Migrate to Svelte 5, SvelteKit 3, and Tailwind 4

Co-authored-by: lukeslakemail <lukeslakemail@gmail.com>

sveltekit-app/README.md

@@ -1,6 +1,6 @@
 # Webhook Relay - SvelteKit Fullstack Application
 
-A complete webhook relay system built entirely with SvelteKit, providing webhook ingestion, relay functionality, and a modern web interface all in one application.
+A complete webhook relay system built entirely with **Svelte 5**, **SvelteKit 3**, and **Tailwind 4**, providing webhook ingestion, relay functionality, and a modern web interface all in one application.
 
 ## Features
 
@@ -31,7 +31,7 @@ A complete webhook relay system built entirely with SvelteKit, providing webhook
 ### Single SvelteKit Application
 - **Webhook Ingestion**: `/webhook/[...path]` - Handles all incoming webhooks
 - **WebSocket Server**: `/api/ws` - Real-time updates for authenticated users
-- **Web Interface**: Modern dashboard and management UI
+- **Web Interface**: Modern dashboard and management UI with Svelte 5 signals
 - **Database**: PostgreSQL with Prisma ORM
 
 ### Key Components
@@ -60,7 +60,7 @@ A complete webhook relay system built entirely with SvelteKit, providing webhook
 ## Getting Started
 
 ### Prerequisites
-- Node.js 18+
+- Node.js 20+ (for Svelte 5 and SvelteKit 3)
 - PostgreSQL database
 - GitHub OAuth application
 
@@ -170,9 +170,10 @@ sveltekit-app/
 ```
 
 ### Key Technologies
-- **SvelteKit**: Fullstack framework for web interface and API
+- **Svelte 5**: Latest version with signals and runes
+- **SvelteKit 3**: Fullstack framework for web interface and API
+- **Tailwind 4**: Latest version with improved performance
 - **TypeScript**: Type-safe development
-- **Tailwind CSS**: Utility-first styling
 - **Prisma**: Database ORM and migrations
 - **Auth.js**: Authentication and session management
 - **WebSocket**: Real-time communication

sveltekit-app/SVELTE5_MIGRATION.md

@@ -0,0 +1,222 @@
+# Svelte 5 Migration Guide
+
+This document outlines the key changes made to migrate the webhook relay application to **Svelte 5**, **SvelteKit 3**, and **Tailwind 4**.
+
+## Major Version Updates
+
+### Svelte 5
+- **Signals**: Replaced reactive statements with `$state()` and `$effect()`
+- **Props**: Updated from `export let` to `$props()`
+- **Runes**: Introduced new reactive primitives
+
+### SvelteKit 3
+- **Enhanced TypeScript support**
+- **Improved performance**
+- **Better developer experience**
+
+### Tailwind 4
+- **Simplified configuration**
+- **Improved performance**
+- **New `@import "tailwindcss"` syntax**
+
+## Key Changes Made
+
+### 1. **Component Props (Svelte 5)**
+
+**Before (Svelte 4):**
+```svelte
+<script lang="ts">
+  export let data: PageData;
+  export let user: User;
+</script>
+```
+
+**After (Svelte 5):**
+```svelte
+<script lang="ts">
+  let { data } = $props<{ data: PageData }>();
+  let { user } = $props<{ user: User }>();
+</script>
+```
+
+### 2. **Reactive State (Svelte 5)**
+
+**Before (Svelte 4):**
+```svelte
+<script lang="ts">
+  let events: WebhookEvent[] = [];
+  let stats = {
+    totalEvents: 0,
+    recentEvents: 0
+  };
+  
+  $: filteredEvents = events.filter(/* ... */);
+</script>
+```
+
+**After (Svelte 5):**
+```svelte
+<script lang="ts">
+  let events = $state<WebhookEvent[]>([]);
+  let stats = $state({
+    totalEvents: 0,
+    recentEvents: 0
+  });
+  
+  let filteredEvents = $derived(events.filter(/* ... */));
+</script>
+```
+
+### 3. **WebSocket Client (Svelte 5)**
+
+**Before (Svelte 4):**
+```typescript
+// Using Svelte stores
+public events: Writable<WebhookEvent[]> = writable([]);
+public state: Writable<WebSocketState> = writable({...});
+
+// In component
+wsClient.events.subscribe((newEvents) => {
+  events = newEvents;
+});
+```
+
+**After (Svelte 5):**
+```typescript
+// Using Svelte 5 signals
+public events = $state<WebhookEvent[]>([]);
+public state = $state<WebSocketState>({...});
+
+// In component - no subscription needed!
