While using pdfjs in frameworks with SSR like Next.js or Gatsby there is an error while build phase
```ReferenceError: window is not defined```

The error occurs at line 563 in `ui_utils.js`

Looks like all changes needs is:
```diff
const animationStarted = new Promise(function (resolve) {
  if (
    typeof PDFJSDev !== "undefined" &&
-   PDFJSDev.test("LIB && TESTING") &&
+   PDFJSDev.test("LIB && TESTING") ||
    typeof window === "undefined"
  ) {
    // Prevent "ReferenceError: window is not defined" errors when running the
    // unit-tests in Node.js/Travis.
    setTimeout(resolve, 20);
    return;
  }
  window.requestAnimationFrame(resolve);
});
```

There is an issue in react-pdf: https://github.com/wojtekmaj/react-pdf/issues/657
scrollEl,
  views,
  sortByVisibility = false,
  horizontal = false,
  rtl = false,
}) {
  const top = scrollEl.scrollTop,
    bottom = top + scrollEl.clientHeight;
  const left = scrollEl.scrollLeft,
    right = left + scrollEl.clientWidth;
  
  
  
  
  
  
  
  
  
  
  function isElementBottomAfterViewTop(view) {