Method _setup

lib/index.js:4326–4333

(options, makeData)

  }

  _setup(options, makeData) {
    super.constructor({ objectMode: true, highWaterMark: options.highWaterMark });

    // purely to keep `db` around until we're done so it's not GCed if the user doesn't keep a ref
    this._waiting = false;
    this._options = options;
    this._makeData = makeData;
  }

  setIterator(it) {
    this._iterator = it;