If you are using only L1 constructs in your application, then DynamoDB tables Level 1 construct (CfnTable), does not natively support auto-scaling for local table, so how does one implement the Autoscaling for provisioned read/writes ? 

Note: CfnTable does however support Autoscaling for the Global Tables in CloudFormation templates

To understand the root cause, this is because the Level 1 construct CfnTable maps directly to the CloudFormation resource AWS::DynamoDB::Table and you can only define the resource's properties when using the Level 1 construct.

DynamoDB uses Application Autoscaling to automatically scale the table's capacity .  Thus, you would need to use the CfnScalableTarget & CfnScalingPolicy constructs of application autoscaling resource to enable autoscaling on DynamoDB.

This sample repo shows implementation using AWS CDK Application Auto Scaling L1 construct library for a DynamoDb resource.

For more details, refer to the Blog Post.

The cdk.json file tells the CDK Toolkit how to execute your app.

• npm run build compile typescript to js
• npm run watch watch for changes and compile
• npm run test perform the jest unit tests
• npx cdk deploy deploy this stack to your default AWS account/region
• npx cdk diff compare deployed stack with current state
• npx cdk synth emits the synthesized CloudFormation template