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Contributing Guide

Interested in making GrowthBook better? So are we! This guide should help get you setup with a local development environment so you can make changes, create PRs, and get your code merged.

If you just want to contribute a client library in a new language and not make changes to the app itself, you can skip the instructions here and view https://docs.growthbook.io/lib/build-your-own instead.

Requirements

  • MacOS or Linux (Windows may work too, but we haven't tested it)
  • NodeJS 12.x or 14.x
  • Yarn
  • Python 3.6+ (for the stats engine)
    • scipy
    • numpy
    • pandas
  • Docker (for running MongoDB locally)

Getting started

  1. Fork the project
  2. Clone your forked project by running git clone [email protected]:{ YOUR_USERNAME }/growthbook.git
  3. Run cd growthbook
  4. Run yarn to install dependencies
  5. Install poetry
  6. Run yarn setup to do the initial build
  7. Start MongoDB in Docker
docker run -d -p 27017:27017 --name mongo \
  -e MONGO_INITDB_ROOT_USERNAME=root \
  -e MONGO_INITDB_ROOT_PASSWORD=password \
  mongo
  1. Run yarn dev to start the app in dev mode
  2. Visit http://localhost:3000 in your browser and verify the app is working correctly

Changing Configuration Settings

If you need to change any of the default configuration settings, you can use environment variables:

  • Back-end: cp packages/back-end/.env.example packages/back-end/.env.local
  • Front-end: cp packages/front-end/.env.example packages/front-end/.env.local

Then, edit the .env.local files as needed.

Writing code!

This repository is a monorepo with the following packages:

  • packages/front-end is a Next.js app and contains the full UI of the GrowthBook app.
  • packages/back-end is an Express app and serves as the REST api for the front-end.
  • packages/docs is another Next.js app of our documentation site (https://docs.growthbook.io).
  • packages/sdk-js is our javascript SDK (@growthbook/growthbook on npm)
  • packages/sdk-react is our React SDK (@growthbook/growthbook-react on npm)
  • packages/stats is our Python stats engine (gbstats on PyPi)

Depending on what you're changing, you may need to edit one or more of these packages.

Working on the main app

The yarn dev command starts both the front-end and back-end in parallel.

The back-end can take up to 30 seconds for the initial build, so be patient.

The packages are available at the following urls with hot-reloading:

Working on docs

To start the docs site, run yarn workspace docs dev. You can view the site at http://localhost:3200

Working on the SDKs

To work on the SDKs, cd into the desired directory and the following commands are available:

  • yarn test - Run just
  • yarn build - Run the rollup build process
  • yarn size - Get the gzip size of the bundle (must run yarn build first)

Working on the stats engine

To work on the Python stats engine, cd into the packages/stats directory and the following commands are available:

  • yarn test - Run pytest
  • yarn lint - Run flake8 and black
  • poetry build - Run the build process

Code Quality

There are a few repo-wide code quality tools:

  • yarn test - Run the full test suite on all packages
  • yarn type-check - Typescript type checking
  • yarn lint - Typescript code linting
  • yarn workspace stats lint - Python code linting (need to pip install flake8 black first)

There is a pre-commit hook that runs yarn lint automatically, so you shouldn't need to run that yourself.

Opening Pull Requests

  1. Please Provide a thoughtful commit message and push your changes to your fork using git push origin main (assuming your forked project is using origin for the remote name and you are on the main branch).

  2. Open a Pull Request on GitHub with a description of your changes.

Getting Help

Join our Slack community if you need help getting set up or want to chat. We're also happy to hop on a call and do some pair programming.