typescript-strict

A set of rules for writing TypeScript with strict type checking, which makes the compiler catch more possible mistakes.

In plain words
What is it for?
Use it when configuring TypeScript and writing public functions or object shapes, particularly when choosing between unknown, interfaces, and inferred types.
Why use it?
It reduces unclear or unsafe types by requiring explicit contracts and avoiding the catch-all any type.

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/danielcinome/rulix/typescript-strict
Clone the repo
git clone --depth 1 https://github.com/danielcinome/rulix

Made for: Cursor.

Per session 72 This file is loaded in full into every session.
When invoked 72 The same file — it is already loaded in full.
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 $0.00072 $0.00072
Opus 5 $0.00036 $0.00036
Sonnet 5 $0.00014 $0.00014
Haiku 4.5 $0.00007 $0.00007

Measured yesterday against content hash e5d59754679c, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

typescript-strict 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.

tests/fixtures/cursor/.cursor/rules/typescript-strict.mdc · 12 lines

What it actually says

TypeScript Conventions

  • Always use strict: true in tsconfig
  • Never use any — prefer unknown with type narrowing
  • Use explicit return types on public functions
  • Prefer interface over type for object shapes
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 · 12 lines · 72 tokens per session scan A e5d59754679c

Subscribe to this mod's changes

typescript-strict is a cursor rule published in the GitHub repository danielcinome/rulix (2 stars, last pushed 6mo ago), licensed MIT. It adds 72 tokens to every session, about $0.0004 per session on Opus 5. 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.