extensions/pdfViewer/pdf/build/pdf.worker.js
function Dict(xref) {
    // Map should only be used internally, use functions below to access.
    this.map = Object.create(null);
    this.xref = xref;
    this.objId = null;
    this.__nonSerializable__ = nonSerializable; // disable cloning of the Dict
  }
function Dict(xref) {
    // Map should only be used internally, use functions below to access.
    this.map = Object.create(null);
    this.xref = xref;
    this.objId = null;
    this.__nonSerializable__ = nonSerializable; // disable cloning of the Dict
  }
function Dict ( xref ) { // Map should only be used internally, use functions below to access. this . map = Object . create ( null ) ; this . xref = xref ; this . objId = null ; this . __nonSerializable__ = nonSerializable ; // disable cloning of the Dict }
xref is optional
xref is optional