React must be in scope when using jsx как исправить - Исправление ошибок и поиск оптимальных решений проблем

I am an Angular Developer and new to React , This is simple react Component but not working

import react , { Component}  from 'react';
import         { render   }  from 'react-dom';

class TechView extends Component {

    constructor(props){
       super(props);
       this.state = {
           name:'Gopinath'
       }
    }
    render(){
        return(
            <span>hello Tech View</span>
        );
    }
}

export default TechView;

Error :
‘React’ must be in scope when using JSX react/react-in-jsx-scope

asked Mar 7, 2017 at 5:06

The import line should be:

import React, { Component }  from 'react';

Note the uppercase R for React.

answered Mar 7, 2017 at 5:41

patrickpatrick

9,2883 gold badges20 silver badges27 bronze badges

Add below setting to .eslintrc.js / .eslintrc.json to ignore these errors:

  rules: {
    // suppress errors for missing 'import React' in files
   "react/react-in-jsx-scope": "off",
    // allow jsx syntax in js files (for next.js project)
   "react/jsx-filename-extension": [1, { "extensions": [".js", ".jsx"] }], //should add ".ts" if typescript project
  }

Why?
If you’re using NEXT.js then you do not require to import React at top of files, nextjs does that for you.

Ref: https://gourav.io/blog/nextjs-cheatsheet (Next.js cheatsheet)

answered Apr 11, 2020 at 17:25

GorvGoylGorvGoyl

38.7k26 gold badges213 silver badges205 bronze badges

If you’re using React v17, you can safely disable the rule in your eslint configuration file:

"rules": {
   ...
    "react/react-in-jsx-scope": "off"
   ...
}

answered Jul 9, 2021 at 11:25

Paul Razvan BergPaul Razvan Berg

14.4k9 gold badges70 silver badges104 bronze badges

For those who still don’t get the accepted solution :

Add

import React from 'react'
import ReactDOM from 'react-dom'

at the top of the file.

answered Aug 16, 2018 at 20:24

Ankit PandeyAnkit Pandey

1,6741 gold badge18 silver badges21 bronze badges

If you are running React 17+ (and in 2022, I assume, that you are) — you need to add the following line to your .eslintrc:

{
  "extends": ["plugin:react/jsx-runtime"]
}

Then only import React once in your top-level file, like App.jsx — and no need to import it anywhere else, unless you need an api like useEffect etc.

answered May 16, 2022 at 13:11

avalanche1avalanche1

2,7781 gold badge28 silver badges35 bronze badges

import React, { Component } from 'react';

This is a spelling error, you need to type React instead of react.

AkaZecik

9402 gold badges11 silver badges15 bronze badges

answered Jan 31, 2019 at 7:14

add "plugin:react/jsx-runtime" to extends in your eslint config file, refer react-in-jsx-scope

answered Dec 19, 2021 at 3:26

JayMGuravJayMGurav

1161 silver badge3 bronze badges

If you’d like to automate the inclusion of import React from 'react' for all files that use jsx syntax, install the react-require babel plugin:

npm install babel-plugin-react-require --save-dev

Add react-require into .babelrc. This plugin should be defined before transform-es2015-modules-commonjs plugin because it’s using ES2015 modules syntax to import React into scope.

{
  "plugins": [
    "react-require"
  ]
}

Source: https://www.npmjs.com/package/babel-plugin-react-require

answered Mar 12, 2021 at 21:46

James GentesJames Gentes

7,2385 gold badges43 silver badges61 bronze badges

The error is very straight forward, you imported react instead of React.

answered Oct 28, 2020 at 6:26

Saurabh BhatiaSaurabh Bhatia

1,8751 gold badge19 silver badges29 bronze badges

In my case, I had to include this two-line in my index.js file from the src folder.

import React from 'react'
import ReactDOM from 'react-dom'

In your case, this might be different.
You may need to include components if you’re using class-based components.

import React, { Component }  from 'react';

Alternatively, If you are using eslint you can get some solutions from the above comments.

know more

answered Dec 26, 2021 at 20:57

When using the react framework, you first need to import the react from react and always keep the first letter of react in uppercase after import.

import React, {Component} from 'react'`

import React, { Component} from 'react';
import { render }  from 'react-dom';

class TechView extends Component {

    constructor(props){
       super(props);
       this.state = {
           name:'Gopinath'
       } 
    }
    render(){
        return(
            <span>hello Tech View</span>
        );
    }
}
export default TechView;

Vishnu

4176 silver badges14 bronze badges

answered Feb 26, 2022 at 14:39

I had the similar issue.

