2-outputs.ts

private static createAccessKeyOutputs(scope: cdk.Construct, accessKey: iam.CfnAccessKey) {
    new cdk.CfnOutput(scope, 'UserAccessKeyId', {
        value: accessKey.ref
    });
    new cdk.CfnOutput(scope, 'UserSecretAccessKey', {
        value: accessKey.attrSecretAccessKey
    });
}

private static createS3BucketOutputs(scope: cdk.Construct, s3Bucket: s3.Bucket) {
    const name = 'BucketName';

    new cdk.CfnOutput(scope, name, {
        value: s3Bucket.bucketName
    });
}