Provide a component stack as a second argument to onRecoverableError. (@gnoff in #24591)
Fix hydrating into document causing a blank page on mismatch. (@gnoff in #24523)
Fix false positive hydration errors with Suspense. (@gnoff in #24480 and @acdlite in #24532)
Fix ignored setState in Safari when adding an iframe. (@gaearon in #24459)

React DOM Server

Pass information about server errors to the client. (@salazarm and @gnoff in #24551 and #24591)
Allow to provide a reason when aborting the HTML stream. (@gnoff in #24680)
Eliminate extraneous text separators in the HTML where possible. (@gnoff in #24630)
Disallow complex children inside <title> elements to match the browser constraints. (@gnoff in #24679)
Fix buffering in some worker environments by explicitly setting highWaterMark to 0. (@jplhomer in #24641)

Server Components (Experimental)

Add support for useId() inside Server Components. (@gnoff) in #24172

Readme

Source

`react-is`

This package allows you to test arbitrary values and see if they're a particular React element type.

Installation

# Yarn
yarn add react-is

# NPM
npm install react-is

Usage

Determining if a Component is Valid

import React from "react";
import * as ReactIs from "react-is";

class ClassComponent extends React.Component {
  render() {
    return React.createElement("div");
  }
}

const FunctionComponent = () => React.createElement("div");

const ForwardRefComponent = React.forwardRef((props, ref) =>
  React.createElement(Component, { forwardedRef: ref, ...props })
);

const Context = React.createContext(false);

ReactIs.isValidElementType("div"); // true
ReactIs.isValidElementType(ClassComponent); // true
ReactIs.isValidElementType(FunctionComponent); // true
ReactIs.isValidElementType(ForwardRefComponent); // true
ReactIs.isValidElementType(Context.Provider); // true
ReactIs.isValidElementType(Context.Consumer); // true
ReactIs.isValidElementType(React.createFactory("div")); // true

Determining an Element's Type

Context

import React from "react";
import * as ReactIs from 'react-is';

const ThemeContext = React.createContext("blue");

ReactIs.isContextConsumer(<ThemeContext.Consumer />); // true
ReactIs.isContextProvider(<ThemeContext.Provider />); // true
ReactIs.typeOf(<ThemeContext.Provider />) === ReactIs.ContextProvider; // true
ReactIs.typeOf(<ThemeContext.Consumer />) === ReactIs.ContextConsumer; // true

Element

import React from "react";
import * as ReactIs from 'react-is';

ReactIs.isElement(<div />); // true
ReactIs.typeOf(<div />) === ReactIs.Element; // true

Fragment

import React from "react";
import * as ReactIs from 'react-is';

ReactIs.isFragment(<></>); // true
ReactIs.typeOf(<></>) === ReactIs.Fragment; // true

Portal

import React from "react";
import ReactDOM from "react-dom";
import * as ReactIs from 'react-is';

const div = document.createElement("div");
const portal = ReactDOM.createPortal(<div />, div);

ReactIs.isPortal(portal); // true
ReactIs.typeOf(portal) === ReactIs.Portal; // true

StrictMode

import React from "react";
import * as ReactIs from 'react-is';

ReactIs.isStrictMode(<React.StrictMode />); // true
ReactIs.typeOf(<React.StrictMode />) === ReactIs.StrictMode; // true

Keywords

react

FAQs

What is react-is?

Brand checking of React Elements.

Is react-is popular?

The npm package react-is receives a total of 42,233,124 weekly downloads. As such, react-is popularity was classified as popular.

Is react-is well maintained?

We found that react-is demonstrated a healthy version release cadence and project activity. It has 7 open source maintainers collaborating on the project.

Last updated on 14 Jun 2022

react-is

.css-1z04cui{margin-bottom:var(--chakra-space-4);font-size:var(--chakra-fontSizes-md);}18.2.0 (June 14, 2022)

React DOM