Reading from the source code:

https://github.com/mozilla/pdf.js/blob/57d196e3497e77c81c19f852715ce79d9fb91492/src/display/annotation_layer.js#L2846

it appears to me it was not an intention to mark downloadManager as a required parameter in AnnotationLayerParameters:

https://github.com/mozilla/pdf.js/blob/57d196e3497e77c81c19f852715ce79d9fb91492/src/display/annotation_layer.js#L63

and AnnotationLayerBuilderOptions:

https://github.com/mozilla/pdf.js/blob/57d196e3497e77c81c19f852715ce79d9fb91492/web/annotation_layer_builder.js#L40

and it should be optional, similarly to accessibilityManager for example:

https://github.com/mozilla/pdf.js/blob/57d196e3497e77c81c19f852715ce79d9fb91492/web/text_layer_builder.js#L30

**Configuration:**
- PDF.js version: 2.11.174
- Is a browser extension: no

**What is the expected behavior? (add screenshot)**

`downloadManager` to be optional

**What went wrong? (add screenshot)**

`downloadManager` marked as required

Link to a viewer (if hosted on a site other than mozilla.github.io/pdf.js or as Firefox/Chrome extension):

for (const element of elements) {
      element.container?.addEventListener("keydown", this.#boundKeyDown);
    }
    this.#container.hidden = true;
    if (open) {
      this.#toggle();
    }
    if (typeof PDFJSDev !== "undefined" && PDFJSDev.test("TESTING")) {
      
      
      this.#parent.popupShow.push(async () => {
        if (this.#container.hidden) {
          this.#show();
        }
        if (this.#dateTimePromise) {
          await this.#dateTimePromise;
        }
      });
    }
  }
  render() {
    if (this.#popup) {
      return;
    }
    const {
      page: { view },
      viewport: {
        rawDims: { pageWidth, pageHeight, pageX, pageY },
      },