Raven JS: Steps to ignore certain browsers

I would like to ignore all errors generated where browser starts with Yandex. Should that be done inside the shouldSendCallback function, and if so then should I search using fields inside the provided data, or should I search the user agent string directly using browser API?

I found the answer to this in a GitHub Issue so will link and answer here myself:

From https://github.com/getsentry/raven-js/issues/617#issuecomment-227562203

The answer is indeed to use the shouldSendCallback function, with this being an example to ignore Cloudflare and early IE browsers:

Raven.config('https://xyz@app.getsentry.com/12345', {
  shouldSendCallback(data) {
    return !/^(.*CloudFlare-AlwaysOnline.*|.+MSIE 8\.0;.+)$/.test(window.navigator.userAgent);
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While we are absolutely +1 on doing this on the client (to save CPU on the server), current versions of Sentry (including sentry.io) do have a filter for removing issues caused by bots.

In my project, “Filter out known web crawlers” was set to enabled, however I still saw Yandex pop up as the browser for a weird error, so that’s why I’m ignoring them manually.

Correction: It’s actually “Yandex Browser”, i.e not the same thing as the crawler. So I wouldn’t consider it a “bot” and therefore only way to address this is the shouldSendCallback function, as I don’t wish to “support” it as a browser if it’s going to throw errors.