Find the closest element to the target element

getClosest.js

/**
 * getClosest
 *
 * Find the closest element to the target element
 *
 * @param target - dom element which is the current element
 * @param selector - the element you are looking for
 * @param scope - limit the search to a containing element
 * @returns {*}
 */
export function getClosest(target, selector, scope){
	var matches = (scope || document).querySelectorAll(selector);
	var i;
	var el = target;

	do {
		i = matches.length;
		while (--i >= 0 && matches.item(i) !== el) {};
	} while ((i < 0) && (el = el.parentElement));
	return el;
}

getClosest.ts

export function getClosest(
	target: HTMLElement,
	selector: string,
	scope?: HTMLElement
): null | HTMLElement {
	const matches = (scope || document).querySelectorAll(selector);
	let i;
	let el: null | HTMLElement = target;

	do {
		i = matches.length;
		while (--i >= 0 && matches.item(i) !== el) {}
	} while (i < 0 && (el = el.parentElement ? el.parentElement : null));
	return el;
}