Show uncaughtException as an internal error and quit the app

src/main/CriticalErrorHandler.js

@@ -0,0 +1,64 @@
+const {app, dialog, shell} = require('electron');
+const fs = require('fs');
+const os = require('os');
+const path = require('path');
+
+function createErrorReport(err) {
+  return `Application: ${app.getName()} ${app.getVersion()}\n` +
+         `Platform: ${os.type()} ${os.release()} ${os.arch()}\n` +
+         `${err.stack}`;
+}
+
+function bindWindowToShowMessageBox(win) {
+  if (win && win.isVisible()) {
+    return dialog.showMessageBox.bind(null, win);
+  }
+  return dialog.showMessageBox;
+}
+
+class CriticalErrorHandler {
+  constructor() {
+    this.mainWindow = null;
+  }
+
+  setMainWindow(mainWindow) {
+    this.mainWindow = mainWindow;
+  }
+
+  windowUnresponsiveHandler() {
+    const result = dialog.showMessageBox(this.mainWindow, {
+      type: 'warning',
+      title: `Unresponsive - ${app.getName()}`,
+      message: 'The window is no longer responsive.\nDo you wait until the window becomes responsive again?',
+      buttons: ['No', 'Yes'],
+      defaultId: 0
+    });
+    if (result === 0) {
+      throw new Error('BrowserWindow \'unresponsive\' event has been emitted');
+    }
+  }
+
+  processUncaughtExceptionHandler(err) {
+    const file = path.join(app.getPath('userData'), `uncaughtException-${Date.now()}.txt`);
+    const report = createErrorReport(err);
+    fs.writeFileSync(file, report.replace(new RegExp('\\n', 'g'), os.EOL));
+    fs.writeSync(2, `See "${file}" to report the problem.\n`);
+
+    if (app.isReady()) {
+      const showMessageBox = bindWindowToShowMessageBox(this.mainWindow);
+      const result = showMessageBox({
+        type: 'error',
+        title: `Error - ${app.getName()}`,
+        message: `An internal error has occurred: ${err.message}\nThe application will quit.`,
+        buttons: ['OK', 'Show detail'],
+        defaultId: 0
+      });
+      if (result === 1) {
+        shell.openExternal(file);
+      }
+    }
+    throw err;
+  }
+}
+
+module.exports = CriticalErrorHandler;