https://github.com/mozilla/pdf.js/blob/0df1a5661958df0c4ed2f73b0f3266d825c5c280/src/display/api.js#L710-L719
The return type signature `@returns {Promise<{num: number, gen: number}>}` is mismatched with its definition. (should be `@returns {Promise<number>}`)
this._stats.time("Overall");
    }
    const renderingIntent = intent === "print" ? "print" : "display";
    
    
    this.pendingCleanup = false;
    if (!optionalContentConfigPromise) {
      optionalContentConfigPromise = this._transport.getOptionalContentConfig();
    }
    let intentState = this._intentStates.get(renderingIntent);
    if (!intentState) {
      intentState = Object.create(null);
      this._intentStates.set(renderingIntent, intentState);
    }
    
    if (intentState.streamReaderCancelTimeout) {
      clearTimeout(intentState.streamReaderCancelTimeout);
      intentState.streamReaderCancelTimeout = null;
    }
    const canvasFactoryInstance =
      canvasFactory ||
      new DefaultCanvasFactory({ ownerDocument: this._ownerDocument });
    const annotationStorage = includeAnnotationStorage
      ? this._transport.annotationStorage.serializable
      : null;
    
    
    if (!intentState.displayReadyCapability) {
      intentState.displayReadyCapability = createPromiseCapability();
      intentState.operatorList = {