rsnext/examples/with-sentry/pages/_app.js

import App from 'next/app'
import sentry from '../utils/sentry'

const { Sentry, captureException } = sentry()

export default class MyApp extends App {
  constructor () {
    super(...arguments)
    this.state = {
      hasError: false,
      errorEventId: undefined
    }
  }

  static async getInitialProps ({ Component, ctx }) {
    try {
      let pageProps = {}

      if (Component.getInitialProps) {
        pageProps = await Component.getInitialProps(ctx)
      }

      return { pageProps }
    } catch (error) {
      // Capture errors that happen during a page's getInitialProps.
      // This will work on both client and server sides.
      const errorEventId = captureException(error, ctx)
      return {
        hasError: true,
        errorEventId
      }
    }
  }

  static getDerivedStateFromProps (props, state) {
    // If there was an error generated within getInitialProps, and we haven't
    // yet seen an error, we add it to this.state here
    return {
      hasError: props.hasError || state.hasError || false,
      errorEventId: props.errorEventId || state.errorEventId || undefined
    }
  }

  static getDerivedStateFromError () {
    // React Error Boundary here allows us to set state flagging the error (and
    // later render a fallback UI).
    return { hasError: true }
  }

  componentDidCatch (error, errorInfo) {
    const errorEventId = captureException(error, { errorInfo })

    // Store the event id at this point as we don't have access to it within
    // `getDerivedStateFromError`.
    this.setState({ errorEventId })
  }

  render () {
    return this.state.hasError ? (
      <section>
        <h1>There was an error!</h1>
        <p>
          <a
            href='#'
            onClick={() =>
              Sentry.showReportDialog({ eventId: this.state.errorEventId })
            }
          >
            📣 Report this error
          </a>
        </p>
        <p>
          <a
            href='#'
            onClick={() => {
              window.location.reload(true)
            }}
          >
            Or, try reloading the page
          </a>
        </p>
      </section>
    ) : (
      // Render the normal Next.js page
      super.render()
    )
  }
}