feat: add Svelte 5 runes

content/1-reactivity/1-declare-state/svelte5/Name.svelte

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+<script>
+  let name = $state("John");
+</script>
+
+<h1>Hello {name}</h1>

content/1-reactivity/2-update-state/svelte5/Name.svelte

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+<script>
+  let name = $state("John");
+  name = "Jane";
+</script>
+
+<h1>Hello {name}</h1>

content/1-reactivity/3-computed-state/svelte5/DoubleCount.svelte

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+<script>
+  let count = $state(10);
+  const doubleCount = $derived(count * 2);
+</script>
+
+<div>{doubleCount}</div>

content/2-templating/2-styling/svelte5/CssStyle.svelte

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+<h1 class="title">I am red</h1>
+<button style="font-size: 10rem;">I am a button</button>
+
+<style>
+  .title {
+    color: red;
+  }
+</style>

content/2-templating/3-loop/svelte5/Colors.svelte

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+<script>
+  const colors = ["red", "green", "blue"];
+</script>
+
+<ul>
+  {#each colors as color (color)}
+    <li>{color}</li>
+  {/each}
+</ul>

content/2-templating/4-event-click/svelte5/Counter.svelte

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+<script>
+  let count = $state(0);
+
+  function incrementCount() {
+    count++;
+  }
+</script>
+
+<p>Counter: {count}</p>
+<button on:click={incrementCount}>+1</button>

content/2-templating/5-dom-ref/svelte5/InputFocused.svelte

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+<script>
+  let inputElement;
+
+  $effect(() => {
+    inputElement.focus();
+  });
+</script>
+
+<input bind:this={inputElement} />

content/2-templating/6-conditional/svelte5/TrafficLight.svelte

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+<script>
+  const TRAFFIC_LIGHTS = ["red", "orange", "green"];
+  let lightIndex = $state(0);
+
+  const light = $derived(TRAFFIC_LIGHTS[lightIndex]);
+
+  function nextLight() {
+    lightIndex = (lightIndex + 1) % TRAFFIC_LIGHTS.length;
+  }
+</script>
+
+<button on:click={nextLight}>Next light</button>
+<p>Light is: {light}</p>
+<p>
+  You must
+  {#if light === "red"}
+    <span>STOP</span>
+  {:else if light === "orange"}
+    <span>SLOW DOWN</span>
+  {:else if light === "green"}
+    <span>GO</span>
+  {/if}
+</p>

content/3-lifecycle/1-on-mount/svelte5/PageTitle.svelte

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+<script>
+  let pageTitle = "";
+  $effect(() => {
+    pageTitle = document.title;
+  });
+</script>
+
+<p>Page title is: {pageTitle}</p>

content/3-lifecycle/2-on-unmount/svelte5/Time.svelte

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+<script>
+  let time = $state(new Date().toLocaleTimeString());
+
+  $effect(() => {
+    const timer = setInterval(() => {
+      time = new Date().toLocaleTimeString();
+    }, 1000);
+
+    return () => clearInterval(timer);
+  });
+</script>
+
+<p>Current time: {time}</p>

content/4-component-composition/1-props/svelte5/App.svelte

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+<script>
+  import UserProfile from "./UserProfile.svelte";
+</script>
+
+<UserProfile
+  name="John"
+  age={20}
+  favouriteColors={["green", "blue", "red"]}
+  isAvailable
+/>

content/4-component-composition/1-props/svelte5/UserProfile.svelte

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+<script>
+  const {
+    name = "",
+    age = null,
+    favouriteColors = [],
+    isAvailable = false,
+  } = $props();
+</script>
+
+<p>My name is {name}!</p>
+<p>My age is {age}!</p>
+<p>My favourite colors are {favouriteColors.join(", ")}!</p>
+<p>I am {isAvailable ? "available" : "not available"}</p>

