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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][rails] using [Haml][haml] and also a JavaScript based Frontend with [Vue.js][vue].
Be wary of [the limitations that come with using Hamlit][hamlit-limits]. We also use [SCSS][scss] and plain JavaScript with
modern ECMAScript standards supported through [Babel][babel] and ES module support through [webpack][webpack].

Working with our frontend assets requires Node (v8.10.0 or greater) and Yarn
(v1.10.0 or greater). You can find information on how to install these on our
[installation guide][install].

### Browser Support

For our currently-supported browsers, see our [requirements][requirements].

Use [BrowserStack](https://www.browserstack.com/) to test with our supported browsers. Login to BrowserStack with the credentials saved in GitLab's [shared 1Password account](https://about.gitlab.com/handbook/security/#1password-for-teams).

## Initiatives

Current high-level frontend goals are listed on [Frontend Epics](https://gitlab.com/groups/gitlab-org/-/epics?label_name%5B%5D=frontend).

## [Principles](principles.md)

High-level guidelines for contributing to GitLab.

## [Development Process](development_process.md)

How we plan and execute the work on the frontend.

## [Architecture](architecture.md)

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

## [Testing](../testing_guide/frontend_testing.md)

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

## [Design Patterns](design_patterns.md)

Common JavaScript design patterns in GitLab's codebase.

## [Vue.js Best Practices](vue.md)

Vue specific design patterns and practices.

## [Vuex](vuex.md)

Vuex specific design patterns and practices.

## [Axios](axios.md)

Axios specific practices and gotchas.

## [GraphQL](graphql.md)

How to use GraphQL

## [Icons and Illustrations](icons.md)

How we use SVG for our Icons and Illustrations.

## [Components](components.md)

How we use UI components.

## Frontend FAQ

Read the [frontend's FAQ](frontend_faq.md) for common small pieces of helpful information.

## Style Guides

### [JavaScript Style Guide](style_guide_js.md)

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

### [SCSS Style Guide](style_guide_scss.md)

Our SCSS conventions which are enforced through [scss-lint][scss-lint].

## [Performance](performance.md)

Best practices for monitoring and maximizing frontend performance.

## [Security](security.md)

Frontend security practices.

## [Accessibility](accessibility.md)

Our accessibility standards and resources.

## [Internationalization (i18n) and Translations](../i18n/externalization.md)

Frontend internationalization support is described in [this document](../i18n/).
The [externalization part of the guide](../i18n/externalization.md) explains the helpers/methods available.

[rails]: http://rubyonrails.org/
[haml]: http://haml.info/
[hamlit]: https://github.com/k0kubun/hamlit
[hamlit-limits]: https://github.com/k0kubun/hamlit/blob/master/REFERENCE.md#limitations
[scss]: http://sass-lang.com/
[babel]: https://babeljs.io/
[webpack]: https://webpack.js.org/
[jquery]: https://jquery.com/
[vue]: http://vuejs.org/
[axios]: https://github.com/axios/axios
[airbnb-js-style-guide]: https://github.com/airbnb/javascript
[scss-lint]: https://github.com/brigade/scss-lint
[install]: ../../install/installation.md#4-node
[requirements]: ../../install/requirements.md#supported-web-browsers