/**
 * Convert from a Base64URL-encoded string to an Array Buffer. Best used when converting a
 * credential ID from a JSON string to an ArrayBuffer, like in allowCredentials or
 * excludeCredentials
 *
 * Helper method to compliment `bufferToBase64URLString`
 */
export declare function base64URLStringToBuffer(base64URLString: string): ArrayBuffer;
/**
 * Convert the given array buffer into a Base64URL-encoded string. Ideal for converting various
 * credential response ArrayBuffers to string for sending back to the server as JSON.
 *
 * Helper method to compliment `base64URLStringToBuffer`
 */
export declare function bufferToBase64URLString(buffer: ArrayBuffer): string;
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