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Vercel logoVercel · Feature trail

Package Import Optimization

1 post · Oct 2023

What this trail covers

Vercel's Next.js has introduced `optimizePackageImports` to automatically optimize package imports, addressing performance issues caused by barrel files. This feature analyzes package entry points to directly import modules, bypassing the overhead of barrel files. It offers significant improvements in local development speed, production build times, and faster cold starts in serverless environments. The system also handles recursive barrel files and is pre-configured for common libraries, with potential for automatic opt-in in the future.

All Vercel trails
  1. How we optimized package imports in Next.jsIntroduced `optimizePackageImports` as a new experimental option in Next.js 13.5 to automatically optimize package imports by analyzing barrel files and mapping imports to direct module paths. This replaces the manual `modularizeImports` configuration and offers significant performance improvements in local development speed, production build times, and faster cold starts. The feature handles recursive barrel files and wildcard exports, and is pre-configured for common libraries.