jest-error-handling.js

// Listen to all errors
this.errorEventListener = event => {
  if (this._isSet) {
    global.removeEventListener('error', this.uncaughtErrorHandler); // remove from the queue in case it was previously added
  }
  global.addEventListener('error', this.uncaughtErrorHandler); // should always get appended the end of the list.
  this._isSet = true; // set a flag to check in later error events.
}
// Report uncaught errors.
this.uncaughtErrorHandler = event => {
  if (!event.defaultPrevented) {
    process.emit('uncaughtException', event.error);
    event.preventDefault(); // we still need to prevent because jsdom will print the error to console.error otherwise
  }
};

global.addEventListener('error', this.errorEventListener); // this must be the first handler