Migrate examples to Dart null safety

example/googleapis/README.md

@@ -19,13 +19,13 @@ To run the example, assuming you are in the root of the googleapis folder, i.e.,
 .../example/googleapis/, first get the dependencies by running:
 
 ```sh
-$ pub get
+$ dart pub get
 ```
 
 Then, to run the logging client sample:
 
 ```sh
-$ pub run googleapis:logging
+$ dart run bin/logging.dart
 ```
 
 # Regenerate the stubs

example/googleapis/lib/src/generated/google/api/label.pb.dart

@@ -2,7 +2,7 @@
 //  Generated code. Do not modify.
 //  source: google/api/label.proto
 //
-// @dart = 2.7
+// @dart = 2.12
 // ignore_for_file: annotate_overrides,camel_case_types,unnecessary_const,non_constant_identifier_names,library_prefixes,unused_import,unused_shown_name,return_of_invalid_type,unnecessary_this,prefer_final_fields
 
 import 'dart:core' as $core;
@@ -46,9 +46,9 @@ class LabelDescriptor extends $pb.GeneratedMessage {
 
   LabelDescriptor._() : super();
   factory LabelDescriptor({
-    $core.String key,
-    LabelDescriptor_ValueType valueType,
-    $core.String description,
+    $core.String? key,
+    LabelDescriptor_ValueType? valueType,
+    $core.String? description,
   }) {
     final _result = create();
     if (key != null) {
@@ -76,8 +76,8 @@ class LabelDescriptor extends $pb.GeneratedMessage {
       'Use [GeneratedMessageGenericExtensions.rebuild] instead. '
       'Will be removed in next major version')
   LabelDescriptor copyWith(void Function(LabelDescriptor) updates) =>
-      super.copyWith((message) =>
-          updates(message as LabelDescriptor)); // ignore: deprecated_member_use
+      super.copyWith((message) => updates(message as LabelDescriptor))
+          as LabelDescriptor; // ignore: deprecated_member_use
   $pb.BuilderInfo get info_ => _i;
   @$core.pragma('dart2js:noInline')
   static LabelDescriptor create() => LabelDescriptor._();
@@ -87,7 +87,7 @@ class LabelDescriptor extends $pb.GeneratedMessage {
   @$core.pragma('dart2js:noInline')
   static LabelDescriptor getDefault() => _defaultInstance ??=
       $pb.GeneratedMessage.$_defaultFor<LabelDescriptor>(create);
-  static LabelDescriptor _defaultInstance;
+  static LabelDescriptor? _defaultInstance;
 
   @$pb.TagNumber(1)
   $core.String get key => $_getSZ(0);

example/googleapis/lib/src/generated/google/api/label.pbenum.dart

@@ -2,7 +2,7 @@
 //  Generated code. Do not modify.
 //  source: google/api/label.proto
 //
-// @dart = 2.7
+// @dart = 2.12
 // ignore_for_file: annotate_overrides,camel_case_types,unnecessary_const,non_constant_identifier_names,library_prefixes,unused_import,unused_shown_name,return_of_invalid_type,unnecessary_this,prefer_final_fields
 
 // ignore_for_file: UNDEFINED_SHOWN_NAME
@@ -35,7 +35,7 @@ class LabelDescriptor_ValueType extends $pb.ProtobufEnum {
 
   static final $core.Map<$core.int, LabelDescriptor_ValueType> _byValue =
       $pb.ProtobufEnum.initByValue(values);
-  static LabelDescriptor_ValueType valueOf($core.int value) => _byValue[value];
+  static LabelDescriptor_ValueType? valueOf($core.int value) => _byValue[value];
 
   const LabelDescriptor_ValueType._($core.int v, $core.String n) : super(v, n);
 }

example/googleapis/lib/src/generated/google/api/label.pbjson.dart

@@ -2,9 +2,14 @@
 //  Generated code. Do not modify.
 //  source: google/api/label.proto
 //
-// @dart = 2.7
-// ignore_for_file: annotate_overrides,camel_case_types,unnecessary_const,non_constant_identifier_names,library_prefixes,unused_import,unused_shown_name,return_of_invalid_type,unnecessary_this,prefer_final_fields
+// @dart = 2.12
+// ignore_for_file: annotate_overrides,camel_case_types,unnecessary_const,non_constant_identifier_names,library_prefixes,unused_import,unused_shown_name,return_of_invalid_type,unnecessary_this,prefer_final_fields,deprecated_member_use_from_same_package
 
