How to use the @webiny/app-page-builder/editor/selectors.getContent function in @webiny/app-page-builder

const stateToProps = state => ({
    rootElement: state.elements[getContent(state).id],
    layout: get(getPage(state), "settings.general.layout"),
    renderLayout: isPluginActive("pb-editor-toolbar-preview")(state)
});

    state => ({ count: getContent(state).elements.length }),
    { togglePlugin }

    state => ({ content: getContent(state) }),
    {