import { IAuthenticationHandler } from "./index.js";
export interface LdapAuthenticationConfiguration {
    ldapUrl: string;
    bindDnField: string;
    bindBase: string;
    usernameField?: string | null;
    ldapFilter?: string | null;
    totpField?: string | null;
}
export declare class LdapAuthenticationHandler implements IAuthenticationHandler {
    private configuration;
    constructor(configuration: LdapAuthenticationConfiguration);
    private fieldToString;
    private tryBind;
    tryLogin(username: string, password: string, totp?: string): Promise<boolean | null>;
    needTotp(username: string, password: string): Promise<boolean | null>;
}
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