pdfMake not working in Ionic

Ionic Framework ionic-v3
1

Problem is that pdfMake function is not doing anything
It is neither giving me success nor giving me error. I don’t know where I am wrong.
Please guide me I am new to Ionic 2

First I installed “npm install pdfmake --save”

Secondly I defined the libraries in the body of index.html file like this

<script src="build/main.js"></script>
 <script src='/pdfmake.min.js'></script>

Thirdly I imported libraries like this

 var pdfMake = require('pdfmake/build/pdfmake.js');
 var pdfFonts = require('pdfmake/build/vfs_fonts.js');
 pdfMake.vfs = pdfFonts.pdfMake.vfs;

In the last I am accessing the the pdfmake function like this.

var docDefinition = 
     {
     compress: false, 
     pageSize: 'A4',
     content: ['This is an sample PDF printed with pdfMake']};

pdfMake.createPdf(docDefinition).open()

Consoling both libraries to check whether they are included or not.

image
image.PNG715×42 2.43 KB

and console tells that they are included.

Button is consoling these both libraries but not performing the open function command