サーバーレス構成（API GW + Lambda + DynamoDB）

import * as cdk from "aws-cdk-lib";
import { Construct } from "constructs";
import * as lambda from "aws-cdk-lib/aws-lambda";
import * as apigw from "aws-cdk-lib/aws-apigateway";
import * as dynamodb from "aws-cdk-lib/aws-dynamodb";

export class ServerlessApigwLambdaDynamodbStack extends cdk.Stack {
  constructor(scope: Construct, id: string, props?: cdk.StackProps) {
    super(scope, id, props);

    const table = new dynamodb.Table(this, "Table", {
      partitionKey: { name: "pk", type: dynamodb.AttributeType.STRING },
      sortKey: { name: "sk", type: dynamodb.AttributeType.STRING },
      billingMode: dynamodb.BillingMode.PAY_PER_REQUEST,
      encryption: dynamodb.TableEncryption.AWS_MANAGED,
    });

    const handler = new lambda.Function(this, "Handler", {
      runtime: lambda.Runtime.NODEJS_20_X,
      handler: "index.handler",
      code: lambda.Code.fromInline("exports.handler = async () => ({ statusCode: 200, body: 'ok' });"),
      environment: { TABLE_NAME: table.tableName },
    });

    table.grantReadWriteData(handler);
    new apigw.LambdaRestApi(this, "Api", { handler });
  }
}