12 posts tagged with "release"

Welcome to the 0.59 release of React Native! This is another big release with 644 commits by 88 contributors. Contributions also come in other forms, so thank you for maintaining issues, fostering communities, and teaching people about React Native. This month brings a number of highly anticipated changes, and we hope you enjoy them.

🎣 Hooks are here​

React Hooks are part of this release, which let you reuse stateful logic across components. There is a lot of buzz about hooks, but if you haven't heard, take a look at some of the wonderful resources below:

• Introducing Hooks explains why we’re adding Hooks to React.
• Hooks at a Glance is a fast-paced overview of the built-in Hooks.
• Building Your Own Hooks demonstrates code reuse with custom Hooks.
• Making Sense of React Hooks explores the new possibilities unlocked by Hooks.
• useHooks.com showcases community-maintained Hooks recipes and demos.

Be sure to give this a try in your apps. We hope that you find the reuse as exciting as we do.

📱 Updated JSC means performance gains and 64-bit support on Android​

React Native uses JSC (JavaScriptCore) to power your application. JSC on Android was a few years old, which meant that a lot of modern JavaScript features weren't supported. Even worse, it performed poorly compared iOS's modern JSC. With this release, that all changes.

Thanks to some awesome work by @DanielZlotin, @dulmandakh, @gengjiawen, @kmagiera, and @kudo JSC has caught up with the past few years. This brings with it 64-bit support, modern JavaScript support, and big performance improvements. Kudos for also making this a maintainable process now so that we can take advantage of future WebKit improvements without so much legwork, and thank you Software Mansion and Expo for making this work possible.

💨 Faster app launches with inline requires​

We want to help people have performant React Native apps by default and are working to bring Facebook's optimizations to the community. Applications load resources as needed rather than slowing down launch. This feature is called "inline requires", as it lets Metro identify components to be lazy loaded. Apps with a deep and varied component architecture will see the most improvement.

We need the community to let us know how it works before we turn it on by default. When you upgrade to 0.59, there will be a new metro.config.js file; flip the options to true and give us your feedback! Read more about inline requires in the performance docs to benchmark your app.

🚅 Lean core is underway​

React Native is a large and complex project with a complicated repository. This makes the codebase less approachable to contributors, difficult to test, and bloated as a dev dependency. Lean Core is our effort to address these issues by migrating code to separate libraries for better management. The past few releases have seen the first steps of this, but let's get serious.

You may notice that additional components are now officially deprecated. This is great news, as there are now owners for these features actively maintaining them. Heed the warning messages and migrate to the new libraries for these features, because they will be removed in a future release. Below is a table indicating the component, its status, and where you may migrate your use to.

Over the coming months, there will be many more components following this path to a leaner core. We're looking for help with this — head over to the lean core umbrella to pitch in.

👩🏽‍💻 CLI improvements​

React Native's command line tools are developer's entry point to the ecosystem, but they had long-standing issues and lacked official support. The CLI tools have been moved to a new repository, and a dedicated group of maintainers have already made some exciting improvements.

Logs are formatted much better now. Commands now run nearly instantly — you'll immediately notice a difference:

🚀 Upgrading to 0.59​

We heard your feedback regarding the React Native upgrade process and we are taking steps to improve the experience in future releases. To upgrade to 0.59, we recommend using rn-diff-purge to determine what has changed between your current React Native version and 0.59, then applying those changes manually. Once you've upgraded your project to 0.59, you will be able to use the newly improved react-native upgrade command (based on rn-diff-purge!) to upgrade to 0.60 and beyond as newer releases become available.

🔨 Breaking Changes​

Android support in 0.59 has been cleaned up following Google's latest recommendations, which may result in potential breakage of existing apps. This issue might present as a runtime crash and a message, "You need to use a Theme.AppCompat theme (or descendant) with this activity". We recommend updating your project's AndroidManifest.xml file, making sure that the android:theme value is an AppCompat theme (such as @style/Theme.AppCompat.Light.NoActionBar).

The react-native-git-upgrade command has been removed in 0.59, in favor of the newly improved react-native upgrade command.

🤗 Thanks​

Lots of new contributors helped with enabling generation of native code from flow types and resolving Xcode warnings - these are a great way to learn how React Native works and contributing to the greater good. Thank you! Look out for similar issues in the future.

While these are the highlights that we noted, there are many others to be excited about. To see all of the updates, take a look at the changelog. 0.59 is a huge release – we can't wait for you to try it out.

