How do you load a js library for widgets?

[mdjoseph12]

Trying to import a js library to use with a widget on the service portal, what is the best way to import the library and reference it within the html. I've tried "<script src=.." but it doesn't seem to work 

[Dylan Mann1]

Are you getting any errors in the console?

[mdjoseph12]

well it appears that its stopping at "Initialization finished. Ready to start", which makes me assume that it's not able to access the quagga functions from the dependency 

[Dylan Mann1]

Right, I would thing you need to instantiate your Quagga class at some point before using it. Try replacing the line where you set your const, but use var:

var Quagga = require('quagga').default;

Log what that returns and see if that helps.

P.S. There's a barcode widget that comes OOB that you may be able to reference, it's called "Barcode"

[mdjoseph12]

Makes sense, and I attempted to use that widget but it didnt seem to work on the service portal. 

This is the error that I am recieving after adding that line: 

Uncaught ReferenceError: require is not defined
at HTMLInputElement.eval (eval at globalEval (js_includes_sp_libs.jsx?v=12-03-2019_1915&lp=Tue_Jan_21_06_25_19_PST_2020&c=35_683:185), <anonymous>:97:22)

[mdjoseph12]

seems like require() does not exist in the browser/client-side JavaScript