Got fixed after i added the code below in the main component: App.js
If you have other components, make sure to import react in those files too.

import React from "react";

answered Nov 27, 2022 at 15:55

AbhishekAbhishek

3613 silver badges11 bronze badges

Whenever we make a custom component in React using JSX, it is transformed into backward-compatible JS code with the help of Babel.
Since the JSX compiles into React.createElement, the React library must also always be in scope.

Example:

This custom component:

<MyButton color="blue" shadowSize={2}> Click Me </MyButton>

is transformed into:

React.createElement(MyButton, {color: 'blue', shadowSize: 2}, 'Click Me')
^^^^^

Since the converted code needs the React library, we need to import it into the scope.

React Docs Reference

Fix: Import React

import React from 'react';
// or
import * as React from 'react';

Pick one, it depends on the user!

NOTE:
As of React 17+, we are free from doing such import, but it’s better to add the imports just to be on the safe side because errors can be generated because of ESLint!

One can disable the rule in the ESLint config file (.eslintrc.json) to ignore these errors:

"rules": {
    "react/react-in-jsx-scope": "off"
}

answered May 31, 2022 at 13:01

VishnuVishnu

4176 silver badges14 bronze badges

This is an error caused by importing the wrong module react from ‘react’ how about you try this:
1st

import React , { Component}  from 'react';

2nd Or you can try this as well:

import React from 'react';
import { render   }  from 'react-dom';

class TechView extends React.Component {

    constructor(props){
       super(props);
       this.state = {
           name:'Gopinath',
       }
    }
    render(){
        return(
            <span>hello Tech View</span>
        );
    }
}

export default TechView;

answered Aug 14, 2020 at 18:44

for me I got this issue once I used npm audit fix --force so it downgrade react-scripts to version 2 and it forces me to install eslint versions 5 and issues started to flood, to fix this I have update it again react-scripts and things worked out.
Also make sure that your eslint contains those rules

module.exports = {
  extends: ['react-app', 'react-app/jest', 'airbnb', 'prettier'],
  plugins: ['prettier'],
  rules: {
    ...
    // React scope no longer necessary with new JSX transform
    'react/react-in-jsx-scope': 'off',
    // Allow .js files to use JSX syntax
    'react/jsx-filename-extension': ['error', { extensions: ['.js', '.jsx'] }],
    ...
  },
}

answered Nov 27, 2022 at 23:11

DINA TAKLITDINA TAKLIT

5,9429 gold badges62 silver badges72 bronze badges

Upgrading the react-scripts version to latest solved my problem.

I was using the react-scripts version 0.9.5 and upgrading it to 5.0.1 did the job.

answered Jul 17, 2022 at 15:03

One thing that I noticed is that import React from «react»; should be there instead of import react , { Component} from 'react';
Other Things I have done is,

(1) added below lines to index.js file.

import React from 'react'
import ReactDOM from 'react-dom'

if not worked add this line for ReactDOM import ReactDOM from "react-dom/client"; instead of import ReactDOM from 'react-dom'

(2) change following properties for eslint configuration file.

  rules: {
   "react/react-in-jsx-scope": "off",
  }

But Starting from React 17,Dont need to add import React from ‘react’ and next js as well

answered Jul 17, 2022 at 15:52

The line below solved this problem for me.

/** @jsx jsx */
import {css, jsx} from "@emotion/react";

hope this help you.

answered Jul 18, 2022 at 16:03

يعقوبيعقوب

85812 silver badges14 bronze badges

Follow as in picture for removing that lint error and adding automatic fix by addin g—fix in package.json

answered Jan 16, 2021 at 18:18

NikeNike

976 bronze badges

in babel, add "runtime": "automatic" option

{
  "presets": [
    [
      "@babel/preset-react",
      {
        "runtime": "automatic"
      }
    ],
    "@babel/preset-env"
  ],
  "plugins": [
    
  ]
}

answered 17 hours ago

YilmazYilmaz

26.1k10 gold badges131 silver badges162 bronze badges

Источник

I am an Angular Developer and new to React , This is simple react Component but not working

import react , { Component}  from 'react';
import         { render   }  from 'react-dom';

class TechView extends Component {

    constructor(props){
       super(props);
       this.state = {
           name:'Gopinath'
       }
    }
    render(){
        return(
            <span>hello Tech View</span>
        );
    }
}

export default TechView;

Error :
‘React’ must be in scope when using JSX react/react-in-jsx-scope

asked Mar 7, 2017 at 5:06

The import line should be:

import React, { Component }  from 'react';

Note the uppercase R for React.

answered Mar 7, 2017 at 5:41

patrickpatrick

9,2883 gold badges20 silver badges27 bronze badges

Add below setting to .eslintrc.js / .eslintrc.json to ignore these errors:

  rules: {
    // suppress errors for missing 'import React' in files
   "react/react-in-jsx-scope": "off",
    // allow jsx syntax in js files (for next.js project)
   "react/jsx-filename-extension": [1, { "extensions": [".js", ".jsx"] }], //should add ".ts" if typescript project
  }

Why?
If you’re using NEXT.js then you do not require to import React at top of files, nextjs does that for you.

