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ts-library

Use when authoring TypeScript libraries - covers project setup, package exports, build tooling (tsdown/unbuild), API design patterns, type inference tricks, testing, and release workflows. Patterns extracted from 20+ high-quality ecosystem libraries.

Published by onmax

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Cloud-native skill

Runs in the cloud

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Dependencies pre-installed

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Secure VM environment

Isolated per task

Works on any device

Desktop, tablet, or phone

Documentation

TypeScript Library Development

Patterns for authoring high-quality TypeScript libraries, extracted from studying unocss, shiki, unplugin, vite, vitest, vueuse, zod, trpc, drizzle-orm, and more.

When to Use

  • Starting a new TypeScript library (single or monorepo)
  • Setting up package.json exports for dual CJS/ESM
  • Configuring tsconfig for library development
  • Choosing build tools (tsdown, unbuild)
  • Designing type-safe APIs (builder, factory, plugin patterns)
  • Writing advanced TypeScript types
  • Setting up vitest for library testing
  • Configuring release workflow and CI

For Nuxt module development: use nuxt-modules skill

Quick Reference

Working on... Load file
New project setup references/project-setup.md
Package exports references/package-exports.md
tsconfig options references/typescript-config.md
Build configuration references/build-tooling.md
API design patterns references/api-design.md
Type inference tricks references/type-patterns.md
Testing setup references/testing.md
Release workflow references/release.md
CI/CD setup references/ci-workflows.md

Key Principles

  • ESM-first: "type": "module" with .mjs outputs
  • Dual format: always support both CJS and ESM consumers
  • moduleResolution: "Bundler" for modern TypeScript
  • tsdown for most builds, unbuild for complex cases
  • Smart defaults: detect environment, don't force config
  • Tree-shakeable: lazy getters, proper sideEffects: false

Token efficiency: Main skill ~300 tokens, each reference ~800-1200 tokens

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Compatible agents

Claude Code

Gemini CLI

Codex

Cursor, Windsurf, Amp

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