React Native TypeScript Library Starter

A modern, production-ready starter for building React Native TypeScript libraries. Ships with dual CJS/ESM output, full test coverage, and AI-ready project conventions out of the box.

---

What's new in 2.1.0

• Interactive setup wizard — run npm run setup after cloning to configure your library name, author, repo URLs, license, and keywords step by step. Validates every field, shows a preview, and writes all files in one go.
• Husky v9 — hooks migrated to the v9 format. Git hooks now install automatically on npm install with no extra step.

See the full CHANGELOG for all changes including the 2.0.0 redesign.

---

Features

• react-native-builder-bob — dual CJS + ESM + TypeScript declarations
• Strict TypeScript — noImplicitAny, strictNullChecks, noUnusedLocals
• Jest + @testing-library/react-native — full test suite with coverage thresholds
• ESLint + Prettier — consistent code style, enforced on commit via lint-staged
• Husky v9 + commitlint — conventional commit enforcement, hooks install on npm install
• GitHub Actions — CI pipeline (typecheck + lint + test + build)
• AI-Ready — AGENTS.md, Cursor rules, and full TSDoc on every export
• Interactive setup wizard — npm run setup to configure your library in 60 seconds
• Example component and hook — reference implementations to clone from

---

Quick Start

1. Clone and install

git clone https://github.com/WrathChaos/react-native-typescript-library-starter.git my-library
cd my-library
npm install

2. Set up git hooks

Git hooks are installed automatically when you run npm install (via the prepare script). No extra step needed.

3. Configure the library

Run the interactive setup wizard. It walks through every field one by one, shows a preview of all planned changes, and asks for confirmation before writing anything:

npm run setup

The wizard will ask for:

• Package name — your npm name (e.g. react-native-my-library)
• Description — one sentence
• GitHub username / org — used to build repo URLs automatically
• GitHub repository name — defaults to your package name
• Author name & email
• License — MIT, Apache-2.0, ISC, GPL-3.0, or Unlicensed
• Keywords — optional, comma-separated extras

After confirmation it updates package.json, README.md, AGENTS.md, and CONTRIBUTING.md in one go.

4. Replace the example code

The src/ folder contains a fully-typed example component and hook. Use them as reference, then replace with your own:

src/
├── components/MyComponent/   → replace with your component
├── hooks/useMyHook.ts        → replace with your hook
└── index.ts                  → update exports

5. Build and verify

npm run build      # outputs to lib/
npm run typecheck  # type-check without emitting
npm test           # run the test suite

---

Project Structure

react-native-typescript-library-starter/
├── src/                          # ALL source code
│   ├── index.ts                  # Public API entry point
│   ├── components/
│   │   └── MyComponent/
│   │       ├── MyComponent.tsx
│   │       ├── MyComponent.types.ts
│   │       └── index.ts
│   ├── hooks/
│   │   └── useMyHook.ts
│   ├── types/
│   │   └── index.ts
│   └── __tests__/
│       ├── MyComponent.test.tsx
│       └── useMyHook.test.ts
├── lib/                          # Generated by bob (git-ignored)
├── .github/workflows/
│   ├── ci.yml                    # PR checks
│   └── release.yml               # Publish pipeline
├── AGENTS.md                     # AI agent instructions
├── CONTRIBUTING.md
├── CHANGELOG.md
├── package.json
├── tsconfig.json
├── tsconfig.build.json
└── babel.config.js

---

Scripts

Command	Description
npm run build	Build library to lib/ via bob
npm run typecheck	Type-check without emitting
npm run lint	Run ESLint with colored output and auto-fix
npm run lint:ci	ESLint without spinner (for CI)
npm run prettier	Format source files
npm run prettier:ci	Check formatting (for CI)
npm test	Run Jest tests
npm run test:watch	Jest in watch mode
npm run test:coverage	Jest with coverage report

---

Build Output

react-native-builder-bob produces three output targets inside lib/:

Output	Path	Used by
CommonJS	lib/commonjs/	Node.js, bundlers with require()
ESM	lib/module/	Modern bundlers, tree-shaking
TypeScript	lib/typescript/	Type declarations for consumers

The package.json exports field routes consumers to the correct output automatically.

