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What's New in React 16.3.0 - 16.4.2: Features Overview

The K&C team is still on a mission to keep you up to date when it comes to the latest versions and releases of React. Today, it stopped on the version 16.4.2. Yet, to draw a broad picture, we decided to grasp the version 16.3.0 as well.

React 16.3 - 16.4 Features

And without undue delay, let’s look what fascinating React prepared for us.

React 16.3 Context API

The most anticipated feature of the release was the introduction of a new context API that should be more efficient and support both deep updates and static type checking. It is a widely known fact that React has already offered multiple experimental APIs before, all of which were marked as "unofficial" and not recommended to use. So, after multiple experiments and debugging, it looks like React has finally managed to represent the updated API that will simplify state management without using Redux / MobX.


React store built on top of the new context API


Here is an example of a basic implementation.


https://github.com/didierfranc/react-waterfall

import { initStore } from 'react-waterfall'

const store = {
  initialState: { count: 0 },
  actions: {
    increment: ({ count }) => ({ count: count + 1 }),
  },
}

const { Provider, connect } = initStore(store)

let Count = ({ count, actions }) => (
  <>
    {count}
    <button onClick={actions.increment}>+</button>
  </>
)

Count = connect(state => ({ count: state.count }))(Count)

const App = () => (
  <Provider>
    <Count />
  </Provider>
)


React.createContext(“Hello”)

When should Context be used?


-instead of Redux in simple use cases;


-if you want to reduce prop drilling when passing props


-several times down to the root children;


-to control theming in your app;


-to control the flow of data;


-for localization.

The React Context API vs. Redux

Despite the React's new Context API, there are still cases when you may need to use Redux. So, when do we need to use it and when to avoid?


Rule of thumb - “if you don't know why you may need to use a Redux - DO NOT use it”


Let's take a closer look at the advantages that the new API offers, as well as disadvantages that can be overcome with Redux.


PROS:


-The new Context is easier to implement;


-You don't need an additional library;


-There's less code, it's better understandable.


CONS:


Limited functionality. It doesn't offer:


-Great set of development tools as in Redux;


-No ‘undo’ (time traveling);


-Less scalable;


-Not as many of ready-to-use tools as Redux can offer (ecosystem).


To summarize the above said, we'd say that the new Context app could be used for data flow in smaller apps, while in some cases you should stick to previous versions that will keep working for all React 16.x versions. However, with React 17 the old API will be deprecated, so don't forget to migrate on time.

New Ref APIs

Previously, React allowed to manage refs in two different ways: through legacy string ref API and the callback API. Legacy strings had multiple significant downsides, like problems with async, render props or static typing, which is why React recommended to use callbacks.


In the new version, additionally to callback refs, which will continue to be supported, React eliminated all the downsides and introduced new createRef API, which can be an ergonomic alternative to callback refs.

class UserForm extends Component {
   constructor(props) {
       super(props);
       this.textInput = React.createRef();
   }

   componentDidMount() {
       this.textInput.current.select();
   }

   state = {
       username: 'Default'
   };

   render() {
       return (
           <div>
               Name: <input type = 'text' value={this.state.username} ref={this.textInput} onChange={this.handleUserChange} />
           </div>
       )
   }
  
   handleUserChange = () => {
       const input = this.textInput.current;

       this.setState({
           username: input.value
       })
   }
}

Now, there's also another new ref API that comes with the 16.3 version, the Object Ref API. What it does, it brings the simplicity of strings API mixed with the stability of callback ref API. Object refs should be a good fit in most of the cases Finally, another new API that was introduced is the forwardRef API, which enables to take a ref and forward it as a normal prop. This ref can be used to access a nested element.

Lifecycle Methods Deprecation

The React API evolves over time, which means a few problematic lifecycle methods that caused bugs to need to be eliminated and replaced by the newer ones. Components that will soon be deprecated and prepended with UNSAFE are:


-componentWillMount


-componentWIllUpdate


-componentWIllReceiveProps


These methods have proved to be a source of confusion and bugs in the past, and they also need to be deprecated considering React's steady movement towards Async Mode.


So, what to use instead? React team offers the following migrations for the deprecated methods:

The second step can be skipped. In this case migration will have the following view: componentWillMount -> componentDidMount.

