interface Window {
  Nps: (params: INpsSetupParams) => {
    setConfig(key_fields: IObject, tag: IObject, type?: 'popup' | 'modal', endpoint: string = 'https://nps.eduzz.com'): void
  }
}

declare var Nps: Window['Nps'];

interface INpsSetupParams {
  key_fields: IObject<any , any>;
  tag: IObject<any, any>;
  type?: 'popup' | 'modal';
  endpoint?: string;
}

interface IObject<T, S> {
  [key: T] : S;
}