+import 'dart:core' as $core;
+import 'dart:convert' as $convert;
+import 'dart:typed_data' as $typed_data;
+
+@$core.Deprecated('Use labelDescriptorDescriptor instead')
 const LabelDescriptor$json = const {
   '1': 'LabelDescriptor',
   '2': const [
@@ -22,6 +27,7 @@ const LabelDescriptor$json = const {
   '4': const [LabelDescriptor_ValueType$json],
 };
 
+@$core.Deprecated('Use labelDescriptorDescriptor instead')
 const LabelDescriptor_ValueType$json = const {
   '1': 'ValueType',
   '2': const [
@@ -30,3 +36,7 @@ const LabelDescriptor_ValueType$json = const {
     const {'1': 'INT64', '2': 2},
   ],
 };
+
+/// Descriptor for `LabelDescriptor`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List labelDescriptorDescriptor = $convert.base64Decode(
+    'Cg9MYWJlbERlc2NyaXB0b3ISEAoDa2V5GAEgASgJUgNrZXkSRAoKdmFsdWVfdHlwZRgCIAEoDjIlLmdvb2dsZS5hcGkuTGFiZWxEZXNjcmlwdG9yLlZhbHVlVHlwZVIJdmFsdWVUeXBlEiAKC2Rlc2NyaXB0aW9uGAMgASgJUgtkZXNjcmlwdGlvbiIsCglWYWx1ZVR5cGUSCgoGU1RSSU5HEAASCAoEQk9PTBABEgkKBUlOVDY0EAI=');

example/googleapis/lib/src/generated/google/api/launch_stage.pb.dart

@@ -2,7 +2,7 @@
 //  Generated code. Do not modify.
 //  source: google/api/launch_stage.proto
 //
-// @dart = 2.7
+// @dart = 2.12
 // ignore_for_file: annotate_overrides,camel_case_types,unnecessary_const,non_constant_identifier_names,library_prefixes,unused_import,unused_shown_name,return_of_invalid_type,unnecessary_this,prefer_final_fields
 
 import 'dart:core' as $core;

example/googleapis/lib/src/generated/google/api/launch_stage.pbenum.dart

@@ -2,7 +2,7 @@
 //  Generated code. Do not modify.
 //  source: google/api/launch_stage.proto
 //
-// @dart = 2.7
+// @dart = 2.12
 // ignore_for_file: annotate_overrides,camel_case_types,unnecessary_const,non_constant_identifier_names,library_prefixes,unused_import,unused_shown_name,return_of_invalid_type,unnecessary_this,prefer_final_fields
 
 // ignore_for_file: UNDEFINED_SHOWN_NAME
@@ -61,7 +61,7 @@ class LaunchStage extends $pb.ProtobufEnum {
 
   static final $core.Map<$core.int, LaunchStage> _byValue =
       $pb.ProtobufEnum.initByValue(values);
-  static LaunchStage valueOf($core.int value) => _byValue[value];
+  static LaunchStage? valueOf($core.int value) => _byValue[value];
 
   const LaunchStage._($core.int v, $core.String n) : super(v, n);
 }

example/googleapis/lib/src/generated/google/api/launch_stage.pbjson.dart

@@ -2,9 +2,14 @@
 //  Generated code. Do not modify.
 //  source: google/api/launch_stage.proto
 //
-// @dart = 2.7
-// ignore_for_file: annotate_overrides,camel_case_types,unnecessary_const,non_constant_identifier_names,library_prefixes,unused_import,unused_shown_name,return_of_invalid_type,unnecessary_this,prefer_final_fields
+// @dart = 2.12
+// ignore_for_file: annotate_overrides,camel_case_types,unnecessary_const,non_constant_identifier_names,library_prefixes,unused_import,unused_shown_name,return_of_invalid_type,unnecessary_this,prefer_final_fields,deprecated_member_use_from_same_package
 
