bup

5.0.1 verified Mon Apr 27 auth: no javascript maintenance

bup is a build tool that provides automated rollup bundling based on a project's Babel configuration. It reads the `main` field from `package.json` and compiles it into multiple formats (e.g., CJS, ESM, UMD) in a `dist/` directory. Current stable version is 5.0.1, released in 2019 with no active development. Similar to microbundle or rollup-starter-lib but with less configuration.

Warnings

gotcha bup 5.x requires @rollup/plugin-babel as a peer dependency ↓

fix npm install --save-dev @rollup/plugin-babel

gotcha bup's output is based on filename, using the 'name' field from package.json ↓

fix Ensure package.json has a valid 'name' field

deprecated No updates since 2019, consider using rollup-starter-lib ↓

fix Migrate to a maintained tool

Install

npm install bup

yarn add bup

pnpm add bup

Imports

bup
```
npx bup
```
CLI only, no programmatic API

Quickstart

Demonstrates minimal setup for bup: create a simple library and build it.

mkdir my-lib && cd my-lib
npm init -y
npm install --save-dev bup
mkdir src
echo "export default () => 'hello'" > src/index.js
# ensure package.json has "main": "src/index.js"
npx bup
# output: dist/my-lib.cjs.js, dist/my-lib.esm.js