I was trying to create an item to use and It didn't allow me to Import:
import mods.contenttweaker.Item;

then comes up with this error:
Vanilla\CustomItem.zs:9 > No such member: Item
Vanilla\CustomItem.zs:9 > Not a valid type

https://pastebin.com/LPW3ydz2

Fixed in Dev builds, should have a curse release this weekend