React’ Must Be in Scope When Using Jsx React/react-in-jsx-scope?

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

If you’ve encountered the error message “React’ must be in scope when using JSX react/react-in-jsx-scope” while working with JSX in your React project, don’t worry! This error is quite common and can be easily fixed. In this blog post, we will explore the possible solutions to resolve this issue.

Solution 1: Importing React

The most common cause of this error is forgetting to import React at the top of your file. Make sure you have the following import statement at the beginning of your file:

import React from 'react';

This import statement ensures that React is in scope and available for use in your JSX code.

Solution 2: Using React.Fragment

If you have already imported React but still encounter the error, another solution is to use React.Fragment instead of a regular HTML element as the root of your JSX code. React.Fragment is a built-in component that allows you to group multiple elements without adding an extra DOM node.

{`import React from 'react';

const MyComponent = () => (
  
    

Hello, World!

This is a JSX component.
);`}

By using React.Fragment, you don’t need to wrap your JSX code in a div or any other HTML element.

Solution 3: Using a Babel Plugin

If you prefer not to import React explicitly in every file or use React.Fragment, you can also configure your Babel setup to automatically add the necessary import statements for you. To achieve this, you can use the babel-plugin-transform-react-jsx plugin.

First, install the plugin:

npm install --save-dev @babel/plugin-transform-react-jsx

Then, add the plugin to your Babel configuration (e.g., .babelrc or babel.config.js):

{
  "plugins": [
    ["@babel/plugin-transform-react-jsx", {
      "pragma": "React.createElement",
      "pragmaFrag": "React.Fragment"
    }]
  ]
}

With this plugin, you no longer need to import React explicitly, and you can use JSX without encountering the “React’ must be in scope” error.

Conclusion

The “React’ must be in scope when using JSX react/react-in-jsx-scope” error is usually caused by forgetting to import React or not using React.Fragment as the root of your JSX code. By following the solutions provided in this blog post, you should be able to resolve this error and continue working with JSX in your React projects seamlessly.


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