create separate window for setup and then main window

src/services/window.js

@@ -0,0 +1,86 @@
+const {BrowserWindow} = require('electron');
+const path = require('path');
+const url = require("url");
+const port = require('./port');
+const optionService = require('./options');
+const env = require('./env');
+const windowStateKeeper = require('electron-window-state');
+
+// Prevent window being garbage collected
+/** @type {Electron.BrowserWindow} */
+let mainWindow;
+/** @type {Electron.BrowserWindow} */
+let setupWindow;
+
+async function createMainWindow() {
+    const mainWindowState = windowStateKeeper({
+        // default window width & height so it's usable on 1600 * 900 display (including some extra panels etc.)
+        defaultWidth: 1200,
+        defaultHeight: 800
+    });
+
+    mainWindow = new BrowserWindow({
+        x: mainWindowState.x,
+        y: mainWindowState.y,
+        width: mainWindowState.width,
+        height: mainWindowState.height,
+        title: 'Trilium Notes',
+        webPreferences: {
+            nodeIntegration: true
+        },
+        frame: await optionService.getOptionBool('nativeTitleBarVisible'),
+        icon: getIcon()
+    });
+
+    mainWindowState.manage(mainWindow);
+
+    mainWindow.setMenuBarVisibility(false);
+    mainWindow.loadURL('http://127.0.0.1:' + await port);
+    mainWindow.on('closed', () => mainWindow = null);
+
+    mainWindow.webContents.on('new-window', (e, url) => {
+        if (url !== mainWindow.webContents.getURL()) {
+            e.preventDefault();
+            require('electron').shell.openExternal(url);
+        }
+    });
+
+    // prevent drag & drop to navigate away from trilium
+    mainWindow.webContents.on('will-navigate', (ev, targetUrl) => {
+        const parsedUrl = url.parse(targetUrl);
+
+        // we still need to allow internal redirects from setup and migration pages
+        if (!['localhost', '127.0.0.1'].includes(parsedUrl.hostname) || (parsedUrl.path && parsedUrl.path !== '/')) {
+            ev.preventDefault();
+        }
+    });
+}
+
+function getIcon() {
+    return path.join(__dirname, 'images/app-icons/png/256x256' + (env.isDev() ? '-dev' : '') + '.png');
+}
+
+async function createSetupWindow() {
+    setupWindow = new BrowserWindow({
+        width: 800,
+        height: 800,
+        title: 'Trilium Notes Setup',
+        icon: getIcon()
+    });
+
+    setupWindow.setMenuBarVisibility(false);
+    setupWindow.loadURL('http://127.0.0.1:' + await port);
+    setupWindow.on('closed', () => setupWindow = null);
+}
+
+function closeSetupWindow() {
+    if (setupWindow) {
+        setupWindow.close();
+    }
+}
+
+module.exports = {
+    createMainWindow,
+    createSetupWindow,
+    closeSetupWindow
+};