Create a standalone build for react application using electron - reactjs

Question

It is my first project in that I'm using electron, I'm dealing with a few problems creating standalone publish from the project.
Here's my electron main.js file:
const path = require("path");
const electron = require("electron");
const isDev = require("electron-is-dev");
// Module to control application life.
const app = electron.app;
// Module to create native browser window.
const BrowserWindow = electron.BrowserWindow;
const url = require("url");
// Keep a global reference of the window object, if you don't, the window will
// be closed automatically when the JavaScript object is garbage collected.
let mainWindow;
function createWindow() {
// Create the browser window.
mainWindow = new BrowserWindow({ show: false });
// cm: open app in fullscreen mode
mainWindow.maximize();
mainWindow.show();
// cm: remove default menu bar
mainWindow.setMenuBarVisibility(false);
if (isDev) {
mainWindow.loadURL(
"http://localhost:3000"
);
} else {
mainWindow.loadFile("./dist/index.js");
}
// Open the DevTools.
mainWindow.webContents.openDevTools();
// Emitted when the window is closed.
mainWindow.on("closed", function () {
// Dereference the window object, usually you would store windows
// in an array if your app supports multi windows, this is the time
// when you should delete the corresponding element.
mainWindow = null;
});
}
// This method will be called when Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.on("ready", createWindow);
// Quit when all windows are closed.
app.on("window-all-closed", function () {
// On OS X it is common for applications and their menu bar
// to stay active until the user quits explicitly with Cmd + Q
if (process.platform !== "darwin") {
app.quit();
}
});
app.on("activate", function () {
// On OS X it's common to re-create a window in the app when the
// dock icon is clicked and there are no other windows open.
if (mainWindow === null) {
createWindow();
}
});
// In this file you can include the rest of your app's specific main process
// code. You can also put them in separate files and require them here.
And my package.json scripts are:
"scripts": {
"start": "react-scripts start",
"build": "react-scripts build",
"test": "react-scripts test",
"eject": "react-scripts eject",
"electron": "electron .",
"package-win": "electron-packager . IranFMCG --overwrite --platform=win32 --arch=ia32 --icon=assets/icons/win/icon.ico --prune=true --out=release-builds --version-string.CompanyName=CE --version-string.FileDescription=CE --version-string.ProductName=\"IranFMCG\"",
},
Everything is fine when the react application is running and I'm using "npm run electron" but after running "npm run package-win" and after that when I'm running exe file I am facing errors.
I think that is because I'm not running react app anymore, but I want to use react build files is it possible?