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react-is

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react-is

Brand checking of React Elements.

  • 16.13.1
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What is react-is?

The react-is package is a collection of utilities that allow you to determine the type of a React element. It is useful for type-checking elements and for working with React's different types of components and elements in a more abstract way.

What are react-is's main functionalities?

Type-checking elements

This feature allows you to check if a value is a valid React component type or a React element. It's useful for validating props or for conditional rendering logic.

import { isValidElementType, isElement } from 'react-is';

const MyComponent = () => <div>Hello World</div>;
const myElement = <MyComponent />;

const validType = isValidElementType(MyComponent); // true
const elementCheck = isElement(myElement); // true

Identifying different element types

This feature allows you to identify specific element types like fragments, strict mode wrappers, and portals. This can be useful when writing custom rendering logic or testing components.

import { isFragment, isStrictMode, isPortal } from 'react-is';

const myFragment = <React.Fragment></React.Fragment>;
const myStrictMode = <React.StrictMode></React.StrictMode>;
const myPortal = ReactDOM.createPortal(<div />, document.body);

const fragmentCheck = isFragment(myFragment); // true
const strictModeCheck = isStrictMode(myStrictMode); // true
const portalCheck = isPortal(myPortal); // true

Working with Context

This feature allows you to check if an element is a Context Provider or a Context Consumer. This is particularly useful in higher-order components or in libraries that need to handle context-related elements.

import { isContextConsumer, isContextProvider } from 'react-is';

const MyContext = React.createContext();

const contextProviderCheck = isContextProvider(<MyContext.Provider value={null}></MyContext.Provider>); // true
const contextConsumerCheck = isContextConsumer(<MyContext.Consumer>{() => null}</MyContext.Consumer>); // true

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Package last updated on 19 Mar 2020

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