weer/umd/error-catchers.js

Web Extensions Error Reporter catches global errors, shows notifications and opens error reporter in one click

(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('./utils')) :
  typeof define === 'function' && define.amd ? define(['./utils'], factory) :
  (global.Weer = global.Weer || {}, global.Weer.ErrorCatchers = factory(global.Weer.Utils));
}(this, (function (Utils) { 'use strict';

  Utils = Utils && Utils.hasOwnProperty('default') ? Utils['default'] : Utils;

  var Debug = window.debug || ((/* Logger ID */) => (/* Log message */) => { /* Ignore all */ });

  const debug = Debug('weer:catcher');

  const bgName = 'BG';

  var errorCatchers = {

    installListenersOn({
      hostWindow = window,
      nameForDebug = bgName,
      handleErrorMessage,
    } = {}, cb) {

      const ifInBg = hostWindow === window;
      const bgIsBg = `Background window can't have name other than "${bgName}". `
        + `Default value is "${bgName}".`;
      if (ifInBg) {
        Utils.assert(
          typeof handleErrorMessage === 'function',
          'Messaging from BG window to itself is not allowed,'
          + ' provide message handler for such cases.',
        );
        Utils.assert(nameForDebug === 'BG', bgIsBg);
      } else {
        Utils.assert(nameForDebug !== 'BG', bgIsBg);
      }

      const listener = (errorEvent) => {

        debug(nameForDebug, errorEvent);
        const plainObj = Utils.errorEventToPlainObject(errorEvent);

        const msg = {
          to: 'error-reporter',
          payload: plainObj,
        };

        if (ifInBg) {
          // Because self messaging is not allowed.
          handleErrorMessage(msg);
        } else {
          hostWindow.chrome.runtime.sendMessage(msg);
        }

      };

      const ifUseCapture = true;
      hostWindow.addEventListener('error', listener, ifUseCapture);

      const rejHandler = (event) => {

        event.preventDefault();
        debug(nameForDebug, 'rethrowing promise...');
        throw event.reason;

      };

      hostWindow.addEventListener('unhandledrejection', rejHandler, ifUseCapture);

      if (cb) {
        Utils.timeouted(cb)();
      }

      return function uninstallListeners() {

        hostWindow.removeEventListener('error', listener, ifUseCapture);
        hostWindow.removeEventListener('unhandledrejection', rejHandler, ifUseCapture);

      };

    },

  };

  return errorCatchers;

})));