We have even more improvements coming throughout the rest of the year. Stay tuned!

Ryan and the whole React Native core team

The long-awaited 0.56 version of React Native is now available 🎉. This blog post highlights some of the changes introduced in this new release. We also want to take the opportunity to explain what has kept us busy since March.

The breaking changes dilemma, or, "when to release?"​

The Contributor's Guide explains the integration process that all changes to React Native go through. The project has is composed by many different tools, requiring coordination and constant support to keep everything working properly. Add to this the vibrant open source community that contributes back to the project, and you will get a sense of the mind-bending scale of it all.

With React Native's impressive adoption, breaking changes must be made with great care, and the process is not as smooth as we'd like. A decision was made to skip the April and May releases to allow the core team to integrate and test a new set of breaking changes. Dedicated community communication channels were used along the way to ensure that the June 2018 (0.56.0) release is as hassle-free as possible to adopt by those who patiently waited for the stable release.

Is 0.56.0 perfect? No, as every piece of software out there: but we reached a point where the tradeoff between "waiting for more stability" versus "testing led to successful results so we can push forward" that we feel ready to release it. Moreover, we are aware of a few issues that are not solved in the final 0.56.0 release. Most developers should have no issues upgrading to 0.56.0. For those that are blocked by the aforementioned issues, we hope to see you around in our discussions and we are looking forward to working with you on a solution to these issues.

You might consider 0.56.0 as a fundamental building block towards a more stable framework: it will take probably a week or two of widespread adoption before all the edge cases will be sanded off, but this will lead to an even better July 2018 (0.57.0) release.

We'd like to conclude this section by thanking all the 67 contributors who worked on a total of 818 commits (!) that will help make your apps even better 👏.

And now, without further ado...

The Big Changes​

Babel 7​

As you may know, the transpiler tool that allows us all to use the latest and greatest features of JavaScript, Babel, is moving to v7 soon. Since this new version brings along some important changes, we felt that now it would be a good time to upgrade, allowing Metro to leverage on its improvements.

If you find yourself in trouble with upgrading, please refer to the documentation section related to it.

Modernizing Android support​

On Android, much of the surrounding tooling has changed. We've updated to Gradle 3.5, Android SDK 26, Fresco to 1.9.0, and OkHttp to 3.10.0 and even the NDK API target to API 16. These changes should go without issue and result in faster builds. More importantly, it will help developers comply with the new Play Store requirements coming into effect next month.

Related to this, we'd like to particularly thank Dulmandakh for the many PRs submitted in order to make it possible 👏.

There are some more steps that need to be taken in this direction, and you can follow along with the future planning and discussion of updating the Android support in the dedicated issue (and a side one for the JSC).

New Node, Xcode, React, and Flow – oh my!​

Node 8 is now the standard for React Native. It was actually already being tested already, but we've put both feet forward as Node 6 entered maintenance mode. React was also updated to 16.4, which brings a ton of fixes with it.

We're dropping support for iOS 8, making iOS 9 the oldest iOS version that can be targeted. We do not foresee this being a problem, as any device that can run iOS 8, can be upgraded to iOS 9. This change allowed us to remove rarely-used code that implemented workarounds for older devices running iOS 8.

The continuous integration toolchain has been updated to use Xcode 9.4, ensuring that all iOS tests are run on the latest developer tools provided by Apple.

We have upgraded to Flow 0.75 to use the new error format that many devs appreciate. We've also created types for many more components. If you're not yet enforcing static typing in your project, please consider using Flow to identify problems as you code instead of at runtime.

And a lot of other things...​

For instance, YellowBox was replaced with a new implementation that makes debugging a lot better.

For the complete release notes, please reference the full changelog here. And remember to keep an eye on the upgrading guide to avoid issues moving to this new version.

A final note: starting this week, the React Native core team will resume holding monthly meetings. We'll make sure to keep everyone up-to-date with what's covered, and ensure to keep your feedback at hand for future meetings.

Happy coding everyone!

Lorenzo, Ryan, and the whole React Native core team

PS: as always, we'd like to remind everyone that React Native is still in 0.x versioning because of the many changes still undergoing - so remember when upgrading that yes, probably, something may still crash or be broken. Be helpful towards each other in the issues and when submitting PRs - and remember to follow the CoC enforced: there's always a human on the other side of the screen.