## Pages ### svelte_5_migration Migrate Svelte 4 to Svelte 5: update configs (components.json aliases/registry, tailwind.config.js with tailwindcss-animate and sidebar colors), simplify utils.ts, update dependencies (bits-ui@1.0.0, svelte-sonner@1.0.0, @lucide/svelte@0.482.0, paneforge@1.0.0-next.5, vaul-svelte@1.0.0-next.7, mode-watcher@1.0.0), migrate components with `npx shadcn-svelte@latest add -y -o`, remove cmdk-sv/svelte-headless-table/svelte-radix/lucide-svelte. ## Svelte 4 to Svelte 5 Migration Migrate from Svelte 4 with Tailwind 3 to Svelte 5 with Tailwind 3, then optionally to Tailwind 4. ### Prerequisites - Read Svelte's v5 migration guide - Commit pending changes - Identify components with custom behavior/styles for reimplementation - Use `sv-migrate` CLI tool to assist migration ### Update Configs **components.json**: Add `registry` field and new aliases: ```json { "registry": "https://shadcn-svelte.com/registry", "aliases": { "components": "$lib/components", "utils": "$lib/utils", "ui": "$lib/components/ui", "hooks": "$lib/hooks", "lib": "$lib" } } ``` **tailwind.config.js**: Install and add `tailwindcss-animate` plugin, add sidebar color variables and animations: ```bash npm i tailwindcss-animate ``` ```ts import tailwindcssAnimate from "tailwindcss-animate"; const config = { theme: { extend: { colors: { sidebar: { DEFAULT: "hsl(var(--sidebar-background))", foreground: "hsl(var(--sidebar-foreground))", primary: "hsl(var(--sidebar-primary))", "primary-foreground": "hsl(var(--sidebar-primary-foreground))", accent: "hsl(var(--sidebar-accent))", "accent-foreground": "hsl(var(--sidebar-accent-foreground))", border: "hsl(var(--sidebar-border))", ring: "hsl(var(--sidebar-ring))", }, }, keyframes: { "accordion-down": { from: { height: "0" }, to: { height: "var(--bits-accordion-content-height)" } }, "accordion-up": { from: { height: "var(--bits-accordion-content-height)" }, to: { height: "0" } }, "caret-blink": { "0%,70%,100%": { opacity: "1" }, "20%,50%": { opacity: "0" } }, }, animation: { "accordion-down": "accordion-down 0.2s ease-out", "accordion-up": "accordion-up 0.2s ease-out", "caret-blink": "caret-blink 1.25s ease-out infinite", }, }, }, plugins: [tailwindcssAnimate], }; ``` **utils.ts**: Update to export only `cn` function and utility types: ```ts import { type ClassValue, clsx } from "clsx"; import { twMerge } from "tailwind-merge"; export function cn(...inputs: ClassValue[]) { return twMerge(clsx(inputs)); } export type WithoutChild = T extends { child?: any } ? Omit : T; export type WithoutChildren = T extends { children?: any } ? Omit : T; export type WithoutChildrenOrChild = WithoutChildren>; export type WithElementRef = T & { ref?: U | null }; ``` ### Upgrade Components **Optional: Alias old dependencies** for gradual migration: ```json { "devDependencies": { "bits-ui-old": "npm:bits-ui@0.22.0" } } ``` Then update imports: `import { Dialog } from "bits-ui-old";` **Update dependencies** to Svelte 5 compatible versions: ```bash npm i bits-ui@latest svelte-sonner@latest @lucide/svelte@latest paneforge@next vaul-svelte@next mode-watcher@latest -D ``` Updated versions: - `bits-ui` → `^1.0.0` - `svelte-sonner` → `^1.0.0` - `@lucide/svelte` → `^0.482.0` - `paneforge` → `^1.0.0-next.5` - `vaul-svelte` → `^1.0.0-next.7` - `mode-watcher` → `^1.0.0` **Deprecated/replaced dependencies**: - `cmdk-sv` → replaced by Bits UI's `Command` component - `svelte-headless-table` → replaced by `@tanstack/table-core` - `svelte-radix` → replaced by `@lucide/svelte` - `lucide-svelte` → replaced by `@lucide/svelte` **Migrate components**: Commit changes, then run CLI to replace components: ```bash git add . && git commit -m 'before migration' npx shadcn-svelte@latest add dialog -y -o ``` The `-y` flag skips confirmation, `-o` overwrites existing files. Review diffs and repeat for each component. **Remove unused dependencies**: ```bash npm uninstall cmdk-sv svelte-headless-table svelte-radix lucide-svelte ``` ### Next Steps After completing Svelte 5 migration, proceed to Tailwind 4 migration guide. ### tailwind_v4_migration