| name | hebrew-i18n |
| description | Implement comprehensive Hebrew internationalization (i18n) patterns for web and mobile applications. Use when user asks about Hebrew localization, "beinle'umiyut", i18n for Israeli apps, Hebrew plural forms, Hebrew date formatting, RTL CSS logical properties, bidirectional text handling, React/Vue/Angular/Next.js RTL integration, Tailwind CSS RTL, or next-intl setup. Covers Hebrew pluralization rules, date and number formatting for Israel, RTL-first CSS, Tailwind RTL utilities, and bidi text algorithms. Do NOT use for NLP or content writing (use hebrew-nlp-toolkit or hebrew-content-writer instead). Activate for: בינאום, לוקליזציה, תרגום ממשק, תמיכה בעברית, RTL, ימין לשמאל, פורמט תאריך, צורות רבים, קבצי שפה. |
| license | MIT |
| compatibility | Works with any JavaScript/TypeScript framework. No network required for core patterns. ICU and Intl API used for date/number formatting. |
Hebrew I18n
Instructions
Step 1: Set Up the I18n Framework
React (react-intl / react-i18next):
import { IntlProvider } from 'react-intl';
import heMessages from './locales/he.json';
function App() {
return (
<IntlProvider locale="he" messages={heMessages}>
<div dir="rtl" lang="he">
{/* App content */}
</div>
</IntlProvider>
);
}
Vue (vue-i18n):
import { createI18n } from 'vue-i18n';
const i18n = createI18n({
locale: 'he',
fallbackLocale: 'en',
messages: { he: heMessages, en: enMessages },
});
Next.js App Router (next-intl):
import { NextIntlClientProvider } from 'next-intl';
import { getMessages } from 'next-intl/server';
export default async function LocaleLayout({ children, params }) {
const { locale } = await params;
const messages = await getMessages();
return (
<html lang={locale} dir={locale === 'he' ? 'rtl' : 'ltr'}>
<body>
<NextIntlClientProvider messages={messages}>
{children}
</NextIntlClientProvider>
</body>
</html>
);
}
import createMiddleware from 'next-intl/middleware';
import { routing } from './i18n/routing';
export default createMiddleware(routing);
import { defineRouting } from 'next-intl/routing';
export const routing = defineRouting({
locales: ['he', 'en'],
defaultLocale: 'he',
});
Angular:
"i18n": {
"sourceLocale": "en",
"locales": {
"he": "src/locale/messages.he.xlf"
}
}
Step 2: Hebrew Plural Forms
Hebrew has three plural categories that i18n frameworks must handle:
| Category | Hebrew Term | Count | Example |
|---|
| one (singular) | יחיד | 1 | פריט אחד (one item) |
| two (dual) | זוגי | 2 | שני פריטים (two items) -- uses special dual form |
| other (plural) | רבים | 0, 3+ | 5 פריטים (5 items) |
Note: an older many category (for round numbers like 20 or 100) was removed from Unicode CLDR in version 42 (2022). Modern Hebrew plural rules use only one, two, and other, and round numbers resolve to other. Do not add a many branch; it would be dead code on any current ICU/CLDR runtime.
See references/pluralization.md for complete rules and edge cases.
ICU MessageFormat pattern:
{count, plural,
one {פריט אחד}
two {שני פריטים}
other {{count} פריטים}
}
Common Hebrew plural patterns:
| Singular (יחיד) | Dual (זוגי) | Plural (רבים) | Pattern |
|---|
| יום (day) | יומיים (2 days) | ימים (days) | Irregular dual |
| שעה (hour) | שעתיים (2 hours) | שעות (hours) | Feminine dual -תיים |
| חודש (month) | חודשיים (2 months) | חודשים (months) | Masculine dual -יים |
| שבוע (week) | שבועיים (2 weeks) | שבועות (weeks) | Masculine dual -יים |
| שנה (year) | שנתיים (2 years) | שנים (years) | Irregular dual |
Step 3: Date and Time Formatting
Israeli date format: day before month, never MM/DD/YYYY. Note that Intl.DateTimeFormat('he-IL') renders the short date with dot separators (DD.MM.YYYY), e.g. 04.03.2026; if you specifically need slashes, format the parts manually.
const formatter = new Intl.DateTimeFormat('he-IL', {
year: 'numeric',
month: 'long',
day: 'numeric',
});
const shortFormatter = new Intl.DateTimeFormat('he-IL', {
year: 'numeric',
month: '2-digit',
day: '2-digit',
});
Hebrew day and month names:
| Day | Hebrew | Abbreviation |
|---|
| Sunday | יום ראשון | א׳ |
| Monday | יום שני | ב׳ |
| Tuesday | יום שלישי | ג׳ |
| Wednesday | יום רביעי | ד׳ |
| Thursday | יום חמישי | ה׳ |
| Friday | יום שישי | ו׳ |
| Saturday | שבת | ש׳ |
Israeli business week: Sunday through Thursday (not Monday through Friday).
