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Component Syntax

SFC anatomy Markup expressions If blocks Each blocks Await blocks Class directives Style directives Event handlers

Runes & Reactivity

$state $derived $effect $props $bindable Reactive collections State ownership Deep reactivity

Composition

Props Callback props Bindings Snippets {@render} Context Actions DOM references

Motion & Lifecycle

Mounting tick Transitions Custom transitions Animations Crossfade Motion preferences Browser-only code

SvelteKit Routing

File-based routes Layouts Load functions Form actions Server routes Error pages Cookies Environment modules

Production

Server-only modules Validation SSR and hydration Prerendering Adapters Testing Performance budgets Deployment architecture

Svelte 5 / Runes & Reactivity

Deep reactivity

Learn Deep reactivity in Svelte 5 with a dedicated explanation, a concept-specific example, a production caution, and a mastery check.

12 min read • Beginner

svelte-5-016.svelte

svelte

<script>let order=$state({customer:{name:"Mina"}});</script>
<input bind:value={order.customer.name}>

What to watch

Content source & attribution

Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

Deep reactivity Mastery Check →

State ownership