Moving CDK example app to latest CDK version

samples/sample-cdk-app/.gitignore

@@ -0,0 +1,3 @@
+cdk.out/
+node_modules/
+package-lock.json

samples/sample-cdk-app/cdk.json

@@ -1,3 +1,3 @@
 {
-    "app": "node index"
+    "app": "npx ts-node --prefer-ts-exts index.ts"
 }

samples/sample-cdk-app/index.ts

@@ -1,24 +1,19 @@
-// Copyright Amazon.com Inc. or its affiliates.
-// SPDX-License-Identifier: Apache-2.0
-
-import events = require('@aws-cdk/aws-events');
-import targets = require('@aws-cdk/aws-events-targets');
-import lambda = require('@aws-cdk/aws-lambda');
-import cdk = require('@aws-cdk/core');
+import { App, Stack, Duration } from 'aws-cdk-lib';
+import { aws_lambda as lambda, aws_events as events, aws_events_targets as targets } from 'aws-cdk-lib';
 
 import fs = require('fs');
 
-export class LambdaCronStack extends cdk.Stack {
-  constructor(app: cdk.App, id: string) {
+export class LambdaCronStack extends Stack {
+  constructor(app: App, id: string) {
     super(app, id);
 
     const lambdaFn = new lambda.Function(this, 'Singleton', {
       code: new lambda.InlineCode(
         fs.readFileSync('handler.py', { encoding: 'utf-8' }),
       ),
       handler: 'index.main',
-      timeout: cdk.Duration.seconds(300),
-      runtime: lambda.Runtime.PYTHON_3_8
+      timeout: Duration.seconds(300),
+      runtime: lambda.Runtime.PYTHON_3_12
     });
     // Run every day at 6PM UTC
     // See https://docs.aws.amazon.com/lambda/latest/dg/tutorial-scheduled-events-schedule-expressions.html
@@ -29,6 +24,6 @@ export class LambdaCronStack extends cdk.Stack {
   }
 }
 
-const app = new cdk.App();
+const app = new App();
 new LambdaCronStack(app, 'LambdaCronExample');
 app.synth();

samples/sample-cdk-app/package.json

@@ -1,6 +1,6 @@
 {
   "name": "lambda-cron",
-  "version": "0.23.0",
+  "version": "0.24.0",
   "description": "Running a Lambda on a schedule",
   "private": true,
   "scripts": {
@@ -15,13 +15,11 @@
   },
   "license": "Apache-2.0",
   "devDependencies": {
-    "@types/node": "^8.10.38",
-    "typescript": "^3.2.4"
+    "@types/node": "^20.0.0",
+    "typescript": "^5.4.4"
   },
   "dependencies": {
-    "@aws-cdk/aws-events": "*",
-    "@aws-cdk/aws-events-targets": "*",
-    "@aws-cdk/aws-lambda": "*",
-    "@aws-cdk/core": "*"
+    "aws-cdk-lib": "^2.135.0",
+    "constructs": "^10.3.0"
   }
 }