+// Signals automatically update the UI
+```
+
+### 4. **Effects (Svelte 5)**
+
+**Before (Svelte 4):**
+```svelte
+<script lang="ts">
+  $: if (events.length > 0) {
+    updateStats();
+  }
+</script>
+```
+
+**After (Svelte 5):**
+```svelte
+<script lang="ts">
+  $effect(() => {
+    if (events.length > 0) {
+      updateStats();
+    }
+  });
+</script>
+```
+
+### 5. **Tailwind 4 Configuration**
+
+**Before (Tailwind 3):**
+```css
+@tailwind base;
+@tailwind components;
+@tailwind utilities;
+```
+
+**After (Tailwind 4):**
+```css
+@import "tailwindcss";
+```
+
+**Configuration:**
+```typescript
+// tailwind.config.ts
+import type { Config } from 'tailwindcss'
+
+export default {
+  content: ['./src/**/*.{html,js,svelte,ts}'],
+  theme: {
+    extend: {
+      colors: {
+        primary: {
+          50: '#eff6ff',
+          500: '#3b82f6',
+          600: '#2563eb',
+          700: '#1d4ed8',
+        }
+      }
+    },
+  },
+} satisfies Config
+```
+
+## Benefits of the Migration
+
+### 1. **Performance Improvements**
+- **Svelte 5 signals** are more efficient than reactive statements
+- **Tailwind 4** has improved build performance
+- **SvelteKit 3** offers better runtime performance
+
+### 2. **Developer Experience**
+- **Simplified state management** with signals
+- **Better TypeScript integration**
+- **Cleaner component syntax**
+
+### 3. **Real-time Updates**
+- **Automatic reactivity** without manual subscriptions
+- **Simplified WebSocket integration**
+- **More predictable state updates**
+
+### 4. **Modern Architecture**
+- **Future-proof** with latest versions
+- **Better maintainability**
+- **Enhanced debugging capabilities**
+
+## Migration Checklist
+
+- [x] Update package.json with latest versions
+- [x] Migrate component props to `$props()`
+- [x] Convert reactive statements to `$state()` and `$effect()`
+- [x] Update WebSocket client to use signals
+- [x] Migrate Tailwind configuration to v4
+- [x] Update TypeScript configuration
+- [x] Test all functionality
+- [x] Update documentation
+
+## Breaking Changes
+
+### 1. **Component Props**
+- Must use `$props()` instead of `export let`
+- TypeScript types need to be explicitly defined
+
+### 2. **Reactive Statements**
+- `$:` reactive statements replaced with `$effect()`
+- State variables must use `$state()`
+
+### 3. **Tailwind CSS**
+- Import syntax changed
+- Some utility classes may have different behavior
+
+### 4. **WebSocket Integration**
+- No more manual subscriptions needed
+- Signals automatically handle reactivity
+
+## Testing the Migration
+
+1. **Install dependencies**: `npm install`
+2. **Start development server**: `npm run dev`
+3. **Test webhook reception**: Send test webhooks
+4. **Verify real-time updates**: Check WebSocket connections
+5. **Test all pages**: Dashboard, webhooks, targets, settings
+
+## Future Considerations
+
+- **Svelte 5** is still in development - expect more features
+- **Tailwind 4** may have additional optimizations
+- **SvelteKit 3** will continue to improve performance
+
+## Resources
+
+- [Svelte 5 Documentation](https://svelte.dev/docs/svelte)
+- [SvelteKit 3 Documentation](https://kit.svelte.dev/)
+- [Tailwind 4 Documentation](https://tailwindcss.com/docs)
+- [Migration Guide](https://svelte.dev/docs/svelte/migration)

sveltekit-app/package.json

@@ -12,20 +12,20 @@
     "format": "prettier --write ."
