2);
+  $core.String get apiShortName => $_getSZ(3);
   @$pb.TagNumber(103)
   set apiShortName($core.String v) {
-    $_setString(2, v);
+    $_setString(3, v);
   }
 
   @$pb.TagNumber(103)
-  $core.bool hasApiShortName() => $_has(2);
+  $core.bool hasApiShortName() => $_has(3);
   @$pb.TagNumber(103)
   void clearApiShortName() => $_clearField(103);
 
   /// GitHub label to apply to issues and pull requests opened for this API.
   @$pb.TagNumber(104)
-  $core.String get githubLabel => $_getSZ(3);
+  $core.String get githubLabel => $_getSZ(4);
   @$pb.TagNumber(104)
   set githubLabel($core.String v) {
-    $_setString(3, v);
+    $_setString(4, v);
   }
 
   @$pb.TagNumber(104)
-  $core.bool hasGithubLabel() => $_has(3);
+  $core.bool hasGithubLabel() => $_has(4);
   @$pb.TagNumber(104)
   void clearGithubLabel() => $_clearField(104);
 
   /// GitHub teams to be added to CODEOWNERS in the directory in GitHub
   /// containing source code for the client libraries for this API.
   @$pb.TagNumber(105)
-  $pb.PbList<$core.String> get codeownerGithubTeams => $_getList(4);
+  $pb.PbList<$core.String> get codeownerGithubTeams => $_getList(5);
 
   /// A prefix used in sample code when demarking regions to be included in
   /// documentation.
   @$pb.TagNumber(106)
-  $core.String get docTagPrefix => $_getSZ(5);
+  $core.String get docTagPrefix => $_getSZ(6);
   @$pb.TagNumber(106)
   set docTagPrefix($core.String v) {
-    $_setString(5, v);
+    $_setString(6, v);
   }
 
   @$pb.TagNumber(106)
-  $core.bool hasDocTagPrefix() => $_has(5);
+  $core.bool hasDocTagPrefix() => $_has(6);
   @$pb.TagNumber(106)
   void clearDocTagPrefix() => $_clearField(106);
 
   /// For whom the client library is being published.
   @$pb.TagNumber(107)
-  ClientLibraryOrganization get organization => $_getN(6);
+  ClientLibraryOrganization get organization => $_getN(7);
   @$pb.TagNumber(107)
   set organization(ClientLibraryOrganization v) {
     $_setField(107, v);
   }
 
   @$pb.TagNumber(107)
-  $core.bool hasOrganization() => $_has(6);
+  $core.bool hasOrganization() => $_has(7);
   @$pb.TagNumber(107)
   void clearOrganization() => $_clearField(107);
 
+  /// Client library settings.  If the same version string appears multiple
+  /// times in this list, then the last one wins.  Settings from earlier
+  /// settings with the same version string are discarded.
+  @$pb.TagNumber(109)
+  $pb.PbList<ClientLibrarySettings> get librarySettings => $_getList(8);
+
   /// Optional link to proto reference documentation.  Example:
   /// https://cloud.google.com/pubsub/lite/docs/reference/rpc
   @$pb.TagNumber(110)
-  $core.String get protoReferenceDocumentationUri => $_getSZ(7);
+  $core.String get protoReferenceDocumentationUri => $_getSZ(9);
   @$pb.TagNumber(110)
   set protoReferenceDocumentationUri($core.String v) {
-    $_setString(7, v);
+    $_setString(9, v);
   }
 
   @$pb.TagNumber(110)
-  $core.bool hasProtoReferenceDocumentationUri() => $_has(7);
+  $core.bool hasProtoReferenceDocumentationUri() => $_has(9);
   @$pb.TagNumber(110)
   void clearProtoReferenceDocumentationUri() => $_clearField(110);
 
   /// Optional link to REST reference documentation.  Example:
   /// https://cloud.google.com/pubsub/lite/docs/reference/rest
   @$pb.TagNumber(111)
-  $core.String get restReferenceDocumentationUri => $_getSZ(8);
+  $core.String get restReferenceDocumentationUri => $_getSZ(10);
   @$pb.TagNumber(111)
   set restReferenceDocumentationUri($core.String v) {
-    $_setString(8, v);
+    $_setString(10, v);
   }
 
   @$pb.TagNumber(111)
-  $core.bool hasRestReferenceDocumentationUri() => $_has(8);
+  $core.bool hasRestReferenceDocumentationUri() => $_has(10);
   @$pb.TagNumber(111)
   void clearRestReferenceDocumentationUri() => $_clearField(111);
 }
@@ -1103,6 +1402,261 @@
   $pb.PbMap<$core.String, $core.String> get renamedServices => $_getMap(1);
 }
 
+/// Describes settings to use when generating API methods that use the
+/// long-running operation pattern.
+/// All default values below are from those used in the client library
+/// generators (e.g.
+/// [Java](https://github.com/googleapis/gapic-generator-java/blob/04c2faa191a9b5a10b92392fe8482279c4404803/src/main/java/com/google/api/generator/gapic/composer/common/RetrySettingsComposer.java)).
+class MethodSettings_LongRunning extends $pb.GeneratedMessage {
+  factory MethodSettings_LongRunning({
+    $0.Duration? initialPollDelay,
+    $core.double? pollDelayMultiplier,
+    $0.Duration? maxPollDelay,
+    $0.Duration? totalPollTimeout,
+  }) {
+    final $result = create();
+    if (initialPollDelay != null) {
+      $result.initialPollDelay = initialPollDelay;
+    }
+    if (pollDelayMultiplier != null) {
+      $result.pollDelayMultiplier = pollDelayMultiplier;
+    }
+    if (maxPollDelay != null) {
+      $result.maxPollDelay = maxPollDelay;
+    }
+    if (totalPollTimeout != null) {
+      $result.totalPollTimeout = totalPollTimeout;
+    }
+    return $result;
+  }
+  MethodSettings_LongRunning._() : super();
+  factory MethodSettings_LongRunning.fromBuffer($core.List<$core.int> i,
+          [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromBuffer(i, r);
+  factory MethodSettings_LongRunning.fromJson($core.String i,
+          [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(
+      _omitMessageNames ? '' : 'MethodSettings.LongRunning',
+      package: const $pb.PackageName(_omitMessageNames ? '' : 'google.api'),
+      createEmptyInstance: create)
+    ..aOM<$0.Duration>(1, _omitFieldNames ? '' : 'initialPollDelay',
+        subBuilder: $0.Duration.create)
+    ..a<$core.double>(
+        2, _omitFieldNames ? '' : 'pollDelayMultiplier', $pb.PbFieldType.OF)
+    ..aOM<$0.Duration>(3, _omitFieldNames ? '' : 'maxPollDelay',
+        subBuilder: $0.Duration.create)
+    ..aOM<$0.Duration>(4, _omitFieldNames ? '' : 'totalPollTimeout',
+        subBuilder: $0.Duration.create)
+    ..hasRequiredFields = false;
+
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  MethodSettings_LongRunning clone() =>
+      MethodSettings_LongRunning()..mergeFromMessage(this);
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  MethodSettings_LongRunning copyWith(
+          void Function(MethodSettings_LongRunning) updates) =>
+      super.copyWith(
+              (message) => updates(message as MethodSettings_LongRunning))
+          as MethodSettings_LongRunning;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static MethodSettings_LongRunning create() => MethodSettings_LongRunning._();
+  MethodSettings_LongRunning createEmptyInstance() => create();
+  static $pb.PbList<MethodSettings_LongRunning> createRepeated() =>
+      $pb.PbList<MethodSettings_LongRunning>();
+  @$core.pragma('dart2js:noInline')
+  static MethodSettings_LongRunning getDefault() => _defaultInstance ??=
+      $pb.GeneratedMessage.$_defaultFor<MethodSettings_LongRunning>(create);
+  static MethodSettings_LongRunning? _defaultInstance;
+
+  /// Initial delay after which the first poll request will be made.
+  /// Default value: 5 seconds.
+  @$pb.TagNumber(1)
+  $0.Duration get initialPollDelay => $_getN(0);
+  @$pb.TagNumber(1)
+  set initialPollDelay($0.Duration v) {
+    $_setField(1, v);
+  }
+
+  @$pb.TagNumber(1)
+  $core.bool hasInitialPollDelay() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearInitialPollDelay() => $_clearField(1);
+  @$pb.TagNumber(1)
+  $0.Duration ensureInitialPollDelay() => $_ensure(0);
+
+  /// Multiplier to gradually increase delay between subsequent polls until it
+  /// reaches max_poll_delay.
+  /// Default value: 1.5.
+  @$pb.TagNumber(2)
+  $core.double get pollDelayMultiplier => $_getN(1);
+  @$pb.TagNumber(2)
+  set pollDelayMultiplier($core.double v) {
+    $_setFloat(1, v);
+  }
+
+  @$pb.TagNumber(2)
+  $core.bool hasPollDelayMultiplier() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearPollDelayMultiplier() => $_clearField(2);
+
+  /// Maximum time between two subsequent poll requests.
+  /// Default value: 45 seconds.
+  @$pb.TagNumber(3)
+  $0.Duration get maxPollDelay => $_getN(2);
+  @$pb.TagNumber(3)
+  set maxPollDelay($0.Duration v) {
+    $_setField(3, v);
+  }
+
+  @$pb.TagNumber(3)
+  $core.bool hasMaxPollDelay() => $_has(2);
+  @$pb.TagNumber(3)
+  void clearMaxPollDelay() => $_clearField(3);
+  @$pb.TagNumber(3)
+  $0.Duration ensureMaxPollDelay() => $_ensure(2);
+
+  /// Total polling timeout.
+  /// Default value: 5 minutes.
+  @$pb.TagNumber(4)
+  $0.Duration get totalPollTimeout => $_getN(3);
+  @$pb.TagNumber(4)
+  set totalPollTimeout($0.Duration v) {
+    $_setField(4, v);
+  }
+
+  @$pb.TagNumber(4)
+  $core.bool hasTotalPollTimeout() => $_has(3);
+  @$pb.TagNumber(4)
+  void clearTotalPollTimeout() => $_clearField(4);
+  @$pb.TagNumber(4)
+  $0.Duration ensureTotalPollTimeout() => $_ensure(3);
+}
+
+/// Describes the generator configuration for a method.
+class MethodSettings extends $pb.GeneratedMessage {
+  factory MethodSettings({
+    $core.String? selector,
+    MethodSettings_LongRunning? longRunning,
+    $core.Iterable<$core.String>? autoPopulatedFields,
+  }) {
+    final $result = create();
+    if (selector != null) {
+      $result.selector = selector;
+    }
+    if (longRunning != null) {
+      $result.longRunning = longRunning;
+    }
+    if (autoPopulatedFields != null) {
+      $result.autoPopulatedFields.addAll(autoPopulatedFields);
+    }
+    return $result;
+  }
+  MethodSettings._() : super();
+  factory MethodSettings.fromBuffer($core.List<$core.int> i,
+          [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromBuffer(i, r);
+  factory MethodSettings.fromJson($core.String i,
+          [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(
+      _omitMessageNames ? '' : 'MethodSettings',
+      package: const $pb.PackageName(_omitMessageNames ? '' : 'google.api'),
+      createEmptyInstance: create)
+    ..aOS(1, _omitFieldNames ? '' : 'selector')
+    ..aOM<MethodSettings_LongRunning>(2, _omitFieldNames ? '' : 'longRunning',
+        subBuilder: MethodSettings_LongRunning.create)
+    ..pPS(3, _omitFieldNames ? '' : 'autoPopulatedFields')
+    ..hasRequiredFields = false;
+
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  MethodSettings clone() => MethodSettings()..mergeFromMessage(this);
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  MethodSettings copyWith(void Function(MethodSettings) updates) =>
+      super.copyWith((message) => updates(message as MethodSettings))
+          as MethodSettings;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static MethodSettings create() => MethodSettings._();
+  MethodSettings createEmptyInstance() => create();
+  static $pb.PbList<MethodSettings> createRepeated() =>
+      $pb.PbList<MethodSettings>();
+  @$core.pragma('dart2js:noInline')
+  static MethodSettings getDefault() => _defaultInstance ??=
+      $pb.GeneratedMessage.$_defaultFor<MethodSettings>(create);
+  static MethodSettings? _defaultInstance;
+
+  /// The fully qualified name of the method, for which the options below apply.
+  /// This is used to find the method to apply the options.
+  ///
+  /// Example:
+  ///
+  ///    publishing:
+  ///      method_settings:
+  ///      - selector: google.storage.control.v2.StorageControl.CreateFolder
+  ///        # method settings for CreateFolder...
+  @$pb.TagNumber(1)
+  $core.String get selector => $_getSZ(0);
+  @$pb.TagNumber(1)
+  set selector($core.String v) {
+    $_setString(0, v);
+  }
+
+  @$pb.TagNumber(1)
+  $core.bool hasSelector() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearSelector() => $_clearField(1);
+
+  /// Describes settings to use for long-running operations when generating
+  /// API methods for RPCs. Complements RPCs that use the annotations in
+  /// google/longrunning/operations.proto.
+  ///
+  /// Example of a YAML configuration::
+  ///
+  ///    publishing:
+  ///      method_settings:
+  ///      - selector: google.cloud.speech.v2.Speech.BatchRecognize
+  ///        long_running:
+  ///          initial_poll_delay: 60s # 1 minute
+  ///          poll_delay_multiplier: 1.5
+  ///          max_poll_delay: 360s # 6 minutes
+  ///          total_poll_timeout: 54000s # 90 minutes
+  @$pb.TagNumber(2)
+  MethodSettings_LongRunning get longRunning => $_getN(1);
+  @$pb.TagNumber(2)
+  set longRunning(MethodSettings_LongRunning v) {
+    $_setField(2, v);
+  }
+
+  @$pb.TagNumber(2)
+  $core.bool hasLongRunning() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearLongRunning() => $_clearField(2);
+  @$pb.TagNumber(2)
+  MethodSettings_LongRunning ensureLongRunning() => $_ensure(1);
+
+  /// List of top-level fields of the request message, that should be
+  /// automatically populated by the client libraries based on their
+  /// (google.api.field_info).format. Currently supported format: UUID4.
+  ///
+  /// Example of a YAML configuration:
+  ///
+  ///    publishing:
+  ///      method_settings:
+  ///      - selector: google.example.v1.ExampleService.CreateExample
+  ///        auto_populated_fields:
+  ///        - request_id
+  @$pb.TagNumber(3)
+  $pb.PbList<$core.String> get autoPopulatedFields => $_getList(2);
+}
+
 /// This message is used to configure the generation of a subset of the RPCs in
 /// a service for client libraries.
 class SelectiveGapicGeneration extends $pb.GeneratedMessage {
diff --git a/protoc_plugin/lib/src/generated/client.pbenum.dart b/protoc_plugin/lib/src/gen/google/api/client.pbenum.dart
similarity index 98%
rename from protoc_plugin/lib/src/generated/client.pbenum.dart
rename to protoc_plugin/lib/src/gen/google/api/client.pbenum.dart
index bc568da..97f4568 100644
--- a/protoc_plugin/lib/src/generated/client.pbenum.dart
+++ b/protoc_plugin/lib/src/gen/google/api/client.pbenum.dart
@@ -1,6 +1,6 @@
 //
 //  Generated code. Do not modify.
-//  source: client.proto
+//  source: google/api/client.proto
 //
 // @dart = 3.3
 
