Rocket.Chat/client/components/burger/BurgerIcon.js

import { css } from '@rocket.chat/css-in-js';
import { Box } from '@rocket.chat/fuselage';
import { usePrefersReducedMotion } from '@rocket.chat/fuselage-hooks';
import React from 'react';

const Wrapper = ({ children }) =>
	<Box
		is='span'
		display='inline-flex'
		flexDirection='column'
		alignItems='center'
		justifyContent='space-between'
		size='x24'
		paddingBlock='x4'
		paddingInline='x2'
		verticalAlign='middle'
		children={children}
	/>;

const Line = ({ animated, moved }) =>
	<Box
		is='span'
		width='x20'
		height='x2'
		backgroundColor='currentColor'
		className={[
			animated && css`
				will-change: transform;
				transition: transform 0.2s ease-out;
			`,
			moved && css`
				&:nth-child(1),
				&:nth-child(3) {
					transform-origin: 50%, 50%, 0;
				}

				&:nth-child(1) {
					transform: translate(-25%, 3px) rotate(-45deg) scale(0.5, 1);
				}

				[dir=rtl] &:nth-child(1) {
					transform: translate(25%, 3px) rotate(45deg) scale(0.5, 1);
				}

				&:nth-child(3) {
					transform: translate(-25%, -3px) rotate(45deg) scale(0.5, 1);
				}

				[dir=rtl] &:nth-child(3) {
					transform: translate(25%, -3px) rotate(-45deg) scale(0.5, 1);
				}
			`,
		]}
		aria-hidden='true'
	/>;

function BurgerIcon({ children, open }) {
	const isReducedMotionPreferred = usePrefersReducedMotion();

	return <Wrapper>
		<Line animated={!isReducedMotionPreferred} moved={open} />
		<Line animated={!isReducedMotionPreferred} moved={open} />
		<Line animated={!isReducedMotionPreferred} moved={open} />
		{children}
	</Wrapper>;
}

export default BurgerIcon;