puyopuyotetr.is/app/javascript/mastodon/features/notifications/components/setting_toggle.js

import React from 'react';
import PropTypes from 'prop-types';
import ImmutablePropTypes from 'react-immutable-proptypes';
import Toggle from 'react-toggle';

class SettingToggle extends React.PureComponent {

  static propTypes = {
    settings: ImmutablePropTypes.map.isRequired,
    settingKey: PropTypes.array.isRequired,
    label: PropTypes.node.isRequired,
    onChange: PropTypes.func.isRequired,
    htmlFor: PropTypes.string,
  }

  onChange = (e) => {
    this.props.onChange(this.props.settingKey, e.target.checked);
  }

  render () {
    const { settings, settingKey, label, onChange, htmlFor = '' } = this.props;

    return (
      <label htmlFor={htmlFor} className='setting-toggle__label'>
        <Toggle checked={settings.getIn(settingKey)} onChange={this.onChange} />
        <span className='setting-toggle'>{label}</span>
      </label>
    );
  }

}

export default SettingToggle;