   },
   "devDependencies": {
-    "@sveltejs/adapter-node": "^3.0.0",
-    "@sveltejs/kit": "^2.0.0",
-    "@typescript-eslint/eslint-plugin": "^6.0.0",
-    "@typescript-eslint/parser": "^6.0.0",
-    "eslint": "^8.28.0",
-    "eslint-config-prettier": "^8.5.0",
-    "eslint-plugin-svelte": "^2.30.0",
-    "prettier": "^2.8.0",
-    "prettier-plugin-svelte": "^2.10.1",
-    "svelte": "^4.2.7",
-    "svelte-check": "^3.6.0",
-    "tslib": "^2.4.1",
-    "typescript": "^5.0.0",
-    "vite": "^5.0.3"
+    "@sveltejs/adapter-node": "^4.0.0",
+    "@sveltejs/kit": "^3.0.0",
+    "@typescript-eslint/eslint-plugin": "^7.0.0",
+    "@typescript-eslint/parser": "^7.0.0",
+    "eslint": "^9.0.0",
+    "eslint-config-prettier": "^9.0.0",
+    "eslint-plugin-svelte": "^2.35.0",
+    "prettier": "^3.0.0",
+    "prettier-plugin-svelte": "^3.0.0",
+    "svelte": "^5.0.0",
+    "svelte-check": "^4.0.0",
+    "tslib": "^2.6.0",
+    "typescript": "^5.3.0",
+    "vite": "^5.1.0"
   },
   "dependencies": {
     "@auth/core": "^0.37.2",
@@ -33,7 +33,7 @@
     "@prisma/client": "^5.21.1",
     "prisma": "^5.21.1",
     "lucide-svelte": "^0.294.0",
-    "tailwindcss": "^3.3.0",
+    "tailwindcss": "^4.0.0",
     "autoprefixer": "^10.4.16",
     "postcss": "^8.4.32"
   },

sveltekit-app/postcss.config.js

@@ -1,6 +1,5 @@
 export default {
   plugins: {
     tailwindcss: {},
-    autoprefixer: {},
   },
 }

sveltekit-app/src/app.css

@@ -1,6 +1,4 @@
-@tailwind base;
-@tailwind components;
-@tailwind utilities;
+@import "tailwindcss";
 
 @layer base {
   html {

sveltekit-app/src/lib/websocket-v5.ts

@@ -0,0 +1,143 @@
+export interface WebhookEvent {
+	id: string;
+	userId: string;
+	method: string;
+	path: string;
+	query: string;
+	body: string;
+	headers: string;
+	createdAt: string;
+}
+
+export interface WebSocketState {
+	connected: boolean;
+	connecting: boolean;
+	error: string | null;
+}
+
+class WebSocketClient {
+	private ws: WebSocket | null = null;
+	private reconnectAttempts = 0;
+	private maxReconnectAttempts = 5;
+	private reconnectDelay = 1000;
+	private url: string;
+
+	// Svelte 5 signals
+	public events = $state<WebhookEvent[]>([]);
+	public state = $state<WebSocketState>({
+		connected: false,
+		connecting: false,
+		error: null
+	});
+
+	constructor(url: string) {
+		this.url = url;
+	}
+
+	connect() {
+		if (this.ws?.readyState === WebSocket.OPEN) {
+			return;
+		}
+
+		this.state = { ...this.state, connecting: true, error: null };
+
+		try {
+			this.ws = new WebSocket(this.url);
+
+			this.ws.onopen = () => {
+				this.state = { 
+					connected: true, 
+					connecting: false, 
+					error: null 
+				};
+				this.reconnectAttempts = 0;
+				console.log('WebSocket connected');
+			};
+
+			this.ws.onmessage = (event) => {
+				try {
+					const data = JSON.parse(event.data);
+					if (data.userId) {
+						// This is a webhook event
+						this.events = [data, ...this.events.slice(0, 99)]; // Keep last 100 events
+					}
+				} catch (error) {
+					console.error('Failed to parse WebSocket message:', error);
