import { useTranslation } from 'react-i18next';

function MyComponent() {
  const { t } = useTranslation(['patients', 'common']);
  
  return (
    <div>
      <h1>{t('patients:title')}</h1>
      <button>{t('common:actions.save')}</button>
    </div>
  );
}

import { useFormatting } from '@/hooks';

function PriceDisplay({ amount, items }) {
  const { formatILS, formatList, formatOrdinal } = useFormatting();
  
  return (
    <div>
      <p>Price: {formatILS(amount)}</p>        {/* ₪1,500.00 */}
      <p>Items: {formatList(items)}</p>        {/* "a, b, and c" */}
      <p>Position: {formatOrdinal(3)}</p>      {/* "3rd" */}
    </div>
  );
}

import { formatDate, formatDateShort, calculateWaitTime } from '@/lib/dates';

const date = formatDate(appointment.date);    // "Jan 6, 2026"
const waitTime = calculateWaitTime('09:30');  // "15 min"

{
  "patients": "{count, plural, =0 {No patients} one {# patient} other {# patients}}"
}

t('patients', { count: 5 })  // → "5 patients"

import { Trans } from 'react-i18next';

<Trans
  i18nKey="richText.welcome"
  values={{ name: userName }}
  components={{ strong: <strong /> }}
/>

frontend/src/i18n/locales/
├── en/
│   ├── common.json      # Shared: actions, status, time
│   ├── patients.json    # Patient-related strings
│   ├── dashboard.json   # Dashboard strings
│   ├── owner.json       # Owner portal strings
│   └── invoices.json    # Invoice strings
└── he/
    └── (same structure)

// ❌ NEVER hardcode strings
<h1>מטופלים</h1>                    // Use t('patients:title')
<button>Save</button>               // Use t('common:actions.save')

// ❌ NEVER use .join() for lists
items.join(', ')                    // Use formatList(items)

// ❌ NEVER hardcode currency
"₪" + price                         // Use formatILS(price)

// ❌ NEVER use new Date() for formatting
new Date().toLocaleDateString()     // Use formatDate() from @/lib/dates

// ❌ NEVER use inline plural logic
count === 1 ? 'item' : 'items'      // Use ICU MessageFormat

// ❌ NEVER leave console.log in production
console.log('debug')                // Remove before commit

// ❌ NEVER use dangerouslySetInnerHTML for i18n
dangerouslySetInnerHTML             // Use <Trans> component