What is the type for an .orderBy() parameter

Inside of a function, i have a query more complicated than this, but something like:

db.select().from(users).where(...).orderBy(asc(users.username))

db.select().from(users).where(...).orderBy(asc(users.username))

db.select().from(users).where(...).orderBy(asc(users.username))

db.select().from(users).where(...).orderBy(asc(users.username))

I'd like to be able to pass in the

asc(users.username)

asc(users.username)

asc(users.username)

asc(users.username)

part of that from the outside., but to do that I need to know what type i should be putting on the function parameter.