The one big problem Renovate brings is when it automerges and breaks everything with e.g. a TypeScript upgrade. It's simple enough to handle and prevent but has required quite a lot of developer education for those who are not particularly frontend-focused in my experience.

Interesting, so you've enabled Renovate's automerge functionality for dependencies?

Renovate uses signals like your CI to work out whether things break before an automerge occurs - does that mean your CI didn't catch the breakage? Or something I've missed?

(there's also the "merge confidence" that can help here)

(I'm soon to be working at Mend on Renovate full time)