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Contributing

Table of Contents

Generating a Changelog

By using "standard" guidelines we are able to automatically generate a changelog from our git commit messages. The tool used to do that is standard-version.

Here is an excerpt from their documentation.

First Release

To generate your changelog for your first release, simply do:

# npm run script
npm run release -- --first-release
# or global bin
standard-version --first-release

This will tag a release without bumping the version in package.json (et al.).

When ready, push the git tag and npm publish your first release. \o/

Release as a pre-release

Use the flag --prerelease to generate pre-releases:

Suppose the last version of your code is 1.0.0, and your code to be committed has patched changes. Run:

# npm run script
npm run release -- --prerelease

you will get version 1.0.1-0.

If you want to name the pre-release, you specify the name via --prerelease <name>.

For example, suppose your pre-release should contain the alpha prefix:

# npm run script
npm run release -- --prerelease alpha

this will tag the version 1.0.1-alpha.0

Release as a target type imperatively like npm version

To forgo the automated version bump use --release-as with the argument major, minor or patch:

Suppose the last version of your code is 1.0.0, you've only landed fix: commits, but you would like your next release to be a minor. Simply do:

# npm run script
npm run release -- --release-as minor
# Or
npm run release -- --release-as 1.1.0

you will get version 1.1.0 rather than the auto generated version 1.0.1.

NOTE: you can combine --release-as and --prerelease to generate a release. This is useful when publishing experimental feature(s).

Git Commit Guidelines

We use the Git Commit Guidelines that Google uses for AngularJS to format our git commit messages. Here is an excerpt of those guidelines.

We have very precise rules over how our git commit messages can be formatted. This leads to more readable messages that are easy to follow when looking through the project history.

Commit Message Format

Each commit message consists of a header, a body and a footer. The header has a special format that includes a type, a scope and a subject:

<type>(<scope>): <subject>
<BLANK LINE>
<body>
<BLANK LINE>
<footer>

The header is mandatory and the scope of the header is optional.

Any line of the commit message cannot be longer 100 characters! This allows the message to be easier to read on GitHub as well as in various git tools.

Revert

If the commit reverts a previous commit, it should begin with revert: , followed by the header of the reverted commit. In the body it should say: This reverts commit <hash>., where the hash is the SHA of the commit being reverted.

Type

Must be one of the following:

  • feat: A new feature
  • fix: A bug fix
  • docs: Documentation only changes
  • style: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)
  • refactor: A code change that neither fixes a bug nor adds a feature
  • perf: A code change that improves performance
  • test: Adding missing or correcting existing tests
  • chore: Changes to the build process or auxiliary tools and libraries such as documentation generation

Scope

The scope could be anything specifying place of the commit change. For example $location, $browser, $compile, $rootScope, ngHref, ngClick, ngView, etc...

You can use * when the change affects more than a single scope.

Subject

The subject contains succinct description of the change:

  • use the imperative, present tense: "change" not "changed" nor "changes"
  • don't capitalize first letter
  • no dot (.) at the end

Body

Just as in the subject, use the imperative, present tense: "change" not "changed" nor "changes". The body should include the motivation for the change and contrast this with previous behavior.

Footer

The footer should contain any information about Breaking Changes and is also the place to [reference GitHub issues that this commit closes][closing-issues].

Breaking Changes should start with the word BREAKING CHANGE: with a space or two newlines. The rest of the commit message is then used for this.

A detailed explanation can be found in this document.