/**
 * Utility functions for base64url encoding/decoding used by React Native passkey authentication.
 *
 * The react-native-passkey library uses base64url strings, while the browser WebAuthn API
 * uses raw ArrayBuffers. These utilities handle the conversion between formats.
 */
/**
 * Converts a Uint8Array to a base64url-encoded string.
 * Base64url uses '-' and '_' instead of '+' and '/', and omits padding '='.
 */
export declare function uint8ArrayToBase64Url(bytes: Uint8Array): string;
/**
 * Converts a base64url-encoded string to a Uint8Array.
 */
export declare function base64UrlToUint8Array(base64url: string): Uint8Array;
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