diff --git a/protoc_plugin/lib/src/gen/google/api/http.pb.dart b/protoc_plugin/lib/src/gen/google/api/http.pb.dart
new file mode 100644
index 0000000..ca989fa
--- /dev/null
+++ b/protoc_plugin/lib/src/gen/google/api/http.pb.dart
@@ -0,0 +1,685 @@
+//
+//  Generated code. Do not modify.
+//  source: google/api/http.proto
+//
+// @dart = 3.3
+
+// ignore_for_file: annotate_overrides, camel_case_types, comment_references
+// ignore_for_file: constant_identifier_names, library_prefixes
+// ignore_for_file: non_constant_identifier_names, prefer_final_fields
+// ignore_for_file: unnecessary_import, unnecessary_this, unused_import
+
+import 'dart:core' as $core;
+
+import 'package:protobuf/protobuf.dart' as $pb;
+
+export 'package:protobuf/protobuf.dart' show GeneratedMessageGenericExtensions;
+
+/// Defines the HTTP configuration for an API service. It contains a list of
+/// [HttpRule][google.api.HttpRule], each specifying the mapping of an RPC method
+/// to one or more HTTP REST API methods.
+class Http extends $pb.GeneratedMessage {
+  factory Http({
+    $core.Iterable<HttpRule>? rules,
+    $core.bool? fullyDecodeReservedExpansion,
+  }) {
+    final $result = create();
+    if (rules != null) {
+      $result.rules.addAll(rules);
+    }
+    if (fullyDecodeReservedExpansion != null) {
+      $result.fullyDecodeReservedExpansion = fullyDecodeReservedExpansion;
+    }
+    return $result;
+  }
+  Http._() : super();
+  factory Http.fromBuffer($core.List<$core.int> i,
+          [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromBuffer(i, r);
+  factory Http.fromJson($core.String i,
+          [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(
+      _omitMessageNames ? '' : 'Http',
+      package: const $pb.PackageName(_omitMessageNames ? '' : 'google.api'),
+      createEmptyInstance: create)
+    ..pc<HttpRule>(1, _omitFieldNames ? '' : 'rules', $pb.PbFieldType.PM,
+        subBuilder: HttpRule.create)
+    ..aOB(2, _omitFieldNames ? '' : 'fullyDecodeReservedExpansion')
+    ..hasRequiredFields = false;
+
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  Http clone() => Http()..mergeFromMessage(this);
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  Http copyWith(void Function(Http) updates) =>
+      super.copyWith((message) => updates(message as Http)) as Http;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static Http create() => Http._();
+  Http createEmptyInstance() => create();
+  static $pb.PbList<Http> createRepeated() => $pb.PbList<Http>();
+  @$core.pragma('dart2js:noInline')
+  static Http getDefault() =>
+      _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<Http>(create);
+  static Http? _defaultInstance;
+
+  /// A list of HTTP configuration rules that apply to individual API methods.
+  ///
+  /// **NOTE:** All service configuration rules follow "last one wins" order.
+  @$pb.TagNumber(1)
+  $pb.PbList<HttpRule> get rules => $_getList(0);
+
+  /// When set to true, URL path parameters will be fully URI-decoded except in
+  /// cases of single segment matches in reserved expansion, where "%2F" will be
+  /// left encoded.
+  ///
+  /// The default behavior is to not decode RFC 6570 reserved characters in multi
+  /// segment matches.
+  @$pb.TagNumber(2)
+  $core.bool get fullyDecodeReservedExpansion => $_getBF(1);
+  @$pb.TagNumber(2)
+  set fullyDecodeReservedExpansion($core.bool v) {
+    $_setBool(1, v);
+  }
+
+  @$pb.TagNumber(2)
+  $core.bool hasFullyDecodeReservedExpansion() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearFullyDecodeReservedExpansion() => $_clearField(2);
+}
+
+enum HttpRule_Pattern { get, put, post, delete, patch, custom, notSet }
+
+/// gRPC Transcoding
+///
+/// gRPC Transcoding is a feature for mapping between a gRPC method and one or
+/// more HTTP REST endpoints. It allows developers to build a single API service
+/// that supports both gRPC APIs and REST APIs. Many systems, including [Google
+/// APIs](https://github.com/googleapis/googleapis),
+/// [Cloud Endpoints](https://cloud.google.com/endpoints), [gRPC
+/// Gateway](https://github.com/grpc-ecosystem/grpc-gateway),
+/// and [Envoy](https://github.com/envoyproxy/envoy) proxy support this feature
+/// and use it for large scale production services.
+///
+/// `HttpRule` defines the schema of the gRPC/REST mapping. The mapping specifies
+/// how different portions of the gRPC request message are mapped to the URL
+/// path, URL query parameters, and HTTP request body. It also controls how the
+/// gRPC response message is mapped to the HTTP response body. `HttpRule` is
+/// typically specified as an `google.api.http` annotation on the gRPC method.
+///
+/// Each mapping specifies a URL path template and an HTTP method. The path
+/// template may refer to one or more fields in the gRPC request message, as long
+/// as each field is a non-repeated field with a primitive (non-message) type.
+/// The path template controls how fields of the request message are mapped to
+/// the URL path.
+///
+/// Example:
+///
+///     service Messaging {
+///       rpc GetMessage(GetMessageRequest) returns (Message) {
+///         option (google.api.http) = {
+///             get: "/v1/{name=messages/*}"
+///         };
+///       }
+///     }
+///     message GetMessageRequest {
+///       string name = 1; // Mapped to URL path.
+///     }
+///     message Message {
+///       string text = 1; // The resource content.
+///     }
+///
+/// This enables an HTTP REST to gRPC mapping as below:
+///
+/// - HTTP: `GET /v1/messages/123456`
+/// - gRPC: `GetMessage(name: "messages/123456")`
+///
+/// Any fields in the request message which are not bound by the path template
+/// automatically become HTTP query parameters if there is no HTTP request body.
+/// For example:
+///
+///     service Messaging {
+///       rpc GetMessage(GetMessageRequest) returns (Message) {
+///         option (google.api.http) = {
+///             get:"/v1/messages/{message_id}"
+///         };
+///       }
+///     }
+///     message GetMessageRequest {
+///       message SubMessage {
+///         string subfield = 1;
+///       }
+///       string message_id = 1; // Mapped to URL path.
+///       int64 revision = 2;    // Mapped to URL query parameter `revision`.
+///       SubMessage sub = 3;    // Mapped to URL query parameter `sub.subfield`.
+///     }
+///
+/// This enables a HTTP JSON to RPC mapping as below:
+///
+/// - HTTP: `GET /v1/messages/123456?revision=2&sub.subfield=foo`
+/// - gRPC: `GetMessage(message_id: "123456" revision: 2 sub:
+/// SubMessage(subfield: "foo"))`
+///
+/// Note that fields which are mapped to URL query parameters must have a
+/// primitive type or a repeated primitive type or a non-repeated message type.
+/// In the case of a repeated type, the parameter can be repeated in the URL
+/// as `...?param=A&param=B`. In the case of a message type, each field of the
+/// message is mapped to a separate parameter, such as
+/// `...?foo.a=A&foo.b=B&foo.c=C`.
+///
+/// For HTTP methods that allow a request body, the `body` field
+/// specifies the mapping. Consider a REST update method on the
+/// message resource collection:
+///
+///     service Messaging {
+///       rpc UpdateMessage(UpdateMessageRequest) returns (Message) {
+///         option (google.api.http) = {
+///           patch: "/v1/messages/{message_id}"
+///           body: "message"
+///         };
+///       }
+///     }
+///     message UpdateMessageRequest {
+///       string message_id = 1; // mapped to the URL
+///       Message message = 2;   // mapped to the body
+///     }
+///
+/// The following HTTP JSON to RPC mapping is enabled, where the
+/// representation of the JSON in the request body is determined by
+/// protos JSON encoding:
+///
+/// - HTTP: `PATCH /v1/messages/123456 { "text": "Hi!" }`
+/// - gRPC: `UpdateMessage(message_id: "123456" message { text: "Hi!" })`
+///
+/// The special name `*` can be used in the body mapping to define that
+/// every field not bound by the path template should be mapped to the
+/// request body.  This enables the following alternative definition of
+/// the update method:
+///
+///     service Messaging {
+///       rpc UpdateMessage(Message) returns (Message) {
+///         option (google.api.http) = {
+///           patch: "/v1/messages/{message_id}"
+///           body: "*"
+///         };
+///       }
+///     }
+///     message Message {
+///       string message_id = 1;
+///       string text = 2;
+///     }
+///
+///
+/// The following HTTP JSON to RPC mapping is enabled:
+///
+/// - HTTP: `PATCH /v1/messages/123456 { "text": "Hi!" }`
+/// - gRPC: `UpdateMessage(message_id: "123456" text: "Hi!")`
+///
+/// Note that when using `*` in the body mapping, it is not possible to
+/// have HTTP parameters, as all fields not bound by the path end in
+/// the body. This makes this option more rarely used in practice when
+/// defining REST APIs. The common usage of `*` is in custom methods
+/// which don't use the URL at all for transferring data.
+///
+/// It is possible to define multiple HTTP methods for one RPC by using
+/// the `additional_bindings` option. Example:
+///
+///     service Messaging {
+///       rpc GetMessage(GetMessageRequest) returns (Message) {
+///         option (google.api.http) = {
+///           get: "/v1/messages/{message_id}"
+///           additional_bindings {
+///             get: "/v1/users/{user_id}/messages/{message_id}"
+///           }
+///         };
+///       }
+///     }
+///     message GetMessageRequest {
+///       string message_id = 1;
+///       string user_id = 2;
+///     }
+///
+/// This enables the following two alternative HTTP JSON to RPC mappings:
+///
+/// - HTTP: `GET /v1/messages/123456`
+/// - gRPC: `GetMessage(message_id: "123456")`
+///
+/// - HTTP: `GET /v1/users/me/messages/123456`
+/// - gRPC: `GetMessage(user_id: "me" message_id: "123456")`
+///
+/// Rules for HTTP mapping
+///
+/// 1. Leaf request fields (recursive expansion nested messages in the request
+///    message) are classified into three categories:
+///    - Fields referred by the path template. They are passed via the URL path.
+///    - Fields referred by the [HttpRule.body][google.api.HttpRule.body]. They
+///    are passed via the HTTP
+///      request body.
+///    - All other fields are passed via the URL query parameters, and the
+///      parameter name is the field path in the request message. A repeated
+///      field can be represented as multiple query parameters under the same
+///      name.
+///  2. If [HttpRule.body][google.api.HttpRule.body] is "*", there is no URL
+///  query parameter, all fields
+///     are passed via URL path and HTTP request body.
+///  3. If [HttpRule.body][google.api.HttpRule.body] is omitted, there is no HTTP
+///  request body, all
+///     fields are passed via URL path and URL query parameters.
+///
+/// Path template syntax
+///
+///     Template = "/" Segments [ Verb ] ;
+///     Segments = Segment { "/" Segment } ;
+///     Segment  = "*" | "**" | LITERAL | Variable ;
+///     Variable = "{" FieldPath [ "=" Segments ] "}" ;
+///     FieldPath = IDENT { "." IDENT } ;
+///     Verb     = ":" LITERAL ;
+///
+/// The syntax `*` matches a single URL path segment. The syntax `**` matches
+/// zero or more URL path segments, which must be the last part of the URL path
+/// except the `Verb`.
+///
+/// The syntax `Variable` matches part of the URL path as specified by its
+/// template. A variable template must not contain other variables. If a variable
+/// matches a single path segment, its template may be omitted, e.g. `{var}`
+/// is equivalent to `{var=*}`.
+///
+/// The syntax `LITERAL` matches literal text in the URL path. If the `LITERAL`
+/// contains any reserved character, such characters should be percent-encoded
+/// before the matching.
+///
+/// If a variable contains exactly one path segment, such as `"{var}"` or
+/// `"{var=*}"`, when such a variable is expanded into a URL path on the client
+/// side, all characters except `[-_.~0-9a-zA-Z]` are percent-encoded. The
+/// server side does the reverse decoding. Such variables show up in the
+/// [Discovery
+/// Document](https://developers.google.com/discovery/v1/reference/apis) as
+/// `{var}`.
+///
+/// If a variable contains multiple path segments, such as `"{var=foo/*}"`
+/// or `"{var=**}"`, when such a variable is expanded into a URL path on the
+/// client side, all characters except `[-_.~/0-9a-zA-Z]` are percent-encoded.
+/// The server side does the reverse decoding, except "%2F" and "%2f" are left
+/// unchanged. Such variables show up in the
+/// [Discovery
+/// Document](https://developers.google.com/discovery/v1/reference/apis) as
+/// `{+var}`.
+///
+/// Using gRPC API Service Configuration
+///
+/// gRPC API Service Configuration (service config) is a configuration language
+/// for configuring a gRPC service to become a user-facing product. The
+/// service config is simply the YAML representation of the `google.api.Service`
+/// proto message.
+///
+/// As an alternative to annotating your proto file, you can configure gRPC
+/// transcoding in your service config YAML files. You do this by specifying a
+/// `HttpRule` that maps the gRPC method to a REST endpoint, achieving the same
+/// effect as the proto annotation. This can be particularly useful if you
+/// have a proto that is reused in multiple services. Note that any transcoding
+/// specified in the service config will override any matching transcoding
+/// configuration in the proto.
+///
+/// The following example selects a gRPC method and applies an `HttpRule` to it:
+///
+///     http:
+///       rules:
+///         - selector: example.v1.Messaging.GetMessage
+///           get: /v1/messages/{message_id}/{sub.subfield}
+///
+/// Special notes
+///
+/// When gRPC Transcoding is used to map a gRPC to JSON REST endpoints, the
+/// proto to JSON conversion must follow the [proto3
+/// specification](https://developers.google.com/protocol-buffers/docs/proto3#json).
+///
+/// While the single segment variable follows the semantics of
+/// [RFC 6570](https://tools.ietf.org/html/rfc6570) Section 3.2.2 Simple String
+/// Expansion, the multi segment variable **does not** follow RFC 6570 Section
+/// 3.2.3 Reserved Expansion. The reason is that the Reserved Expansion
+/// does not expand special characters like `?` and `#`, which would lead
+/// to invalid URLs. As the result, gRPC Transcoding uses a custom encoding
+/// for multi segment variables.
+///
+/// The path variables **must not** refer to any repeated or mapped field,
+/// because client libraries are not capable of handling such variable expansion.
+///
+/// The path variables **must not** capture the leading "/" character. The reason
+/// is that the most common use case "{var}" does not capture the leading "/"
+/// character. For consistency, all path variables must share the same behavior.
+///
+/// Repeated message fields must not be mapped to URL query parameters, because
+/// no client library can support such complicated mapping.
+///
+/// If an API needs to use a JSON array for request or response body, it can map
+/// the request or response body to a repeated field. However, some gRPC
+/// Transcoding implementations may not support this feature.
+class HttpRule extends $pb.GeneratedMessage {
+  factory HttpRule({
+    $core.String? selector,
+    $core.String? get,
+    $core.String? put,
+    $core.String? post,
+    $core.String? delete,
+    $core.String? patch,
+    $core.String? body,
+    CustomHttpPattern? custom,
+    $core.Iterable<HttpRule>? additionalBindings,
+    $core.String? responseBody,
+  }) {
+    final $result = create();
+    if (selector != null) {
+      $result.selector = selector;
+    }
+    if (get != null) {
+      $result.get = get;
+    }
+    if (put != null) {
+      $result.put = put;
+    }
+    if (post != null) {
+      $result.post = post;
+    }
+    if (delete != null) {
