Skills · SkillWeb & UIReviewed

vite-patterns

Vite build tool patterns including config, plugins, HMR, env variables, proxy setup, SSR, library mode, dependency pre-bundling, and build optimization. Activate when working with vite.config.ts, Vite plugins, or Vite-based projects.

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Kind: Skill
Works with: Claude Code, Codex
Languages: TypeScript / JavaScript
Source: affaan-m/ECC @ d3b8a3e90890
Path: skills/vite-patterns/SKILL.md
License: MIT

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# Vite Patterns

Build tool and dev server patterns for Vite 8+ projects. Covers configuration, environment variables, proxy setup, library mode, dependency pre-bundling, and common production pitfalls.

## When to Use

- Configuring `vite.config.ts` or `vite.config.js`
- Setting up environment variables or `.env` files
- Configuring dev server proxy for API backends
- Optimizing build output (chunks, minification, assets)
- Publishing libraries with `build.lib`
- Troubleshooting dependency pre-bundling or CJS/ESM interop
- Debugging HMR, dev server, or build errors
- Choosing or ordering Vite plugins

## How It Works

- **Dev mode** serves source files as native ESM — no bundling. Transforms happen on-demand per module request, which is why cold starts are fast and HMR is precise.
- **Build mode** uses Rolldown (v7+) or Rollup (v5–v6) to bundle the app for production with tree-shaking, code-splitting, and Oxc-based minification.
- **Dependency pre-bundling** converts CJS/UMD deps to ESM once via esbuild and caches the result under `node_modules/.vite`, so subsequent starts skip the work.
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