PhotoSwipe dynamically getting images sizes

user-portfolio-part.component.ts

    private openPhotoSwipe(index: number): boolean {
        const options = {
            addCaptionHTMLFn: (item, captionEl, isFake) => {
                if (!_.isString(item.title)) {
                    captionEl.children[0].innerHTML = '';
                    return false;
                }
                captionEl.children[0].innerHTML = item.title;

                if (_.isString(item.author)) {
                    captionEl.children[0].innerHTML += `<br><small>${item.author}</small>`;
                }
                return true;
            },
            preload: [1, 1],
            bgOpacity: 0.85,
            showHideOpacity: true,
            history: false,
            closeOnScroll: false,
            errorMsg: 'Ошибка при загрузке.',
            index: index
        };

        const PSWP: HTMLElement = <HTMLElement>this.ngp.LightboxElement.nativeElement;
        const photoSwipe: PhotoSwipe<PhotoSwipeUI_Default.Options> = new PhotoSwipe(PSWP, PhotoSwipeUI_Default, this.photoSwipeImages, options);

        photoSwipe.listen('imageLoadComplete', (index, item) => {
            console.log(index);
            if (item.w < 1 || item.h < 1) { // unknown size
                const img = new Image();
                img.onload = () => { // will get size after load
                    item.w = img.width; // set image width
                    item.h = img.height; // set image height
                    photoSwipe.invalidateCurrItems(); // reinit Items
                    photoSwipe.updateSize(true); // reinit Items
                };
                img.src = item.src; // let's download image
            }
        });

        photoSwipe.init();
        return false;
    }

    private _initPhotoSwipeImages(portfolio: Portfolio): void {
        this.photoSwipeImages = _.map(portfolio.images, (x, i) => {
            return {
                src: x.fileName,
                w: 0,
                h: 0,
                id: i,
                title: `${x.title} ${x.description}`,
                author: `${this.user.firstname} ${this.user.lastname}. Добавлено: ${x.createdDate}`
            };
        });
    }