Ref: https://gourav.io/blog/nextjs-cheatsheet (Next.js cheatsheet)

answered Apr 11, 2020 at 17:25

GorvGoylGorvGoyl

38.7k26 gold badges213 silver badges205 bronze badges

If you’re using React v17, you can safely disable the rule in your eslint configuration file:

"rules": {
   ...
    "react/react-in-jsx-scope": "off"
   ...
}

answered Jul 9, 2021 at 11:25

Paul Razvan BergPaul Razvan Berg

14.4k9 gold badges70 silver badges104 bronze badges

For those who still don’t get the accepted solution :

Add

import React from 'react'
import ReactDOM from 'react-dom'

at the top of the file.

answered Aug 16, 2018 at 20:24

Ankit PandeyAnkit Pandey

1,6741 gold badge18 silver badges21 bronze badges

If you are running React 17+ (and in 2022, I assume, that you are) — you need to add the following line to your .eslintrc:

{
  "extends": ["plugin:react/jsx-runtime"]
}

Then only import React once in your top-level file, like App.jsx — and no need to import it anywhere else, unless you need an api like useEffect etc.

answered May 16, 2022 at 13:11

avalanche1avalanche1

2,7781 gold badge28 silver badges35 bronze badges

import React, { Component } from 'react';

This is a spelling error, you need to type React instead of react.

AkaZecik

9402 gold badges11 silver badges15 bronze badges

answered Jan 31, 2019 at 7:14

add "plugin:react/jsx-runtime" to extends in your eslint config file, refer react-in-jsx-scope

answered Dec 19, 2021 at 3:26

JayMGuravJayMGurav

1161 silver badge3 bronze badges

If you’d like to automate the inclusion of import React from 'react' for all files that use jsx syntax, install the react-require babel plugin:

npm install babel-plugin-react-require --save-dev

Add react-require into .babelrc. This plugin should be defined before transform-es2015-modules-commonjs plugin because it’s using ES2015 modules syntax to import React into scope.

{
  "plugins": [
    "react-require"
  ]
}

Source: https://www.npmjs.com/package/babel-plugin-react-require

answered Mar 12, 2021 at 21:46

James GentesJames Gentes

7,2385 gold badges43 silver badges61 bronze badges

The error is very straight forward, you imported react instead of React.

answered Oct 28, 2020 at 6:26

Saurabh BhatiaSaurabh Bhatia

1,8751 gold badge19 silver badges29 bronze badges

In my case, I had to include this two-line in my index.js file from the src folder.

import React from 'react'
import ReactDOM from 'react-dom'

In your case, this might be different.
You may need to include components if you’re using class-based components.

import React, { Component }  from 'react';

Alternatively, If you are using eslint you can get some solutions from the above comments.

know more

answered Dec 26, 2021 at 20:57

When using the react framework, you first need to import the react from react and always keep the first letter of react in uppercase after import.

import React, {Component} from 'react'`

import React, { Component} from 'react';
import { render }  from 'react-dom';

class TechView extends Component {

    constructor(props){
       super(props);
       this.state = {
           name:'Gopinath'
       } 
    }
    render(){
        return(
            <span>hello Tech View</span>
        );
    }
}
export default TechView;

Vishnu

4176 silver badges14 bronze badges

answered Feb 26, 2022 at 14:39

I had the similar issue.

Got fixed after i added the code below in the main component: App.js
If you have other components, make sure to import react in those files too.

import React from "react";

answered Nov 27, 2022 at 15:55

AbhishekAbhishek

3613 silver badges11 bronze badges

Example:

This custom component:

<MyButton color="blue" shadowSize={2}> Click Me </MyButton>

is transformed into:

React.createElement(MyButton, {color: 'blue', shadowSize: 2}, 'Click Me')
^^^^^

Since the converted code needs the React library, we need to import it into the scope.

React Docs Reference

Fix: Import React

import React from 'react';
// or
import * as React from 'react';

Pick one, it depends on the user!

NOTE:
As of React 17+, we are free from doing such import, but it’s better to add the imports just to be on the safe side because errors can be generated because of ESLint!

