How to know if PDF.JS has finished rendering?

Question

I am using PDF.JS to render pdf pages into different canvas elements. my requirement is to capture the output of the canvas and to display it as an image. Is there some even

Answer 1

window.addEventListener('load', function () {
    PDFViewerApplication.eventBus.on('textlayerrendered', function () {
      console.log('textlayerrendered', arguments, PDFViewerApplication)
    })

Event name textlayerrendered includes of PDFViewerApplication.eventBus._listeners