Use when configuring Vite 7 for TYPO3 v13/v14 LTS projects, setting up SCSS architecture with Bootstrap 5.3 theming, creating entrypoints per content element, optimizing SVGs, configuring PostCSS (autoprefixer, cssnano), loading local fonts, or customizing Bootstrap variables. v14 removed core asset concat/compression (#108055) — external build tool is now mandatory.
Also triggers for: asset hashing, Gzip/Brotli compression, SCSS import chain, post-v14 frontend build pipelines, stale page cache after a build.
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SKILL.md
TYPO3 Vite Skill
Vite 7 build configuration for TYPO3 v13 and v14 LTS sitepackages with praetorius/vite-asset-collector. Gold standard: v14.3 LTS (2026-04-21).
v14 context: TYPO3 v14.0 removed the core's built-in frontend CSS/JS concatenation, compression, and CSS comment/whitespace stripping (Breaking #108055, #107944). config.concatenateCss/compressCss/concatenateJs/compressJs no longer have any effect -- an external build tool 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) importing its SCSS and TypeScript, enabling code splitting -- only visible content elements' CSS/JS is loaded.
Selective Bootstrap Imports
Never import Bootstrap as a whole -- import only the components used (bootstrap/scss/grid, bootstrap/scss/buttons) to minimize CSS size.
SVG Optimization
Custom SvgCopyOptimizePlugin processes SVGs from Resources/Private/Svg/ through SVGO into Resources/Public/Svg/, with dev-mode file watching.
CSP Compliance
Assets loaded via <vite:asset> ViewHelper automatically get nonce attributes for CSP compliance -- no inline <script>/<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). 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. Set both options inside the single existing server: block -- a second server: { ... } literal silently overwrites the first's keys without warning. See references/vite-configuration.md.
Stale Page Cache After a Build Trap
vite build mints new content hashes and deletes the old files, but TYPO3's page cache keeps rendering markup with the old names -- the browser 404s on main.entry-<oldhash>.js and the page loads with no JS/CSS while still rendering normally, looking like a broken feature rather than a broken asset. Run vendor/bin/typo3 cache:flush as part of the build and verify what's actually served rather than trusting the build timestamp -- an unloaded bundle and a correctly idle one look identical to a naive check. See references/vite-configuration.md.
