I was caught by surprise today, when I realized that Scriptler scripts do not seem to support import statements. In fact they completely ignore them, not even raising an error when you try to import a totally bogus package. 

As an example, I tried to use the hudson.util Util (Jenkins core 2.330 API)] package and its Util.rawEncode() method.

Note that the script itself works correctly from the Jenkins script console

In Scriptler script, I added an import statement for the Util package, and later tried to call it from the static class:

import hudson.util.*
Util.rawEncode('/path to encode/for Artifact#34')

It failed with the error message

groovy.lang.MissingPropertyException: No such property: Util for class: Script1