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0x Contribution Guide

We welcome contributions from anyone on the internet and are grateful for even the smallest contributions. This document will help get you setup to start contributing back to 0x.

Getting started

  1. Fork 0xproject/0x-tools
  2. Clone your fork
  3. Follow the installation & build steps in the repo's top-level README.
  4. Setup the recommended Development Tooling.
  5. Open a PR with the [WIP] flag against the development branch and describe the change you are intending to undertake in the PR description. (see our branch naming conventions)

Before removing the [WIP] tag and submitting the PR for review, make sure:

  • It passes our linter checks (yarn lint)
  • It is properly formatted with Prettier (yarn prettier)
  • It passes our continuous integration tests (See: Enabling code coverage checks on your fork for instructions on getting the submit-coverage test to pass on forks)
  • You've created/updated the corresponding CHANGELOG entries.
  • Your changes have sufficient test coverage (e.g regression tests have been added for bug fixes)

Branch structure

We have two main branches:

  • master represents the most recently released (published on npm) version of the codebase.
  • development represents the current development state of the codebase.

ALL PRs should be opened against development.

Branch names should be prefixed with fix, feature or refactor.

  • e.g fix/missing-import
  • If the PR only edits a single package, add it's name too
    • e.g fix/subproviders/missing-import

CHANGELOGs

At 0x we use Semantic Versioning for all our published packages. If a change you make corresponds to a semver bump, you must modify the package's CHANGELOG.json file accordingly.

Each CHANGELOG entry that corresponds to a published package will have a timestamp. If no entry exists without a timestamp, you must first create a new one:

{
        "version": "1.0.1", <- The updated package version
        "changes": [
            {
                "note": "", <- Describe your change
                "PR": 100 <- Your PR number
            }
        ]
    },

If an entry without a timestamp already exists, this means other changes have been introduced by other collaborators since the last publish. Add your changes to the list of notes and adjust the version if your PR introduces a greater semver change (i.e current changes required a patch bump, but your changes require a major version bump).

Development Tooling

We strongly recommend you use the VSCode text editor since most of our code is written in TypeScript and it offers amazing support for the language.

Linter

We use TSLint with custom configs to keep our code-style consistent.

Use yarn:lint to lint the entire monorepo, and PKG={PACKAGE_NAME} yarn lint to lint a specific package.

If you want to change a rule, or add a custom rule, please make these changes to our tslint-config package. All other packages have it as a dependency.

Integrate it into your text editor:

Auto-formatter

We use Prettier to auto-format our code. Be sure to either add a text editor integration or a pre-commit hook to properly format your code changes.

If using the Atom text editor, we recommend you install the following packages:

Unenforced coding conventions

A few of our coding conventions are not yet enforced by the linter/auto-formatter. Be careful to follow these conventions in your PR's.

  1. Unused anonymous function parameters should be named with an underscore + number (e.g _1, _2, etc...)
  2. There should be a new-line between methods in a class and between test cases.
  3. If a string literal has the same value in two or more places, it should be a single constant referenced in both places.
  4. Do not import from a project's index.ts (e.g import { Token } from '../src';). Always import from the source file itself.
  5. Generic error variables should be named err instead of e or error.
  6. If you must cast a variable to any - try to type it back as fast as possible. (e.g., const cw = ((zeroEx as any)._contractWrappers as ContractWrappers);). This ensures subsequent code is type-safe.
  7. Our enum conventions coincide with the recommended TypeScript conventions, using capitalized keys, and all-caps snake-case values. Eg GetStats = 'GET_STATS'
  8. All public, exported methods/functions/classes must have associated Javadoc-style comments.

Fix submit-coverage CI failure

If you simply fork the repo and then create a PR from it, your PR will fail the submit-coverage check on CI. This is because the 0x CircleCI configuration sets the COVERALLS_REPO_TOKEN environment variable to the token for 0xProject/0x-tools, but when running the check against your fork the token needs to match your repo's name your-username/0x-tools.

To facilitate this check, after creating your fork, but before creating the branch for your PR, do the following:

  1. Log in to coveralls.io, go to Add Repos, and enable your fork. Then go to the settings for that repo, and copy the Repo Token identifier.
  2. Log in to CircleCI, go to Add Projects, click the Set Up Project button corresponding to your fork, and then click Start Building. (Aside from step 3 below, no actual set up is needed, since it will use the .circleci/config.yml file in 0x-tools, so you can ignore all of the instruction/explanation given on the page with the Start Building button.)
  3. In CircleCI, configure your project to add an environment variable, with name COVERALLS_REPO_TOKEN, and for the value paste in the Repo Token you copied in step 1.

Now, when you push to your branch, CircleCI will automatically run all of the checks in your own instance, and the coverage check will work since it has the proper Repo Token, and the PR will magically refer to your own checks rather than running them in the 0x CircleCI instance.