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README

        

# TypeScript library starter

[![styled with prettier](https://img.shields.io/badge/styled_with-prettier-ff69b4.svg)](https://github.com/prettier/prettier)
[![Greenkeeper badge](https://badges.greenkeeper.io/alexjoverm/typescript-library-starter.svg)](https://greenkeeper.io/)
[![Travis](https://img.shields.io/travis/alexjoverm/typescript-library-starter.svg)](https://travis-ci.org/alexjoverm/typescript-library-starter)
[![Coveralls](https://img.shields.io/coveralls/alexjoverm/typescript-library-starter.svg)](https://coveralls.io/github/alexjoverm/typescript-library-starter)
[![Dev Dependencies](https://david-dm.org/alexjoverm/typescript-library-starter/dev-status.svg)](https://david-dm.org/alexjoverm/typescript-library-starter?type=dev)
[![Donate](https://img.shields.io/badge/donate-paypal-blue.svg)](https://paypal.me/AJoverMorales)

A starter project that makes creating a TypeScript library extremely easy.

### Usage

```bash
git clone https://github.com/alexjoverm/typescript-library-starter.git YOURFOLDERNAME
cd YOURFOLDERNAME

# Run npm install and write your library name when asked. That's all!
npm install
```

**Start coding!** `package.json` and entry files are already set up for you, so don't worry about linking to your main file, typings, etc. Just keep those files with the same names.

### Features

- Zero-setup. After running `npm install` things will be setup for you :wink:
- **[RollupJS](https://rollupjs.org/)** for multiple optimized bundles following the [standard convention](http://2ality.com/2017/04/setting-up-multi-platform-packages.html) and [Tree-shaking](https://alexjoverm.github.io/2017/03/06/Tree-shaking-with-Webpack-2-TypeScript-and-Babel/).
- Tests, coverage and interactive watch mode using **[Jest](http://facebook.github.io/jest/)**
- **[Prettier](https://github.com/prettier/prettier)** and **[TSLint](https://palantir.github.io/tslint/)** for code formatting and consistency.
- **Docs automatic generation and deployment** to `gh-pages`, using **[TypeDoc](http://typedoc.org/)**
- Automatic types `(*.d.ts)` file generation
- **[Travis](https://travis-ci.org)** integration and **[Coveralls](https://coveralls.io/)** report
- (Optional) **Automatic releases and changelog**, using [Semantic release](https://github.com/semantic-release/semantic-release), [Commitizen](https://github.com/commitizen/cz-cli), [Conventional changelog](https://github.com/conventional-changelog/conventional-changelog) and [Husky](https://github.com/typicode/husky) (for the git hooks)

### Excluding peerDependencies

On library development, one might want to set some peer dependencies, and thus remove those from the final bundle. You can see in [Rollup docs](https://rollupjs.org/#peer-dependencies) how to do that.

The good news is here is setup for you, you only must include the dependency name in `external` property within `rollup.config.js`. For example, if you wanna exclude `lodash`, just write there `external: ['lodash']`.

### NPM scripts

- `npm t`: Run test suite
- `npm start`: Runs `npm run build` in watch mode
- `npm run test:watch`: Run test suite in [interactive watch mode](http://facebook.github.io/jest/docs/cli.html#watch)
- `npm run test:prod`: Run linting and generate coverage
- `npm run build`: Generage bundles and typings, create docs
- `npm run lint`: Lints code
- `npm run commit`: Commit using conventional commit style ([husky](https://github.com/typicode/husky) will tell you to use it if you haven't :wink:)

### Automatic releases

If you'd like to have automatic releases with Semantic Versioning, follow these simple steps.

_**Prerequisites**: you need to create/login accounts and add your project to:_
- npm
- Travis
- Coveralls

Run the following command to prepare hooks and stuff:

```bash
npm run semantic-release-prepare
```

Follow the console instructions to install semantic release run it (answer NO to "Generate travis.yml").

_Note: make sure you've setup `repository.url` in your `package.json` file_

```bash
npm install -g semantic-release-cli
semantic-release setup
# IMPORTANT!! Answer NO to "Generate travis.yml" question. Is already prepared for you :P
```

From now on, you'll need to use `npm run commit`, which is a convenient way to create conventional commits.

