Same rules as with Mill!
For example, this set of directives will work for all platforms (note the double set of ::):
//> using scala 3.3.1
//> using dep org.scodec::scodec-bits::1.1.32(allowing you to run it with --js and --native flags, or without flags at all)
Whereas this specification will only work on the JVM:
//> using scala 3.3.1
//> using dep org.scodec::scodec-bits:1.1.32