"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.addBrowser = addBrowser;
/* global WorkerGlobalScope */

function addBrowser(fn) {
  if (typeof WorkerGlobalScope === 'function' && self instanceof WorkerGlobalScope) {
    /**
     * Because killing a worker does directly stop the excution
     * of the code, our only chance is to overwrite the close function
     * which could work some times.
     * @link https://stackoverflow.com/q/72903255/3443137
     */
    var oldClose = self.close.bind(self);
    self.close = function () {
      fn();
      return oldClose();
    };
  } else {
    /**
     * if we are on react-native, there is no window.addEventListener
     * @link https://github.com/pubkey/unload/issues/6
     */
    if (typeof window.addEventListener !== 'function') {
      return;
    }

    /**
     * for normal browser-windows, we use the beforeunload-event
     */
    window.addEventListener('beforeunload', function () {
      fn();
    }, true);

    /**
     * for iframes, we have to use the unload-event
     * @link https://stackoverflow.com/q/47533670/3443137
     */
    window.addEventListener('unload', function () {
      fn();
    }, true);
  }

  /**
   * TODO add fallback for safari-mobile
   * @link https://stackoverflow.com/a/26193516/3443137
   */
}