pmn4

// Add type safety to NextApiRequest
type TypedNextApiRequest<Q, B> = Omit<NextApiRequest, 'body' | 'query'> & {
  // make req.query have the keys we expect, but AsQuery will turn the values
  // into strings or string arrays. Partial is there because you never know
  // whether the request will be well-formed
  query: Partial<AsQuery<Q>>;
  // make req.body have the keys and value types we expect, however, know that
  // the data will be deserialized from JSON, so, for example, Dates will be
  // strings. again Partial is there to enforce defensive code
  body: Partial<Deserialized<B>>;

pmn4

// Filtering

export function isFulfilled<T>(
  value: PromiseSettledResult<T>,
  _index?: number,
  _array?: PromiseSettledResult<T>[],
): value is PromiseFulfilledResult<T> {
  return value.status === 'fulfilled';
}