fun classBytesFor(sourceName: String): ByteArray? =
        classBytesSupplierForSourceName(sourceName)?.let { it() }

    /**
     * All found class files bytes by Kotlin source name.
     */
    fun allClassesBytesBySourceName(): Sequence<Pair<String, ClassBytesSupplier>> =
        relevantClassPathFiles.asSequence()
            .flatMap { sourceNamesFrom(it) }
            .mapNotNull { sourceName ->

            repository.classBytesFor(sourceName)?.let { apiTypeFor(sourceName) { it } }
        }?.invoke()
    }

    internal
    fun allTypes(): Sequence<ApiType> = open {
        repository.allClassesBytesBySourceName().map { (sourceName, classBytes) ->
            apiTypesBySourceName.computeIfAbsent(sourceName) {
                apiTypeFor(sourceName, classBytes)
            }!!
        }.map { it() }
    }