Insert an element before other one

JavaScript version
const insertBefore = (ele, anotherEle) => anotherEle.parentNode.insertBefore(ele, anotherEle);
// Or
const insertBefore = (ele, anotherEle) => anotherEle.insertAdjacentElement('beforebegin', ele);
TypeScript version
const insertBefore = (ele: Element, anotherEle: Element): Element | null => (anotherEle.parentNode ? anotherEle.parentNode.insertBefore(ele, anotherEle) : null);
// Or
const insertBefore = (ele: Element, anotherEle: Element) => anotherEle.insertAdjacentElement('beforebegin', ele);