One can disable the rule in the ESLint config file (.eslintrc.json) to ignore these errors:

"rules": {
    "react/react-in-jsx-scope": "off"
}

answered May 31, 2022 at 13:01

VishnuVishnu

4176 silver badges14 bronze badges

This is an error caused by importing the wrong module react from ‘react’ how about you try this:
1st

import React , { Component}  from 'react';

2nd Or you can try this as well:

import React from 'react';
import { render   }  from 'react-dom';

class TechView extends React.Component {

    constructor(props){
       super(props);
       this.state = {
           name:'Gopinath',
       }
    }
    render(){
        return(
            <span>hello Tech View</span>
        );
    }
}

export default TechView;

answered Aug 14, 2020 at 18:44

module.exports = {
  extends: ['react-app', 'react-app/jest', 'airbnb', 'prettier'],
  plugins: ['prettier'],
  rules: {
    ...
    // React scope no longer necessary with new JSX transform
    'react/react-in-jsx-scope': 'off',
    // Allow .js files to use JSX syntax
    'react/jsx-filename-extension': ['error', { extensions: ['.js', '.jsx'] }],
    ...
  },
}

answered Nov 27, 2022 at 23:11

DINA TAKLITDINA TAKLIT

5,9429 gold badges62 silver badges72 bronze badges

Upgrading the react-scripts version to latest solved my problem.

I was using the react-scripts version 0.9.5 and upgrading it to 5.0.1 did the job.

answered Jul 17, 2022 at 15:03

One thing that I noticed is that import React from «react»; should be there instead of import react , { Component} from 'react';
Other Things I have done is,

(1) added below lines to index.js file.

import React from 'react'
import ReactDOM from 'react-dom'

if not worked add this line for ReactDOM import ReactDOM from "react-dom/client"; instead of import ReactDOM from 'react-dom'

(2) change following properties for eslint configuration file.

  rules: {
   "react/react-in-jsx-scope": "off",
  }

But Starting from React 17,Dont need to add import React from ‘react’ and next js as well

answered Jul 17, 2022 at 15:52

The line below solved this problem for me.

/** @jsx jsx */
import {css, jsx} from "@emotion/react";

hope this help you.

answered Jul 18, 2022 at 16:03

يعقوبيعقوب

85812 silver badges14 bronze badges

Follow as in picture for removing that lint error and adding automatic fix by addin g—fix in package.json

answered Jan 16, 2021 at 18:18

NikeNike

976 bronze badges

in babel, add "runtime": "automatic" option

{
  "presets": [
    [
      "@babel/preset-react",
      {
        "runtime": "automatic"
      }
    ],
    "@babel/preset-env"
  ],
  "plugins": [
    
  ]
}

answered 17 hours ago

YilmazYilmaz

26.1k10 gold badges131 silver badges162 bronze badges

Источник

I am an Angular Developer and new to React , This is simple react Component but not working

import react , { Component}  from 'react';
import         { render   }  from 'react-dom';

class TechView extends Component {

    constructor(props){
       super(props);
       this.state = {
           name:'Gopinath'
       }
    }
    render(){
        return(
            <span>hello Tech View</span>
        );
    }
}

export default TechView;

Error :
‘React’ must be in scope when using JSX react/react-in-jsx-scope

asked Mar 7, 2017 at 5:06

The import line should be:

import React, { Component }  from 'react';

Note the uppercase R for React.

answered Mar 7, 2017 at 5:41

patrickpatrick

9,2883 gold badges20 silver badges27 bronze badges

Add below setting to .eslintrc.js / .eslintrc.json to ignore these errors:

  rules: {
    // suppress errors for missing 'import React' in files
   "react/react-in-jsx-scope": "off",
    // allow jsx syntax in js files (for next.js project)
   "react/jsx-filename-extension": [1, { "extensions": [".js", ".jsx"] }], //should add ".ts" if typescript project
  }

Why?
If you’re using NEXT.js then you do not require to import React at top of files, nextjs does that for you.

Ref: https://gourav.io/blog/nextjs-cheatsheet (Next.js cheatsheet)

answered Apr 11, 2020 at 17:25

GorvGoylGorvGoyl

38.7k26 gold badges213 silver badges205 bronze badges

If you’re using React v17, you can safely disable the rule in your eslint configuration file:

"rules": {
   ...
    "react/react-in-jsx-scope": "off"
   ...
}

answered Jul 9, 2021 at 11:25

Paul Razvan BergPaul Razvan Berg

14.4k9 gold badges70 silver badges104 bronze badges

For those who still don’t get the accepted solution :

Add

import React from 'react'
import ReactDOM from 'react-dom'

at the top of the file.

answered Aug 16, 2018 at 20:24

Ankit PandeyAnkit Pandey

1,6741 gold badge18 silver badges21 bronze badges

If you are running React 17+ (and in 2022, I assume, that you are) — you need to add the following line to your .eslintrc:

{
  "extends": ["plugin:react/jsx-runtime"]
}

Then only import React once in your top-level file, like App.jsx — and no need to import it anywhere else, unless you need an api like useEffect etc.

answered May 16, 2022 at 13:11

avalanche1avalanche1

2,7781 gold badge28 silver badges35 bronze badges

import React, { Component } from 'react';

This is a spelling error, you need to type React instead of react.

