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# Frontend Development Guidelines

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

## Overview

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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].

### Javascript development

[Vue.js][vue] is used for particularly advanced, dynamic elements and based on previous iterations [jQuery][jquery] is used in lot of places through the application's JavaScript.

We also use [Axios][axios] to handle all of our network requests.
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We also utilize [webpack][webpack] to handle the bundling, minification, and
compression of our assets.

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Working with our frontend assets requires Node (v6.0 or greater) and Yarn
(v1.2 or greater).  You can find information on how to install these on our
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[installation guide][install].

### Browser Support

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

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---

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## [Development Process](development_process.md)
How we plan and execute the work on the frontend.
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## [Architecture](architecture.md)
How we go about making fundamental design decisions in GitLab's frontend team
or make changes to our frontend development guidelines.

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

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## [Axios](axios.md)
Axios specific practices and gotchas.
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## [Icons](icons.md)
How we use SVG for our Icons.

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## [Components](components.md)

How we use UI components.

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---

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## 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].

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## [Performance](performance.md)
Best practices for monitoring and maximizing frontend performance.

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## [Security](security.md)
Frontend security practices.

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## [Accessibility](accessibility.md)
Our accessibility standards and resources.

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## [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.

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[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/
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[axios]: https://github.com/axios/axios
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[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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## [DropLab](droplab/droplab.md)
Our internal `DropLab` dropdown library.

* [DropLab](droplab/droplab.md)
* [Ajax plugin](droplab/plugins/ajax.md)
* [Filter plugin](droplab/plugins/filter.md)
* [InputSetter plugin](droplab/plugins/input_setter.md)