SOURCE

let dom = new Proxy({}, {
    get(target, key) {
        return function (attrs = {}, ...children) {
            let el = document.createElement(key)

            for (let attr of Object.keys(attrs)) {
                el.setAttribute(attr, attrs[attr])
            }

            for (let child of children) {
                if (typeof child === 'string') {
                    child = document.createTextNode(child)
                }
                el.appendChild(child)
            }
            return el
        }
    }
})

let rec = dom.div({ id: 'demo' },
    'Hello World',
    dom.a({ href: '#' }, 'link'),
    dom.ul({ id: 'list' },
        dom.li({}, 'item1'),
        dom.li({}, 'item2')
    )
)


document.querySelector('#app').appendChild(rec)