+      $result.delete = delete;
+    }
+    if (patch != null) {
+      $result.patch = patch;
+    }
+    if (body != null) {
+      $result.body = body;
+    }
+    if (custom != null) {
+      $result.custom = custom;
+    }
+    if (additionalBindings != null) {
+      $result.additionalBindings.addAll(additionalBindings);
+    }
+    if (responseBody != null) {
+      $result.responseBody = responseBody;
+    }
+    return $result;
+  }
+  HttpRule._() : super();
+  factory HttpRule.fromBuffer($core.List<$core.int> i,
+          [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromBuffer(i, r);
+  factory HttpRule.fromJson($core.String i,
+          [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromJson(i, r);
+
+  static const $core.Map<$core.int, HttpRule_Pattern> _HttpRule_PatternByTag = {
+    2: HttpRule_Pattern.get,
+    3: HttpRule_Pattern.put,
+    4: HttpRule_Pattern.post,
+    5: HttpRule_Pattern.delete,
+    6: HttpRule_Pattern.patch,
+    8: HttpRule_Pattern.custom,
+    0: HttpRule_Pattern.notSet
+  };
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(
+      _omitMessageNames ? '' : 'HttpRule',
+      package: const $pb.PackageName(_omitMessageNames ? '' : 'google.api'),
+      createEmptyInstance: create)
+    ..oo(0, [2, 3, 4, 5, 6, 8])
+    ..aOS(1, _omitFieldNames ? '' : 'selector')
+    ..aOS(2, _omitFieldNames ? '' : 'get')
+    ..aOS(3, _omitFieldNames ? '' : 'put')
+    ..aOS(4, _omitFieldNames ? '' : 'post')
+    ..aOS(5, _omitFieldNames ? '' : 'delete')
+    ..aOS(6, _omitFieldNames ? '' : 'patch')
+    ..aOS(7, _omitFieldNames ? '' : 'body')
+    ..aOM<CustomHttpPattern>(8, _omitFieldNames ? '' : 'custom',
+        subBuilder: CustomHttpPattern.create)
+    ..pc<HttpRule>(
+        11, _omitFieldNames ? '' : 'additionalBindings', $pb.PbFieldType.PM,
+        subBuilder: HttpRule.create)
+    ..aOS(12, _omitFieldNames ? '' : 'responseBody')
+    ..hasRequiredFields = false;
+
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  HttpRule clone() => HttpRule()..mergeFromMessage(this);
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  HttpRule copyWith(void Function(HttpRule) updates) =>
+      super.copyWith((message) => updates(message as HttpRule)) as HttpRule;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static HttpRule create() => HttpRule._();
+  HttpRule createEmptyInstance() => create();
+  static $pb.PbList<HttpRule> createRepeated() => $pb.PbList<HttpRule>();
+  @$core.pragma('dart2js:noInline')
+  static HttpRule getDefault() =>
+      _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<HttpRule>(create);
+  static HttpRule? _defaultInstance;
+
+  HttpRule_Pattern whichPattern() => _HttpRule_PatternByTag[$_whichOneof(0)]!;
+  void clearPattern() => $_clearField($_whichOneof(0));
+
+  /// Selects a method to which this rule applies.
+  ///
+  /// Refer to [selector][google.api.DocumentationRule.selector] for syntax
+  /// details.
+  @$pb.TagNumber(1)
+  $core.String get selector => $_getSZ(0);
+  @$pb.TagNumber(1)
+  set selector($core.String v) {
+    $_setString(0, v);
+  }
+
+  @$pb.TagNumber(1)
+  $core.bool hasSelector() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearSelector() => $_clearField(1);
+
+  /// Maps to HTTP GET. Used for listing and getting information about
+  /// resources.
+  @$pb.TagNumber(2)
+  $core.String get get => $_getSZ(1);
+  @$pb.TagNumber(2)
+  set get($core.String v) {
+    $_setString(1, v);
+  }
+
+  @$pb.TagNumber(2)
+  $core.bool hasGet() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearGet() => $_clearField(2);
+
+  /// Maps to HTTP PUT. Used for replacing a resource.
+  @$pb.TagNumber(3)
+  $core.String get put => $_getSZ(2);
+  @$pb.TagNumber(3)
+  set put($core.String v) {
+    $_setString(2, v);
+  }
+
+  @$pb.TagNumber(3)
+  $core.bool hasPut() => $_has(2);
+  @$pb.TagNumber(3)
+  void clearPut() => $_clearField(3);
+
+  /// Maps to HTTP POST. Used for creating a resource or performing an action.
+  @$pb.TagNumber(4)
+  $core.String get post => $_getSZ(3);
+  @$pb.TagNumber(4)
+  set post($core.String v) {
+    $_setString(3, v);
+  }
+
+  @$pb.TagNumber(4)
+  $core.bool hasPost() => $_has(3);
+  @$pb.TagNumber(4)
+  void clearPost() => $_clearField(4);
+
+  /// Maps to HTTP DELETE. Used for deleting a resource.
+  @$pb.TagNumber(5)
+  $core.String get delete => $_getSZ(4);
+  @$pb.TagNumber(5)
+  set delete($core.String v) {
+    $_setString(4, v);
+  }
+
+  @$pb.TagNumber(5)
+  $core.bool hasDelete() => $_has(4);
+  @$pb.TagNumber(5)
+  void clearDelete() => $_clearField(5);
+
+  /// Maps to HTTP PATCH. Used for updating a resource.
+  @$pb.TagNumber(6)
+  $core.String get patch => $_getSZ(5);
+  @$pb.TagNumber(6)
+  set patch($core.String v) {
+    $_setString(5, v);
+  }
+
+  @$pb.TagNumber(6)
+  $core.bool hasPatch() => $_has(5);
+  @$pb.TagNumber(6)
+  void clearPatch() => $_clearField(6);
+
+  /// The name of the request field whose value is mapped to the HTTP request
+  /// body, or `*` for mapping all request fields not captured by the path
+  /// pattern to the HTTP body, or omitted for not having any HTTP request body.
+  ///
+  /// NOTE: the referred field must be present at the top-level of the request
+  /// message type.
+  @$pb.TagNumber(7)
+  $core.String get body => $_getSZ(6);
+  @$pb.TagNumber(7)
+  set body($core.String v) {
+    $_setString(6, v);
+  }
+
+  @$pb.TagNumber(7)
+  $core.bool hasBody() => $_has(6);
+  @$pb.TagNumber(7)
+  void clearBody() => $_clearField(7);
+
+  /// The custom pattern is used for specifying an HTTP method that is not
+  /// included in the `pattern` field, such as HEAD, or "*" to leave the
+  /// HTTP method unspecified for this rule. The wild-card rule is useful
+  /// for services that provide content to Web (HTML) clients.
+  @$pb.TagNumber(8)
+  CustomHttpPattern get custom => $_getN(7);
+  @$pb.TagNumber(8)
+  set custom(CustomHttpPattern v) {
+    $_setField(8, v);
+  }
+
+  @$pb.TagNumber(8)
+  $core.bool hasCustom() => $_has(7);
+  @$pb.TagNumber(8)
+  void clearCustom() => $_clearField(8);
+  @$pb.TagNumber(8)
+  CustomHttpPattern ensureCustom() => $_ensure(7);
+
+  /// Additional HTTP bindings for the selector. Nested bindings must
+  /// not contain an `additional_bindings` field themselves (that is,
+  /// the nesting may only be one level deep).
+  @$pb.TagNumber(11)
+  $pb.PbList<HttpRule> get additionalBindings => $_getList(8);
+
+  /// Optional. The name of the response field whose value is mapped to the HTTP
+  /// response body. When omitted, the entire response message will be used
+  /// as the HTTP response body.
+  ///
+  /// NOTE: The referred field must be present at the top-level of the response
+  /// message type.
+  @$pb.TagNumber(12)
+  $core.String get responseBody => $_getSZ(9);
+  @$pb.TagNumber(12)
+  set responseBody($core.String v) {
+    $_setString(9, v);
+  }
+
+  @$pb.TagNumber(12)
+  $core.bool hasResponseBody() => $_has(9);
+  @$pb.TagNumber(12)
+  void clearResponseBody() => $_clearField(12);
+}
+
+/// A custom pattern is used for defining custom HTTP verb.
+class CustomHttpPattern extends $pb.GeneratedMessage {
+  factory CustomHttpPattern({
+    $core.String? kind,
+    $core.String? path,
+  }) {
+    final $result = create();
+    if (kind != null) {
+      $result.kind = kind;
+    }
+    if (path != null) {
+      $result.path = path;
+    }
+    return $result;
+  }
+  CustomHttpPattern._() : super();
+  factory CustomHttpPattern.fromBuffer($core.List<$core.int> i,
+          [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromBuffer(i, r);
+  factory CustomHttpPattern.fromJson($core.String i,
+          [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(
+      _omitMessageNames ? '' : 'CustomHttpPattern',
+      package: const $pb.PackageName(_omitMessageNames ? '' : 'google.api'),
+      createEmptyInstance: create)
+    ..aOS(1, _omitFieldNames ? '' : 'kind')
+    ..aOS(2, _omitFieldNames ? '' : 'path')
+    ..hasRequiredFields = false;
+
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  CustomHttpPattern clone() => CustomHttpPattern()..mergeFromMessage(this);
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  CustomHttpPattern copyWith(void Function(CustomHttpPattern) updates) =>
+      super.copyWith((message) => updates(message as CustomHttpPattern))
+          as CustomHttpPattern;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static CustomHttpPattern create() => CustomHttpPattern._();
+  CustomHttpPattern createEmptyInstance() => create();
+  static $pb.PbList<CustomHttpPattern> createRepeated() =>
+      $pb.PbList<CustomHttpPattern>();
+  @$core.pragma('dart2js:noInline')
+  static CustomHttpPattern getDefault() => _defaultInstance ??=
+      $pb.GeneratedMessage.$_defaultFor<CustomHttpPattern>(create);
+  static CustomHttpPattern? _defaultInstance;
+
+  /// The name of this custom HTTP verb.
+  @$pb.TagNumber(1)
+  $core.String get kind => $_getSZ(0);
+  @$pb.TagNumber(1)
+  set kind($core.String v) {
+    $_setString(0, v);
+  }
+
+  @$pb.TagNumber(1)
+  $core.bool hasKind() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearKind() => $_clearField(1);
+
+  /// The path matched by this custom verb.
+  @$pb.TagNumber(2)
+  $core.String get path => $_getSZ(1);
+  @$pb.TagNumber(2)
+  set path($core.String v) {
+    $_setString(1, v);
+  }
+
+  @$pb.TagNumber(2)
+  $core.bool hasPath() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearPath() => $_clearField(2);
+}
+
+const _omitFieldNames = $core.bool.fromEnvironment('protobuf.omit_field_names');
+const _omitMessageNames =
+    $core.bool.fromEnvironment('protobuf.omit_message_names');
diff --git a/protoc_plugin/lib/src/gen/google/api/http.pbenum.dart b/protoc_plugin/lib/src/gen/google/api/http.pbenum.dart
new file mode 100644
index 0000000..4824393
--- /dev/null
+++ b/protoc_plugin/lib/src/gen/google/api/http.pbenum.dart
@@ -0,0 +1,10 @@
+//
+//  Generated code. Do not modify.
+//  source: google/api/http.proto
+//
+// @dart = 3.3
+
+// ignore_for_file: annotate_overrides, camel_case_types, comment_references
+// ignore_for_file: constant_identifier_names, library_prefixes
+// ignore_for_file: non_constant_identifier_names, prefer_final_fields
+// ignore_for_file: unnecessary_import, unnecessary_this, unused_import
diff --git a/protoc_plugin/lib/src/gen/google/api/launch_stage.pb.dart b/protoc_plugin/lib/src/gen/google/api/launch_stage.pb.dart
new file mode 100644
index 0000000..4373372
--- /dev/null
+++ b/protoc_plugin/lib/src/gen/google/api/launch_stage.pb.dart
@@ -0,0 +1,16 @@
+//
+//  Generated code. Do not modify.
+//  source: google/api/launch_stage.proto
+//
+// @dart = 3.3
+
+// ignore_for_file: annotate_overrides, camel_case_types, comment_references
+// ignore_for_file: constant_identifier_names, library_prefixes
+// ignore_for_file: non_constant_identifier_names, prefer_final_fields
+// ignore_for_file: unnecessary_import, unnecessary_this, unused_import
+
+import 'dart:core' as $core;
+
+export 'package:protobuf/protobuf.dart' show GeneratedMessageGenericExtensions;
+
+export 'launch_stage.pbenum.dart';
diff --git a/protoc_plugin/lib/src/gen/google/api/launch_stage.pbenum.dart b/protoc_plugin/lib/src/gen/google/api/launch_stage.pbenum.dart
new file mode 100644
index 0000000..1cb6b62
--- /dev/null
+++ b/protoc_plugin/lib/src/gen/google/api/launch_stage.pbenum.dart
@@ -0,0 +1,90 @@
+//
+//  Generated code. Do not modify.
+//  source: google/api/launch_stage.proto
+//
+// @dart = 3.3
+
+// ignore_for_file: annotate_overrides, camel_case_types, comment_references
+// ignore_for_file: constant_identifier_names, library_prefixes
+// ignore_for_file: non_constant_identifier_names, prefer_final_fields
+// ignore_for_file: unnecessary_import, unnecessary_this, unused_import
+
+import 'dart:core' as $core;
+
+import 'package:protobuf/protobuf.dart' as $pb;
+
+/// The launch stage as defined by [Google Cloud Platform
+/// Launch Stages](https://cloud.google.com/terms/launch-stages).
+class LaunchStage extends $pb.ProtobufEnum {
+  /// Do not use this default value.
+  static const LaunchStage LAUNCH_STAGE_UNSPECIFIED =
+      LaunchStage._(0, _omitEnumNames ? '' : 'LAUNCH_STAGE_UNSPECIFIED');
+
+  /// The feature is not yet implemented. Users can not use it.
+  static const LaunchStage UNIMPLEMENTED =
+      LaunchStage._(6, _omitEnumNames ? '' : 'UNIMPLEMENTED');
+
+  /// Prelaunch features are hidden from users and are only visible internally.
+  static const LaunchStage PRELAUNCH =
+      LaunchStage._(7, _omitEnumNames ? '' : 'PRELAUNCH');
+
+  /// Early Access features are limited to a closed group of testers. To use
+  /// these features, you must sign up in advance and sign a Trusted Tester
+  /// agreement (which includes confidentiality provisions). These features may
+  /// be unstable, changed in backward-incompatible ways, and are not
+  /// guaranteed to be released.
+  static const LaunchStage EARLY_ACCESS =
+      LaunchStage._(1, _omitEnumNames ? '' : 'EARLY_ACCESS');
+
+  /// Alpha is a limited availability test for releases before they are cleared
+  /// for widespread use. By Alpha, all significant design issues are resolved
+  /// and we are in the process of verifying functionality. Alpha customers
+  /// need to apply for access, agree to applicable terms, and have their
+  /// projects allowlisted. Alpha releases don't have to be feature complete,
+  /// no SLAs are provided, and there are no technical support obligations, but
+  /// they will be far enough along that customers can actually use them in
+  /// test environments or for limited-use tests -- just like they would in
+  /// normal production cases.
+  static const LaunchStage ALPHA =
+      LaunchStage._(2, _omitEnumNames ? '' : 'ALPHA');
+
+  /// Beta is the point at which we are ready to open a release for any
+  /// customer to use. There are no SLA or technical support obligations in a
+  /// Beta release. Products will be complete from a feature perspective, but
+  /// may have some open outstanding issues. Beta releases are suitable for
+  /// limited production use cases.
+  static const LaunchStage BETA =
+      LaunchStage._(3, _omitEnumNames ? '' : 'BETA');
+
+  /// GA features are open to all developers and are considered stable and
+  /// fully qualified for production use.
+  static const LaunchStage GA = LaunchStage._(4, _omitEnumNames ? '' : 'GA');
+
+  /// Deprecated features are scheduled to be shut down and removed. For more
+  /// information, see the "Deprecation Policy" section of our [Terms of
+  /// Service](https://cloud.google.com/terms/)
+  /// and the [Google Cloud Platform Subject to the Deprecation
+  /// Policy](https://cloud.google.com/terms/deprecation) documentation.
+  static const LaunchStage DEPRECATED =
+      LaunchStage._(5, _omitEnumNames ? '' : 'DEPRECATED');
+
+  static const $core.List<LaunchStage> values = <LaunchStage>[
+    LAUNCH_STAGE_UNSPECIFIED,
+    UNIMPLEMENTED,
+    PRELAUNCH,
+    EARLY_ACCESS,
+    ALPHA,
+    BETA,
+    GA,
+    DEPRECATED,
+  ];
+
+  static final $core.List<LaunchStage?> _byValue =
+      $pb.ProtobufEnum.$_initByValueList(values, 7);
+  static LaunchStage? valueOf($core.int value) =>
+      value < 0 || value >= _byValue.length ? null : _byValue[value];
+
+  const LaunchStage._(super.v, super.n);
+}
+
+const _omitEnumNames = $core.bool.fromEnvironment('protobuf.omit_enum_names');
diff --git a/protoc_plugin/lib/src/generated/plugin.pb.dart b/protoc_plugin/lib/src/gen/google/protobuf/compiler/plugin.pb.dart
similarity index 96%
rename from protoc_plugin/lib/src/generated/plugin.pb.dart
rename to protoc_plugin/lib/src/gen/google/protobuf/compiler/plugin.pb.dart
index 2b23ada..07da1c3 100644
--- a/protoc_plugin/lib/src/generated/plugin.pb.dart
+++ b/protoc_plugin/lib/src/gen/google/protobuf/compiler/plugin.pb.dart
@@ -1,6 +1,6 @@
 //
 //  Generated code. Do not modify.
-//  source: plugin.proto
+//  source: google/protobuf/compiler/plugin.proto
 //
 // @dart = 3.3
 
