code: async function execTasks(tasks, taskType) {
    debug(`execTasks: called for ${taskType}`);
    if (!(_.isEmpty(tasks))) {
      if (taskType) console.log(`running ${taskType}...`);
      const output = await Promise.mapSeries(tasks, async(task) => {
        const result = await execTask(task);
        if (_.isString(result.stdout) && (!_.isEmpty(result.stdout)))
          console.log(result.stdout.trim());
        if (_.isString(result.stderr) && (!_.isEmpty(result.stderr)))
          console.log(result.stderr.trim());
        return result;
      });
      return output;
    }
    debug("execTasks: nothing to do; resolving");
    return;
  }
docs: exec list of tasks, print stdout and stderr for each