f2b4e42ca2
Summary: X-link: https://github.com/facebook/react-native/pull/37349 Pull Request resolved: https://github.com/facebook/yoga/pull/1288 Fixes https://github.com/facebook/yoga/issues/1283 New versions of CMake add "policies" which control how the build system acts wrt breaking changes. By default, CMake will emulate the behavior of the version specified in `cmake_minimum_required`. Setting a policy to true (to opt into new behavior where `cmake_minimum_required` is lower than the current version) seems actually just error out on the old versions. Googling around, apparently the way I should be doing this is to specify `<policy_max>` as part of `cmake_minimum_required `. https://gitlab.kitware.com/cmake/cmake/-/issues/20392 This should I think use new policies introduced up to 3.26 (what we test on right now), while letting 3.13 be the minimum. Reviewed By: cortinico Differential Revision: D45724864 fbshipit-source-id: 120cc2015a043605e7c07ef0459667643a4284b7
yoga-layout
This package provides prebuilt JavaScript bindings for the Yoga layout engine. Both WebAssembly and asm.js variants are packaged, with the optimal loaded based on platform.
Usage
The default entrypoint provides an asynchronous loader function to return a Yoga instance.
import {loadYoga, Align} from 'yoga-layout';
const Yoga = await loadYoga();
const node = Yoga.Node.create();
node.setAlignContent(Align.Center);
An alternative synchronous API is provided for compatibility, but requires using asm.js in browsers instead of WebAssembly, leading to worse performance and larger assets.
import Yoga, {Align} from 'yoga-layout/sync';
const node = Yoga.Node.create();
node.setAlignContent(Align.Center);
Objects created by Yoga.<>.create() are not automatically garbage collected and should be freed once they are no longer in use.
// Free a config
config.free();
// Free a tree of Nodes
node.freeRecursive();
// Free a single Node
node.free();
Selecting WebAssembly or asm.js
For better performance and smaller packages, WebAssembly is preferred to asm.js where available. yoga-layout tries to provide the right default using export maps so that platforms which can take advantage of WebAssembly use it by default.
A specific entrypoint may be specified on platforms which do not understand export conditions.
import {loadYoga} from 'yoga-layout/wasm-async';
Contributing
Requirements
- Emscripten SDK
- CMake >= 3.13
- (Optional) ninja, for faster builds
Building
git clone https://github.com/facebook/yoga.git
cd yoga/javascript
yarn install
yarn build
Testing
# Build and test all entrypoints
yarn test
# Build and test a specific entrypoint
yarn test:asmjs-sync