lib/TaskQueue.js

class TaskQueue {
  constructor () {
    this._chain = Promise.resolve()
  }

  /**
   * @param {Function} task
   * @return {Promise}
   */
  postTask (task) {
    const result = this._chain.then(task)
    this._chain = result.catch(() => {})
    return result
  }
}

/**
 * @type {TaskQueue}
 */
module.exports = TaskQueue