KotlinScriptType.INIT, KotlinScriptType.SETTINGS -> emptyList()
            else -> buildSrcRootsOf(projectDir)
        }

        return gradleKotlinDslJar + projectBuildSrcRoots + gradleSourceRoots
    }

    /**
     * Returns source directories from buildSrc if any.
     */
    fun buildSrcRootsOf(projectRoot: File): Collection<File> =
        projectRoot.resolve("buildSrc/$buildSrcSourceRootsFilePath")

    val scriptClassPath: ClassPath by unsafeLazy {
        rootProject.gradle.baseScriptClassPath()
    }

    private
    val buildSrcSources: Collection<File> by unsafeLazy {
        SourcePathProvider.buildSrcRootsOf(rootProject.rootDir)
    }

    private
    val gradleSourceRoots: Collection<File> by unsafeLazy {
        rootProject.gradleSourceRoots()
    }