chore: upgrade Tailwind CSS v3 → v4#180
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josecelano merged 1 commit intodevelopfrom Feb 26, 2026
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Upgrades Tailwind CSS and related packages: - tailwindcss: ^3.4.19 → ^4.2.1 - prettier-plugin-tailwindcss: ^0.6.10 → ^0.7.2 - @tailwindcss/vite: new (replaces PostCSS Tailwind plugin for Vite) - autoprefixer: removed (v4 handles vendor prefixes automatically) Migration steps performed (using official @tailwindcss/upgrade tool + manual fixes): 1. src/app.css: Migrated from @tailwind directives to CSS-first approach: - @tailwind base/components/utilities → @import 'tailwindcss' - plugins (typography, forms, container-queries) → @plugin directives - content array → @source directive - Added v4 compatibility base styles for default border-color 2. vite.config.ts: Added @tailwindcss/vite plugin (recommended over PostCSS for Vite projects). Placed before sveltekit() for proper CSS processing order. 3. postcss.config.js: Removed tailwindcss and autoprefixer plugins (now handled by @tailwindcss/vite and v4's built-in vendor prefixing). 4. tailwind.config.ts: Deleted — theme was empty (no customisations) and plugins are now declared via @plugin in app.css. No template changes needed: the project has no renamed utility usages (shadow-sm, outline-none, ring, etc.) and no @apply in Sass files. The Sass files (src/lib/scss/) are unaffected as they don't use Tailwind directives. All checks pass: - svelte-check: 0 errors, 0 warnings - build: success - lint: success (Prettier + ESLint) Closes #169 Part of epic #174
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Overview
Upgrades Tailwind CSS from v3 to v4 — a ground-up rewrite with a CSS-first configuration model.
Part of epic #174.
Closes #169
Package Changes
tailwindcss^3.4.19^4.2.1prettier-plugin-tailwindcss^0.6.10^0.7.2@tailwindcss/vite^4.2.1(new)autoprefixer^10.4.24The plugin packages (
@tailwindcss/typography,@tailwindcss/forms,@tailwindcss/container-queries) stay at their current versions — they work with v4 via the new@plugindirective.Migration Details
Used the official
@tailwindcss/upgradetool for the initial migration, then applied manual fixes.src/app.css
@tailwind base/components/utilities→@import 'tailwindcss'tailwind.config.ts→@plugindirectivescontentarray migrated to@sourcedirectiveborder-color(wasgray-200, nowcurrentColor)vite.config.ts
@tailwindcss/viteplugin (recommended for Vite projects over PostCSS)sveltekit()for correct CSS processing orderpostcss.config.js
tailwindcssandautoprefixerplugins (both now handled internally by@tailwindcss/vite)tailwind.config.ts — deleted
extend: {})@plugininapp.cssWhat Was NOT Needed
shadow-sm→shadow-xs,outline-none→outline-hidden,ring→ring-3, etc.)src/lib/scss/files and<style lang="scss">component blocks are unaffected — they use pure Sass features and no@applyTesting Checklist
svelte-check: 0 errors, 0 warningsnpm run build: successnpm run lint: success (Prettier + ESLint)