+import 'dart:core' as $core;
+import 'dart:convert' as $convert;
+import 'dart:typed_data' as $typed_data;
+
+@$core.Deprecated('Use launchStageDescriptor instead')
 const LaunchStage$json = const {
   '1': 'LaunchStage',
   '2': const [
@@ -18,3 +23,7 @@ const LaunchStage$json = const {
     const {'1': 'DEPRECATED', '2': 5},
   ],
 };
+
+/// Descriptor for `LaunchStage`. Decode as a `google.protobuf.EnumDescriptorProto`.
+final $typed_data.Uint8List launchStageDescriptor = $convert.base64Decode(
+    'CgtMYXVuY2hTdGFnZRIcChhMQVVOQ0hfU1RBR0VfVU5TUEVDSUZJRUQQABIRCg1VTklNUExFTUVOVEVEEAYSDQoJUFJFTEFVTkNIEAcSEAoMRUFSTFlfQUNDRVNTEAESCQoFQUxQSEEQAhIICgRCRVRBEAMSBgoCR0EQBBIOCgpERVBSRUNBVEVEEAU=');

example/googleapis/lib/src/generated/google/api/monitored_resource.pb.dart

@@ -2,7 +2,7 @@
 //  Generated code. Do not modify.
 //  source: google/api/monitored_resource.proto
 //
-// @dart = 2.7
+// @dart = 2.12
 // ignore_for_file: annotate_overrides,camel_case_types,unnecessary_const,non_constant_identifier_names,library_prefixes,unused_import,unused_shown_name,return_of_invalid_type,unnecessary_this,prefer_final_fields
 
 import 'dart:core' as $core;
@@ -64,12 +64,12 @@ class MonitoredResourceDescriptor extends $pb.GeneratedMessage {
 
   MonitoredResourceDescriptor._() : super();
   factory MonitoredResourceDescriptor({
-    $core.String type,
-    $core.String displayName,
-    $core.String description,
-    $core.Iterable<$0.LabelDescriptor> labels,
-    $core.String name,
-    $2.LaunchStage launchStage,
+    $core.String? type,
+    $core.String? displayName,
+    $core.String? description,
+    $core.Iterable<$0.LabelDescriptor>? labels,
+    $core.String? name,
+    $2.LaunchStage? launchStage,
   }) {
     final _result = create();
     if (type != null) {
@@ -108,8 +108,9 @@ class MonitoredResourceDescriptor extends $pb.GeneratedMessage {
       'Will be removed in next major version')
   MonitoredResourceDescriptor copyWith(
           void Function(MonitoredResourceDescriptor) updates) =>
-      super.copyWith((message) => updates(message
-          as MonitoredResourceDescriptor)); // ignore: deprecated_member_use
+      super.copyWith(
+              (message) => updates(message as MonitoredResourceDescriptor))
+          as MonitoredResourceDescriptor; // ignore: deprecated_member_use
   $pb.BuilderInfo get info_ => _i;
   @$core.pragma('dart2js:noInline')
   static MonitoredResourceDescriptor create() =>
@@ -120,7 +121,7 @@ class MonitoredResourceDescriptor extends $pb.GeneratedMessage {
   @$core.pragma('dart2js:noInline')
   static MonitoredResourceDescriptor getDefault() => _defaultInstance ??=
       $pb.GeneratedMessage.$_defaultFor<MonitoredResourceDescriptor>(create);
-  static MonitoredResourceDescriptor _defaultInstance;
+  static MonitoredResourceDescriptor? _defaultInstance;
 
   @$pb.TagNumber(1)
   $core.String get type => $_getSZ(0);
@@ -214,8 +215,8 @@ class MonitoredResource extends $pb.GeneratedMessage {
 
