Engineering Reference · Webpack 5 & Vite 5+
JavaScript Bundle Analysis
& Code Splitting Architectures
A production-grade reference for frontend engineers who care about performance. Deep-dive into route-based code splitting, advanced tree-shaking, and build pipeline internals — with quantified metrics and real configuration for both Webpack 5 and Vite 5+.
Modern frontend architectures demand rigorous payload control. Proper code splitting reduces initial JavaScript by 40–65%, improving Time to Interactive by 800–1200ms on mid-tier mobile devices. This reference covers the configuration, debugging, and CI validation workflows that make the difference in production.
Explore the Reference
Three interconnected topic areas — each with section overviews, focused sub-articles, and deep-dive implementation guides.
Dynamic imports, route-level chunk boundaries, prefetch/preload strategies, and vendor chunk isolation — with Webpack 5 and Vite 5+ configurations.
- Dynamic Import Patterns for On-Demand Loading
- Implementing Route-Level Splitting in SPAs
- Prefetch & Preload for Critical Routes
- Vendor Chunk Isolation & Third-Party Management
sideEffects configuration, barrel file elimination, CJS→ESM conversion, and dead-code removal pipelines for production bundles.
- Configuring sideEffects for Optimal Tree-Shaking
- Converting CJS Libraries to ESM
- Eliminating Dead Code with Modern Build Tools
- Refactoring Barrel Files to Reduce Bloat
Webpack & Vite internals, module resolution algorithms, source map workflows, ES Modules vs CommonJS interop, and dev-server optimisation.
- Vite Module Graph & Dependency Resolution
- Webpack Chunk Generation Lifecycle
- Source Map Generation & Debugging Workflows
- ES Modules vs CommonJS in Bundlers