code: function setBlocking (blocking) {
    [process.stdout, process.stderr].forEach(stream => {
      /* istanbul ignore else */
      if (stream._handle && typeof stream._handle.setBlocking === 'function') {
        stream._handle.setBlocking(blocking)
      }
    })
  }
docs: 强制 stdio 同步输出
  https://github.com/nodejs/node/issues/6456
  
  @param {boolean} blocking 是否同步
  @returns {void}