13eacf8858
Summary:
I wanna repeat the constants export in `yoga-wasm-web`, to achieve
```js
import { ALIGN_CENTER } from "yoga-layout";
```
And I failed. it is impossible because `rollup` and other tools can't transform commonjs `module.exports = { WHATEVER: 1 }` into ECMAScript modules. however, they can work with separate exports like `exports.WHATEVER = 1` and this PR transforms yoga constants into this convertible format
This doesn't change anything for the yoga package, but it makes it possible to reexport constants without any modification and hacks, like this
```js
export * from "./javascript/src_js/generated/YGEnums.js";
```
[discussion in yoga-layout-wasm](https://github.com/shuding/yoga-wasm-web/pull/15)
Pull Request resolved: https://github.com/facebook/yoga/pull/1229
Reviewed By: NickGerleman
Differential Revision: D43437177
Pulled By: rshest
fbshipit-source-id: bfe1404d1b48779f404e6510f2aafadd7fd4e774
Yoga 
Yoga is an embeddable and performant flexbox layout engine with bindings for multiple languages.
Building
Yoga's main implementation targets C++ 14 with accompanying build logic in CMake. A wrapper is provided to build the main library and run unit tests.
./unit_tests <Debug|Release>
While not required, this script will use ninja if it is installed for faster builds.
Yoga is additionally part of the vcpkg collection of ports maintained by Microsoft and community contributors. If the version is out of date, please create an issue or pull request on the vcpkg repository.
Adding Tests
Many of Yoga's tests are automatically generated, using HTML fixtures describing node structure. These are rendered in Chrome to generate an expected layout result for the tree. New fixtures can be added to gentest/fixtures.
<div id="my_test" style="width: 100px; height: 100px; align-items: center;">
<div style="width: 50px; height: 50px;"></div>
</div>
To generate new tests from added fixtures:
- Run
bundle installin thegentestdirectory to install dependencies of the test generator. - Run
ruby gentest.rbin thegentestdirectory.
Debugging
Yoga provides a VSCode "launch.json" configuration which allows debugging unit tests. Simply add your breakpoints, and run "Debug C++ Unit tests (lldb)" (or "Debug C++ Unit tests (vsdbg)" on Windows).