16.3 - Everything works as before

16.x - Everything works as before, but the deprecation warning will be added

17 - Still works with “UNSAFE_” prefix

New Lifecycle Methods

Now let's move to new methods that were introduced with React 16.3 release


-getDerivedStateFromProps



This method is actually static (ES6). Since it's static, you can’t reference it, so whatever is returned from the method would be updated. It will be called on the initial mounting of the component, as well as when it's re-rendered. This method is considered to be a safer alternative to the legacy componentWillReceiveProps. And in the version 16.4.0, the React developers managed to do so that every time under component rendering, getDerivedStateFromProps is now called every time regardless what caused the update.

class myComponent extends React.Component {
   state = {
       counter: 0
   };

   static getDerivedStateFromProps(nextProps, prevState) {
       if (prevState.counter !== nextProps.counter) {
           return {
               counter: nextProps.counter
           }
       }

       // Return null to indicate no change to state.
       return null;
   }
}

-getSnapshotBeforeUpdate



This method is called right before any DOM mutations are made. It enables your component to capture current values (e.g. scroll position) before they are potentially changed. Any value returned by this lifecycle will be passed as a parameter to componentDidUpdate(). Learn more about the getSnapshotBeforeUpdate() on the React's official documents.

class ScrollingList extends React.Component {
   listRef = null;

   getSnapshotBeforeUpdate(prevProps, prevState) {
       // Are we adding new items to the list?
       // Capture the current height of the list so we can adjust scroll later.
       if (prevProps.list.length < this.props.list.length) {
           return this.listRef.scrollHeight;
       }
       return null;
   }

   componentDidUpdate(prevProps, prevState, snapshot) {
       // If we have a snapshot value, we've just added new items.
       // Adjust scroll so these new items don't push the old ones out of view.
       // (snapshot here is the value returned from getSnapshotBeforeUpdate)
       if (snapshot !== null) {
           this.listRef.scrollTop +=
               this.listRef.scrollHeight - snapshot;
       }
   }

   render() {
       return (
           <div ref={this.setListRef}>
               {/* ...contents... */}
           </div>
       );
   }

   setListRef = ref => {
       this.listRef = ref;
   };

New StrictMode

StrictMode is a component that does not render any visible API, but identifies potential issues in an app by activating supplementary checks and warnings for its descendants.For example, if to wrap strict component around problems component that contains many of the deprecated methods, you will see a number of warnings in your console advising you to make some changes. 



To summarize, React's 16.3 StrictMode helps to:


-identify components with unsafe lifecycles


-throw warnings about legacy string ref API usage



-detect unexpected side effects


More features announced to be available in the upcoming releases of React.

Experimental AsyncMode

React 16 (Fiber) laid the framework for Async rendering. In 16.3 release an experimental and unstable Async mode component has become available. The idea is that you can wrap any content any content which has less priority in AsyncMode component (unstable_AsyncMode) and get better performance.

Updated React DevTools

Along with the React 16.3 release come new development tools to support debugging the new components. The new tools are available for both, Chrome and Firefox. These dev tools display AsyncMode, StrictMode, and the new Context API Components.

React v16.4.2: Pointer Events

The React team has also added some pointer events, which are now available in React DOM:


-onPointerDown


-onPointerMove


-onPointerUp


-onPointerCancel


-onGotPointerCapture


-onLostPointerCapture


-onPointerEnter


-onPointerLeave


-onPointerOver


-onPointerOut


But you should keep in mind that you may implement the mentioned event only in case your browser supports the Pointer Events specification.

React v16.4.2: Server-side vulnerability fix

Another issue the React team resolved in the latest version dealt with a vulnerability in the react-dom/serverimplementation, which existed in all following versions since the 16.0.0. This vulnerability affected server-rendered React apps and only those that contained the vulnerable pattern described below.


Your app might be affected by this vulnerability only if both of these two conditions are true:


-Your app is being rendered to HTML using ReactDOMServer API


-Your app includes a user-supplied attribute name in an HTML tag.


More precisely, the vulnerable pattern is as follows:

let props = {};

props[userProvidedData] = "hello";let element = <div {...props} />;let html = ReactDOMServer.renderToString(element);

How to migrate to React 16.3 - 16.4?

To migrate, use React code mode scripts to add prefix for depreciation methods. By using polyfill from “react-lifecycle-compat” you will add backward compatibility to new methods.


In terms of timing, deprecation warnings will be enabled with a future 16.x releases, but the legacy lifecycles will continue to work until version 17. Even in version 17, it will still be possible to use them, but they will be aliased with an “UNSAFE_” prefix to indicate that they might cause issues. We have also prepared an automated script to rename them in existing code.

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