使用方法
- 复制安装命令，在自己的智能体环境安装前先检查源码包。
- 从原始文档核对所需工具、凭据和支持的宿主。
- 说明输入材料与期望交付物，并对照来源检查输出。
npx skills add https://github.com/ejirocodes/agent-skills --skill svelte5-best-practices开始前需了解
- 安装不包含模型订阅、API 额度或访问文件的权限。
- 仓库星数和安装量反映活跃情况，不等于独立质量或安全测试。
仓库原始内容
按源仓库内容呈现，保留标题、案例、代码、表格、链接以及原文引用的演示图片。
Svelte 5 Best Practices
Quick Reference
| Topic | When to Use | Reference |
|---|---|---|
| Runes | $state, $derived, $effect, $props, $bindable, $inspect | runes.md |
| Snippets | Replacing slots, {#snippet}, {@render} | snippets.md |
| Events | onclick handlers, callback props, context API | events.md |
| TypeScript | Props typing, generic components | typescript.md |
| Migration | Svelte 4 to 5, stores to runes | migration.md |
| SvelteKit | Load functions, form actions, SSR, page typing | sveltekit.md |
| Performance | Universal reactivity, avoiding over-reactivity, streaming | performance.md |
Essential Patterns
Reactive State
svelte
<script>
let count = $state(0); // Reactive state
let doubled = $derived(count * 2); // Computed value
</script>Component Props
svelte
<script>
let { name, count = 0 } = $props();
let { value = $bindable() } = $props(); // Two-way binding
</script>Snippets (replacing slots)
svelte
<script>
let { children, header } = $props();
</script>
{@render header?.()}
{@render children()}Event Handlers
svelte
<!-- Svelte 5: use onclick, not on:click -->
<button onclick={() => count++}>Click</button>Callback Props (replacing createEventDispatcher)
svelte
<script>
let { onclick } = $props();
</script>
<button onclick={() => onclick?.({ data })}>Click</button>Common Mistakes
- Using `let` without `$state` - Variables are not reactive without
$state() - Using `$effect` for derived values - Use
$derivedinstead - Using `on:click` syntax - Use
onclickin Svelte 5 - Using `createEventDispatcher` - Use callback props instead
- Using `<slot>` - Use snippets with
{@render} - Forgetting `$bindable()` - Required for
bind:to work - Setting module-level state in SSR - Causes cross-request leaks
- Sequential awaits in load functions - Use
Promise.allfor parallel requests
