英文:
Why do I need to import React from 'react' in the index.js file when it's not neccessary to import react anymore?
问题
> 我正在学习React.js。我看到在版本17之后不再需要导入React了。我的当前React版本是v18.2.0。我正在使用这段代码：
// import React from 'react';
import ReactDOM from 'react-dom/client';
import './index.css';
import App from './App';
const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
<React.StrictMode>
<App />
</React.StrictMode>
);
> 我遇到了这个错误：
编译失败。
[eslint]
src\index.js
第8行第4列：'React' 未定义 react/jsx-no-undef
搜索关键词以了解每个错误的详细信息。
[eslint] 中的错误
src\index.js
第8行第4列：'React' 未定义 react/jsx-no-undef
搜索关键词以了解每个错误的详细信息。
webpack编译时出现1个错误
我需要导入React吗？我该如何避免这个错误？
我已经注释掉了 import React from 'react'; 这行代码，但仍然遇到了上述错误。
英文:
> I am learning React.js. I saw that after version 17 it's no longer needed to import React anymore. My currrent react version is v18.2.0. I am using this code:
// import React from 'react';
import ReactDOM from 'react-dom/client';
import './index.css';
import App from './App';
const root = ReactDOM.createRoot(document.getElementById('root'));
root.render(
<React.StrictMode>
<App />
</React.StrictMode>
);
> I am getting this error:
Failed to compile.
[eslint]
src\index.js
Line 8:4: 'React' is not defined react/jsx-no-undef
Search for the keywords to learn more about each error.
ERROR in [eslint]
src\index.js
Line 8:4: 'React' is not defined react/jsx-no-undef
Search for the keywords to learn more about each error.
webpack compiled with 1 error
Do I have to import React from 'react'? What can I do to avoid this error?
I have commented out the import React from 'react'; line and I am getting the error mention above.
I expect my code to compile successfully..
答案1
得分: 1
这个错误是由于 eslint 而不是 React 导致的，在 React 17 中，JSX 转换发生了变化。
在你的 eslint 配置文件中，请关闭这些选项：
"react/jsx-uses-react": "off",
"react/react-in-jsx-scope": "off"
这样应该可以解决这个错误。
英文:
Simply this error comes from eslint not react as of react 17, jsx transformation has changed.
In you eslint config file, place turn these off:
"react/jsx-uses-react": "off",
"react/react-in-jsx-scope": "off"
This should clear the error
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