# react/jsx-uses-react

> 来自 [undefined](undefined) 的规则。

# Prevent React to be incorrectly marked as unused (react/jsx-uses-react)

JSX expands to a call to `React.createElement`, a file which includes `React`
but only uses JSX should consider the `React` variable as used.

If you are using the @jsx pragma this rule will mark the designated variable and not the `React` one.

This rule has no effect if the `no-unused-vars` rule is not enabled.

You can use the [shared settings](/README.md#configuration) to specify a custom pragma.

## Rule Details

Examples of **incorrect** code for this rule:

```js
var React = require("react");

// nothing to do with React
```

```jsx
/** @jsx Foo */
var React = require("react");

var Hello = <div>Hello {this.props.name}</div>;
```

Examples of **correct** code for this rule:

```jsx
var React = require("react");

var Hello = <div>Hello {this.props.name}</div>;
```

```jsx
/** @jsx Foo */
var Foo = require("foo");

var Hello = <div>Hello {this.props.name}</div>;
```

## When Not To Use It

If you are not using JSX, if React is declared as global variable, or if you do not use the `no-unused-vars` rule.

If you are using the [new JSX transform from React 17](https://reactjs.org/blog/2020/09/22/introducing-the-new-jsx-transform.html#removing-unused-react-imports), you should disable this rule by extending [`react/jsx-runtime`](https://github.com/yannickcr/eslint-plugin-react/blob/HEAD/index.js#L163-L176) in your eslint config (add `"plugin:react/jsx-runtime"` to `"extends"`).

## 参考文档

- [react/jsx-uses-react 官方文档](https://github.com/yannickcr/eslint-plugin-react/blob/HEAD/docs/rules/jsx-uses-react.md)