Persist Language in a client-side cookie using js-cookie library

setLanguageCookie.ts

import Cookies from "js-cookie"

const languageCookieKey = "{your-webApp-name}-language"
const cookieOptions = {
    // ...
    // Only set secure if we are running on an https environment.
    // secure: true => force cookie to be only readable by https requests.
    secure: window?.location?.protocol === "https:",
}

export function setLanguageCookie(language) {
    // Save language in cookie on the client side - only single browser support required
    Cookies.set(languageCookieKey, language, cookieOptions)

}