content/4-component-composition/2-emit-to-parent/svelte5/AnswerButton.svelte

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+<script>
+  import { createEventDispatcher } from "svelte";
+
+  const dispatch = createEventDispatcher();
+
+  function clickYes() {
+    dispatch("yes");
+  }
+
+  function clickNo() {
+    dispatch("no");
+  }
+</script>
+
+<button on:click={clickYes}> YES </button>
+
+<button on:click={clickNo}> NO </button>

content/4-component-composition/2-emit-to-parent/svelte5/App.svelte

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+<script>
+  import AnswerButton from "./AnswerButton.svelte";
+
+  let isHappy = $state(true);
+
+  function onAnswerNo() {
+    isHappy = false;
+  }
+
+  function onAnswerYes() {
+    isHappy = true;
+  }
+</script>
+
+<p>Are you happy?</p>
+<AnswerButton on:yes={onAnswerYes} on:no={onAnswerNo} />
+<p style="font-size: 50px;">{isHappy ? "😀" : "😥"}</p>

content/4-component-composition/3-slot/svelte5/App.svelte

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+<script>
+  import FunnyButton from "./FunnyButton.svelte";
+</script>
+
+<FunnyButton>Click me!</FunnyButton>

content/4-component-composition/3-slot/svelte5/FunnyButton.svelte

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+<button
+  style="background: rgba(0, 0, 0, 0.4); color: #fff; padding: 10px 20px; font-size: 30px; border: 2px solid #fff; margin: 8px; transform: scale(0.9); box-shadow: 4px 4px rgba(0, 0, 0, 0.4); transition: transform 0.2s cubic-bezier(0.34, 1.65, 0.88, 0.925) 0s; outline: 0;"
+>
+  <slot />
+</button>

content/4-component-composition/4-slot-fallback/svelte5/App.svelte

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+<script>
+  import FunnyButton from "./FunnyButton.svelte";
+</script>
+
+<FunnyButton />
+<FunnyButton>I got content!</FunnyButton>

content/4-component-composition/4-slot-fallback/svelte5/FunnyButton.svelte

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+<button
+  style="background: rgba(0, 0, 0, 0.4); color: #fff; padding: 10px 20px; font-size: 30px; border: 2px solid #fff; margin: 8px; transform: scale(0.9); box-shadow: 4px 4px rgba(0, 0, 0, 0.4); transition: transform 0.2s cubic-bezier(0.34, 1.65, 0.88, 0.925) 0s; outline: 0;"
+>
+  <slot>
+    <span>No content found</span>
+  </slot>
+</button>

content/4-component-composition/5-context/svelte5/App.svelte

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+<script>
+  import { setContext } from "svelte";
+  import UserProfile from "./UserProfile.svelte";
+  import createUserState from "./createUserState.js";
+
+  // In a real app, you would fetch the user data from an API
+  const user = createUserState({
+    id: 1,
+    username: "unicorn42",
+    email: "[email protected]",
+  });
+
+  setContext("user", user);
+</script>
+
+<h1>Welcome back, {user.value.username}</h1>
+<UserProfile />

content/4-component-composition/5-context/svelte5/UserProfile.svelte

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+<script>
+  import { getContext } from "svelte";
+
+  const user = getContext("user");
+</script>
+
+<div>
+  <h2>My Profile</h2>
+  <p>Username: {user.value.username}</p>
+  <p>Email: {user.value.email}</p>
+  <button on:click={() => user.updateUsername("Jane")}>
+    Update username to Jane
+  </button>
+</div>

content/4-component-composition/5-context/svelte5/createUserState.js

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+export default function createUserState(initial) {
+  let user = $state(initial);
+  return {
+    get value() {
+      return user;
+    },
+    updateUsername(newUsername) {
+      user = {
+        ...user,
+        username: newUsername,
+      };
+    },
+  };
+}

content/6-form-input/1-input-text/svelte5/InputHello.svelte

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+<script>
+  let text = $state("Hello World");
+</script>
+
+<p>{text}</p>
+<input bind:value={text} />

