Crash with using private method of class-based component

[morrighan]

Environments

-	Version
Node.js	14.17.3
ESLint	7.32.0
eslint-plugin-react	7.24.0

Error stack

TypeError: Cannot read property 'toLowerCase' of undefined
Occurred while linting $PROJECT_DIR/$COMPONENT_FILE:$LINE_NUMBER
    at $PROJECT_DIR/node_modules/eslint-plugin-react/lib/rules/no-typos.js:181:50
    at Array.forEach (<anonymous>)
    at reportErrorIfLifecycleMethodCasingTypo ($PROJECT_DIR/node_modules/eslint-plugin-react/lib/rules/no-typos.js:180:25)
    at Object.MethodDefinition ($PROJECT_DIR/node_modules/eslint-plugin-react/lib/rules/no-typos.js:256:9)
    at updatedRuleInstructions.<computed> ($PROJECT_DIR/node_modules/eslint-plugin-react/lib/util/Components.js:1016:45)
    at $PROJECT_DIR/node_modules/eslint/lib/linter/safe-emitter.js:45:58
    at Array.forEach (<anonymous>)
    at Object.emit ($PROJECT_DIR/node_modules/eslint/lib/linter/safe-emitter.js:45:38)
    at NodeEventGenerator.applySelector ($PROJECT_DIR/node_modules/eslint/lib/linter/node-event-generator.js:293:26)
    at NodeEventGenerator.applySelectors ($PROJECT_DIR/node_modules/eslint/lib/linter/node-event-generator.js:322:22)

Reproducible code

import React from 'react';

export default class Editor extends React.Component {
	#somethingPrivate() {
		// ...
	}

    render() {
		const { value = '' } = this.props;

		return (
			<textarea>
				{value}
			</textarea>
		);
	}
}

Situation description

The whole ESLint watching process has crashed by only just make the method private; write # symbol.

[ljharb]

What's your eslint config that allows that to parse?

[morrighan]

I just using Airbnb's configuration.

[morrighan]

🙌🏻 @ljharb 🎉