Ghostscript does not work, missing double quote.

[bestis]

There isn't equal amount of quotes. It doesn't work.

Fix for this is to edit pdf-officegen/lib/engine.js line 116:

-        const args = [...gsOpts, `-o "${imgPrefix}%d.png`, pdfPath]
+        const args = [...gsOpts, `-o "${imgPrefix}%d.png"`, pdfPath]

[bestis]

So if you are getting error:

Unhandled rejection (<Error: Command failed: gs -q -dQUIET -...>, no stack trace)

That's most likely the reason.