content/6-form-input/2-checkbox/svelte5/IsAvailable.svelte

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+<script>
+  let isAvailable = $state(false);
+</script>
+
+<input id="is-available" type="checkbox" bind:checked={isAvailable} />
+<label for="is-available">Is available</label>

content/6-form-input/3-radio/svelte5/PickPill.svelte

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+<script>
+  let picked = $state("red");
+</script>
+
+<div>Picked: {picked}</div>
+
+<input id="blue-pill" bind:group={picked} type="radio" value="blue" />
+<label for="blue-pill">Blue pill</label>
+
+<input id="red-pill" bind:group={picked} type="radio" value="red" />
+<label for="red-pill">Red pill</label>

content/6-form-input/4-select/svelte5/ColorSelect.svelte

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+<script>
+  let selectedColorId = $state(2);
+
+  const colors = [
+    { id: 1, text: "red" },
+    { id: 2, text: "blue" },
+    { id: 3, text: "green" },
+    { id: 4, text: "gray", isDisabled: true },
+  ];
+</script>
+
+<select bind:value={selectedColorId}>
+  {#each colors as color}
+    <option value={color.id} disabled={color.isDisabled}>
+      {color.text}
+    </option>
+  {/each}
+</select>

content/7-webapp-features/1-render-app/svelte4/App.svelte

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+<h1>Hello world</h1>

content/7-webapp-features/1-render-app/svelte5/App.svelte

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+<h1>Hello world</h1>

content/7-webapp-features/1-render-app/svelte5/app.js

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+import App from "./App.svelte";
+
+const app = new App({
+  target: document.getElementById("app"),
+});
+
+export default app;

content/7-webapp-features/1-render-app/svelte5/index.html

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+<!doctype html>
+<html>
+  <body>
+    <div id="app"></div>
+    <script type="module" src="./app.js"></script>
+  </body>
+</html>

content/7-webapp-features/2-fetch-data/svelte5/App.svelte

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+<script>
+  import useFetchUsers from "./useFetchUsers";
+
+  const response = useFetchUsers();
+</script>
+
+{#if response.isLoading}
+  <p>Fetching users...</p>
+{:else if response.error}
+  <p>An error occured while fetching users</p>
+{:else if response.users}
+  <ul>
+    {#each response.users as user}
+      <li>
+        <img src={user.picture.thumbnail} alt="user" />
+        <p>
+          {user.name.first}
+          {user.name.last}
+        </p>
+      </li>
+    {/each}
+  </ul>
+{/if}

content/7-webapp-features/2-fetch-data/svelte5/useFetchUsers.js

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+export default function useFetchUsers() {
+  const users = $state();
+  const error = $state();
+  const isLoading = $state(false);
+
+  async function fetchData() {
+    isLoading = true;
+    try {
+      const response = await fetch("https://randomuser.me/api/?results=3");
+      users = (await response.json()).results;
+    } catch (err) {
+      error = err;
+    }
+    isLoading = false;
+  }
+  fetchData();
+
+  return {
+    get isLoading() {
+      return isLoading;
+    },
+    get error() {
+      return error;
+    },
+    get users() {
+      return users;
+    },
+  };
+}

content/7-webapp-features/3-router-link/svelte5/sveltekit.md

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+With <a href="https://kit.svelte.dev/docs/routing#pages">SvelteKit</a>
+
+```svelte
+<ul>
+  <li>
+    <a href="/">Home</a>
+  </li>
+  <li>
+    <a href="/about">About us</a>
+  </li>
+</ul>
+```

content/7-webapp-features/4-routing/svelte5/sveltekit.md

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+With <a href="https://kit.svelte.dev/docs/routing#pages">SvelteKit</a>
+
+```
+|-- routes/
+    |-- +page.svelte // index page "/"
+    |-- about/
+        |-- +page.svelte // about page "/about"
+    |-- +error.svelte // handle HTTP errors 404, 500,...
+    |-- +layout.svelte // global app layout
+```