export const waitFor = function(search :function, callback :function, interval = 500) :void {
  const checkLoop = setInterval(function () {
    let element = search();

    if (typeof element === 'undefined' || element === null) {
      return;
    }

    clearInterval(checkLoop);
    callback(element);
  }, interval);
};

export const waitForElement = function(selector :string, callback :function, interval = 500) :void {
  waitFor(function(){ return document.querySelector(selector); }, callback, interval);
};

export const waitForElements = function(selector :string, callback :function, interval = 500) :void {
  waitFor(function(){ return document.querySelectorAll(selector); }, callback, interval);
};