Automatic releases are possible thanks to [semantic release](https://github.com/semantic-release/semantic-release), which publishes your code automatically on github and npm, plus generates automatically a changelog. This setup is highly influenced by [Kent C. Dodds course on egghead.io](https://egghead.io/courses/how-to-write-an-open-source-javascript-library)

### Git Hooks

There is already set a `precommit` hook for formatting your code with Prettier :nail_care:

By default, there are 2 disabled git hooks. They're set up when you run the `npm run semantic-release-prepare` script. They make sure:
- You follow a [conventional commit message](https://github.com/conventional-changelog/conventional-changelog)
- Your build is not gonna fail in [Travis](https://travis-ci.org) (or your CI server), since it's runned locally before `git push`

This makes more sense in combination with [automatic releases](#automatic-releases)

### FAQ

#### `Array.prototype.from`, `Promise`, `Map`... is undefined?

TypeScript or Babel only provides down-emits on syntactical features (`class`, `let`, `async/away`...), but not on functional features (`Array.prototype.find`, `Set`, `Promise`...), . For that, you need Polyfills, such as [`core-js`](https://github.com/zloirock/core-js) or [`babel-polyfill`](https://babeljs.io/docs/usage/polyfill/) (which extends `core-js`).

For a library, `core-js` plays very nicely, since you can import just the polyfills you need:

```javascript
import "core-js/fn/array/find"
import "core-js/fn/string/includes"
import "core-js/fn/promise"
...
```

#### What is `npm install` doing the first time runned?

It runs the script `tools/init` which sets up everything for you. In short, it:
- Configures RollupJS for the build, which creates the bundles.
- Configures `package.json` (typings file, main file, etc)
- Renames main src and test files

#### What if I don't want git-hooks, automatic releases or semantic-release?

Then you may want to:
- Remove `commitmsg`, `postinstall` scripts from `package.json`. That will not use those git hooks to make sure you make a conventional commit
- Remove `npm run semantic-release` from `.travis.yml`

#### What if I don't want to use coveralls or report my coverage?

Remove `npm run report-coverage` from `.travis.yml`

## Credits

Made with :heart: by [@alexjoverm](https://twitter.com/alexjoverm) and all these wonderful contributors ([emoji key](https://github.com/kentcdodds/all-contributors#emoji-key)):

| [
Ciro](https://www.linkedin.com/in/ciro-ivan-agullรณ-guarinos-42109376)
[๐Ÿ’ป](https://github.com/alexjoverm/typescript-library-starter/commits?author=k1r0s "Code") [๐Ÿ”ง](#tool-k1r0s "Tools") | [
Marius Schulz](https://blog.mariusschulz.com)
[๐Ÿ“–](https://github.com/alexjoverm/typescript-library-starter/commits?author=mariusschulz "Documentation") | [
Alexander Odell](https://github.com/alextrastero)
[๐Ÿ“–](https://github.com/alexjoverm/typescript-library-starter/commits?author=alextrastero "Documentation") | [
Ryan Ham](https://github.com/superamadeus)
[๐Ÿ’ป](https://github.com/alexjoverm/typescript-library-starter/commits?author=superamadeus "Code") | [
Chi](https://consiiii.me)
[๐Ÿ’ป](https://github.com/alexjoverm/typescript-library-starter/commits?author=ChinW "Code") [๐Ÿ”ง](#tool-ChinW "Tools") [๐Ÿ“–](https://github.com/alexjoverm/typescript-library-starter/commits?author=ChinW "Documentation") | [
Matt Mazzola](https://github.com/mattmazzola)
[๐Ÿ’ป](https://github.com/alexjoverm/typescript-library-starter/commits?author=mattmazzola "Code") [๐Ÿ”ง](#tool-mattmazzola "Tools") | [
Sergii Lischuk](http://leefrost.github.io)
[๐Ÿ’ป](https://github.com/alexjoverm/typescript-library-starter/commits?author=Leefrost "Code") |
| :---: | :---: | :---: | :---: | :---: | :---: | :---: |
| [
Steve Lee](http;//opendirective.com)
[๐Ÿ”ง](#tool-SteveALee "Tools") | [
Flavio Corpa](http://flaviocorpa.com)
[๐Ÿ’ป](https://github.com/alexjoverm/typescript-library-starter/commits?author=kutyel "Code") | [
Dom](https://github.com/foreggs)
[๐Ÿ”ง](#tool-foreggs "Tools") |

This project follows the [all-contributors](https://github.com/kentcdodds/all-contributors) specification. Contributions of any kind welcome!