@@ -14,7 +14,7 @@
 import 'package:fixnum/fixnum.dart' as $fixnum;
 import 'package:protobuf/protobuf.dart' as $pb;
 
-import 'descriptor.pb.dart' as $0;
+import '../descriptor.pb.dart' as $2;
 
 export 'package:protobuf/protobuf.dart' show GeneratedMessageGenericExtensions;
 
@@ -136,7 +136,7 @@
     $core.Iterable<$core.String>? fileToGenerate,
     $core.String? parameter,
     Version? compilerVersion,
-    $core.Iterable<$0.FileDescriptorProto>? protoFile,
+    $core.Iterable<$2.FileDescriptorProto>? protoFile,
   }) {
     final $result = create();
     if (fileToGenerate != null) {
@@ -170,9 +170,9 @@
     ..aOS(2, _omitFieldNames ? '' : 'parameter')
     ..aOM<Version>(3, _omitFieldNames ? '' : 'compilerVersion',
         subBuilder: Version.create)
-    ..pc<$0.FileDescriptorProto>(
+    ..pc<$2.FileDescriptorProto>(
         15, _omitFieldNames ? '' : 'protoFile', $pb.PbFieldType.PM,
-        subBuilder: $0.FileDescriptorProto.create);
+        subBuilder: $2.FileDescriptorProto.create);
 
   @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
   CodeGeneratorRequest clone() =>
@@ -243,7 +243,7 @@
   /// Type names of fields and extensions in the FileDescriptorProto are always
   /// fully qualified.
   @$pb.TagNumber(15)
-  $pb.PbList<$0.FileDescriptorProto> get protoFile => $_getList(3);
+  $pb.PbList<$2.FileDescriptorProto> get protoFile => $_getList(3);
 }
 
 /// Represents a single generated file.
@@ -252,7 +252,7 @@
     $core.String? name,
     $core.String? insertionPoint,
     $core.String? content,
-    $0.GeneratedCodeInfo? generatedCodeInfo,
+    $2.GeneratedCodeInfo? generatedCodeInfo,
   }) {
     final $result = create();
     if (name != null) {
@@ -285,8 +285,8 @@
     ..aOS(1, _omitFieldNames ? '' : 'name')
     ..aOS(2, _omitFieldNames ? '' : 'insertionPoint')
     ..aOS(15, _omitFieldNames ? '' : 'content')
-    ..aOM<$0.GeneratedCodeInfo>(16, _omitFieldNames ? '' : 'generatedCodeInfo',
-        subBuilder: $0.GeneratedCodeInfo.create)
+    ..aOM<$2.GeneratedCodeInfo>(16, _omitFieldNames ? '' : 'generatedCodeInfo',
+        subBuilder: $2.GeneratedCodeInfo.create)
     ..hasRequiredFields = false;
 
