typescript

A coding command that applies stated TypeScript conventions to new code, refactoring, or review. TypeScript is JavaScript with added checks for the kinds of values code can use.

In plain words
What is it for?
Writing or reviewing TypeScript, converting JavaScript, and setting up TypeScript code with strict checks, typed functions, interfaces, generics, immutable values, and clear naming.
Why use it?
It helps catch missing or incorrect types, unsafe null handling, inconsistent names, and less maintainable code. It also gives a consistent style for common TypeScript patterns.

Command for Claude Code

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 commands/usrrname/cursorrules/typescript
Clone the repo
git clone --depth 1 https://github.com/usrrname/cursorrules

Made for: Claude Code.

Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 285 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 $0.00285
Opus 5 $0.00000 $0.00143
Sonnet 5 $0.00000 $0.00057
Haiku 4.5 $0.00000 $0.00028

Measured yesterday against content hash 4d114eeec5be, 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.

.claude/commands/typescript.md · 69 lines

What it actually says

/typescript

Apply TypeScript best practices and coding standards.

Usage

/typescript [file-or-code]

When to Invoke

Use this command when:

  • Writing new TypeScript code
  • Refactoring JavaScript to TypeScript
  • Reviewing TypeScript for quality issues
  • Setting up TypeScript configuration

Standards Applied

Type Safety

  • Strict mode enforcement
  • No implicit any
  • Explicit return types
  • Proper null checks

Naming

  • PascalCase for types/interfaces
  • camelCase for functions/variables
  • UPPER_SNAKE_CASE for constants

Patterns

  • Interface over type for objects
  • Discriminated unions for state
  • Generics for reusable code
  • Readonly for immutability

Examples

Input

function getData(id) {
  return fetch('/api/' + id);
}

Output

interface Data {
  id: string;
  value: number;
}

async function getData(id: string): Promise<Data | null> {
  const response = await fetch(`/api/${id}`);
  if (!response.ok) return null;
  return response.json();
}

Agent

Uses BasicBitch for reliable TypeScript implementation.

  • /react - React TypeScript patterns
  • /vue3 - Vue TypeScript integration
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 · 69 lines · 0 tokens per session scan A 4d114eeec5be

Subscribe to this mod's changes

typescript is a command published in the GitHub repository usrrname/cursorrules (10 stars, last pushed 4mo ago), licensed ISC. It costs nothing until one of its globs matches a file; then it loads 285 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.