https://apoorv.blog/run-lambda-locally-cdk-sam/

index.js

exports.handler = async (event) => {

    console.log(event)

    return {
        statusCode: 200,
        body: JSON.stringify({ message: 'success' })
    }
}

lambda-local-stack.ts

import { Code, Function, Runtime } from '@aws-cdk/aws-lambda';
import * as cdk from '@aws-cdk/core';

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

    // The code that defines your stack goes here

    const oneFn = new Function(this, 'oneFn', {
      runtime: Runtime.NODEJS_14_X,
      code: Code.fromAsset(`${__dirname}/../lambda-fns/one/deployment.zip`),
      handler: 'index.handler'
    })
  }
}

Taskfile.yml

# https://taskfile.dev
version: '3'

tasks:
  default:
    cmds:
      - rm deployment.zip -f
      - zip deployment.zip index.js