const Store = require('electron-store');

const schema = {
    foo: {
        type: 'number',
        default: 14
    },
    bar: {
        type: 'object',
        properties: {
            a: {
                type: 'number',
                default: 5
            }
        }
    }
}

const store = new Store({schema: schema});

console.log(store.get('foo'));
//=> 14
console.log(store.get('bar.a'));
//=> Cannot get property 'a' of undefined (I've paraphrased the error message)