升级Flutter 3.0

example/lib/api/model/tencent_unionid_resp.dart

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+import 'dart:convert';
+
+import 'package:json_annotation/json_annotation.dart';
+
+part 'tencent_unionid_resp.g.dart';
+
+@JsonSerializable(
+  explicitToJson: true,
+  fieldRename: FieldRename.snake,
+)
+class TencentUnionidResp {
+  const TencentUnionidResp({
+    required this.error,
+    this.errorDescription,
+    this.clientId,
+    this.openid,
+    this.unionid,
+  });
+
+  factory TencentUnionidResp.fromJson(Map<String, dynamic> json) =>
+      _$TencentUnionidRespFromJson(json);
+
+  @JsonKey(
+    defaultValue: ERROR_SUCCESS,
+  )
+  final int error;
+  final String? errorDescription;
+  final String? clientId;
+  final String? openid;
+  final String? unionid;
+
+  static const int ERROR_SUCCESS = 0;
+
+  bool get isSuccessful => error == ERROR_SUCCESS;
+
+  Map<String, dynamic> toJson() => _$TencentUnionidRespToJson(this);
+
+  @override
+  String toString() => const JsonEncoder.withIndent('  ').convert(toJson());
+}