export interface PkceDto {
    codeVerifier: string;
    codeChallenge: string;
}
/**
 * Generates a PKCE (Proof Key for Code Exchange) pair consisting of a code verifier and a code challenge.
 *
 * @param {number} [length=86] - The desired length of the code verifier. Defaults to 86 if not specified.
 * @return {Promise<{codeVerifier: string, codeChallenge: string}>} A promise that resolves to an object containing the code verifier and code challenge.
 */
export declare function generatePkce(length?: number): Promise<PkceDto>;
/**
 * Generates a random string state encoded in Base64 URL format.
 * Optionally allows truncation of the generated state to a specific length.
 *
 * @param {number} [bytes=32] - The number of random bytes to generate.
 * @param {number} [targetLen] - The desired length of the output string. If not specified, the full generated string is returned.
 * @return {string} - A randomly generated Base64 URL-encoded string. If targetLen is provided, returns a substring of the specified length.
 */
export declare function generateState(bytes?: number, targetLen?: number): string;
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