Pop OS with a deduplication filesystem

I'm moving a friend development machine to Linux (PopOS), permanently. Don't worry guys, he dualbooted and he's ready for the tux. The problem is his drive. It's a 256GB SSD, and he is moving from a rusty 512GB HDD almost full of projects, where a most of the space used is from vendor shared libraries (npm hell, composer, to name a few). Since package managers would download a library, and then copy it over the project, I think it would be convenient for a filesystem that deals with deduplication. I'm trying to check if there is a filesystem to deduplicate files on Linux, as [Microsoft "Dev Drive"](https://learn.microsoft.com/en-us/windows/dev-drive/) that can work (hopefully, but not required) as a boot drive too.