added client generation setting as per

https://learn.microsoft.com/en-us/aspnet/core/tutorials/getting-started-with-nswag?view=aspnetcore-8.0&tabs=visual-studio
RicoSuter/NSwag#4524
https://github.com/RicoSuter/NSwag/wiki/NSwag.MSBuild
https://github.com/RicoSuter/NSwag/wiki/NSwag-Configuration-Document

Author: SashenGovender

ASimpleWeatherApi/ASimpleWeatherApi/ASimpleWeatherApi.csproj

@@ -8,7 +8,16 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <PackageReference Include="NSwag.AspNetCore" Version="14.0.7" />
+    <PackageReference Include="NSwag.MSBuild" Version="14.0.7">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
     <PackageReference Include="Swashbuckle.AspNetCore" Version="6.4.0" />
   </ItemGroup>
 
+  <Target Name="NSwag" AfterTargets="PostBuildEvent" Condition=" '$(Configuration)' == 'Debug' ">
+    <Exec WorkingDirectory="$(ProjectDir)" EnvironmentVariables="ASPNETCORE_ENVIRONMENT=Development" Command="$(NSwagExe_Net80) run nswag.json /variables:Configuration=$(Configuration)" />
+  </Target>
+  
 </Project>

ASimpleWeatherApi/ASimpleWeatherApi/Program.cs

@@ -7,11 +7,15 @@
 builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen();
 
+builder.Services.AddOpenApiDocument();
+
 var app = builder.Build();
 
 // Configure the HTTP request pipeline.
 if (app.Environment.IsDevelopment())
 {
+    app.UseOpenApi();
+
     app.UseSwagger();
     app.UseSwaggerUI();
 }

ASimpleWeatherApi/ASimpleWeatherApi/nswag.json

@@ -0,0 +1,125 @@
+{
+  "runtime": "Net80",
+  "defaultVariables": null,
+  "documentGenerator": {
+    "aspNetCoreToOpenApi": {
+      "project": "ASimpleWeatherApi.csproj",
+      "msBuildProjectExtensionsPath": null,
+      "configuration": null,
+      "runtime": null,
+      "targetFramework": null,
+      "noBuild": true,
+      "msBuildOutputPath": null,
+      "verbose": true,
+      "workingDirectory": null,
+      "requireParametersWithoutDefault": false,
+      "apiGroupNames": null,
+      "defaultPropertyNameHandling": "CamelCase",
+      "defaultReferenceTypeNullHandling": "Null",
+      "defaultDictionaryValueReferenceTypeNullHandling": "NotNull",
+      "defaultResponseReferenceTypeNullHandling": "NotNull",
+      "generateOriginalParameterNames": true,
+      "defaultEnumHandling": "Integer",
+      "flattenInheritanceHierarchy": false,
+      "generateKnownTypes": true,
+      "generateEnumMappingDescription": false,
+      "generateXmlObjects": false,
+      "generateAbstractProperties": false,
+      "generateAbstractSchemas": true,
+      "ignoreObsoleteProperties": false,
+      "allowReferencesWithProperties": false,
+      "useXmlDocumentation": true,
+      "resolveExternalXmlDocumentation": true,
+      "excludedTypeNames": [],
+      "serviceHost": ".",
+      "serviceBasePath": null,
+      "serviceSchemes": [],
+      "infoTitle": "My Title",
+      "infoDescription": null,
+      "infoVersion": "1.0.0",
+      "documentTemplate": null,
+      "documentProcessorTypes": [],
+      "operationProcessorTypes": [],
+      "typeNameGeneratorType": null,
+      "schemaNameGeneratorType": null,
+      "contractResolverType": null,
+      "serializerSettingsType": null,
+      "useDocumentProvider": true,
+      "documentName": "v1",
+      "aspNetCoreEnvironment": null,
+      "createWebHostBuilderMethod": null,
+      "startupType": null,
+      "allowNullableBodyParameters": true,
+      "useHttpAttributeNameAsOperationId": false,
+      "output": null,
+      "outputType": "Swagger2",
+      "newLineBehavior": "Auto",
+      "assemblyPaths": [],
+      "assemblyConfig": null,
+      "referencePaths": [],
+      "useNuGetCache": false
+    }
+  },
+  "codeGenerators": {
+    "openApiToTypeScriptClient": {
+      "className": "{controller}Client",
+      "moduleName": "",
+      "namespace": "",
+      "typeScriptVersion": 4.3,
+      "template": "Angular",
+      "promiseType": "Promise",
+      "httpClass": "HttpClient",
+      "withCredentials": false,
+      "useSingletonProvider": true,
+      "injectionTokenType": "InjectionToken",
+      "rxJsVersion": 7.0,
+      "dateTimeType": "Date",
+      "nullValue": "Undefined",
+      "generateClientClasses": true,
+      "generateClientInterfaces": false,
+      "generateOptionalParameters": false,
+      "exportTypes": true,
+      "wrapDtoExceptions": false,
+      "exceptionClass": "ApiException",
+      "clientBaseClass": null,
+      "wrapResponses": false,
+      "wrapResponseMethods": [],
+      "generateResponseClasses": true,
+      "responseClass": "SwaggerResponse",
+      "protectedMethods": [],
+      "configurationClass": null,
+      "useTransformOptionsMethod": false,
+      "useTransformResultMethod": false,
+      "generateDtoTypes": true,
+      "operationGenerationMode": "MultipleClientsFromOperationId",
+      "markOptionalProperties": true,
+      "generateCloneMethod": true,
+      "typeStyle": "Interface",
+      "enumStyle": "Enum",
+      "useLeafType": false,
+      "classTypes": [],
+      "extendedClasses": [],
+      "extensionCode": null,
+      "generateDefaultValues": true,
+      "excludedTypeNames": [],
+      "excludedParameterNames": [],
+      "handleReferences": false,
+      "generateTypeCheckFunctions": false,
+      "generateConstructorInterface": true,
+      "convertConstructorInterfaceData": false,
+      "importRequiredTypes": true,
+      "useGetBaseUrlMethod": false,
+      "baseUrlTokenName": "API_BASE_URL",
+      "queryNullValue": "",
+      "useAbortSignal": false,
+      "inlineNamedDictionaries": false,
+      "inlineNamedAny": false,
+      "includeHttpContext": false,
+      "templateDirectory": null,
+      "serviceHost": null,
+      "serviceSchemes": null,
+      "output": "../../sdk-client.ts",
+      "newLineBehavior": "Auto"
+    }
+  }
+}