In the following spots a "MouseUp" eventName is being used, which does look inconsistent considering that the "Mouse Down"/"Mouse Enter"/"Mouse Exit" eventNames all have a space in them.
Is this inconsistency actually expected, or is it a simple typo? If the former, then a comment explaining *why* would be appropriate; otherwise we should just fix this :-)

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L806

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L945

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L1034

 - https://github.com/mozilla/pdf.js/blob/25b84ce84c95ba06d1ee57e578672048269c39c1/src/display/annotation_layer.js#L1168

/cc @calixteman 
if (!this._calculationOrder) {
      return;
    }
    const first = this._calculationOrder[0];
    const source = this._objects[first];
    globalThis.event = new Event({});
    this.runCalculate(source, globalThis.event);
  }
  runCalculate(source, event) {
    if (!this._calculationOrder) {
      return;
    }
    for (const targetId of this._calculationOrder) {
      if (!(targetId in this._objects)) {
        continue;
      }
      const target = this._objects[targetId];
      this.runActions(source, target, event, "Calculate");
      this.runActions(target, target, event, "Validate");
      if (!event.rc) {
        continue;
      }
      target.wrapped.value = event.value;
      this.runActions(target, target, event, "Format");
      target.wrapped.valueAsString = event.value;
    }
  }
}
export { Event, EventDispatcher };