Hebrew calendar dates: Use libraries like hebcal for Hebrew calendar conversion. Format: day + Hebrew month name (e.g., "ה׳ באדר תשפ״ו").
Step 4: Number and Currency Formatting
const numFormatter = new Intl.NumberFormat('he-IL');
numFormatter.format(1234567.89);
const currFormatter = new Intl.NumberFormat('he-IL', {
style: 'currency',
currency: 'ILS',
});
currFormatter.format(1234.50);
Israeli-specific number patterns:
| Type | Format | Example |
|---|
| Phone (mobile) | 05X-XXXXXXX | 054-1234567 |
| Phone (landline) | 0X-XXXXXXX | 02-6234567 |
| Teudat Zehut (ID) | XXXXXXXXX | 123456782 (9 digits with check digit) |
| Postal code | XXXXXXX | 6100000 (7 digits) |
| Currency | X,XXX.XX ₪ | 1,234.50 ₪ |
Step 5: RTL CSS with Logical Properties
Always use CSS logical properties for i18n-ready layouts:
html[lang="he"] {
direction: rtl;
}
.card {
margin-inline-start: 1rem;
padding-inline-end: 0.5rem;
border-inline-start: 3px solid blue;
text-align: start;
}
.nav {
display: flex;
gap: 1rem;
}
Tailwind CSS RTL (v3.3+, including v4):
Tailwind provides logical property utilities and RTL variants:
<div class="ms-4 me-2 ps-3 pe-1 text-start">
</div>
<div class="ltr:ml-4 rtl:mr-4 ltr:text-left rtl:text-right">
</div>
| Physical (avoid) | Logical (prefer) | RTL behavior |
|---|
ml-4 | ms-4 | Right margin in RTL |
mr-4 | me-4 | Left margin in RTL |
pl-4 | ps-4 | Right padding in RTL |
pr-4 | pe-4 | Left padding in RTL |
text-left | text-start | Right-aligned in RTL |
text-right | text-end | Left-aligned in RTL |
rounded-l-lg | rounded-s-lg | Right corners in RTL |
border-r-2 | border-e-2 | Left border in RTL |
Step 6: Bidirectional Text Handling
See references/bidi.md for detailed patterns and edge cases.
<p dir="rtl">
הזמנה מספר <span dir="ltr">ORD-12345</span> אושרה
</p>
<p dir="rtl">
המשתמש <bdi>JohnDoe123</bdi> נרשם
</p>
Common bidi scenarios in Israeli apps:
| Content Type | Direction | Handling |
|---|
| Hebrew text | RTL | Default, no special handling |
| English text in Hebrew | LTR | Wrap in dir="ltr" span |
| Phone numbers | LTR | Wrap in dir="ltr" or <bdo> |
| URLs and emails | LTR | Wrap in dir="ltr" span |
| Mixed Hebrew + code | Both | Use unicode-bidi: isolate |
| Currency amounts | LTR numbers + RTL symbol | Use Intl.NumberFormat |
Step 7: Framework-Specific RTL Integration
Next.js App Router with Tailwind:
export default async function LocaleLayout({ children, params }) {
const { locale } = await params;
return (
<html lang={locale} dir={locale === 'he' ? 'rtl' : 'ltr'}>
<body className="font-sans">
{/* Tailwind logical utilities auto-flip based on dir attribute */}
<main className="ms-4 me-4 text-start">{children}</main>
</body>
</html>
);
}
export function NavBar() {
return (
<nav className="flex items-center gap-4">
<button className="ltr:rotate-0 rtl:rotate-180">
<ChevronRight /> {/* Flips to point left in RTL */}
</button>
</nav>
);
}
Vue with Vuetify:
import { createVuetify } from 'vuetify';
const vuetify = createVuetify({
locale: {
locale: 'he',
fallback: 'en',
rtl: { he: true },
},
});
Angular Material:
import { BidiModule } from '@angular/cdk/bidi';
@NgModule({
imports: [BidiModule],
})
export class AppModule {}
Examples
Example 1: Add Hebrew to Existing React App
User says: "I need to add Hebrew language support to my React app"
Result: Set up react-i18next with Hebrew locale, create he.json message file, configure plural rules, add RTL wrapper with dir="rtl", replace hardcoded strings with translation keys, and handle bidi text for mixed content.