AkaZecik

9402 gold badges11 silver badges15 bronze badges

answered Jan 31, 2019 at 7:14

add "plugin:react/jsx-runtime" to extends in your eslint config file, refer react-in-jsx-scope

answered Dec 19, 2021 at 3:26

JayMGuravJayMGurav

1161 silver badge3 bronze badges

If you’d like to automate the inclusion of import React from 'react' for all files that use jsx syntax, install the react-require babel plugin:

npm install babel-plugin-react-require --save-dev

Add react-require into .babelrc. This plugin should be defined before transform-es2015-modules-commonjs plugin because it’s using ES2015 modules syntax to import React into scope.

{
  "plugins": [
    "react-require"
  ]
}

Source: https://www.npmjs.com/package/babel-plugin-react-require

answered Mar 12, 2021 at 21:46

James GentesJames Gentes

7,2385 gold badges43 silver badges61 bronze badges

The error is very straight forward, you imported react instead of React.

answered Oct 28, 2020 at 6:26

Saurabh BhatiaSaurabh Bhatia

1,8751 gold badge19 silver badges29 bronze badges

In my case, I had to include this two-line in my index.js file from the src folder.

import React from 'react'
import ReactDOM from 'react-dom'

In your case, this might be different.
You may need to include components if you’re using class-based components.

import React, { Component }  from 'react';

Alternatively, If you are using eslint you can get some solutions from the above comments.

know more

answered Dec 26, 2021 at 20:57

When using the react framework, you first need to import the react from react and always keep the first letter of react in uppercase after import.

import React, {Component} from 'react'`

import React, { Component} from 'react';
import { render }  from 'react-dom';

class TechView extends Component {

    constructor(props){
       super(props);
       this.state = {
           name:'Gopinath'
       } 
    }
    render(){
        return(
            <span>hello Tech View</span>
        );
    }
}
export default TechView;

Vishnu

4176 silver badges14 bronze badges

answered Feb 26, 2022 at 14:39

I had the similar issue.

Got fixed after i added the code below in the main component: App.js
If you have other components, make sure to import react in those files too.

import React from "react";

answered Nov 27, 2022 at 15:55

AbhishekAbhishek

3613 silver badges11 bronze badges

Example:

This custom component:

<MyButton color="blue" shadowSize={2}> Click Me </MyButton>

is transformed into:

React.createElement(MyButton, {color: 'blue', shadowSize: 2}, 'Click Me')
^^^^^

Since the converted code needs the React library, we need to import it into the scope.

React Docs Reference

Fix: Import React

import React from 'react';
// or
import * as React from 'react';

Pick one, it depends on the user!

NOTE:
As of React 17+, we are free from doing such import, but it’s better to add the imports just to be on the safe side because errors can be generated because of ESLint!

One can disable the rule in the ESLint config file (.eslintrc.json) to ignore these errors:

"rules": {
    "react/react-in-jsx-scope": "off"
}

answered May 31, 2022 at 13:01

VishnuVishnu

4176 silver badges14 bronze badges

This is an error caused by importing the wrong module react from ‘react’ how about you try this:
1st

import React , { Component}  from 'react';

2nd Or you can try this as well:

import React from 'react';
import { render   }  from 'react-dom';

class TechView extends React.Component {

    constructor(props){
       super(props);
       this.state = {
           name:'Gopinath',
       }
    }
    render(){
        return(
            <span>hello Tech View</span>
        );
    }
}

export default TechView;

answered Aug 14, 2020 at 18:44

module.exports = {
  extends: ['react-app', 'react-app/jest', 'airbnb', 'prettier'],
  plugins: ['prettier'],
  rules: {
    ...
    // React scope no longer necessary with new JSX transform
    'react/react-in-jsx-scope': 'off',
    // Allow .js files to use JSX syntax
    'react/jsx-filename-extension': ['error', { extensions: ['.js', '.jsx'] }],
    ...
  },
}

answered Nov 27, 2022 at 23:11

DINA TAKLITDINA TAKLIT

5,9429 gold badges62 silver badges72 bronze badges

Upgrading the react-scripts version to latest solved my problem.

I was using the react-scripts version 0.9.5 and upgrading it to 5.0.1 did the job.

answered Jul 17, 2022 at 15:03

One thing that I noticed is that import React from «react»; should be there instead of import react , { Component} from 'react';
Other Things I have done is,

(1) added below lines to index.js file.

import React from 'react'
import ReactDOM from 'react-dom'

if not worked add this line for ReactDOM import ReactDOM from "react-dom/client"; instead of import ReactDOM from 'react-dom'

(2) change following properties for eslint configuration file.

  rules: {
   "react/react-in-jsx-scope": "off",
  }

But Starting from React 17,Dont need to add import React from ‘react’ and next js as well

answered Jul 17, 2022 at 15:52

The line below solved this problem for me.

