update to svelte 5

package.json

@@ -15,8 +15,8 @@
   },
   "devDependencies": {
     "@sveltejs/adapter-node": "^5.0.0",
-    "@sveltejs/kit": "^2.0.0",
-    "@sveltejs/vite-plugin-svelte": "^3.0.0",
+    "@sveltejs/kit": "^2.7.0",
+    "@sveltejs/vite-plugin-svelte": "^4.0.0",
     "@types/node": "^22.6.1",
     "@types/sqlite3": "^3.0.0",
     "@types/ws": "^8.5.0",
@@ -25,12 +25,12 @@
     "@zerodevx/svelte-toast": "^0.9.3",
     "eslint": "^9.11.1",
     "eslint-config-prettier": "^9.0.0",
-    "eslint-plugin-svelte": "^2.0.0",
-    "prettier": "^3.0.0",
-    "prettier-plugin-svelte": "^3.0.0",
-    "svelte": "^4.0.0",
+    "eslint-plugin-svelte": "^2.45.1",
+    "prettier": "^3.1.0",
+    "prettier-plugin-svelte": "^3.2.6",
+    "svelte": "^5",
     "svelte-check": "^4.0.0",
-    "tslib": "^2.4.1",
+    "tslib": "^2.0.0",
     "typescript": "^5.0.0",
     "vite": "^5.0.0"
   },

src/lib/components/AccountComponent.svelte

@@ -1,7 +1,11 @@
 <script lang="ts">
   import type { Account } from '$lib/mastodon/response';
 
-  export let account: Account;
+  interface Props {
+    account: Account;
+  }
+
+  let { account }: Props = $props();
 </script>
 
 <a href={account.url} target="_blank">{account.display_name} @{account.acct}</a>

src/lib/components/AvatarComponent.svelte

@@ -1,11 +1,13 @@
 <script lang="ts">
   import type { Account } from '$lib/mastodon/response';
 
-  export let account: Account;
-  let avatarDescription: string;
-  let sourceSetHtml: string;
-  $: avatarDescription = `Avatar for ${account.acct}`;
-  $: {
+  interface Props {
+    account: Account;
+  }
+
+  let { account }: Props = $props();
+  let avatarDescription: string = $derived(`Avatar for ${account.acct}`);
+  let sourceSetHtml: string = $derived.by(() => {
     // Sort thumbnails by file type. This is important, because the order of the srcset entries matter.
     // We need the best format to be first
     const formatPriority = new Map<string, number>([
@@ -33,8 +35,8 @@
       const srcset = entry[1].join(', ');
       html += `<source srcset="${srcset}" type="${entry[0]}" />`;
     }
-    sourceSetHtml = html;
-  }
+    return html;
+  });
 </script>
 
 <picture>

src/lib/components/LoadMoreComponent.svelte

@@ -1,33 +1,34 @@
 <script lang="ts">
-  import { createEventDispatcher } from 'svelte';
   import LoadingSpinnerComponent from '$lib/components/LoadingSpinnerComponent.svelte';
 
-  export let moreAvailable = false;
-  export let isLoading = false;
-  let displayText = '';
-  let title = '';
-  let disabled: boolean;
-
-  $: if (isLoading) {
-    displayText = 'Loading...';
-  } else if (!moreAvailable) {
-    displayText = 'You reached the end';
-  } else {
-    displayText = 'Load More';
+  interface Props {
+    moreAvailable?: boolean;
+    isLoading?: boolean;
+    loadOlderPosts: any;
   }
-  $: disabled = !moreAvailable || isLoading;
-  $: title = moreAvailable ? 'Load More' : 'There be dragons!';
 
-  const dispatch = createEventDispatcher<{
+  let { moreAvailable = false, isLoading = false, loadOlderPosts }: Props = $props();
+  let displayText = $derived.by(() => {
+    if (isLoading) {
+      return 'Loading...';
+    } else if (!moreAvailable) {
+      return 'You reached the end';
+    }
+    return 'Load More';
+  });
+  let title = $derived(moreAvailable ? 'Load More' : 'There be dragons!');
+  let disabled: boolean = $derived(!moreAvailable || isLoading);
+
+  /*const dispatch = createEventDispatcher<{
   loadOlderPosts: string;
 }>();
 
