import React from 'react'; import { FormattedMessage } from 'react-intl'; import PropTypes from 'prop-types'; class ColumnBackButton extends React.PureComponent { static contextTypes = { router: PropTypes.object }; handleClick = () => { if (window.history && window.history.length === 1) this.context.router.push("/"); else this.context.router.goBack(); } render () { return (