Some parameters are missing for the declaration of functions.
Same issues for files below.
OK, but a better type will be available with T1076.
No whiteline is needed between params and return value.
Not needed whiteline.
Let's also define return types.
Per discussion on Whatsapp, Dorian intends to add return types in a second commit.
(not that we should discuss open source software development in a private system like WhatsApp, but we were discussing there when the issue was raised)