index.js

import os from 'os';
import path from 'path';

const homeDirectory = os.homedir();
const {env} = process;

export const xdgData = env.XDG_DATA_HOME ||
	(homeDirectory ? path.join(homeDirectory, '.local', 'share') : undefined);

export const xdgConfig = env.XDG_CONFIG_HOME ||
	(homeDirectory ? path.join(homeDirectory, '.config') : undefined);

export const xdgState = env.XDG_STATE_HOME ||
	(homeDirectory ? path.join(homeDirectory, '.local', 'state') : undefined);

export const xdgCache = env.XDG_CACHE_HOME || (homeDirectory ? path.join(homeDirectory, '.cache') : undefined);

export const xdgRuntime = env.XDG_RUNTIME_DIR || undefined;

export const xdgDataDirectories = (env.XDG_DATA_DIRS || '/usr/local/share/:/usr/share/').split(':');

if (xdgData) {
	xdgDataDirectories.unshift(xdgData);
}

export const xdgConfigDirectories = (env.XDG_CONFIG_DIRS || '/etc/xdg').split(':');

if (xdgConfig) {
	xdgConfigDirectories.unshift(xdgConfig);
}