Having the same issue.
This is the code I am running… and it does not work.
import wixUsers from 'wix-users';
export function KickOffDataCollection_beforeInsert(item, context) {
let hookContext = context;
let user = wixUsers.currentUser;
let userId = user.id;
item.userID = userId;
console.log("userid = "+userId);
return item;
}