lbundle

Small zero-configuration bundler build on top of Rollup.js and SWC for NPM libraries

🚀 Motivation

There is always this repeated pattern for creating a library while following best practices that you need to maintain across all of your libraries, but then I thought maybe creating a library for bundling libraries is a good idea.

💾 install

NPM registry

# npm
npm i -D lbundle

# yarn
yarn add -D lbundle

# pnpm
pnpm i -D lbundle

# bun
bun i -D lbundle

JSR registry

# deno
deno add -D @mrii/lbundle

# jsr
npx jsr add -D @mrii/lbundle

🔧 Usage

package.json

This bundler heavily relay on your package.json best practices.

{
  "source": "./src/index.ts", // your source code entry
  "main": "./dist/index.js", // cjs entry
  "module": "./dist/index.mjs", // esm entry

  "types": "./dist/index.d.ts", // declaration entry

  "unpkg": "./dist/index.umd.js", // umd entry
  // "unpkg": "./dist/index.amd.js", // or as amd
  // "unpkg": "./dist/index.iife.js", // or as iife

  "bin:source": "./src/cli.ts", // your source code bin entry
  "bin": "./dist/cli.js", // bin entry

  "sideEffects": false, // enable tree shaking for your library code, also useful for users bundlers

  // the bundler will check for for different extension to bundle different formats
  "exports": {
    ".": {
      "default": "./dist/index.js",
      "node": "./dist/index.js",
      "require": "./dist/index.js",
      "import": "./dist/index.mjs",
      "types": "./dist/index.d.ts"
    },
    "./index.css": "./dist/index.css",
    "./package.json": "./package.json"
  }
}

CLI

Just call lbundle binary

lbundle

And That's it, it will generate the bundle for you at the target directory.

✨ Features

• 🤩 all in 1: supports bundling your library and binary into all known formats (esm, cjs, umd, amd and iife), and generate declarations files as well.
• 🚀 fast: it uses rust to compile source code into target env.
• 🍙 bun: can be used with bunx --bun lbundle to speed up the bundling even more.
• 🌲 tree shaking: it will preserve your file structure (for cjs and esm formats) so bundlers can exclude unused code easily.
• 🎮 typescript: it supports bundling typescript code out of the box (make sure have typescript installed).
• 🎯 JSX: supports JSX transformation out of the box (make sure have react and react-dom installed).
• 💅 styles: it support all kind of style files:
  • css, pcss, sss: out of the box.
  • scss, sass: just install sass.
  • less: just install less.
  • styl, stylus: just install stylus.
• 🍇 CSS modules: all styles files support CSS modules by just appending .module. before the file extension.
• 🗺️ path alias: supports TS path and baseUrl transformation.
• 📤 auto externals: look for your dependencies and peerDependencies and exclude them from the bundle.
• 🪛 json: supports importing json files in your code.
• 📦 polyfills: supports adding polyfills to the bundle if you're using latest ES features (make sure to have core-js installed)

🛣️ Roadmap

• bundling into UMD and AMD formats.
• reading exports field and generate extra output according to it.
• vue jsx transformation.
• extending SWC and Rollup config.
• useful logs.
• schema validation and useful errors.
• bundle info.
• watch mode.
• more options.
  • single entry instead of preserved modules.
  • JSX transformation options.
  • ...
• tests (partially done).
• CI.
• changelog.
• contributors.

🧰 API

// esm
import { lbundle } from 'lbundle';

// cjs
const { lbundle } = require('lbundle');

// deno
import { lbundle } from '@mrii/lbundle';

await lbundle({
  /* options */
});

🔍 Options