/** @jsx jsx */
import {css, jsx} from "@emotion/react";

hope this help you.

answered Jul 18, 2022 at 16:03

يعقوبيعقوب

85812 silver badges14 bronze badges

Follow as in picture for removing that lint error and adding automatic fix by addin g—fix in package.json

answered Jan 16, 2021 at 18:18

NikeNike

976 bronze badges

in babel, add "runtime": "automatic" option

{
  "presets": [
    [
      "@babel/preset-react",
      {
        "runtime": "automatic"
      }
    ],
    "@babel/preset-env"
  ],
  "plugins": [
    
  ]
}

answered 17 hours ago

YilmazYilmaz

26.1k10 gold badges131 silver badges162 bronze badges

Источник

`React must be in scope when using JSX`

Quite an annoying error, right ? What does it even mean anyway, you simply wrote a pretty basic component, and nothing happen but this error.

You don’t know how to fix it ? Or you never bothered looking at why you need to do so ? Or maybe you heard that the versions 17+ of React dispense us from doing so, but still getting the error ?

You’re at the right place, we’ll go through the why, up to the how. Feel free to skip any part with the table of contents below.

Got your coffee ? ☕ Let’s dive in.

Why are we getting this error ?
How to fix ?
React version 17 and beyond

Why are we getting this error ?

First, in order to understand why, you need to know how the JSX synthax work. For a complete breakdown, feel free to read this previous blog post that I wrote.

For a quick answer, let’s analyse a React component :

<CustomButton color='red'>Click me !</CustomButton>

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This example come directly from the React official documentation

When React receive this component, it basically transform into this :

React.createElement(CustomButton, { color: 'red' }, 'Click me !');

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Because JSX is nothing but syntactic sugar for the createElement function, the code above will be called when creating our component.
But .. In the context of our file, we never imported React. What will happen ?

Exactly : React must be in scope when using JSX.

If we don’t import it at the top of our file, the React.createElement would crash, as React would be undefined.

How to fix ?

As stated before, you need to import React within your file, in order for the script to resolve properly the createElement function. From here, you have multiple choices :

import React from 'react';
// or
import * as React from 'react';

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Feel free to refer this Dan Abramov tweet for more informations.

At the end, it’s up to your preferences, there’s no immediate downsides using one or the other.

Wait, didn’t you say that in version 17+ we don’t need it anymore ? Indeed.

React version 17 and beyond

As of React v.17.0, we are now free from doing such import. If you want more informations, here’s the link for the official release notes from the React team.

If you want the quick explanation, they added some code for compilers (such as Babel) to plug in, and add the import themselves when compiling our JSX. Hot stuff, right ?

But you might still get the error.

What ?

Yes, but it’s not from React ! As we said before, most of the time, the projects use a linting tool such as Eslint, and some specific set of rules as been created for React. One of them enforce you to import React if it detect any JSX within the file.

If you’re using React v.17.0 and beyond, you can freely disable the rules.

"react/jsx-uses-react": "off",
"react/react-in-jsx-scope": "off"

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You can now remove all the

import React from 'react';

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Before your finished your coffee, you learned why we needed to import React with JSX.
I hope you enjoyed the read, and learned as much as I did. If you have any questions or comments, feel free to reach to me on Twitter or in the comments below. Have a nice day !

Источник

I am an Angular Developer and new to React , This is simple react Component but not working

import react , { Component}  from 'react';
import         { render   }  from 'react-dom';

class TechView extends Component {

    constructor(props){
       super(props);
       this.state = {
           name:'Gopinath'
       }
    }
    render(){
        return(
            <span>hello Tech View</span>
        );
    }
}

export default TechView;

Error :
‘React’ must be in scope when using JSX react/react-in-jsx-scope

asked Mar 7, 2017 at 5:06

The import line should be:

import React, { Component }  from 'react';

Note the uppercase R for React.

answered Mar 7, 2017 at 5:41

patrickpatrick

9,2883 gold badges20 silver badges27 bronze badges

Add below setting to .eslintrc.js / .eslintrc.json to ignore these errors:

  rules: {
    // suppress errors for missing 'import React' in files
   "react/react-in-jsx-scope": "off",
    // allow jsx syntax in js files (for next.js project)
   "react/jsx-filename-extension": [1, { "extensions": [".js", ".jsx"] }], //should add ".ts" if typescript project
  }

Why?
If you’re using NEXT.js then you do not require to import React at top of files, nextjs does that for you.

