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smart-city-digital-twin-mar…/smart-app-city/frontend/node_modules/warn-once/README.md
Eric FELIXINE e30ae8ed09 feat(smart-app): implement complete mobile app MVP
- App.tsx: full navigation (Auth stack + Main tabs with 5 screens)
- Auth: LoginScreen, RegisterScreen, ForgotPasswordScreen
- HomeScreen: dashboard with IoT metrics, weather widget, alerts, quick actions, sensors
- MapScreen: interactive map with layer toggles (6 layers)
- MarketplaceScreen: categories (6), products (5), search
- ChatScreen: AI chat with quick prompts (4), bot responses
- ProfileScreen: user info, stats, menu (9 items), logout
- AlertsScreen: alert list with severity, acknowledge
- SensorsScreen: sensor list with type filters (6 types), search
- ZonesScreen: zone cards with stats
- SettingsScreen: language picker (FR/EN/ES/DE), privacy, about
- Stores: iotStore (sensors, zones, alerts), notificationStore, uiStore + i18n
- Hooks: useSensors, useAlerts, useNotifications, useLocation
- Components: Card, Button, LoadingSpinner, ErrorBoundary, Header
- Services: iotService, notificationService (with axios API client)
- Utils: formatters (temp, AQI, noise, dates), validators (email, password, IBAN)
- Theme: colors.ts with full design system (Blue Ocean palette)
- Ditto: fixed MongoDB connection, new JWT secrets, official gateway image
2026-06-01 18:00:35 -04:00

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Markdown

# warn-once
Print a warning exactly once during development. Suitable for deprecation warnings, warnings for missing setup etc.
## Installation
Open a Terminal in the project root and run:
```sh
npm install warn-once
```
## Usage
The `warnOnce` function accepts a condition as the first argument. If the condition is `true`, then it'll print a warning:
```js
const warnOnce = require('warn-once');
// ...
warnOnce(someCondition, 'This is a warning message');
```
You can call `warnOnce` multiple times, but if the warning was printed already, it'll not be printed again.
The warning is only shown during development, i.e. if `NODE_ENV` is not set to `'production'`.