Next.js has optimized package imports, resulting in faster cold boots, faster builds, and improved local development speed. Barrel files, which group and export multiple modules from a single file, can cause slowdowns in importing packages. The new solution, `optimizePackageImports`, automatically maps all imports in barrel files, improving performance without the need for manual configuration. Upgrading to the latest version of Next.js is recommended for significant performance improvements.
Table of contents
What is a barrel file?What's the problem with barrel files?Can’t we tree-shake it?Our first attempt: modularizeImportsNew solution: optimizePackageImportsMeasuring performance improvementsConclusionSort: