@daveyplate/better-auth-ui/src/hooks/use-lang.ts

Plug & play shadcn/ui components for better-auth

import { useEffect, useState } from "react"

export function useLang() {
    const [lang, setLang] = useState<string>()

    useEffect(() => {
        const checkLang = () => {
            const currentLang = document.documentElement.getAttribute("lang")
            setLang(currentLang ?? undefined)
        }

        // Initial check
        checkLang()

        // Listen for changes to lang attribute on html tag
        const observer = new MutationObserver((mutations) => {
            for (const mutation of mutations) {
                if (mutation.attributeName === "lang") {
                    checkLang()
                }
            }
        })

        observer.observe(document.documentElement, { attributes: true })

        return () => {
            observer.disconnect()
        }
    }, [])

    return { lang }
}