app/composables/layout/useRedirectToLogin.ts

import {navigateTo, useRuntimeConfig} from "#app";
import Url from "~/services/utils/url";

export const useRedirectToLogin = () => {
    const runtimeConfig = useRuntimeConfig()

    return () => {
        if (!runtimeConfig.baseUrlAdminLegacy) {
            throw new Error('Configuration error : no redirection target')
        }
        navigateTo(Url.join(runtimeConfig.baseUrlAdminLegacy, '#/login'), {external: true})
    }
}