metamask-extension/ui/app/pages/error/error.component.js

import React, { PureComponent } from 'react'
import PropTypes from 'prop-types'
import { getEnvironmentType } from '../../../../app/scripts/lib/util'
import { ENVIRONMENT_TYPE_POPUP } from '../../../../app/scripts/lib/enums'

class ErrorPage extends PureComponent {
  static contextTypes = {
    t: PropTypes.func.isRequired,
  }

  static propTypes = {
    error: PropTypes.object.isRequired,
  }

  renderErrorDetail (content) {
    return (
      <li>
        <p>
          {content}
        </p>
      </li>
    )
  }

  renderErrorStack (title, stack) {
    return (
      <li>
        <span>
          {title}
        </span>
        <pre className="error-page__stack">
          {stack}
        </pre>
      </li>
    )
  }

  render () {
    const { error } = this.props
    const { t } = this.context

    const isPopup = getEnvironmentType() === ENVIRONMENT_TYPE_POPUP

    return (
      <section className="error-page">
        <h1 className="error-page__header">
          {t('errorPageTitle')}
        </h1>
        <h2 className="error-page__subheader">
          {
            isPopup
              ? t('errorPagePopupMessage')
              : t('errorPageMessage')
          }
        </h2>
        <section className="error-page__details">
          <details>
            <summary>
              {t('errorDetails')}
            </summary>
            <ul>
              { error.message ? this.renderErrorDetail(t('errorMessage', [error.message])) : null }
              { error.code ? this.renderErrorDetail(t('errorCode', [error.code])) : null }
              { error.name ? this.renderErrorDetail(t('errorName', [error.name])) : null }
              { error.stack ? this.renderErrorStack(t('errorStack'), error.stack) : null }
            </ul>
          </details>
        </section>
      </section>
    )
  }
}

export default ErrorPage