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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].
---
## 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.
## [Event Tracking](event_tracking.md)
How we use Snowplow to track custom events.
## 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
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