import React from "react" ; export const initialState = { progress : 0 , stopProgress : false , } ; type ActionType = { type : string ; payload : any ; } ; export const PROGRESS = "PROGRESS" , STOP_PROGRESS = "STOP_PROGRESS" ; export const progressReducer = ( state , action ) => { switch ( action . type ) { case PROGRESS : return { ... state , progress : action . payload } ; case STOP_PROGRESS : return { ... state , stopProgress : action . payload } ; } } ;