Method ref

lib/document.js:250–255

(data)

  }

  ref(data) {
    const ref = new PDFReference(this, this._offsets.length + 1, data);
    this._offsets.push(null); // placeholder for this object's offset once it is finalized
    this._waiting++;
    return ref;
  }

  _read() {}
  // do nothing, but this method is required by node