FunctionProcessor.kt

fun visitPropertyDeclaration(...) { ... }

private fun visitTypeArguments(typeArguments: List<KSTypeArgument>) {
    if (typeArguments.isNotEmpty()) {
        file += "<"
        typeArguments.forEachIndexed { i, arg ->
            visitTypeArgument(arg, data = Unit)
            if (i < typeArguments.lastIndex) file += ", "
        }
        file += ">"
    }
}

fun visitTypeArgument(typeArgument: KSTypeArgument, ...) { ... }