aws-samples · kaiz-io · Apr 5, 2026 · Apr 5, 2026
diff --git a/csharp/CloudFront-S3-WAF/src/src.csproj b/csharp/CloudFront-S3-WAF/src/src.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <LangVersion>latest</LangVersion>

diff --git a/csharp/api-cors-lambda-crud-dynamodb/cdk.json b/csharp/api-cors-lambda-crud-dynamodb/cdk.json
@@ -1,5 +1,5 @@
 {
-  "app": "dotnet run -p src/ApiCorsLambdaCrudDynamodb/ApiCorsLambdaCrudDynamodb.csproj",
+  "app": "dotnet run --project src/ApiCorsLambdaCrudDynamodb/ApiCorsLambdaCrudDynamodb.csproj",
   "watch": {
     "include": [
       "**"

diff --git a/csharp/apigateway-cognito-lambda-dynamodb/src/CDK/cdk.csproj b/csharp/apigateway-cognito-lambda-dynamodb/src/CDK/cdk.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RootNamespace>apigateway_cognito_lambda_dynamodb</RootNamespace>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>

diff --git a/csharp/apigateway-cognito-lambda-dynamodb/src/Lambda/AuthFunction/AuthFunction.csproj b/csharp/apigateway-cognito-lambda-dynamodb/src/Lambda/AuthFunction/AuthFunction.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>

diff --git a/csharp/apigateway-cognito-lambda-dynamodb/src/Lambda/BackendFunction/BackendFunction.csproj b/csharp/apigateway-cognito-lambda-dynamodb/src/Lambda/BackendFunction/BackendFunction.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>

diff --git a/csharp/application-load-balancer/cdk.json b/csharp/application-load-balancer/cdk.json
@@ -1,3 +1,3 @@
 {
-  "app": "dotnet run -p src/ApplicationLoadBalancer/ApplicationLoadBalancer.csproj"
+  "app": "dotnet run --project src/ApplicationLoadBalancer/ApplicationLoadBalancer.csproj"
 }
diff --git a/csharp/application-load-balancer/src/ApplicationLoadBalancer/ApplicationLoadBalancer.csproj b/csharp/application-load-balancer/src/ApplicationLoadBalancer/ApplicationLoadBalancer.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <!-- Roll forward to future major versions of the netcoreapp as needed -->
     <RollForward>Major</RollForward>
   </PropertyGroup>

diff --git a/csharp/appsync-graphql-dynamodb/cdk.json b/csharp/appsync-graphql-dynamodb/cdk.json
@@ -1,3 +1,3 @@
 {
-  "app": "dotnet run -p src/AppsyncGraphqlDynamodb/AppsyncGraphqlDynamodb.csproj"
+  "app": "dotnet run --project src/AppsyncGraphqlDynamodb/AppsyncGraphqlDynamodb.csproj"
 }
diff --git a/csharp/appsync-graphql-dynamodb/src/AppsyncGraphqlDynamodb/AppsyncGraphqlDynamodb.csproj b/csharp/appsync-graphql-dynamodb/src/AppsyncGraphqlDynamodb/AppsyncGraphqlDynamodb.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <!-- Roll forward to future major versions of the netcoreapp as needed -->
     <RollForward>Major</RollForward>
   </PropertyGroup>

diff --git a/...string/CapitalizeStringHandler/src/CapitalizeStringHandler/CapitalizeStringHandler.csproj b/...string/CapitalizeStringHandler/src/CapitalizeStringHandler/CapitalizeStringHandler.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
     <AWSProjectType>Lambda</AWSProjectType>
   </PropertyGroup>

diff --git a/...string/CapitalizeStringHandler/src/CapitalizeStringHandler/aws-lambda-tools-defaults.json b/...string/CapitalizeStringHandler/src/CapitalizeStringHandler/aws-lambda-tools-defaults.json
@@ -11,7 +11,7 @@
   "profile": "",
   "region": "",
   "configuration": "Release",
-  "framework": "net6.0",
+  "framework": "net8.0",
   "function-runtime": "dotnetcore3.1",
   "function-memory-size": 256,
   "function-timeout": 30,

diff --git a/...lizeStringHandler/test/CapitalizeStringHandler.Tests/CapitalizeStringHandler.Tests.csproj b/...lizeStringHandler/test/CapitalizeStringHandler.Tests/CapitalizeStringHandler.Tests.csproj
@@ -1,6 +1,6 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Amazon.Lambda.Core" Version="1.1.0" />

