metamask-extension/ui/app/ducks/alerts/invalid-custom-network.js

import { createSlice } from '@reduxjs/toolkit';

import { ALERT_TYPES } from '../../../../shared/constants/alerts';
import { ALERT_STATE } from './enums';

// Constants

const name = ALERT_TYPES.invalidCustomNetwork;

const initialState = {
  state: ALERT_STATE.CLOSED,
  networkName: '',
};

// Slice (reducer plus auto-generated actions and action creators)

const slice = createSlice({
  name,
  initialState,
  reducers: {
    openAlert: (state, action) => {
      state.state = ALERT_STATE.OPEN;
      state.networkName = action.payload;
    },
    dismissAlert: (state) => {
      state.state = ALERT_STATE.CLOSED;
      state.networkName = '';
    },
  },
});

const { actions, reducer } = slice;

export default reducer;

// Selectors

export const getAlertState = (state) => state[name].state;

export const getNetworkName = (state) => state[name].networkName;

export const alertIsOpen = (state) => state[name].state !== ALERT_STATE.CLOSED;

// Actions / action-creators

const { openAlert, dismissAlert } = actions;

export { openAlert, dismissAlert };