svelte5-best-practices

该 Skill 汇总 Svelte 5 的 runes、snippets、事件处理、TypeScript 类型、SvelteKit 数据加载与表单动作、性能优化及 Svelte 4 到 5 迁移等参考文档，适合在编写、审查或重构 Svelte 组件时查阅，并列出常见错误与推荐写法。

热度 84.18

最近更新 2026-10-19 02:19:58

分类：开发依赖：纯提示词应用场景：代码生成 / 代码审查 / 调试排错 / 概念解释

安装技能

复制下面的话术发给你的 Agent，它会通过 secure-skills 检索并安装该技能。

执行命令安装此 skill： npx secure-skills-cli add ejirocodes/agent-skills/svelte5-best-practices

Metadata

name: svelte5-best-practices
description: Svelte 5 runes, snippets, SvelteKit patterns, and modern best practices for TypeScript and component development. Use when writing, reviewing, or refactoring Svelte 5 components and SvelteKit applications. Triggers on: Svelte components, runes ($state, $derived, $effect, $props, $bindable, $inspect), snippets ({#snippet}, {@render}), event handling, SvelteKit data loading, form actions, Svelte 4 to Svelte 5 migration, store to rune migration, slots to snippets migration, TypeScript props typing, generic components, SSR state isolation, performance optimization, or component testing.
license: MIT
metadata: {"author":"ejirocodes","version":"1.0.0"}

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

<script>
  let count = $state(0);           // Reactive state
  let doubled = $derived(count * 2); // Computed value
</script>

<script>
  let { name, count = 0 } = $props();
  let { value = $bindable() } = $props(); // Two-way binding
</script>

<script>
  let { children, header } = $props();
</script>

{@render header?.()}
{@render children()}

<!-- Svelte 5: use onclick, not on:click -->
<button onclick={() => count++}>Click</button>

<script>
  let { onclick } = $props();
</script>

<button onclick={() => onclick?.({ data })}>Click</button>

Using let without $state - Variables are not reactive without $state()
Using $effect for derived values - Use $derived instead
Using on:click syntax - Use onclick in 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.all for parallel requests