diff --git a/csharp/capitalize-string/cdk.json b/csharp/capitalize-string/cdk.json
@@ -1,3 +1,3 @@
 {
-  "app": "dotnet publish -c Release CapitalizeStringHandler/src/CapitalizeStringHandler; dotnet run -p src/CapitalizeString"
+  "app": "dotnet publish -c Release CapitalizeStringHandler/src/CapitalizeStringHandler; dotnet run --project src/CapitalizeString"
 }
diff --git a/csharp/capitalize-string/src/CapitalizeString/CapitalizeStringStack.cs b/csharp/capitalize-string/src/CapitalizeString/CapitalizeStringStack.cs
@@ -11,7 +11,7 @@ internal CapitalizeStringStack(Construct scope, string id, IStackProps props = n
             Function fn = new Function(this, "capitalizestring", new FunctionProps
             {
                 Runtime = Runtime.DOTNET_8,
-                Code = Code.FromAsset("./CapitalizeStringHandler/src/CapitalizeStringHandler/bin/Release/net6.0/publish"),
+                Code = Code.FromAsset("./CapitalizeStringHandler/src/CapitalizeStringHandler/bin/Release/net8.0/publish"),
                 Handler = "CapitalizeStringHandler::CapitalizeStringHandler.Function::FunctionHandler"
             });
         }

diff --git a/csharp/classic-load-balancer/cdk.json b/csharp/classic-load-balancer/cdk.json
@@ -1,3 +1,3 @@
 {
-  "app": "dotnet run -p src/ClassicLoadBalancer/ClassicLoadBalancer.csproj"
+  "app": "dotnet run --project src/ClassicLoadBalancer/ClassicLoadBalancer.csproj"
 }
diff --git a/csharp/classic-load-balancer/src/ClassicLoadBalancer/ClassicLoadBalancer.csproj b/csharp/classic-load-balancer/src/ClassicLoadBalancer/ClassicLoadBalancer.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <!-- Roll forward to future major versions of the netcoreapp as needed -->
     <RollForward>Major</RollForward>
   </PropertyGroup>

diff --git a/...validate/src/CustomResourceCloudFrontInvalidate/CustomResourceCloudFrontInvalidate.csproj b/...validate/src/CustomResourceCloudFrontInvalidate/CustomResourceCloudFrontInvalidate.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <RollForward>Major</RollForward>
   </PropertyGroup>
 

diff --git a/csharp/ec2-instance-dev-server/src/Ec2InstanceDevServer/Ec2InstanceDevServer.csproj b/csharp/ec2-instance-dev-server/src/Ec2InstanceDevServer/Ec2InstanceDevServer.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <!-- Roll forward to future major versions of the netcoreapp as needed -->
     <RollForward>Major</RollForward>
   </PropertyGroup>

diff --git a/csharp/ec2-instance/src/Ec2Instance/Ec2Instance.csproj b/csharp/ec2-instance/src/Ec2Instance/Ec2Instance.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <!-- Roll forward to future major versions of the netcoreapp as needed -->
     <RollForward>Major</RollForward>
   </PropertyGroup>

diff --git a/csharp/elasticbeanstalk/elasticbeanstalk-bg-pipeline/cdk.json b/csharp/elasticbeanstalk/elasticbeanstalk-bg-pipeline/cdk.json
@@ -1,3 +1,3 @@
 {
-  "app": "dotnet run -p src/ElasticbeanstalkBgPipeline/ElasticbeanstalkBgPipeline.csproj"
+  "app": "dotnet run --project src/ElasticbeanstalkBgPipeline/ElasticbeanstalkBgPipeline.csproj"
 }
diff --git a/...ticbeanstalk-bg-pipeline/src/ElasticbeanstalkBgPipeline/ElasticbeanstalkBgPipeline.csproj b/...ticbeanstalk-bg-pipeline/src/ElasticbeanstalkBgPipeline/ElasticbeanstalkBgPipeline.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <!-- Roll forward to future major versions of the netcoreapp as needed -->
     <RollForward>Major</RollForward>
   </PropertyGroup>

diff --git a/csharp/elasticbeanstalk/elasticbeanstalk-environment/cdk.json b/csharp/elasticbeanstalk/elasticbeanstalk-environment/cdk.json
@@ -2,5 +2,5 @@
   "context": {
     "platform": "arn:aws:elasticbeanstalk:us-east-1::platform/Tomcat 8 with Java 8 running on 64bit Amazon Linux"
   },
-  "app": "dotnet run -p src/ElasticbeanstalkEnvironment"
+  "app": "dotnet run --project src/ElasticbeanstalkEnvironment"
 }
diff --git a/...cbeanstalk-environment/src/ElasticbeanstalkEnvironment/ElasticbeanstalkEnvironment.csproj b/...cbeanstalk-environment/src/ElasticbeanstalkEnvironment/ElasticbeanstalkEnvironment.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <!-- Roll forward to future major versions of the netcoreapp as needed -->
     <RollForward>Major</RollForward>
   </PropertyGroup>

