eslint-plugin-react/docs/rules/react-in-jsx-scope.md

Prevent missing React when using JSX (react/react-in-jsx-scope)

When using JSX, <a /> expands to React.createElement("a"). Therefore the React variable must be in scope.

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

Rule Details

The following patterns are considered warnings:

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

/** @jsx Foo.bar */
var React = require('react');

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

The following patterns are not considered warnings:

import React from 'react';

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

var React = require('react');

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

/** @jsx Foo.bar */
var Foo = require('foo');

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

When Not To Use It

If you are setting React as a global variable you can disable this rule.