svelte-typescript

Coding rules for Svelte 5, a web-interface framework, and TypeScript, a language that adds type checking to JavaScript.

In plain words
What is it for?
Building Svelte components and stores, defining typed data structures, styling with Tailwind CSS, and adding keyboard support, focus handling, semantic HTML, and image descriptions.
Why use it?
They standardise component structure, state handling, styling, error states, and accessibility so the interface remains consistent and easier to maintain.

Cursor rule for Cursor

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add rules/chooomedia/keymoji/svelte-typescript
Clone the repo
git clone --depth 1 https://github.com/chooomedia/keymoji

Made for: Cursor.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 475 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.00475
Opus 5 $0.00000 $0.00237
Sonnet 5 $0.00000 $0.00095
Haiku 4.5 $0.00000 $0.00047

Measured yesterday against content hash c82c8a493a47, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

svelte-typescript scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.cursor/rules/svelte-typescript.mdc · 73 lines

What it actually says

Svelte 5 & TypeScript Patterns

Svelte Runes (bevorzugt gegenüber klassischen Stores)

// ✅ GUT: Svelte 5 Runes
let count = $state(0);
let doubled = $derived(count * 2);
$effect(() => console.log(count));

// ⚠️ ALT: nur wenn nötig für Store-Kompatibilität
import { writable } from 'svelte/store';

Komponenten-Struktur (Pflicht-Reihenfolge)

<script lang="ts">
  // 1. Imports
  // 2. TypeScript Interfaces
  // 3. Props mit $props()
  // 4. State mit $state()
  // 5. Derived mit $derived()
  // 6. Effects mit $effect()
  // 7. Functions
</script>

TypeScript Schemas

export interface Account {
  userId: string;
  email: string;
  tier: 'free' | 'pro';
  profile: UserProfile;
  metadata: AccountMetadata;
}

Tailwind CSS

  • NUR Tailwind Utility-Klassen
  • KEINE <style> Tags (Ausnahme: CSS Animationen wie @keyframes)
  • Dark Mode via dark: Klassen
  • Error-States: border-2 border-red-500 dark:border-red-500 bg-red-50 dark:bg-red-950/60

A11y (Pflicht)

  • aria-label für alle Icon-Buttons
  • Keyboard Navigation (onKeydown)
  • Focus Management für Modals (FocusManager.svelte)
  • Semantisches HTML
  • Alt-Text für alle Bilder

Migration Svelte 3 → 5

Alt Neu
writable() $state()
derived() $derived()
$: reaktiv $effect()
export let prop let { prop } = $props()
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. yesterday First seen · 73 lines · 0 tokens per session scan A c82c8a493a47

Subscribe to this mod's changes

svelte-typescript is a cursor rule published in the GitHub repository chooomedia/keymoji (2 stars, last pushed 1mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 475 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.