   MonitoredResource._() : super();
   factory MonitoredResource({
-    $core.String type,
-    $core.Map<$core.String, $core.String> labels,
+    $core.String? type,
+    $core.Map<$core.String, $core.String>? labels,
   }) {
     final _result = create();
     if (type != null) {
@@ -240,8 +241,8 @@ class MonitoredResource extends $pb.GeneratedMessage {
       'Use [GeneratedMessageGenericExtensions.rebuild] instead. '
       'Will be removed in next major version')
   MonitoredResource copyWith(void Function(MonitoredResource) updates) =>
-      super.copyWith((message) => updates(
-          message as MonitoredResource)); // ignore: deprecated_member_use
+      super.copyWith((message) => updates(message as MonitoredResource))
+          as MonitoredResource; // ignore: deprecated_member_use
   $pb.BuilderInfo get info_ => _i;
   @$core.pragma('dart2js:noInline')
   static MonitoredResource create() => MonitoredResource._();
@@ -251,7 +252,7 @@ class MonitoredResource extends $pb.GeneratedMessage {
   @$core.pragma('dart2js:noInline')
   static MonitoredResource getDefault() => _defaultInstance ??=
       $pb.GeneratedMessage.$_defaultFor<MonitoredResource>(create);
-  static MonitoredResource _defaultInstance;
+  static MonitoredResource? _defaultInstance;
 
   @$pb.TagNumber(1)
   $core.String get type => $_getSZ(0);
@@ -298,8 +299,8 @@ class MonitoredResourceMetadata extends $pb.GeneratedMessage {
 
   MonitoredResourceMetadata._() : super();
   factory MonitoredResourceMetadata({
-    $1.Struct systemLabels,
-    $core.Map<$core.String, $core.String> userLabels,
+    $1.Struct? systemLabels,
+    $core.Map<$core.String, $core.String>? userLabels,
   }) {
     final _result = create();
     if (systemLabels != null) {
@@ -326,8 +327,8 @@ class MonitoredResourceMetadata extends $pb.GeneratedMessage {
       'Will be removed in next major version')
   MonitoredResourceMetadata copyWith(
           void Function(MonitoredResourceMetadata) updates) =>
-      super.copyWith((message) => updates(message
-          as MonitoredResourceMetadata)); // ignore: deprecated_member_use
+      super.copyWith((message) => updates(message as MonitoredResourceMetadata))
+          as MonitoredResourceMetadata; // ignore: deprecated_member_use
   $pb.BuilderInfo get info_ => _i;
   @$core.pragma('dart2js:noInline')
   static MonitoredResourceMetadata create() => MonitoredResourceMetadata._();
@@ -337,7 +338,7 @@ class MonitoredResourceMetadata extends $pb.GeneratedMessage {
   @$core.pragma('dart2js:noInline')
   static MonitoredResourceMetadata getDefault() => _defaultInstance ??=
       $pb.GeneratedMessage.$_defaultFor<MonitoredResourceMetadata>(create);
-  static MonitoredResourceMetadata _defaultInstance;
+  static MonitoredResourceMetadata? _defaultInstance;
 
   @$pb.TagNumber(1)
   $1.Struct get systemLabels => $_getN(0);

example/googleapis/lib/src/generated/google/api/monitored_resource.pbenum.dart

@@ -2,5 +2,5 @@
 //  Generated code. Do not modify.
 //  source: google/api/monitored_resource.proto
 //
-// @dart = 2.7
+// @dart = 2.12
 // ignore_for_file: annotate_overrides,camel_case_types,unnecessary_const,non_constant_identifier_names,library_prefixes,unused_import,unused_shown_name,return_of_invalid_type,unnecessary_this,prefer_final_fields

example/googleapis/lib/src/generated/google/api/monitored_resource.pbjson.dart

@@ -2,9 +2,14 @@
 //  Generated code. Do not modify.
 //  source: google/api/monitored_resource.proto
 //
-// @dart = 2.7
-// ignore_for_file: annotate_overrides,camel_case_types,unnecessary_const,non_constant_identifier_names,library_prefixes,unused_import,unused_shown_name,return_of_invalid_type,unnecessary_this,prefer_final_fields
+// @dart = 2.12
+// ignore_for_file: annotate_overrides,camel_case_types,unnecessary_const,non_constant_identifier_names,library_prefixes,unused_import,unused_shown_name,return_of_invalid_type,unnecessary_this,prefer_final_fields,deprecated_member_use_from_same_package
 
+import 'dart:core' as $core;
+import 'dart:convert' as $convert;
+import 'dart:typed_data' as $typed_data;
+
+@$core.Deprecated('Use monitoredResourceDescriptorDescriptor instead')
 const MonitoredResourceDescriptor$json = const {
   '1': 'MonitoredResourceDescriptor',
   '2': const [
@@ -31,6 +36,11 @@ const MonitoredResourceDescriptor$json = const {
   ],
 };
 
