message: Set fontExtraProperties: true.
  See
diff: @@ -36,6 +36,7 @@ async function renderToSvg(pdfPath: string, options: { height: number, width: nu
  const data = new Uint8Array(fs.readFileSync(pdfPath))
  const loadingTask = pdfjsLib.getDocument({
  data,
  + fontExtraProperties: true,
  nativeImageDecoderSupport: 'display',
  CMapReaderFactory: NodeCMapReaderFactory
  })
  