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):

#dateTimePromise = null;
  #boundKeyDown = this.#keyDown.bind(this);
  #boundHide = this.#hide.bind(this);
  #boundShow = this.#show.bind(this);
  #boundToggle = this.#toggle.bind(this);
  #color = null;
  #container = null;
  #contentsObj = null;
  #elements = null;
  #parent = null;
  #parentRect = null;
  #pinned = false;
  #popup = null;
  #rect = null;
  #richText = null;
  #titleObj = null;
  #wasVisible = false;
  constructor({
    container,
    color,
    elements,
    titleObj,
    modificationDate,
    contentsObj,
    richText,
    parent,
    rect,