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The React Context hell
What is the React Context hell?
Like the callback hell, usual when jQuery was used for everything, the React Context hell is the nasty code you get taking advantage of the React Context API.
const App = () => { // ... some code return ( <> <ReduxProvider value={store}> <ThemeProvider value={theme}> <OtherProvider value={otherValue}> <OtherOtherProvider value={otherOtherValue}> {/** ... other providers*/} <HellProvider value={hell}> <HelloWorld /> </HellProvider> {/** ... other providers*/} </OtherOtherProvider> </OtherProvider> </ThemeProvider> </ReduxProvider> </> )}
How to fix it?
To clean up the nasty code you get from taking advantage of React Context API we need a way to nest multiple Context.Provider
without passing them as children
of each other.
To achieve that we can use the React.cloneElement API.
The cloneElement
API
React.cloneElement( element, [props], [...children])
Clone and return a new React element using element as the starting point. The resulting element will have the original elements props with the new props merged in shallowly. New children will replace existing children. key and ref from the original element will be preserved.
We can use the cloneElement
API to reduce
a collection of providers, this way we don't have to nest them inside each other.
return [ <ReduxProvider value={store} />, <ThemeProvider value={theme} />, <OtherProvider value={otherValue} />, <OtherOtherProvider value={otherOtherValue} />, // ...others, <HellProvider value={hell} />, <HelloWorld />,].reduceRight((prev, provider) => React.cloneElement(provider, {}, prev))
The last element of the array is the content of the app.
Using reduceRight
we preserve the nesting to make the HelloWorld
element a child of all the providers.
To make it simpler to use we can implement a MultiProvider
component.
import React from 'react'const nest = ( children: React.ReactNode, component: React.ReactElement) => React.cloneElement(component, {}, children)export type MultiProviderProps = React.PropsWithChildren<{ providers: React.ReactElement[]}>const MultiProvider: React.FC<MultiProviderProps> = ({ children, providers}) => ( <React.Fragment> {providers.reduceRight(nest, children)} </React.Fragment>)export default MultiProvider
Now we can refactor the example using the MultiProvider
.
const App = () => { return ( <MultiProvider providers={[ <ReduxProvider value={store} />, <ThemeProvider value={theme} />, <OtherProvider value={otherValue} />, <OtherOtherProvider value={otherOtherValue} />, // ...others, <HellProvider value={hell} />, ]} > <HelloWorld /> </MultiProvider> )}
You can find an implementation of MultiProvider
inside the react-pendulum library.
alfredosalzillo / react-pendulum
A React context utility library
react-pendulum
Use the power of the Pendulum and change the course of the duel!
react-pendulum a React Context utility libraries
Install
Using npm
npm install --save react-pendulum
Using yarn
yarn add react-pendulum
Components
MultiProvider
A component to nicely and readably wrap components with multiple providers
Props
providers
the array of providers instances to wrap to thechildren
import React, { Component, createContext } from 'react'import { MultiProvider } from 'pendulum'const FirstNameContext = createContext<string>('John')const LastNameContext = createContext<string>('Doe')const HelloWorld = () => { const firstName = useContext(FirstNameContext) const lastName = useContext(LastNameContext) return <>{`Hello ${firstName} ${lastName}`}</>}class App extends Component { render() { return ( <MultiProvider providers={[ <
Original Link: https://dev.to/alfredosalzillo/the-react-context-hell-7p4
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