import { SignedAuthToken } from '@socket-mesh/auth';
export interface ClientAuthEngine {
    loadToken(): Promise<null | SignedAuthToken>;
    removeToken(): Promise<null | SignedAuthToken>;
    saveToken(token: SignedAuthToken, options?: {
        [key: string]: any;
    }): Promise<SignedAuthToken>;
}
export interface LocalStorageAuthEngineOptions {
    authTokenName?: string;
}
export declare function isAuthEngine(auth?: ClientAuthEngine | LocalStorageAuthEngineOptions | null): auth is ClientAuthEngine;
export declare class LocalStorageAuthEngine implements ClientAuthEngine {
    private readonly _authTokenName;
    private readonly _internalStorage;
    readonly isLocalStorageEnabled: boolean;
    constructor({ authTokenName }?: LocalStorageAuthEngineOptions);
    private checkLocalStorageEnabled;
    loadToken(): Promise<null | SignedAuthToken>;
    removeToken(): Promise<null | SignedAuthToken>;
    saveToken(token: string): Promise<SignedAuthToken>;
}