They use the 'directories' crate (https://docs.rs/directories/3.0.1/directories/struct.ProjectDirs.html#examples https://docs.rs/directories/3.0.1/directories/s

They use the 'directories' crate (https://docs.rs/directories/3.0.1/directories/struct.ProjectDirs.html#examples https://docs.rs/directories/3.0.1/directories/struct.Project...) to work out where the data directory should be, then write out to a json file. See 'src/utils.rs'