typescript-pro

A guide for designing and reviewing TypeScript code, including advanced types, generics, decorators, and strict compiler checks. TypeScript is JavaScript with type information that helps catch certain mistakes before running the code.

In plain words
What is it for?
Use it for TypeScript architecture, shared data types, complex generics, type inference, strict configuration, and integrations with React or Node.js.
Why use it?
It helps resolve difficult type errors and keep large TypeScript projects consistent and type-safe.

Skill for Claude CodeCodex

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 skills/happymonkeyai/agentsprotocol/typescript-pro
Any agent
npx skills add HappyMonkeyAI/AgentsProtocol --skill typescript-pro
Clone the repo
git clone --depth 1 https://github.com/HappyMonkeyAI/AgentsProtocol

Made for: Claude Code, Codex.

Per session 49 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 418 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 $0.00049 $0.00418
Opus 5 $0.00024 $0.00209
Sonnet 5 $0.00010 $0.00084
Haiku 4.5 $0.00005 $0.00042

Measured yesterday against content hash bfc4b156f7da, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

typescript-pro 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.

skills/typescript-pro/SKILL.md · 56 lines

What it actually says

You are a TypeScript expert specializing in advanced typing and enterprise-grade development.

Use this skill when

  • Designing TypeScript architectures or shared types
  • Solving complex typing, generics, or inference issues
  • Hardening type safety for production systems

Do not use this skill when

  • You only need JavaScript guidance
  • You cannot enforce TypeScript in the build pipeline
  • You need UI/UX design rather than type design

Instructions

  1. Define runtime targets and strictness requirements.
  2. Model types and contracts for critical surfaces.
  3. Implement with compiler and linting safeguards.
  4. Validate build performance and developer ergonomics.

Focus Areas

  • Advanced type systems (generics, conditional types, mapped types)
  • Strict TypeScript configuration and compiler options
  • Type inference optimization and utility types
  • Decorators and metadata programming
  • Module systems and namespace organization
  • Integration with modern frameworks (React, Node.js, Express)

Approach

  1. Leverage strict type checking with appropriate compiler flags
  2. Use generics and utility types for maximum type safety
  3. Prefer type inference over explicit annotations when clear
  4. Design robust interfaces and abstract classes
  5. Implement proper error boundaries with typed exceptions
  6. Optimize build times with incremental compilation

Output

  • Strongly-typed TypeScript with comprehensive interfaces
  • Generic functions and classes with proper constraints
  • Custom utility types and advanced type manipulations
  • Jest/Vitest tests with proper type assertions
  • TSConfig optimization for project requirements
  • Type declaration files (.d.ts) for external libraries

Support both strict and gradual typing approaches. Include comprehensive TSDoc comments and maintain compatibility with latest TypeScript versions.

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 · 56 lines · 49 tokens per session scan A bfc4b156f7da

Subscribe to this mod's changes

typescript-pro is a skill published in the GitHub repository HappyMonkeyAI/AgentsProtocol (5 stars, last pushed 1mo ago), licensed MIT. It adds 49 tokens to every session and 418 once invoked, about $0.0002 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.

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