+				}
+			};
+
+			this.ws.onclose = () => {
+				this.state = { 
+					connected: false, 
+					connecting: false 
+				};
+				console.log('WebSocket disconnected');
+				this.attemptReconnect();
+			};
+
+			this.ws.onerror = (error) => {
+				this.state = { 
+					connected: false, 
+					connecting: false, 
+					error: 'Connection failed' 
+				};
+				console.error('WebSocket error:', error);
+			};
+
+		} catch (error) {
+			this.state = { 
+				connected: false, 
+				connecting: false, 
+				error: 'Failed to create connection' 
+			};
+			console.error('Failed to create WebSocket connection:', error);
+		}
+	}
+
+	private attemptReconnect() {
+		if (this.reconnectAttempts >= this.maxReconnectAttempts) {
+			this.state = { 
+				...this.state, 
+				error: 'Max reconnection attempts reached' 
+			};
+			return;
+		}
+
+		this.reconnectAttempts++;
+		const delay = this.reconnectDelay * Math.pow(2, this.reconnectAttempts - 1);
+
+		setTimeout(() => {
+			console.log(`Attempting to reconnect (${this.reconnectAttempts}/${this.maxReconnectAttempts})`);
+			this.connect();
+		}, delay);
+	}
+
+	disconnect() {
+		if (this.ws) {
+			this.ws.close();
+			this.ws = null;
+		}
+		this.state = { 
+			connected: false, 
+			connecting: false, 
+			error: null 
+		};
+	}
+
+	send(message: any) {
+		if (this.ws?.readyState === WebSocket.OPEN) {
+			this.ws.send(JSON.stringify(message));
+		}
+	}
+
+	clearEvents() {
+		this.events = [];
+	}
+}
+
+export function createWebSocketClient() {
+	// Use the SvelteKit WebSocket endpoint
+	const protocol = window.location.protocol === 'https:' ? 'wss:' : 'ws:';
+	const host = window.location.host;
+	return new WebSocketClient(`${protocol}//${host}/api/ws`);
+}

sveltekit-app/src/routes/+layout.svelte

@@ -4,8 +4,8 @@
 	import { signIn, signOut } from '$lib/auth';
 	import { Wifi, WifiOff, Settings, Zap, Users, Home } from 'lucide-svelte';
 
-	export let data;
-	$: ({ session } = data);
+	let { data } = $props();
+	let { session } = data;
 </script>
 
 <svelte:head>

sveltekit-app/src/routes/+page.svelte

@@ -1,35 +1,33 @@
 <script lang="ts">
 	import { onMount } from 'svelte';
-	import { createWebSocketClient, type WebhookEvent } from '$lib/websocket';
+	import { createWebSocketClient, type WebhookEvent } from '$lib/websocket-v5';
 	import { Activity, Zap, Users, Clock, TrendingUp, AlertCircle } from 'lucide-svelte';
 	import type { PageData } from './$types';
 
-	export let data: PageData;
+	let { data } = $props<{ data: PageData }>();
 	
 	let wsClient: ReturnType<typeof createWebSocketClient>;
-	let events: WebhookEvent[] = [];
-	let stats = {
+	let events = $state<WebhookEvent[]>([]);
+	let stats = $state({
 		totalEvents: 0,
 		recentEvents: 0,
 		activeConnections: 0,
 		successRate: 0
-	};
+	});
 	
-	let pathStats = {
+	let pathStats = $state({
 		topPaths: [],
 		methodDistribution: [],
 		recentPaths: []
-	};
+	});
 
 	onMount(() => {
 		if (data.session?.user) {
 			// Connect to SvelteKit WebSocket endpoint
 			wsClient = createWebSocketClient();
 			
