weer/cjs/error-catchers.js

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

'use strict';

function _interopDefault (ex) { return (ex && (typeof ex === 'object') && 'default' in ex) ? ex['default'] : ex; }

var Utils = _interopDefault(require('./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);

    };

  },

};

module.exports = errorCatchers;