   @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
@@ -400,9 +400,9 @@
   /// point is used, this information will be appropriately offset and inserted
   /// into the code generation metadata for the generated files.
   @$pb.TagNumber(16)
-  $0.GeneratedCodeInfo get generatedCodeInfo => $_getN(3);
+  $2.GeneratedCodeInfo get generatedCodeInfo => $_getN(3);
   @$pb.TagNumber(16)
-  set generatedCodeInfo($0.GeneratedCodeInfo v) {
+  set generatedCodeInfo($2.GeneratedCodeInfo v) {
     $_setField(16, v);
   }
 
@@ -411,7 +411,7 @@
   @$pb.TagNumber(16)
   void clearGeneratedCodeInfo() => $_clearField(16);
   @$pb.TagNumber(16)
-  $0.GeneratedCodeInfo ensureGeneratedCodeInfo() => $_ensure(3);
+  $2.GeneratedCodeInfo ensureGeneratedCodeInfo() => $_ensure(3);
 }
 
 /// The plugin writes an encoded CodeGeneratorResponse to stdout.
diff --git a/protoc_plugin/lib/src/generated/plugin.pbenum.dart b/protoc_plugin/lib/src/gen/google/protobuf/compiler/plugin.pbenum.dart
similarity index 96%
rename from protoc_plugin/lib/src/generated/plugin.pbenum.dart
rename to protoc_plugin/lib/src/gen/google/protobuf/compiler/plugin.pbenum.dart
index 2f427c9..c4ef32e 100644
--- a/protoc_plugin/lib/src/generated/plugin.pbenum.dart
+++ b/protoc_plugin/lib/src/gen/google/protobuf/compiler/plugin.pbenum.dart
@@ -1,6 +1,6 @@
 //
 //  Generated code. Do not modify.
-//  source: plugin.proto
+//  source: google/protobuf/compiler/plugin.proto
 //
 // @dart = 3.3
 
diff --git a/protoc_plugin/lib/src/generated/descriptor.pb.dart b/protoc_plugin/lib/src/gen/google/protobuf/descriptor.pb.dart
similarity index 99%
rename from protoc_plugin/lib/src/generated/descriptor.pb.dart
rename to protoc_plugin/lib/src/gen/google/protobuf/descriptor.pb.dart
index 316c81a..45f178a 100644
--- a/protoc_plugin/lib/src/generated/descriptor.pb.dart
+++ b/protoc_plugin/lib/src/gen/google/protobuf/descriptor.pb.dart
@@ -1,6 +1,6 @@
 //
 //  Generated code. Do not modify.
-//  source: descriptor.proto
+//  source: google/protobuf/descriptor.proto
 //
 // @dart = 3.3
 
diff --git a/protoc_plugin/lib/src/generated/descriptor.pbenum.dart b/protoc_plugin/lib/src/gen/google/protobuf/descriptor.pbenum.dart
similarity index 99%
rename from protoc_plugin/lib/src/generated/descriptor.pbenum.dart
rename to protoc_plugin/lib/src/gen/google/protobuf/descriptor.pbenum.dart
index 15909ed..f7ca7b8 100644
--- a/protoc_plugin/lib/src/generated/descriptor.pbenum.dart
+++ b/protoc_plugin/lib/src/gen/google/protobuf/descriptor.pbenum.dart
@@ -1,6 +1,6 @@
 //
 //  Generated code. Do not modify.
-//  source: descriptor.proto
+//  source: google/protobuf/descriptor.proto
 //
 // @dart = 3.3
 
diff --git a/protoc_plugin/lib/src/gen/google/protobuf/duration.pb.dart b/protoc_plugin/lib/src/gen/google/protobuf/duration.pb.dart
new file mode 100644
index 0000000..5f8439b
--- /dev/null
+++ b/protoc_plugin/lib/src/gen/google/protobuf/duration.pb.dart
@@ -0,0 +1,180 @@
+//
+//  Generated code. Do not modify.
+//  source: google/protobuf/duration.proto
+//
+// @dart = 3.3
+
+// ignore_for_file: annotate_overrides, camel_case_types, comment_references
+// ignore_for_file: constant_identifier_names, implementation_imports
+// ignore_for_file: library_prefixes, non_constant_identifier_names
+// ignore_for_file: prefer_final_fields, unnecessary_import, unnecessary_this
+// ignore_for_file: unused_import
+
+import 'dart:core' as $core;
+
+import 'package:fixnum/fixnum.dart' as $fixnum;
+import 'package:protobuf/protobuf.dart' as $pb;
+import 'package:protobuf/src/protobuf/mixins/well_known.dart' as $mixin;
+
+export 'package:protobuf/protobuf.dart' show GeneratedMessageGenericExtensions;
+
+/// A Duration represents a signed, fixed-length span of time represented
+/// as a count of seconds and fractions of seconds at nanosecond
+/// resolution. It is independent of any calendar and concepts like "day"
+/// or "month". It is related to Timestamp in that the difference between
+/// two Timestamp values is a Duration and it can be added or subtracted
+/// from a Timestamp. Range is approximately +-10,000 years.
+///
+/// # Examples
+///
+/// Example 1: Compute Duration from two Timestamps in pseudo code.
+///
+///     Timestamp start = ...;
+///     Timestamp end = ...;
+///     Duration duration = ...;
+///
+///     duration.seconds = end.seconds - start.seconds;
+///     duration.nanos = end.nanos - start.nanos;
+///
+///     if (duration.seconds < 0 && duration.nanos > 0) {
+///       duration.seconds += 1;
+///       duration.nanos -= 1000000000;
+///     } else if (duration.seconds > 0 && duration.nanos < 0) {
+///       duration.seconds -= 1;
+///       duration.nanos += 1000000000;
+///     }
+///
+/// Example 2: Compute Timestamp from Timestamp + Duration in pseudo code.
+///
+///     Timestamp start = ...;
+///     Duration duration = ...;
+///     Timestamp end = ...;
+///
+///     end.seconds = start.seconds + duration.seconds;
+///     end.nanos = start.nanos + duration.nanos;
+///
+///     if (end.nanos < 0) {
+///       end.seconds -= 1;
+///       end.nanos += 1000000000;
+///     } else if (end.nanos >= 1000000000) {
+///       end.seconds += 1;
+///       end.nanos -= 1000000000;
+///     }
+///
+/// Example 3: Compute Duration from datetime.timedelta in Python.
+///
+///     td = datetime.timedelta(days=3, minutes=10)
+///     duration = Duration()
+///     duration.FromTimedelta(td)
+///
+/// # JSON Mapping
+///
+/// In JSON format, the Duration type is encoded as a string rather than an
+/// object, where the string ends in the suffix "s" (indicating seconds) and
+/// is preceded by the number of seconds, with nanoseconds expressed as
+/// fractional seconds. For example, 3 seconds with 0 nanoseconds should be
+/// encoded in JSON format as "3s", while 3 seconds and 1 nanosecond should
+/// be expressed in JSON format as "3.000000001s", and 3 seconds and 1
+/// microsecond should be expressed in JSON format as "3.000001s".
+class Duration extends $pb.GeneratedMessage with $mixin.DurationMixin {
+  factory Duration({
+    $fixnum.Int64? seconds,
+    $core.int? nanos,
+  }) {
+    final $result = create();
+    if (seconds != null) {
+      $result.seconds = seconds;
+    }
+    if (nanos != null) {
+      $result.nanos = nanos;
+    }
+    return $result;
+  }
+  Duration._() : super();
+  factory Duration.fromBuffer($core.List<$core.int> i,
+          [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromBuffer(i, r);
+  factory Duration.fromJson($core.String i,
+          [$pb.ExtensionRegistry r = $pb.ExtensionRegistry.EMPTY]) =>
+      create()..mergeFromJson(i, r);
+
+  static final $pb.BuilderInfo _i = $pb.BuilderInfo(
+      _omitMessageNames ? '' : 'Duration',
+      package:
+          const $pb.PackageName(_omitMessageNames ? '' : 'google.protobuf'),
+      createEmptyInstance: create,
+      toProto3Json: $mixin.DurationMixin.toProto3JsonHelper,
+      fromProto3Json: $mixin.DurationMixin.fromProto3JsonHelper)
+    ..aInt64(1, _omitFieldNames ? '' : 'seconds')
+    ..a<$core.int>(2, _omitFieldNames ? '' : 'nanos', $pb.PbFieldType.O3)
+    ..hasRequiredFields = false;
+
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  Duration clone() => Duration()..mergeFromMessage(this);
+  @$core.Deprecated('See https://github.com/google/protobuf.dart/issues/998.')
+  Duration copyWith(void Function(Duration) updates) =>
+      super.copyWith((message) => updates(message as Duration)) as Duration;
+
+  $pb.BuilderInfo get info_ => _i;
+
+  @$core.pragma('dart2js:noInline')
+  static Duration create() => Duration._();
+  Duration createEmptyInstance() => create();
+  static $pb.PbList<Duration> createRepeated() => $pb.PbList<Duration>();
+  @$core.pragma('dart2js:noInline')
+  static Duration getDefault() =>
+      _defaultInstance ??= $pb.GeneratedMessage.$_defaultFor<Duration>(create);
+  static Duration? _defaultInstance;
+
+  /// Signed seconds of the span of time. Must be from -315,576,000,000
+  /// to +315,576,000,000 inclusive. Note: these bounds are computed from:
+  /// 60 sec/min * 60 min/hr * 24 hr/day * 365.25 days/year * 10000 years
+  @$pb.TagNumber(1)
+  $fixnum.Int64 get seconds => $_getI64(0);
+  @$pb.TagNumber(1)
+  set seconds($fixnum.Int64 v) {
+    $_setInt64(0, v);
+  }
+
+  @$pb.TagNumber(1)
+  $core.bool hasSeconds() => $_has(0);
+  @$pb.TagNumber(1)
+  void clearSeconds() => $_clearField(1);
+
+  /// Signed fractions of a second at nanosecond resolution of the span
+  /// of time. Durations less than one second are represented with a 0
+  /// `seconds` field and a positive or negative `nanos` field. For durations
+  /// of one second or more, a non-zero value for the `nanos` field must be
+  /// of the same sign as the `seconds` field. Must be from -999,999,999
+  /// to +999,999,999 inclusive.
+  @$pb.TagNumber(2)
+  $core.int get nanos => $_getIZ(1);
+  @$pb.TagNumber(2)
+  set nanos($core.int v) {
+    $_setSignedInt32(1, v);
+  }
+
+  @$pb.TagNumber(2)
+  $core.bool hasNanos() => $_has(1);
+  @$pb.TagNumber(2)
+  void clearNanos() => $_clearField(2);
+
+  /// Converts the [Duration] to [$core.Duration].
+  ///
+  /// This is a lossy conversion, as [$core.Duration] is limited to [int]
+  /// microseconds and also does not support nanosecond precision.
+  $core.Duration toDart() => $core.Duration(
+        seconds: seconds.toInt(),
+        microseconds: nanos ~/ 1000,
+      );
+
+  /// Creates a new instance from [$core.Duration].
+  static Duration fromDart($core.Duration duration) => Duration()
+    ..seconds = $fixnum.Int64(duration.inSeconds)
+    ..nanos =
+        (duration.inMicroseconds % $core.Duration.microsecondsPerSecond) * 1000;
+}
+
+const _omitFieldNames = $core.bool.fromEnvironment('protobuf.omit_field_names');
+const _omitMessageNames =
+    $core.bool.fromEnvironment('protobuf.omit_message_names');
diff --git a/protoc_plugin/lib/src/gen/google/protobuf/duration.pbenum.dart b/protoc_plugin/lib/src/gen/google/protobuf/duration.pbenum.dart
new file mode 100644
index 0000000..431da01
--- /dev/null
+++ b/protoc_plugin/lib/src/gen/google/protobuf/duration.pbenum.dart
@@ -0,0 +1,10 @@
+//
+//  Generated code. Do not modify.
+//  source: google/protobuf/duration.proto
+//
+// @dart = 3.3
+
+// ignore_for_file: annotate_overrides, camel_case_types, comment_references
+// ignore_for_file: constant_identifier_names, library_prefixes
+// ignore_for_file: non_constant_identifier_names, prefer_final_fields
+// ignore_for_file: unnecessary_import, unnecessary_this, unused_import
diff --git a/protoc_plugin/lib/src/options.dart b/protoc_plugin/lib/src/options.dart
index 25b960b..a923373 100644
--- a/protoc_plugin/lib/src/options.dart
+++ b/protoc_plugin/lib/src/options.dart
@@ -2,7 +2,7 @@
 // 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 'generated/plugin.pb.dart';
+import 'gen/google/protobuf/compiler/plugin.pb.dart';
 
 typedef OnError = void Function(String details);
 
diff --git a/protoc_plugin/lib/src/shared.dart b/protoc_plugin/lib/src/shared.dart
index c2c729d..89fa1d1 100644
--- a/protoc_plugin/lib/src/shared.dart
+++ b/protoc_plugin/lib/src/shared.dart
@@ -6,7 +6,7 @@
 import 'dart:io';
 
 import '../protoc.dart';
-import '../src/generated/descriptor.pb.dart';
+import '../src/gen/google/protobuf/descriptor.pb.dart';
 
 const protobufImportPrefix = r'$pb';
 const asyncImportPrefix = r'$async';
diff --git a/protoc_plugin/protos/README.md b/protoc_plugin/protos/README.md
new file mode 100644
index 0000000..1b430fc
--- /dev/null
+++ b/protoc_plugin/protos/README.md
@@ -0,0 +1,29 @@
+## What's this?
+
+These are core protos that are used in the protoc_plugin generator. They allow
+us to read generation requests from the protoc tool as well as parse extensions
+from protos for things like gRPC generation parameter and other config
+information.
+
+## Regenerating
+
+To regenerate the Dart code from the current protos, run:
+
+```
+make update-pregenerated
+```
+
+This will generate the associated Dart code in `lib/src/gen/`.
+
+## Updating the protos
+
+The protos are currently updated by hand. We should create a shell script to
+update from the source repos at specific SHAs. In the meantime:
+
+The contents of `google/protobuf/` can be found at 
+https://github.com/protocolbuffers/protobuf/tree/main/src/google/protobuf.
+
+All other 'google' protos can be found at
+https://github.com/googleapis/googleapis/tree/master/google.
+
+`dart_options.proto` is hand-maintained.
diff --git a/protoc_plugin/protos/dart_options.proto b/protoc_plugin/protos/dart_options.proto
index 507c7f3..cdb49d4 100644
--- a/protoc_plugin/protos/dart_options.proto
+++ b/protoc_plugin/protos/dart_options.proto
@@ -3,12 +3,12 @@
 
 package dart_options;
 
