Possible to upload image and other binary files?

[blurymind]

If so, how do we get this from an input onChange event to gist?
The content option seems to only accept strings, however I know that it is possible to add images to a gist in other means
https://gist.github.com/mroderick/1afdd71aa69f6b29601d335751a1a9be

btw since I am trying this from a PWA, I cannot use fs = require('fs') as its only available when running from local server