 function loadOlderPosts() {
   dispatch('loadOlderPosts');
-  }
+}*/
 </script>
 
-<button on:click={loadOlderPosts} {disabled} {title}>
+<button onclick={() => loadOlderPosts()} {disabled} {title}>
   <div class="loading" class:collapsed={!isLoading}>
     <LoadingSpinnerComponent size="0.5em" thickness="6px" />
   </div>

src/lib/components/LoadingSpinnerComponent.svelte

@@ -1,9 +1,13 @@
 <script lang="ts">
-  export let size = '64px';
-  export let thickness = '6px';
+  interface Props {
+    size?: string;
+    thickness?: string;
+  }
+
+  let { size = '64px', thickness = '6px' }: Props = $props();
 </script>
 
-<div class="lds-dual-ring" style="--size: {size}; --thickness: {thickness}" />
+<div class="lds-dual-ring" style="--size: {size}; --thickness: {thickness}"></div>
 
 <style>
   .lds-dual-ring {

src/lib/components/PostComponent.svelte

@@ -6,15 +6,21 @@
   import { secondsSince, relativeTime } from '$lib/relativeTime';
   import { onMount } from 'svelte';
 
-  export let post: Post;
-  let displayRelativeTime = false;
-  const absoluteDate = new Date(post.created_at).toLocaleString();
-  let dateCreated = absoluteDate;
-  const timePassed = secondsSince(new Date(post.created_at));
-  $: if (displayRelativeTime) {
-    dateCreated = relativeTime($timePassed) ?? absoluteDate;
+  interface Props {
+    post: Post;
   }
 
+  let { post }: Props = $props();
+  let displayRelativeTime = $state(false);
+  const absoluteDate = new Date(post.created_at).toLocaleString();
+  const timePassed = secondsSince(new Date(post.created_at));
+  let dateCreated = $derived.by(() => {
+    if (displayRelativeTime) {
+      return relativeTime($timePassed) ?? absoluteDate;
+    }
+    return absoluteDate;
+  });
+
   const songs = filterDuplicates(post.songs ?? []);
 
   function filterDuplicates(songs: SongInfo[]): SongInfo[] {

src/routes/+layout.svelte

@@ -1,6 +1,11 @@
 <script lang="ts">
   import FooterComponent from '$lib/components/FooterComponent.svelte';
   import { SvelteToast } from '@zerodevx/svelte-toast';
+  interface Props {
+    children?: import('svelte').Snippet;
+  }
+
+  let { children }: Props = $props();
 
   const options = {
     pausable: true,
@@ -8,7 +13,7 @@
   };
 </script>
 
-<slot />
+{@render children?.()}
 <SvelteToast {options} />
 <div class="footer">
   <FooterComponent />

src/routes/+page.svelte

@@ -12,7 +12,11 @@
   import { cubicInOut } from 'svelte/easing';
   import { errorToast } from '$lib/errorToast';
 
-  export let data: PageData;
+  interface Props {
+    data: PageData;
+  }
+
+  let { data = $bindable() }: Props = $props();
 
   interface FetchOptions {
     since?: string;
@@ -26,8 +30,8 @@
 
   const refreshInterval = parseInt(PUBLIC_REFRESH_INTERVAL);
   let interval: ReturnType<typeof setTimeout> | null = null;
-  let moreOlderPostsAvailable = true;
-  let loadingOlderPosts = false;
+  let moreOlderPostsAvailable = $state(true);
+  let loadingOlderPosts = $state(false);
 
   // Needed, so that edgeFly() can do its thing:
   // To determine whether a newly loaded post is older than the existing ones, is required to know what the oldest
@@ -152,7 +156,7 @@
 </svelte:head>
 <h2>{PUBLIC_MASTODON_INSTANCE_DISPLAY_NAME} music list</h2>
 <div class="wrapper">
-  <div />
+  <div></div>
   <div class="posts">
     {#if data.posts.length === 0}
       Sorry, no posts recommending music have been found yet
@@ -171,12 +175,12 @@
       </div>
     {/each}
     <LoadMoreComponent
-      on:loadOlderPosts={loadOlderPosts}
+      {loadOlderPosts}
       moreAvailable={moreOlderPostsAvailable}
       isLoading={loadingOlderPosts}
     />
   </div>
-  <div />
+  <div></div>
 </div>
 
 <style>