-// This file must be modified for Google internal use,
-// because custom options only work when the package name
-// agrees with the version of protoc we are using.
-// (The import statement and "google.protobuf." prefix need to be changed.)
+// This file must be modified for Google internal use, because custom options
+// only work when the package name agrees with the version of protoc we are
+// using (the import statement and "google.protobuf." prefix need to be
+// changed).
 
-import "descriptor.proto";
+import "google/protobuf/descriptor.proto";
 
 // A mixin that can be used in the 'with' clause of the generated Dart class
 // for a proto message.
@@ -28,7 +28,6 @@
 
 // Defines additional Dart imports to be used with messages in this file.
 message Imports {
-
   // Mixins to be used on messages in this file.
   // These mixins are in addition to internally defined mixins (e.g PbMapMixin)
   // and may override them.
@@ -41,7 +40,6 @@
 }
 
 extend google.protobuf.FileOptions {
-
   optional Imports imports = 28125061;
 
   // Applies the named mixin to all messages in this file.
@@ -51,7 +49,6 @@
 }
 
 extend google.protobuf.MessageOptions {
-
   // Applies the named mixin.
   // For now, "PbMapMixin" is the only available mixin.
   // The empty string can be used to turn off mixins for this message.
diff --git a/protoc_plugin/protos/client.proto b/protoc_plugin/protos/google/api/client.proto
similarity index 75%
rename from protoc_plugin/protos/client.proto
rename to protoc_plugin/protos/google/api/client.proto
index 0991b2d..3d69256 100644
--- a/protoc_plugin/protos/client.proto
+++ b/protoc_plugin/protos/google/api/client.proto
@@ -16,7 +16,9 @@
 
 package google.api;
 
-import "descriptor.proto";
+import "google/api/launch_stage.proto";
+import "google/protobuf/descriptor.proto";
+import "google/protobuf/duration.proto";
 
 option go_package = "google.golang.org/genproto/googleapis/api/annotations;annotations";
 option java_multiple_files = true;
@@ -127,10 +129,53 @@
   SelectiveGapicGeneration selective_gapic_generation = 3;
 }
 
+// Details about how and where to publish client libraries.
+message ClientLibrarySettings {
+  // Version of the API to apply these settings to. This is the full protobuf
+  // package for the API, ending in the version element.
+  // Examples: "google.cloud.speech.v1" and "google.spanner.admin.database.v1".
+  string version = 1;
+
+  // Launch stage of this version of the API.
+  LaunchStage launch_stage = 2;
+
+  // When using transport=rest, the client request will encode enums as
+  // numbers rather than strings.
+  bool rest_numeric_enums = 3;
+
+  // Settings for legacy Java features, supported in the Service YAML.
+  JavaSettings java_settings = 21;
+
+  // Settings for C++ client libraries.
+  CppSettings cpp_settings = 22;
+
+  // Settings for PHP client libraries.
+  PhpSettings php_settings = 23;
+
+  // Settings for Python client libraries.
+  PythonSettings python_settings = 24;
+
+  // Settings for Node client libraries.
+  NodeSettings node_settings = 25;
+
+  // Settings for .NET client libraries.
+  DotnetSettings dotnet_settings = 26;
+
+  // Settings for Ruby client libraries.
+  RubySettings ruby_settings = 27;
+
+  // Settings for Go client libraries.
+  GoSettings go_settings = 28;
+}
+
 // This message configures the settings for publishing [Google Cloud Client
 // libraries](https://cloud.google.com/apis/docs/cloud-client-libraries)
 // generated from the service config.
 message Publishing {
+  // A list of API method settings, e.g. the behavior for methods that use the
+  // long-running operation pattern.
+  repeated MethodSettings method_settings = 2;
+
   // Link to a *public* URI where users can report issues.  Example:
   // https://issuetracker.google.com/issues/new?component=190865&template=1161103
   string new_issue_uri = 101;
@@ -158,6 +203,11 @@
   // For whom the client library is being published.
   ClientLibraryOrganization organization = 107;
 
+  // Client library settings.  If the same version string appears multiple
+  // times in this list, then the last one wins.  Settings from earlier
+  // settings with the same version string are discarded.
+  repeated ClientLibrarySettings library_settings = 109;
+
   // Optional link to proto reference documentation.  Example:
   // https://cloud.google.com/pubsub/lite/docs/reference/rpc
   string proto_reference_documentation_uri = 110;
@@ -310,6 +360,73 @@
   map<string, string> renamed_services = 2;
 }
 
