const panelView = elementor?.getPanelView();
const currentPageView = panelView?.currentPageView;

if (panelView && currentPageView?.model && currentPageView?.model?.attributes?.widgetType) {
    const widgetModel = currentPageView.model;
                   
    // Getter
    widgetModel.getSetting(key);
    
    // Setter
    widgetModel.setSetting(key, value);
}

// Found another hook too for new version of Elementor.
// Fires when a widget gets active.

elementor.hooks.addAction('panel/open_editor/widget', (panel, model) => {
    // Your code here.
}