Function reducer

packages/react-async/src/reducer.ts:73–118

(state: ReducerAsyncState<T>, action: AsyncAction<T>)

  } as ReducerAsyncState<T>)

export const reducer = <T>(state: ReducerAsyncState<T>, action: AsyncAction<T>) => {
  switch (action.type) {
    case ActionTypes.start:
      return {
        ...state,
        startedAt: new Date(),
        finishedAt: undefined,
        ...getStatusProps(StatusTypes.pending),
        counter: action.meta.counter,
        promise: action.meta.promise,
      } as AsyncPending<T, ReducerBaseState<T>>
    case ActionTypes.cancel:
      return {
        ...state,
        startedAt: undefined,
        finishedAt: undefined,
        ...getStatusProps(getIdleStatus(state.error || state.data)),
        counter: action.meta.counter,
        promise: action.meta.promise,
      } as
        | AsyncInitial<T, ReducerBaseState<T>>
        | AsyncFulfilled<T, ReducerBaseState<T>>
        | AsyncRejected<T, ReducerBaseState<T>>
    case ActionTypes.fulfill:
      return {
        ...state,
        data: action.payload,
        value: action.payload,
        error: undefined,
        finishedAt: new Date(),
        ...getStatusProps(StatusTypes.fulfilled),
        promise: action.meta.promise,
      } as AsyncFulfilled<T, ReducerBaseState<T>>
    case ActionTypes.reject:
      return {
        ...state,
        error: action.payload,
        value: action.payload,
        finishedAt: new Date(),
        ...getStatusProps(StatusTypes.rejected),
        promise: action.meta.promise,
      } as AsyncRejected<T, ReducerBaseState<T>>
    default:
      return state
  }
}

export const dispatchMiddleware = <T>(
  dispatch: (action: AsyncAction<T>, ...args: any[]) => void