import type { App } from "firebase-admin/app";
import { Auth, TenantAwareAuth } from "firebase-admin/auth";
import type { IAuthOptions } from "./types";
export declare function getAuth(app?: App): Auth;
export declare function getAuth(authOptions?: IAuthOptions): TenantAwareAuth;
/**
 * @function getAuth
 * Get the Auth instance for the default app or a given app.
 * @param {App|IAuthOptions} [param] - The app or options to use.
 * @returns {Auth|TenantAwareAuth} - Auth instance
 */
export default function getAuth(param?: App | IAuthOptions): Auth | TenantAwareAuth;
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