If ${XDG_CONFIG_HOME:-$HOME/.config}/user-dirs.dirs does not exist, or lacks the specified key (e.g. XDG_DOWNLOAD_DIR), the behaviour of xdg-user-dir the CLI program is to output $HOME.
In the same case, the behaviour of dirs_next::download_dir() (for example) is to return None.
There's no specification as such for '"well known" user directories', but it's implied that this is the intended fall-back behaviour:
Note: To disable a directory, point it to the homedir.
If
${XDG_CONFIG_HOME:-$HOME/.config}/user-dirs.dirsdoes not exist, or lacks the specified key (e.g.XDG_DOWNLOAD_DIR), the behaviour ofxdg-user-dirthe CLI program is to output$HOME.In the same case, the behaviour of
dirs_next::download_dir()(for example) is to returnNone.There's no specification as such for '"well known" user directories', but it's implied that this is the intended fall-back behaviour:
https://www.freedesktop.org/wiki/Software/xdg-user-dirs/
cf. tauri-apps/tauri#3090