default to true

Author: wing328

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartDioClientCodegen.java

@@ -72,7 +72,7 @@ public class DartDioClientCodegen extends AbstractDartCodegen {
     public static final String FINAL_PROPERTIES_DEFAULT_VALUE = "true";
 
     public static final String SUPPORT_DART2 = "supportDart2";
-    public static final String SUPPORT_DART2_DEFAULT_VALUE = "false";
+    public static final String SUPPORT_DART2_DEFAULT_VALUE = "true";
 
     private static final String CLIENT_NAME = "clientName";
 
@@ -144,7 +144,7 @@ public DartDioClientCodegen() {
 
         // Support Dart 2 Option
         final CliOption supportDart2 = CliOption.newBoolean(SUPPORT_DART2, "Use dependencies compatible with Dart 2.");
-        supportDart2.setDefault("false");
+        supportDart2.setDefault("true");
         cliOptions.add(supportDart2);
     }
 

samples/openapi3/client/petstore/dart-dio/oneof/README.md

@@ -9,7 +9,7 @@ This Dart package is automatically generated by the [OpenAPI Generator](https://
 
 ## Requirements
 
-* Dart 3.0.0+ or Flutter 2.8.0+
+* Dart 2.15.0+ or Flutter 2.8.0+
 * Dio 5.0.0+ (https://pub.dev/packages/dio)
 
 ## Installation & Usage

samples/openapi3/client/petstore/dart-dio/oneof_polymorphism_and_inheritance/README.md

@@ -10,7 +10,7 @@ This Dart package is automatically generated by the [OpenAPI Generator](https://
 
 ## Requirements
 
-* Dart 3.0.0+ or Flutter 2.8.0+
+* Dart 2.15.0+ or Flutter 2.8.0+
 * Dio 5.0.0+ (https://pub.dev/packages/dio)
 
 ## Installation & Usage

samples/openapi3/client/petstore/dart-dio/oneof_primitive/README.md

@@ -9,7 +9,7 @@ This Dart package is automatically generated by the [OpenAPI Generator](https://
 
 ## Requirements
 
-* Dart 3.0.0+ or Flutter 2.8.0+
+* Dart 2.15.0+ or Flutter 2.8.0+
 * Dio 5.0.0+ (https://pub.dev/packages/dio)
 
 ## Installation & Usage

samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake-json_serializable/README.md

@@ -9,7 +9,7 @@ This Dart package is automatically generated by the [OpenAPI Generator](https://
 
 ## Requirements
 
-* Dart 3.0.0+ or Flutter 2.8.0+
+* Dart 2.15.0+ or Flutter 2.8.0+
 * Dio 5.0.0+ (https://pub.dev/packages/dio)
 * JSON Serializable 6.1.5+ (https://pub.dev/packages/json_serializable)
 

samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake-json_serializable/pubspec.yaml

@@ -4,13 +4,13 @@ description: OpenAPI API client
 homepage: homepage
 
 environment:
-  sdk: '>=3.0.0 <4.0.0'
+  sdk: '>=2.17.0 <4.0.0'
 
 dependencies:
   dio: '^5.2.0'
   json_annotation: '^4.4.0'
 
 dev_dependencies:
   build_runner: any
-  json_serializable: '^6.9.0'
+  json_serializable: '>=6.1.5 <6.9.0'
   test: ^1.16.0

samples/openapi3/client/petstore/dart-dio/petstore_client_lib_fake/README.md

@@ -9,7 +9,7 @@ This Dart package is automatically generated by the [OpenAPI Generator](https://
 
 ## Requirements
 
-* Dart 3.0.0+ or Flutter 2.8.0+
+* Dart 2.15.0+ or Flutter 2.8.0+
 * Dio 5.0.0+ (https://pub.dev/packages/dio)
 
 ## Installation & Usage