export type StitchAppClient = {
    auth: {
        refreshCustomData?(): Promise<void>;
        refreshAccessToken?(): Promise<void>;
        authInfo?: {
            accessToken?: string;
        };
        isLoggedIn: boolean;
    };
};
export type RealmAppClient = {
    authenticator: Record<string, any>;
    currentUser: {
        accessToken?: string;
        refreshCustomData?(): Promise<void>;
        isLoggedIn: boolean;
    };
};
type AppClient = StitchAppClient | RealmAppClient;
/**
 * A helper utility to support using [Realm Authentication](https://www.mongodb.com/docs/realm/) with MongoDB Charts with two npm packages:
 *
 * Using "mongodb-stitch-browser-sdk"
 *
 * ```js
 * const client = Stitch.initializeDefaultAppClient('<your-client-app-id>');
 * client.auth.loginWithCredential(...)
 *
 * const sdk = new ChartsEmbedSDK({
 *   getUserToken: () => getRealmUserToken(client)
 * })
 * ```
 *
 * or using "realm-web"
 *
 * ```js
 * const client = new Realm.App({id: '<your-client-app-id>'});
 * client.logIn(...)
 *
 * const sdk = new ChartsEmbedSDK({
 *   getUserToken: () => getRealmUserToken(client)
 * })
 * ```
 *
 */
export declare function getRealmUserToken(appClient: AppClient): Promise<string>;
export {};