vite-plugin-css-injected-by-js

A Vite plugin that injects all CSS into the JavaScript bundle at build time, eliminating separate CSS files and enabling single-file deployments. Current stable version is 5.0.1, requiring Vite >8.0.0-0 (major breaking from v4 which supported Vite 4-7). It provides a virtual module for on-demand injection and supports custom injection targets like Shadow DOM. Key differentiator: unlike Vite's default CSS extraction, it bundles styles into JS, useful for widgets, libraries, or deployments where a single JS file is preferred. Ships TypeScript types. Active development with frequent releases.