Vite 7 build configuration for TYPO3 v13 and v14 LTS sitepackage development with praetorius/vite-asset-collector. Current gold standard: v14.3 LTS (released 2026-04-21).
v14 context: TYPO3 v14.0 removed the core's built-in frontend CSS/JS concatenation and compression (Breaking #108055) and CSS comment/whitespace stripping (Breaking #107944).
config.concatenateCss/compressCss/concatenateJs/compressJsno longer have any effect. An external build tool (Vite / webpack / esbuild) is required for production-grade asset handling on v14.
Key Concepts
Entrypoint-per-CE Pattern
Each content element gets its own Vite entrypoint (*.entry.ts) that imports its SCSS and TypeScript. This enables automatic code splitting -- only the CSS/JS needed for visible content elements is loaded.
Selective Bootstrap Imports
Never import Bootstrap as a whole. Import only the components you use (bootstrap/scss/grid, bootstrap/scss/buttons, etc.) to minimize CSS bundle size.
SVG Optimization
Custom SvgCopyOptimizePlugin processes SVGs from Resources/Private/Svg/ through SVGO and writes optimized files to Resources/Public/Svg/. Supports dev-mode file watching.
CSP Compliance
Assets loaded via <vite:asset> ViewHelper automatically get nonce attributes for Content Security Policy compliance. No inline <script> or <style> tags needed.
Dev Server allowedHosts Trap
Vite enforces host-header checks by default: without allowedHosts: true and cors: true in the server: block, the dev server returns HTTP 403 "Blocked request" for any host header other than localhost -- breaking HMR behind a reverse proxy (Traefik, nginx). This has been the default since the GHSA-vg6x-rcgg-rjx6 fix (4.5.6/5.4.12/6.0.9) -- every Vite 7.x/8.x release enforces it, there's no pre-fix version to worry about on this stack. Set both options inside the single existing server: block -- a second server: { ... } literal silently overwrites the first's keys (including allowedHosts) without warning. See references/vite-configuration.md.
Technology Stack
| Layer | Technology |
|---|---|
| Build | Vite 7+ with praetorius/vite-asset-collector |
| CSS | Bootstrap 5.3+ (selective imports, custom theming) |
| PostCSS | autoprefixer + cssnano (production) |
| SCSS | Modern Compiler API (api: 'modern-compiler') |
| SVG | Custom SVGO plugin (SvgCopyOptimizePlugin) |
| Compression | Gzip + Brotli (production) |
| Package Manager | npm, pnpm, or yarn |
References
references/vite-configuration.md-- Complete vite.config.ts, entrypoints, SVG plugin, CSPreferences/scss-architecture.md-- SCSS folder structure, import chain, naming conventions, CSS unitsreferences/bootstrap-theming.md-- SCSS theming flow, CI-color mapping, selective Bootstrap imports
Credits & Attribution
This skill is based on the excellent work by Netresearch DTT GmbH.
Original repository: https://github.com/netresearch/typo3-vite-skill
Copyright (c) Netresearch DTT GmbH — Methodology and best practices (MIT / CC-BY-SA-4.0)
Special thanks to Netresearch DTT GmbH for their generous open-source contributions to the TYPO3 community, which helped shape this skill collection. Adapted by webconsulting.at for this skill collection