Ref: https://gourav.io/blog/nextjs-cheatsheet (Next.js cheatsheet)

answered Apr 11, 2020 at 17:25

GorvGoylGorvGoyl

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If you’re using React v17, you can safely disable the rule in your eslint configuration file:

"rules": {
   ...
    "react/react-in-jsx-scope": "off"
   ...
}

answered Jul 9, 2021 at 11:25

Paul Razvan BergPaul Razvan Berg

14.4k9 gold badges70 silver badges104 bronze badges

For those who still don’t get the accepted solution :

Add

import React from 'react'
import ReactDOM from 'react-dom'

at the top of the file.

answered Aug 16, 2018 at 20:24

Ankit PandeyAnkit Pandey

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If you are running React 17+ (and in 2022, I assume, that you are) — you need to add the following line to your .eslintrc:

{
  "extends": ["plugin:react/jsx-runtime"]
}

Then only import React once in your top-level file, like App.jsx — and no need to import it anywhere else, unless you need an api like useEffect etc.

answered May 16, 2022 at 13:11

avalanche1avalanche1

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import React, { Component } from 'react';

This is a spelling error, you need to type React instead of react.

AkaZecik

9402 gold badges11 silver badges15 bronze badges

answered Jan 31, 2019 at 7:14

add "plugin:react/jsx-runtime" to extends in your eslint config file, refer react-in-jsx-scope

answered Dec 19, 2021 at 3:26

JayMGuravJayMGurav

1161 silver badge3 bronze badges

If you’d like to automate the inclusion of import React from 'react' for all files that use jsx syntax, install the react-require babel plugin:

npm install babel-plugin-react-require --save-dev

Add react-require into .babelrc. This plugin should be defined before transform-es2015-modules-commonjs plugin because it’s using ES2015 modules syntax to import React into scope.

{
  "plugins": [
    "react-require"
  ]
}

Source: https://www.npmjs.com/package/babel-plugin-react-require

answered Mar 12, 2021 at 21:46

James GentesJames Gentes

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The error is very straight forward, you imported react instead of React.

answered Oct 28, 2020 at 6:26

Saurabh BhatiaSaurabh Bhatia

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In my case, I had to include this two-line in my index.js file from the src folder.

import React from 'react'
import ReactDOM from 'react-dom'

In your case, this might be different.
You may need to include components if you’re using class-based components.

import React, { Component }  from 'react';

Alternatively, If you are using eslint you can get some solutions from the above comments.

know more

answered Dec 26, 2021 at 20:57

When using the react framework, you first need to import the react from react and always keep the first letter of react in uppercase after import.

import React, {Component} from 'react'`

import React, { Component} from 'react';
import { render }  from 'react-dom';

class TechView extends Component {

    constructor(props){
       super(props);
       this.state = {
           name:'Gopinath'
       } 
    }
    render(){
        return(
            <span>hello Tech View</span>
        );
    }
}
export default TechView;

Vishnu

4176 silver badges14 bronze badges

answered Feb 26, 2022 at 14:39

I had the similar issue.

Got fixed after i added the code below in the main component: App.js
If you have other components, make sure to import react in those files too.

import React from "react";

answered Nov 27, 2022 at 15:55

AbhishekAbhishek

3613 silver badges11 bronze badges

Example:

This custom component:

<MyButton color="blue" shadowSize={2}> Click Me </MyButton>

is transformed into:

React.createElement(MyButton, {color: 'blue', shadowSize: 2}, 'Click Me')
^^^^^

Since the converted code needs the React library, we need to import it into the scope.

React Docs Reference

Fix: Import React

import React from 'react';
// or
import * as React from 'react';

Pick one, it depends on the user!

NOTE:
As of React 17+, we are free from doing such import, but it’s better to add the imports just to be on the safe side because errors can be generated because of ESLint!

One can disable the rule in the ESLint config file (.eslintrc.json) to ignore these errors:

"rules": {
    "react/react-in-jsx-scope": "off"
}

answered May 31, 2022 at 13:01

VishnuVishnu

4176 silver badges14 bronze badges

This is an error caused by importing the wrong module react from ‘react’ how about you try this:
1st

import React , { Component}  from 'react';

2nd Or you can try this as well:

import React from 'react';
import { render   }  from 'react-dom';

class TechView extends React.Component {

    constructor(props){
       super(props);
       this.state = {
           name:'Gopinath',
       }
    }
    render(){
        return(
            <span>hello Tech View</span>
        );
    }
}

export default TechView;

answered Aug 14, 2020 at 18:44

module.exports = {
  extends: ['react-app', 'react-app/jest', 'airbnb', 'prettier'],
  plugins: ['prettier'],
  rules: {
    ...
    // React scope no longer necessary with new JSX transform
    'react/react-in-jsx-scope': 'off',
    // Allow .js files to use JSX syntax
    'react/jsx-filename-extension': ['error', { extensions: ['.js', '.jsx'] }],
    ...
  },
}

answered Nov 27, 2022 at 23:11

DINA TAKLITDINA TAKLIT

5,9429 gold badges62 silver badges72 bronze badges

Upgrading the react-scripts version to latest solved my problem.