Upgrade shadcn-svelte from Tailwind v3→v4 and Svelte 4→5: use Vite instead of PostCSS, replace `tailwind.config.ts` with CSS-based `@theme inline` in `app.css`, wrap colors in `hsl()`, replace `tailwindcss-animate` with `tw-animate-css`, use `size-*` utility, update dependencies and type helpers. ## Tailwind v4 Migration Guide ### Overview Complete guide for upgrading shadcn-svelte projects from Tailwind v3 to v4 and Svelte 4 to v5. The `@latest` CLI now supports initializing projects with Tailwind v4 and Svelte 5. ### Key Changes in v4 - New `@theme` directive and `@theme inline` option for CSS-based configuration - All components updated with `data-slot` attributes for styling - Buttons now use default cursor - `default` style deprecated; new projects use `new-york` - HSL colors converted to OKLCH (non-breaking: existing Tailwind v3 apps continue working) - Dark mode colors revisited for better accessibility ### Prerequisites - Coming from Svelte 5 + Tailwind v3 (if on Svelte 4, first follow Svelte 4→5 migration) - Read Tailwind v4 Compatibility Docs to ensure browser support (uses bleeding-edge features) ### Upgrade Steps **1. Follow Tailwind v4 Upgrade Guide** - Run official upgrade: https://tailwindcss.com/docs/upgrade-guide - Use `@tailwindcss/upgrade` codemod to remove deprecated utilities and update config **2. Replace PostCSS with Vite** - Delete `postcss.config.js` - Uninstall `@tailwindcss/postcss`: `npm uninstall @tailwindcss/postcss` - Install `@tailwindcss/vite`: `npm i @tailwindcss/vite -D` - Update `vite.config.ts`: ```ts import tailwindcss from '@tailwindcss/vite'; export default defineConfig({ plugins: [tailwindcss(), sveltekit()], }); ``` **3. Update `app.css`** - Replace `tailwindcss-animate` with `tw-animate-css`: `npm uninstall tailwindcss-animate && npm i tw-animate-css -D` - Import both: `@import "tailwindcss"; @import "tw-animate-css";` - Add custom dark variant: `@custom-variant dark (&:is(.dark *));` - Remove border color compatibility styles (dead code) - Move CSS variables to `:root` and `.dark` selectors, wrap color values in `hsl()` - Replace `tailwind.config.ts` with `@theme inline` directive containing radius and color definitions - Example structure: ```css @import "tailwindcss"; @import "tw-animate-css"; @custom-variant dark (&:is(.dark *)); :root { --background: hsl(0 0% 100%); --foreground: hsl(240 10% 3.9%); /* ... other variables */ --radius: 0.5rem; } .dark { --background: hsl(240 10% 3.9%); /* ... dark mode variables */ } @theme inline { --radius-sm: calc(var(--radius) - 4px); --radius-md: calc(var(--radius) - 2px); --radius-lg: var(--radius); --radius-xl: calc(var(--radius) + 4px); --color-background: var(--background); /* ... all color mappings */ } @layer base { * { @apply border-border; } body { @apply bg-background text-foreground; } } ``` - Delete `tailwind.config.ts` after verification **4. Use new `size-*` utility** - Replace `w-* h-*` with `size-*`: `w-4 h-4` → `size-4` **5. Update dependencies** ```bash npm i bits-ui@latest @lucide/svelte@latest tailwind-variants@latest tailwind-merge@latest clsx@latest svelte-sonner@latest paneforge@next vaul-svelte@next formsnap@latest ``` **6. Update `utils.ts` (optional)** Type helpers previously from `bits-ui` now in utils: ```ts export type WithoutChild = T extends { child?: any } ? Omit : T; export type WithoutChildren = T extends { children?: any } ? Omit : T; export type WithoutChildrenOrChild = WithoutChildren>; export type WithElementRef = T & { ref?: U | null }; ``` Update imports in components: `import type { WithElementRef } from "$lib/utils.js";` **7. Update Colors (optional)** - Commit changes: `git add . && git commit -m "..."` - Re-add all components with overwrite: `npx shadcn-svelte@latest add --all --overwrite` - Update dark mode colors in `app.css` to new OKLCH values (see Base Colors reference) - Review git diffs and re-apply custom changes ### Resources - Demo site: https://v4.shadcn-svelte.com - Installation docs: SvelteKit, Astro, Vite, Manual - Report bugs on GitHub

Migration Guides