/**
 * Client-side WebAuthn implementation
 */
import type { WebAuthnOptions } from '../types/auth';
export declare class WebAuthnClient {
    private options;
    constructor(options: WebAuthnOptions);
    /**
     * Check if WebAuthn is supported in this browser
     */
    static isSupported(): boolean;
    /**
     * Check if the device supports biometric authentication
     */
    static isAvailable(): Promise<boolean>;
    /**
     * Start WebAuthn authentication
     * @param challenge The challenge from the server
     */
    authenticate(challenge: string): Promise<any>;
    /**
     * Register a new WebAuthn credential
     * @param challenge The challenge from the server
     * @param userId The user's ID (we'll use their pubkey)
     * @param userName The user's display name (we'll use their npub)
     */
    register(challenge: string, userId: string, userName: string): Promise<any>;
    private serializeCredential;
    private base64ToBuffer;
    private bufferToBase64;
    private stringToBuffer;
}