promisify process in node.js

    const {exec} = require('child_process');

    function spawn(...args) {
      return new Promise(function (resolve, reject) {
        const process = exec(`java -jar gp.jar --delete D27600008501 --key ${lockKey}`, function (err, stdout, stderr) {
          if (err)
            return reject(err);
        });

        process.on('exit', code => resolve(code));
      });
    }