How to send Winkeys in node.js

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Node.js

Hi,

My name is Abhi.Am running my protractor tests using node.js platform. i have a scenario where i have to save a pdf from the browser. I can do it with auto-it ,our client is not permitting to do it. Please suggest me to enter (CTRL+SHIFT+S)using node.js. I have used npm pdf modules to do it. But the link has no .pdf extension, i can only download by using (CTRL+SHIFT+S).

Please anyone suggest me the proper link or code to send WinKeyStrokes using nodejs. Am sorry for my bad english.

Thanks in advance,
Abhi.