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I guess if you create a small plugin class that does not use 1.4 features, it should work. Have you tried it? In other words,

IntelliJPluginGradleChecker.kt

:

class IntelliJPluginGradleChecker : Plugin<Project> {
    override fun apply(project: Project) {
        checkGradleVersion()
        apply(plugin = "..intellij..")
    }
}

This is indeed a neat idea. With 2.0 I plan to refactor the structure of the whole plugin and introduce sub-plugins. That’ll be a good time to extract such a checker that way. Thanks!