react-rest-request/src/reducer.ts

import { ClientResponse } from './client';

export type RequestState<R> = Readonly<{
    data: R | null;
    loading: boolean;
    isCalled: boolean;
    prevHeaders?: Record<string, string>;
    prevVariables?: Record<string, any>;
    prevParams?: Record<string, any>
}>

export type RequestAction<R> =
    | { type: 'call', headers: Record<string, string>, variables: Record<string, any>, params?: Record<string, any> }
    | { type: 'success', response: ClientResponse<R> }
    | { type: 'failure', response: ClientResponse<R> }

export function requestReducer<R>(state: RequestState<R>, action: RequestAction<R>) {
    switch (action.type) {
        case 'call': {
            return {
                ...state,
                loading: true,
                isCalled: true,
                prevHeaders: action.headers,
                prevVariables: action.variables,
                prevParams: action.params,
            };
        }
        case 'success': {
            return {
                ...state,
                loading: false,
                data: action.response.data,
            };
        }
        case 'failure': {
            return {
                ...state,
                loading: false,
                data: null,
                // TODO: need to append errors
            };
        }
    }
}