React context state reducer

reducer.js

const UPDATE_STATE = 'update_state';

export default function reducer(state, action) {
    switch (action.type) {
        case UPDATE_STATE:
            return {
                ...state,
                ...action.newData,
            };

        default:
            return state;
    }
}

/**
 * Set data action
 * @param {object} newData
 * @returns {{type: string, newData: Object}}
 */
export function setData(newData) {
    return {
        type: UPDATE_STATE,
        newData,
    };
}