diff --git a/csharp/eventbridge-firehose-s3-cdk/src/src.csproj b/csharp/eventbridge-firehose-s3-cdk/src/src.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <LangVersion>latest</LangVersion>

diff --git a/csharp/lambda-cron/cdk.json b/csharp/lambda-cron/cdk.json
@@ -1,5 +1,5 @@
 {
-  "app": "dotnet run -p src/LambdaCron/LambdaCron.csproj",
+  "app": "dotnet run --project src/LambdaCron/LambdaCron.csproj",
   "context": {
     "@aws-cdk/aws-apigateway:usagePlanKeyOrderInsensitiveId": true,
     "@aws-cdk/core:enableStackNameDuplicates": "true",

diff --git a/csharp/lambda-cron/src/LambdaCron.Tests/LambdaCron.Tests.csproj b/csharp/lambda-cron/src/LambdaCron.Tests/LambdaCron.Tests.csproj
@@ -1,7 +1,7 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
 
     <IsPackable>false</IsPackable>
   </PropertyGroup>

diff --git a/csharp/lambda-cron/src/LambdaCron/LambdaCron.csproj b/csharp/lambda-cron/src/LambdaCron/LambdaCron.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <!-- Roll forward to future major versions of the netcoreapp as needed -->
     <RollForward>Major</RollForward>
   </PropertyGroup>

diff --git a/csharp/my-widget-service/cdk.json b/csharp/my-widget-service/cdk.json
@@ -1,3 +1,3 @@
 {
-  "app": "dotnet src/MyWidgetService/bin/Debug/net6.0/MyWidgetService.dll"
+  "app": "dotnet src/MyWidgetService/bin/Debug/net8.0/MyWidgetService.dll"
 }
diff --git a/csharp/my-widget-service/src/MyWidgetService/MyWidgetService.csproj b/csharp/my-widget-service/src/MyWidgetService/MyWidgetService.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <!-- Roll forward to future major versions of the netcoreapp as needed -->
     <RollForward>Major</RollForward>
   </PropertyGroup>

diff --git a/csharp/random-writer/src/RandomWriter/RandomWriter.csproj b/csharp/random-writer/src/RandomWriter/RandomWriter.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <!-- Roll forward to future major versions of the netcoreapp as needed -->
     <RollForward>Major</RollForward>
   </PropertyGroup>

diff --git a/csharp/static-site/cdk.json b/csharp/static-site/cdk.json
@@ -3,5 +3,5 @@
      "domain": "mystaticsite.com",
      "subdomain": "www"
   },
-  "app": "dotnet run -p src/StaticSite/StaticSite.csproj"
+  "app": "dotnet run --project src/StaticSite/StaticSite.csproj"
 }
diff --git a/csharp/static-site/src/StaticSite/StaticSite.csproj b/csharp/static-site/src/StaticSite/StaticSite.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <!-- Roll forward to future major versions of the netcoreapp as needed -->
     <RollForward>Major</RollForward>
   </PropertyGroup>

diff --git a/csharp/stepfunctions-job-poller/cdk.json b/csharp/stepfunctions-job-poller/cdk.json
@@ -1,3 +1,3 @@
 {
-  "app": "dotnet run -p src/StepfunctionsJobPoller/StepfunctionsJobPoller.csproj"
+  "app": "dotnet run --project src/StepfunctionsJobPoller/StepfunctionsJobPoller.csproj"
 }
diff --git a/csharp/stepfunctions-job-poller/src/StepfunctionsJobPoller/StepfunctionsJobPoller.csproj b/csharp/stepfunctions-job-poller/src/StepfunctionsJobPoller/StepfunctionsJobPoller.csproj
@@ -2,7 +2,7 @@
 
   <PropertyGroup>
     <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
+    <TargetFramework>net8.0</TargetFramework>
     <!-- Roll forward to future major versions of the netcoreapp as needed -->
     <RollForward>Major</RollForward>
   </PropertyGroup>

diff --git a/go/httpapi-lambda/httpapi-lambda_test.go b/go/httpapi-lambda/httpapi-lambda_test.go
@@ -16,7 +16,7 @@ func TestHttpapiLambdaStack(t *testing.T) {
 	stack := NewHttpapiLambdaStack(app, "MyStack", nil)
 
