typescript

USE WHEN: Defining TypeScript types, Zod schemas, and generic constraints for type safety.

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/omergulcicek/omergulcicek.com/typescript
Clone the repo
git clone --depth 1 https://github.com/omergulcicek/omergulcicek.com

Made for: Cursor.

Per session 0 Nothing until a file matches its globs; then the whole rule loads.
When invoked 354 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 86% copy Near-identical to another mod 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 $0.00354
Opus 5 $0.00000 $0.00177
Sonnet 5 $0.00000 $0.00071
Haiku 4.5 $0.00000 $0.00035

Measured yesterday against content hash bcddb5b5a0aa, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

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.

Origin

This is a copy

86% identical to typescript — 16 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.cursor/rules/typescript.mdc · 47 lines

What it actually says

TypeScript

Constraints

  • Zod-First: Write Zod schemas for API/Domain contracts. Derive types via z.infer.
  • Strict: Operate in strict: true mode.
  • Arrays: Use T[]. Use Array<T> only for nested types.
  • Enums: Use z.enum or as const objects. Native enum is forbidden.
  • Immutability: Use readonly or as const.
  • Return Types: Explicitly define return types for exported functions.
  • Generics: Use constraints (T extends object).

Bans

  • any.
  • as Type (except in tests).
  • ! (Non-null assertion).
  • Using Interface and Type simultaneously.
  • I or T prefixes (IUser).
  • Type soup (Pick<Omit<Partial<...>>>).
  • Type soup (Pick<Omit<Partial<...>>> nesting > 2). Exception: Deriving Form schemas from API schemas using Zod's .pick(), .omit(), or .extend() is encouraged to maintain SSOT.

Correct Implementation

Incorrect Implementation

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 · 47 lines · 0 tokens per session scan A bcddb5b5a0aa

Subscribe to this mod's changes

typescript is a cursor rule published in the GitHub repository omergulcicek/omergulcicek.com (15 stars, last pushed 7d ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 354 tokens. A static security scan graded it A with 0 findings. It is 86% identical to typescript, differing in 16 lines, and is treated as a copy.