README.md · LEARN/yoga

# Yoga [![CocoaPods](https://img.shields.io/cocoapods/v/YogaKit.svg)](http://cocoapods.org/pods/YogaKit) [![npm](https://img.shields.io/npm/v/yoga-layout.svg)](https://www.npmjs.com/package/yoga-layout) [![bintray](https://img.shields.io/bintray/v/facebook/maven/com.facebook.yoga:yoga.svg)](https://bintray.com/facebook/maven/com.facebook.yoga%3Ayoga/_latestVersion) [![NuGet](https://img.shields.io/nuget/v/Facebook.Yoga.svg)](https://www.nuget.org/packages/Facebook.Yoga)

## Building
Yoga builds with [buck](https://buckbuild.com). Make sure you install buck before contributing to Yoga. Yoga's main implementation is in C++, with bindings to supported languages and frameworks. When making changes to Yoga please ensure the changes are also propagated to these bindings when applicable.

## Testing
For testing we rely on [gtest](https://github.com/google/googletest) as a submodule. After cloning Yoga run `git submodule init` followed by `git submodule update`.

For any changes you make you should ensure that all the tests are passing. In case you make any fixes or additions to the library please also add tests for that change to ensure we don't break anything in the future. Tests are located in the `tests` directory. Run the tests by executing `buck test //:yoga`.

Instead of manually writing a test which ensures parity with web implementations of Flexbox you can run `gentest/gentest.rb` to generate a test for you. You can write html which you want to verify in Yoga, in `gentest/fixtures` folder, such as the following.

```html
<div id="my_test" style="width: 100px; height: 100px; align-items: center;">
  <div style="width: 50px; height: 50px;"></div>
</div>
```

Run `gentest/gentest.rb` to generate test code and re-run `buck test //:yoga` to validate the behavior. One test case will be generated for every root `div` in the input html.

You may need to install the latest watir-webdriver gem (`gem install watir-webdriver`) and [ChromeDriver](https://sites.google.com/a/chromium.org/chromedriver/) to run `gentest/gentest.rb` Ruby script.

### .NET
.NET testing is not integrated in buck yet, you might need to set up .NET testing environment. We have a script which to launch C# test on macOS, `csharp/tests/Facebook.Yoga/test_macos.sh`.

## Benchmarks
Benchmarks are located in `benchmark/YGBenchmark.c` and can be run with `buck run //benchmark:benchmark`. If you think your change has affected performance please run this before and after your change to validate that nothing has regressed. Benchmarks are run on every commit in CI.

### JavaScript
Installing through NPM
```sh
npm install yoga-layout
```
By default this will install the library and try to build for all platforms (node, browser asm, and standalone webpack). You may receive errors if you do not have the required platform development tools already installed. To preset the platform you'd like to build for you can set a .npmrc property first.
```sh
npm config set yoga-layout:platform standalone
```
This will now only run the standalone webpack build upon install.

## Build Platforms

| name           | description                                     |
|----------------|-------------------------------------------------|
| all (default)  | Builds all of these platforms.                  |
| browser        | Builds asm js browser version.                  |
| node           | Builds node js version.                         |
| standalone     | Runs webpack.                                   |
| none           | Does nothing. You can use the prepackaged libs. |

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