penpal/es5/parent/monitorIframeRemoval.js

A promise-based library for communicating with iframes via postMessage.

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;
const CHECK_IFRAME_IN_DOC_INTERVAL = 60000;
/**
 * Monitors for iframe removal and destroys connection if iframe
 * is found to have been removed from DOM. This is to prevent memory
 * leaks when the iframe is removed from the document and the consumer
 * hasn't called destroy(). Without this, event listeners attached to
 * the window would stick around and since the event handlers have a
 * reference to the iframe in their closures, the iframe would stick
 * around too.
 */

var _default = (iframe, destructor) => {
  const {
    destroy,
    onDestroy
  } = destructor;
  const checkIframeInDocIntervalId = setInterval(() => {
    if (!iframe.isConnected) {
      clearInterval(checkIframeInDocIntervalId);
      destroy();
    }
  }, CHECK_IFRAME_IN_DOC_INTERVAL);
  onDestroy(() => {
    clearInterval(checkIframeInDocIntervalId);
  });
};

exports.default = _default;