MyCrypto/common/reducers/config.js

import {
    CONFIG_LANGUAGE_CHANGE,
    CONFIG_NODE_CHANGE
} from 'actions/config';
import {languages, nodeList} from '../config/data';

const initialState = {
    languageSelection: languages[0],
    nodeSelection: nodeList[0]
}

export function config(state = initialState, action) {
    switch (action.type) {
        case CONFIG_LANGUAGE_CHANGE: {
            return {
                ...state,
                languageSelection: action.value
            }
        }
        case CONFIG_NODE_CHANGE: {
            return {
                ...state,
                nodeSelection: action.value
            }
        }
        default:
            return state
    }
}