/**
 * Module Dependencies
 */

try {
  var matches = require('matches-selector')
} catch (err) {
  var matches = require('component-matches-selector')
}

/**
 * Export `closest`
 */

module.exports = closest

/**
 * Closest
 *
 * @param {Element} el
 * @param {String} selector
 * @param {Element} scope (optional)
 */

function closest (el, selector, scope) {
  scope = scope || document.documentElement;

  // walk up the dom
  while (el && el !== scope) {
    if (matches(el, selector)) return el;
    el = el.parentNode;
  }

  // check scope for match
  return matches(el, selector) ? el : null;
}