@Tarasis,
You can save CanvasJS file (canvasjs.min.js) in src folder of your project (‘src/assets/js’ or ‘src/lib’) and import the CanvasJS library to your app using import CanvasJS from 'canvasjs.min' (path may vary based on file location like ‘./src/assets/js/canvasjs.min’ or ‘./src/lib/canvasjs.min’). Or you can add it in your html file using script-tag. Please take a look at this ionic documentation on Adding 3rd Party Libraries.
Also please refer this tutorial on How to Install 3rd Party Libraries in Ionic 2 and step-by-step guide given in this github thread for more info.
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Priyanka M S
Team CanvasJS
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