Landa

A super simple bundler for nodeJS. Based on rollup. Specially well suited for Lambda. Strong typescript support.

Why?

There is many tools to build nodeJS, but most need either excessiv configuration (webpack/rollup/..) or try solve many problems (serverless). If you'd just like to bundle your typescript so some other tool may deploy it to lambda (e.g. via aws-cdk), Landa is a solid choice.

Features

• Typescript transpilation, with or without typechecking enabled
• Dev Server with automatic reloading on changes
• Production builds including dependency installation
• Invocation with pre-defined request data

Table of Contents

• Installation
• Commands
  • Build
  • Serve
  • Invoke
• Configuration Options
• Frameworks
• Dependency Handling
• Deploying

Installation

yarn install landa
# or: npm install landa

Commands

These are some example scripts that you can add to package.json.

{
  // Build for production
  "build": "landa build",
  // Serve dev build
  "dev": "landa serve --dev",
  // Invoke dev build
  "invoke": "landa invoke --dev"
}

Build

Landa builds your code using rollup, babel and typescript. Terser is run for production builds, sourcemaps are always generated.

Serve

Landa contains a fastify based dev server, that will redirect http requests on a given port (4004 by default) to your code, while reloading if your code changes.

Invocation

Invocation allows you to define different requests by name and invoke your code with any of those requests easily, while the output is written to a json file.

Invocation configuration

Add an invocation config to your project, e.g. into invoke.js (or invoke.json) in your root directory.

module.exports = {
  helloWorld: {
    // Request path
    path: '/hello-world',
    // Optional body
    body: {
      hello: 'world',
    },
    // Optional headers
    headers: {
      Authorization: 'Bearer ...',
    },
    // Optional method, default is GET
    httpMethod: 'POST',
    // Optional querystring parameters
    queryStringParameters: {
      id: '123',
    },
  },
};

You can call the helloWorld invocation by:

yarn run invoke helloWorld
# or: npm run invoke helloWorld

Configuration Options

Add optional configuration options to your package.json > landa

// package.json
{
  "landa": {
    // Path to a js script thats run before anything, e.g. to setup env
    "preload": "./index.js",
    // Environment variables, especially for dev server
    "env": { "DB_URI": "http://localhost:8081" },
    // Dev server port
    "servePort": 4004,
    // Enable type-checking (disabled by default!), can be set to "ts2" for `rollup-plugin-typescript2` instead of `@rollup/plugin-typescript`
    "typeCheck": true,
    // Outdir for production builds
    "outDir": "./lib/prod",
    // Outdir for dev builds
    "devDir": "./lib/dev",
    // Path to a js/json file that exports invocation config
    "invokeConfigPath": "./invoke.js",
    // Folder that invocation output is written to
    "invokeOutDir": "./out",
    // Entry, default is any of "./src/index.ts" / "./src/index.js" / "./index.ts" / "./index.js"
    "entryFile": "./src/index.ts"
  }
}

Frameworks

Landa supports most libraries that run on AWS lambda / nodeJS. These frameworks where specifically tested:

• Middy
• NestJS

Dependency Handling

Make sure to add all critical dependencies to your package.json > dependencies. devDependencies will be ignored for production builds.

Deploying

Landa does not do any deployment. Instead, you can zip the output folder yourself, or use aws-cdk.

License

MIT