Custom error pages dynamic content

We would like to use router.catch() feature, also sending error report to sentry, when user hits error page. Ideally reusing next _error page that we already have. Since proxy() is disallowed, and other methods does not seem to work inside catch(render/compute/renderWithApp), I can’t find a way to include js bundle to the custom error page. Is there anything we can do to implement this?

You should build a fully static error page and render it using serveStatic.

What do you mean by this?