Next-generation ES module bundler
Rollup is next-generation ES module bundler. Licensed under MIT, it is extremely popular in the JavaScript ecosystem with 92.4M weekly downloads.
Rollup has an excellent overall health score of 85/100. Its strongest dimension is maintenance (100/100), while quality (50/100) is the area with most room for improvement. This package is well-maintained and actively used.
Complete guide to npm package size optimization in 2026: tree shaking with ESM, sideEffects field, bundle analysis tools, size-limit CI checks, and eliminating moment.js-style bloat.
2026-03-29T00:00:00.000ZThe CJS to ESM migration in the npm ecosystem in 2026. Which major packages went ESM-only, common migration issues, and how to handle CJS/ESM interop in your.
2026-03-08T00:00:00.000ZVite uses Rollup under the hood for production builds. So when should you use Rollup directly instead of Vite? Compare their use cases, configuration, and tree-shaking in 2026.
2026-03-08T00:00:00.000Z