Does Sorbet add signatures for standard lib?

Question

I would want Sorbet to raise a warning when code like this is written:

list = list.sort!

As I would expect Array#sort! to be of type void

user_537862 · Answer

Yes, Sorbet does include types for standard library of Ruby. For example, here's the type annotation for sort! https://github.com/sorbet/sorbet/blob/119e937e9e3b03ec27308cd8874f482791d15864/rbi/core/array.rbi#L670-L677

Note that in Ruby sort! does return a value and Sorbet correctly models that.