Replacements for tsup

The tsup README says the project is no longer actively maintained and recommends tsdown instead.

tsdown

tsdown is the successor recommended by tsup's own README. The project is effectively in maintenance mode. tsdown is built on Rolldown and is typically faster for library builds, with a largely drop-in config surface.

Config migration

Most tsup.config.ts files map 1:1 to tsdown.config.ts:

import { defineConfig } from 'tsup'
import { defineConfig } from 'tsdown'

export default defineConfig({
  entry: ['src/index.ts'],
  format: ['esm', 'cjs'],
  dts: true,
  clean: true
})

Package scripts

{
  "scripts": {
    "build": "tsup"
    "build": "tsdown"
  }
}

Automated migration

• npx tsdown-migrate
• npx skills add rolldown/tsdown --skill tsdown-migrate