Build code for inline CloudFormation Lambda functions (can be used with CDK)

lambda.js

function zipFile(lambdaFile) {
  return esbuild.buildSync({
    entryPoints: [`lambda/${lambdaFile}`], // your path might be different
    external: ['@aws-sdk/*'],
    target: ['node18'],
    platform: 'node',
    bundle: true,
    write: false,
    treeShaking: true
  }).outputFiles[0].text;
}