Method _addHandler

lib/winston/rejection-handler.js:151–158

* Helper method to add a transport as an exception handler. * @param {Transport} handler - The transport to add as an exception handler. * @returns {void}

(handler)

   * @returns {void}
   */
  _addHandler(handler) {
    if (!this.handlers.has(handler)) {
      handler.handleRejections = true;
      const wrapper = new RejectionStream(handler);
      this.handlers.set(handler, wrapper);
      this.logger.pipe(wrapper);
    }
  }

  /**
   * Logs all relevant information around the `err` and exits the current