How it works

• Point it to a js/ts file containing your lambda handler(s)
• lambda-build will bundle your code (including node_modules) using esbuild, and create a zip file
• It can also upload the zip file to aws for you, all in a single command

Install

npm i --save-dev lambda-build

• or globally:

npm i --g lambda-build

• see options:

npx lambda-build --help

CLI Usage

• if your handler is called index.js|ts, you can generate a local archive.zip by running:

npx lambda-build

• use upload to create a bundle and upload it to aws
• use archive to create a bundle and save it as a local archive.zip file

lambda-build archive

npx lambda-build archive bundles your code and creates a local archive.zip file that you can then upload to aws yourself.

• using -e, set a custom entry file:

npx lambda-build archive -e src/index.ts

• using -x, exclude some libraries from bundling (for example, if you already load them in a layer):

npx lambda-build archive -e src/index.ts -x lodash dayjs

• using -m, generate a meta.json file which you can then use to analyze your bundle:

npx lambda-build archive -e src/index.ts -m

lambda-build upload

npx lambda-build upload bundles your code and then uploads it directly to your AWS lambda functions (requires the aws cli to be locally configured).

• specify the lambda functions that you would like to deploy to:

npx lambda-build upload my-lambda1 my-lambda2 -e src/index.ts

• you can specify the region using the -r flag (otherwise it defaults to us-east-1):

npx lambda-build upload my-lambda1 my-lambda2 -e src/index.ts -r us-east-2

Library Usage

build()

import { build } from 'lambda-build';

const res = await build({
  entry: 'src/index.js',
  external: ['lodash', 'dayjs'],
  metafile: true,
});

• returns a res object:
  • res.archive - Buffer - contents of the zip archive
  • res.archiveSize - string - the size of the archive
  • res.meta - string - contents of the meta file

buildAndUpload()

import { buildAndUpload } from 'lambda-build';

const res = await buildAndUpload({
  entry: 'src/index.js',
  external: ['lodash', 'dayjs'],
  metafile: true,
  lambdas: ['my-lambda1', 'my-lambda2'],
  region: 'us-east-2',
});

• returns a res object:
  • res.archive - Buffer - contents of the zip archive
  • res.archiveSize - string - the size of the archive
  • res.meta - string - contents of the meta file
  • updatedArns - string[] - an array with the ARNs of the lambda functions that were successfully deployed

Screencast

More Lambda Screencasts

• How to deploy a lambda function using versioning and aliases + API Gateway
• How to install npm modules in AWS Lambda?
• How to deploy a lambda function using github actions?
• How to use layers with Lambda functions?
• How to connect AWS Lambda to a MySQL database to update it? (using RDS proxy)
• How to use environment variables with a Lambda function? (and how to encrypt them with KMS)
• How to use ImageMagick with a Lambda function on AWS?
• How to pass a url query string or a route parameter to AWS Lambda from API Gateway?
• How to build a chat using Lambda + WebSocket + API Gateway? (nodejs)
• What is an AWS lambda function?
• How to restrict access to a static S3 site using HTTP Basic Auth?
• AWS Lambda intro - versions, aliases, concurrency, triggers, logs and monitoring

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