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Vue.js Contributing Guide

Hi! I’m really excited that you are interested in contributing to Vue.js. Before submitting your contribution though, please make sure to take a moment and read through the following guidelines.

Issue Reporting Checklist

  • Make sure that you are using the latest version of Vue.
  • Try to search for your issue, it may have already been answered or even fixed in the development branch.
  • It is recommended that you make a JSFiddle to reproduce your issue. You could start with this template that already includes the latest version of Vue.
  • If your issue is resolved but still open, don’t hesitate to close it. In case you found a solution by yourself, it could be helpful to explain how you fixed it.

Pull Request Checklist

  • Checkout a topic branch from dev and merge back against dev.
  • Work in the src folder and DO NOT checkin dist in the commits.
  • Squash the commit if there are too many small ones.
  • Follow the code style.
  • Make sure the default grunt task passes. (see development setup)
  • If adding new feature:
    • Add accompanying test case.
    • Provide convincing reason to add this feature. Ideally you should open a suggestion issue first and have it greenlighted before working on it.
  • If fixing a bug:
    • Provide detailed description of the bug in the PR. Live demo preferred.
    • Add appropriate test coverage if applicable.

Code Style

  • No semicolons unless necessary.

  • Follow JSDoc.

  • 2 spaces indentation.

  • multiple var declarations.

  • align equal signs where appropriate.

  • Return early.

  • 1 space after function

  • 1 space between arguments, but not between parens.

  • When in doubt, read the source code.

  • Break long ternary conditionals like this:

    var a = superLongConditionalStatement
  ? 'yep'
  : 'nope'

Development Setup

You will need Node, Grunt, PhantomJS and CasperJS.

# in case you don’t already these:
# npm install -g grunt-cli phantomjs casperjs
$ npm install

To watch and auto-build dist/vue.js during development:

$ npm run dev

To lint:

grunt jshint

To build:

$ grunt build

To test:

# if you don’t have these yet:
# npm install -g phantomjs casperjs
$ grunt test

The unit tests are written with Jasmine and run with Karma. The functional tests are written for and run with CasperJS.

If you are not using a Mac

You can modify the Gruntfile to only run Karma tests in browsers that are available on your system. Just make sure don’t check in the Gruntfile for the commit.