main.js

const { app, BrowserWindow } = require("electron");
let win;

const ipc = require("electron").ipcMain;
function createWindow() {
  // Create the browser window.
  win = new BrowserWindow({
    width: 900,
    height: 600,
    frame: true,
    webPreferences: {
      nodeIntegration: true,
      enableRemoteModule: true,
    },
  });

  // and load the index.html of the app.
  win.loadFile("index.html");

  // Open the DevTools.
  // win.webContents.openDevTools()

  //Quit app when main BrowserWindow Instance is closed
  win.on("closed", function () {
    app.quit();
  });
}

// This method will be called when the Electron has finished
// initialization and is ready to create browser windows.
// Some APIs can only be used after this event occurs.
app.whenReady().then(createWindow);

// Quit when all windows are closed.
app.on("window-all-closed", () => {
  // On macOS 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", () => {
  // On macOS 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 (BrowserWindow.getAllWindows().length === 0) {
    createWindow();
  }
});
ipc.on("update-feature", function (event, arg) {
  win.webContents.send("updateFeatureSelectionList", arg);
});