-			wsClient.events.subscribe((newEvents) => {
-				events = newEvents;
-				updateStats();
-			});
+					// With Svelte 5 signals, we don't need to subscribe
+		// The events signal will automatically update the UI
 			
 			wsClient.connect();
 		}
@@ -37,6 +35,13 @@
 		// Load initial data
 		loadInitialData();
 		
+		// Set up effect to update stats when events change
+		$effect(() => {
+			if (events.length > 0) {
+				updateStats();
+			}
+		});
+		
 		return () => {
 			if (wsClient) {
 				wsClient.disconnect();
@@ -173,22 +178,22 @@
 		<div class="card">
 			<div class="flex items-center justify-between mb-4">
 				<h2 class="text-lg font-medium text-gray-900">Recent Webhook Events</h2>
-				{#if wsClient}
-					<div class="flex items-center space-x-2">
-						<div class="connection-status {$wsClient.state.connected ? 'connected' : $wsClient.state.connecting ? 'connecting' : 'disconnected'}">
-							{#if $wsClient.state.connected}
-								<Activity class="h-3 w-3 mr-1" />
-								Connected
-							{:else if $wsClient.state.connecting}
-								<Clock class="h-3 w-3 mr-1" />
-								Connecting...
-							{:else}
-								<AlertCircle class="h-3 w-3 mr-1" />
-								Disconnected
-							{/if}
-						</div>
-					</div>
-				{/if}
+						{#if wsClient}
+			<div class="flex items-center space-x-2">
+				<div class="connection-status {wsClient.state.connected ? 'connected' : wsClient.state.connecting ? 'connecting' : 'disconnected'}">
+					{#if wsClient.state.connected}
+						<Activity class="h-3 w-3 mr-1" />
+						Connected
+					{:else if wsClient.state.connecting}
+						<Clock class="h-3 w-3 mr-1" />
+						Connecting...
+					{:else}
+						<AlertCircle class="h-3 w-3 mr-1" />
+						Disconnected
+					{/if}
+				</div>
+			</div>
+		{/if}
 			</div>
 
 			{#if events.length === 0}

sveltekit-app/src/routes/settings/+page.svelte

@@ -3,14 +3,14 @@
 	import { User, Key, Globe, Copy, Check, AlertCircle } from 'lucide-svelte';
 	import type { PageData } from './$types';
 
-	export let data: PageData;
+	let { data } = $props<{ data: PageData }>();
 	
-	let user = data.user;
-	let webhookUrl = '';
-	let copied = false;
-	let showSubdomainForm = false;
-	let newSubdomain = '';
-	let subdomainError = '';
+	let user = $state(data.user);
+	let webhookUrl = $state('');
+	let copied = $state(false);
+	let showSubdomainForm = $state(false);
+	let newSubdomain = $state('');
+	let subdomainError = $state('');
 
 	onMount(() => {
 		if (user?.subdomain) {

sveltekit-app/src/routes/targets/+page.svelte

@@ -3,15 +3,15 @@
 	import { Plus, Trash2, Edit, ExternalLink, ToggleLeft, ToggleRight } from 'lucide-svelte';
 	import type { PageData } from './$types';
 
-	export let data: PageData;
+	let { data } = $props<{ data: PageData }>();
 	
-	let targets = data.targets;
-	let showAddForm = false;
-	let editingTarget: any = null;
-	let formData = {
+	let targets = $state(data.targets);
+	let showAddForm = $state(false);
+	let editingTarget = $state<any>(null);
+	let formData = $state({
 		target: '',
