$XDG_CONFIG_HOME defines the base directory relative to which user specific configuration files should be stored. If $XDG_CONFIG_HOME is either not set or empty, a default equal to $HOME/.config should be used.
Previously, if $XDG_CONFIG_HOME was not set, the config path defaulted to $HOME/.config/configstore. However, if $XDG_CONFIG_HOME was set to a valid value like $HOME/.config the path would have expanded to $HOME/.config/.config/configstore.
sindresorhus
commented
11 years ago
From the XDG Base Dir Spec:
Previously, if $XDG_CONFIG_HOME was not set, the config path defaulted to
$HOME/.config/configstore. However, if $XDG_CONFIG_HOME was set to a valid value like$HOME/.configthe path would have expanded to$HOME/.config/.config/configstore.