fransstudio2

export function addClickOutside(el: HTMLElement, fun: Function) {
  const elWithFun: HTMLElement & {
    clickOutsideFun?: (this: Document, ev: MouseEvent) => any;
  } = el;
  elWithFun.clickOutsideFun = function (this: Document, event: MouseEvent) {
    if (!el.contains(event.target as Node)) {
      fun(event);
    }
    return true as any;
  };

fransstudio2

    let containerClass = "containerClass";
    let insideContainer = false;
    let elem = event.target;
    while (elem) {
      if (elem.classList && elem.classList.contains(containerClass)) {
        insideContainer = true;
        break;
      }
      elem = elem.parentNode;
    }