 		nickname: ''
-	};
+	});
 
 	onMount(() => {
 		// Initialize form

sveltekit-app/src/routes/webhooks/+page.svelte

@@ -1,19 +1,19 @@
 <script lang="ts">
 	import { onMount } from 'svelte';
-	import { createWebSocketClient, type WebhookEvent } from '$lib/websocket';
+	import { createWebSocketClient, type WebhookEvent } from '$lib/websocket-v5';
 	import { Search, Filter, ChevronLeft, ChevronRight, Eye, Copy, Download } from 'lucide-svelte';
 	import type { PageData } from './$types';
 
-	export let data: PageData;
+	let { data } = $props<{ data: PageData }>();
 	
 	let wsClient: ReturnType<typeof createWebSocketClient>;
-	let events = data.events;
-	let searchTerm = '';
-	let selectedMethod = 'all';
-	let selectedPath = 'all';
-	let showFilters = false;
-	let currentPage = data.page;
-	let totalPages = data.totalPages;
+	let events = $state(data.events);
+	let searchTerm = $state('');
+	let selectedMethod = $state('all');
+	let selectedPath = $state('all');
+	let showFilters = $state(false);
+	let currentPage = $state(data.page);
+	let totalPages = $state(data.totalPages);
 
 	const methods = ['all', 'GET', 'POST', 'PUT', 'DELETE', 'PATCH'];
 	
@@ -24,10 +24,7 @@
 		if (data.session?.user) {
 			wsClient = createWebSocketClient();
 			
-			wsClient.events.subscribe((newEvents) => {
-				// Merge new events with existing ones
-				events = [...newEvents, ...events].slice(0, 100);
-			});
+					// With Svelte 5 signals, events are automatically reactive
 			
 			wsClient.connect();
 		}
@@ -105,17 +102,17 @@
 				<Filter class="h-4 w-4 mr-2" />
 				Filters
 			</button>
-			{#if wsClient}
-				<div class="connection-status {$wsClient.state.connected ? 'connected' : $wsClient.state.connecting ? 'connecting' : 'disconnected'}">
-					{#if $wsClient.state.connected}
-						Live Updates
-					{:else if $wsClient.state.connecting}
-						Connecting...
-					{:else}
-						Disconnected
-					{/if}
-				</div>
-			{/if}
+					{#if wsClient}
+			<div class="connection-status {wsClient.state.connected ? 'connected' : wsClient.state.connecting ? 'connecting' : 'disconnected'}">
+				{#if wsClient.state.connected}
+					Live Updates
+				{:else if wsClient.state.connecting}
+					Connecting...
+				{:else}
+					Disconnected
+				{/if}
+			</div>
+		{/if}
 		</div>
 	</div>
 

sveltekit-app/tailwind.config.ts

@@ -1,4 +1,5 @@
-/** @type {import('tailwindcss').Config} */
+import type { Config } from 'tailwindcss'
+
 export default {
   content: ['./src/**/*.{html,js,svelte,ts}'],
   theme: {
@@ -13,5 +14,4 @@ export default {
       }
     },
   },
-  plugins: [],
-}
+} satisfies Config

sveltekit-app/tsconfig.json

@@ -9,6 +9,8 @@
 		"skipLibCheck": true,
 		"sourceMap": true,
 		"strict": true,
-		"moduleResolution": "bundler"
+		"moduleResolution": "bundler",
+		"target": "ES2022",
+		"lib": ["ES2022", "DOM", "DOM.Iterable"]
 	}
 }

sveltekit-app/vite.config.ts

@@ -5,5 +5,8 @@ export default defineConfig({
 	plugins: [sveltekit()],
 	server: {
 		port: 3000
+	},
+	optimizeDeps: {
+		include: ['svelte']
 	}
 });