TypeScript Advanced Types
The skill gives Claude explanations and code examples for mapped types, generics, conditional types, utility types and template literal types, so you can implement complex type logic in TypeScript cleanly.
What is TypeScript Advanced Types?
TypeScript Advanced Types is a skill for Claude that explains the extended TypeScript type system and illustrates it with code examples. It covers generics with constraints, conditional types including infer, mapped types with key remapping, template literal types and built-in utility types such as Partial, Pick, Omit or Record. Claude draws on it when you write complex type logic or need reusable type helpers.
The skill consists of two files. The main file holds the core concepts, best practices, common pitfalls and notes on compiler performance. A reference file provides detailed patterns, such as a type-safe event emitter and a typed API client. Claude only reads it when the overview is not enough. There is also a small type testing pattern that lets you check whether two types are equal.
It suits developers who build type-safe libraries, API clients, form validation, configuration objects or state management, or who migrate a JavaScript codebase to TypeScript. The skill assumes you already use TypeScript in your project. It contains no scripts and is released under the MIT license.
Who it is for
Developers and teams who already use TypeScript and build type-safe libraries, API clients or configurations with demanding type logic.
Use cases
- You build an internal library and want callers to see an error at compile time when they pass the wrong parameters.
- Your team writes an API client and wants endpoints, parameters and responses typed end to end.
- You migrate a JavaScript codebase to TypeScript and need reusable helper types for configuration and state.
What TypeScript Advanced Types does
Generics with constraints
Shows generic functions with one or more type parameters and constraints via extends, so your components stay flexible while remaining type-safe.
Conditional types and infer
Explains conditional types, distribution over union types and extracting return types with infer, including nested conditions.
Mapped types with key remapping
Builds new types from existing ones, such as readonly or optional variants, getter names via key remapping and filters by property type.
Template literal types
Derives string types from patterns, for example event handler names or every dot path in a nested configuration object.
Type tests and pitfalls
Provides a pattern to check whether two types are equal, plus best practices, common mistakes and advice to keep complex types from slowing the compiler.
Event emitter and API client
The reference file contains detailed examples of a type-safe event emitter and an API client whose endpoints, parameters and responses are typed.
Say this to activate the skill
"Write a mapped type that keeps only the number fields of an interface.""How do I type this API client so each endpoint returns the right response?""Explain why this conditional type distributes over the union.""Build a type that lists every path in this configuration object." Install
npx skills add wshobson/agents --skill typescript-advanced-types
The command installs the original version from the author's repository (Vercel skills CLI, needs Node.js), add -g for all projects. We do not host a copy: updates come straight from the author. Need help with setup? How to install skills →
Checked automatically
- Automated check on 2026-11-08 (revision 4bde316): 2 files in the skill folder read by pattern search. It found no hidden characters, no instructions to override rules, no download-and-run and no access to credentials.
Independent checks on skills.sh, as of 8 Nov 2026
| Gen Agent Trust Hub | Pass |
|---|---|
| Socket | Pass |
| Snyk | Pass |
Good to know
- The repository contains further plugins besides this skill, two of them with hooks. The command selects only this skill, but check what else you pull in from the repository.
- Deeply nested or recursive types can slow down compilation. The skill includes its own advice on this, which is worth following in large projects.
- The check is an automated pattern search, not a security guarantee, and reads the skill folder only. The command always installs the author's current version; later versions have not been reviewed by us.
Frequently asked questions about TypeScript Advanced Types
What is TypeScript Advanced Types?
TypeScript Advanced Types is a skill for Claude that explains advanced TypeScript types with code examples. It covers mapped types, generics, conditional types, template literal types and utility types, along with best practices, common pitfalls and type tests.
How do I install TypeScript Advanced Types?
You install TypeScript Advanced Types with 'npx skills add wshobson/agents --skill typescript-advanced-types'. After that, Claude draws on the skill whenever you work on complex type logic in TypeScript.
Is TypeScript Advanced Types free?
Yes, TypeScript Advanced Types is released under the MIT license. You may use, modify and share the skill free of charge as long as the license notice is kept.
Who is TypeScript Advanced Types for?
TypeScript Advanced Types is for anyone who already uses TypeScript and builds type-safe libraries, API clients, form validation or state management. It also helps with migrating from JavaScript to TypeScript by offering reusable helper types.
What data does TypeScript Advanced Types send?
TypeScript Advanced Types consists of two text files with explanations and code examples and contains no scripts. The skill itself calls no external services. What happens to your code depends on your Claude environment.
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About this skill
TypeScript Advanced Types comes from wshobson and is an open-source project maintained by its author and community.
Author: wshobson / github.com. Source: github.com/wshobson/agents/tree/main/plugins/javascript-typescript/skills/typescript-advanced-types. Licence: MIT.
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