electron.js

const electron = require('electron');

const app = electron.app;

const BrowserWindow = electron.BrowserWindow;

const path = require('path');
const url = require('url');

let mainWindow;

function createWindow(){

    const startUrl = process.env.ELECTRON_START_URLL || url.format({
        pathname: path.join(__dirname, '/../build/index.html'),
        protocol: 'file:',
        slashes: true
    });

    mainWindow = new BrowserWindow({width:1920,height:1000});

    mainWindow.loadURL(startUrl);

    // mainWindow.webContents.openDevTools();

    mainWindow.on('closed',()=>{
        mainWindow = null;
    })
}

app.on('ready',createWindow);

app.on('window-all-closed',()=>{
    if(process.platform !== 'darwin'){
        app.quit();
    }
})

app.on('activate',()=>{
    if(mainWindow === null){
        createWindow()
    }
})