handle(...args) {
    args.forEach(arg => {
      if (Array.isArray(arg)) {
        return arg.forEach(handler => this._addHandler(handler));
      }

      this._addHandler(arg);
    });

    if (!this.catcher) {
      this.catcher = this._uncaughtException.bind(this);
      process.on('uncaughtException', this.catcher);
    }
  }
Handles `uncaughtException` events for the current process by adding any
handlers passed in.
@returns {undefined}