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Frontend Development Guidelines

This document describes various guidelines to ensure consistency and quality across GitLab's frontend team.

Overview

GitLab is built on top of Ruby on Rails using Haml with Hamlit. Be wary of the limitations that come with using Hamlit. We also use SCSS and plain JavaScript with modern ECMAScript standards supported through Babel and ES module support through webpack.

We also utilize webpack to handle the bundling, minification, and compression of our assets.

Working with our frontend assets requires Node (v4.3 or greater) and Yarn (v0.17 or greater). You can find information on how to install these on our installation guide.

jQuery is used throughout the application's JavaScript, with Vue.js for particularly advanced, dynamic elements.

Browser Support

For our currently-supported browsers, see our requirements.

Development Process

Share your work early

  1. Before writing code guarantee your vision of the architecture is aligned with GitLab's architecture.
  2. Add a diagram to the issue and ask a Frontend Architecture about it.

Diagram of Issue Boards Architecture

  1. Don't take more than one week between starting work on a feature and sharing a Merge Request with a reviewer or a maintainer.

Vue features

  1. Follow the steps in Vue.js Best Practices
  2. Follow the style guide.
  3. Only a handful of people are allowed to merge Vue related features. Reach out to one of Vue experts early in this process.

Architecture

How we go about making fundamental design decisions in GitLab's frontend team or make changes to our frontend development guidelines.

Testing

How we write frontend tests, run the GitLab test suite, and debug test related issues.

Design Patterns

Common JavaScript design patterns in GitLab's codebase.

Vue.js Best Practices

Vue specific design patterns and practices.

Icons

How we use SVG for our Icons.

Style Guides

JavaScript Style Guide

We use eslint to enforce our JavaScript style guides. Our guide is based on the excellent Airbnb style guide with a few small changes.

SCSS Style Guide

Our SCSS conventions which are enforced through scss-lint.

Performance

Best practices for monitoring and maximizing frontend performance.

Security

Frontend security practices.

Accessibility

Our accessibility standards and resources.

DropLab

Our internal DropLab dropdown library.