All Implemented Interfaces and Traits:

Condition

public class OnGrailsEnvCondition
extends java.lang.Object
implements Condition

Matches when the current Grails environment is one of those named by grails.compiler.beans.ConditionalOnGrailsEnv.

The environment comes from grails.util.Environment.getCurrent(), which is the only answer that accounts for Grails inferring an environment nobody set. That class lives in a module this one is a dependency of, so it is reached reflectively rather than by import; where it is absent the grails.env property is consulted instead, which covers the case the property was designed for - an explicitly set environment - and leaves the condition unmatched otherwise rather than guessing.