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svelte5

svelte5

github.com/trevorsDevelopment39 installs
Repository

About svelte5

A reference skill for developers writing Svelte components with Svelte 5. It maps common Svelte 4 patterns to runes and points to focused references for TypeScript, patterns, and gotchas.

Key features

  1. 01Svelte 4からSvelte 5への書き換え例
  2. 02$props、$state、$derivedの使い方
  3. 03イベントとスニペットの構文
  4. 04TypeScriptや注意点の参照資料

Use cases

  1. 01既存コンポーネントのSvelte 5移行
  2. 02新規コンポーネントでrun​​esを使用
  3. 03型付けやリアクティビティの確認

Install

Copy the command and run it in a terminal.

$npx skills add https://github.com/trevors/dot-claude --skill svelte5

After installing, type/svelte5in Claude Code to confirm it loaded.

Bundled files

References and scripts installed along with SKILL.md.

gotchas.md
patterns.md
typescript.md

Details

From the project README

Svelte 5 Syntax

Always use Svelte 5 runes. Never use Svelte 4 patterns.

Svelte 4 → Svelte 5

Svelte 4 ❌Svelte 5 ✅
export let foolet { foo } = $props()
export let foo = 'default'let { foo = 'default' } = $props()
$: doubled = x * 2let doubled = $derived(x * 2)
$: { sideEffect() }$effect(() => { sideEffect() })
on:click={handler}onclick={handler}
on:input={handler}oninput={handler}
on:click|preventDefault={h}onclick={e => { e.preventDefault(); h(e) }}
<slot />{@render children()}
<slot name="x" />{@render x?.()}
$$propsUse $props() with rest: let { ...rest } = $props()
$$restPropslet { known, ...rest } = $props()
createEventDispatcher()Pass callback props: let { onchange } = $props()

Stores → Runes

Svelte 4 ❌Svelte 5 ✅
import { writable } from 'svelte/store'Remove import
const count = writable(0)let count = $state(0)
$count (auto-subscribe)count (direct access)
count.set(1)count = 1
count.update(n => n + 1)count += 1

Quick Reference

<script>
  // Props (with defaults and rest)
  let { required, optional = 'default', ...rest } = $props();

  // Two-way bindable prop
  let { value = $bindable() } = $props();

  // Reactive state
  let count = $state(0);
  let items = $state([]);      // arrays are deeply reactive
  let user = $state({ name: '' }); // objects too

  // Derived values
  let doubled = $derived(count * 2);
  let complex = $derived.by(() => {
    // multi-line logic here
    return expensiveCalc(count);
  });

  // Side effects
  $effect(() => {
    console.log(count);
    return () => cleanup(); // optional cleanup
  });
</script>

<!-- Events: native names, no colon -->
<button onclick={() => count++}>Click</button>
<input oninput={e => value = e.target.value} />

<!-- Render snippets (replaces slots) -->
{@render children?.()}

Snippets (Replace Slots)

<!-- Parent passes snippets -->
<Dialog>
  {#snippet header()}
    <h1>Title</h1>
  {/snippet}

  {#snippet footer(close)}
    <button onclick={close}>Done</button>
  {/snippet}
</Dialog>

<!-- Child renders them -->
<script>
  let { header, footer, children } = $props();
</script>
{@render header?.()}
{@render children?.()}
{@render footer?.(() => open = false)}

References

Load these when needed:

Comments

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