metamask-extension/ui/app/components/pages/confirm-add-token/token-balance/token-balance.component.js

import React, { Component } from 'react'
import PropTypes from 'prop-types'

export default class TokenBalance extends Component {
  static propTypes = {
    string: PropTypes.string,
    symbol: PropTypes.string,
    error: PropTypes.string,
  }

  render () {
    return (
      <div className="hide-text-overflow">{ this.props.string }</div>
    )
  }
}