mastodon/app/javascript/mastodon/components/autosuggest_hashtag.js

import React from 'react';
import PropTypes from 'prop-types';
import { shortNumberFormat } from 'mastodon/utils/numbers';
import { FormattedMessage } from 'react-intl';

export default class AutosuggestHashtag extends React.PureComponent {

  static propTypes = {
    tag: PropTypes.shape({
      name: PropTypes.string.isRequired,
      url: PropTypes.string,
      history: PropTypes.array,
    }).isRequired,
  };

  render () {
    const { tag } = this.props;
    const weeklyUses = tag.history && shortNumberFormat(tag.history.reduce((total, day) => total + (day.uses * 1), 0));

    return (
      <div className='autosuggest-hashtag'>
        <div className='autosuggest-hashtag__name'>#<strong>{tag.name}</strong></div>
        {tag.history !== undefined && <div className='autosuggest-hashtag__uses'><FormattedMessage id='autosuggest_hashtag.per_week' defaultMessage='{count} per week' values={{ count: weeklyUses }} /></div>}
      </div>
    );
  }

}