export interface IAuthenticationHandler {
    tryLogin(username: string, password: string, totp?: string): Promise<boolean | null>;
    needTotp(username: string): Promise<boolean | null>;
}
export declare class AuthenticationLoader {
    private handlers;
    addAuthenticationHandler(authenticationHandler: IAuthenticationHandler): void;
    tryLogin(username: string, password: string, totpCode?: string): Promise<boolean>;
    needTotp(username: string): Promise<boolean>;
}
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