Explain Vite dependency pre-bundling, startup speed, and CommonJS handling
This tests whether you understand Vite's ESM-first dev server constraints. Pre-bundling converts CJS/UMD to ESM and collapses multi-file ESM deps into single modules to stop 600+ request waterfalls.
This tests your grasp of Vite's dev server design and its native ESM constraint. A strong answer covers two goals: first, converting CJS and UMD packages to ESM using smart import analysis so named imports work on dynamically assigned exports like React; second, flattening ESM dependencies with hundreds of internal modules into a single file to avoid browser request waterfalls. Mention it only runs in development, uses Rolldown, and auto-discovers bare imports.
Read the original → vite.dev
- #vite
- #dependency-pre-bundling
- #esm
- #commonjs
- #frontend-build-tools
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