+/// Descriptor for `MonitoredResourceDescriptor`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List monitoredResourceDescriptorDescriptor =
+    $convert.base64Decode(
+        'ChtNb25pdG9yZWRSZXNvdXJjZURlc2NyaXB0b3ISEgoEbmFtZRgFIAEoCVIEbmFtZRISCgR0eXBlGAEgASgJUgR0eXBlEiEKDGRpc3BsYXlfbmFtZRgCIAEoCVILZGlzcGxheU5hbWUSIAoLZGVzY3JpcHRpb24YAyABKAlSC2Rlc2NyaXB0aW9uEjMKBmxhYmVscxgEIAMoCzIbLmdvb2dsZS5hcGkuTGFiZWxEZXNjcmlwdG9yUgZsYWJlbHMSOgoMbGF1bmNoX3N0YWdlGAcgASgOMhcuZ29vZ2xlLmFwaS5MYXVuY2hTdGFnZVILbGF1bmNoU3RhZ2U=');
+@$core.Deprecated('Use monitoredResourceDescriptor instead')
 const MonitoredResource$json = const {
   '1': 'MonitoredResource',
   '2': const [
@@ -47,6 +57,7 @@ const MonitoredResource$json = const {
   '3': const [MonitoredResource_LabelsEntry$json],
 };
 
+@$core.Deprecated('Use monitoredResourceDescriptor instead')
 const MonitoredResource_LabelsEntry$json = const {
   '1': 'LabelsEntry',
   '2': const [
@@ -56,6 +67,10 @@ const MonitoredResource_LabelsEntry$json = const {
   '7': const {'7': true},
 };
 
+/// Descriptor for `MonitoredResource`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List monitoredResourceDescriptor = $convert.base64Decode(
+    'ChFNb25pdG9yZWRSZXNvdXJjZRISCgR0eXBlGAEgASgJUgR0eXBlEkEKBmxhYmVscxgCIAMoCzIpLmdvb2dsZS5hcGkuTW9uaXRvcmVkUmVzb3VyY2UuTGFiZWxzRW50cnlSBmxhYmVscxo5CgtMYWJlbHNFbnRyeRIQCgNrZXkYASABKAlSA2tleRIUCgV2YWx1ZRgCIAEoCVIFdmFsdWU6AjgB');
+@$core.Deprecated('Use monitoredResourceMetadataDescriptor instead')
 const MonitoredResourceMetadata$json = const {
   '1': 'MonitoredResourceMetadata',
   '2': const [
@@ -79,6 +94,7 @@ const MonitoredResourceMetadata$json = const {
   '3': const [MonitoredResourceMetadata_UserLabelsEntry$json],
 };
 
+@$core.Deprecated('Use monitoredResourceMetadataDescriptor instead')
 const MonitoredResourceMetadata_UserLabelsEntry$json = const {
   '1': 'UserLabelsEntry',
   '2': const [
@@ -87,3 +103,8 @@ const MonitoredResourceMetadata_UserLabelsEntry$json = const {
   ],
   '7': const {'7': true},
 };
+
+/// Descriptor for `MonitoredResourceMetadata`. Decode as a `google.protobuf.DescriptorProto`.
+final $typed_data.Uint8List monitoredResourceMetadataDescriptor =
+    $convert.base64Decode(
+        'ChlNb25pdG9yZWRSZXNvdXJjZU1ldGFkYXRhEjwKDXN5c3RlbV9sYWJlbHMYASABKAsyFy5nb29nbGUucHJvdG9idWYuU3RydWN0UgxzeXN0ZW1MYWJlbHMSVgoLdXNlcl9sYWJlbHMYAiADKAsyNS5nb29nbGUuYXBpLk1vbml0b3JlZFJlc291cmNlTWV0YWRhdGEuVXNlckxhYmVsc0VudHJ5Ugp1c2VyTGFiZWxzGj0KD1VzZXJMYWJlbHNFbnRyeRIQCgNrZXkYASABKAlSA2tleRIUCgV2YWx1ZRgCIAEoCVIFdmFsdWU6AjgB');