I was using the react-scripts version 0.9.5 and upgrading it to 5.0.1 did the job.

answered Jul 17, 2022 at 15:03

One thing that I noticed is that import React from «react»; should be there instead of import react , { Component} from 'react';
Other Things I have done is,

(1) added below lines to index.js file.

import React from 'react'
import ReactDOM from 'react-dom'

if not worked add this line for ReactDOM import ReactDOM from "react-dom/client"; instead of import ReactDOM from 'react-dom'

(2) change following properties for eslint configuration file.

  rules: {
   "react/react-in-jsx-scope": "off",
  }

But Starting from React 17,Dont need to add import React from ‘react’ and next js as well

answered Jul 17, 2022 at 15:52

The line below solved this problem for me.

/** @jsx jsx */
import {css, jsx} from "@emotion/react";

hope this help you.

answered Jul 18, 2022 at 16:03

يعقوبيعقوب

85812 silver badges14 bronze badges

Follow as in picture for removing that lint error and adding automatic fix by addin g—fix in package.json

answered Jan 16, 2021 at 18:18

NikeNike

976 bronze badges

in babel, add "runtime": "automatic" option

{
  "presets": [
    [
      "@babel/preset-react",
      {
        "runtime": "automatic"
      }
    ],
    "@babel/preset-env"
  ],
  "plugins": [
    
  ]
}

answered 17 hours ago

YilmazYilmaz

26.1k10 gold badges131 silver badges162 bronze badges

Источник

I am facing the following error: ‘React’ must be in scope when using JSX react/react-in-jsx-scope in ReactJS. We are going to Learn about All Possible Solutions So Lets Get Start with This Article.

Contents

How ‘React’ must be in scope when using JSX react/react-in-jsx-scope Error Occurs?
How To Solve ‘React’ must be in scope when using JSX react/react-in-jsx-scope Error?
Solution 1: Import Like This
Solution 2: disable the rule
Conclusion

I am facing the following error.

'React' must be in scope when using JSX react/react-in-jsx-scope

So here I am writing all the possible solutions that I have tried to resolve this error.

How To Solve ‘React’ must be in scope when using JSX react/react-in-jsx-scope Error?

How To Solve ‘React’ must be in scope when using JSX react/react-in-jsx-scope Error?
To Solve ‘React’ must be in scope when using JSX react/react-in-jsx-scope Error Just disable the rule in Your eslint configuration file Just like this. First of all, Open your .eslintrc.js / .eslintrc.json and add the following line: “react/react-in-jsx-scope”: “off”, And Now, Your error must be solved. Thank You.
‘React’ must be in scope when using JSX react/react-in-jsx-scope
To Solve ‘React’ must be in scope when using JSX react/react-in-jsx-scope Error Maybe you are importing the wrong spelled React that’s why this error occurs. Just Import React like this: import React, { Component } from ‘react’; And Now, Your error must be solved. Thanks.

Solution 1: Import Like This

Maybe you are importing the wrong spelled React that’s why this error occurs. Just Import React like this.

import React, { Component }  from 'react';

And Now, Your error must be solved. Thanks.

Solution 2: disable the rule

Just disable the rule in Your eslint configuration file Just like this. First of all, Open your .eslintrc.js / .eslintrc.json and add the following line.

  "rules": {
   "react/react-in-jsx-scope": "off",  
   "react/jsx-filename-extension": [1, { "extensions": [".js", ".jsx"] }]
  }

And Now, Your error must be solved. Thank You.

Conclusion

It’s all About this error. Hope We solved Your error. Comment below Your thoughts and your queries. Also, Comment below which solution worked for you?

Also, Read

Module not found: Can’t resolve ‘react-router-dom’
How to Download File in React js?
How to Use .env File in React Project?
Attempted import error: ‘Redirect’ is not exported from ‘react-router-dom’
Attempted import error: ‘useHistory’ is not exported from ‘react-router-dom’

Источник

React must be in scope when using JSX

Table of contents

Why are we getting this error ?

How to fix ?

React version 17 and beyond

How To Solve ‘React’ must be in scope when using JSX react/react-in-jsx-scope Error?

Solution 1: Import Like This

Solution 2: disable the rule

Conclusion

`React must be in scope when using JSX`