What’s new in React v17?

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Today we are going to explore the major functions of react v17 update. It has been updated recently since React Fiber has been working in a great way and enhance the developer experience, efficiency of react-built applications. However, there are some changes in the new react v17 like only improvements to the earlier existing features.

Additionally, knowing what’s coming up in the pipeline from the React team, can help with;

Better understand React:

A react team roadmap help you to understand the technology better.

Write better code:

You can easily get deprecated code so it’s better to write code that will last the test time instead of spending time upgrading later.

Known bugs:

If you are not aware about the existing bug can cause a headache at the time of debug process in the framework.

Stay informed:

Always Hire React.js Developers who keep up with changes and updates actively.

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Technology stack:

It is important to make a decision while deciding on the technology stack for better Reactjs Development Services.

Here we will describe the role of this major release, what changes you can expect in it:

No New Features

This update is different from regular updates as it doesn’t add any new developer-facing feature. The main focus of this new release is on making it simple to upgrade React itself.

Hence, React 17 is a “stepping stone” release that makes it makes it super easy for react hierarchy managed by one version of React inside a tree managed by a different version of React.

Gradual Upgrades

In the past React has given so many upgrades like either you stay on an old version, or you upgrade your whole app to a new version. Yes! There was no in-between.

In this process, some API changes like deprecating the legacy context API, are impossible to do in an automated way. Not all the apps written today ever use them but React still use it, also react has another option of leaving some apps behind on an old version of React. In both cases, it’s a win-win situation.

React 17 enables gradual React upgrades.

At the time of the new version upgrade, you would usually upgrade your whole app at once, plus it works well for many apps. But it can make the coding process a bit challenging and earlier it was not even actively maintained. Before it’s possible to use two versions of react on the page, until React 17 this has been fragile and caused problems with events.

React 17 has come with a promise of next future versions that will give us more option. What’s fascinating about React 17 is you can upgrade the whole app at once, like any other application. Or you can also upgrade the application step by step. Such as you might decide to migrate most of your app to React 17, but keep some lazy-loaded dialog or a sub route on React 16.

Keep in mind, this doesn’t mean you have to do gradual upgrades, however, for most of the apps, upgrading all at once is the best solution. You can load two versions of react, even if the other one is getting lazy load as per project requirement is not count as an ideal choice. Hence for larger apps which you that aren’t maintained on daily basis may consider React 17 to not get left behind.

To enable gradual updates, there need to be some changes in React event system. This is one of the major benefits of React 17 because these changes are potentially breaking. Hence, you only have to change less than twenty components out of 100,000+ so that most apps can upgrade to React 17 without too much trouble.

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Breaking changes

Apart from the above, there are a few breaking changes that shipped with this new version. The React Team has ensured they are minimal as possible, some of them are just as minor but still essential to note. So, yes, things like deprecated methods in previous releases are still available.

  • No event pooling
  • New Lifecycle Methods
  • Removing Private Exports
  • Native Component Stacks
  • Changes to Event Delegation
  • New Changes in the Event System
  • Consistent Errors for Returning Undefined
  • Event root will no longer document.document Element
  • Clean up in useEffect() will change from synchronous to asynchronous


And with that, I hope the above information will be fruitful for you to gain. Although React 17 did not come with any front-facing features, it still sets a precedent for future versions by directly addressing the upgrade experience and more closely aligns React behavior with modern browsers. Plus, the latest ReactJS comes with an entirely rewritten server render, which makes it quick and ideal for streaming. It is a great place to pitch improvements. Want to learn more? Ping us at Shiv Technolabs Pvt.Ltd. one of the leading Reactjs Development Company. We concurrently offer the web app development and mobile app development services.

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