**Are you using the latest version of jsPDF?** jsPDF 1.4.1 **Have you tried using jspdf.debug.js?** Yes **Steps to reproduce** Create a new jsPDF instance and try to access internal.pageSize.width/height. They are undefined/NaN. Example: [jsbin](http://jsbin.com/puniraq/2/edit?html,js,output) **What I saw** pageSize.width & pageSize.height are undefined **What I expected** pageSize.width & pageSize.height should contains the actual page values. **Note:** - Using pageSize.getWidth()/pageSize.getHeight()works, but Typescript will marks it as an error and prevent angular 2+ from compile correctly. [Example](http://jsbin.com/wewivuf/1/edit?html,js,output) - In 1.3.5 all works correctly