React Alert

This skill defines the standard approach for displaying alerts, notifications, and user feedback in this project. All alerts MUST use toast notifications from the sonner library — never native browser alerts.

Setup

The sonner package is already installed in this project. The <Toaster> provider is already mounted in src/App.tsx:

import { Toaster } from 'sonner';

// Inside the App component JSX:
<Toaster position="bottom-right" richColors />

No additional setup is needed. Just import toast from sonner and call it.

Rules

1. Always use toast from sonner for any user-facing alert, notification, or feedback message.
2. Never use window.alert() — use toast() or toast.error() instead.
3. Never use window.confirm() — use the Modal component (see react-modal skill) for confirmation dialogs, with toast for the resulting success/error feedback.
4. Never use window.prompt() — use the Modal component with a form input instead.
5. Never use console.log() as a substitute for user feedback — if the user should see it, use a toast.
6. Never create custom alert/notification components (banners, snackbars, inline alerts) for transient feedback. The toast system already handles this with consistent styling and auto-dismiss behavior.

Toast Types

Use the appropriate toast variant to match the nature of the message:

import { toast } from 'sonner';

// Success — operation completed successfully
toast.success('Profile updated successfully!');

// Error — something went wrong
toast.error('Failed to save changes. Please try again.');

// Warning — caution or important notice
toast.warning('Your session will expire in 5 minutes.');

// Info — neutral informational message
toast.info('New updates are available.');

// Default — generic notification (no icon/color)
toast('Something happened.');

// Loading — for async operations with follow-up
toast.loading('Saving changes...');

Usage Patterns

Basic feedback after an action

import { toast } from 'sonner';

const handleSave = async () => {
  try {
    await saveData();
    toast.success('Changes saved successfully!');
  } catch (error) {
    toast.error(error.message || 'Failed to save changes.');
  }
};

Promise-based toast (loading → success/error)

For async operations where you want to show a loading state that resolves:

import { toast } from 'sonner';

const handleDelete = () => {
  toast.promise(deleteItem(id), {
    loading: 'Deleting item...',
    success: 'Item deleted successfully!',
    error: 'Failed to delete item.',
  });
};

Toast with action button

When the user might want to undo or take a follow-up action:

import { toast } from 'sonner';

toast('Item archived.', {
  action: {
    label: 'Undo',
    onClick: () => restoreItem(id),
  },
});

Toast with custom duration

Default auto-dismiss is usually fine, but you can customize:

import { toast } from 'sonner';

// Stay longer for important messages (duration in ms)
toast.warning('Unsaved changes will be lost.', { duration: 8000 });

// Persistent toast that requires manual dismiss
toast.error('Connection lost. Check your internet.', { duration: Infinity });

Toast with description

For messages that need additional context:

import { toast } from 'sonner';

toast.success('User invited', {
  description: 'An invitation email has been sent to john@example.com.',
});

Message Guidelines

• Keep toast messages short and clear (one sentence).
• Use past tense for completed actions: "Profile updated successfully!" not "Profile has been updated."
• Use imperative or present tense for errors and instructions: "Failed to save. Please try again."
• Don't include technical details in user-facing messages — log those to console.error() separately.
• Always provide a fallback message when the error object might not have a .message:

  toast.error(error.message || 'An unexpected error occurred.');
  

Existing Conventions

This project already uses toast from sonner in several pages. Follow the same pattern:

• Success on completed action: toast.success('Login successful! Welcome back.')
• Error with message fallback: toast.error(error.message || 'Login failed. Please try again.')
• Callbacks from nauth-react components: Pass onSuccess / onError handlers that call toast.success() / toast.error().