Using PdfKit with pages like angular

[godomainz]

I have written below code

import pdfkit
url='https://myangularsite.com/student-registration-webform'
pdfkit.from_url(url, 'out.pdf', options = {'javascript-delay':'1000'})

without this javascript-delay':'1000 above code printing EMPTY Page. But that's unreliable. Because angular is asynchronous. Putting a static value like 1000 is not good. We don't know when the page finishes loading. Is there any way to signal pdfkit that the page is ready ? can we check this asynchronously in python ?