js code

je souhaite comprendre svpl comment ce constructor et cette class ont ete cree svpl

"
 export class Item {
    // DOM elements
    DOM = {
        // main element (.item)
        el: null,
        // image element (.item__img)
        image: null,
        // image inner element (.item__img-inner)
        imageInner: null,
        // item link (.item__link)
        link: null,
        // item meta (.item__meta)
        meta: null,
        // item link (.item__title)
        title: null,
        // item link (.item__desc)
        desc: null,
    }

    /**
     * Constructor.
     * @param {Element} DOM_el - main element (.item)
     * @param {Preview} previewEl - the Preview element
     */
    constructor(DOM_el, previewEl) {
        this.DOM.el = DOM_el;
        this.preview = previewEl;
        this.DOM.image = this.DOM.el.querySelector('.item__img');
        this.DOM.imageInner = this.DOM.el.querySelector('.item__img-inner');
        this.DOM.link = this.DOM.el.querySelector('.item__link');
        this.DOM.meta = this.DOM.el.querySelector('.item__meta');
        this.DOM.title = this.DOM.el.querySelector('.item__title');
        this.DOM.desc = this.DOM.el.querySelector('.item__desc');

        this.DOM.link.addEventListener('mouseenter', () => {
            gsap.killTweensOf(this.DOM.imageInner);
            gsap.to(this.DOM.imageInner, {
                duration: 2,
                ease: 'power4',
                scale: 1.2
            });
        });
        this.DOM.link.addEventListener('mouseleave', () => {
            gsap.killTweensOf(this.DOM.imageInner);
            gsap.to(this.DOM.imageInner, {
                duration: 0.7,
                ease: 'expo',
                scale: 1
            });
        });
    }
}
"

Ce que je veux

comprendre comment la class a ete cree et son constructor
Ce que j'obtiens

Décrivez vos éventuelles erreurs ou ce que vous obtenez à la place de ce que vous attendez :(