A package not available for import

We use KS v. 7.7.2 .

The XPathBuilder class is described here in KS API 7.9.0 https://docs.katalon.com/javadoc/com/kms/katalon/core/common/XPathBuilder.html

Nevertheless, the autocomplete utility does not offer the com.kms.katalon.core.common package,
and when the code is run, it fails with the following reason:

org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
file:/C:/.../Scripts/a1_nekomitovat/Script1611663871966.groovy: 2: unable to resolve class com.kms.katalon.core.common.XPathBuilder
 @ line 2, column 1.
   import com.kms.katalon.core.common.XPathBuilder as XPathBuilder

Maybe it is a new package. Is there the KS API 7.7.2 specification available somewhere?