feat: more fluent vuejs app error handler

frontend/spa/src/errors.js

@@ -0,0 +1,30 @@
+class AppError extends Error {
+  constructor(message, code = 'APP_ERROR') {
+    super(message);
+    this.name = this.constructor.name;
+    this.code = code;
+
+    // важно для наследования Error
+    if (Error.captureStackTrace) {
+      Error.captureStackTrace(this, this.constructor);
+    }
+  }
+}
+
+class MaintenanceError extends AppError {
+  constructor(message = 'Application is under maintenance') {
+    super(message, 'MAINTENANCE');
+  }
+}
+
+class TelegramInitDataError extends AppError {
+  constructor(message = 'Application must be opened inside Telegram') {
+    super(message, 'NO_INIT_DATA');
+  }
+}
+
+export {
+  AppError,
+  MaintenanceError,
+  TelegramInitDataError,
+};