message: Using IS_PLATFORM_IOS in PanelHeader component
diff: @@ -4,9 +4,7 @@ import PropTypes from 'prop-types';
  import getClassName from '../../helpers/getClassName';
  import classNames from '../../lib/classNames';
  -import { platform, IOS } from '../../lib/platform';
  -
  -const osname = platform();
  +import { IS_PLATFORM_IOS } from '../../lib/platform';
  export const baseClassNames = getClassName('PanelHeader');
  @@ -77,7 +75,7 @@ export default class PanelHeader extends React.Component {
  [`PanelHeader-left-in--${theme}`]: true,
  'PanelHeader-left-in--tp': transparent
  })}>{left}</div>, this.leftNode),
  - osname === IOS && ReactDOM.createPortal(<div className={classNames('PanelHeader-addon', {
  + IS_PLATFORM_IOS && ReactDOM.createPortal(<div className={classNames('PanelHeader-addon', {
  [`PanelHeader-addon--${theme}`]: true,
  'PanelHeader-addon--tp': transparent
  })}>{addon}</div>, this.addonNode),
  