Bundling Lambda packages

Always bundle the @aws-sdk/* with your project eventhough the Lambda runtime already includes it by default (Note: nodejs16.x does not have AWS SDK v3 included). This gives you full control of when to update the SDK to prevent unexpected errors from a bad SDK version, allows you to ensure that you are running the latest version with the most up to date fixes and features, and has been shown to decrease cold start times.

Compilers

typescript

npm i -D typescript
node_modules/.bin/tsc

tsconfig.json

{
  "compilerOptions": {
    "baseUrl": "./",
    "esModuleInterop": true,
    "preserveConstEnums": true,
    "strictNullChecks": true,
    "allowJs": false,
    "target": "es2021",
    "typeRoots": ["node_modules/@types"],
    "resolveJsonModule": true,
    "moduleResolution": "node"
  }
}

Bundlers

esbuild

npm i -D esbuild

# --banner:js hack from https://github.com/evanw/esbuild/pull/2067
node_modules/.bin/esbuild index.js 
    --platform=node --format=esm  --target=node18 --bundle --minify 
    --banner:js="import { createRequire } from 'module';const require = createRequire(import.meta.url);" 
    --legal-comments=external --sourcemap=external 
    --allow-overwrite --outfile=index.mjs

rollup

npm i -D rollup @rollup/plugin-node-resolve @rollup/plugin-commonjs
node_modules/.bin/rollup --config

rollup.config.mjs

import { nodeResolve } from '@rollup/plugin-node-resolve'
import commonjs from '@rollup/plugin-commonjs'

const plugins = [nodeResolve({ preferBuiltins: true }), commonjs()]

export default (input) => ({
  input: 'index.js',
  output: {
    file: 'index.bundle.rollup.mjs',
    format: 'es' // cjs, es
  },
  plugins,
  external: [
    // AWS SDK
    '@aws-sdk/client-apigatewaymanagementapi', // @middy/ws-response
    '@aws-sdk/client-rds', // @middy/rds-signer
    '@aws-sdk/client-s3', // @middy/s3-object-response
    '@aws-sdk/client-secretsmanager', // @middy/sercrets-manager
    '@aws-sdk/client-servicediscovery', // @middy/service-discovery
    '@aws-sdk/client-ssm', // @middy/ssm
    '@aws-sdk/client-sts' // @middy/sts
  ]
})

swc/pack

npm i -D @swc/cli @swc/core
node_modules/.bin/spack

webpack

npm i -D webpack-cli webpack
node_modules/.bin/webpack

webpack.config.mjs

import path from 'node:path'
import { fileURLToPath } from 'node:url'

const __filename = fileURLToPath(import.meta.url)
const __dirname = path.dirname(__filename)

export default {
  mode: 'development',
  entry: './index.js',
  output: {
    filename: 'index.bundle.webpack.mjs',
    path: __dirname
  },
  experiments: {
    outputModule: true
  },
  externals: [
    // NodeJS modules
    'events', // @middy/core
    'https', // @middy/s3-object-response
    'stream', // @middy/http-content-encoding @middy/s3-object-response
    'util', // @middy/http-content-encoding
    'zlib', // @middy/http-content-encoding
    // AWS SDK
    '@aws-sdk/client-apigatewaymanagementapi', // @middy/ws-response
    '@aws-sdk/client-rds', // @middy/rds-signer
    '@aws-sdk/client-s3', // @middy/s3-object-response
    '@aws-sdk/client-secretsmanager', // @middy/sercrets-manager
    '@aws-sdk/client-servicediscovery', // @middy/service-discovery
    '@aws-sdk/client-ssm', // @middy/ssm
    '@aws-sdk/client-sts' // @middy/sts
  ]
}

Transpilers

babel

npm i -D @babel/cli @babel/core @babel/preset-env
node_modules/.bin/babel index.js --out-file index.transpile.babel.cjs

babel.config.json

{
  "presets": [
    [
      "@babel/preset-env",
      {
        "targets": {
          "node": "16"
        }
      }
    ]
  ]
}

esbuild

npm i -D esbuild
node_modules/.bin/esbuild --platform=node --target=node16 --format=cjs index.js --outfile=index.cjs

swc

npm i -D @swc/cli @swc/core
node_modules/.bin/swc index.js --out-file index.transpile.swc.cjs

.swcrc

{
  "jsc": {
    "parser": {
      "syntax": "ecmascript"
    },
    "target": "es2021"
  },
  "module": {
    "type": "commonjs"
  }
}