private
    val openJars = mutableMapOf<File, JarFile>()

    private
    val classBytesIndex = (relevantClassPathFiles + classPathDependencies + platformClassLoader).map { classBytesIndexFor(it) }

    /**
     * Class file bytes for Kotlin source name, if found.
     */
    fun classBytesFor(sourceName: String): ByteArray? =
        classBytesSupplierForSourceName(sourceName)?.let { it() }