+// Describes the generator configuration for a method.
+message MethodSettings {
+  // Describes settings to use when generating API methods that use the
+  // long-running operation pattern.
+  // All default values below are from those used in the client library
+  // generators (e.g.
+  // [Java](https://github.com/googleapis/gapic-generator-java/blob/04c2faa191a9b5a10b92392fe8482279c4404803/src/main/java/com/google/api/generator/gapic/composer/common/RetrySettingsComposer.java)).
+  message LongRunning {
+    // Initial delay after which the first poll request will be made.
+    // Default value: 5 seconds.
+    google.protobuf.Duration initial_poll_delay = 1;
+
+    // Multiplier to gradually increase delay between subsequent polls until it
+    // reaches max_poll_delay.
+    // Default value: 1.5.
+    float poll_delay_multiplier = 2;
+
+    // Maximum time between two subsequent poll requests.
+    // Default value: 45 seconds.
+    google.protobuf.Duration max_poll_delay = 3;
+
+    // Total polling timeout.
+    // Default value: 5 minutes.
+    google.protobuf.Duration total_poll_timeout = 4;
+  }
+
+  // The fully qualified name of the method, for which the options below apply.
+  // This is used to find the method to apply the options.
+  //
+  // Example:
+  //
+  //    publishing:
+  //      method_settings:
+  //      - selector: google.storage.control.v2.StorageControl.CreateFolder
+  //        # method settings for CreateFolder...
+  string selector = 1;
+
+  // Describes settings to use for long-running operations when generating
+  // API methods for RPCs. Complements RPCs that use the annotations in
+  // google/longrunning/operations.proto.
+  //
+  // Example of a YAML configuration::
+  //
+  //    publishing:
+  //      method_settings:
+  //      - selector: google.cloud.speech.v2.Speech.BatchRecognize
+  //        long_running:
+  //          initial_poll_delay: 60s # 1 minute
+  //          poll_delay_multiplier: 1.5
+  //          max_poll_delay: 360s # 6 minutes
+  //          total_poll_timeout: 54000s # 90 minutes
+  LongRunning long_running = 2;
+
+  // List of top-level fields of the request message, that should be
+  // automatically populated by the client libraries based on their
+  // (google.api.field_info).format. Currently supported format: UUID4.
+  //
+  // Example of a YAML configuration:
+  //
+  //    publishing:
+  //      method_settings:
+  //      - selector: google.example.v1.ExampleService.CreateExample
+  //        auto_populated_fields:
+  //        - request_id
+  repeated string auto_populated_fields = 3;
+}
+
 // The organization for which the client libraries are being published.
 // Affects the url where generated docs are published, etc.
 enum ClientLibraryOrganization {
diff --git a/protoc_plugin/protos/google/api/http.proto b/protoc_plugin/protos/google/api/http.proto
new file mode 100644
index 0000000..57621b5
--- /dev/null
+++ b/protoc_plugin/protos/google/api/http.proto
@@ -0,0 +1,370 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package google.api;
+
+option go_package = "google.golang.org/genproto/googleapis/api/annotations;annotations";
+option java_multiple_files = true;
+option java_outer_classname = "HttpProto";
+option java_package = "com.google.api";
+option objc_class_prefix = "GAPI";
+
+// Defines the HTTP configuration for an API service. It contains a list of
+// [HttpRule][google.api.HttpRule], each specifying the mapping of an RPC method
+// to one or more HTTP REST API methods.
+message Http {
+  // A list of HTTP configuration rules that apply to individual API methods.
+  //
+  // **NOTE:** All service configuration rules follow "last one wins" order.
+  repeated HttpRule rules = 1;
+
+  // When set to true, URL path parameters will be fully URI-decoded except in
+  // cases of single segment matches in reserved expansion, where "%2F" will be
+  // left encoded.
+  //
+  // The default behavior is to not decode RFC 6570 reserved characters in multi
+  // segment matches.
+  bool fully_decode_reserved_expansion = 2;
+}
+
+// gRPC Transcoding
+//
+// gRPC Transcoding is a feature for mapping between a gRPC method and one or
+// more HTTP REST endpoints. It allows developers to build a single API service
+// that supports both gRPC APIs and REST APIs. Many systems, including [Google
+// APIs](https://github.com/googleapis/googleapis),
+// [Cloud Endpoints](https://cloud.google.com/endpoints), [gRPC
+// Gateway](https://github.com/grpc-ecosystem/grpc-gateway),
+// and [Envoy](https://github.com/envoyproxy/envoy) proxy support this feature
+// and use it for large scale production services.
+//
+// `HttpRule` defines the schema of the gRPC/REST mapping. The mapping specifies
+// how different portions of the gRPC request message are mapped to the URL
+// path, URL query parameters, and HTTP request body. It also controls how the
+// gRPC response message is mapped to the HTTP response body. `HttpRule` is
+// typically specified as an `google.api.http` annotation on the gRPC method.
+//
+// Each mapping specifies a URL path template and an HTTP method. The path
+// template may refer to one or more fields in the gRPC request message, as long
+// as each field is a non-repeated field with a primitive (non-message) type.
+// The path template controls how fields of the request message are mapped to
+// the URL path.
+//
+// Example:
+//
+//     service Messaging {
+//       rpc GetMessage(GetMessageRequest) returns (Message) {
+//         option (google.api.http) = {
+//             get: "/v1/{name=messages/*}"
+//         };
+//       }
+//     }
+//     message GetMessageRequest {
+//       string name = 1; // Mapped to URL path.
+//     }
+//     message Message {
+//       string text = 1; // The resource content.
+//     }
+//
+// This enables an HTTP REST to gRPC mapping as below:
+//
+// - HTTP: `GET /v1/messages/123456`
+// - gRPC: `GetMessage(name: "messages/123456")`
+//
+// Any fields in the request message which are not bound by the path template
+// automatically become HTTP query parameters if there is no HTTP request body.
+// For example:
+//
+//     service Messaging {
+//       rpc GetMessage(GetMessageRequest) returns (Message) {
+//         option (google.api.http) = {
+//             get:"/v1/messages/{message_id}"
+//         };
+//       }
+//     }
+//     message GetMessageRequest {
+//       message SubMessage {
+//         string subfield = 1;
+//       }
+//       string message_id = 1; // Mapped to URL path.
+//       int64 revision = 2;    // Mapped to URL query parameter `revision`.
+//       SubMessage sub = 3;    // Mapped to URL query parameter `sub.subfield`.
+//     }
+//
+// This enables a HTTP JSON to RPC mapping as below:
+//
+// - HTTP: `GET /v1/messages/123456?revision=2&sub.subfield=foo`
+// - gRPC: `GetMessage(message_id: "123456" revision: 2 sub:
+// SubMessage(subfield: "foo"))`
+//
+// Note that fields which are mapped to URL query parameters must have a
+// primitive type or a repeated primitive type or a non-repeated message type.
+// In the case of a repeated type, the parameter can be repeated in the URL
+// as `...?param=A&param=B`. In the case of a message type, each field of the
+// message is mapped to a separate parameter, such as
+// `...?foo.a=A&foo.b=B&foo.c=C`.
+//
+// For HTTP methods that allow a request body, the `body` field
+// specifies the mapping. Consider a REST update method on the
+// message resource collection:
+//
+//     service Messaging {
+//       rpc UpdateMessage(UpdateMessageRequest) returns (Message) {
+//         option (google.api.http) = {
+//           patch: "/v1/messages/{message_id}"
+//           body: "message"
+//         };
+//       }
+//     }
+//     message UpdateMessageRequest {
+//       string message_id = 1; // mapped to the URL
+//       Message message = 2;   // mapped to the body
+//     }
+//
+// The following HTTP JSON to RPC mapping is enabled, where the
+// representation of the JSON in the request body is determined by
+// protos JSON encoding:
+//
+// - HTTP: `PATCH /v1/messages/123456 { "text": "Hi!" }`
+// - gRPC: `UpdateMessage(message_id: "123456" message { text: "Hi!" })`
+//
+// The special name `*` can be used in the body mapping to define that
+// every field not bound by the path template should be mapped to the
+// request body.  This enables the following alternative definition of
+// the update method:
+//
+//     service Messaging {
+//       rpc UpdateMessage(Message) returns (Message) {
+//         option (google.api.http) = {
+//           patch: "/v1/messages/{message_id}"
+//           body: "*"
+//         };
+//       }
+//     }
+//     message Message {
+//       string message_id = 1;
+//       string text = 2;
+//     }
+//
+//
+// The following HTTP JSON to RPC mapping is enabled:
+//
+// - HTTP: `PATCH /v1/messages/123456 { "text": "Hi!" }`
+// - gRPC: `UpdateMessage(message_id: "123456" text: "Hi!")`
+//
+// Note that when using `*` in the body mapping, it is not possible to
+// have HTTP parameters, as all fields not bound by the path end in
+// the body. This makes this option more rarely used in practice when
+// defining REST APIs. The common usage of `*` is in custom methods
+// which don't use the URL at all for transferring data.
+//
+// It is possible to define multiple HTTP methods for one RPC by using
+// the `additional_bindings` option. Example:
+//
+//     service Messaging {
+//       rpc GetMessage(GetMessageRequest) returns (Message) {
+//         option (google.api.http) = {
+//           get: "/v1/messages/{message_id}"
+//           additional_bindings {
+//             get: "/v1/users/{user_id}/messages/{message_id}"
+//           }
+//         };
+//       }
+//     }
+//     message GetMessageRequest {
+//       string message_id = 1;
+//       string user_id = 2;
+//     }
+//
+// This enables the following two alternative HTTP JSON to RPC mappings:
+//
+// - HTTP: `GET /v1/messages/123456`
+// - gRPC: `GetMessage(message_id: "123456")`
+//
+// - HTTP: `GET /v1/users/me/messages/123456`
+// - gRPC: `GetMessage(user_id: "me" message_id: "123456")`
+//
+// Rules for HTTP mapping
+//
+// 1. Leaf request fields (recursive expansion nested messages in the request
+//    message) are classified into three categories:
+//    - Fields referred by the path template. They are passed via the URL path.
+//    - Fields referred by the [HttpRule.body][google.api.HttpRule.body]. They
+//    are passed via the HTTP
+//      request body.
+//    - All other fields are passed via the URL query parameters, and the
+//      parameter name is the field path in the request message. A repeated
+//      field can be represented as multiple query parameters under the same
+//      name.
+//  2. If [HttpRule.body][google.api.HttpRule.body] is "*", there is no URL
+//  query parameter, all fields
+//     are passed via URL path and HTTP request body.
+//  3. If [HttpRule.body][google.api.HttpRule.body] is omitted, there is no HTTP
+//  request body, all
+//     fields are passed via URL path and URL query parameters.
+//
+// Path template syntax
+//
+//     Template = "/" Segments [ Verb ] ;
+//     Segments = Segment { "/" Segment } ;
+//     Segment  = "*" | "**" | LITERAL | Variable ;
+//     Variable = "{" FieldPath [ "=" Segments ] "}" ;
+//     FieldPath = IDENT { "." IDENT } ;
+//     Verb     = ":" LITERAL ;
+//
+// The syntax `*` matches a single URL path segment. The syntax `**` matches
+// zero or more URL path segments, which must be the last part of the URL path
+// except the `Verb`.
+//
+// The syntax `Variable` matches part of the URL path as specified by its
+// template. A variable template must not contain other variables. If a variable
+// matches a single path segment, its template may be omitted, e.g. `{var}`
+// is equivalent to `{var=*}`.
+//
+// The syntax `LITERAL` matches literal text in the URL path. If the `LITERAL`
+// contains any reserved character, such characters should be percent-encoded
+// before the matching.
+//
+// If a variable contains exactly one path segment, such as `"{var}"` or
+// `"{var=*}"`, when such a variable is expanded into a URL path on the client
+// side, all characters except `[-_.~0-9a-zA-Z]` are percent-encoded. The
+// server side does the reverse decoding. Such variables show up in the
+// [Discovery
+// Document](https://developers.google.com/discovery/v1/reference/apis) as
+// `{var}`.
+//
+// If a variable contains multiple path segments, such as `"{var=foo/*}"`
+// or `"{var=**}"`, when such a variable is expanded into a URL path on the
+// client side, all characters except `[-_.~/0-9a-zA-Z]` are percent-encoded.
+// The server side does the reverse decoding, except "%2F" and "%2f" are left
+// unchanged. Such variables show up in the
+// [Discovery
+// Document](https://developers.google.com/discovery/v1/reference/apis) as
+// `{+var}`.
+//
+// Using gRPC API Service Configuration
+//
+// gRPC API Service Configuration (service config) is a configuration language
+// for configuring a gRPC service to become a user-facing product. The
+// service config is simply the YAML representation of the `google.api.Service`
+// proto message.
+//
+// As an alternative to annotating your proto file, you can configure gRPC
+// transcoding in your service config YAML files. You do this by specifying a
+// `HttpRule` that maps the gRPC method to a REST endpoint, achieving the same
+// effect as the proto annotation. This can be particularly useful if you
+// have a proto that is reused in multiple services. Note that any transcoding
+// specified in the service config will override any matching transcoding
+// configuration in the proto.
+//
+// The following example selects a gRPC method and applies an `HttpRule` to it:
+//
+//     http:
+//       rules:
+//         - selector: example.v1.Messaging.GetMessage
+//           get: /v1/messages/{message_id}/{sub.subfield}
+//
+// Special notes
+//
+// When gRPC Transcoding is used to map a gRPC to JSON REST endpoints, the
+// proto to JSON conversion must follow the [proto3
+// specification](https://developers.google.com/protocol-buffers/docs/proto3#json).
+//
+// While the single segment variable follows the semantics of
+// [RFC 6570](https://tools.ietf.org/html/rfc6570) Section 3.2.2 Simple String
+// Expansion, the multi segment variable **does not** follow RFC 6570 Section
+// 3.2.3 Reserved Expansion. The reason is that the Reserved Expansion
+// does not expand special characters like `?` and `#`, which would lead
+// to invalid URLs. As the result, gRPC Transcoding uses a custom encoding
+// for multi segment variables.
+//
+// The path variables **must not** refer to any repeated or mapped field,
+// because client libraries are not capable of handling such variable expansion.
+//
+// The path variables **must not** capture the leading "/" character. The reason
+// is that the most common use case "{var}" does not capture the leading "/"
+// character. For consistency, all path variables must share the same behavior.
+//
+// Repeated message fields must not be mapped to URL query parameters, because
+// no client library can support such complicated mapping.
+//
+// If an API needs to use a JSON array for request or response body, it can map
+// the request or response body to a repeated field. However, some gRPC
+// Transcoding implementations may not support this feature.
+message HttpRule {
+  // Selects a method to which this rule applies.
+  //
+  // Refer to [selector][google.api.DocumentationRule.selector] for syntax
+  // details.
+  string selector = 1;
+
+  // Determines the URL pattern is matched by this rules. This pattern can be
+  // used with any of the {get|put|post|delete|patch} methods. A custom method
+  // can be defined using the 'custom' field.
+  oneof pattern {
+    // Maps to HTTP GET. Used for listing and getting information about
+    // resources.
+    string get = 2;
+
+    // Maps to HTTP PUT. Used for replacing a resource.
+    string put = 3;
+
+    // Maps to HTTP POST. Used for creating a resource or performing an action.
+    string post = 4;
+
+    // Maps to HTTP DELETE. Used for deleting a resource.
+    string delete = 5;
+
+    // Maps to HTTP PATCH. Used for updating a resource.
+    string patch = 6;
+
+    // The custom pattern is used for specifying an HTTP method that is not
+    // included in the `pattern` field, such as HEAD, or "*" to leave the
+    // HTTP method unspecified for this rule. The wild-card rule is useful
+    // for services that provide content to Web (HTML) clients.
+    CustomHttpPattern custom = 8;
+  }
+
+  // The name of the request field whose value is mapped to the HTTP request
+  // body, or `*` for mapping all request fields not captured by the path
+  // pattern to the HTTP body, or omitted for not having any HTTP request body.
+  //
+  // NOTE: the referred field must be present at the top-level of the request
+  // message type.
+  string body = 7;
+
+  // Optional. The name of the response field whose value is mapped to the HTTP
+  // response body. When omitted, the entire response message will be used
+  // as the HTTP response body.
+  //
+  // NOTE: The referred field must be present at the top-level of the response
+  // message type.
+  string response_body = 12;
+
+  // Additional HTTP bindings for the selector. Nested bindings must
+  // not contain an `additional_bindings` field themselves (that is,
+  // the nesting may only be one level deep).
+  repeated HttpRule additional_bindings = 11;
+}
+
+// A custom pattern is used for defining custom HTTP verb.
+message CustomHttpPattern {
+  // The name of this custom HTTP verb.
+  string kind = 1;
+
+  // The path matched by this custom verb.
+  string path = 2;
+}
diff --git a/protoc_plugin/protos/google/api/launch_stage.proto b/protoc_plugin/protos/google/api/launch_stage.proto
new file mode 100644
index 0000000..1e86c1a
--- /dev/null
+++ b/protoc_plugin/protos/google/api/launch_stage.proto
@@ -0,0 +1,72 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package google.api;
+
+option go_package = "google.golang.org/genproto/googleapis/api;api";
+option java_multiple_files = true;
+option java_outer_classname = "LaunchStageProto";
+option java_package = "com.google.api";
+option objc_class_prefix = "GAPI";
+
+// The launch stage as defined by [Google Cloud Platform
+// Launch Stages](https://cloud.google.com/terms/launch-stages).
+enum LaunchStage {
+  // Do not use this default value.
+  LAUNCH_STAGE_UNSPECIFIED = 0;
+
+  // The feature is not yet implemented. Users can not use it.
+  UNIMPLEMENTED = 6;
+
+  // Prelaunch features are hidden from users and are only visible internally.
+  PRELAUNCH = 7;
+
+  // Early Access features are limited to a closed group of testers. To use
+  // these features, you must sign up in advance and sign a Trusted Tester
+  // agreement (which includes confidentiality provisions). These features may
+  // be unstable, changed in backward-incompatible ways, and are not
+  // guaranteed to be released.
+  EARLY_ACCESS = 1;
+
+  // Alpha is a limited availability test for releases before they are cleared
+  // for widespread use. By Alpha, all significant design issues are resolved
+  // and we are in the process of verifying functionality. Alpha customers
+  // need to apply for access, agree to applicable terms, and have their
+  // projects allowlisted. Alpha releases don't have to be feature complete,
+  // no SLAs are provided, and there are no technical support obligations, but
+  // they will be far enough along that customers can actually use them in
+  // test environments or for limited-use tests -- just like they would in
+  // normal production cases.
+  ALPHA = 2;
+
+  // Beta is the point at which we are ready to open a release for any
+  // customer to use. There are no SLA or technical support obligations in a
+  // Beta release. Products will be complete from a feature perspective, but
+  // may have some open outstanding issues. Beta releases are suitable for
+  // limited production use cases.
+  BETA = 3;
+
+  // GA features are open to all developers and are considered stable and
+  // fully qualified for production use.
+  GA = 4;
+
+  // Deprecated features are scheduled to be shut down and removed. For more
+  // information, see the "Deprecation Policy" section of our [Terms of
+  // Service](https://cloud.google.com/terms/)
+  // and the [Google Cloud Platform Subject to the Deprecation
+  // Policy](https://cloud.google.com/terms/deprecation) documentation.
+  DEPRECATED = 5;
+}
diff --git a/protoc_plugin/protos/plugin.proto b/protoc_plugin/protos/google/protobuf/compiler/plugin.proto
similarity index 99%
rename from protoc_plugin/protos/plugin.proto
rename to protoc_plugin/protos/google/protobuf/compiler/plugin.proto
index 7880c93..9242aac 100644
--- a/protoc_plugin/protos/plugin.proto
+++ b/protoc_plugin/protos/google/protobuf/compiler/plugin.proto
@@ -52,7 +52,7 @@
 
 option go_package = "google.golang.org/protobuf/types/pluginpb";
 
