zigbee2mqtt/lib/util/data.js

const path = require('path');

let dataPath = null;

if (process.env.ZIGBEE2MQTT_DATA) {
    dataPath = process.env.ZIGBEE2MQTT_DATA;
}
else {
    dataPath = path.join(__dirname, '..', '..', 'data');
    dataPath = path.normalize(dataPath);
}

module.exports = {
    joinPath: (file) => path.join(dataPath, file)
}