---

Example Component

import { MyComponent } from "your-library";

export default function App() {
  return (
    <MyComponent
      title="Hello World"
      description="A fully-typed example component."
      enableButton
      buttonText="Tap me"
      onPress={() => console.log("pressed")}
    />
  );
}

MyComponent Props

Prop	Type	Default	Description
title	string	—	Primary title text (required)
description	string	—	Optional description below title
enableButton	boolean	false	Renders an action button
buttonText	string	"Press me"	Button label
onPress	() => void	—	Button press callback
style	StyleProp<ViewStyle>	—	Root container style override
titleStyle	StyleProp<TextStyle>	—	Title text style override
descriptionStyle	StyleProp<TextStyle>	—	Description text style override
buttonStyle	StyleProp<ViewStyle>	—	Button container style override
buttonTextStyle	StyleProp<TextStyle>	—	Button label style override
accessibilityLabel	string	title	Accessibility label for the container
testID	string	"my-component"	Test ID for querying in tests

---

Example Hook

import { useMyHook } from "your-library";

function Counter() {
  const { count, increment, decrement, reset, isAtMax, isAtMin } = useMyHook({
    initialValue: 0,
    max: 10,
    min: 0,
    step: 1,
  });

  return (
    <View>
      <Text>{count}</Text>
      <Button title="+" onPress={increment} disabled={isAtMax} />
      <Button title="-" onPress={decrement} disabled={isAtMin} />
      <Button title="Reset" onPress={reset} />
    </View>
  );
}

useMyHook Options

Option	Type	Default	Description
initialValue	number	0	Starting counter value
max	number	—	Upper bound (no limit if omitted)
min	number	0	Lower bound
step	number	1	Increment/decrement amount

useMyHook Return

Key	Type	Description
count	number	Current counter value
increment	() => void	Increment by step
decrement	() => void	Decrement by step
reset	() => void	Reset to initialValue
isAtMax	boolean	true when count >= max
isAtMin	boolean	true when count <= min

---

Testing

Tests use Jest and @testing-library/react-native.

npm test                 # run all tests
npm run test:coverage    # with coverage report

Coverage thresholds are enforced in package.json:

• Branches: 70%
• Functions / Lines / Statements: 80%

---

Commit Conventions

This project enforces Conventional Commits via commitlint:

feat: add MyButton component
fix: correct accessibility role
test: add boundary cases for useMyHook
docs: update README with new props
chore: upgrade dependencies

---

CI

CI Pipeline (.github/workflows/ci.yml)

Runs on every push and pull request to main:

1. Typecheck — tsc --noEmit
2. Lint — ESLint + Prettier check
3. Test — Jest with coverage
4. Build — bob build (only runs after all checks pass)

---

AI / LLM Usage

This starter is designed to be AI-friendly:

• AGENTS.md — read this file first when working with an AI agent. It contains the full directory map, all runnable commands, conventions, naming rules, and do/don'ts.
• .cursor/rules/library-conventions.mdc — Cursor AI rules that automatically enforce component/hook patterns.
• TSDoc everywhere — every exported function, component, prop, and type has @param, @returns, and @example documentation. This maximises AI autocomplete quality.
• Strict TypeScript — strict mode produces accurate types that AI tools can reason about reliably.
• Conventional Commits — predictable commit history helps AI tools summarize changes and generate release notes.

Using with Cursor

The .cursor/rules/library-conventions.mdc rule is auto-applied to all src/**/*.ts and src/**/*.tsx files. It enforces component structure, hook patterns, and TSDoc requirements.

Using with Claude / ChatGPT

Paste the contents of AGENTS.md into the system prompt or the start of a conversation for best results.

---

Peer Dependencies

"peerDependencies": {
  "react": ">=17.0.0",
  "react-native": ">=0.70.0"
}

---

Contributing

See CONTRIBUTING.md for the full guide.

---

Changelog

See CHANGELOG.md.

---

License

MIT — see LICENSE.

---

Author

FreakyCoder — kurayogun@gmail.com
freakycoder.com