class  {
    onCreate() {
        this.state = {
            swapped: false
        }
    }
}

<div.root key="root">
    <if(state.swapped)>
        <div data-bar="true">bar</div>
        <div data-foo="true">foo</div>
    </if>
    <else>
        <div data-foo="true">foo</div>
        <div data-bar="true">bar</div>
    </else>
</div>