catstodon/app/javascript/mastodon/components/icon_with_badge.js

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import React from 'react';
import PropTypes from 'prop-types';
import Icon from 'mastodon/components/icon';
const formatNumber = num => num > 40 ? '40+' : num;
const IconWithBadge = ({ id, count, issueBadge, className }) => (
<i className='icon-with-badge'>
<Icon id={id} fixedWidth className={className} />
{count > 0 && <i className='icon-with-badge__badge'>{formatNumber(count)}</i>}
{issueBadge && <i className='icon-with-badge__issue-badge' />}
</i>
);
IconWithBadge.propTypes = {
id: PropTypes.string.isRequired,
count: PropTypes.number.isRequired,
issueBadge: PropTypes.bool,
className: PropTypes.string,
};
export default IconWithBadge;