SVGGraphics.getSVG has wrong return type in 3.8.162

[wojtekmaj]

Before #16543, TypeScript type for SVGGraphics was any. Now, it returns correct types. Congrats!

But, I believe there is a small mistake.

SVGGraphics.getSVG has type of (operatorList: PDFOperatorList, viewport: PageViewport) => Promise<void>, which I believe is not accurate representation of what this method does. I think it's supposed to be (operatorList: PDFOperatorList, viewport: PageViewport) => Promise<SVGElement>.

[Snuffleupagus]

First of all, please note that the SVG back-end is deprecated and thus should not be used. It may also be completely removed soon, see PR #16699, hence it's not clear to me that it makes much sense to try and fix this unfortunately.

Secondly, unless a TypeScript user steps up and helps out, the type-definitions are possibly going to be broken in the next PDF.js release; please see issue #16705 for additional details.