How to generate all compiled code in a single folder?

to be honest, things should just work out of the box, including the caching, but if it does not, there’s no way anyone will invest any time trying to fix bugs in a version of the compiler that was released years ago. My first recommendation would be to upgrade. You can just convert the reason syntax to rescript with bsc, then the upgrade should be really straightforward as long as you keep uncurried to false. You’ll then have some time to convert to uncurried until v12 is released.