store.js

// save preferences
// https://medium.com/@ccnokes/how-to-store-user-data-in-electron-3ba6bf66bc1e

const electron = require("electron");
const path = require("path");
const fs = require("fs");

class Store {
    constructor(opts) {
        const userDataPath = (electron.app || electron.remote.app).getPath('userData');

        this.path = path.join(userDataPath, `${opts.configName}.json`);
        this.data = parseDataFile(this.path, opts.defaults);
    }

    get(key) {
        return this.data[key];
    }

    set(key, val) {
        this.data[key] = val;
        fs.writeFileSync(this.path, JSON.stringify(this.data));
    }
}

function parseDataFile(filePath, defaults) {
    try {
        return JSON.parse(fs.readFileSync(filePath));
    } catch (error) {
        return defaults;
    }
}

module.exports = Store;