Example 2: Format Israeli Dates and Currency
User says: "How do I format dates and prices for Israeli users?"
Result: Use Intl.DateTimeFormat with he-IL locale for Israeli-format dates (day before month; the short form renders dot-separated, DD.MM.YYYY), Intl.NumberFormat with ILS currency for shekel formatting, and ensure numbers display correctly in RTL context.
Example 3: Fix Bidirectional Text Issues
User says: "Phone numbers and English text look wrong in my Hebrew UI"
Result: Wrap phone numbers in dir="ltr" spans, isolate English content with unicode-bidi: isolate, use bdi element for user-generated content, and test with mixed Hebrew/English strings.
Example 4: Hebrew Plural Forms
User says: "My Hebrew translations show wrong plural forms"
Result: Implement ICU MessageFormat with three categories (one/two/other), handle dual forms for time units, and configure i18n framework plural rules for Hebrew locale.
Example 5: Add Hebrew to Next.js App Router
User says: "I want to add Hebrew and English support to my Next.js App Router project"
Result: Install next-intl, create [locale] route segment, configure middleware for locale detection, set dir="rtl" on <html> for Hebrew locale, create he.json and en.json message files with ICU plural syntax, and use Tailwind logical utilities (ms-*, me-*, text-start) for RTL-ready styles.
Bundled Resources
Scripts
scripts/generate_i18n.py: Generate Hebrew i18n message files. Scaffolds translation JSON structure, extracts Hebrew plural form templates, and produces locale files for react-intl, vue-i18n, and next-intl. Run: python scripts/generate_i18n.py --help
References
references/pluralization.md: Complete Hebrew pluralization rules with singular, dual, and plural forms for common word categories (time, quantities, objects), ICU MessageFormat patterns, and edge cases for Hebrew number agreement.references/bidi.md: Bidirectional text handling patterns for Hebrew applications. Unicode bidi algorithm overview, HTML dir attribute usage, CSS unicode-bidi properties, framework-specific bidi solutions, and common pitfalls with mixed Hebrew/English/number content.
Gotchas
- Agents may set
dir="rtl" only on the body element, but RTL direction must be set at the <html> level to properly affect scroll bars, default text alignment, and CSS logical properties.
- Hebrew plural forms are complex: there are singular, dual (for some nouns), and plural forms. Agents may implement simple English-style singular/plural (1 vs. many) and miss the dual form (e.g., yomayim = 2 days).
- i18n keys for Hebrew should not use the English text as the key (e.g.,
t('Submit')) because Hebrew translations can be much shorter or longer, breaking layouts. Use semantic keys (e.g., t('form.submit')).
- Agents often forget to reverse icon positions in RTL: arrows, chevrons, and progress indicators should mirror horizontally. A "next" arrow should point left in Hebrew UI, not right.
- In Tailwind CSS,
space-x-* utilities do not auto-reverse in RTL. Use gap-* with flex/grid instead, or add space-x-reverse when RTL is active. Similarly, prefer logical utilities (ms-*, me-*, ps-*, pe-*) over physical ones (ml-*, mr-*, pl-*, pr-*).
Troubleshooting
Error: "Plural forms not matching Hebrew grammar"
Cause: i18n framework not configured for Hebrew three-category plural rules
Solution: Hebrew uses one/two/other (not just one/other like English). Ensure your framework is configured with CLDR Hebrew plural rules. In react-intl, use ICU MessageFormat with the two category.
Error: "Date showing MM/DD/YYYY instead of DD/MM/YYYY"
Cause: Using en-US locale instead of he-IL for date formatting
Solution: Use new Intl.DateTimeFormat('he-IL') or configure your date library with the he-IL locale. Never assume American date format for Israeli users.
Error: "Numbers appear reversed in RTL context"
Cause: RTL direction affecting digit display order
Solution: Numbers in Hebrew are always LTR. Use dir="ltr" on numeric content or rely on the Unicode bidi algorithm which handles digits correctly by default. The issue is usually with surrounding punctuation, not the digits themselves.
