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
if (this._indeterminate) {
      this.div.classList.add("indeterminate");
      this.div.style.width = this.width + this.units;
      return;
    }
    this.div.classList.remove("indeterminate");
    const progressSize = (this.width * this._percent) / 100;
    this.div.style.width = progressSize + this.units;
  }
  get percent() {
    return this._percent;
  }
  set percent(val) {
    this._indeterminate = isNaN(val);
    this._percent = clamp(val, 0, 100);
    this._updateBar();
  }
  setWidth(viewer) {