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):

this.#setInternalLink();
    if (!this._fieldObjects) {
      warn(
        `_bindResetFormAction - "resetForm" action not supported, ` +
          "ensure that the `fieldObjects` parameter is provided."
      );
      if (!otherClickAction) {
        link.onclick = () => false;
      }
      return;
    }
    link.onclick = () => {
      otherClickAction?.();
      const {
        fields: resetFormFields,
        refs: resetFormRefs,
        include,
      } = resetForm;
      const allFields = [];
      if (resetFormFields.length !== 0 || resetFormRefs.length !== 0) {
        const fieldIds = new Set(resetFormRefs);
        for (const fieldName of resetFormFields) {
          const fields = this._fieldObjects[fieldName] || [];
          for (const { id } of fields) {
            fieldIds.add(id);
          }
        }
        for (const fields of Object.values(this._fieldObjects)) {
          for (const field of fields) {
            if (fieldIds.has(field.id) === include) {