Rollup vs esbuild: Which Bundler for CI Builds?
esbuild is faster; Rollup produces highly-optimized output with a richer plugin ecosystem - and Vite uses both.
Rollup is a mature bundler favored for libraries and tree-shaken output. esbuild is a Go-based bundler prized for raw speed. Notably, Vite uses esbuild in dev and Rollup for production builds.
| Rollup | esbuild | |
|---|---|---|
| Speed | Slower | Much faster |
| Output optimization | Excellent (tree-shaking) | Very good, fewer knobs |
| Plugin ecosystem | Large, mature | Smaller |
| Best for | Libraries, fine-tuned output | Apps, speed-critical builds |
| Config complexity | Higher | Lower |
In CI
esbuild minimizes build time, which is ideal when you bundle frequently and want the shortest pipeline. Rollup is the choice when output quality, code-splitting nuance, or a specific plugin matters - especially for publishing libraries. Many teams get both via Vite (esbuild dev, Rollup prod) without choosing directly.
Practical choice
Building an app where speed dominates: esbuild. Publishing a library or needing precise, well-optimized bundles and mature plugins: Rollup. If you use Vite, you already lean on both.
The verdict
Speed-first app bundling: esbuild. Library output and plugin maturity: Rollup. For many teams, Vite’s esbuild-plus-Rollup split removes the need to pick.