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0.0.32 • Public • Published

TypeScript library starter

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



# 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.


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 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
  • 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 will tell you to use it if you haven't 😉)

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:

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

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, 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

Git Hooks

There is already set a precommit hook for formatting your code with Prettier 💅

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:

This makes more sense in combination with automatic releases


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 or babel-polyfill (which extends core-js).

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

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


Made with ❤️ by @alexjoverm and all these wonderful contributors (emoji key):


💻 🔧

Marius Schulz


Alexander Odell


Ryan Ham



💻 🔧 📖

Matt Mazzola

💻 🔧

Sergii Lischuk


Steve Lee


Flavio Corpa




This project follows the all-contributors specification. Contributions of any kind welcome!




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