nextjs-tree-shaking

To optimize Next.js 15 bundle size, you convert default exports to named exports and refactor barrel files to use explicit named re-exports, which enhances static analysis and tree-shaking. This reduces the amount of unused code shipped to the client.

Configuring optimizePackageImports in next.config.mjs enables granular bundling optimization for App Router server components. By updating this configuration, you allow the Next.js compiler to perform more efficient tree-shaking on complex component libraries.

Refactoring barrel files improves tree-shaking because explicit named re-exports provide better static analysis targets. When index.ts files avoid default re-exports, bundlers can accurately identify and eliminate unused module exports from the final bundle.

Yes, you can use the experimental 'use cache' directive in Next.js 15 for function-level caching. This approach improves caching and Hot Module Replacement (HMR) performance within your App Router components and complex libraries.

The best way to audit tree-shaking issues is to run a static analysis tool like @silverassist/performance-toolkit with the --audit-exports flag. This identifies default export hotspots in your component libraries, guiding your named export migration.

Yes, this migration approach specifically targets Next.js 15 apps using App Router, server components, and complex component libraries. Converting default exports to named exports and updating barrel files ensures large libraries are bundled efficiently.