cdk-simple-lambda.ts

const fn = new lambda.NodejsFunction(this, 'MyFunction', {
  entry: fileURLToPath(new URL('./handler.ts', import.meta.url)),
  functionName: `my-function`,
  bundling: {
    minify: true, // minify code, defaults to false
    sourceMap: true, // include source map, defaults to false
    sourceMapMode: lambda.SourceMapMode.INLINE, // defaults to SourceMapMode.DEFAULT
    target: 'esnext',
    define: {
      'import.meta.vitest': 'undefined',
      'process.env.NODE_ENV': JSON.stringify('production'),
    },
    tsconfig: fileURLToPath(new URL('./tsconfig.json', import.meta.url)),
    format: lambda.OutputFormat.ESM,
  },
  runtime: Runtime.NODEJS_16_X,
})

handler.ts

import type { APIGatewayProxyHandlerV2 } from 'aws-lambda'

export const handler: APIGatewayProxyHandlerV2 = async (event) => {
  console.log('EVENT:', JSON.stringify(event))
  return {
    statusCode: 200,
    body: JSON.stringify({
      message: 'Hello World',
    }),
  }
}

tsconfig.json

{
  "$schema": "https://json.schemastore.org/tsconfig",
  "display": "Default",
  "compilerOptions": {
    "composite": false,
    "declaration": true,
    "declarationMap": true,
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    "inlineSources": false,
    "isolatedModules": true,
    "module": "esnext",
    "moduleResolution": "node",
    "noUnusedLocals": false,
    "noUnusedParameters": false,
    "preserveWatchOutput": true,
    "skipLibCheck": true,
    "strict": true,
    "target": "esnext",
    "sourceMap": false,
    "inlineSourceMap": true
  },
  "exclude": ["node_modules"]
}