cdk.md

Cloud Development Kit

[CDK app]          like a city, definition of your infrastructure using code
 └─[stack]         like a building, CDK Stack == CloudFormation stack, deployment boundary
    ├─[construct]  like a building block, represents cloud component abstraction, e.g. Lambda function
    └─...

Constructs

• can be composed together into higher level abstractions via scopes.
• there's AWS construct Library organized into modules
• constructs are TS/JS classes with the (scope, id, props) signature
• they are like Go packages

bin/cdk-workshop.ts - holds the CDK app:

#!/usr/bin/env node
import * as cdk from 'aws-cdk-lib';
import { CdkWorkshopStack } from '../lib/cdk-workshop-stack';

const app = new cdk.App();
new CdkWorkshopStack(app, 'CdkWorkshopStack');

lib/cdk-workshop-stack.ts - holds the the CdkWorkshopStack stack and the Function construct:

import { Stack, StackProps } from "aws-cdk-lib";
import { Code, Function, Runtime } from "aws-cdk-lib/aws-lambda";
import { Construct } from "constructs";

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

    // defines an AWS Lambda resource
    const hello = new Function(this, "HelloHandler", {
      runtime: Runtime.NODEJS_22_X,     // execution environment
      code: Code.fromAsset("lambda"),   // code loaded from "lambda" directory
      handler: "hello.handler",         // file is "hello", function is "handler"
    });
  }
}

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