Ugh, this is https://github.com/gradle/gradle/issues/15383 But from what I'm reading there (this is @Vampire’s workaround), this appears to work for me: 1. In

buildSrc/build.gradle.kts

, add this to the

dependencies

block:

implementation(files(libs.javaClass.superclass.protectionDomain.codeSource.location))

2. In the conventions plugin, add these lines:

import org.gradle.accessors.dm.LibrariesForLibs

,

val libs = the<LibrariesForLibs>()

3. In the conventions plugin, you can now reference, e.g., JUnit Jupiter via

libs.junit.jupiter

. While this wasn't my original use case, it seems like you can (mostly) get it working for plugins, too: 1. In

buildSrc/build.gradle.kts

, use

libs

for any plugin

dependencies

(e.g.,

implementation(libs.plugin.spotless)

). 2. In the conventions plugin, refer to the plugin by its

id()

--not via an

alias()

(e.g.,

id("com.diffplug.spotless")

). Honestly, that's good enough for me;

id()

vs

alias()

has no bearing on the version that's actually used.