store.js

const electron = require('electron');
const path = require('path');
const fs = require('fs');
class Store {
    
    init(opts)
    {
        const userDataPath = (electron.app || electron.remote.app).getPath('userData');
      // We'll use the `configName` property to set the file name and path.join to bring it all together as a string
      this.path = path.join(userDataPath, opts.configName + '.json');
      
      this.data = parseDataFile(this.path, opts.defaults);
    }
    
    // This will just return the property on the `data` object
    get(key) {
      return this.data[key];
    }
    
    // ...and this will set it
    set(key, val) {
      this.data[key] = val;
      // Wait, I thought using the node.js' synchronous APIs was bad form?
      // We're not writing a server so there's not nearly the same IO demand on the process
      // Also if we used an async API and our app was quit before the asynchronous write had a chance to complete,
      // we might lose that data. Note that in a real app, we would try/catch this.
      fs.writeFileSync(this.path, JSON.stringify(this.data));
    }
  }
  
  function parseDataFile(filePath, defaults) {
    // We'll try/catch it in case the file doesn't exist yet, which will be the case on the first application run.
    // `fs.readFileSync` will return a JSON string which we then parse into a Javascript object
    try {
      return JSON.parse(fs.readFileSync(filePath));
    } catch(error) {
      // if there was some kind of error, return the passed in defaults instead.
      return defaults;
    }
  }
  // expose the class
module.exports = Store;