i am trying to use pdfkit to create a ticket for pos printer with a paper width of 80mm. The problem is that the height is variable and not set (like in html). Can this be done or i am thinking wrongly?

const doc = new PDF({
                size: [80, "auto"??] // See other page sizes here: https://github.com/devongovett/pdfkit/blob/d95b826475dd325fb29ef007a9c1bf7a527e9808/lib/page.coffee#L69
                info: {
                    Title:  "blabla",
                    Author: "moi"
                }, margins: {
                    top: 10,
                    bottom: 10,
                    left: 10,
                    right: 10
                });

i do not find a way to do this in the documentation. Any suggestions? Thank you.

EDIT: I found this Epson ePOS SDK for JavaScript that i am going to test it.