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Contributing to Dinero.js

You want to contribute to Dinero.js, and that's awesome 🎉👍 Thanks for that!

Before you dive in head first, there are a couple of guidelines to follow. Please make sure you read and understand them before you contribute. Note that this isn't set in stone. Polite debate and suggestions are welcome, as long as it's compliant with the code of conduct, and it's done with the best interest of the library and the end-users in mind.

Should I contribute?

Pushing your first contribution can be intimidating. A great way to start is by fixing issues. Find an open and confirmed issue, and open a pull request that fixes it.

Please do:

  • Fix bugs.
  • Improve performance.
  • Refactor with better design patterns.
  • Improve the build process (speed, error handling, deprecations, etc.)
  • Improve the docs (typos, lack of clarity, etc.)

🚫 Please don't:

  • Go against the library's philosophy (immutability, modularity, etc.)
  • Make changes based on personal preferences rather than problem-solving.
  • Develop features that aren't in the scope of the library (if not sure, ask before you code).
  • Introduce breaking changes.

💻 Install

The project relies on Node.js and Yarn. It's also recommended to use Node Version Manager to ensure you're using the right Node.js version.

To get started, clone the project and install the dependencies from your terminal:

git clone
cd dinero.js
yarn install
nvm use

🖥️ Project organization

The project is organized as a monorepo under the packages/ directory.

├── calculator-bigint/
├── calculator-number/
├── core/
├── currencies/
└── dinero.js/

📖 Conventions

The project observes a few rules and conventions when it comes to code. Most of them are automated, but make sure you understand them before submitting changes.

Commit messages

The project follows the conventional commits approach to standardize commit messages, generate the changelog and resolve the next version. It means that all commit messages should be formatted using the following scheme:

type(optional scope): subject

Available types are:

  • build: changes affecting the build system or external dependencies
  • ci: changes to CI configuration files and scripts
  • docs: documentation changes
  • feat: a new feature
  • fix: a bug fix
  • perf: changes improving performance
  • refactor: changes that neither fixes a bug nor adds a feature
  • test: adding or fixing tests
  • style: a linting commit
  • revert: a revert of a previous commit

Pull requests

Pull requests must target main. As with commit messages, pull request titles must follow the conventional commits convention.

Branch organization

The project uses two sorts of long-lived branches:

  • main as the default branch, where the latest version of the project lives
  • vx (where x is a number, for example, v1) to version previous major versions

Pull requests should target the main branch unless fixing critical issues in previous major versions.


The project uses Jest for testing. Every public API should be tested. The project is organized as a monorepo, so you should make sure to watch changes before you start coding so that tests pick up up-to-date dependencies.

yarn watch

You should run tests before you commit, or at least before you open a pull request. Pull requests need to pass all checks to be reviewed, so doing it beforehand will save you time.

yarn test


The project uses Prettier for code formatting and ESLint for linting. Both run automatically when you commit, so you can go ahead and format as you like while writing code; it will be overridden anyway.

If ESLint finds issues it can't fix, you can fix it manually and try committing again.

📚 Documentation

The project lives in the website/ directory. You can run it locally:

yarn website:dev

All documentation files live in website/data/docs/. They use MDX, which is a mix of Markdown and JSX.