Accessing annotationStorage and other pdf.js properties

[noahw3]

I've been using react-pdf for a bit and at this point I need to interact with the underlying PDF annotations (to do things like adjust background colors, write values, etc.). As far as I can tell, the intended hook into the pdf.js library is via the Document onLoadSuccess callback - this returns the PDFDocumentProxy object, which I believe should be equal to PDFViewerApplication.pdfDocument if using pdf.js directly.

Is this accurate? Or are there other ways to access the underlying library functionalities?

Secondly, the immediate issue that I'm running into is that annotationStorage in this callback is always empty. However, if I load pages individually and get their annotations (or use the onGetAnnotationsSuccess callback), I'm presented with the annotation data properties correctly. It's unclear to me if I'm doing something incorrectly (do I need to refresh the annotation storage somehow?), or if this is the intended functionality.

While I can mutate the annotation data directly, it seems cleaner if I could access it through annotationStorage and use its helper methods.

[Distrect]

Do you know how to access modify and render annotations in reacts