@salesforce/design-system-react/components/popover/__examples__/header.jsx

Salesforce Lightning Design System for React

import React from 'react';
import createReactClass from 'create-react-class';
import IconSettings from '~/components/icon-settings';
import Popover from '~/components/popover'; // `~` is replaced with design-system-react at runtime
import Button from '~/components/button';

const Example = createReactClass({
	displayName: 'PopoverExample',

	render () {
		return (
			<IconSettings iconPath="/assets/icons">
				<div>
					<Popover
						body="Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua."
						heading="Header Title"
					>
						<Button label="Trigger Popover" />
					</Popover>
				</div>
			</IconSettings>
		);
	},
});

export default Example; // export is replaced with `ReactDOM.render(<Example />, mountNode);` at runtime