 	// THEN
-	template := assertions.Template_FromStack(stack)
+	template := assertions.Template_FromStack(stack, nil)
 
 	template.HasResourceProperties(jsii.String("AWS::ApiGatewayV2::Api"), map[string]interface{}{})
 

diff --git a/scripts/build-toolkit/.gitignore b/scripts/build-toolkit/.gitignore
@@ -0,0 +1,4 @@
+node_modules
+dist
+package-lock.json
+*.js.map
diff --git a/scripts/build-toolkit/README.md b/scripts/build-toolkit/README.md
@@ -0,0 +1,113 @@
+# build-toolkit
+
+TypeScript build runner for all CDK example projects using the [@aws-cdk/toolkit-lib](https://www.npmjs.com/package/@aws-cdk/toolkit-lib) for programmatic synthesis. Replaces the bash-based `build-*.sh` scripts with structured output and message capture.
+
+## Supported Languages
+
+- **TypeScript** - npm/yarn install → tsc build → jest test → synth
+- **Python** - pip install in venv → synth (venv cleaned up after)
+- **Java** - mvn compile → mvn test → synth
+- **Go** - go build → go test → synth
+- **C#/.NET** - dotnet build → synth
+
+## What it does
+
+For each CDK project discovered under the target directory:
+
+1. Detects the language from project markers (package.json, requirements.txt, pom.xml, go.mod, *.csproj)
+2. Runs the language-appropriate build pipeline
+3. Runs programmatic `cdk synth` via `@aws-cdk/toolkit-lib` with a custom `IIoHost` that captures all warnings, deprecations, and errors
+4. Projects with a `DO_NOT_AUTOTEST` file are skipped
+
+## Usage
+
+```bash
+cd scripts/build-toolkit
+npm install
+
+# Build ALL languages from repo root
+npx tsx src/index.ts ../..
+
+# Build only one language
+npx tsx src/index.ts ../.. --language typescript
+npx tsx src/index.ts ../.. --language python
+
+# With JSON report and custom concurrency
+npx tsx src/index.ts ../.. --concurrency 4 --output /tmp/build-report.json
+
+# Or point at a specific language directory
+npx tsx src/index.ts ../../typescript
+```
+
+## CLI Options
+
+| Option | Description | Default |
+|--------|-------------|---------|
+| `<dir>` | Root directory to scan for CDK projects (required) | - |
+| `--language <lang>` | Filter to one language: typescript, python, java, go, csharp | _(all)_ |
+| `--concurrency N` | Max parallel builds | `os.cpus().length / 2` |
+| `--output <path>` | Write JSON report to file | _(none, console only)_ |
+
+## Output
+
+### Console
+
+Live progress with emoji status per project as they complete:
+
+```
+Found 240 projects (230 buildable, 10 skipped)
+Languages: typescript: 88, python: 78, java: 31, go: 25, csharp: 18
+Concurrency: 8
+
+⏭️  typescript/static-site (DO_NOT_AUTOTEST)
+✅ python/lambda-cron
+✅ typescript/lambda-cron
+✅ go/lambda-cron
+✅ typescript/ecs/cluster (1 warning)
+❌ java/broken-project (build failed)
+
+==============================
+BUILD SUMMARY
+==============================
+Total: 240 (✅ 225 succeeded, ❌ 5 failed, ⏭️  10 skipped)
+Duration: 342.1s
+
+--- Warnings ---
+⚠️  [warn at /MyFirstEcsCluster/MyFleet] desiredCapacity has been configured...
+   in: typescript/ecs/cluster
+```
+
+### JSON Report
+
+When `--output` is specified, writes a structured report with per-project steps, messages, timings, and language metadata.
+
+## How synth works
+
+Instead of shelling out to `cdk synth`, this tool uses the CDK Toolkit Library programmatically:
+
+1. Reads the `app` command from each project's `cdk.json`
+2. For Python projects, prepends venv activation to the app command
+3. Creates a `Toolkit` instance with a custom `IIoHost` that collects all messages
+4. Calls `toolkit.fromCdkApp(appCommand)` then `toolkit.synth(source)`
+5. Copies `scripts/fake.context.json` when no `cdk.context.json` exists
+
+The `IIoHost` captures messages at all levels (trace, debug, info, warn, error, result).
+
+## Project structure
+
+```
+scripts/build-toolkit/
+  src/
+    index.ts          # CLI entry point, arg parsing
+    types.ts          # TypeScript interfaces (Language, StepResult, etc.)
+    discover.ts       # Find CDK projects, detect language, skip flags
+    runner.ts         # Spawn child processes with timeout/capture
+    build.ts          # Language-specific build pipelines
+    synth.ts          # @aws-cdk/toolkit-lib synth with IIoHost
+    orchestrator.ts   # Parallel execution with p-limit
+    report.ts         # JSON report + console summary
+```
+
+## Exit code
+
+Exits `1` if any project fails, `0` if all succeed (skipped projects don't count as failures).