$state.raw for Non-Reactive State
Store large objects or arrays without deep reactivity for better performance.
$state.raw for Non-Reactive State is a free Sveltejs Academy lesson on CoddyKit — lesson 1 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Sveltejs Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
When Deep Proxy Is Overkill
For very large objects or arrays where you do not need property-level reactivity, deep proxies waste cycles.
Raw State
$state.raw stores the value without wrapping it in a proxy.
let bigData = $state.raw(hugeArray);Reassignment Only
With raw state, only reassignment triggers updates. Mutations are not tracked.
bigData = [...bigData, item]; // triggers
bigData.push(item); // does NOTUse Cases
Large data sets, immutable values, performance-critical paths.
Comparison
Like Svelte 4 let: assignment-only reactivity, no proxy overhead.
When to Choose
Default to $state; switch to $state.raw only when profiling shows proxy cost is significant.
Snapshot Friendly
Raw values are plain — easy to pass through serialization or Web Workers.
Mixed Usage
You can combine raw and proxied state in the same component for different needs.
TypeScript
Raw state preserves your exact type without proxy transformations.
Memory
Raw state uses less memory because no proxy metadata is attached.
Anti-Pattern
Reaching for raw too early can lead to bugs. Start with $state and switch when needed.
Quick Check
What does $state.raw do differently?
Recap
Use $state.raw for large, infrequently-changing values where proxy overhead is not worth it.
Frequently asked questions
Is the “$state.raw for Non-Reactive State” lesson free?
Yes — the full text of “$state.raw for Non-Reactive State” is free to read here on the web, and the Sveltejs Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Sveltejs Academy course, upgrade to CoddyKit PRO.
What will I learn in “$state.raw for Non-Reactive State”?
Store large objects or arrays without deep reactivity for better performance. You practise Sveltejs Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Sveltejs Academy?
No prior experience is required. Sveltejs Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 1 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “$state.raw for Non-Reactive State” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Sveltejs Academy lesson?
Yes. Every Sveltejs Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- $state.raw for Non-Reactive State
- $derived.by for Complex Derivations
- $effect.root for Manual Cleanup
- Migrating from Svelte 4 to 5