Try TypeScript! It makes your JavaScript better!
That was enough for me.
shows you never worked at "big succesful companies".
The thing I am interested is that I don't suppose that Stripe always had these many LOC's and so I would be curious to know if at any point as the codebase was increasing, were they looking at other new languages which were coming like golang or rust which was more suited for their work or not and what were there decisions/thinking process to continue using ruby.
Stripe has dabbled in Golang. There is also a growing Java monorepo.
Skippy the Intern, now retired these thirty years...