--- title: "SvelteKit + Svelte 5 + Tailwind CSS Integration Patterns" version_anchors: ["SvelteKit@2.x", "Svelte@5.x", "Tailwind@4.x"] authored: true origin: self adapted_from: - "sveltejs/kit#4991df5 (SvelteKit documentation)" - "sveltejs/svelte#1b2f7b0 (Svelte 5 documentation)" - "tailwindlabs/tailwindcss#91694fb (Tailwind CSS v4 documentation)" last_reviewed: 2025-10-28 summary: "Complete integration guide combining SvelteKit 2.x, Svelte 5 runes, and Tailwind CSS v4 including configuration strategies, component patterns, styling approaches, build optimization, and deployment" --- # SvelteKit + Svelte 5 + Tailwind CSS Integration Patterns Complete guide to integrating SvelteKit 2.x, Svelte 5, and Tailwind CSS v4 in production applications. ## Complete Setup ### Project Initialization ```bash # Create SvelteKit project npx sv create my-app cd my-app # Install Tailwind CSS v4 npm install tailwindcss@next @tailwindcss/vite@next ``` ### Configuration Files **vite.config.js:** ```js import { sveltekit } from '@sveltejs/kit/vite'; import tailwindcss from '@tailwindcss/vite'; import { defineConfig } from 'vite'; export default defineConfig({ plugins: [ sveltekit(), tailwindcss() ] }); ``` **svelte.config.js:** ```js import adapter from '@sveltejs/adapter-auto'; import { vitePreprocess } from '@sveltejs/vite-plugin-svelte'; export default { preprocess: vitePreprocess(), kit: { adapter: adapter() } }; ``` **src/app.css:** ```css @import "tailwindcss"; @theme { --color-primary: #0ea5e9; --color-secondary: #8b5cf6; --font-sans: Inter, system-ui, sans-serif; } ``` **src/routes/+layout.svelte:** ```svelte ``` ## Component Patterns ### Reactive Styling with $state ```svelte {#if isOpen}

Content

{/if} ``` ### Dynamic Classes with $derived ```svelte

Count: {count}

``` ### Reusable Component with Props ```svelte ``` **Usage:** ```svelte ``` ### Form Components with Bindings ```svelte

{#if label} {label} {/if} {#if error}

{error}

{/if}

``` **Usage:** ```svelte ``` ## Layout Patterns ### Responsive Grid Layout ```svelte

{@render children()}

``` ### Dashboard Layout with Sidebar ```svelte

{@render children()}

``` ## Form Handling with SvelteKit Actions ```svelte

Contact Us

``` ```js // routes/contact/+page.server.js import { fail } from '@sveltejs/kit'; export const actions = { default: async ({ request }) => { const data = await request.formData(); const email = data.get('email'); const name = data.get('name'); const message = data.get('message'); // Validation if (!email || !email.includes('@')) { return fail(400, { errors: { email: 'Valid email required' } }); } // Send email (implementation depends on your email service) try { await sendEmail({ email, name, message }); return { success: true }; } catch (error) { return fail(500, { errors: { general: 'Failed to send message' } }); } } }; ``` ## Data Loading Patterns ### Loading with Skeleton UI ```svelte

{data.post.title}

{@html data.post.content}

Comments

{#await data.comments}

{#each Array(3) as _}

{/each}

{:then comments}

{#each comments as comment}

{comment.author}

{comment.text}

{/each}

{:catch error}

Failed to load comments

{/await}

``` ```js // routes/blog/[slug]/+page.server.js export async function load({ params }) { return { post: await db.getPost(params.slug), // Awaited comments: db.getComments(params.slug) // Streamed }; } ``` ### Infinite Scroll ```svelte

{#each data.posts as post}

{post.title}

{post.excerpt}

{/each}

{#if loading}

{:else}

Scroll for more

{/if}

``` ## Dark Mode Integration ```svelte ``` **Usage in layout:** ```svelte

{@render children()}

``` ## Build Optimization ### Production Configuration ```js // vite.config.js import { sveltekit } from '@sveltejs/kit/vite'; import tailwindcss from '@tailwindcss/vite'; import { defineConfig } from 'vite'; export default defineConfig(({ mode }) => ({ plugins: [ sveltekit(), tailwindcss({ optimize: mode === 'production' }) ], build: { cssCodeSplit: true, cssMinify: 'lightningcss', sourcemap: mode !== 'production' } })); ``` ### Code Splitting ```js // routes/dashboard/+page.svelte {#if Chart} {:else}

Loading chart...

{/if} ``` ## Deployment Patterns ### Environment-Specific Styling ```js // tailwind.config.js export default { content: ['./src/**/*.{html,js,svelte,ts}'], theme: { extend: { colors: { primary: process.env.NODE_ENV === 'production' ? '#0ea5e9' : '#ef4444' // Different color in dev } } } }; ``` ### Static Export for CDN ```js // svelte.config.js import adapter from '@sveltejs/adapter-static'; export default { kit: { adapter: adapter({ pages: 'build', assets: 'build', precompress: true }), prerender: { entries: ['*'] } } }; ``` ## Complete Example: Blog Application ``` src/ ├── lib/ │ ├── components/ │ │ ├── Button.svelte │ │ ├── Input.svelte │ │ └── Card.svelte │ └── server/ │ └── database.js ├── routes/ │ ├── blog/ │ │ ├── [slug]/ │ │ │ ├── +page.svelte │ │ │ └── +page.server.js │ │ ├── +page.svelte │ │ └── +page.server.js │ ├── +layout.svelte │ └── +page.svelte ├── app.css └── app.html ``` This integration provides: - ✅ Full SSR with SvelteKit - ✅ Reactive components with Svelte 5 runes - ✅ Utility-first styling with Tailwind CSS v4 - ✅ Optimized build pipeline - ✅ Production-ready deployment