-import "descriptor.proto";
+import "google/protobuf/descriptor.proto";
 
 // The version number of protocol compiler.
 message Version {
diff --git a/protoc_plugin/protos/descriptor.proto b/protoc_plugin/protos/google/protobuf/descriptor.proto
similarity index 100%
rename from protoc_plugin/protos/descriptor.proto
rename to protoc_plugin/protos/google/protobuf/descriptor.proto
diff --git a/protoc_plugin/protos/google/protobuf/duration.proto b/protoc_plugin/protos/google/protobuf/duration.proto
new file mode 100644
index 0000000..41f40c2
--- /dev/null
+++ b/protoc_plugin/protos/google/protobuf/duration.proto
@@ -0,0 +1,115 @@
+// Protocol Buffers - Google's data interchange format
+// Copyright 2008 Google Inc.  All rights reserved.
+// https://developers.google.com/protocol-buffers/
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+syntax = "proto3";
+
+package google.protobuf;
+
+option cc_enable_arenas = true;
+option go_package = "google.golang.org/protobuf/types/known/durationpb";
+option java_package = "com.google.protobuf";
+option java_outer_classname = "DurationProto";
+option java_multiple_files = true;
+option objc_class_prefix = "GPB";
+option csharp_namespace = "Google.Protobuf.WellKnownTypes";
+
+// A Duration represents a signed, fixed-length span of time represented
+// as a count of seconds and fractions of seconds at nanosecond
+// resolution. It is independent of any calendar and concepts like "day"
+// or "month". It is related to Timestamp in that the difference between
+// two Timestamp values is a Duration and it can be added or subtracted
+// from a Timestamp. Range is approximately +-10,000 years.
+//
+// # Examples
+//
+// Example 1: Compute Duration from two Timestamps in pseudo code.
+//
+//     Timestamp start = ...;
+//     Timestamp end = ...;
+//     Duration duration = ...;
+//
+//     duration.seconds = end.seconds - start.seconds;
+//     duration.nanos = end.nanos - start.nanos;
+//
+//     if (duration.seconds < 0 && duration.nanos > 0) {
+//       duration.seconds += 1;
+//       duration.nanos -= 1000000000;
+//     } else if (duration.seconds > 0 && duration.nanos < 0) {
+//       duration.seconds -= 1;
+//       duration.nanos += 1000000000;
+//     }
+//
+// Example 2: Compute Timestamp from Timestamp + Duration in pseudo code.
+//
+//     Timestamp start = ...;
+//     Duration duration = ...;
+//     Timestamp end = ...;
+//
+//     end.seconds = start.seconds + duration.seconds;
+//     end.nanos = start.nanos + duration.nanos;
+//
+//     if (end.nanos < 0) {
+//       end.seconds -= 1;
+//       end.nanos += 1000000000;
+//     } else if (end.nanos >= 1000000000) {
+//       end.seconds += 1;
+//       end.nanos -= 1000000000;
+//     }
+//
+// Example 3: Compute Duration from datetime.timedelta in Python.
+//
+//     td = datetime.timedelta(days=3, minutes=10)
+//     duration = Duration()
+//     duration.FromTimedelta(td)
+//
+// # JSON Mapping
+//
+// In JSON format, the Duration type is encoded as a string rather than an
+// object, where the string ends in the suffix "s" (indicating seconds) and
+// is preceded by the number of seconds, with nanoseconds expressed as
+// fractional seconds. For example, 3 seconds with 0 nanoseconds should be
+// encoded in JSON format as "3s", while 3 seconds and 1 nanosecond should
+// be expressed in JSON format as "3.000000001s", and 3 seconds and 1
+// microsecond should be expressed in JSON format as "3.000001s".
+//
+message Duration {
+  // Signed seconds of the span of time. Must be from -315,576,000,000
+  // to +315,576,000,000 inclusive. Note: these bounds are computed from:
+  // 60 sec/min * 60 min/hr * 24 hr/day * 365.25 days/year * 10000 years
+  int64 seconds = 1;
+
+  // Signed fractions of a second at nanosecond resolution of the span
+  // of time. Durations less than one second are represented with a 0
+  // `seconds` field and a positive or negative `nanos` field. For durations
+  // of one second or more, a non-zero value for the `nanos` field must be
+  // of the same sign as the `seconds` field. Must be from -999,999,999
+  // to +999,999,999 inclusive.
+  int32 nanos = 2;
+}
diff --git a/protoc_plugin/test/descriptor_test.dart b/protoc_plugin/test/descriptor_test.dart
index 34085cf..c066bf8 100644
--- a/protoc_plugin/test/descriptor_test.dart
+++ b/protoc_plugin/test/descriptor_test.dart
@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:protobuf/protobuf.dart';
-import 'package:protoc_plugin/src/generated/descriptor.pb.dart';
+import 'package:protoc_plugin/src/gen/google/protobuf/descriptor.pb.dart';
 import 'package:test/test.dart';
 
 import '../out/protos/custom_option.pb.dart';
diff --git a/protoc_plugin/test/enum_generator_test.dart b/protoc_plugin/test/enum_generator_test.dart
index e171e6f..4f5ec37 100644
--- a/protoc_plugin/test/enum_generator_test.dart
+++ b/protoc_plugin/test/enum_generator_test.dart
@@ -4,7 +4,7 @@
 
 import 'package:protoc_plugin/indenting_writer.dart';
 import 'package:protoc_plugin/protoc.dart';
-import 'package:protoc_plugin/src/generated/descriptor.pb.dart';
+import 'package:protoc_plugin/src/gen/google/protobuf/descriptor.pb.dart';
 import 'package:protoc_plugin/src/options.dart';
 import 'package:test/test.dart';
 
diff --git a/protoc_plugin/test/extension_generator_test.dart b/protoc_plugin/test/extension_generator_test.dart
index 8770eae..57cd2b9 100644
--- a/protoc_plugin/test/extension_generator_test.dart
+++ b/protoc_plugin/test/extension_generator_test.dart
@@ -4,8 +4,9 @@
 
 import 'package:protoc_plugin/indenting_writer.dart';
 import 'package:protoc_plugin/protoc.dart';
-import 'package:protoc_plugin/src/generated/descriptor.pb.dart' as pb;
-import 'package:protoc_plugin/src/generated/plugin.pb.dart' as pb;
+import 'package:protoc_plugin/src/gen/google/protobuf/compiler/plugin.pb.dart'
+    as pb;
+import 'package:protoc_plugin/src/gen/google/protobuf/descriptor.pb.dart' as pb;
 import 'package:protoc_plugin/src/linker.dart';
 import 'package:protoc_plugin/src/options.dart';
 import 'package:test/test.dart';
diff --git a/protoc_plugin/test/file_generator_test.dart b/protoc_plugin/test/file_generator_test.dart
index 26a297d..3a22888 100644
--- a/protoc_plugin/test/file_generator_test.dart
+++ b/protoc_plugin/test/file_generator_test.dart
@@ -4,9 +4,9 @@
 
 import 'package:protoc_plugin/indenting_writer.dart';
 import 'package:protoc_plugin/protoc.dart';
-import 'package:protoc_plugin/src/generated/client.pb.dart';
-import 'package:protoc_plugin/src/generated/descriptor.pb.dart';
-import 'package:protoc_plugin/src/generated/plugin.pb.dart';
+import 'package:protoc_plugin/src/gen/google/api/client.pb.dart';
+import 'package:protoc_plugin/src/gen/google/protobuf/compiler/plugin.pb.dart';
+import 'package:protoc_plugin/src/gen/google/protobuf/descriptor.pb.dart';
 import 'package:protoc_plugin/src/linker.dart';
 import 'package:protoc_plugin/src/options.dart';
 import 'package:test/test.dart';
diff --git a/protoc_plugin/test/indenting_writer_test.dart b/protoc_plugin/test/indenting_writer_test.dart
index 81ec9fe..6af4797 100644
--- a/protoc_plugin/test/indenting_writer_test.dart
+++ b/protoc_plugin/test/indenting_writer_test.dart
@@ -3,7 +3,7 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:protoc_plugin/indenting_writer.dart';
-import 'package:protoc_plugin/src/generated/descriptor.pb.dart';
+import 'package:protoc_plugin/src/gen/google/protobuf/descriptor.pb.dart';
 import 'package:test/test.dart';
 
 void main() {
diff --git a/protoc_plugin/test/message_generator_test.dart b/protoc_plugin/test/message_generator_test.dart
index c25fa0e..c4cadda 100644
--- a/protoc_plugin/test/message_generator_test.dart
+++ b/protoc_plugin/test/message_generator_test.dart
@@ -7,8 +7,8 @@
 import 'package:collection/collection.dart';
 import 'package:protoc_plugin/indenting_writer.dart';
 import 'package:protoc_plugin/protoc.dart';
-import 'package:protoc_plugin/src/generated/descriptor.pb.dart';
-import 'package:protoc_plugin/src/generated/plugin.pb.dart';
+import 'package:protoc_plugin/src/gen/google/protobuf/compiler/plugin.pb.dart';
+import 'package:protoc_plugin/src/gen/google/protobuf/descriptor.pb.dart';
 import 'package:protoc_plugin/src/linker.dart';
 import 'package:protoc_plugin/src/options.dart';
 import 'package:test/test.dart';
diff --git a/protoc_plugin/test/message_test.dart b/protoc_plugin/test/message_test.dart
index 9064721..d1d6806 100644
--- a/protoc_plugin/test/message_test.dart
+++ b/protoc_plugin/test/message_test.dart
@@ -4,7 +4,7 @@
 
 // ignore_for_file: deprecated_member_use_from_same_package
 
-import 'package:protoc_plugin/src/generated/descriptor.pb.dart'
+import 'package:protoc_plugin/src/gen/google/protobuf/descriptor.pb.dart'
     show DescriptorProto;
 import 'package:test/test.dart';
 
diff --git a/protoc_plugin/test/names_test.dart b/protoc_plugin/test/names_test.dart
index ae83b38..9cbece6 100644
--- a/protoc_plugin/test/names_test.dart
+++ b/protoc_plugin/test/names_test.dart
@@ -3,8 +3,8 @@
 // BSD-style license that can be found in the LICENSE file.
 
 import 'package:protoc_plugin/names.dart' as names;
-import 'package:protoc_plugin/src/generated/dart_options.pb.dart';
-import 'package:protoc_plugin/src/generated/descriptor.pb.dart';
+import 'package:protoc_plugin/src/gen/dart_options.pb.dart';
+import 'package:protoc_plugin/src/gen/google/protobuf/descriptor.pb.dart';
 import 'package:test/test.dart';
 
 import '../out/protos/dart_name.pb.dart' as pb;
diff --git a/protoc_plugin/test/protoc_options_test.dart b/protoc_plugin/test/protoc_options_test.dart
index fd64bbf..78bac76 100644
--- a/protoc_plugin/test/protoc_options_test.dart
+++ b/protoc_plugin/test/protoc_options_test.dart
@@ -2,7 +2,7 @@
 // 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:protoc_plugin/src/generated/plugin.pb.dart';
+import 'package:protoc_plugin/src/gen/google/protobuf/compiler/plugin.pb.dart';
 import 'package:protoc_plugin/src/options.dart';
 import 'package:test/test.dart';
 
diff --git a/protoc_plugin/test/protos/custom_option.proto b/protoc_plugin/test/protos/custom_option.proto
index cb4fc2e..57e31fb 100644
--- a/protoc_plugin/test/protos/custom_option.proto
+++ b/protoc_plugin/test/protos/custom_option.proto
@@ -6,7 +6,7 @@
 
 package custom_option;
 
-import "descriptor.proto";
+import "google/protobuf/descriptor.proto";
 
 extend google.protobuf.MessageOptions {
   optional string my_option = 51234;
diff --git a/protoc_plugin/test/service_test.dart b/protoc_plugin/test/service_test.dart
index 51e9d92..04cab34 100644
--- a/protoc_plugin/test/service_test.dart
+++ b/protoc_plugin/test/service_test.dart
@@ -1,5 +1,5 @@
 import 'package:protobuf/protobuf.dart';
-import 'package:protoc_plugin/src/generated/descriptor.pb.dart'
+import 'package:protoc_plugin/src/gen/google/protobuf/descriptor.pb.dart'
     show DescriptorProto, ServiceDescriptorProto;
 import 'package:test/test.dart';
 
diff --git a/protoc_plugin/test/service_util.dart b/protoc_plugin/test/service_util.dart
index b26e1e6..627254f 100644
--- a/protoc_plugin/test/service_util.dart
+++ b/protoc_plugin/test/service_util.dart
@@ -2,7 +2,7 @@
 // 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:protoc_plugin/src/generated/descriptor.pb.dart';
+import 'package:protoc_plugin/src/gen/google/protobuf/descriptor.pb.dart';
 
 ServiceDescriptorProto buildServiceDescriptor() {
   final sd = ServiceDescriptorProto()