Can a userscript be detected with window.onerror?

[SmileB4Deathz]

If a webpage catches errors with window.onerror and sends the error to their servers, will a tampermonkey script error also be detected with this method?

[derjanb]

In general yes. Exceptions are JavaScript and DOM @sandbox modes in Firefox and DOM mode in Chrome (if enabled).

// @sandbox      JavaScript

https://tmnk.net/docs#meta:sandbox