HI ,
I want to use scratch in my ionic 2 app. link http://www.cssscript.com/touch-friendly-scratch-card-pure-javascript-scratchcard/ . I tried to put js file in assets/js folder but no luck .
NO response in forum
Well, probably nobody ever used this before.
In general: https://ionicframework.com/docs/developer-resources/third-party-libs/
Thanks . What i will write name npm install --save
No idea if this library even exists on npm.
How i can check this ? any idea 
For Ionic 4 Check out this tutorial 
