VyUI alpha
Composables

i18n composables

Short reference for the internationalization composables Vy UI exports from @vyui/core. See the i18n page for the full story.
Internationalization is only partially built. This page covers what's exported today; see i18n for the complete story, including what's still planned.

From @vyui/core.

installIntlPolyfill

import { installIntlPolyfill } from '@vyui/core'

installIntlPolyfill()

Fills broken or missing Intl.DateTimeFormat / Intl.NumberFormat / Intl.Collator / Intl.Locale on native Lynx's PrimJS engine. English-only, idempotent, and a no-op on platforms with a working Intl (browsers, Lynx web). Call once at app entry, before any component constructs a formatter.

DateFormatter

import { DateFormatter } from '@vyui/core'

const formatter = new DateFormatter('en-US', { month: 'long', year: 'numeric' })
formatter.format(new Date()) // 'January 2026'

A drop-in Intl.DateTimeFormat that avoids the host formatter when it isn't safe to use. Same surface: format, formatToParts, formatRange, resolvedOptions.

useLocale

import { useLocale } from '@vyui/core'

const locale = useLocale() // ComputedRef<string>, defaults to 'en'

The active locale from the nearest ConfigProvider, or 'en' outside one.

useDirection

import { useDirection } from '@vyui/core'

const dir = useDirection() // ComputedRef<'ltr' | 'rtl'>, defaults to 'ltr'

The active dir from the nearest ConfigProvider, or 'ltr' outside one.

Related

useTray

Imperative navigation for an ancestor VyTray from anywhere inside it.

useId

Generate a stable unique id for aria/id/for wiring, or pass one through deterministically.