customer.reducer.ts

export const customerFeatureKey = 'Customer';

export interface State {customers: Customer[]}

export interface CustomerAppState {
  [customerFeatureKey]: State;
}

export const initialState: State = {customers: []};

export const customerReducer = createReducer<State>(
  initialState,
  on(CustomerActions.loaded, (state, { customers }) => ({...state,  customers})),
  on(CustomerActions.added, (state, { customers }) => ({...state, customers})),
  on(CustomerActions.updated, (state, { customers }) => ({...state, customers})),
  on(CustomerActions.removed, (state, { customers }) => ({...state, customers}))
);