Hello!

Let me know if i should have opened this issue on the [pdfjs-dist](https://github.com/mozilla/pdfjs-dist) repo but I though here would fit.

I'm using pdfjs-dist and I'm in need of some more types to be exported. I have no idea how the types end up in the dist-repo but would love to open a PR if only someone could point me in the right direction 😃 Since I was using an older version of pdfjs-dist I realize the only type I need that's not in the type defs in the latest release are _PageViewport_ from _[display/display_utils](https://github.com/mozilla/pdf.js/blob/master/src/display/display_utils.js#L153)_.
type: "button",
          
        ],
      });
      await loadingTask.destroy();
    });
    it("gets non-existent calculationOrder", async function () {
      const calculationOrder = await pdfDocument.getCalculationOrderIds();
      expect(calculationOrder).toEqual(null);
    });
    it("gets calculationOrder", async function () {
      if (isNodeJS) {
        pending("Linked test-cases are not supported in Node.js.");
      }
      const loadingTask = getDocument(buildGetDocumentParams("issue13132.pdf"));
      const pdfDoc = await loadingTask.promise;
      const calculationOrder = await pdfDoc.getCalculationOrderIds();
      expect(calculationOrder).toEqual([
        "319R",
        "320R",
        "321R",
        "322R",
        "323R",
        "324R",
        "325R",
        "326R",
        "327R",
        "328R",
        "329R",
        "330R",