Write your first stack

Every construct you'll ever write in CDK — a bucket, a table, a function, all of it — takes the same three arguments.

scope, id, and props

export class FirstStack extends Construct {
  constructor(scope: Construct, id: string) {
    super(scope, id);
    // resources go here
  }
}

• scope — the parent construct this one lives inside. Every resource in a CDK app sits somewhere in a tree; scope is that resource's position in it.
• id — a name unique within scope, used to tell resources apart and to derive the logical IDs CloudFormation actually uses.
• super(scope, id) — calls the parent class's constructor, wiring your construct into that tree before you add anything to it.

Every resource you create inside — new Bucket(this, 'MyFirstBucket', ...) — follows the exact same shape: this as the scope, a string id, then whatever properties that resource needs.

Your task

Add a single S3 bucket, MyFirstBucket, with versioning turned on.

new Bucket(this, 'MyFirstBucket', {
  versioned: true,
});

Run the synthesizer and you'll see this exact construct turn into a real AWS::S3::Bucket resource in the CloudFormation output — the same translation that happens whether you deploy it from CloudSynth's sandbox or, in the next lesson, from your own machine.